Added docker support

2024-02-24 05:43:31 +00:00 · 2018-10-30 14:15:49 +08:00
parent 97e7e792f8
commit 84b0c2e861
108 changed files with 240 additions and 16 deletions
--- a/app/YtManagerApp/init.py
+++ b/app/YtManagerApp/init.py
--- a/app/YtManagerApp/admin.py
+++ b/app/YtManagerApp/admin.py
@@ -0,0 +1,6 @@
+from django.contrib import admin
+from .models import SubscriptionFolder, Subscription, Video
+
+admin.site.register(SubscriptionFolder)
+admin.site.register(Subscription)
+admin.site.register(Video)
--- a/app/YtManagerApp/appconfig.py
+++ b/app/YtManagerApp/appconfig.py
@@ -0,0 +1,123 @@
+import logging
+import os
+import os.path
+from collections import ChainMap
+from configparser import ConfigParser
+from shutil import copyfile
+from typing import Optional, Any
+
+from django.conf import settings as dj_settings
+from django.contrib.auth.models import User
+
+from .models import UserSettings, Subscription
+from .utils.extended_interpolation_with_env import ExtendedInterpolatorWithEnv
+
+_CONFIG_DIR = os.path.join(dj_settings.BASE_DIR, 'config')
+_LOG_FILE = 'log.log'
+_LOG_PATH = os.path.join(_CONFIG_DIR, _LOG_FILE)
+_LOG_FORMAT = '%(asctime)s|%(process)d|%(thread)d|%(name)s|%(filename)s|%(lineno)d|%(levelname)s|%(message)s'
+
+
+class AppSettings(ConfigParser):
+    _DEFAULT_INTERPOLATION = ExtendedInterpolatorWithEnv()
+    __DEFAULTS_FILE = 'defaults.ini'
+    __SETTINGS_FILE = 'config.ini'
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(allow_no_value=True, *args, **kwargs)
+        self.__defaults_path = os.path.join(_CONFIG_DIR, AppSettings.__DEFAULTS_FILE)
+        self.__settings_path = os.path.join(_CONFIG_DIR, AppSettings.__SETTINGS_FILE)
+
+    def initialize(self):
+        self.read([self.__defaults_path, self.__settings_path])
+
+    def save(self):
+        if os.path.exists(self.__settings_path):
+            # Create a backup
+            copyfile(self.__settings_path, self.__settings_path + ".backup")
+        else:
+            # Ensure directory exists
+            settings_dir = os.path.dirname(self.__settings_path)
+            os.makedirs(settings_dir, exist_ok=True)
+
+        with open(self.__settings_path, 'w') as f:
+            self.write(f)
+
+    def __get_combined_dict(self, vars: Optional[Any], sub: Optional[Subscription], user: Optional[User]) -> ChainMap:
+        vars_dict = {}
+        sub_overloads_dict = {}
+        user_settings_dict = {}
+
+        if vars is not None:
+            vars_dict = vars
+
+        if sub is not None:
+            sub_overloads_dict = sub.get_overloads_dict()
+
+        if user is not None:
+            user_settings = UserSettings.find_by_user(user)
+            if user_settings is not None:
+                user_settings_dict = user_settings.to_dict()
+
+        return ChainMap(vars_dict, sub_overloads_dict, user_settings_dict)
+
+    def get_user(self, user: User, section: str, option: Any, vars=None, fallback=object()) -> str:
+        return super().get(section, option,
+                           fallback=fallback,
+                           vars=self.__get_combined_dict(vars, None, user))
+
+    def getboolean_user(self, user: User, section: str, option: Any, vars=None, fallback=object()) -> bool:
+        return super().getboolean(section, option,
+                                  fallback=fallback,
+                                  vars=self.__get_combined_dict(vars, None, user))
+
+    def getint_user(self, user: User, section: str, option: Any, vars=None, fallback=object()) -> int:
+        return super().getint(section, option,
+                              fallback=fallback,
+                              vars=self.__get_combined_dict(vars, None, user))
+
+    def getfloat_user(self, user: User, section: str, option: Any, vars=None, fallback=object()) -> float:
+        return super().getfloat(section, option,
+                                fallback=fallback,
+                                vars=self.__get_combined_dict(vars, None, user))
+
+    def get_sub(self, sub: Subscription, section: str, option: Any, vars=None, fallback=object()) -> str:
+        return super().get(section, option,
+                           fallback=fallback,
+                           vars=self.__get_combined_dict(vars, sub, sub.user))
+
+    def getboolean_sub(self, sub: Subscription, section: str, option: Any, vars=None, fallback=object()) -> bool:
+        return super().getboolean(section, option,
+                                  fallback=fallback,
+                                  vars=self.__get_combined_dict(vars, sub, sub.user))
+
+    def getint_sub(self, sub: Subscription, section: str, option: Any, vars=None, fallback=object()) -> int:
+        return super().getint(section, option,
+                              fallback=fallback,
+                              vars=self.__get_combined_dict(vars, sub, sub.user))
+
+    def getfloat_sub(self, sub: Subscription, section: str, option: Any, vars=None, fallback=object()) -> float:
+        return super().getfloat(section, option,
+                                fallback=fallback,
+                                vars=self.__get_combined_dict(vars, sub, sub.user))
+
+
+settings = AppSettings()
+
+
+def initialize_app_config():
+    settings.initialize()
+    __initialize_logger()
+    logging.info('Application started!')
+
+
+def __initialize_logger():
+    log_level_str = settings.get('global', 'LogLevel', fallback='INFO')
+
+    try:
+        log_level = getattr(logging, log_level_str)
+        logging.basicConfig(filename=_LOG_PATH, level=log_level, format=_LOG_FORMAT)
+
+    except AttributeError:
+        logging.basicConfig(filename=_LOG_PATH, level=logging.INFO, format=_LOG_FORMAT)
+        logging.warning('Invalid log level "%s" in config file.', log_level_str)
--- a/app/YtManagerApp/appmain.py
+++ b/app/YtManagerApp/appmain.py
@@ -0,0 +1,11 @@
+from .appconfig import initialize_app_config
+from .scheduler import initialize_scheduler
+from .management.jobs.synchronize import schedule_synchronize_global
+import logging
+
+
+def main():
+    initialize_app_config()
+    initialize_scheduler()
+    schedule_synchronize_global()
+    logging.info('Initialization complete.')
--- a/app/YtManagerApp/apps.py
+++ b/app/YtManagerApp/apps.py
@@ -0,0 +1,11 @@
+from django.apps import AppConfig
+import os
+
+
+class YtManagerAppConfig(AppConfig):
+    name = 'YtManagerApp'
+
+    def ready(self):
+        # Run server using --noreload to avoid having the scheduler run on 2 different processes
+        from .appmain import main
+        main()
--- a/app/YtManagerApp/management/init.py
+++ b/app/YtManagerApp/management/init.py
--- a/app/YtManagerApp/management/downloader.py
+++ b/app/YtManagerApp/management/downloader.py
@@ -0,0 +1,103 @@
+from YtManagerApp.appconfig import settings
+from YtManagerApp.management.jobs.download_video import schedule_download_video
+from YtManagerApp.models import Video, Subscription, VIDEO_ORDER_MAPPING
+from django.conf import settings as srv_settings
+import logging
+import requests
+import mimetypes
+import os
+from urllib.parse import urljoin
+
+log = logging.getLogger('downloader')
+
+
+def __get_subscription_config(sub: Subscription):
+    enabled = settings.getboolean_sub(sub, 'user', 'AutoDownload')
+
+    global_limit = -1
+    if len(settings.get_sub(sub, 'user', 'DownloadGlobalLimit')) > 0:
+        global_limit = settings.getint_sub(sub, 'user', 'DownloadGlobalLimit')
+
+    limit = -1
+    if len(settings.get_sub(sub, 'user', 'DownloadSubscriptionLimit')) > 0:
+        limit = settings.getint_sub(sub, 'user', 'DownloadSubscriptionLimit')
+
+    order = settings.get_sub(sub, 'user', 'DownloadOrder')
+    order = VIDEO_ORDER_MAPPING[order]
+
+    return enabled, global_limit, limit, order
+
+
+def downloader_process_subscription(sub: Subscription):
+    log.info('Processing subscription %d [%s %s]', sub.id, sub.playlist_id, sub.id)
+
+    enabled, global_limit, limit, order = __get_subscription_config(sub)
+    log.info('Determined settings enabled=%s global_limit=%d limit=%d order="%s"', enabled, global_limit, limit, order)
+
+    if enabled:
+        videos_to_download = Video.objects\
+            .filter(subscription=sub, downloaded_path__isnull=True, watched=False)\
+            .order_by(order)
+
+        log.info('%d download candidates.', len(videos_to_download))
+
+        if global_limit > 0:
+            global_downloaded = Video.objects.filter(subscription__user=sub.user, downloaded_path__isnull=False).count()
+            allowed_count = max(global_limit - global_downloaded, 0)
+            videos_to_download = videos_to_download[0:allowed_count]
+            log.info('Global limit is set, can only download up to %d videos.', allowed_count)
+
+        if limit > 0:
+            sub_downloaded = Video.objects.filter(subscription=sub, downloaded_path__isnull=False).count()
+            allowed_count = max(limit - sub_downloaded, 0)
+            videos_to_download = videos_to_download[0:allowed_count]
+            log.info('Limit is set, can only download up to %d videos.', allowed_count)
+
+        # enqueue download
+        for video in videos_to_download:
+            log.info('Enqueuing video %d [%s %s] index=%d', video.id, video.video_id, video.name, video.playlist_index)
+            schedule_download_video(video)
+
+    log.info('Finished processing subscription %d [%s %s]', sub.id, sub.playlist_id, sub.id)
+
+
+def downloader_process_all():
+    for subscription in Subscription.objects.all():
+        downloader_process_subscription(subscription)
+
+
+def fetch_thumbnail(url, object_type, identifier, quality):
+
+    log.info('Fetching thumbnail url=%s object_type=%s identifier=%s quality=%s', url, object_type, identifier, quality)
+
+    # Make request to obtain mime type
+    try:
+        response = requests.get(url, stream=True)
+    except requests.exceptions.RequestException as e:
+        log.error('Failed to fetch thumbnail %s. Error: %s', url, e)
+        return url
+
+    ext = mimetypes.guess_extension(response.headers['Content-Type'])
+
+    # Build file path
+    file_name = f"{identifier}-{quality}{ext}"
+    abs_path_dir = os.path.join(srv_settings.MEDIA_ROOT, "thumbs", object_type)
+    abs_path = os.path.join(abs_path_dir, file_name)
+
+    # Store image
+    try:
+        os.makedirs(abs_path_dir, exist_ok=True)
+        with open(abs_path, "wb") as f:
+            for chunk in response.iter_content(chunk_size=1024):
+                if chunk:
+                    f.write(chunk)
+    except requests.exceptions.RequestException as e:
+        log.error('Error while downloading stream for thumbnail %s. Error: %s', url, e)
+        return url
+    except OSError as e:
+        log.error('Error while writing to file %s for thumbnail %s. Error: %s', abs_path, url, e)
+        return url
+
+    # Return
+    media_url = urljoin(srv_settings.MEDIA_URL, f"thumbs/{object_type}/{file_name}")
+    return media_url
--- a/app/YtManagerApp/management/jobs/init.py
+++ b/app/YtManagerApp/management/jobs/init.py
--- a/app/YtManagerApp/management/jobs/delete_video.py
+++ b/app/YtManagerApp/management/jobs/delete_video.py
@@ -0,0 +1,39 @@
+import logging
+import os
+
+from YtManagerApp import scheduler
+from YtManagerApp.models import Video
+
+log = logging.getLogger('video_downloader')
+
+
+def delete_video(video: Video):
+    log.info('Deleting video %d [%s %s]', video.id, video.video_id, video.name)
+    count = 0
+
+    try:
+        for file in video.get_files():
+            log.info("Deleting file %s", file)
+            count += 1
+            try:
+                os.unlink(file)
+            except OSError as e:
+                log.error("Failed to delete file %s: Error: %s", file, e)
+
+    except OSError as e:
+        log.error("Failed to delete video %d [%s %s]. Error: %s", video.id, video.video_id, video.name, e)
+
+    video.downloaded_path = None
+    video.save()
+
+    log.info('Deleted video %d successfully! (%d files) [%s %s]', video.id, count, video.video_id, video.name)
+
+
+def schedule_delete_video(video: Video):
+    """
+    Schedules a download video job to run immediately.
+    :param video:
+    :return:
+    """
+    job = scheduler.scheduler.add_job(delete_video, args=[video])
+    log.info('Scheduled delete video job video=(%s), job=%s', video, job.id)
--- a/app/YtManagerApp/management/jobs/download_video.py
+++ b/app/YtManagerApp/management/jobs/download_video.py
@@ -0,0 +1,110 @@
+from YtManagerApp.models import Video
+from YtManagerApp import scheduler
+from YtManagerApp.appconfig import settings
+import os
+import youtube_dl
+import logging
+import re
+
+log = logging.getLogger('video_downloader')
+log_youtube_dl = log.getChild('youtube_dl')
+
+
+def __get_valid_path(path):
+    """
+    Normalizes string, converts to lowercase, removes non-alpha characters,
+    and converts spaces to hyphens.
+    """
+    import unicodedata
+    value = unicodedata.normalize('NFKD', path).encode('ascii', 'ignore').decode('ascii')
+    value = re.sub('[:"*]', '', value).strip()
+    value = re.sub('[?<>|]', '#', value)
+    return value
+
+
+def __build_youtube_dl_params(video: Video):
+    # resolve path
+    pattern_dict = {
+        'channel': video.subscription.channel_name,
+        'channel_id': video.subscription.channel_id,
+        'playlist': video.subscription.name,
+        'playlist_id': video.subscription.playlist_id,
+        'playlist_index': "{:03d}".format(1 + video.playlist_index),
+        'title': video.name,
+        'id': video.video_id,
+    }
+
+    download_path = settings.get_sub(video.subscription, 'user', 'DownloadPath')
+    output_pattern = __get_valid_path(settings.get_sub(
+        video.subscription, 'user', 'DownloadFilePattern', vars=pattern_dict))
+
+    output_path = os.path.join(download_path, output_pattern)
+    output_path = os.path.normpath(output_path)
+
+    youtube_dl_params = {
+        'logger': log_youtube_dl,
+        'format': settings.get_sub(video.subscription, 'user', 'DownloadFormat'),
+        'outtmpl': output_path,
+        'writethumbnail': True,
+        'writedescription': True,
+        'writesubtitles': settings.getboolean_sub(video.subscription, 'user', 'DownloadSubtitles'),
+        'writeautomaticsub': settings.getboolean_sub(video.subscription, 'user', 'DownloadAutogeneratedSubtitles'),
+        'allsubtitles': settings.getboolean_sub(video.subscription, 'user', 'DownloadSubtitlesAll'),
+        'postprocessors': [
+            {
+                'key': 'FFmpegMetadata'
+            },
+        ]
+    }
+
+    sub_langs = settings.get_sub(video.subscription, 'user', 'DownloadSubtitlesLangs').split(',')
+    sub_langs = [i.strip() for i in sub_langs]
+    if len(sub_langs) > 0:
+        youtube_dl_params['subtitleslangs'] = sub_langs
+
+    sub_format = settings.get_sub(video.subscription, 'user', 'DownloadSubtitlesFormat')
+    if len(sub_format) > 0:
+        youtube_dl_params['subtitlesformat'] = sub_format
+
+    return youtube_dl_params, output_path
+
+
+def download_video(video: Video, attempt: int = 1):
+
+    log.info('Downloading video %d [%s %s]', video.id, video.video_id, video.name)
+
+    max_attempts = settings.getint_sub(video.subscription, 'user', 'DownloadMaxAttempts', fallback=3)
+
+    youtube_dl_params, output_path = __build_youtube_dl_params(video)
+    with youtube_dl.YoutubeDL(youtube_dl_params) as yt:
+        ret = yt.download(["https://www.youtube.com/watch?v=" + video.video_id])
+
+    log.info('Download finished with code %d', ret)
+
+    if ret == 0:
+        video.downloaded_path = output_path
+        video.save()
+        log.info('Video %d [%s %s] downloaded successfully!', video.id, video.video_id, video.name)
+
+    elif attempt <= max_attempts:
+        log.warning('Re-enqueueing video (attempt %d/%d)', attempt, max_attempts)
+        __schedule_download_video(video, attempt + 1)
+
+    else:
+        log.error('Multiple attempts to download video %d [%s %s] failed!', video.id, video.video_id, video.name)
+        video.downloaded_path = ''
+        video.save()
+
+
+def __schedule_download_video(video: Video, attempt=1):
+    job = scheduler.scheduler.add_job(download_video, args=[video, attempt])
+    log.info('Scheduled download video job video=(%s), attempt=%d, job=%s', video, attempt, job.id)
+
+
+def schedule_download_video(video: Video):
+    """
+    Schedules a download video job to run immediately.
+    :param video:
+    :return:
+    """
+    __schedule_download_video(video)
--- a/app/YtManagerApp/management/jobs/synchronize.py
+++ b/app/YtManagerApp/management/jobs/synchronize.py
@@ -0,0 +1,162 @@
+import errno
+import mimetypes
+from threading import Lock
+
+from apscheduler.triggers.cron import CronTrigger
+
+from YtManagerApp import scheduler
+from YtManagerApp.appconfig import settings
+from YtManagerApp.management.downloader import fetch_thumbnail, downloader_process_all, downloader_process_subscription
+from YtManagerApp.models import *
+from YtManagerApp.utils import youtube
+
+log = logging.getLogger('sync')
+__lock = Lock()
+
+_ENABLE_UPDATE_STATS = True
+
+
+def __check_new_videos_sub(subscription: Subscription, yt_api: youtube.YoutubeAPI):
+    # Get list of videos
+    for item in yt_api.playlist_items(subscription.playlist_id):
+        results = Video.objects.filter(video_id=item.resource_video_id, subscription=subscription)
+        if len(results) == 0:
+            log.info('New video for subscription %s: %s %s"', subscription, item.resource_video_id, item.title)
+            Video.create(item, subscription)
+
+    if _ENABLE_UPDATE_STATS:
+        all_vids = Video.objects.filter(subscription=subscription)
+        all_vids_ids = [video.video_id for video in all_vids]
+        all_vids_dict = {v.video_id: v for v in all_vids}
+
+        for yt_video in yt_api.videos(all_vids_ids, part='id,statistics'):
+            video = all_vids_dict.get(yt_video.id)
+
+            if yt_video.n_likes is not None \
+                    and yt_video.n_dislikes is not None \
+                    and yt_video.n_likes + yt_video.n_dislikes > 0:
+                video.rating = yt_video.n_likes / (yt_video.n_likes + yt_video.n_dislikes)
+
+            video.views = yt_video.n_views
+            video.save()
+
+
+def __detect_deleted(subscription: Subscription):
+
+    for video in Video.objects.filter(subscription=subscription, downloaded_path__isnull=False):
+        found_video = False
+        files = []
+        try:
+            files = list(video.get_files())
+        except OSError as e:
+            if e.errno != errno.ENOENT:
+                log.error("Could not access path %s. Error: %s", video.downloaded_path, e)
+                return
+
+        # Try to find a valid video file
+        for file in files:
+            mime, _ = mimetypes.guess_type(file)
+            if mime is not None and mime.startswith("video"):
+                found_video = True
+
+        # Video not found, we can safely assume that the video was deleted.
+        if not found_video:
+            log.info("Video %d was deleted! [%s %s]", video.id, video.video_id, video.name)
+            # Clean up
+            for file in files:
+                try:
+                    os.unlink(file)
+                except OSError as e:
+                    log.error("Could not delete redundant file %s. Error: %s", file, e)
+            video.downloaded_path = None
+
+            # Mark watched?
+            if settings.getboolean_sub(subscription, 'user', 'MarkDeletedAsWatched'):
+                video.watched = True
+
+            video.save()
+
+
+def __fetch_thumbnails_obj(iterable, obj_type, id_attr):
+    for obj in iterable:
+        if obj.icon_default.startswith("http"):
+            obj.icon_default = fetch_thumbnail(obj.icon_default, obj_type, getattr(obj, id_attr), 'default')
+        if obj.icon_best.startswith("http"):
+            obj.icon_best = fetch_thumbnail(obj.icon_best, obj_type, getattr(obj, id_attr), 'best')
+        obj.save()
+
+
+def __fetch_thumbnails():
+    log.info("Fetching subscription thumbnails... ")
+    __fetch_thumbnails_obj(Subscription.objects.filter(icon_default__istartswith='http'), 'sub', 'playlist_id')
+    __fetch_thumbnails_obj(Subscription.objects.filter(icon_best__istartswith='http'), 'sub', 'playlist_id')
+
+    log.info("Fetching video thumbnails... ")
+    __fetch_thumbnails_obj(Video.objects.filter(icon_default__istartswith='http'), 'video', 'video_id')
+    __fetch_thumbnails_obj(Video.objects.filter(icon_best__istartswith='http'), 'video', 'video_id')
+
+
+def synchronize():
+    if not __lock.acquire(blocking=False):
+        # Synchronize already running in another thread
+        log.info("Synchronize already running in another thread")
+        return
+
+    try:
+        log.info("Running scheduled synchronization... ")
+
+        # Sync subscribed playlists/channels
+        log.info("Sync - checking videos")
+        yt_api = youtube.YoutubeAPI.build_public()
+        for subscription in Subscription.objects.all():
+            __check_new_videos_sub(subscription, yt_api)
+            __detect_deleted(subscription)
+
+        log.info("Sync - checking for videos to download")
+        downloader_process_all()
+
+        log.info("Sync - fetching missing thumbnails")
+        __fetch_thumbnails()
+
+        log.info("Synchronization finished.")
+
+    finally:
+        __lock.release()
+
+
+def synchronize_subscription(subscription: Subscription):
+    __lock.acquire()
+    try:
+        log.info("Running synchronization for single subscription %d [%s]", subscription.id, subscription.name)
+        yt_api = youtube.YoutubeAPI.build_public()
+
+        log.info("Sync - checking videos")
+        __check_new_videos_sub(subscription, yt_api)
+        __detect_deleted(subscription)
+
+        log.info("Sync - checking for videos to download")
+        downloader_process_subscription(subscription)
+
+        log.info("Sync - fetching missing thumbnails")
+        __fetch_thumbnails()
+
+        log.info("Synchronization finished for subscription %d [%s].", subscription.id, subscription.name)
+
+    finally:
+        __lock.release()
+
+
+def schedule_synchronize_global():
+    trigger = CronTrigger.from_crontab(settings.get('global', 'SynchronizationSchedule'))
+    job = scheduler.scheduler.add_job(synchronize, trigger, max_instances=1, coalesce=True)
+    log.info('Scheduled synchronize job job=%s', job.id)
+
+
+def schedule_synchronize_now():
+    job = scheduler.scheduler.add_job(synchronize, max_instances=1, coalesce=True)
+    log.info('Scheduled synchronize now job job=%s', job.id)
+
+
+def schedule_synchronize_now_subscription(subscription: Subscription):
+    job = scheduler.scheduler.add_job(synchronize_subscription, args=[subscription])
+    log.info('Scheduled synchronize subscription job subscription=(%s), job=%s', subscription, job.id)
--- a/app/YtManagerApp/management/subscriptions.py
+++ b/app/YtManagerApp/management/subscriptions.py
--- a/app/YtManagerApp/management/videos.py
+++ b/app/YtManagerApp/management/videos.py
@@ -0,0 +1,57 @@
+import re
+from typing import Optional
+
+from django.contrib.auth.models import User
+from django.db.models import Q
+
+from YtManagerApp.models import Subscription, Video, SubscriptionFolder
+
+
+def get_videos(user: User,
+               sort_order: Optional[str],
+               query: Optional[str] = None,
+               subscription_id: Optional[int] = None,
+               folder_id: Optional[int] = None,
+               only_watched: Optional[bool] = None,
+               only_downloaded: Optional[bool] = None,
+               ):
+
+    filter_args = []
+    filter_kwargs = {
+        'subscription__user': user
+    }
+
+    # Process query string - basically, we break it down into words,
+    # and then search for the given text in the name, description, uploader name and subscription name
+    if query is not None:
+        for match in re.finditer(r'\w+', query):
+            word = match[0]
+            filter_args.append(Q(name__icontains=word)
+                               | Q(description__icontains=word)
+                               | Q(uploader_name__icontains=word)
+                               | Q(subscription__name__icontains=word))
+
+    # Subscription id
+    if subscription_id is not None:
+        filter_kwargs['subscription_id'] = subscription_id
+
+    # Folder id
+    if folder_id is not None:
+        # Visit function - returns only the subscription IDs
+        def visit(node):
+            if isinstance(node, Subscription):
+                return node.id
+            return None
+        filter_kwargs['subscription_id__in'] = SubscriptionFolder.traverse(folder_id, user, visit)
+
+    # Only watched
+    if only_watched is not None:
+        filter_kwargs['watched'] = only_watched
+
+    # Only downloaded
+    # - not downloaded (False) -> is null (True)
+    # - downloaded (True) -> is not null (False)
+    if only_downloaded is not None:
+        filter_kwargs['downloaded_path__isnull'] = not only_downloaded
+
+    return Video.objects.filter(*filter_args, **filter_kwargs).order_by(sort_order)
--- a/app/YtManagerApp/migrations/0001_initial.py
+++ b/app/YtManagerApp/migrations/0001_initial.py
@@ -0,0 +1,102 @@
+# Generated by Django 2.1.2 on 2018-10-11 00:19
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Channel',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('channel_id', models.TextField(unique=True)),
+                ('username', models.TextField(null=True, unique=True)),
+                ('custom_url', models.TextField(null=True, unique=True)),
+                ('name', models.TextField()),
+                ('description', models.TextField()),
+                ('icon_default', models.TextField()),
+                ('icon_best', models.TextField()),
+                ('upload_playlist_id', models.TextField()),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Subscription',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.TextField()),
+                ('playlist_id', models.TextField(unique=True)),
+                ('description', models.TextField()),
+                ('icon_default', models.TextField()),
+                ('icon_best', models.TextField()),
+                ('auto_download', models.BooleanField(null=True)),
+                ('download_limit', models.IntegerField(null=True)),
+                ('download_order', models.TextField(null=True)),
+                ('manager_delete_after_watched', models.BooleanField(null=True)),
+                ('channel', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='YtManagerApp.Channel')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='SubscriptionFolder',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.TextField()),
+                ('parent', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='YtManagerApp.SubscriptionFolder')),
+            ],
+        ),
+        migrations.CreateModel(
+            name='UserSettings',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('mark_deleted_as_watched', models.BooleanField(null=True)),
+                ('delete_watched', models.BooleanField(null=True)),
+                ('auto_download', models.BooleanField(null=True)),
+                ('download_global_limit', models.IntegerField(null=True)),
+                ('download_subscription_limit', models.IntegerField(null=True)),
+                ('download_order', models.TextField(null=True)),
+                ('download_path', models.TextField(null=True)),
+                ('download_file_pattern', models.TextField(null=True)),
+                ('download_format', models.TextField(null=True)),
+                ('download_subtitles', models.BooleanField(null=True)),
+                ('download_autogenerated_subtitles', models.BooleanField(null=True)),
+                ('download_subtitles_all', models.BooleanField(null=True)),
+                ('download_subtitles_langs', models.TextField(null=True)),
+                ('download_subtitles_format', models.TextField(null=True)),
+                ('user', models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='Video',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('video_id', models.TextField()),
+                ('name', models.TextField()),
+                ('description', models.TextField()),
+                ('watched', models.BooleanField(default=False)),
+                ('downloaded_path', models.TextField(blank=True, null=True)),
+                ('playlist_index', models.IntegerField()),
+                ('publish_date', models.DateTimeField()),
+                ('icon_default', models.TextField()),
+                ('icon_best', models.TextField()),
+                ('subscription', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='YtManagerApp.Subscription')),
+            ],
+        ),
+        migrations.AddField(
+            model_name='subscription',
+            name='parent_folder',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='YtManagerApp.SubscriptionFolder'),
+        ),
+        migrations.AddField(
+            model_name='subscription',
+            name='user',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
+        ),
+    ]
--- a/app/YtManagerApp/migrations/0002_subscriptionfolder_user.py
+++ b/app/YtManagerApp/migrations/0002_subscriptionfolder_user.py
@@ -0,0 +1,22 @@
+# Generated by Django 2.1.2 on 2018-10-11 18:16
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('YtManagerApp', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='subscriptionfolder',
+            name='user',
+            field=models.ForeignKey(default=1, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL),
+            preserve_default=False,
+        ),
+    ]
--- a/app/YtManagerApp/migrations/0003_auto_20181013_2018.py
+++ b/app/YtManagerApp/migrations/0003_auto_20181013_2018.py
@@ -0,0 +1,29 @@
+# Generated by Django 2.1.2 on 2018-10-13 17:18
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('YtManagerApp', '0002_subscriptionfolder_user'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='video',
+            name='rating',
+            field=models.FloatField(default=0.5),
+        ),
+        migrations.AddField(
+            model_name='video',
+            name='uploader_name',
+            field=models.TextField(default=None),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='video',
+            name='views',
+            field=models.IntegerField(default=0),
+        ),
+    ]
--- a/app/YtManagerApp/migrations/0004_auto_20181014_1702.py
+++ b/app/YtManagerApp/migrations/0004_auto_20181014_1702.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.1.2 on 2018-10-14 14:02
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('YtManagerApp', '0003_auto_20181013_2018'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='subscriptionfolder',
+            name='name',
+            field=models.CharField(max_length=250),
+        ),
+    ]
--- a/app/YtManagerApp/migrations/0005_auto_20181026_2013.py
+++ b/app/YtManagerApp/migrations/0005_auto_20181026_2013.py
@@ -0,0 +1,134 @@
+# Generated by Django 2.1.2 on 2018-10-26 17:13
+
+from django.db import migrations, models
+import django.db.models.deletion
+import django.db.models.functions.text
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('YtManagerApp', '0004_auto_20181014_1702'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='subscriptionfolder',
+            options={'ordering': [django.db.models.functions.text.Lower('parent__name'), django.db.models.functions.text.Lower('name')]},
+        ),
+        migrations.AlterField(
+            model_name='subscription',
+            name='auto_download',
+            field=models.BooleanField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name='subscription',
+            name='download_limit',
+            field=models.IntegerField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name='subscription',
+            name='download_order',
+            field=models.CharField(blank=True, choices=[('newest', 'Newest'), ('oldest', 'Oldest'), ('playlist', 'Playlist order'), ('playlist_reverse', 'Reverse playlist order'), ('popularity', 'Popularity'), ('rating', 'Top rated')], max_length=128, null=True),
+        ),
+        migrations.AlterField(
+            model_name='subscription',
+            name='icon_best',
+            field=models.CharField(max_length=1024),
+        ),
+        migrations.AlterField(
+            model_name='subscription',
+            name='icon_default',
+            field=models.CharField(max_length=1024),
+        ),
+        migrations.AlterField(
+            model_name='subscription',
+            name='manager_delete_after_watched',
+            field=models.BooleanField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name='subscription',
+            name='name',
+            field=models.CharField(max_length=1024),
+        ),
+        migrations.AlterField(
+            model_name='subscription',
+            name='parent_folder',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='YtManagerApp.SubscriptionFolder'),
+        ),
+        migrations.AlterField(
+            model_name='subscription',
+            name='playlist_id',
+            field=models.CharField(max_length=128),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='auto_download',
+            field=models.BooleanField(blank=True, help_text='Enables or disables automatic downloading.', null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='delete_watched',
+            field=models.BooleanField(blank=True, help_text='Videos marked as watched are automatically deleted.', null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_autogenerated_subtitles',
+            field=models.BooleanField(blank=True, help_text='Enables downloading the automatically generated subtitle. The flag is passed directly to youtube-dl. You can find more information <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.', null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_file_pattern',
+            field=models.CharField(blank=True, help_text='A pattern which describes how downloaded files are organized. Extensions are automatically appended. You can use the following fields, using the <code>${field}</code> syntax: channel, channel_id, playlist, playlist_id, playlist_index, title, id. Example: <code>${channel}/${playlist}/S01E${playlist_index} - ${title} [${id}]</code>', max_length=1024, null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_format',
+            field=models.CharField(blank=True, help_text='Download format that will be passed to youtube-dl.  See the <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#format-selection"> youtube-dl documentation</a> for more details.', max_length=256, null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_global_limit',
+            field=models.IntegerField(blank=True, help_text='Limits the total number of videos downloaded (-1 = no limit).', null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_order',
+            field=models.CharField(blank=True, choices=[('newest', 'Newest'), ('oldest', 'Oldest'), ('playlist', 'Playlist order'), ('playlist_reverse', 'Reverse playlist order'), ('popularity', 'Popularity'), ('rating', 'Top rated')], help_text='The order in which videos will be downloaded.', max_length=100, null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_path',
+            field=models.CharField(blank=True, help_text='Path on the disk where downloaded videos are stored.  You can use environment variables using syntax: <code>${env:...}</code>', max_length=1024, null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_subscription_limit',
+            field=models.IntegerField(blank=True, help_text='Limits the number of videos downloaded per subscription (-1 = no limit).  This setting can be overriden for each individual subscription in the subscription edit dialog.', null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_subtitles',
+            field=models.BooleanField(blank=True, help_text='Enable downloading subtitles for the videos. The flag is passed directly to youtube-dl. You can find more information <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.', null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_subtitles_all',
+            field=models.BooleanField(blank=True, help_text='If enabled, all the subtitles in all the available languages will be downloaded. The flag is passed directly to youtube-dl. You can find more information <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.', null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_subtitles_format',
+            field=models.CharField(blank=True, help_text='Subtitles format preference. Examples: srt/ass/best The flag is passed directly to youtube-dl. You can find more information <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.', max_length=100, null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='download_subtitles_langs',
+            field=models.CharField(blank=True, help_text='Comma separated list of languages for which subtitles will be downloaded. The flag is passed directly to youtube-dl. You can find more information <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.', max_length=250, null=True),
+        ),
+        migrations.AlterField(
+            model_name='usersettings',
+            name='mark_deleted_as_watched',
+            field=models.BooleanField(blank=True, help_text="When a downloaded video is deleted from the system, it will be marked as 'watched'.", null=True),
+        ),
+    ]
--- a/app/YtManagerApp/migrations/0006_auto_20181027_0256.py
+++ b/app/YtManagerApp/migrations/0006_auto_20181027_0256.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.1.2 on 2018-10-26 23:56
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('YtManagerApp', '0005_auto_20181026_2013'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='subscription',
+            old_name='manager_delete_after_watched',
+            new_name='delete_after_watched',
+        ),
+    ]
--- a/app/YtManagerApp/migrations/0007_auto_20181029_1638.py
+++ b/app/YtManagerApp/migrations/0007_auto_20181029_1638.py
@@ -0,0 +1,32 @@
+# Generated by Django 2.1.2 on 2018-10-29 16:38
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('YtManagerApp', '0006_auto_20181027_0256'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='subscription',
+            name='channel',
+        ),
+        migrations.AddField(
+            model_name='subscription',
+            name='channel_id',
+            field=models.CharField(default='test', max_length=128),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='subscription',
+            name='channel_name',
+            field=models.CharField(default='Unknown', max_length=1024),
+            preserve_default=False,
+        ),
+        migrations.DeleteModel(
+            name='Channel',
+        ),
+    ]
--- a/app/YtManagerApp/migrations/init.py
+++ b/app/YtManagerApp/migrations/init.py
--- a/app/YtManagerApp/models.py
+++ b/app/YtManagerApp/models.py
@@ -0,0 +1,385 @@
+import logging
+from typing import Callable, Union, Any, Optional
+import os
+
+from django.contrib.auth.models import User
+from django.contrib.auth.models import User
+from django.db import models
+from django.db.models.functions import Lower
+from YtManagerApp.utils import youtube
+
+# help_text = user shown text
+# verbose_name = user shown name
+# null = nullable, blank = user is allowed to set value to empty
+VIDEO_ORDER_CHOICES = [
+    ('newest', 'Newest'),
+    ('oldest', 'Oldest'),
+    ('playlist', 'Playlist order'),
+    ('playlist_reverse', 'Reverse playlist order'),
+    ('popularity', 'Popularity'),
+    ('rating', 'Top rated'),
+]
+
+VIDEO_ORDER_MAPPING = {
+    'newest': '-publish_date',
+    'oldest': 'publish_date',
+    'playlist': 'playlist_index',
+    'playlist_reverse': '-playlist_index',
+    'popularity': '-views',
+    'rating': '-rating'
+}
+
+
+class UserSettings(models.Model):
+    user = models.OneToOneField(User, on_delete=models.CASCADE)
+
+    mark_deleted_as_watched = models.BooleanField(
+        null=True, blank=True,
+        help_text='When a downloaded video is deleted from the system, it will be marked as \'watched\'.')
+
+    delete_watched = models.BooleanField(
+        null=True, blank=True,
+        help_text='Videos marked as watched are automatically deleted.')
+
+    auto_download = models.BooleanField(
+        null=True, blank=True,
+        help_text='Enables or disables automatic downloading.')
+
+    download_global_limit = models.IntegerField(
+        null=True, blank=True,
+        help_text='Limits the total number of videos downloaded (-1 = no limit).')
+
+    download_subscription_limit = models.IntegerField(
+        null=True, blank=True,
+        help_text='Limits the number of videos downloaded per subscription (-1 = no limit). '
+                  ' This setting can be overriden for each individual subscription in the subscription edit dialog.')
+
+    download_order = models.CharField(
+        null=True, blank=True,
+        max_length=100,
+        choices=VIDEO_ORDER_CHOICES,
+        help_text='The order in which videos will be downloaded.'
+    )
+
+    download_path = models.CharField(
+        null=True, blank=True,
+        max_length=1024,
+        help_text='Path on the disk where downloaded videos are stored. '
+                  ' You can use environment variables using syntax: <code>${env:...}</code>'
+    )
+
+    download_file_pattern = models.CharField(
+        null=True, blank=True,
+        max_length=1024,
+        help_text='A pattern which describes how downloaded files are organized. Extensions are automatically appended.'
+                  ' You can use the following fields, using the <code>${field}</code> syntax:'
+                  ' channel, channel_id, playlist, playlist_id, playlist_index, title, id.'
+                  ' Example: <code>${channel}/${playlist}/S01E${playlist_index} - ${title} [${id}]</code>')
+
+    download_format = models.CharField(
+        null=True, blank=True,
+        max_length=256,
+        help_text='Download format that will be passed to youtube-dl. '
+                  ' See the <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#format-selection">'
+                  ' youtube-dl documentation</a> for more details.')
+
+    download_subtitles = models.BooleanField(
+        null=True, blank=True,
+        help_text='Enable downloading subtitles for the videos.'
+                  ' The flag is passed directly to youtube-dl. You can find more information'
+                  ' <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.')
+
+    download_autogenerated_subtitles = models.BooleanField(
+        null=True, blank=True,
+        help_text='Enables downloading the automatically generated subtitle.'
+                  ' The flag is passed directly to youtube-dl. You can find more information'
+                  ' <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.')
+
+    download_subtitles_all = models.BooleanField(
+        null=True, blank=True,
+        help_text='If enabled, all the subtitles in all the available languages will be downloaded.'
+                  ' The flag is passed directly to youtube-dl. You can find more information'
+                  ' <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.')
+
+    download_subtitles_langs = models.CharField(
+        null=True, blank=True,
+        max_length=250,
+        help_text='Comma separated list of languages for which subtitles will be downloaded.'
+                  ' The flag is passed directly to youtube-dl. You can find more information'
+                  ' <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.')
+
+    download_subtitles_format = models.CharField(
+        null=True, blank=True,
+        max_length=100,
+        help_text='Subtitles format preference. Examples: srt/ass/best'
+                  ' The flag is passed directly to youtube-dl. You can find more information'
+                  ' <a href="https://github.com/rg3/youtube-dl/blob/master/README.md#subtitle-options">here</a>.')
+
+    @staticmethod
+    def find_by_user(user: User):
+        result = UserSettings.objects.filter(user=user)
+        if len(result) > 0:
+            return result.first()
+        return None
+
+    def __str__(self):
+        return str(self.user)
+
+    def to_dict(self):
+        ret = {}
+
+        if self.mark_deleted_as_watched is not None:
+            ret['MarkDeletedAsWatched'] = self.mark_deleted_as_watched
+        if self.delete_watched is not None:
+            ret['DeleteWatched'] = self.delete_watched
+        if self.auto_download is not None:
+            ret['AutoDownload'] = self.auto_download
+        if self.download_global_limit is not None:
+            ret['DownloadGlobalLimit'] = self.download_global_limit
+        if self.download_subscription_limit is not None:
+            ret['DownloadSubscriptionLimit'] = self.download_subscription_limit
+        if self.download_order is not None:
+            ret['DownloadOrder'] = self.download_order
+        if self.download_path is not None:
+            ret['DownloadPath'] = self.download_path
+        if self.download_file_pattern is not None:
+            ret['DownloadFilePattern'] = self.download_file_pattern
+        if self.download_format is not None:
+            ret['DownloadFormat'] = self.download_format
+        if self.download_subtitles is not None:
+            ret['DownloadSubtitles'] = self.download_subtitles
+        if self.download_autogenerated_subtitles is not None:
+            ret['DownloadAutogeneratedSubtitles'] = self.download_autogenerated_subtitles
+        if self.download_subtitles_all is not None:
+            ret['DownloadSubtitlesAll'] = self.download_subtitles_all
+        if self.download_subtitles_langs is not None:
+            ret['DownloadSubtitlesLangs'] = self.download_subtitles_langs
+        if self.download_subtitles_format is not None:
+            ret['DownloadSubtitlesFormat'] = self.download_subtitles_format
+
+        return ret
+
+
+class SubscriptionFolder(models.Model):
+    name = models.CharField(null=False, max_length=250)
+    parent = models.ForeignKey('self', on_delete=models.CASCADE, null=True, blank=True)
+    user = models.ForeignKey(User, on_delete=models.CASCADE, null=False, blank=False)
+
+    class Meta:
+        ordering = [Lower('parent__name'), Lower('name')]
+
+    def __str__(self):
+        s = ""
+        current = self
+        while current is not None:
+            s = current.name + " > " + s
+            current = current.parent
+        return s[:-3]
+
+    def __repr__(self):
+        return f'folder {self.id}, name="{self.name}"'
+
+    def delete_folder(self, keep_subscriptions: bool):
+        if keep_subscriptions:
+
+            def visit(node: Union["SubscriptionFolder", "Subscription"]):
+                if isinstance(node, Subscription):
+                    node.parent_folder = None
+                    node.save()
+
+            SubscriptionFolder.traverse(self.id, self.user, visit)
+
+        self.delete()
+
+    @staticmethod
+    def traverse(root_folder_id: Optional[int],
+                 user: User,
+                 visit_func: Callable[[Union["SubscriptionFolder", "Subscription"]], Any]):
+
+        data_collected = []
+
+        def collect(data):
+            if data is not None:
+                data_collected.append(data)
+
+        # Visit root
+        if root_folder_id is not None:
+            root_folder = SubscriptionFolder.objects.get(id=root_folder_id)
+            collect(visit_func(root_folder))
+
+        queue = [root_folder_id]
+        visited = []
+
+        while len(queue) > 0:
+            folder_id = queue.pop()
+
+            if folder_id in visited:
+                logging.error('Found folder tree cycle for folder id %d.', folder_id)
+                continue
+            visited.append(folder_id)
+
+            for folder in SubscriptionFolder.objects.filter(parent_id=folder_id, user=user).order_by(Lower('name')):
+                collect(visit_func(folder))
+                queue.append(folder.id)
+
+            for subscription in Subscription.objects.filter(parent_folder_id=folder_id, user=user).order_by(Lower('name')):
+                collect(visit_func(subscription))
+
+        return data_collected
+
+
+class Subscription(models.Model):
+    name = models.CharField(null=False, max_length=1024)
+    parent_folder = models.ForeignKey(SubscriptionFolder, on_delete=models.CASCADE, null=True, blank=True)
+    playlist_id = models.CharField(null=False, max_length=128)
+    description = models.TextField()
+    channel_id = models.CharField(max_length=128)
+    channel_name = models.CharField(max_length=1024)
+    icon_default = models.CharField(max_length=1024)
+    icon_best = models.CharField(max_length=1024)
+    user = models.ForeignKey(User, on_delete=models.CASCADE)
+
+    # overrides
+    auto_download = models.BooleanField(null=True, blank=True)
+    download_limit = models.IntegerField(null=True, blank=True)
+    download_order = models.CharField(
+        null=True, blank=True,
+        max_length=128,
+        choices=VIDEO_ORDER_CHOICES)
+    delete_after_watched = models.BooleanField(null=True, blank=True)
+
+    def __str__(self):
+        return self.name
+
+    def __repr__(self):
+        return f'subscription {self.id}, name="{self.name}", playlist_id="{self.playlist_id}"'
+
+    def fill_from_playlist(self, info_playlist: youtube.Playlist):
+        self.name = info_playlist.title
+        self.playlist_id = info_playlist.id
+        self.description = info_playlist.description
+        self.channel_id = info_playlist.channel_id
+        self.channel_name = info_playlist.channel_title
+        self.icon_default = youtube.default_thumbnail(info_playlist).url
+        self.icon_best = youtube.best_thumbnail(info_playlist).url
+
+    def copy_from_channel(self, info_channel: youtube.Channel):
+        # No point in storing info about the 'uploads from X' playlist
+        self.name = info_channel.title
+        self.playlist_id = info_channel.uploads_playlist.id
+        self.description = info_channel.description
+        self.channel_id = info_channel.id
+        self.channel_name = info_channel.title
+        self.icon_default = youtube.default_thumbnail(info_channel).url
+        self.icon_best = youtube.best_thumbnail(info_channel).url
+
+    def fetch_from_url(self, url, yt_api: youtube.YoutubeAPI):
+        url_parsed = yt_api.parse_url(url)
+        if 'playlist' in url_parsed:
+            info_playlist = yt_api.playlist(url=url)
+            if info_playlist is None:
+                raise ValueError('Invalid playlist ID!')
+
+            self.fill_from_playlist(info_playlist)
+        else:
+            info_channel = yt_api.channel(url=url)
+            if info_channel is None:
+                raise ValueError('Cannot find channel!')
+
+            self.copy_from_channel(info_channel)
+
+    def delete_subscription(self, keep_downloaded_videos: bool):
+        self.delete()
+
+    def get_overloads_dict(self) -> dict:
+        d = {}
+        if self.auto_download is not None:
+            d['AutoDownload'] = self.auto_download
+        if self.download_limit is not None:
+            d['DownloadSubscriptionLimit'] = self.download_limit
+        if self.download_order is not None:
+            d['DownloadOrder'] = self.download_order
+        if self.delete_after_watched is not None:
+            d['DeleteWatched'] = self.delete_after_watched
+        return d
+
+
+class Video(models.Model):
+    video_id = models.TextField(null=False)
+    name = models.TextField(null=False)
+    description = models.TextField()
+    watched = models.BooleanField(default=False, null=False)
+    downloaded_path = models.TextField(null=True, blank=True)
+    subscription = models.ForeignKey(Subscription, on_delete=models.CASCADE)
+    playlist_index = models.IntegerField(null=False)
+    publish_date = models.DateTimeField(null=False)
+    icon_default = models.TextField()
+    icon_best = models.TextField()
+    uploader_name = models.TextField(null=False)
+    views = models.IntegerField(null=False, default=0)
+    rating = models.FloatField(null=False, default=0.5)
+
+    @staticmethod
+    def create(playlist_item: youtube.PlaylistItem, subscription: Subscription):
+        video = Video()
+        video.video_id = playlist_item.resource_video_id
+        video.name = playlist_item.title
+        video.description = playlist_item.description
+        video.watched = False
+        video.downloaded_path = None
+        video.subscription = subscription
+        video.playlist_index = playlist_item.position
+        video.publish_date = playlist_item.published_at
+        video.icon_default = youtube.default_thumbnail(playlist_item).url
+        video.icon_best = youtube.best_thumbnail(playlist_item).url
+        video.save()
+        return video
+
+    def mark_watched(self):
+        self.watched = True
+        self.save()
+        if self.downloaded_path is not None:
+            from YtManagerApp.appconfig import settings
+            from YtManagerApp.management.jobs.delete_video import schedule_delete_video
+            from YtManagerApp.management.jobs.synchronize import schedule_synchronize_now_subscription
+
+            if settings.getboolean_sub(self.subscription, 'user', 'DeleteWatched'):
+                schedule_delete_video(self)
+                schedule_synchronize_now_subscription(self.subscription)
+
+    def mark_unwatched(self):
+        from YtManagerApp.management.jobs.synchronize import schedule_synchronize_now_subscription
+        self.watched = False
+        self.save()
+        schedule_synchronize_now_subscription(self.subscription)
+
+    def get_files(self):
+        if self.downloaded_path is not None:
+            directory, file_pattern = os.path.split(self.downloaded_path)
+            for file in os.listdir(directory):
+                if file.startswith(file_pattern):
+                    yield os.path.join(directory, file)
+
+    def delete_files(self):
+        if self.downloaded_path is not None:
+            from YtManagerApp.management.jobs.delete_video import schedule_delete_video
+            from YtManagerApp.appconfig import settings
+            from YtManagerApp.management.jobs.synchronize import schedule_synchronize_now_subscription
+
+            schedule_delete_video(self)
+
+            # Mark watched?
+            if settings.getboolean_sub(self, 'user', 'MarkDeletedAsWatched'):
+                self.watched = True
+                schedule_synchronize_now_subscription(self.subscription)
+
+    def download(self):
+        if not self.downloaded_path:
+            from YtManagerApp.management.jobs.download_video import schedule_download_video
+            schedule_download_video(self)
+
+    def __str__(self):
+        return self.name
+
+    def __repr__(self):
+        return f'video {self.id}, video_id="{self.video_id}"'
--- a/app/YtManagerApp/scheduler.py
+++ b/app/YtManagerApp/scheduler.py
@@ -0,0 +1,24 @@
+import logging
+import sys
+from apscheduler.schedulers.background import BackgroundScheduler
+
+scheduler: BackgroundScheduler = None
+
+
+def initialize_scheduler():
+    from .appconfig import settings
+    global scheduler
+
+    logger = logging.getLogger('scheduler')
+    executors = {
+        'default': {
+            'type': 'threadpool',
+            'max_workers': settings.getint('global', 'SchedulerConcurrency')
+        }
+    }
+    job_defaults = {
+        'misfire_grace_time': 60 * 60 * 24 * 365        # 1 year
+    }
+
+    scheduler = BackgroundScheduler(logger=logger, executors=executors, job_defaults=job_defaults)
+    scheduler.start()
--- a/app/YtManagerApp/static/YtManagerApp/css/login.css
+++ b/app/YtManagerApp/static/YtManagerApp/css/login.css
@@ -0,0 +1,9 @@
+.login-card {
+  width: 26rem;
+  margin: 2rem 0; }
+
+.register-card {
+  max-width: 35rem;
+  margin: 2rem 0; }
+
+/*# sourceMappingURL=login.css.map */
--- a/app/YtManagerApp/static/YtManagerApp/css/login.css.map
+++ b/app/YtManagerApp/static/YtManagerApp/css/login.css.map
@@ -0,0 +1,7 @@
+{
+"version": 3,
+"mappings": "AAAA,WAAY;EACR,KAAK,EAAE,KAAK;EACZ,MAAM,EAAE,MAAM;;AAGlB,cAAe;EACX,SAAS,EAAE,KAAK;EAChB,MAAM,EAAE,MAAM",
+"sources": ["login.scss"],
+"names": [],
+"file": "login.css"
+}
--- a/app/YtManagerApp/static/YtManagerApp/css/login.scss
+++ b/app/YtManagerApp/static/YtManagerApp/css/login.scss
@@ -0,0 +1,9 @@
+.login-card {
+    max-width: 26rem;
+    margin: 2rem 0;
+}
+
+.register-card {
+    max-width: 35rem;
+    margin: 2rem 0;
+}
--- a/app/YtManagerApp/static/YtManagerApp/css/style.css
+++ b/app/YtManagerApp/static/YtManagerApp/css/style.css
@@ -0,0 +1,122 @@
+#main_body {
+  margin-bottom: 4rem; }
+
+#main_footer {
+  position: fixed;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  height: 2rem;
+  line-height: 2rem;
+  padding: 0rem 1rem;
+  display: flex;
+  align-content: center;
+  font-size: 10pt; }
+
+/* Loading animation */
+.loading-dual-ring {
+  display: inline-block;
+  width: 64px;
+  height: 64px; }
+  .loading-dual-ring:after {
+    content: " ";
+    display: block;
+    width: 46px;
+    height: 46px;
+    margin: 1px;
+    border-radius: 50%;
+    border: 5px solid #007bff;
+    border-color: #007bff transparent #007bff transparent;
+    animation: loading-dual-ring 1.2s linear infinite; }
+
+.loading-dual-ring-small {
+  display: inline-block;
+  width: 32px;
+  height: 32px; }
+  .loading-dual-ring-small:after {
+    content: " ";
+    display: block;
+    width: 23px;
+    height: 23px;
+    margin: 1px;
+    border-radius: 50%;
+    border: 2.5px solid #007bff;
+    border-color: #007bff transparent #007bff transparent;
+    animation: loading-dual-ring 1.2s linear infinite; }
+
+@keyframes loading-dual-ring {
+  0% {
+    transform: rotate(0deg); }
+  100% {
+    transform: rotate(360deg); } }
+.loading-dual-ring-center-screen {
+  position: fixed;
+  top: 50%;
+  left: 50%;
+  margin-top: -32px;
+  margin-left: -32px; }
+
+.black-overlay {
+  position: fixed;
+  /* Sit on top of the page content */
+  display: none;
+  /* Hidden by default */
+  width: 100%;
+  /* Full width (cover the whole page) */
+  height: 100%;
+  /* Full height (cover the whole page) */
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background-color: rgba(0, 0, 0, 0.5);
+  /* Black background with opacity */
+  z-index: 2;
+  /* Specify a stack order in case you're using a different order for other elements */
+  cursor: pointer;
+  /* Add a pointer on hover */ }
+
+.video-gallery .card-wrapper {
+  padding: 0.4rem;
+  margin-bottom: .5rem; }
+.video-gallery .card .card-body {
+  padding: .75rem; }
+.video-gallery .card .card-text {
+  font-size: 10pt;
+  margin-bottom: .5rem; }
+.video-gallery .card .card-title {
+  font-size: 11pt;
+  margin-bottom: .5rem; }
+  .video-gallery .card .card-title .badge {
+    font-size: 8pt; }
+.video-gallery .card .card-footer {
+  padding: .5rem .75rem; }
+.video-gallery .card .card-more {
+  margin-right: -0.25rem; }
+  .video-gallery .card .card-more:hover {
+    text-decoration: none; }
+.video-gallery .card .progress {
+  width: 100px; }
+.video-gallery .video-icon-yes {
+  color: #007bff; }
+.video-gallery .video-icon-no {
+  color: #dddddd; }
+
+.alert-card {
+  max-width: 35rem;
+  margin: 2rem 0; }
+
+.no-asterisk .asteriskField {
+  display: none; }
+
+.modal-field-error {
+  margin: 0.5rem 0;
+  padding: 0.5rem 0; }
+  .modal-field-error ul {
+    margin: 0; }
+
+.star-rating {
+  display: inline-block;
+  margin-bottom: 0.5rem; }
+
+/*# sourceMappingURL=style.css.map */
--- a/app/YtManagerApp/static/YtManagerApp/css/style.css.map
+++ b/app/YtManagerApp/static/YtManagerApp/css/style.css.map
@@ -0,0 +1,7 @@
+{
+"version": 3,
+"mappings": "AAEA,UAAW;EACP,aAAa,EAAE,IAAI;;AAGvB,YAAa;EACT,QAAQ,EAAE,KAAK;EACf,IAAI,EAAE,CAAC;EACP,KAAK,EAAE,CAAC;EACR,MAAM,EAAE,CAAC;EACT,MAAM,EAAE,IAAI;EACZ,WAAW,EAAE,IAAI;EACjB,OAAO,EAAE,SAAS;EAClB,OAAO,EAAE,IAAI;EACb,aAAa,EAAE,MAAM;EACrB,SAAS,EAAE,IAAI;;AAqBnB,uBAAuB;AACvB,kBAAmB;EAlBf,OAAO,EAAE,YAAY;EACrB,KAAK,EAAE,IAAa;EACpB,MAAM,EAAE,IAAa;EAErB,wBAAQ;IACJ,OAAO,EAAE,GAAG;IACZ,OAAO,EAAE,KAAK;IACd,KAAK,EAAE,IAAa;IACpB,MAAM,EAAE,IAAa;IACrB,MAAM,EAAE,GAAG;IACX,aAAa,EAAE,GAAG;IAClB,MAAM,EAAE,iBAAkC;IAC1C,YAAY,EAAE,uCAAmD;IACjE,SAAS,EAAE,sCAAsC;;AASzD,wBAAyB;EAtBrB,OAAO,EAAE,YAAY;EACrB,KAAK,EAAE,IAAa;EACpB,MAAM,EAAE,IAAa;EAErB,8BAAQ;IACJ,OAAO,EAAE,GAAG;IACZ,OAAO,EAAE,KAAK;IACd,KAAK,EAAE,IAAa;IACpB,MAAM,EAAE,IAAa;IACrB,MAAM,EAAE,GAAG;IACX,aAAa,EAAE,GAAG;IAClB,MAAM,EAAE,mBAAkC;IAC1C,YAAY,EAAE,uCAAmD;IACjE,SAAS,EAAE,sCAAsC;;AAazD,4BAOC;EANG,EAAG;IACC,SAAS,EAAE,YAAY;EAE3B,IAAK;IACD,SAAS,EAAE,cAAc;AAIjC,gCAAiC;EAC7B,QAAQ,EAAE,KAAK;EACf,GAAG,EAAE,GAAG;EACR,IAAI,EAAE,GAAG;EACT,UAAU,EAAE,KAAK;EACjB,WAAW,EAAE,KAAK;;AAGtB,cAAe;EACX,QAAQ,EAAE,KAAK;EAAE,oCAAoC;EACrD,OAAO,EAAE,IAAI;EAAE,uBAAuB;EACtC,KAAK,EAAE,IAAI;EAAE,uCAAuC;EACpD,MAAM,EAAE,IAAI;EAAE,wCAAwC;EACtD,GAAG,EAAE,CAAC;EACN,IAAI,EAAE,CAAC;EACP,KAAK,EAAE,CAAC;EACR,MAAM,EAAE,CAAC;EACT,gBAAgB,EAAE,kBAAe;EAAE,mCAAmC;EACtE,OAAO,EAAE,CAAC;EAAE,qFAAqF;EACjG,MAAM,EAAE,OAAO;EAAE,4BAA4B;;AAI7C,4BAAc;EACV,OAAO,EAAE,MAAM;EACf,aAAa,EAAE,KAAK;AAGpB,+BAAW;EACP,OAAO,EAAE,MAAM;AAEnB,+BAAW;EACP,SAAS,EAAE,IAAI;EACf,aAAa,EAAE,KAAK;AAExB,gCAAY;EACR,SAAS,EAAE,IAAI;EACf,aAAa,EAAE,KAAK;EAEpB,uCAAO;IACH,SAAS,EAAE,GAAG;AAGtB,iCAAa;EACT,OAAO,EAAE,YAAY;AAGzB,+BAAW;EACP,YAAY,EAAE,QAAQ;EACtB,qCAAQ;IACJ,eAAe,EAAE,IAAI;AAO7B,8BAAU;EACN,KAAK,EAAE,KAAK;AAKpB,8BAAgB;EACZ,KAAK,EAvHE,OAAO;AAyHlB,6BAAe;EACX,KAAK,EAAE,OAAO;;AAItB,WAAY;EACR,SAAS,EAAE,KAAK;EAChB,MAAM,EAAE,MAAM;;AAId,2BAAe;EACX,OAAO,EAAE,IAAI;;AAIrB,kBAAmB;EACf,MAAM,EAAE,QAAQ;EAChB,OAAO,EAAE,QAAQ;EAEjB,qBAAG;IACC,MAAM,EAAE,CAAC;;AAIjB,YAAa;EACT,OAAO,EAAE,YAAY;EACrB,aAAa,EAAE,MAAM",
+"sources": ["style.scss"],
+"names": [],
+"file": "style.css"
+}
--- a/app/YtManagerApp/static/YtManagerApp/css/style.scss
+++ b/app/YtManagerApp/static/YtManagerApp/css/style.scss
@@ -0,0 +1,150 @@
+$accent-color: #007bff;
+
+#main_body {
+    margin-bottom: 4rem;
+}
+
+#main_footer {
+    position: fixed;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    height: 2rem;
+    line-height: 2rem;
+    padding: 0rem 1rem;
+    display: flex;
+    align-content: center;
+    font-size: 10pt;
+}
+
+@mixin loading-dual-ring($scale : 1) {
+    display: inline-block;
+    width: $scale * 64px;
+    height: $scale * 64px;
+
+    &:after {
+        content: " ";
+        display: block;
+        width: $scale * 46px;
+        height: $scale * 46px;
+        margin: 1px;
+        border-radius: 50%;
+        border: ($scale * 5px) solid $accent-color;
+        border-color: $accent-color transparent $accent-color transparent;
+        animation: loading-dual-ring 1.2s linear infinite;
+    }
+}
+
+/* Loading animation */
+.loading-dual-ring {
+    @include loading-dual-ring(1.0);
+}
+
+.loading-dual-ring-small {
+    @include loading-dual-ring(0.5);
+}
+
+@keyframes loading-dual-ring {
+    0% {
+        transform: rotate(0deg);
+    }
+    100% {
+        transform: rotate(360deg);
+    }
+}
+
+.loading-dual-ring-center-screen {
+    position: fixed;
+    top: 50%;
+    left: 50%;
+    margin-top: -32px;
+    margin-left: -32px;
+}
+
+.black-overlay {
+    position: fixed; /* Sit on top of the page content */
+    display: none; /* Hidden by default */
+    width: 100%; /* Full width (cover the whole page) */
+    height: 100%; /* Full height (cover the whole page) */
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    background-color: rgba(0,0,0,0.5); /* Black background with opacity */
+    z-index: 2; /* Specify a stack order in case you're using a different order for other elements */
+    cursor: pointer; /* Add a pointer on hover */
+}
+
+.video-gallery {
+    .card-wrapper {
+        padding: 0.4rem;
+        margin-bottom: .5rem;
+    }
+    .card {
+        .card-body {
+            padding: .75rem;
+        }
+        .card-text {
+            font-size: 10pt;
+            margin-bottom: .5rem;
+        }
+        .card-title {
+            font-size: 11pt;
+            margin-bottom: .5rem;
+
+            .badge {
+                font-size: 8pt;
+            }
+        }
+        .card-footer {
+            padding: .5rem .75rem;
+        }
+
+        .card-more {
+            margin-right: -0.25rem;
+            &:hover {
+                text-decoration: none;
+            }
+        }
+
+        .card-img-top {
+        }
+
+        .progress {
+            width: 100px;
+        }
+
+    }
+
+    .video-icon-yes {
+        color: $accent-color;
+    }
+    .video-icon-no {
+        color: #dddddd;
+    }
+}
+
+.alert-card {
+    max-width: 35rem;
+    margin: 2rem 0;
+}
+
+.no-asterisk {
+    .asteriskField {
+        display: none;
+    }
+}
+
+.modal-field-error {
+    margin: 0.5rem 0;
+    padding: 0.5rem 0;
+
+    ul {
+        margin: 0;
+    }
+}
+
+.star-rating {
+    display: inline-block;
+    margin-bottom: 0.5rem;
+}
--- a/app/YtManagerApp/static/YtManagerApp/img/baseline-folder-24px.svg
+++ b/app/YtManagerApp/static/YtManagerApp/img/baseline-folder-24px.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M10 4H4c-1.1 0-1.99.9-1.99 2L2 18c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V8c0-1.1-.9-2-2-2h-8l-2-2z"/><path d="M0 0h24v24H0z" fill="none"/></svg>
--- a/app/YtManagerApp/static/YtManagerApp/img/baseline-person-24px.svg
+++ b/app/YtManagerApp/static/YtManagerApp/img/baseline-person-24px.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M12 12c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm0 2c-2.67 0-8 1.34-8 4v2h16v-2c0-2.66-5.33-4-8-4z"/><path d="M0 0h24v24H0z" fill="none"/></svg>
--- a/app/YtManagerApp/static/YtManagerApp/import/typicons/LICENCE.md
+++ b/app/YtManagerApp/static/YtManagerApp/import/typicons/LICENCE.md
@@ -0,0 +1,92 @@
+Copyright (c) 2014, Stephen Hutchings (http://www.s-ings.com/).
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+
+This license is copied below, and is also available with a FAQ at: http://scripts.sil.org/OFL
+
+SIL OPEN FONT LICENSE
+
+Version 1.1 - 26 February 2007
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded,
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting — in part or in whole — any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
--- a/app/YtManagerApp/static/YtManagerApp/import/typicons/demo.html
+++ b/app/YtManagerApp/static/YtManagerApp/import/typicons/demo.html
--- a/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.css
+++ b/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.css
--- a/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.eot
+++ b/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.eot
--- a/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.min.css
+++ b/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.min.css
--- a/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.svg
+++ b/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.svg
--- a/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.ttf
+++ b/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.ttf
--- a/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.woff
+++ b/app/YtManagerApp/static/YtManagerApp/import/typicons/typicons.woff
--- a/app/YtManagerApp/templates/YtManagerApp/controls/folder_create_modal.html
+++ b/app/YtManagerApp/templates/YtManagerApp/controls/folder_create_modal.html
@@ -0,0 +1,21 @@
+{% extends 'YtManagerApp/controls/modal.html' %}
+{% load crispy_forms_tags %}
+
+{% block modal_title %}
+    New folder
+{% endblock modal_title %}
+
+{% block modal_content %}
+    <form action="{% url 'modal_create_folder' %}" method="post">
+        {{ block.super }}
+    </form>
+{% endblock %}
+
+{% block modal_body %}
+    {% crispy form %}
+{% endblock modal_body %}
+
+{% block modal_footer %}
+    <input class="btn btn-primary" type="submit" value="Create">
+    <input class="btn btn-secondary" type="button" value="Cancel" data-dismiss="modal" aria-label="Cancel">
+{% endblock modal_footer %}
--- a/app/YtManagerApp/templates/YtManagerApp/controls/folder_delete_modal.html
+++ b/app/YtManagerApp/templates/YtManagerApp/controls/folder_delete_modal.html
@@ -0,0 +1,23 @@
+{% extends 'YtManagerApp/controls/modal.html' %}
+{% load crispy_forms_tags %}
+
+{% block modal_title %}
+    Delete folder
+{% endblock modal_title %}
+
+{% block modal_content %}
+    <form action="{% url 'modal_delete_folder' object.id %}" method="post">
+        {% csrf_token %}
+        {{ block.super }}
+    </form>
+{% endblock %}
+
+{% block modal_body %}
+    <p>Are you sure you want to delete folder &quot;{{ object }}&quot; and all its subfolders?</p>
+    {{ form | crispy }}
+{% endblock modal_body %}
+
+{% block modal_footer %}
+    <input class="btn btn-danger" type="submit" value="Delete" aria-label="Delete">
+    <input class="btn btn-secondary" type="button" value="Cancel" data-dismiss="modal" aria-label="Cancel">
+{% endblock modal_footer %}
--- a/app/YtManagerApp/templates/YtManagerApp/controls/folder_update_modal.html
+++ b/app/YtManagerApp/templates/YtManagerApp/controls/folder_update_modal.html
@@ -0,0 +1,21 @@
+{% extends 'YtManagerApp/controls/modal.html' %}
+{% load crispy_forms_tags %}
+
+{% block modal_title %}
+    Edit folder
+{% endblock modal_title %}
+
+{% block modal_content %}
+    <form action="{% url 'modal_update_folder' form.instance.pk %}" method="post">
+        {{ block.super }}
+    </form>
+{% endblock %}
+
+{% block modal_body %}
+    {% crispy form %}
+{% endblock modal_body %}
+
+{% block modal_footer %}
+    <input class="btn btn-primary" type="submit" value="Save" aria-label="Save">
+    <input class="btn btn-secondary" type="button" value="Cancel" data-dismiss="modal" aria-label="Cancel">
+{% endblock modal_footer %}
--- a/app/YtManagerApp/templates/YtManagerApp/controls/modal.html
+++ b/app/YtManagerApp/templates/YtManagerApp/controls/modal.html
@@ -0,0 +1,43 @@
+{% block modal_stylesheets %}
+{% endblock %}
+
+<div id="{{ modal_id }}" class="modal {{ modal_classes }}" tabindex="-1" role="dialog">
+    <div class="modal-dialog {{ modal_dialog_classes }}" role="document">
+        <div class="modal-content">
+            {% block modal_content %}
+
+                {% block modal_header_wrapper %}
+                    <div class="modal-header">
+                        {% block modal_header %}
+                            <h5 id="{{ modal_id }}_Title" class="modal-title">
+                                {% block modal_title %}{{ modal_title }}{% endblock modal_title %}
+                            </h5>
+                            <button type="button" class="close" data-dismiss="modal" aria-label="Close">
+                                <span aria-hidden="true">&times;</span>
+                            </button>
+                        {% endblock modal_header %}
+                    </div>
+                {% endblock modal_header_wrapper %}
+
+                {% block modal_body_wrapper %}
+                    <div class="modal-body">
+                        {% block modal_body %}
+                        {% endblock %}
+                    </div>
+                {% endblock modal_body_wrapper %}
+
+                {% block modal_footer_wrapper %}
+                    <div class="modal-footer">
+                        <div id="modal-loading-ring" class="loading-dual-ring-small mr-auto" style="display: none;"></div>
+                        {% block modal_footer %}
+                        {% endblock modal_footer %}
+                    </div>
+                {% endblock modal_footer_wrapper %}
+
+            {% endblock modal_content %}
+        </div>
+    </div>
+</div>
+
+{% block modal_scripts %}
+{% endblock %}
--- a/app/YtManagerApp/templates/YtManagerApp/controls/subscription_create_modal.html
+++ b/app/YtManagerApp/templates/YtManagerApp/controls/subscription_create_modal.html
@@ -0,0 +1,21 @@
+{% extends 'YtManagerApp/controls/modal.html' %}
+{% load crispy_forms_tags %}
+
+{% block modal_title %}
+    New subscription
+{% endblock modal_title %}
+
+{% block modal_content %}
+    <form action="{% url 'modal_create_subscription' %}" method="post">
+        {{ block.super }}
+    </form>
+{% endblock %}
+
+{% block modal_body %}
+    {% crispy form %}
+{% endblock modal_body %}
+
+{% block modal_footer %}
+    <input class="btn btn-primary" type="submit" value="Create">
+    <input class="btn btn-secondary" type="button" value="Cancel" data-dismiss="modal" aria-label="Cancel">
+{% endblock modal_footer %}
--- a/app/YtManagerApp/templates/YtManagerApp/controls/subscription_delete_modal.html
+++ b/app/YtManagerApp/templates/YtManagerApp/controls/subscription_delete_modal.html
@@ -0,0 +1,23 @@
+{% extends 'YtManagerApp/controls/modal.html' %}
+{% load crispy_forms_tags %}
+
+{% block modal_title %}
+    Delete subscription
+{% endblock modal_title %}
+
+{% block modal_content %}
+    <form action="{% url 'modal_delete_subscription' object.id %}" method="post">
+        {% csrf_token %}
+        {{ block.super }}
+    </form>
+{% endblock %}
+
+{% block modal_body %}
+    <p>Are you sure you want to delete subscription &quot;{{ object }}&quot;?</p>
+    {{ form | crispy }}
+{% endblock modal_body %}
+
+{% block modal_footer %}
+    <input class="btn btn-danger" type="submit" value="Delete" aria-label="Delete">
+    <input class="btn btn-secondary" type="button" value="Cancel" data-dismiss="modal" aria-label="Cancel">
+{% endblock modal_footer %}
--- a/app/YtManagerApp/templates/YtManagerApp/controls/subscription_update_modal.html
+++ b/app/YtManagerApp/templates/YtManagerApp/controls/subscription_update_modal.html
@@ -0,0 +1,21 @@
+{% extends 'YtManagerApp/controls/modal.html' %}
+{% load crispy_forms_tags %}
+
+{% block modal_title %}
+    Edit subscription
+{% endblock modal_title %}
+
+{% block modal_content %}
+    <form action="{% url 'modal_update_subscription' form.instance.pk %}" method="post">
+        {{ block.super }}
+    </form>
+{% endblock %}
+
+{% block modal_body %}
+    {% crispy form %}
+{% endblock modal_body %}
+
+{% block modal_footer %}
+    <input class="btn btn-primary" type="submit" value="Save" aria-label="Save">
+    <input class="btn btn-secondary" type="button" value="Cancel" data-dismiss="modal" aria-label="Cancel">
+{% endblock modal_footer %}
--- a/app/YtManagerApp/templates/YtManagerApp/index.html
+++ b/app/YtManagerApp/templates/YtManagerApp/index.html
@@ -0,0 +1,74 @@
+{% extends "YtManagerApp/master_default.html" %}
+{% load static %}
+{% load crispy_forms_tags %}
+
+{% block stylesheets %}
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/jstree/3.2.1/themes/default/style.min.css" />
+{% endblock %}
+
+{% block scripts %}
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/jstree/3.2.1/jstree.min.js"></script>
+    <script>
+        {% include 'YtManagerApp/js/index.js' %}
+    </script>
+{% endblock %}
+
+{% block body %}
+
+    <div id="modal-wrapper">
+        <div id="modal-loading" class="black-overlay">
+            <div class="loading-dual-ring loading-dual-ring-center-screen"></div>
+        </div>
+
+        <div id="modal-wrapper">
+        </div>
+    </div>
+
+    <div class="row">
+
+        <div class="col-3">
+            {# Tree toolbar #}
+            <div class="btn-toolbar" role="toolbar" aria-label="Subscriptions toolbar">
+                <div class="btn-group btn-group-sm mr-2" role="group">
+                    <button id="btn_create_sub" type="button" class="btn btn-secondary" >
+                        <span class="typcn typcn-plus" aria-hidden="true"></span>
+                    </button>
+                    <button id="btn_create_folder" type="button" class="btn btn-secondary">
+                        <span class="typcn typcn-folder-add" aria-hidden="true"></span>
+                    </button>
+                </div>
+                <div class="btn-group btn-group-sm mr-2" role="group">
+                    <button id="btn_edit_node" type="button" class="btn btn-secondary" >
+                        <span class="typcn typcn-edit" aria-hidden="true"></span>
+                    </button>
+                    <button id="btn_delete_node" type="button" class="btn btn-secondary" >
+                        <span class="typcn typcn-trash" aria-hidden="true"></span>
+                    </button>
+                </div>
+            </div>
+
+            <div id="tree-wrapper">
+                <div class="d-flex">
+                    <div class="loading-dual-ring mx-auto my-5"></div>
+                </div>
+            </div>
+        </div>
+
+        <div class="col-9">
+            {# Video toolbar #}
+            <div class="btn-toolbar" role="toolbar" aria-label="Subscriptions toolbar">
+                {% crispy filter_form %}
+            </div>
+
+            <div id="videos-wrapper">
+            </div>
+
+            <div id="videos-loading" style="display: none">
+                <div class="d-flex">
+                    <div class="loading-dual-ring mx-auto my-5"></div>
+                </div>
+            </div>
+        </div>
+    </div>
+
+{% endblock %}
--- a/app/YtManagerApp/templates/YtManagerApp/index_unauthenticated.html
+++ b/app/YtManagerApp/templates/YtManagerApp/index_unauthenticated.html
@@ -0,0 +1,9 @@
+{% extends "YtManagerApp/master_default.html" %}
+{% load static %}
+
+{% block body %}
+
+    <h1>Hello</h1>
+    <h2>Please log in to continue</h2>
+
+{% endblock %}
--- a/app/YtManagerApp/templates/YtManagerApp/index_videos.html
+++ b/app/YtManagerApp/templates/YtManagerApp/index_videos.html
@@ -0,0 +1,61 @@
+{% load humanize %}
+{% load ratings %}
+
+<div class="video-gallery container-fluid">
+    <div class="row">
+        {% for video in videos %}
+            <div class="card-wrapper col-12 col-sm-6 col-lg-4 col-xl-3 d-flex align-items-stretch">
+                <div class="card mx-auto">
+                    <img class="card-img-top" src="{{ video.icon_best }}" alt="Thumbnail">
+                    <div class="card-body">
+                        <h5 class="card-title">
+                            {% if not video.watched %}
+                            <sup class="badge badge-primary">New</sup>
+                            {% endif %}
+                            {{ video.name }}
+                        </h5>
+                        <p class="card-text small text-muted">
+                            <span>{{ video.views | intcomma }} views</span>
+                            <span>&#x2022;</span>
+                            <span>{{ video.publish_date | naturaltime }}</span>
+                        </p>
+                        <p class="card-text">{{ video.description | truncatechars:120 }}</p>
+                    </div>
+                    <div class="card-footer dropdown show">
+                        <span class="typcn typcn-eye {{ video.watched | yesno:"video-icon-yes,video-icon-no" }}"
+                              title="{{ video.watched | yesno:"Watched,Not watched" }}"></span>
+                        <span class="typcn typcn-download {{ video.downloaded_path | yesno:"video-icon-yes,,video-icon-no" }}"
+                              title="{{ video.downloaded_path | yesno:"Downloaded,,Not downloaded" }}"></span>
+                        <small class="text-muted">{{ video.publish_date }}</small>
+                        <a class="card-more float-right text-muted"
+                           href="#" role="button" id="dropdownMenuLink"
+                           data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                            <span class="typcn typcn-cog"></span>
+                        </a>
+                        <div class="dropdown-menu" aria-labelledby="dropdownMenuLink">
+                            {% if video.watched %}
+                                <a class="dropdown-item ajax-link" href="#" data-post-url="{% url 'ajax_action_mark_video_unwatched' video.id %}">
+                                    Mark not watched
+                                </a>
+                            {% else %}
+                                <a class="dropdown-item ajax-link" href="#" data-post-url="{% url 'ajax_action_mark_video_watched' video.id %}">
+                                    Mark watched
+                                </a>
+                            {% endif %}
+
+                            {% if video.downloaded_path %}
+                                <a class="dropdown-item ajax-link" href="#" data-post-url="{% url 'ajax_action_delete_video_files' video.id %}">
+                                    Delete downloaded
+                                </a>
+                            {% else %}
+                                <a class="dropdown-item ajax-link" href="#" data-post-url="{% url 'ajax_action_download_video_files' video.id %}" >
+                                    Download
+                                </a>
+                            {% endif %}
+                        </div>
+                    </div>
+                </div>
+            </div>
+        {% endfor %}
+    </div>
+</div>
--- a/app/YtManagerApp/templates/YtManagerApp/js/common.js
+++ b/app/YtManagerApp/templates/YtManagerApp/js/common.js
@@ -0,0 +1,185 @@
+class AjaxModal
+{
+    constructor(url)
+    {
+        this.wrapper = $("#modal-wrapper");
+        this.loading = $("#modal-loading");
+        this.url = url;
+        this.modal = null;
+        this.form = null;
+        this.submitCallback = null;
+        this.modalLoadingRing = null;
+    }
+
+    setSubmitCallback(callback) {
+        this.submitCallback = callback;
+    }
+
+    _showLoading() {
+        this.loading.fadeIn(500);
+    }
+
+    _hideLoading() {
+        this.loading.fadeOut(100);
+    }
+
+    _showModal() {
+        if (this.modal != null)
+            this.modal.modal();
+    }
+
+    _hideModal() {
+        if (this.modal != null)
+            this.modal.modal('hide');
+    }
+
+    _load(result) {
+        this.wrapper.html(result);
+
+        this.modal = this.wrapper.find('.modal');
+        this.form = this.wrapper.find('form');
+        this.modalLoadingRing = this.wrapper.find('#modal-loading-ring');
+
+        let pThis = this;
+        this.form.submit(function(e) {
+            pThis._submit(e);
+        })
+    }
+
+    _loadFailed() {
+        this.wrapper.html('<div class="alert alert-danger">An error occurred while displaying the dialog!</div>');
+    }
+
+    _submit(e) {
+        let pThis = this;
+        let url = this.form.attr('action');
+        $.post(url, this.form.serialize())
+            .done(function(result) {
+                pThis._submitDone(result);
+            })
+            .fail(function() {
+                pThis._submitFailed();
+            })
+            .always(function() {
+                pThis.modalLoadingRing.fadeOut(100);
+                pThis.wrapper.find(":input").prop("disabled", false);
+            });
+
+        this.modalLoadingRing.fadeIn(200);
+        this.wrapper.find(":input").prop("disabled", true);
+
+        e.preventDefault();
+    }
+
+    _submitDone(result) {
+        // Clear old errors first
+        this.form.find('.modal-field-error').remove();
+
+        if (!result.hasOwnProperty('success')) {
+            this._submitInvalidResponse();
+            return;
+        }
+
+        if (result.success) {
+            this._hideModal();
+            if (this.submitCallback != null)
+                this.submitCallback();
+        }
+        else {
+            if (!result.hasOwnProperty('errors')) {
+                this._submitInvalidResponse();
+                return;
+            }
+
+            for (let field in result.errors)
+                if (result.errors.hasOwnProperty(field))
+                {
+                    let errorsArray = result.errors[field];
+                    let errorsConcat = "<div class=\"alert alert-danger modal-field-error\"><ul>";
+
+                    for(let error of errorsArray) {
+                        errorsConcat += `<li>${error.message}</li>`;
+                    }
+                    errorsConcat += '</ul></div>';
+
+                    if (field === '__all__')
+                        this.form.find('.modal-body').append(errorsConcat);
+                    else
+                        this.form.find(`[name='${field}']`).after(errorsConcat);
+                }
+
+            let errorsHtml = '';
+
+            let err = this.modal.find('#__modal_error');
+            if (err.length) {
+                err.html('An error occurred');
+            }
+            else {
+                this.modal.find('.modal-body').append(errorsHtml)
+            }
+        }
+    }
+
+    _submitFailed() {
+        // Clear old errors first
+        this.form.find('.modal-field-error').remove();
+        this.form.find('.modal-body')
+            .append(`<div class="alert alert-danger modal-field-error">An error occurred while processing request!</div>`);
+    }
+
+    _submitInvalidResponse() {
+        // Clear old errors first
+        this.form.find('.modal-field-error').remove();
+        this.form.find('.modal-body')
+            .append(`<div class="alert alert-danger modal-field-error">Invalid server response!</div>`);
+    }
+
+    loadAndShow()
+    {
+        let pThis = this;
+        this._showLoading();
+
+        $.get(this.url)
+            .done(function (result) {
+                pThis._load(result);
+                pThis._showModal();
+            })
+            .fail(function () {
+                pThis._loadFailed();
+            })
+            .always(function() {
+                pThis._hideLoading();
+            });
+    }
+}
+
+function syncNow() {
+    $.post("{% url 'ajax_action_sync_now' %}", {
+        csrfmiddlewaretoken: '{{ csrf_token }}'
+    });
+}
+
+function ajaxLink_Clicked() {
+    let url_post = $(this).data('post-url');
+    let url_get = $(this).data('get-url');
+
+    if (url_post != null) {
+        $.post(url_post, {
+            csrfmiddlewaretoken: '{{ csrf_token }}'
+        });
+    }
+    else if (url_get != null) {
+        $.get(url_get, {
+            csrfmiddlewaretoken: '{{ csrf_token }}'
+        });
+    }
+}
+
+///
+/// Initialization
+///
+$(document).ready(function ()
+{
+    $(".ajax-link").on("click", ajaxLink_Clicked);
+    $("#btn_sync_now").on("click", syncNow);
+});
--- a/app/YtManagerApp/templates/YtManagerApp/js/index.js
+++ b/app/YtManagerApp/templates/YtManagerApp/js/index.js
@@ -0,0 +1,189 @@
+function treeNode_Edit()
+{
+    let selectedNodes = $("#tree-wrapper").jstree('get_selected', true);
+    if (selectedNodes.length === 1)
+    {
+        let node = selectedNodes[0];
+
+        if (node.type === 'folder') {
+            let id = node.id.replace('folder', '');
+            let modal = new AjaxModal("{% url 'modal_update_folder' 98765 %}".replace('98765', id));
+            modal.setSubmitCallback(tree_Refresh);
+            modal.loadAndShow();
+        }
+        else {
+            let id = node.id.replace('sub', '');
+            let modal = new AjaxModal("{% url 'modal_update_subscription' 98765 %}".replace('98765', id));
+            modal.setSubmitCallback(tree_Refresh);
+            modal.loadAndShow();
+        }
+    }
+}
+
+function treeNode_Delete()
+{
+    let selectedNodes = $("#tree-wrapper").jstree('get_selected', true);
+    if (selectedNodes.length === 1)
+    {
+        let node = selectedNodes[0];
+
+        if (node.type === 'folder') {
+            let id = node.id.replace('folder', '');
+            let modal = new AjaxModal("{% url 'modal_delete_folder' 98765 %}".replace('98765', id));
+            modal.setSubmitCallback(tree_Refresh);
+            modal.loadAndShow();
+        }
+        else {
+            let id = node.id.replace('sub', '');
+            let modal = new AjaxModal("{% url 'modal_delete_subscription' 98765 %}".replace('98765', id));
+            modal.setSubmitCallback(tree_Refresh);
+            modal.loadAndShow();
+        }
+    }
+}
+
+function tree_Initialize()
+{
+    let treeWrapper = $("#tree-wrapper");
+    treeWrapper.jstree({
+        core : {
+            data : {
+                url : "{% url 'ajax_get_tree' %}"
+            },
+            check_callback : tree_ValidateChange,
+            themes : {
+                dots : false
+            },
+        },
+        types : {
+            folder : {
+                icon : "typcn typcn-folder"
+            },
+            sub : {
+                icon : "typcn typcn-user",
+                max_depth : 0
+            }
+        },
+        plugins : [ "types", "wholerow", "dnd" ]
+    });
+    treeWrapper.on("changed.jstree", tree_OnSelectionChanged);
+}
+
+function tree_Refresh()
+{
+    $("#tree-wrapper").jstree("refresh");
+}
+
+function tree_ValidateChange(operation, node, parent, position, more)
+{
+    if (more.dnd)
+    {
+        // create_node, rename_node, delete_node, move_node and copy_node
+        if (operation === "copy_node" || operation === "move_node")
+        {
+            if (more.ref.type === "sub")
+                return false;
+        }
+    }
+
+    return true;
+}
+
+function tree_OnSelectionChanged(e, data)
+{
+    let filterForm = $('#form_video_filter');
+    let filterForm_folderId = filterForm.find('#form_video_filter_folder_id');
+    let filterForm_subId = filterForm.find('#form_video_filter_subscription_id');
+
+    let node = data.instance.get_selected(true)[0];
+
+    // Fill folder/sub fields
+    if (node == null) {
+        filterForm_folderId.val('');
+        filterForm_subId.val('');
+    }
+    else if (node.type === 'folder') {
+        let id = node.id.replace('folder', '');
+        filterForm_folderId.val(id);
+        filterForm_subId.val('');
+    }
+    else {
+        let id = node.id.replace('sub', '');
+        filterForm_folderId.val('');
+        filterForm_subId.val(id);
+    }
+
+    videos_Reload();
+}
+
+function videos_Reload()
+{
+    videos_Submit.call($('#form_video_filter'));
+}
+
+let videos_timeout = null;
+
+function videos_ReloadWithTimer()
+{
+    clearTimeout(videos_timeout);
+    videos_timeout = setTimeout(function()
+    {
+        videos_Submit.call($('#form_video_filter'));
+        videos_timeout = null;
+    }, 200);
+}
+
+function videos_Submit(e)
+{
+    let loadingDiv = $('#videos-loading');
+    loadingDiv.fadeIn(300);
+
+    let form = $(this);
+    let url = form.attr('action');
+
+    $.post(url, form.serialize())
+        .done(function(result) {
+            $("#videos-wrapper").html(result);
+            $(".ajax-link").on("click", ajaxLink_Clicked);
+        })
+        .fail(function() {
+            $("#videos-wrapper").html('<div class="alert alert-danger">An error occurred while retrieving the video list!</div>');
+        })
+        .always(function() {
+            loadingDiv.fadeOut(100);
+        });
+
+    if (e != null)
+        e.preventDefault();
+}
+
+///
+/// Initialization
+///
+$(document).ready(function ()
+{
+    tree_Initialize();
+
+    // Subscription toolbar
+    $("#btn_create_sub").on("click", function () {
+        let modal = new AjaxModal("{% url 'modal_create_subscription' %}");
+        modal.setSubmitCallback(tree_Refresh);
+        modal.loadAndShow();
+    });
+    $("#btn_create_folder").on("click", function () {
+        let modal = new AjaxModal("{% url 'modal_create_folder' %}");
+        modal.setSubmitCallback(tree_Refresh);
+        modal.loadAndShow();
+    });
+    $("#btn_edit_node").on("click", treeNode_Edit);
+    $("#btn_delete_node").on("click", treeNode_Delete);
+
+    // Videos filters
+    let filters_form = $("#form_video_filter");
+    filters_form.submit(videos_Submit);
+    filters_form.find('input[name=query]').on('change', videos_ReloadWithTimer);
+    filters_form.find('select[name=sort]').on('change', videos_ReloadWithTimer);
+    filters_form.find('select[name=show_watched]').on('change', videos_ReloadWithTimer);
+    filters_form.find('select[name=show_downloaded]').on('change', videos_ReloadWithTimer);
+    videos_Reload();
+});
--- a/app/YtManagerApp/templates/YtManagerApp/master_default.html
+++ b/app/YtManagerApp/templates/YtManagerApp/master_default.html
@@ -0,0 +1,76 @@
+{% load static %}
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta charset="utf-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+        <title>{% block title %}YouTube Subscription Manager{% endblock %}</title>
+
+        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
+        <link rel="stylesheet" href="{% static 'YtManagerApp/import/typicons/typicons.min.css' %}" />
+        <link rel="stylesheet" href="{% static 'YtManagerApp/css/style.css' %}">
+        {% block stylesheets %}
+        {% endblock %}
+    </head>
+    <body>
+        <script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
+        <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
+        <script>
+            {% include 'YtManagerApp/js/common.js' %}
+        </script>
+        {% block scripts %}
+        {% endblock %}
+        
+        <nav class="navbar navbar-expand-lg navbar-light bg-light">
+            <a class="navbar-brand" href="{% url 'home' %}">YouTube Manager</a>
+            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent"
+                    aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+
+            <div class="collapse navbar-collapse" id="navbarSupportedContent">
+                <ul class="navbar-nav ml-auto">
+                    {% if request.user.is_authenticated %}
+                        <li class="nav-item dropdown">
+                            <a class="nav-link dropdown-toggle" href="#" id="userDropdown" role="button"
+                               data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+                                Welcome,
+                                {% if request.user.first_name %}
+                                    {{ request.user.first_name }}
+                                {% else %}
+                                    {{ request.user.username }}
+                                {% endif %}
+                            </a>
+                            <div class="dropdown-menu dropdown-menu-right" aria-labelledby="userDropdown">
+                                <a class="dropdown-item" href="{% url 'settings' %}">Settings</a>
+                                <div class="dropdown-divider"></div>
+                                <a class="dropdown-item" href="{% url 'logout' %}">Log out</a>
+                            </div>
+                        </li>
+                    {% else %}
+                        <li class="nav-item">
+                            <a class="nav-link" href="{% url 'login' %}">Login</a>
+                        </li>
+                        <li class="nav-item">
+                            <a class="nav-link" href="{% url 'register' %}">Register</a>
+                        </li>
+                    {% endif %}
+                </ul>
+            </div>
+
+        </nav>
+
+        <div id="main_body" class="container-fluid">
+            {% block body %}
+            {% endblock %}
+        </div>
+
+        <footer id="main_footer" class="footer bg-light">
+            <span class="ml-auto text-muted">Last synchronized: just now</span>
+            <button id="btn_sync_now" class="btn btn-sm btn-light" title="Synchronize now!">
+                <span class="typcn typcn-arrow-sync" aria-hidden="true"></span>
+            </button>
+        </footer>
+    </body>
+</html>
--- a/app/YtManagerApp/templates/YtManagerApp/settings.html
+++ b/app/YtManagerApp/templates/YtManagerApp/settings.html
@@ -0,0 +1,12 @@
+{% extends "YtManagerApp/master_default.html" %}
+{% load crispy_forms_tags %}
+
+{% block body %}
+
+    <div class="container">
+        <h1>Settings</h1>
+        <p>If no value is set, the server's defaults will be used.</p>
+        {% crispy form %}
+    </div>
+
+{% endblock body %}
--- a/app/YtManagerApp/templates/registration/logged_out.html
+++ b/app/YtManagerApp/templates/registration/logged_out.html
@@ -0,0 +1,27 @@
+{% extends 'YtManagerApp/master_default.html' %}
+
+{% load static %}
+{% load crispy_forms_tags %}
+
+{% block scripts %}
+    <script>
+    
+    window.setTimeout(function(){
+        window.location.href = "/";
+    }, 3000);
+    
+    </script>
+    
+{% endblock %}
+
+{% block body %}
+
+    <div class="alert-card mx-auto">
+
+        <div class="alert alert-info" role="alert">
+            You have been logged out!
+        </div>
+
+    </div>
+
+{% endblock %}
--- a/app/YtManagerApp/templates/registration/login.html
+++ b/app/YtManagerApp/templates/registration/login.html
@@ -0,0 +1,44 @@
+{% extends 'YtManagerApp/master_default.html' %}
+
+{% load static %}
+{% load crispy_forms_tags %}
+
+{% block stylesheets %}
+    <link rel="stylesheet" href="{% static 'YtManagerApp/css/login.css' %}">
+{% endblock %}
+
+{% block body %}
+
+    <div class="login-card mx-auto">
+
+        {% if next %}
+            {% if user.is_authenticated %}
+                <div class="alert alert-warning" role="alert">
+                    Your account doesn't have access to this page. To proceed,
+                    please login with an account that has access.
+                </div>
+            {% else %}
+                <div class="alert alert-info" role="alert">
+                    Please login or register to see this page.
+                </div>
+            {% endif %}
+        {% endif %}
+
+        <h5>Login</h5>
+
+        <form method="post" action="{% url 'login' %}">
+            {% csrf_token %}
+            <input type="hidden" name="next" value="{{ next }}"/>
+
+            {{ form | crispy }}
+
+            <div class="form-group">
+                <input class="btn btn-primary" type="submit" value="login"/>
+
+                <a class="ml-2" href="{% url 'password_reset' %}">Recover password</a>
+            </div>
+
+        </form>
+    </div>
+
+{% endblock %}
--- a/app/YtManagerApp/templates/registration/password_reset_complete.html
+++ b/app/YtManagerApp/templates/registration/password_reset_complete.html
@@ -0,0 +1,26 @@
+{% extends 'YtManagerApp/master_default.html' %}
+
+{% load static %}
+{% load crispy_forms_tags %}
+
+{% block scripts %}
+    <script>
+    
+    window.setTimeout(function(){
+        window.location.href = "/";
+    }, 5000);
+    
+    </script>
+{% endblock %}
+
+{% block body %}
+
+    <div class="alert-card mx-auto">
+
+        <div class="alert alert-info" role="alert">
+            The password has been changed!
+        </div>
+
+    </div>
+
+{% endblock %}
--- a/app/YtManagerApp/templates/registration/password_reset_confirm.html
+++ b/app/YtManagerApp/templates/registration/password_reset_confirm.html
@@ -0,0 +1,33 @@
+{% extends 'YtManagerApp/master_default.html' %}
+
+{% load static %}
+{% load crispy_forms_tags %}
+
+{% block stylesheets %}
+    <link rel="stylesheet" href="{% static 'YtManagerApp/css/login.css' %}">
+{% endblock %}
+
+{% block body %}
+
+    {% if validlink %}
+        <div class="login-card mx-auto">
+            <h5>Confirm password reset</h5>
+
+            <form method="post" action="">
+                {% csrf_token %}
+                {{ form | crispy }}
+                <div class="form-group">
+                    <input class="btn btn-primary" type="submit" value="change password"/>
+                </div>
+
+            </form>
+        </div>
+    {% else %}
+        <div class="alert-card mx-auto">
+            <div class="alert alert-danger" role="alert">
+                The password reset link was invalid, possibly because it has already been used. Please request a new password reset.
+            </div>
+        </div>
+    {% endif %}
+
+{% endblock %}
--- a/app/YtManagerApp/templates/registration/password_reset_done.html
+++ b/app/YtManagerApp/templates/registration/password_reset_done.html
@@ -0,0 +1,28 @@
+{% extends 'YtManagerApp/master_default.html' %}
+
+{% load static %}
+{% load crispy_forms_tags %}
+
+{% block scripts %}
+    <script>
+    
+    window.setTimeout(function(){
+        window.location.href = "/";
+    }, 10000);
+    
+    </script>
+    
+{% endblock %}
+
+{% block body %}
+
+    <div class="alert-card mx-auto">
+
+        <div class="alert alert-info" role="alert">
+            <p>We've emailed you instructions for resetting your password.</p>
+            <p>If they haven't arrived in a few minutes, check your spam folder.</p>
+        </div>
+
+    </div>
+
+{% endblock %}
--- a/app/YtManagerApp/templates/registration/password_reset_email.html
+++ b/app/YtManagerApp/templates/registration/password_reset_email.html
@@ -0,0 +1,2 @@
+Someone asked for password reset for email {{ email }}. Follow the link below:
+{{ protocol}}://{{ domain }}{% url 'password_reset_confirm' uidb64=uid token=token %}
--- a/app/YtManagerApp/templates/registration/password_reset_form.html
+++ b/app/YtManagerApp/templates/registration/password_reset_form.html
@@ -0,0 +1,45 @@
+{% extends 'YtManagerApp/master_default.html' %}
+
+{% load static %}
+{% load crispy_forms_tags %}
+
+{% block stylesheets %}
+    <link rel="stylesheet" href="{% static 'YtManagerApp/css/login.css' %}">
+{% endblock %}
+
+{% block body %}
+
+    <div class="login-card mx-auto">
+
+        {% if next %}
+            {% if user.is_authenticated %}
+                <div class="alert alert-warning" role="alert">
+                    Your account doesn't have access to this page. To proceed,
+                    please login with an account that has access.
+                </div>
+            {% else %}
+                <div class="alert alert-info" role="alert">
+                    Please login or register to see this page.
+                </div>
+            {% endif %}
+        {% endif %}
+
+        <h5>Password reset</h5>
+
+        <form method="post" action="{% url 'password_reset' %}">
+            {% csrf_token %}
+            <input type="hidden" name="next" value="{{ next }}"/>
+
+            {{ form | crispy }}
+
+            <p>If there is any account associated with the given e-mail address,
+                an e-mail will be sent containing the password reset link.</p>
+
+            <div class="form-group">
+                <input class="btn btn-primary" type="submit" value="reset"/>
+            </div>
+
+        </form>
+    </div>
+
+{% endblock %}
--- a/app/YtManagerApp/templates/registration/register.html
+++ b/app/YtManagerApp/templates/registration/register.html
@@ -0,0 +1,38 @@
+{% extends 'YtManagerApp/master_default.html' %}
+
+{% load static %}
+{% load crispy_forms_tags %}
+
+{% block stylesheets %}
+    <link rel="stylesheet" href="{% static 'YtManagerApp/css/login.css' %}">
+{% endblock %}
+
+{% block body %}
+
+    <div class="register-card mx-auto">
+
+        {% if next %}
+            {% if user.is_authenticated %}
+                <div class="alert alert-warning" role="alert">
+                    Your account doesn't have access to this page. To proceed,
+                    please login with an account that has access.
+                </div>
+            {% else %}
+                <div class="alert alert-info" role="alert">
+                    Please login or register to see this page.
+                </div>
+            {% endif %}
+        {% endif %}
+
+        {% if is_first_user %}
+            <div class="alert alert-info" role="alert">
+                Since this is the first user to register, it will be the system administrator.
+            </div>
+        {% endif %}
+
+        <h5>Register</h5>
+
+        {% crispy form %}
+    </div>
+
+{% endblock %}
--- a/app/YtManagerApp/templates/registration/register_done.html
+++ b/app/YtManagerApp/templates/registration/register_done.html
@@ -0,0 +1,27 @@
+{% extends 'YtManagerApp/master_default.html' %}
+
+{% load static %}
+{% load crispy_forms_tags %}
+
+{% block scripts %}
+    <script>
+    
+    window.setTimeout(function(){
+        window.location.href = "/";
+    }, 3000);
+    
+    </script>
+    
+{% endblock %}
+
+{% block body %}
+
+    <div class="alert-card mx-auto">
+
+        <div class="alert alert-info" role="alert">
+            You have registered successfully!
+        </div>
+
+    </div>
+
+{% endblock %}
--- a/app/YtManagerApp/templatetags/init.py
+++ b/app/YtManagerApp/templatetags/init.py
--- a/app/YtManagerApp/templatetags/common.py
+++ b/app/YtManagerApp/templatetags/common.py
@@ -0,0 +1,30 @@
+from django import template
+register = template.Library()
+
+
+class SetVarNode(template.Node):
+
+    def __init__(self, var_name, var_value):
+        self.var_name = var_name
+        self.var_value = var_value
+
+    def render(self, context):
+        try:
+            value = template.Variable(self.var_value).resolve(context)
+        except template.VariableDoesNotExist:
+            value = ""
+        context[self.var_name] = value
+
+        return u""
+
+
+@register.tag(name='set')
+def set_var(parser, token):
+    """
+    {% set some_var = '123' %}
+    """
+    parts = token.split_contents()
+    if len(parts) < 4:
+        raise template.TemplateSyntaxError("'set' tag must be of the form: {% set <var_name> = <var_value> %}")
+
+    return SetVarNode(parts[1], parts[3])
--- a/app/YtManagerApp/templatetags/ratings.py
+++ b/app/YtManagerApp/templatetags/ratings.py
@@ -0,0 +1,61 @@
+from django import template
+register = template.Library()
+
+FULL_STAR_CLASS = "typcn-star-full-outline"
+HALF_STAR_CLASS = "typcn-star-half-outline"
+EMPTY_STAR_CLASS = "typcn-star-outline"
+
+
+class StarRatingNode(template.Node):
+
+    def __init__(self, rating_percent, max_stars="5"):
+        self.rating = rating_percent
+        self.max_stars = max_stars
+
+    def render(self, context):
+        try:
+            rating = template.Variable(self.rating).resolve(context)
+        except template.VariableDoesNotExist:
+            rating = 0
+
+        try:
+            max_stars = template.Variable(self.max_stars).resolve(context)
+        except template.VariableDoesNotExist:
+            max_stars = 0
+
+        total_halves = (max_stars - 1) * rating * 2
+
+        html = [
+            f'<div class="star-rating" title="{ 1 + (total_halves / 2):.2f} stars">'
+            f'<span class="typcn {FULL_STAR_CLASS}"></span>'
+        ]
+
+        for i in range(max_stars - 1):
+            if total_halves >= 2 * i + 2:
+                cls = FULL_STAR_CLASS
+            elif total_halves >= 2 * i + 1:
+                cls = HALF_STAR_CLASS
+            else:
+                cls = EMPTY_STAR_CLASS
+
+            html.append(f'<span class="typcn {cls}"></span>')
+
+        html.append("</div>")
+
+        return u"".join(html)
+
+
+@register.tag(name='starrating')
+def star_rating_tag(parser, token):
+    """
+    {% rating percent [max_stars=5]%}
+    """
+    parts = token.split_contents()
+    if len(parts) <= 1:
+        raise template.TemplateSyntaxError("'set' tag must be of the form: {% rating <value_percent> [<max_stars>=5] %}")
+
+    if len(parts) <= 2:
+        return StarRatingNode(parts[1])
+
+    return StarRatingNode(parts[1], parts[2])
+
--- a/app/YtManagerApp/tests.py
+++ b/app/YtManagerApp/tests.py
@@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.
--- a/app/YtManagerApp/urls.py
+++ b/app/YtManagerApp/urls.py
@@ -0,0 +1,60 @@
+"""YtManager URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/1.11/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.conf.urls import url, include
+    2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
+"""
+from django.conf import settings
+from django.conf.urls import include
+from django.conf.urls.static import static
+from django.urls import path
+
+from .views.actions import SyncNowView, DeleteVideoFilesView, DownloadVideoFilesView, MarkVideoWatchedView, \
+    MarkVideoUnwatchedView
+from .views.auth import ExtendedLoginView, RegisterView, RegisterDoneView
+from .views.index import index, ajax_get_tree, ajax_get_videos, CreateFolderModal, UpdateFolderModal, DeleteFolderModal, \
+    CreateSubscriptionModal, UpdateSubscriptionModal, DeleteSubscriptionModal
+from .views.settings import SettingsView
+
+urlpatterns = [
+    # Authentication URLs
+    path('login/', ExtendedLoginView.as_view(), name='login'),
+    path('register/', RegisterView.as_view(), name='register'),
+    path('register_done/', RegisterDoneView.as_view(), name='register_done'),
+    path('', include('django.contrib.auth.urls')),
+
+    # Ajax
+    path('ajax/action/sync_now/', SyncNowView.as_view(), name='ajax_action_sync_now'),
+    path('ajax/action/delete_video_files/<int:pk>', DeleteVideoFilesView.as_view(), name='ajax_action_delete_video_files'),
+    path('ajax/action/download_video_files/<int:pk>', DownloadVideoFilesView.as_view(), name='ajax_action_download_video_files'),
+    path('ajax/action/mark_video_watched/<int:pk>', MarkVideoWatchedView.as_view(), name='ajax_action_mark_video_watched'),
+    path('ajax/action/mark_video_unwatched/<int:pk>', MarkVideoUnwatchedView.as_view(), name='ajax_action_mark_video_unwatched'),
+
+    path('ajax/get_tree/', ajax_get_tree, name='ajax_get_tree'),
+    path('ajax/get_videos/', ajax_get_videos, name='ajax_get_videos'),
+
+    # Modals
+    path('modal/create_folder/', CreateFolderModal.as_view(), name='modal_create_folder'),
+    path('modal/create_folder/<int:parent_id>/', CreateFolderModal.as_view(), name='modal_create_folder'),
+    path('modal/update_folder/<int:pk>/', UpdateFolderModal.as_view(), name='modal_update_folder'),
+    path('modal/delete_folder/<int:pk>/', DeleteFolderModal.as_view(), name='modal_delete_folder'),
+
+    path('modal/create_subscription/', CreateSubscriptionModal.as_view(), name='modal_create_subscription'),
+    path('modal/create_subscription/<int:parent_folder_id>/', CreateSubscriptionModal.as_view(), name='modal_create_subscription'),
+    path('modal/update_subscription/<int:pk>/', UpdateSubscriptionModal.as_view(), name='modal_update_subscription'),
+    path('modal/delete_subscription/<int:pk>/', DeleteSubscriptionModal.as_view(), name='modal_delete_subscription'),
+
+    # Pages
+    path('', index, name='home'),
+    path('settings/', SettingsView.as_view(), name='settings'),
+
+] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
--- a/app/YtManagerApp/utils/init.py
+++ b/app/YtManagerApp/utils/init.py
--- a/app/YtManagerApp/utils/extended_interpolation_with_env.py
+++ b/app/YtManagerApp/utils/extended_interpolation_with_env.py
@@ -0,0 +1,92 @@
+import os
+import os.path
+import re
+from configparser import Interpolation, NoSectionError, NoOptionError, InterpolationMissingOptionError, \
+    InterpolationDepthError, InterpolationSyntaxError
+
+MAX_INTERPOLATION_DEPTH = 10
+
+
+class ExtendedInterpolatorWithEnv(Interpolation):
+    """Advanced variant of interpolation, supports the syntax used by
+    `zc.buildout'. Enables interpolation between sections.
+
+    This modified version also allows specifying environment variables
+    using ${env:...}, and allows adding additional options using 'set_additional_options'. """
+
+    _KEYCRE = re.compile(r"\$\{([^}]+)\}")
+
+    def before_get(self, parser, section, option, value, defaults):
+        L = []
+        self._interpolate_some(parser, option, L, value, section, defaults, 1)
+        return ''.join(L)
+
+    def before_set(self, parser, section, option, value):
+        tmp_value = value.replace('$$', '')  # escaped dollar signs
+        tmp_value = self._KEYCRE.sub('', tmp_value)  # valid syntax
+        if '$' in tmp_value:
+            raise ValueError("invalid interpolation syntax in %r at "
+                             "position %d" % (value, tmp_value.find('$')))
+        return value
+
+    def _resolve_option(self, option, defaults):
+        return defaults[option]
+
+    def _resolve_section_option(self, section, option, parser):
+        if section == 'env':
+            return os.getenv(option, '')
+        return parser.get(section, option, raw=True)
+
+    def _interpolate_some(self, parser, option, accum, rest, section, map,
+                          depth):
+        rawval = parser.get(section, option, raw=True, fallback=rest)
+        if depth > MAX_INTERPOLATION_DEPTH:
+            raise InterpolationDepthError(option, section, rawval)
+        while rest:
+            p = rest.find("$")
+            if p < 0:
+                accum.append(rest)
+                return
+            if p > 0:
+                accum.append(rest[:p])
+                rest = rest[p:]
+            # p is no longer used
+            c = rest[1:2]
+            if c == "$":
+                accum.append("$")
+                rest = rest[2:]
+            elif c == "{":
+                m = self._KEYCRE.match(rest)
+                if m is None:
+                    raise InterpolationSyntaxError(option, section,
+                                                   "bad interpolation variable reference %r" % rest)
+                path = m.group(1).split(':')
+                rest = rest[m.end():]
+                sect = section
+                opt = option
+                try:
+                    if len(path) == 1:
+                        opt = parser.optionxform(path[0])
+                        v = self._resolve_option(opt, map)
+                    elif len(path) == 2:
+                        sect = path[0]
+                        opt = parser.optionxform(path[1])
+                        v = self._resolve_section_option(sect, opt, parser)
+                    else:
+                        raise InterpolationSyntaxError(
+                            option, section,
+                            "More than one ':' found: %r" % (rest,))
+                except (KeyError, NoSectionError, NoOptionError):
+                    raise InterpolationMissingOptionError(
+                        option, section, rawval, ":".join(path)) from None
+                if "$" in v:
+                    self._interpolate_some(parser, opt, accum, v, sect,
+                                           dict(parser.items(sect, raw=True)),
+                                           depth + 1)
+                else:
+                    accum.append(v)
+            else:
+                raise InterpolationSyntaxError(
+                    option, section,
+                    "'$' must be followed by '$' or '{', "
+                    "found: %r" % (rest,))
--- a/app/YtManagerApp/utils/youtube.py
+++ b/app/YtManagerApp/utils/youtube.py
@@ -0,0 +1,48 @@
+from django.conf import settings
+from external.pytaw.pytaw.youtube import YouTube, Channel, Playlist, PlaylistItem, Thumbnail, InvalidURL, Resource, Video
+from typing import Optional
+
+
+class YoutubeAPI(YouTube):
+
+    @staticmethod
+    def build_public() -> 'YoutubeAPI':
+        return YoutubeAPI(key=settings.YOUTUBE_API_KEY)
+
+    # @staticmethod
+    # def build_oauth() -> 'YoutubeAPI':
+    #     flow =
+    #     credentials =
+    #     service = build(API_SERVICE_NAME, API_VERSION, credentials)
+
+
+def default_thumbnail(resource: Resource) -> Optional[Thumbnail]:
+    """
+    Gets the default thumbnail for a resource.
+    Searches in the list of thumbnails for one with the label 'default', or takes the first one.
+    :param resource:
+    :return:
+    """
+    thumbs = getattr(resource, 'thumbnails', None)
+
+    if thumbs is None or len(thumbs) <= 0:
+        return None
+
+    return next(
+        (i for i in thumbs if i.id == 'default'),
+        thumbs[0]
+    )
+
+
+def best_thumbnail(resource: Resource) -> Optional[Thumbnail]:
+    """
+    Gets the best thumbnail available for a resource.
+    :param resource:
+    :return:
+    """
+    thumbs = getattr(resource, 'thumbnails', None)
+
+    if thumbs is None or len(thumbs) <= 0:
+        return None
+
+    return max(thumbs, key=lambda t: t.width * t.height)
--- a/app/YtManagerApp/views/init.py
+++ b/app/YtManagerApp/views/init.py
--- a/app/YtManagerApp/views/actions.py
+++ b/app/YtManagerApp/views/actions.py
@@ -0,0 +1,51 @@
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.http import JsonResponse
+from django.views.generic import View
+
+from YtManagerApp.management.jobs.synchronize import schedule_synchronize_now
+from YtManagerApp.models import Video
+
+
+class SyncNowView(LoginRequiredMixin, View):
+    def post(self, *args, **kwargs):
+        schedule_synchronize_now()
+        return JsonResponse({
+            'success': True
+        })
+
+
+class DeleteVideoFilesView(LoginRequiredMixin, View):
+    def post(self, *args, **kwargs):
+        video = Video.objects.get(id=kwargs['pk'])
+        video.delete_files()
+        return JsonResponse({
+            'success': True
+        })
+
+
+class DownloadVideoFilesView(LoginRequiredMixin, View):
+    def post(self, *args, **kwargs):
+        video = Video.objects.get(id=kwargs['pk'])
+        video.download()
+        return JsonResponse({
+            'success': True
+        })
+
+
+class MarkVideoWatchedView(LoginRequiredMixin, View):
+    def post(self, *args, **kwargs):
+        video = Video.objects.get(id=kwargs['pk'])
+        video.mark_watched()
+        return JsonResponse({
+            'success': True
+        })
+
+
+class MarkVideoUnwatchedView(LoginRequiredMixin, View):
+    def post(self, *args, **kwargs):
+        video = Video.objects.get(id=kwargs['pk'])
+        video.mark_unwatched()
+        video.save()
+        return JsonResponse({
+            'success': True
+        })
--- a/app/YtManagerApp/views/auth.py
+++ b/app/YtManagerApp/views/auth.py
@@ -0,0 +1,83 @@
+from crispy_forms.helper import FormHelper
+from crispy_forms.layout import Submit
+from django import forms
+from django.contrib.auth import login, authenticate
+from django.contrib.auth.forms import AuthenticationForm, UserCreationForm
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.contrib.auth.models import User
+from django.contrib.auth.views import LoginView
+from django.urls import reverse_lazy
+from django.views.generic import FormView, TemplateView
+
+
+class ExtendedAuthenticationForm(AuthenticationForm):
+    remember_me = forms.BooleanField(label='Remember me', required=False, initial=False)
+
+    def clean(self):
+        remember_me = self.cleaned_data.get('remember_me')
+        if remember_me:
+            expiry = 3600 * 24 * 30
+        else:
+            expiry = 0
+        self.request.session.set_expiry(expiry)
+
+        return super().clean()
+
+
+class ExtendedLoginView(LoginView):
+    form_class = ExtendedAuthenticationForm
+
+
+class ExtendedUserCreationForm(UserCreationForm):
+    email = forms.EmailField(required=False,
+                             label='E-mail address',
+                             help_text='The e-mail address is optional, but it is the only way to recover a lost '
+                                       'password.')
+    first_name = forms.CharField(max_length=30, required=False,
+                                 label='First name')
+    last_name = forms.CharField(max_length=150, required=False,
+                                label='Last name')
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.helper = FormHelper()
+        self.helper.label_class = 'col-3'
+        self.helper.field_class = 'col-9'
+        self.helper.form_class = 'form-horizontal'
+        self.helper.form_method = 'post'
+        self.helper.form_action = reverse_lazy('register')
+        self.helper.add_input(Submit('submit', 'register'))
+
+    class Meta(UserCreationForm.Meta):
+        fields = ['username', 'email', 'first_name', 'last_name']
+
+
+class RegisterView(FormView):
+    template_name = 'registration/register.html'
+    form_class = ExtendedUserCreationForm
+    success_url = reverse_lazy('register_done')
+
+    def form_valid(self, form):
+        is_first_user = (User.objects.count() == 0)
+
+        user = form.save()
+        if is_first_user:
+            user.is_staff = True
+            user.is_superuser = True
+            user.save()
+
+        username = form.cleaned_data.get('username')
+        password = form.cleaned_data.get('password1')
+        user = authenticate(username=username, password=password)
+        login(self.request, user)
+
+        return super().form_valid(form)
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context['is_first_user'] = (User.objects.count() == 0)
+        return context
+
+
+class RegisterDoneView(LoginRequiredMixin, TemplateView):
+    template_name = 'registration/register_done.html'
--- a/app/YtManagerApp/views/controls/init.py
+++ b/app/YtManagerApp/views/controls/init.py
--- a/app/YtManagerApp/views/controls/modal.py
+++ b/app/YtManagerApp/views/controls/modal.py
@@ -0,0 +1,53 @@
+from django.views.generic.base import ContextMixin
+from django.http import JsonResponse
+
+
+class ModalMixin(ContextMixin):
+    template_name = 'YtManagerApp/controls/modal.html'
+    success_url = '/'
+
+    def __init__(self, modal_id='dialog', title='', fade=True, centered=True, small=False, large=False, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.id = modal_id
+        self.title = title
+        self.fade = fade
+        self.centered = centered
+        self.small = small
+        self.large = large
+
+    def get_context_data(self, **kwargs):
+        data = super().get_context_data(**kwargs)
+        data['modal_id'] = self.id
+
+        data['modal_classes'] = ''
+        if self.fade:
+            data['modal_classes'] += 'fade '
+
+        data['modal_dialog_classes'] = ''
+        if self.centered:
+            data['modal_dialog_classes'] += 'modal-dialog-centered '
+        if self.small:
+            data['modal_dialog_classes'] += 'modal-sm '
+        elif self.large:
+            data['modal_dialog_classes'] += 'modal-lg '
+
+        data['modal_title'] = self.title
+
+        return data
+
+    def modal_response(self, form, success=True, error_msg=None):
+        result = {'success': success}
+        if not success:
+            result['errors'] = form.errors.get_json_data(escape_html=True)
+        if error_msg is not None:
+            result['errors']['__all__'] = [{'message': error_msg}]
+
+        return JsonResponse(result)
+
+    def form_valid(self, form):
+        super().form_valid(form)
+        return self.modal_response(form, success=True)
+
+    def form_invalid(self, form):
+        super().form_invalid(form)
+        return self.modal_response(form, success=False)
--- a/app/YtManagerApp/views/index.py
+++ b/app/YtManagerApp/views/index.py
@@ -0,0 +1,348 @@
+from crispy_forms.helper import FormHelper
+from crispy_forms.layout import Layout, Field, HTML
+from django import forms
+from django.contrib.auth.decorators import login_required
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.db.models import Q
+from django.http import HttpRequest, HttpResponseBadRequest, JsonResponse
+from django.shortcuts import render
+from django.views.generic import CreateView, UpdateView, DeleteView
+from django.views.generic.edit import FormMixin
+
+from YtManagerApp.management.videos import get_videos
+from YtManagerApp.models import Subscription, SubscriptionFolder, VIDEO_ORDER_CHOICES, VIDEO_ORDER_MAPPING
+from YtManagerApp.utils import youtube
+from YtManagerApp.views.controls.modal import ModalMixin
+
+
+class VideoFilterForm(forms.Form):
+    CHOICES_SHOW_WATCHED = (
+        ('y', 'Watched'),
+        ('n', 'Not watched'),
+        ('all', '(All)')
+    )
+
+    CHOICES_SHOW_DOWNLOADED = (
+        ('y', 'Downloaded'),
+        ('n', 'Not downloaded'),
+        ('all', '(All)')
+    )
+
+    MAPPING_SHOW = {
+        'y': True,
+        'n': False,
+        'all': None
+    }
+
+    query = forms.CharField(label='', required=False)
+    sort = forms.ChoiceField(label='Sort:', choices=VIDEO_ORDER_CHOICES, initial='newest')
+    show_watched = forms.ChoiceField(label='Show only: ', choices=CHOICES_SHOW_WATCHED, initial='all')
+    show_downloaded = forms.ChoiceField(label='', choices=CHOICES_SHOW_DOWNLOADED, initial='all')
+    subscription_id = forms.IntegerField(
+        required=False,
+        widget=forms.HiddenInput()
+    )
+    folder_id = forms.IntegerField(
+        required=False,
+        widget=forms.HiddenInput()
+    )
+
+    def __init__(self, data=None):
+        super().__init__(data, auto_id='form_video_filter_%s')
+        self.helper = FormHelper()
+        self.helper.form_id = 'form_video_filter'
+        self.helper.form_class = 'form-inline'
+        self.helper.form_method = 'POST'
+        self.helper.form_action = 'ajax_get_videos'
+        self.helper.field_class = 'mr-1'
+        self.helper.label_class = 'ml-2 mr-1 no-asterisk'
+
+        self.helper.layout = Layout(
+            Field('query', placeholder='Search'),
+            'sort',
+            'show_watched',
+            'show_downloaded',
+            'subscription_id',
+            'folder_id'
+        )
+
+    def clean_sort(self):
+        data = self.cleaned_data['sort']
+        return VIDEO_ORDER_MAPPING[data]
+
+    def clean_show_downloaded(self):
+        data = self.cleaned_data['show_downloaded']
+        return VideoFilterForm.MAPPING_SHOW[data]
+
+    def clean_show_watched(self):
+        data = self.cleaned_data['show_watched']
+        return VideoFilterForm.MAPPING_SHOW[data]
+
+
+def __tree_folder_id(fd_id):
+    if fd_id is None:
+        return '#'
+    return 'folder' + str(fd_id)
+
+
+def __tree_sub_id(sub_id):
+    if sub_id is None:
+        return '#'
+    return 'sub' + str(sub_id)
+
+
+def index(request: HttpRequest):
+    if request.user.is_authenticated:
+        context = {
+            'filter_form': VideoFilterForm()
+        }
+        return render(request, 'YtManagerApp/index.html', context)
+    else:
+        return render(request, 'YtManagerApp/index_unauthenticated.html')
+
+
+@login_required
+def ajax_get_tree(request: HttpRequest):
+
+    def visit(node):
+        if isinstance(node, SubscriptionFolder):
+            return {
+                "id": __tree_folder_id(node.id),
+                "text": node.name,
+                "type": "folder",
+                "state": {"opened": True},
+                "parent": __tree_folder_id(node.parent_id)
+            }
+        elif isinstance(node, Subscription):
+            return {
+                "id": __tree_sub_id(node.id),
+                "type": "sub",
+                "text": node.name,
+                "icon": node.icon_default,
+                "parent": __tree_folder_id(node.parent_folder_id)
+            }
+
+    result = SubscriptionFolder.traverse(None, request.user, visit)
+    return JsonResponse(result, safe=False)
+
+
+@login_required
+def ajax_get_videos(request: HttpRequest):
+    if request.method == 'POST':
+        form = VideoFilterForm(request.POST)
+        if form.is_valid():
+            videos = get_videos(
+                user=request.user,
+                sort_order=form.cleaned_data['sort'],
+                query=form.cleaned_data['query'],
+                subscription_id=form.cleaned_data['subscription_id'],
+                folder_id=form.cleaned_data['folder_id'],
+                only_watched=form.cleaned_data['show_watched'],
+                only_downloaded=form.cleaned_data['show_downloaded']
+            )
+
+            context = {
+                'videos': videos
+            }
+
+            return render(request, 'YtManagerApp/index_videos.html', context)
+
+    return HttpResponseBadRequest()
+
+
+class SubscriptionFolderForm(forms.ModelForm):
+    class Meta:
+        model = SubscriptionFolder
+        fields = ['name', 'parent']
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.helper = FormHelper()
+        self.helper.form_tag = False
+
+    def clean_name(self):
+        name = self.cleaned_data['name']
+        return name.strip()
+
+    def clean(self):
+        cleaned_data = super().clean()
+        name = cleaned_data.get('name')
+        parent = cleaned_data.get('parent')
+
+        # Check name is unique in parent folder
+        args_id = []
+        if self.instance is not None:
+            args_id.append(~Q(id=self.instance.id))
+
+        if SubscriptionFolder.objects.filter(parent=parent, name__iexact=name, *args_id).count() > 0:
+            raise forms.ValidationError(
+                'A folder with the same name already exists in the given parent directory!', code='already_exists')
+
+        # Check for cycles
+        if self.instance is not None:
+            self.__test_cycles(parent)
+
+    def __test_cycles(self, new_parent):
+        visited = [self.instance.id]
+        current = new_parent
+        while current is not None:
+            if current.id in visited:
+                raise forms.ValidationError('Selected parent would create a parenting cycle!', code='parenting_cycle')
+            visited.append(current.id)
+            current = current.parent
+
+
+class CreateFolderModal(LoginRequiredMixin, ModalMixin, CreateView):
+    template_name = 'YtManagerApp/controls/folder_create_modal.html'
+    form_class = SubscriptionFolderForm
+
+    def form_valid(self, form):
+        form.instance.user = self.request.user
+        return super().form_valid(form)
+
+
+class UpdateFolderModal(LoginRequiredMixin, ModalMixin, UpdateView):
+    template_name = 'YtManagerApp/controls/folder_update_modal.html'
+    model = SubscriptionFolder
+    form_class = SubscriptionFolderForm
+
+
+class DeleteFolderForm(forms.Form):
+    keep_subscriptions = forms.BooleanField(required=False, initial=False, label="Keep subscriptions")
+
+
+class DeleteFolderModal(LoginRequiredMixin, ModalMixin, FormMixin, DeleteView):
+    template_name = 'YtManagerApp/controls/folder_delete_modal.html'
+    model = SubscriptionFolder
+    form_class = DeleteFolderForm
+
+    def delete(self, request, *args, **kwargs):
+        self.object = self.get_object()
+        form = self.get_form()
+        if form.is_valid():
+            return self.form_valid(form)
+        else:
+            return self.form_invalid(form)
+
+    def form_valid(self, form):
+        self.object.delete_folder(keep_subscriptions=form.cleaned_data['keep_subscriptions'])
+        return super().form_valid(form)
+
+
+class CreateSubscriptionForm(forms.ModelForm):
+    playlist_url = forms.URLField(label='Playlist/Channel URL')
+
+    class Meta:
+        model = Subscription
+        fields = ['parent_folder', 'auto_download',
+                  'download_limit', 'download_order', 'delete_after_watched']
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.yt_api = youtube.YoutubeAPI.build_public()
+        self.helper = FormHelper()
+        self.helper.form_tag = False
+        self.helper.layout = Layout(
+            'playlist_url',
+            'parent_folder',
+            HTML('<hr>'),
+            HTML('<h5>Download configuration overloads</h5>'),
+            'auto_download',
+            'download_limit',
+            'download_order',
+            'delete_after_watched'
+        )
+
+    def clean_playlist_url(self):
+        playlist_url: str = self.cleaned_data['playlist_url']
+        try:
+            parsed_url = self.yt_api.parse_url(playlist_url)
+        except youtube.InvalidURL as e:
+            raise forms.ValidationError(str(e))
+
+        is_playlist = 'playlist' in parsed_url
+        is_channel = parsed_url['type'] in ('channel', 'user', 'channel_custom')
+
+        if not is_channel and not is_playlist:
+            raise forms.ValidationError('The given URL must link to a channel or a playlist!')
+
+        return playlist_url
+
+
+class CreateSubscriptionModal(LoginRequiredMixin, ModalMixin, CreateView):
+    template_name = 'YtManagerApp/controls/subscription_create_modal.html'
+    form_class = CreateSubscriptionForm
+
+    def form_valid(self, form):
+        form.instance.user = self.request.user
+        api = youtube.YoutubeAPI.build_public()
+        try:
+            form.instance.fetch_from_url(form.cleaned_data['playlist_url'], api)
+        except youtube.InvalidURL as e:
+            return self.modal_response(form, False, str(e))
+        except ValueError as e:
+            return self.modal_response(form, False, str(e))
+        # except youtube.YoutubeUserNotFoundException:
+        #     return self.modal_response(
+        #         form, False, 'Could not find an user based on the given URL. Please verify that the URL is correct.')
+        # except youtube.YoutubePlaylistNotFoundException:
+        #     return self.modal_response(
+        #         form, False, 'Could not find a playlist based on the given URL. Please verify that the URL is correct.')
+        # except youtube.YoutubeException as e:
+        #     return self.modal_response(
+        #         form, False, str(e))
+        # except youtube.APIError as e:
+        #     return self.modal_response(
+        #         form, False, 'An error occurred while communicating with the YouTube API: ' + str(e))
+
+        return super().form_valid(form)
+
+
+class UpdateSubscriptionForm(forms.ModelForm):
+    class Meta:
+        model = Subscription
+        fields = ['name', 'parent_folder', 'auto_download',
+                  'download_limit', 'download_order', 'delete_after_watched']
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.helper = FormHelper()
+        self.helper.form_tag = False
+        self.helper.layout = Layout(
+            'name',
+            'parent_folder',
+            HTML('<hr>'),
+            HTML('<h5>Download configuration overloads</h5>'),
+            'auto_download',
+            'download_limit',
+            'download_order',
+            'delete_after_watched'
+        )
+
+
+class UpdateSubscriptionModal(LoginRequiredMixin, ModalMixin, UpdateView):
+    template_name = 'YtManagerApp/controls/subscription_update_modal.html'
+    model = Subscription
+    form_class = UpdateSubscriptionForm
+
+
+class DeleteSubscriptionForm(forms.Form):
+    keep_downloaded_videos = forms.BooleanField(required=False, initial=False, label="Keep downloaded videos")
+
+
+class DeleteSubscriptionModal(LoginRequiredMixin, ModalMixin, FormMixin, DeleteView):
+    template_name = 'YtManagerApp/controls/subscription_delete_modal.html'
+    model = Subscription
+    form_class = DeleteSubscriptionForm
+
+    def delete(self, request, *args, **kwargs):
+        self.object = self.get_object()
+        form = self.get_form()
+        if form.is_valid():
+            return self.form_valid(form)
+        else:
+            return self.form_invalid(form)
+
+    def form_valid(self, form):
+        self.object.delete_subscription(keep_downloaded_videos=form.cleaned_data['keep_downloaded_videos'])
+        return super().form_valid(form)
--- a/app/YtManagerApp/views/settings.py
+++ b/app/YtManagerApp/views/settings.py
@@ -0,0 +1,51 @@
+from crispy_forms.helper import FormHelper
+from crispy_forms.layout import Layout, HTML, Submit
+from django import forms
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.urls import reverse_lazy
+from django.views.generic import UpdateView
+
+from YtManagerApp.models import UserSettings
+
+
+class SettingsForm(forms.ModelForm):
+    class Meta:
+        model = UserSettings
+        exclude = ['user']
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.helper = FormHelper()
+        self.helper.form_class = 'form-horizontal'
+        self.helper.label_class = 'col-lg-3'
+        self.helper.field_class = 'col-lg-9'
+        self.helper.layout = Layout(
+            'mark_deleted_as_watched',
+            'delete_watched',
+            HTML('<h2>Download settings</h2>'),
+            'auto_download',
+            'download_path',
+            'download_file_pattern',
+            'download_format',
+            'download_order',
+            'download_global_limit',
+            'download_subscription_limit',
+            HTML('<h2>Subtitles download settings</h2>'),
+            'download_subtitles',
+            'download_subtitles_langs',
+            'download_subtitles_all',
+            'download_autogenerated_subtitles',
+            'download_subtitles_format',
+            Submit('submit', value='Save')
+        )
+
+
+class SettingsView(LoginRequiredMixin, UpdateView):
+    form_class = SettingsForm
+    model = UserSettings
+    template_name = 'YtManagerApp/settings.html'
+    success_url = reverse_lazy('home')
+
+    def get_object(self, queryset=None):
+        obj, _ = self.model.objects.get_or_create(user=self.request.user)
+        return obj
				`@@ -0,0 +1 @@`
				`<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M10 4H4c-1.1 0-1.99.9-1.99 2L2 18c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V8c0-1.1-.9-2-2-2h-8l-2-2z"/><path d="M0 0h24v24H0z" fill="none"/></svg>`