app/browse/__init__.py

   1 import re
   2 import requests
   3 from flask import Blueprint, render_template, request, flash, g, url_for, redirect
   4 from flask_login import current_user
   5 from werkzeug.exceptions import BadRequest, NotFound
   6
   7 from ..common.common import *
   8 from .lib import *
   9 from .innertube import prepare_searchresults, prepare_channel, prepare_playlist
  10 from .protobuf import make_sp, make_channel_params, make_playlist_params, Filters
  11
  12 frontend = Blueprint('browse', __name__,
  13     template_folder='templates',
  14     static_folder='static',
  15     static_url_path='/static/ys')
  16
  17 @frontend.route('/results')
  18 @frontend.route('/search')
  19 def search():
  20     #token = getattr(current_user, 'token', 'guest')
  21     q = request.args.get('q') or request.args.get('search_query')
  22     continuation = request.args.get('continuation')
  23
  24     sp = make_sp(**{
  25         k:v for k,v in request.args.items()
  26         if k in ['sort','date','type','len']
  27     }, features=[
  28         f for f in request.args.getlist('feature')
  29         if f in Filters.__dataclass_fields__.keys()
  30     ], extras=[
  31         e for e in request.args.getlist('feature')
  32         if e in ['verbatim']
  33     ])
  34
  35     if continuation or q:
  36         yt_results = fetch_ajax("search", **(
  37             {'continuation': continuation} if continuation else {'query': q, 'params': sp}
  38         ))
  39
  40         results, extras, continuation = prepare_searchresults(yt_results)
  41
  42         for extra in extras:
  43             flash(extra, 'info')
  44     else:
  45         results = None
  46
  47     return render_template('search.html.j2', rows=results, query=q, continuation=continuation)
  48
  49 @frontend.route('/channel/<channel_id>/')
  50 @frontend.route('/channel/<channel_id>/<subpage>')
  51 def channel(channel_id, subpage="videos"):
  52     token = getattr(current_user, 'token', 'guest')
  53     if subpage in ("videos", "streams", "shorts"): # "streams"==livestreams
  54         sort_by = request.args.get('sort') or "newest"
  55         query = None
  56     elif subpage == "playlists":
  57         sort_by = request.args.get('sort', "modified")
  58         query = None
  59     elif subpage == "search":
  60         query = request.args.get('q')
  61         sort_by = None
  62     else: # we don't support /home, /about, ..., so redirect to /videos.
  63         return redirect(url_for('.channel', channel_id=channel_id))
  64
  65     # best effort; if it fails, it fails in the redirect.
  66     if not re.match(r"(UC[A-Za-z0-9_-]{22})", channel_id):
  67         return redirect(url_for('.channel_redirect', user=channel_id))
  68
  69     # if we don't have a continuation, we create parameters for page 1 manually:
  70     continuation = request.args.get('continuation') or \
  71         make_channel_params(channel_id, subpage, 1, sort_by, query, v3=(subpage != "search"))
  72     result = fetch_ajax("browse", continuation=continuation)
  73     error = find_and_parse_error(result)
  74
  75     if result is None: # if fetching from innertube failed, fall back to xmlfeed:
  76         flash("unable to fetch results from ajax; displaying fallback results (15 newest)", "error")
  77         return fallback_route(channel_id, subpage)
  78
  79     if error:
  80         return error, 400 # todo: ugly
  81
  82     # new seperated videos/livestreams/shorts don't return metadata
  83     xmlfeed = fetch_xml("channel_id", channel_id)
  84     if xmlfeed:
  85         title, _, _, _, _ = parse_xml(xmlfeed)
  86
  87     _, descr, thumb, rows, continuation = prepare_channel(result, channel_id, title)
  88     if not rows: # overran end of list, or is special channel (e.g. music topic (sidebar 'best of youtube', UC-9-kyTW8ZkZNDHQJ6FgpwQ)
  89         flash("ajax returned nothing; displaying fallback results (15 newest)", "error")
  90         return fallback_route(channel_id, subpage)
  91
  92
  93     # set pin/hide stati of retrieved videos:
  94     video_ids = [card['content']['video_id'] for card in rows]
  95     pinned, hidden = fetch_video_flags(token, video_ids)
  96     rows = sorted([
  97         {'type':v['type'], 'content':{**v['content'], 'pinned': v['content']['video_id'] in pinned}}
  98         for v in rows
  99         if v['content']['video_id'] not in hidden
 100     ], key=lambda v:v['content']['pinned'], reverse=True)
 101
 102     with sqlite3.connect(cf['global']['database']) as conn:
 103         c = conn.cursor()
 104         c.execute("""
 105             SELECT COUNT(*)
 106               FROM subscriptions
 107              WHERE channel_id = ? AND user = ?
 108         """, (channel_id, token))
 109         (is_subscribed,) = c.fetchone()
 110
 111     return render_template('channel.html.j2',
 112         title=title,
 113         subpage=subpage,
 114         sort=sort_by,
 115         rows=rows,
 116         channel_id=channel_id,
 117         channel_img=thumb,
 118         channel_desc=descr,
 119         is_subscribed=is_subscribed,
 120         continuation=continuation)
 121
 122 @frontend.route('/<user>/<subpage>')
 123 @frontend.route('/user/<user>/')
 124 @frontend.route('/user/<user>/<subpage>')
 125 @frontend.route('/c/<user>/')
 126 @frontend.route('/c/<user>/<subpage>')
 127 def channel_redirect(user, subpage=None):
 128     """
 129     The browse_ajax 'API' needs the UCID.
 130     """
 131
 132     # inverse of the test in /channel/:
 133     if re.match(r"(UC[A-Za-z0-9_-]{22})", user):
 134         return redirect(url_for('.channel', channel_id=user))
 135
 136     if subpage not in (None, "home", "videos", "shorts", "streams", "playlists", "community", "channels", "about"):
 137         raise NotFound("not a valid channel subpage")
 138
 139     channel_id = canonicalize_channel(request.path)
 140     if not channel_id:
 141         raise NotFound("channel does not exist")
 142
 143     return redirect(
 144         url_for('.channel', channel_id=channel_id, subpage=subpage), 308
 145     )
 146
 147 @frontend.route('/playlist')
 148 def playlist():
 149     playlist_id = request.args.get('list')
 150     if not playlist_id:
 151         raise BadRequest("No playlist ID")
 152
 153     # if we don't have a continuation, we create parameters for page 1 manually:
 154     continuation = request.args.get('continuation') or \
 155         make_playlist_params(playlist_id, 0)
 156     result = fetch_ajax("browse", continuation=continuation)
 157     error = find_and_parse_error(result)
 158
 159     if result is None:
 160         flash(f"1 {error}. Loading fallback.", 'error')
 161         return fallback_route()
 162
 163     if not 'continuationContents' in result:
 164         flash(f"2 {error}. Loading fallback.", 'error')
 165         return fallback_route()
 166
 167     title, author, channel_id, rows, continuation = prepare_playlist(result)
 168
 169     return render_template('playlist.html.j2',
 170         title=title,
 171         author=author,
 172         channel_id=channel_id,
 173         rows=rows,
 174         continuation=continuation)
 175
 176 @frontend.route('/<something>', strict_slashes=False)
 177 def plain_user_or_video(something):
 178     # this is a near-copy of the same route in app/youtube, but using a
 179     # different, more reliable endpoint to determine whether a channel exists.
 180     if '.' in something:
 181         # prevent a lot of false-positives (and reduce youtube api calls)
 182         raise NotFound
 183
 184     channel_id = canonicalize_channel(something) # /vanity or /@handle
 185     if channel_id:
 186         return redirect(url_for('.channel', channel_id=channel_id))
 187     elif re.match(r"^[-_0-9A-Za-z]{11}$", something): # looks like a video id
 188         return redirect(url_for('youtube.watch', v=something, t=request.args.get('t')))
 189     else: # ¯\_(ツ)_/¯
 190         raise NotFound("Note: some usernames not recognized; try searching it")
 191
 192 @frontend.before_app_request
 193 def inject_button():
 194     if not 'header_items' in g:
 195         g.header_items = []
 196     g.header_items.append({
 197         'name': 'search',
 198         'url': url_for('browse.search'),
 199         'parent': frontend.name,
 200         'priority': 15,
 201     })