share/playlist/youtube.lua

   1 -- libquvi-scripts
   2 -- Copyright (C) 2012-2013  Toni Gundogdu <legatvs@gmail.com>
   3 --
   4 -- This file is part of libquvi-scripts <http://quvi.sourceforge.net/>.
   5 --
   6 -- This program is free software: you can redistribute it and/or
   7 -- modify it under the terms of the GNU Affero General Public
   8 -- License as published by the Free Software Foundation, either
   9 -- version 3 of the License, or (at your option) any later version.
  10 --
  11 -- This program is distributed in the hope that it will be useful,
  12 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 -- GNU Affero General Public License for more details.
  15 --
  16 -- You should have received a copy of the GNU Affero General
  17 -- Public License along with this program.  If not, see
  18 -- <http://www.gnu.org/licenses/>.
  19 --
  20
  21 local YouTube = {} -- Utility functions unique to this script
  22
  23 -- Identify the playlist script.
  24 function ident(qargs)
  25   return {
  26     domains = table.concat({'youtube.com'}, ','),
  27     can_parse_url = YouTube.can_parse_url(qargs)
  28   }
  29 end
  30
  31 -- Parse playlist properties.
  32 function parse(qargs)
  33
  34   qargs.id = qargs.input_url:match('list=([%w_-]+)')
  35   if #qargs.id <16 then
  36     error('no match: playlist ID')
  37   end
  38
  39   local Y = require 'quvi/youtube'
  40   local P = require 'lxp.lom'
  41
  42   local max_results = 25
  43   local start_index = 1
  44
  45   qargs.media = {}
  46
  47   local C = require 'quvi/const'
  48   local o = { [C.qfo_type] = C.qft_playlist }
  49
  50   local r = {}
  51
  52   -- TODO: Return playlist thumbnail URL
  53   -- TODO: Return playlist title
  54
  55   repeat -- Get the entire playlist.
  56     local u = YouTube.config_url(qargs, start_index, max_results)
  57     local c = quvi.fetch(u, o).data
  58     local x = P.parse(c)
  59
  60     YouTube.chk_error_resp(x)
  61     r = YouTube.parse_media_urls(x)
  62
  63     for _,u in pairs(r) do
  64       local t = {
  65         url = u
  66       }
  67       table.insert(qargs.media, t)
  68     end
  69
  70     start_index = start_index + #r
  71   until #r == 0
  72
  73   return qargs
  74 end
  75
  76 --
  77 -- Utility functions
  78 --
  79
  80 function YouTube.can_parse_url(qargs)
  81   local U = require 'socket.url'
  82   local t = U.parse(qargs.input_url)
  83   if t and t.scheme and t.scheme:lower():match('^https?$')
  84        and t.host   and t.host:lower():match('youtube%.com$')
  85        and t.query  and t.query:lower():match('list=[%w_-]+')
  86   then
  87     return true
  88   else
  89     return false
  90   end
  91 end
  92
  93 function YouTube.config_url(qargs, start_index, max_results)
  94   return string.format( -- Refer to http://is.gd/0msY8X
  95     'http://gdata.youtube.com/feeds/api/playlists/%s?v=2'
  96     .. '&start-index=%s&max-results=%s&strict=true',
  97       qargs.id, start_index, max_results)
  98 end
  99
 100 function YouTube.parse_media_urls(t)
 101   -- TODO: Return media duration_ms
 102   -- TODO: Return media title
 103   local r = {}
 104   if not t then return r end
 105   for i=1, #t do
 106     if t[i].tag == 'entry' then
 107       for j=1, #t[i] do
 108         if t[i][j].tag == 'link' then
 109           if t[i][j].attr['rel'] == 'alternate' then
 110             table.insert(r, t[i][j].attr['href'])
 111           end
 112         end
 113       end
 114     end
 115   end
 116   return r
 117 end
 118
 119 function YouTube.chk_error_resp(t)
 120   if not t then return end
 121   local r = {}
 122   for i=1, #t do
 123     if t[i].tag == 'error' then
 124       for j=1, #t[i] do
 125         if t[i][j].tag == 'domain' then
 126           r.domain = t[i][j][1]
 127         end
 128         if t[i][j].tag == 'code' then
 129           r.code = t[i][j][1]
 130         end
 131         if t[i][j].tag == 'internalReason' then
 132           r.reason = t[i][j][1]
 133         end
 134         if t[i][j].tag == 'location' then -- Ignores 'type' attribute.
 135           r.location = t[i][j][1]
 136         end
 137       end
 138     end
 139   end
 140   if #r >0 then
 141     local m
 142     for k,v in pairs(r) do
 143       m = m .. string.format("%s=%s ", k,v)
 144     end
 145     error(m)
 146   end
 147 end
 148
 149 -- vim: set ts=2 sw=2 tw=72 expandtab: