share/media/ted.lua

   1 -- libquvi-scripts
   2 -- Copyright (C) 2012,2013  Toni Gundogdu <legatvs@gmail.com>
   3 -- Copyright (C) 2011  Bastien Nocera <hadess@hadess.net>
   4 --
   5 -- This file is part of libquvi-scripts <http://quvi.sourceforge.net/>.
   6 --
   7 -- This program is free software: you can redistribute it and/or
   8 -- modify it under the terms of the GNU Affero General Public
   9 -- License as published by the Free Software Foundation, either
  10 -- version 3 of the License, or (at your option) any later version.
  11 --
  12 -- This program is distributed in the hope that it will be useful,
  13 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 -- GNU Affero General Public License for more details.
  16 --
  17 -- You should have received a copy of the GNU Affero General
  18 -- Public License along with this program.  If not, see
  19 -- <http://www.gnu.org/licenses/>.
  20 --
  21
  22 local Ted = {} -- Utility functions unique to this script
  23
  24 -- Identify the media script.
  25 function ident(qargs)
  26   return {
  27     can_parse_url = Ted.can_parse_url(qargs),
  28     domains = table.concat({'ted.com'}, ',')
  29   }
  30 end
  31
  32 -- Query available formats.
  33 function query_formats(self)
  34     self.formats  = "default"
  35     Ted.is_external(self, quvi.fetch(self.page_url))
  36     return self
  37 end
  38
  39 -- Parse video URL.
  40 function parse(self)
  41     self.host_id = "ted"
  42
  43     local p = quvi.fetch(self.page_url)
  44
  45     if Ted.is_external(self, p) then return self end
  46
  47     self.id = p:match('ti:"(%d+)"') or error("no match: media ID")
  48
  49     self.title = p:match('<title>(.-)%s+|') or error("no match: media title")
  50
  51     self.thumbnail_url = p:match('"og:image" content="(.-)"') or ''
  52
  53     return self
  54 end
  55
  56 --
  57 -- Utility functions
  58 --
  59
  60 function Ted.can_parse_url(qargs)
  61   local U = require 'socket.url'
  62   local t = U.parse(qargs.input_url)
  63   if t and t.scheme and t.scheme:lower():match('^http$')
  64        and t.host   and t.host:lower():match('^www.ted%.com$')
  65        and t.path   and t.path:lower():match('^/talks/.+$')
  66   then
  67     return true
  68   else
  69     return false
  70   end
  71 end
  72
  73 function Ted.is_external(self, p)
  74     self.url = {p:match('(http://download.-)"') or ''}
  75     if #self.url[1] ==0 then  -- Try the first iframe
  76         self.redirect_url = p:match('<iframe src="(.-)"') or ''
  77         if #self.redirect_url >0 then
  78             return true
  79         else
  80           error('no match: media stream URL')
  81         end
  82     end
  83     return false
  84 end
  85
  86 -- vim: set ts=4 sw=4 tw=72 expandtab: