share/lua/website/guardian.lua

   1
   2 -- libquvi-scripts
   3 -- Copyright (C) 2011  Toni Gundogdu <legatvs@gmail.com>
   4 --
   5 -- This file is part of libquvi-scripts <http://quvi.sourceforge.net/>.
   6 --
   7 -- This library is free software; you can redistribute it and/or
   8 -- modify it under the terms of the GNU Lesser General Public
   9 -- License as published by the Free Software Foundation; either
  10 -- version 2.1 of the License, or (at your option) any later version.
  11 --
  12 -- This library 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 GNU
  15 -- Lesser General Public License for more details.
  16 --
  17 -- You should have received a copy of the GNU Lesser General Public
  18 -- License along with this library; if not, write to the Free Software
  19 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20 -- 02110-1301  USA
  21 --
  22
  23 --
  24 -- NOTE: Ignores the m3u8 format. Patches welcome.
  25 --
  26 --   libquvi allows specifying multiple media stream URLs in
  27 --   "self.url" (referred sometimes as "media or video segments"),
  28 --   e.g.
  29 --      self.url = {"http://foo", "http://bar"}
  30 --
  31 --   Whether the applications using libquvi make any use of this,
  32 --   is a whole different matter.
  33 --
  34
  35 local Guardian = {} -- Utility functions unique to this script
  36
  37 -- Identify the script.
  38 function ident (self)
  39     package.path = self.script_dir .. '/?.lua'
  40     local C      = require 'quvi/const'
  41     local r      = {}
  42     r.domain     = "guardian%.co%.uk"
  43     r.formats    = "default"
  44     r.categories = C.proto_http
  45     local U      = require 'quvi/util'
  46     r.handles    = U.handles(self.page_url,
  47                     {r.domain}, {"/video/","/audio"})
  48     return r
  49 end
  50
  51 -- Query available formats.
  52 function query_formats(self)
  53     local c = Guardian.get_config(self)
  54     local fmts = Guardian.iter_formats(c)
  55
  56     local t = {}
  57     for _,v in pairs(fmts) do
  58         table.insert(t, Guardian.to_s(v))
  59     end
  60
  61     table.sort(t)
  62     self.formats = table.concat(t, "|")
  63
  64     return self
  65 end
  66
  67 -- Parse media URL.
  68 function parse(self)
  69     self.host_id = "guardian"
  70
  71     local c = Guardian.get_config(self)
  72
  73     local formats = Guardian.iter_formats(c)
  74     local U = require 'quvi/util'
  75     local format  = U.choose_format(self, formats,
  76                                     Guardian.choose_best,
  77                                     Guardian.choose_default,
  78                                     Guardian.to_s)
  79                         or error("unable to choose format")
  80     self.url = {format.url or error("no match: media url")}
  81
  82     self.title = c:match('"headline":%s+"(.-)%s+-%s+video"')
  83                     or error("no match: media title")
  84
  85     self.id = c:match('"video%-id":%s+"(.-)"')
  86                     or error ("no match: media id")
  87
  88     self.thumbnail_url = c:match('"thumbnail%-image%-url":%s+"(.-)"') or ''
  89
  90     local d = c:match('"duration":%s+(%d+)') or 0
  91     self.duration = tonumber(d)*1000 -- to msec
  92
  93     return self
  94 end
  95
  96 --
  97 -- Utility functions
  98 --
  99
 100 function Guardian.get_config(self)
 101     return quvi.fetch(self.page_url .. "/json", {fetch_type='config'})
 102 end
 103
 104 function Guardian.iter_formats(config)
 105     local p = '"format":%s+"(.-)".-"video%-file%-url":%s+"(.-)"'
 106     local t = {}
 107     for c,u in config:gmatch(p) do
 108 --        print(f,u)
 109         c = c:gsub("video/", "")
 110         c = c:gsub(":", "_")
 111         if c ~= "m3u8" then -- http://en.wikipedia.org/wiki/M3U
 112             table.insert(t, {container=c, url=u})
 113         end
 114     end
 115     return t
 116 end
 117
 118 function Guardian.choose_best(t) -- Expect the first to be the 'best'
 119     return t[1]
 120 end
 121
 122 function Guardian.choose_default(t) -- Use the first
 123   return t[1]
 124 end
 125
 126 function Guardian.to_s(t)
 127     return t.container
 128 end
 129
 130 -- vim: set ts=4 sw=4 tw=72 expandtab: