share/lua/website/foxnews.lua

   1
   2 -- libquvi-scripts
   3 -- Copyright (C) 2011  Lionel Elie Mamane <lionel@mamane.lu>
   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 local Foxnews = {} -- Utility functions unique to this script.
  24
  25 -- Identify the script.
  26 function ident(self)
  27     package.path = self.script_dir .. '/?.lua'
  28     local C      = require 'quvi/const'
  29     local r      = {}
  30     r.domain     = "video%.foxnews%.com"
  31     r.formats    = "default|best"
  32     r.categories = C.proto_http
  33     local U      = require 'quvi/util'
  34     r.handles    = U.handles(self.page_url, {r.domain}, {"/v/%d+"})
  35                     or U.handles(self.page_url, {r.domain}, {"/v/embed%.js"},
  36                         {"id%=%d+"})
  37                     or U.handles(self.page_url, {r.domain},
  38                         {"/v/video%-embed%.html"}, {"video_id=%d+"})
  39     return r
  40 end
  41
  42 -- Query available formats.
  43 function query_formats(self)
  44     local U       = require 'quvi/util'
  45     local js      = Foxnews.fetch_feed_js(self, U)
  46     local formats = Foxnews.iter_formats_js(js, U)
  47
  48     local t = {}
  49     for _,v in pairs(formats) do
  50         table.insert(t, Foxnews.to_s(v))
  51     end
  52
  53     table.sort(t)
  54     self.formats = table.concat(t, "|")
  55
  56     return self
  57 end
  58
  59 -- Parse media URL.
  60 function parse(self)
  61     self.host_id = "foxnews"
  62
  63     local U  = require 'quvi/util'
  64     local js = Foxnews.fetch_feed_js(self, U)
  65
  66     local item = js:match('"item":(%b{})')
  67                   or error("no match: item")
  68
  69     self.title = js:match('"title":"(.-)"')
  70                   or error("no match: media title")
  71
  72     do
  73         local thumbs = Foxnews.iter_thumbnails_js(item)
  74         local best_thumb_res = -1
  75         local best_thumb_url = ''
  76         for _,thumb in pairs(thumbs) do
  77             local res = thumb.height*thumb.width
  78             if res > best_thumb_res then
  79                 best_thumb_url = thumb.url
  80                 best_thumb_res = res
  81             end
  82         end
  83         self.thumbnail_url = best_thumb_url
  84     end
  85
  86     local formats = Foxnews.iter_formats_js(item, U)
  87     local format  = U.choose_format(self, formats,
  88                                      Foxnews.choose_best,
  89                                      Foxnews.choose_default,
  90                                      Foxnews.to_s)
  91                         or error("unable to choose format")
  92     self.url      = {format.url or error("no match: media url")}
  93     return self
  94 end
  95
  96 --
  97 -- Utility functions
  98 --
  99
 100 function Foxnews.fetch_feed_js(self, U)
 101     self.page_url = Foxnews.normalize(self)
 102
 103     return quvi.fetch('http://video.foxnews.com/v/feed/video/'
 104             .. self.id .. '.js?template=grab')
 105 end
 106
 107 function Foxnews.normalize(self) -- "Normalize" embedded URLs
 108     if self.page_url:match("/v/embed.js?id=",1,true) then
 109         self.page_url = self.page_url:gsub("/v/embed%.js%?id=(%d+)", "/v/%1/")
 110     elseif self.page_url:match("/v/video-embed.html?video_id=",1,true) then
 111         self.page_url =
 112             self.page_url:gsub("/v/video%-embed%.html%?video_id=(%d+)",
 113                                "/v/%1/")
 114     end
 115     local _, ie, s = self.page_url:find("/v/(%d+)")
 116     self.id = s or error("no match: media id")
 117     self.page_url = self.page_url:sub(1, ie)
 118 end
 119
 120 function Foxnews.iter_formats_js(page, U)
 121     local formats = Foxnews.find_set(page, '"media%-content"')
 122     if not formats then
 123         error("no match: media-content")
 124     end
 125
 126     local t = {}
 127     for attrs in formats:gmatch('"@attributes":(%b{})') do
 128         local format = {}
 129         for key,value in attrs:gmatch('"(.-)":"(.-)"') do
 130             format[key]=value
 131             end
 132         if format.rel == "stream" then
 133             local a = {"framerate","bitrate","height","duration","width"}
 134             for _, key in pairs(a) do
 135                 if format[key] then
 136                     format[key]=tonumber(format[key])
 137                 end
 138             end
 139             local s = format.url:match('FNC_([%w%p]-)%.')
 140             if s then
 141                 format.description=string.lower(s)
 142             end
 143             table.insert(t, format)
 144         end
 145     end
 146
 147     return t
 148 end
 149
 150 function Foxnews.iter_thumbnails_js(page, U)
 151     local thumbs = Foxnews.find_set(page, '"media%-thumbnail"')
 152     if not thumbs then
 153         return {}
 154     end
 155
 156     local t = {}
 157     for attrs in thumbs:gmatch('"@attributes":(%b{})') do
 158         local thumb = {}
 159         for key,value in attrs:gmatch('"(.-)":"(.-)"') do
 160             thumb[key]=value
 161             end
 162         table.insert(t, thumb)
 163     end
 164
 165     return t
 166 end
 167
 168 function Foxnews.choose_default(formats) -- Lowest quality available
 169     local r = {width=0xffff, height=0xffff, url=nil, bitrate=0xfffffffffff}
 170     local U = require 'quvi/util'
 171     for _,v in pairs(formats) do
 172         if U.is_lower_quality(v,r) then
 173             r = v
 174         end
 175     end
 176 --    for k,v in pairs(r) do print(k,v) end
 177     return r
 178 end
 179
 180 function Foxnews.choose_best(formats) -- Highest quality available
 181     local r = {width=0, height=0, url=nil, bitrate=-1}
 182     local U = require 'quvi/util'
 183     for _,v in pairs(formats) do
 184         if U.is_higher_quality(v,r) then
 185             r = v
 186         end
 187     end
 188 --    for k,v in pairs(r) do print(k,v) end
 189     return r
 190 end
 191
 192 function Foxnews.to_s(t)
 193     if t.description then
 194         return t.description
 195     else
 196         return string.format("%s_%sp", t.width, t.height)
 197     end
 198 end
 199
 200 function Foxnews.find_set(str, label)
 201     local _, _, r = str:find(label .. ':(%b[])')
 202     if not r then
 203         _, _, r = str:find(label .. ':(%b{})')
 204     end
 205     return r
 206 end
 207
 208 -- Local Variables: **
 209 -- indent-tabs-mode: () **
 210 -- lua-indent-level: 4 **
 211 -- End: **
 212 -- vim: set ts=4 sw=4 tw=72 expandtab: