tumblr_backup: add option --cookiefile for youtube-dl

Fixes #132

tumblr_backup.md

@@ -27,6 +27,9 @@ You can see an example of its output [on my home page](http://drbeat.li/tumblr).
 There are two optional dependencies that enable additional features:
 
 1. To backup audio and video, install [youtube-dl](https://rg3.github.io/youtube-dl/).
+   If you need HTTP cookies to download, use an appropriate browser plugin to
+   extract the cookie(s) into a file and use option `--cookiefile=file`. See
+   [issue 132](https://github.com/bbolli/tumblr-utils/issues/132).
 2. To enable EXIF tagging, install [pyexiv2](https://github.com/escaped/pyexiv2).
 
 The fastest option to install these packages is via the package manager of
@@ -54,6 +57,7 @@ feasible, download, build and install from the links above.
     --save-video          save all video files
     --save-video-tumblr   save only Tumblr video files
     --save-audio          save audio files
+    --cookiefile=FILE     cookie file for youtube-dl
     -b, --blosxom         save the posts in blosxom format
     -r, --reverse-month   reverse the post order in the monthly archives
     -R, --reverse-index   reverse the index file order

tumblr_backup.py

@@ -784,7 +784,7 @@ def append_try(elt, fmt=u'%s'):
     def get_youtube_url(self, youtube_url):
         # determine the media file name
         filetmpl = u'%(id)s_%(uploader_id)s_%(title)s.%(ext)s'
-        ydl = youtube_dl.YoutubeDL({
+        ydl_options = {
             'outtmpl': join(self.media_folder, filetmpl),
             'quiet': True, 
             'restrictfilenames': True, 
@@ -794,7 +794,10 @@ def get_youtube_url(self, youtube_url):
             'retries': 3000,		
             'fragment_retries': 3000,
             'ignoreerrors': True
-        })
+        }
+        if options.cookiefile:
+            ydl_options['cookiefile'] = options.cookiefile
+        ydl = youtube_dl.YoutubeDL(ydl_options)
         ydl.add_default_info_extractors()
         try:
             result = ydl.extract_info(youtube_url, download=False)
@@ -1129,6 +1132,7 @@ def request_callback(option, opt, value, parser):
     parser.add_option('--save-video', action='store_true', help="save all video files")
     parser.add_option('--save-video-tumblr', action='store_true', help="save only Tumblr video files")
     parser.add_option('--save-audio', action='store_true', help="save audio files")
+    parser.add_option('--cookiefile', help="cookie file for youtube-dl")
     parser.add_option('-j', '--json', action='store_true',
         help="save the original JSON source"
     )