Raphaël G. Git Repositories - youtubedl/blob - youtube_dl/postprocessor/xattrpp.py

   1 import os
   2 import subprocess
   3 import sys
   4
   5 from .common import PostProcessor
   6 from ..utils import (
   7     check_executable,
   8     hyphenate_date,
   9     subprocess_check_output
  10 )
  11
  12
  13 class XAttrMetadataPP(PostProcessor):
  14
  15     #
  16     # More info about extended attributes for media:
  17     #   http://freedesktop.org/wiki/CommonExtendedAttributes/
  18     #   http://www.freedesktop.org/wiki/PhreedomDraft/
  19     #   http://dublincore.org/documents/usageguide/elements.shtml
  20     #
  21     # TODO:
  22     #  * capture youtube keywords and put them in 'user.dublincore.subject' (comma-separated)
  23     #  * figure out which xattrs can be used for 'duration', 'thumbnail', 'resolution'
  24     #
  25
  26     def run(self, info):
  27         """ Set extended attributes on downloaded file (if xattr support is found). """
  28
  29         # This mess below finds the best xattr tool for the job and creates a
  30         # "write_xattr" function.
  31         try:
  32             # try the pyxattr module...
  33             import xattr
  34
  35             def write_xattr(path, key, value):
  36                 return xattr.setxattr(path, key, value)
  37
  38         except ImportError:
  39             if os.name == 'nt':
  40                 # Write xattrs to NTFS Alternate Data Streams:
  41                 # http://en.wikipedia.org/wiki/NTFS#Alternate_data_streams_.28ADS.29
  42                 def write_xattr(path, key, value):
  43                     assert ':' not in key
  44                     assert os.path.exists(path)
  45
  46                     ads_fn = path + ":" + key
  47                     with open(ads_fn, "wb") as f:
  48                         f.write(value)
  49             else:
  50                 user_has_setfattr = check_executable("setfattr", ['--version'])
  51                 user_has_xattr = check_executable("xattr", ['-h'])
  52
  53                 if user_has_setfattr or user_has_xattr:
  54
  55                     def write_xattr(path, key, value):
  56                         if user_has_setfattr:
  57                             cmd = ['setfattr', '-n', key, '-v', value, path]
  58                         elif user_has_xattr:
  59                             cmd = ['xattr', '-w', key, value, path]
  60
  61                         subprocess_check_output(cmd)
  62
  63                 else:
  64                     # On Unix, and can't find pyxattr, setfattr, or xattr.
  65                     if sys.platform.startswith('linux'):
  66                         self._downloader.report_error(
  67                             "Couldn't find a tool to set the xattrs. "
  68                             "Install either the python 'pyxattr' or 'xattr' "
  69                             "modules, or the GNU 'attr' package "
  70                             "(which contains the 'setfattr' tool).")
  71                     else:
  72                         self._downloader.report_error(
  73                             "Couldn't find a tool to set the xattrs. "
  74                             "Install either the python 'xattr' module, "
  75                             "or the 'xattr' binary.")
  76
  77         # Write the metadata to the file's xattrs
  78         self._downloader.to_screen('[metadata] Writing metadata to file\'s xattrs')
  79
  80         filename = info['filepath']
  81
  82         try:
  83             xattr_mapping = {
  84                 'user.xdg.referrer.url': 'webpage_url',
  85                 # 'user.xdg.comment':            'description',
  86                 'user.dublincore.title': 'title',
  87                 'user.dublincore.date': 'upload_date',
  88                 'user.dublincore.description': 'description',
  89                 'user.dublincore.contributor': 'uploader',
  90                 'user.dublincore.format': 'format',
  91             }
  92
  93             for xattrname, infoname in xattr_mapping.items():
  94
  95                 value = info.get(infoname)
  96
  97                 if value:
  98                     if infoname == "upload_date":
  99                         value = hyphenate_date(value)
 100
 101                     byte_value = value.encode('utf-8')
 102                     write_xattr(filename, xattrname, byte_value)
 103
 104             return True, info
 105
 106         except (subprocess.CalledProcessError, OSError):
 107             self._downloader.report_error("This filesystem doesn't support extended attributes. (You may have to enable them in your /etc/fstab)")
 108             return False, info
 109