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