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

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