]> git.bitcoin.ninja Git - youtube-dl/blob - youtube_dl/postprocessor/xattrpp.py
Merge pull request #2953 from codesparkle/ndr-regexes-escape-correctly
[youtube-dl] / 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