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- import os
- import subprocess
- import sys
-
- from .common import PostProcessor
- from ..compat import (
- subprocess_check_output
- )
- from ..utils import (
- check_executable,
- hyphenate_date,
- )
-
-
- class XAttrMetadataPP(PostProcessor):
-
- #
- # More info about extended attributes for media:
- # http://freedesktop.org/wiki/CommonExtendedAttributes/
- # http://www.freedesktop.org/wiki/PhreedomDraft/
- # http://dublincore.org/documents/usageguide/elements.shtml
- #
- # TODO:
- # * capture youtube keywords and put them in 'user.dublincore.subject' (comma-separated)
- # * figure out which xattrs can be used for 'duration', 'thumbnail', 'resolution'
- #
-
- def run(self, info):
- """ Set extended attributes on downloaded file (if xattr support is found). """
-
- # This mess below finds the best xattr tool for the job and creates a
- # "write_xattr" function.
- try:
- # try the pyxattr module...
- import xattr
-
- def write_xattr(path, key, value):
- return xattr.setxattr(path, key, value)
-
- except ImportError:
- if os.name == 'nt':
- # Write xattrs to NTFS Alternate Data Streams:
- # http://en.wikipedia.org/wiki/NTFS#Alternate_data_streams_.28ADS.29
- def write_xattr(path, key, value):
- assert ':' not in key
- assert os.path.exists(path)
-
- ads_fn = path + ":" + key
- with open(ads_fn, "wb") as f:
- f.write(value)
- else:
- user_has_setfattr = check_executable("setfattr", ['--version'])
- user_has_xattr = check_executable("xattr", ['-h'])
-
- if user_has_setfattr or user_has_xattr:
-
- def write_xattr(path, key, value):
- if user_has_setfattr:
- cmd = ['setfattr', '-n', key, '-v', value, path]
- elif user_has_xattr:
- cmd = ['xattr', '-w', key, value, path]
-
- subprocess_check_output(cmd)
-
- else:
- # On Unix, and can't find pyxattr, setfattr, or xattr.
- if sys.platform.startswith('linux'):
- self._downloader.report_error(
- "Couldn't find a tool to set the xattrs. "
- "Install either the python 'pyxattr' or 'xattr' "
- "modules, or the GNU 'attr' package "
- "(which contains the 'setfattr' tool).")
- else:
- self._downloader.report_error(
- "Couldn't find a tool to set the xattrs. "
- "Install either the python 'xattr' module, "
- "or the 'xattr' binary.")
-
- # Write the metadata to the file's xattrs
- self._downloader.to_screen('[metadata] Writing metadata to file\'s xattrs')
-
- filename = info['filepath']
-
- try:
- xattr_mapping = {
- 'user.xdg.referrer.url': 'webpage_url',
- # 'user.xdg.comment': 'description',
- 'user.dublincore.title': 'title',
- 'user.dublincore.date': 'upload_date',
- 'user.dublincore.description': 'description',
- 'user.dublincore.contributor': 'uploader',
- 'user.dublincore.format': 'format',
- }
-
- for xattrname, infoname in xattr_mapping.items():
-
- value = info.get(infoname)
-
- if value:
- if infoname == "upload_date":
- value = hyphenate_date(value)
-
- byte_value = value.encode('utf-8')
- write_xattr(filename, xattrname, byte_value)
-
- return True, info
-
- except (subprocess.CalledProcessError, OSError):
- self._downloader.report_error("This filesystem doesn't support extended attributes. (You may have to enable them in your /etc/fstab)")
- return False, info
-
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