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from __future__ import unicode_literals
from .common import PostProcessor
from ..compat import compat_os_name
from ..utils import (
hyphenate_date,
write_xattr,
XAttrMetadataError,
XAttrUnavailableError,
)
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). """
# 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',
}
num_written = 0
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)
num_written += 1
return [], info
except XAttrUnavailableError as e:
self._downloader.report_error(str(e))
return [], info
except XAttrMetadataError as e:
if e.reason == 'NO_SPACE':
self._downloader.report_warning(
'There\'s no disk space left, disk quota exceeded or filesystem xattr limit exceeded. ' +
(('Some ' if num_written else '') + 'extended attributes are not written.').capitalize())
elif e.reason == 'VALUE_TOO_LONG':
self._downloader.report_warning(
'Unable to write extended attributes due to too long values.')
else:
msg = 'This filesystem doesn\'t support extended attributes. '
if compat_os_name == 'nt':
msg += 'You need to use NTFS.'
else:
msg += '(You may have to enable them in your /etc/fstab)'
self._downloader.report_error(msg)
return [], info
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