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import os
from .common import PostProcessor
from ..compat import compat_os_name
from ..utils import (
PostProcessingError,
XAttrMetadataError,
XAttrUnavailableError,
hyphenate_date,
write_xattr,
)
class XAttrMetadataPP(PostProcessor):
"""Set extended attributes on downloaded file (if xattr support is found)
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'
"""
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',
}
def run(self, info):
mtime = os.stat(info['filepath']).st_mtime
self.to_screen('Writing metadata to file\'s xattrs')
try:
for xattrname, infoname in self.XATTR_MAPPING.items():
value = info.get(infoname)
if value:
if infoname == 'upload_date':
value = hyphenate_date(value)
write_xattr(info['filepath'], xattrname, value.encode())
except XAttrUnavailableError as e:
raise PostProcessingError(str(e))
except XAttrMetadataError as e:
if e.reason == 'NO_SPACE':
self.report_warning(
'There\'s no disk space left, disk quota exceeded or filesystem xattr limit exceeded. '
'Some extended attributes are not written')
elif e.reason == 'VALUE_TOO_LONG':
self.report_warning('Unable to write extended attributes due to too long values.')
else:
tip = ('You need to use NTFS' if compat_os_name == 'nt'
else 'You may have to enable them in your "/etc/fstab"')
raise PostProcessingError(f'This filesystem doesn\'t support extended attributes. {tip}')
self.try_utime(info['filepath'], mtime, mtime)
return [], info
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