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import os
import subprocess
import sys
from .common import PostProcessor
from ..utils import (
check_executable,
hyphenate_date,
preferredencoding,
)
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(key.find(":") < 0)
assert(path.find(":") < 0)
assert(os.path.exists(path))
ads_fn = path + ":" + key
with open(ads_fn, "w") 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(preferredencoding())
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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