125 lines
5.1 KiB
Python
125 lines
5.1 KiB
Python
import os
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import subprocess
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import sys
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from .common import PostProcessor
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from ..utils import (
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hyphenate_date,
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preferredencoding,
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)
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class XAttrMetadataPP(PostProcessor):
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#
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# More info about extended attributes for media:
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# http://freedesktop.org/wiki/CommonExtendedAttributes/
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# http://www.freedesktop.org/wiki/PhreedomDraft/
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# http://dublincore.org/documents/usageguide/elements.shtml
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#
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# TODO:
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# * capture youtube keywords and put them in 'user.dublincore.subject' (comma-separated)
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# * figure out which xattrs can be used for 'duration', 'thumbnail', 'resolution'
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#
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def run(self, info):
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""" Set extended attributes on downloaded file (if xattr support is found). """
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# This mess below finds the best xattr tool for the job and creates a
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# "write_xattr" function.
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try:
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# try the pyxattr module...
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import xattr
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def write_xattr(path, key, value):
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return xattr.setxattr(path, key, value)
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except ImportError:
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if os.name == 'posix':
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def which(bin):
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for dir in os.environ["PATH"].split(":"):
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path = os.path.join(dir, bin)
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if os.path.exists(path):
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return path
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user_has_setfattr = which("setfattr")
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user_has_xattr = which("xattr")
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if user_has_setfattr or user_has_xattr:
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def write_xattr(path, key, value):
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import errno
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potential_errors = {
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# setfattr: /tmp/blah: Operation not supported
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"Operation not supported": errno.EOPNOTSUPP,
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# setfattr: ~/blah: No such file or directory
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# xattr: No such file: ~/blah
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"No such file": errno.ENOENT,
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}
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if user_has_setfattr:
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cmd = ['setfattr', '-n', key, '-v', value, path]
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elif user_has_xattr:
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cmd = ['xattr', '-w', key, value, path]
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try:
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subprocess.check_output(cmd, stderr=subprocess.STDOUT)
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except subprocess.CalledProcessError as e:
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errorstr = e.output.strip().decode()
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for potential_errorstr, potential_errno in potential_errors.items():
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if errorstr.find(potential_errorstr) > -1:
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e = OSError(potential_errno, potential_errorstr)
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e.__cause__ = None
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raise e
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raise # Reraise unhandled error
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else:
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# On Unix, and can't find pyxattr, setfattr, or xattr.
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if sys.platform.startswith('linux'):
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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).")
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elif sys.platform == 'darwin':
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self._downloader.report_error("Couldn't find a tool to set the xattrs. Install either the python 'xattr' module, or the 'xattr' binary.")
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else:
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# Write xattrs to NTFS Alternate Data Streams: http://en.wikipedia.org/wiki/NTFS#Alternate_data_streams_.28ADS.29
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def write_xattr(path, key, value):
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assert(key.find(":") < 0)
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assert(path.find(":") < 0)
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assert(os.path.exists(path))
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ads_fn = path + ":" + key
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with open(ads_fn, "w") as f:
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f.write(value)
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# Write the metadata to the file's xattrs
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self._downloader.to_screen('[metadata] Writing metadata to file\'s xattrs...')
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filename = info['filepath']
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try:
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xattr_mapping = {
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'user.xdg.referrer.url': 'webpage_url',
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# 'user.xdg.comment': 'description',
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'user.dublincore.title': 'title',
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'user.dublincore.date': 'upload_date',
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'user.dublincore.description': 'description',
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'user.dublincore.contributor': 'uploader',
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'user.dublincore.format': 'format',
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}
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for xattrname, infoname in xattr_mapping.items():
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value = info.get(infoname)
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if value:
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if infoname == "upload_date":
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value = hyphenate_date(value)
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byte_value = value.encode(preferredencoding())
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write_xattr(filename, xattrname, byte_value)
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return True, info
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except OSError:
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self._downloader.report_error("This filesystem doesn't support extended attributes. (You may have to enable them in your /etc/fstab)")
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return False, info
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