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scrub.py
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scrub.py
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# This file is part of beets.
# Copyright 2016, Adrian Sampson.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
"""Cleans extraneous metadata from files' tags via a command or
automatically whenever tags are written.
"""
from beets.plugins import BeetsPlugin
from beets import ui
from beets import util
from beets import config
import mediafile
import mutagen
_MUTAGEN_FORMATS = {
'asf': 'ASF',
'apev2': 'APEv2File',
'flac': 'FLAC',
'id3': 'ID3FileType',
'mp3': 'MP3',
'mp4': 'MP4',
'oggflac': 'OggFLAC',
'oggspeex': 'OggSpeex',
'oggtheora': 'OggTheora',
'oggvorbis': 'OggVorbis',
'oggopus': 'OggOpus',
'trueaudio': 'TrueAudio',
'wavpack': 'WavPack',
'monkeysaudio': 'MonkeysAudio',
'optimfrog': 'OptimFROG',
}
class ScrubPlugin(BeetsPlugin):
"""Removes extraneous metadata from files' tags."""
def __init__(self):
super().__init__()
self.config.add({
'auto': True,
})
if self.config['auto']:
self.register_listener("import_task_files", self.import_task_files)
def commands(self):
def scrub_func(lib, opts, args):
# Walk through matching files and remove tags.
for item in lib.items(ui.decargs(args)):
self._log.info('scrubbing: {0}',
util.displayable_path(item.path))
self._scrub_item(item, opts.write)
scrub_cmd = ui.Subcommand('scrub', help='clean audio tags')
scrub_cmd.parser.add_option(
'-W', '--nowrite', dest='write',
action='store_false', default=True,
help='leave tags empty')
scrub_cmd.func = scrub_func
return [scrub_cmd]
@staticmethod
def _mutagen_classes():
"""Get a list of file type classes from the Mutagen module.
"""
classes = []
for modname, clsname in _MUTAGEN_FORMATS.items():
mod = __import__(f'mutagen.{modname}',
fromlist=[clsname])
classes.append(getattr(mod, clsname))
return classes
def _scrub(self, path):
"""Remove all tags from a file.
"""
for cls in self._mutagen_classes():
# Try opening the file with this type, but just skip in the
# event of any error.
try:
f = cls(util.syspath(path))
except Exception:
continue
if f.tags is None:
continue
# Remove the tag for this type.
try:
f.delete()
except NotImplementedError:
# Some Mutagen metadata subclasses (namely, ASFTag) do not
# support .delete(), presumably because it is impossible to
# remove them. In this case, we just remove all the tags.
for tag in f.keys():
del f[tag]
f.save()
except (OSError, mutagen.MutagenError) as exc:
self._log.error('could not scrub {0}: {1}',
util.displayable_path(path), exc)
def _scrub_item(self, item, restore=True):
"""Remove tags from an Item's associated file and, if `restore`
is enabled, write the database's tags back to the file.
"""
# Get album art if we need to restore it.
if restore:
try:
mf = mediafile.MediaFile(util.syspath(item.path),
config['id3v23'].get(bool))
except mediafile.UnreadableFileError as exc:
self._log.error('could not open file to scrub: {0}',
exc)
return
images = mf.images
# Remove all tags.
self._scrub(item.path)
# Restore tags, if enabled.
if restore:
self._log.debug('writing new tags after scrub')
item.try_write()
if images:
self._log.debug('restoring art')
try:
mf = mediafile.MediaFile(util.syspath(item.path),
config['id3v23'].get(bool))
mf.images = images
mf.save()
except mediafile.UnreadableFileError as exc:
self._log.error('could not write tags: {0}', exc)
def import_task_files(self, session, task):
"""Automatically scrub imported files."""
for item in task.imported_items():
self._log.debug('auto-scrubbing {0}',
util.displayable_path(item.path))
self._scrub_item(item)