708 lines
23 KiB
Python
708 lines
23 KiB
Python
# ankisyncd - A personal Anki sync server
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# Copyright (C) 2013 David Snopek
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from ConfigParser import SafeConfigParser
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from webob.dec import wsgify
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from webob.exc import *
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from webob import Response
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import os
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import hashlib
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import json
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import logging
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import random
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import string
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import unicodedata
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import zipfile
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from sqlite3 import dbapi2 as sqlite
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import ankisyncd
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import anki
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import anki.db
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import anki.sync
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import anki.utils
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from anki.consts import SYNC_ZIP_SIZE, SYNC_ZIP_COUNT
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from ankisyncd.users import SimpleUserManager, SqliteUserManager
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try:
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from cStringIO import StringIO
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except ImportError:
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from StringIO import StringIO
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def old_client(cv):
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if not cv:
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return False
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note = {"alpha": 0, "beta": 0}
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client, version, platform = cv.split(',')
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for name in note.keys():
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if name in version:
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vs = version.split(name)
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version = vs[0]
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note[name] = int(vs[-1])
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version_int = [int(x) for x in version.split('.')]
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if client == 'ankidesktop':
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return version_int < [2, 0, 27]
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elif client == 'ankidroid':
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if version_int == [2, 3]:
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if note["alpha"]:
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return note["alpha"] < 4
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else:
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return version_int < [2, 2, 3]
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else: # unknown client, assume current version
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return False
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class SyncCollectionHandler(anki.sync.Syncer):
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operations = ['meta', 'applyChanges', 'start', 'chunk', 'applyChunk', 'sanityCheck2', 'finish']
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def __init__(self, col):
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# So that 'server' (the 3rd argument) can't get set
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anki.sync.Syncer.__init__(self, col)
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def meta(self):
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# Make sure the media database is open!
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if self.col.media.db is None:
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self.col.media.connect()
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return {
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'scm': self.col.scm,
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'ts': anki.utils.intTime(),
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'mod': self.col.mod,
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'usn': self.col._usn,
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'musn': self.col.media.lastUsn(),
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'msg': '',
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'cont': True,
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}
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class SyncMediaHandler(anki.sync.MediaSyncer):
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operations = ['begin', 'mediaChanges', 'mediaSanity', 'uploadChanges', 'downloadFiles']
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def __init__(self, col):
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anki.sync.MediaSyncer.__init__(self, col)
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def begin(self, skey):
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return {
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'data': {
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'sk': skey,
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'usn': self.col.media.lastUsn(),
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},
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'err': '',
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}
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def uploadChanges(self, data):
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"""
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The zip file contains files the client hasn't synced with the server
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yet ('dirty'), and info on files it has deleted from its own media dir.
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"""
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self._check_zip_data(data)
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processed_count = self._adopt_media_changes_from_zip(data)
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# We increment our lastUsn once for each file we processed.
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# (lastUsn - processed_count) must equal the client's lastUsn.
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our_last_usn = self.col.media.lastUsn()
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self.col.media.setLastUsn(our_last_usn + processed_count)
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return {
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'data': [processed_count, self.col.media.lastUsn()],
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'err': '',
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}
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@staticmethod
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def _check_zip_data(zip_data):
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max_zip_size = 100*1024*1024
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max_meta_file_size = 100000
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file_buffer = StringIO(zip_data)
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zip_file = zipfile.ZipFile(file_buffer, 'r')
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meta_file_size = zip_file.getinfo("_meta").file_size
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sum_file_sizes = sum(info.file_size for info in zip_file.infolist())
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zip_file.close()
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file_buffer.close()
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if meta_file_size > max_meta_file_size:
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raise ValueError("Zip file's metadata file is larger than %s "
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"Bytes." % max_meta_file_size)
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elif sum_file_sizes > max_zip_size:
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raise ValueError("Zip file contents are larger than %s Bytes." %
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max_zip_size)
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def _adopt_media_changes_from_zip(self, zip_data):
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"""
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Adds and removes files to/from the database and media directory
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according to the data in zip file zipData.
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"""
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file_buffer = StringIO(zip_data)
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zip_file = zipfile.ZipFile(file_buffer, 'r')
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# Get meta info first.
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meta = json.loads(zip_file.read("_meta"))
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# Remove media files that were removed on the client.
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media_to_remove = []
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for normname, ordinal in meta:
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if ordinal == '':
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media_to_remove.append(self._normalize_filename(normname))
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# Add media files that were added on the client.
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media_to_add = []
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for i in zip_file.infolist():
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if i.filename == "_meta": # Ignore previously retrieved metadata.
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continue
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else:
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file_data = zip_file.read(i)
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csum = anki.utils.checksum(file_data)
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filename = self._normalize_filename(meta[int(i.filename)][0])
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file_path = os.path.join(self.col.media.dir(), filename)
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# Save file to media directory.
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open(file_path, 'wb').write(file_data)
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mtime = self.col.media._mtime(file_path)
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media_to_add.append((filename, csum, mtime, 0))
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# We count all files we are to remove, even if we don't have them in
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# our media directory and our db doesn't know about them.
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processed_count = len(media_to_remove) + len(media_to_add)
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assert len(meta) == processed_count # sanity check
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if media_to_remove:
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self._remove_media_files(media_to_remove)
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if media_to_add:
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self.col.media.db.executemany(
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"INSERT OR REPLACE INTO media VALUES (?,?,?,?)", media_to_add)
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return processed_count
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@staticmethod
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def _normalize_filename(filename):
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"""
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Performs unicode normalization for file names. Logic taken from Anki's
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MediaManager.addFilesFromZip().
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"""
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if not isinstance(filename, unicode):
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filename = unicode(filename, "utf8")
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# Normalize name for platform.
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if anki.utils.isMac: # global
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filename = unicodedata.normalize("NFD", filename)
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else:
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filename = unicodedata.normalize("NFC", filename)
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return filename
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def _remove_media_files(self, filenames):
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"""
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Marks all files in list filenames as deleted and removes them from the
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media directory.
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"""
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# Mark the files as deleted in our db.
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self.col.media.db.executemany("UPDATE media " +
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"SET csum = NULL " +
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" WHERE fname = ?",
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[(f, ) for f in filenames])
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# Remove the files from our media directory if it is present.
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logging.debug('Removing %d files from media dir.' % len(filenames))
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for filename in filenames:
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try:
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os.remove(os.path.join(self.col.media.dir(), filename))
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except OSError as err:
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logging.error("Error when removing file '%s' from media dir: "
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"%s" % (filename, str(err)))
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def downloadFiles(self, files):
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import zipfile
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flist = {}
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cnt = 0
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sz = 0
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f = StringIO()
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z = zipfile.ZipFile(f, "w", compression=zipfile.ZIP_DEFLATED)
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for fname in files:
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z.write(os.path.join(self.col.media.dir(), fname), str(cnt))
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flist[str(cnt)] = fname
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sz += os.path.getsize(os.path.join(self.col.media.dir(), fname))
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if sz > SYNC_ZIP_SIZE or cnt > SYNC_ZIP_COUNT:
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break
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cnt += 1
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z.writestr("_meta", json.dumps(flist))
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z.close()
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return f.getvalue()
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def mediaChanges(self, lastUsn):
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result = []
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usn = self.col.media.lastUsn()
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fname = csum = None
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if lastUsn < usn or lastUsn == 0:
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for fname,mtime,csum, in self.col.media.db.execute("select fname,mtime,csum from media"):
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result.append([fname, usn, csum])
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return {'data': result, 'err': ''}
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def mediaSanity(self, local=None):
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if self.col.media.mediaCount() == local:
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result = "OK"
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else:
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result = "FAILED"
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return {'data': result, 'err':''}
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class SyncUserSession(object):
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def __init__(self, name, path, collection_manager, setup_new_collection=None):
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import time
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self.skey = self._generate_session_key()
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self.name = name
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self.path = path
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self.collection_manager = collection_manager
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self.setup_new_collection = setup_new_collection
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self.version = None
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self.client_version = None
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self.created = time.time()
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self.collection_handler = None
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self.media_handler = None
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# make sure the user path exists
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if not os.path.exists(path):
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os.mkdir(path)
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def _generate_session_key(self):
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return anki.utils.checksum(str(random.random()))[:8]
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def get_collection_path(self):
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return os.path.realpath(os.path.join(self.path, 'collection.anki2'))
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def get_thread(self):
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return self.collection_manager.get_collection(self.get_collection_path(), self.setup_new_collection)
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def get_handler_for_operation(self, operation, col):
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if operation in SyncCollectionHandler.operations:
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attr, handler_class = 'collection_handler', SyncCollectionHandler
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elif operation in SyncMediaHandler.operations:
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attr, handler_class = 'media_handler', SyncMediaHandler
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else:
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raise Exception("no handler for {}".format(operation))
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if getattr(self, attr) is None:
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setattr(self, attr, handler_class(col))
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handler = getattr(self, attr)
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# The col object may actually be new now! This happens when we close a collection
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# for inactivity and then later re-open it (creating a new Collection object).
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handler.col = col
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return handler
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class SimpleSessionManager(object):
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"""A simple session manager that keeps the sessions in memory."""
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def __init__(self):
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self.sessions = {}
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def load(self, hkey, session_factory=None):
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return self.sessions.get(hkey)
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def load_from_skey(self, skey, session_factory=None):
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for i in self.sessions:
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if self.sessions[i].skey == skey:
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return self.sessions[i]
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def save(self, hkey, session):
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self.sessions[hkey] = session
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def delete(self, hkey):
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del self.sessions[hkey]
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class SyncApp(object):
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valid_urls = SyncCollectionHandler.operations + SyncMediaHandler.operations + ['hostKey', 'upload', 'download']
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def __init__(self, config):
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from ankisyncd.thread import getCollectionManager
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self.data_root = os.path.abspath(config.get("sync_app", "data_root"))
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self.base_url = config.get("sync_app", "base_url")
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self.base_media_url = config.get("sync_app", "base_media_url")
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self.setup_new_collection = None
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self.hook_pre_sync = None
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self.hook_post_sync = None
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self.hook_download = None
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self.hook_upload = None
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if config.has_option("sync_app", "session_db_path"):
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self.session_manager = SqliteSessionManager(config.get("sync_app", "session_db_path"))
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else:
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self.session_manager = SimpleSessionManager()
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if config.has_option("sync_app", "auth_db_path"):
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self.user_manager = SqliteUserManager(config.get("sync_app", "auth_db_path"))
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else:
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logging.warn("auth_db_path not set, ankisyncd will accept any password")
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self.user_manager = SimpleUserManager()
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self.collection_manager = getCollectionManager()
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# make sure the base_url has a trailing slash
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if not self.base_url.endswith('/'):
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self.base_url += '/'
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if not self.base_media_url.endswith('/'):
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self.base_media_url += '/'
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def generateHostKey(self, username):
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"""Generates a new host key to be used by the given username to identify their session.
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This values is random."""
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import hashlib, time, random, string
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chars = string.ascii_letters + string.digits
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val = ':'.join([username, str(int(time.time())), ''.join(random.choice(chars) for x in range(8))])
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return hashlib.md5(val).hexdigest()
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def create_session(self, username, user_path):
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return SyncUserSession(username, user_path, self.collection_manager, self.setup_new_collection)
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def _decode_data(self, data, compression=0):
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import gzip
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if compression:
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buf = gzip.GzipFile(mode="rb", fileobj=StringIO(data))
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data = buf.read()
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buf.close()
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try:
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data = json.loads(data)
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except ValueError:
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data = {'data': data}
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return data
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def operation_hostKey(self, username, password):
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if not self.user_manager.authenticate(username, password):
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return
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dirname = self.user_manager.userdir(username)
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if dirname is None:
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return
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hkey = self.generateHostKey(username)
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user_path = os.path.join(self.data_root, dirname)
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session = self.create_session(username, user_path)
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self.session_manager.save(hkey, session)
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return {'key': hkey}
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def operation_upload(self, col, data, session):
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# Verify integrity of the received database file before replacing our
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# existing db.
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temp_db_path = session.get_collection_path() + ".tmp"
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with open(temp_db_path, 'wb') as f:
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f.write(data)
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try:
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test_db = anki.db.DB(temp_db_path)
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if test_db.scalar("pragma integrity_check") != "ok":
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raise HTTPBadRequest("Integrity check failed for uploaded "
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"collection database file.")
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test_db.close()
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except sqlite.Error as e:
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raise HTTPBadRequest("Uploaded collection database file is "
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"corrupt.")
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# Overwrite existing db.
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col.close()
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try:
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os.rename(temp_db_path, session.get_collection_path())
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finally:
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col.reopen()
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col.load()
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# If everything went fine, run hook_upload if one is defined.
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if self.hook_upload is not None:
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self.hook_upload(col, session)
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return "OK"
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def operation_download(self, col, session):
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# run hook_download if one is defined
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if self.hook_download is not None:
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self.hook_download(col, session)
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col.close()
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try:
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data = open(session.get_collection_path(), 'rb').read()
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finally:
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col.reopen()
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col.load()
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return data
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@wsgify
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def __call__(self, req):
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# Get and verify the session
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try:
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hkey = req.POST['k']
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except KeyError:
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hkey = None
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session = self.session_manager.load(hkey, self.create_session)
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if session is None:
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try:
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skey = req.POST['sk']
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session = self.session_manager.load_from_skey(skey, self.create_session)
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except KeyError:
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skey = None
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try:
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compression = int(req.POST['c'])
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except KeyError:
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compression = 0
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try:
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data = req.POST['data'].file.read()
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data = self._decode_data(data, compression)
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except KeyError:
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data = {}
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except ValueError:
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# Bad JSON
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raise HTTPBadRequest()
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if req.path.startswith(self.base_url):
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url = req.path[len(self.base_url):]
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if url not in self.valid_urls:
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raise HTTPNotFound()
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if url == 'hostKey':
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result = self.operation_hostKey(data.get("u"), data.get("p"))
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if result:
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return json.dumps(result)
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else:
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# TODO: do I have to pass 'null' for the client to receive None?
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raise HTTPForbidden('null')
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if session is None:
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raise HTTPForbidden()
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if url in SyncCollectionHandler.operations + SyncMediaHandler.operations:
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# 'meta' passes the SYNC_VER but it isn't used in the handler
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if url == 'meta':
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if session.skey == None and req.POST.has_key('s'):
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session.skey = req.POST['s']
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if data.has_key('v'):
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session.version = data['v']
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del data['v']
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if data.has_key('cv'):
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session.client_version = data['cv']
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del data['cv']
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if old_client(session.client_version):
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return Response(status="501") # client needs upgrade
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self.session_manager.save(hkey, session)
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session = self.session_manager.load(hkey, self.create_session)
|
|
|
|
thread = session.get_thread()
|
|
|
|
# run hook_pre_sync if one is defined
|
|
if url == 'start':
|
|
if self.hook_pre_sync is not None:
|
|
thread.execute(self.hook_pre_sync, [session])
|
|
|
|
result = self._execute_handler_method_in_thread(url, data, session)
|
|
|
|
# If it's a complex data type, we convert it to JSON
|
|
if type(result) not in (str, unicode):
|
|
result = json.dumps(result)
|
|
|
|
if url == 'finish':
|
|
# TODO: Apparently 'finish' isn't when we're done because 'mediaList' comes
|
|
# after it... When can we possibly delete the session?
|
|
#self.session_manager.delete(hkey)
|
|
|
|
# run hook_post_sync if one is defined
|
|
if self.hook_post_sync is not None:
|
|
thread.execute(self.hook_post_sync, [session])
|
|
|
|
return result
|
|
|
|
elif url == 'upload':
|
|
thread = session.get_thread()
|
|
result = thread.execute(self.operation_upload, [data['data'], session])
|
|
return result
|
|
|
|
elif url == 'download':
|
|
thread = session.get_thread()
|
|
result = thread.execute(self.operation_download, [session])
|
|
return result
|
|
|
|
# This was one of our operations but it didn't get handled... Oops!
|
|
raise HTTPInternalServerError()
|
|
|
|
# media sync
|
|
elif req.path.startswith(self.base_media_url):
|
|
if session is None:
|
|
raise HTTPForbidden()
|
|
|
|
url = req.path[len(self.base_media_url):]
|
|
|
|
if url not in self.valid_urls:
|
|
raise HTTPNotFound()
|
|
|
|
if url == "begin":
|
|
data['skey'] = session.skey
|
|
|
|
result = self._execute_handler_method_in_thread(url, data, session)
|
|
|
|
# If it's a complex data type, we convert it to JSON
|
|
if type(result) not in (str, unicode):
|
|
result = json.dumps(result)
|
|
|
|
return result
|
|
|
|
return "Anki Sync Server"
|
|
|
|
@staticmethod
|
|
def _execute_handler_method_in_thread(method_name, keyword_args, session):
|
|
"""
|
|
Gets and runs the handler method specified by method_name inside the
|
|
thread for session. The handler method will access the collection as
|
|
self.col.
|
|
"""
|
|
|
|
def run_func(col):
|
|
# Retrieve the correct handler method.
|
|
handler = session.get_handler_for_operation(method_name, col)
|
|
handler_method = getattr(handler, method_name)
|
|
|
|
res = handler_method(**keyword_args)
|
|
|
|
col.save()
|
|
return res
|
|
|
|
run_func.func_name = method_name # More useful debugging messages.
|
|
|
|
# Send the closure to the thread for execution.
|
|
thread = session.get_thread()
|
|
result = thread.execute(run_func)
|
|
|
|
return result
|
|
|
|
class SqliteSessionManager(SimpleSessionManager):
|
|
"""Stores sessions in a SQLite database to prevent the user from being logged out
|
|
everytime the SyncApp is restarted."""
|
|
|
|
def __init__(self, session_db_path):
|
|
SimpleSessionManager.__init__(self)
|
|
|
|
self.session_db_path = os.path.abspath(session_db_path)
|
|
|
|
def _conn(self):
|
|
new = not os.path.exists(self.session_db_path)
|
|
conn = sqlite.connect(self.session_db_path)
|
|
if new:
|
|
cursor = conn.cursor()
|
|
cursor.execute("CREATE TABLE session (hkey VARCHAR PRIMARY KEY, skey VARCHAR, user VARCHAR, path VARCHAR)")
|
|
return conn
|
|
|
|
def load(self, hkey, session_factory=None):
|
|
session = SimpleSessionManager.load(self, hkey)
|
|
if session is not None:
|
|
return session
|
|
|
|
conn = self._conn()
|
|
cursor = conn.cursor()
|
|
|
|
cursor.execute("SELECT skey, user, path FROM session WHERE hkey=?", (hkey,))
|
|
res = cursor.fetchone()
|
|
|
|
if res is not None:
|
|
session = self.sessions[hkey] = session_factory(res[1], res[2])
|
|
session.skey = res[0]
|
|
return session
|
|
|
|
def load_from_skey(self, skey, session_factory=None):
|
|
session = SimpleSessionManager.load_from_skey(self, skey)
|
|
if session is not None:
|
|
return session
|
|
|
|
conn = self._conn()
|
|
cursor = conn.cursor()
|
|
|
|
cursor.execute("SELECT hkey, user, path FROM session WHERE skey=?", (skey,))
|
|
res = cursor.fetchone()
|
|
|
|
if res is not None:
|
|
session = self.sessions[res[0]] = session_factory(res[1], res[2])
|
|
session.skey = skey
|
|
return session
|
|
|
|
def save(self, hkey, session):
|
|
SimpleSessionManager.save(self, hkey, session)
|
|
|
|
conn = self._conn()
|
|
cursor = conn.cursor()
|
|
|
|
cursor.execute("INSERT OR REPLACE INTO session (hkey, skey, user, path) VALUES (?, ?, ?, ?)",
|
|
(hkey, session.skey, session.name, session.path))
|
|
conn.commit()
|
|
|
|
def delete(self, hkey):
|
|
SimpleSessionManager.delete(self, hkey)
|
|
|
|
conn = self._conn()
|
|
cursor = conn.cursor()
|
|
|
|
cursor.execute("DELETE FROM session WHERE hkey=?", (hkey,))
|
|
conn.commit()
|
|
|
|
def make_app(global_conf, **local_conf):
|
|
return SyncApp(**local_conf)
|
|
|
|
def main():
|
|
from wsgiref.simple_server import make_server
|
|
from ankisyncd.thread import shutdown
|
|
|
|
config = SafeConfigParser()
|
|
config.read("ankisyncd.conf")
|
|
|
|
ankiserver = SyncApp(config)
|
|
httpd = make_server('', config.getint("sync_app", "port"), ankiserver)
|
|
|
|
try:
|
|
print("Serving HTTP on {} port {}...".format(*httpd.server_address))
|
|
httpd.serve_forever()
|
|
except KeyboardInterrupt:
|
|
print("Exiting...")
|
|
finally:
|
|
shutdown()
|
|
|
|
if __name__ == '__main__': main()
|