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-rw-r--r--src/leap/soledad/leap.py114
1 files changed, 114 insertions, 0 deletions
diff --git a/src/leap/soledad/leap.py b/src/leap/soledad/leap.py
new file mode 100644
index 00000000..08330618
--- /dev/null
+++ b/src/leap/soledad/leap.py
@@ -0,0 +1,114 @@
+try:
+ import simplejson as json
+except ImportError:
+ import json # noqa
+
+from u1db import Document
+from u1db.remote.http_target import HTTPSyncTarget
+import base64
+
+
+class LeapDocument(Document):
+ """
+ LEAP Documents are standard u1db documents with cabability of returning an
+ encrypted version of the document json string as well as setting document
+ content based on an encrypted version of json string.
+ """
+
+ def __init__(self, doc_id=None, rev=None, json='{}', has_conflicts=False,
+ encrypted_json=None):
+ super(Document, self).__init__(doc_id, rev, json, has_conflicts)
+ if encrypted_json:
+ self.set_encrypted_json(encrypted_json)
+
+ def get_encrypted_json(self):
+ """
+ Returns document's json serialization encrypted with user's public key.
+ """
+ # TODO: replace for openpgp encryption with users's pub key.
+ return base64.b64encode(self.get_json())
+
+ def set_encrypted_json(self):
+ """
+ Set document's content based on encrypted version of json string.
+ """
+ # TODO:
+ # - replace for openpgp decryption using user's priv key.
+ # - raise error if unsuccessful.
+ return self.set_json(base64.b64decode(self.get_json()))
+
+
+class LeapSyncTarget(HTTPSyncTarget):
+
+ def _parse_sync_stream(self, data, return_doc_cb, ensure_callback=None):
+ parts = data.splitlines() # one at a time
+ if not parts or parts[0] != '[':
+ raise BrokenSyncStream
+ data = parts[1:-1]
+ comma = False
+ if data:
+ line, comma = utils.check_and_strip_comma(data[0])
+ res = json.loads(line)
+ if ensure_callback and 'replica_uid' in res:
+ ensure_callback(res['replica_uid'])
+ for entry in data[1:]:
+ if not comma: # missing in between comma
+ raise BrokenSyncStream
+ line, comma = utils.check_and_strip_comma(entry)
+ entry = json.loads(line)
+ doc = LeapDocument(entry['id'], entry['rev'],
+ encrypted_json=entry['content'])
+ return_doc_cb(doc, entry['gen'], entry['trans_id'])
+ if parts[-1] != ']':
+ try:
+ partdic = json.loads(parts[-1])
+ except ValueError:
+ pass
+ else:
+ if isinstance(partdic, dict):
+ self._error(partdic)
+ raise BrokenSyncStream
+ if not data or comma: # no entries or bad extra comma
+ raise BrokenSyncStream
+ return res
+
+ def sync_exchange(self, docs_by_generations, source_replica_uid,
+ last_known_generation, last_known_trans_id,
+ return_doc_cb, ensure_callback=None):
+ self._ensure_connection()
+ if self._trace_hook: # for tests
+ self._trace_hook('sync_exchange')
+ url = '%s/sync-from/%s' % (self._url.path, source_replica_uid)
+ self._conn.putrequest('POST', url)
+ self._conn.putheader('content-type', 'application/x-u1db-sync-stream')
+ for header_name, header_value in self._sign_request('POST', url, {}):
+ self._conn.putheader(header_name, header_value)
+ entries = ['[']
+ size = 1
+
+ def prepare(**dic):
+ entry = comma + '\r\n' + json.dumps(dic)
+ entries.append(entry)
+ return len(entry)
+
+ comma = ''
+ size += prepare(
+ last_known_generation=last_known_generation,
+ last_known_trans_id=last_known_trans_id,
+ ensure=ensure_callback is not None)
+ comma = ','
+ for doc, gen, trans_id in docs_by_generations:
+ size += prepare(id=doc.doc_id, rev=doc.rev,
+ content=doc.get_encrypted_json(),
+ gen=gen, trans_id=trans_id)
+ entries.append('\r\n]')
+ size += len(entries[-1])
+ self._conn.putheader('content-length', str(size))
+ self._conn.endheaders()
+ for entry in entries:
+ self._conn.send(entry)
+ entries = None
+ data, _ = self._response()
+ res = self._parse_sync_stream(data, return_doc_cb, ensure_callback)
+ data = None
+ return res['new_generation'], res['new_transaction_id']