Implement importing group session data

olm_import_inbound_group_session, which reads the format written by
olm_export_inbound_group_session to initialise a group session.

2 files changed, 36 insertions, 0 deletions

diff --git a/python/olm/__main__.py b/python/olm/__main__.py
index f195591..5f78f76 100755
--- a/python/olm/__main__.py
+++ b/python/olm/__main__.py
@@ -268,6 +268,19 @@ def build_arg_parser():
                                default=sys.stdin)
     inbound_group.set_defaults(func=do_inbound_group)
 
+    import_inbound_group = commands.add_parser(
+        "import_inbound_group",
+        help="Create an inbound group session based an exported inbound group"
+    )
+    import_inbound_group.add_argument("session_file", help="Local inbound group session file")
+    import_inbound_group.add_argument(
+        "export_file",
+        help="File to read credentials from (default stdin)",
+        type=argparse.FileType('r'), nargs='?',
+        default=sys.stdin,
+    )
+    import_inbound_group.set_defaults(func=do_import_inbound_group)
+
     group_decrypt = commands.add_parser("group_decrypt", help="Decrypt a group message")
     group_decrypt.add_argument("session_file", help="Local inbound group session file")
     group_decrypt.add_argument("message_file", help="Message file (default stdin)",
@@ -345,6 +358,19 @@ def do_inbound_group(args):
     with open(args.session_file, "wb") as f:
         f.write(session.pickle(args.key))
 
+def do_import_inbound_group(args):
+    if os.path.exists(args.session_file):
+        sys.stderr.write("Session %r file already exists\n" % (
+            args.session_file,
+        ))
+        sys.exit(1)
+    data = args.export_file.read().translate(None, "\r\n")
+
+    session = InboundGroupSession()
+    session.import_session(data)
+    with open(args.session_file, "wb") as f:
+        f.write(session.pickle(args.key))
+
 def do_group_decrypt(args):
     session = InboundGroupSession()
     session.unpickle(args.key, read_base64_file(args.session_file))
diff --git a/python/olm/inbound_group_session.py b/python/olm/inbound_group_session.py
index 67906b2..4390b34 100644
--- a/python/olm/inbound_group_session.py
+++ b/python/olm/inbound_group_session.py
@@ -37,6 +37,10 @@ inbound_group_session_function(
 )
 
 inbound_group_session_function(
+    lib.olm_import_inbound_group_session, c_void_p, c_size_t
+)
+
+inbound_group_session_function(
     lib.olm_group_decrypt_max_plaintext_length, c_void_p, c_size_t
 )
 inbound_group_session_function(
@@ -83,6 +87,12 @@ class InboundGroupSession(object):
             self.ptr, key_buffer, len(session_key)
         )
 
+    def import_session(self, session_key):
+        key_buffer = create_string_buffer(session_key)
+        lib.olm_import_inbound_group_session(
+            self.ptr, key_buffer, len(session_key)
+        )
+
     def decrypt(self, message):
         message_buffer = create_string_buffer(message)
         max_plaintext_length = lib.olm_group_decrypt_max_plaintext_length(