add forward messages API

python/src/deltachat/account.py

@@ -136,8 +136,8 @@ class Account(object):
         return Chat(self._dc_context, chat_id)
 
     def create_chat_by_message(self, message):
-        """ create or get an existing 1:1 chat object for the specified sender
-        of the specified message.
+        """ create or get an existing chat object for the
+        the specified message.
 
         :param message: messsage id or message instance.
         :returns: a :class:`Chat` object.
@@ -191,6 +191,16 @@ class Account(object):
         msg_ids = ffi.cast("uint32_t*", ffi.from_buffer(arr))
         lib.dc_markseen_msgs(self._dc_context, msg_ids, len(messages))
 
+    def forward_messages(self, messages, chat):
+        """ Forward list of messages to a chat.
+
+        :param messages: list of :class:`Message` object.
+        :param chat: :class:`Chat` object.
+        :returns: None
+        """
+        msg_ids = [msg.id for msg in messages]
+        lib.dc_forward_msgs(self._dc_context, msg_ids, len(msg_ids), chat.id)
+
     def start(self):
         """ configure this account object, start receiving events,
         start IMAP/SMTP threads. """

python/tests/test_account.py

@@ -122,6 +122,35 @@ class TestOnlineAccount:
         assert ac1.get_config("mail_pw")
         assert ac1.is_configured()
 
+    def test_forward_messages(self, acfactory):
+        ac1 = acfactory.get_live_account()
+        ac2 = acfactory.get_live_account()
+        c2 = ac1.create_contact(email=ac2.get_config("addr"))
+        chat = ac1.create_chat_by_contact(c2)
+        assert chat.id >= lib.DC_CHAT_ID_LAST_SPECIAL
+
+        self.wait_successful_IMAP_SMTP_connection(ac1)
+        self.wait_successful_IMAP_SMTP_connection(ac2)
+        self.wait_configuration_progress(ac1, 1000)
+        self.wait_configuration_progress(ac2, 1000)
+        msg_out = chat.send_text_message("message2")
+
+        # wait for other account to receive
+        ev = ac2._evlogger.get_matching("DC_EVENT_MSGS_CHANGED")
+        assert ev[2] == msg_out.id
+        msg_in = ac2.get_message_by_id(msg_out.id)
+        assert msg_in.text == "message2"
+
+        # check the message arrived in contact-requests/deaddrop
+        chat2 = msg_in.chat
+        assert msg_in in chat2.get_messages()
+        assert chat2.is_deaddrop()
+        chat3 = ac2.create_group_chat("newgroup")
+        assert not chat3.is_promoted()
+        ac2.forward_messages([msg_in], chat3)
+        assert chat3.is_promoted()
+        assert chat3.get_messages()
+
     def test_send_and_receive_message(self, acfactory):
         ac1 = acfactory.get_live_account()
         ac2 = acfactory.get_live_account()