change the Python API to follow the engine API after ENGINE-959

The decrypt method of the message class now returns a tuple of three elements
instead of four:
* message
* keys
* flags
There is no more rating among the results, as the rating is now a property of
the message -- and can be easily accessed as message.rating .

Update examples and tests.

examples/simple_xml_msgformat.py

@@ -127,5 +127,5 @@ def parse_serialized_message(transport_message):
                     pEp_attachs.append(
                         pEp.Blob(attach.text.encode(), TAG2CT[tagname]))
             msg1.attachments = pEp_attachs
-    msg2, keys, rating, flags = msg1.decrypt()
-    return msg2, rating
+    msg2, keys, flags = msg1.decrypt()
+    return msg2, msg2.rating

src/pEp/_pEp/message_api.cc

@@ -62,7 +62,7 @@ namespace pEp {
 
             Message dst = _dst ? Message(_dst) : Message(src);
             PEP_rating _rating = dst.rating ();
-            return boost::python::make_tuple(dst, keylist, _rating, _flags);
+            return boost::python::make_tuple(dst, keylist, _flags);
         }
 
         PEP_color _color(int rating) {

src/pEp/_pEp/pEpmodule.cc

@@ -514,7 +514,6 @@ namespace pEp {
                 "\n"
                 "   msg             the decrypted p≡p message\n"
                 "   keys            a list of keys being used\n"
-                "   rating          the rating of the message as integer\n"
                 "   flags           flags set while decryption\n"
                 )
                 .add_property("outgoing_rating", &Message::outgoing_rating, "rating outgoing message will have")

test/codec_doctest.py

@@ -4,7 +4,7 @@
 """
 >>> import pEp
 >>> def message_to_send(msg):
-...   m, keys, rating, flags = msg.decrypt()
+...   m, keys, flags = msg.decrypt()
 ...   try:
 ...     m.attachments[0].decode()
 ...     print("decode successfull")

test/pyadpt-81.py

@@ -6,7 +6,7 @@ import time
 
 def message_to_send(msg):
     print("User defined message_to_send() called")
-    m, keys, rating, flags = msg.decrypt()
+    m, keys, flags = msg.decrypt()
     try:
         print(m.attachments[0].decode())
     except UnicodeDecodeError as e:

test/sync_handshake.py

@@ -103,7 +103,7 @@ def messageImapToSend(msg):
 
 def add_debug_info(msg):
     if msg.enc_format:
-        m, keys, rating, flags = msg.decrypt(DONT_TRIGGER_SYNC)
+        m, keys, flags = msg.decrypt(DONT_TRIGGER_SYNC)
     else:
         m = msg
     try:    
@@ -212,7 +212,7 @@ def run(name, color=None, imap=False, own_ident=1, leave=False):
                 msg = pEp.Message(m)
                 output("*** Reading")
                 print_msg(msg)
-                msg2, keys, rating, flags = msg.decrypt()
+                msg2, keys, flags = msg.decrypt()
 
     except KeyboardInterrupt:
         shutdown_sync()

tests/test_basic.py

@@ -20,8 +20,8 @@ import pytest
 # >>> m.longmsg = "Please call me back"
 # >>> m2 = m.encrypt()
 # >>> print(m2)
-# >>> m3, keys, rating, flags = m2.decrypt()
-# >>> rating
+# >>> m3, keys, flags = m2.decrypt()
+# >>> m3.rating
 # pEp.rating.reliable
 # """
 #
@@ -50,6 +50,6 @@ def test_basic(pEp, model):
     m.longmsg = constants.BODY
     #TODO: encrypt needs to return message type
     m2 = m.encrypt()
-    m3, keys, rating, flags = m2.decrypt()
+    m3, keys, flags = m2.decrypt()
     #TODO: fix pEp.rating
-    # assert rating == pEp.
+    # assert m3.rating == pEp.

tests/test_message.py

@@ -35,13 +35,13 @@ def test_msg_enc_dec_roundtrip(pEp, model, import_ident_alice_as_own_ident, impo
     assert enc_msg.longmsg == "this message was encrypted with p≡p https://pEp-project.org"
 
     # Decrypt message.
-    dec_msg, key_list, rating, r = enc_msg.decrypt()
+    dec_msg, key_list, r = enc_msg.decrypt()
     assert r == 0
     # pEp version 2.2 throws this error:
     # AttributeError: module 'pEp' has no attribute 'PEP_rating'
-    # assert rating == pEp.PEP_rating.PEP_rating_reliable
+    # assert dec_msg.rating == pEp.PEP_rating.PEP_rating_reliable
     # It seems to have changed to the following.
-    assert rating == pEp._pEp.rating.reliable
+    assert dec_msg.rating == pEp._pEp.rating.reliable
 
     # The first 2 keys are Alice's ones, the last is Bob's one.
     assert key_list[0] == key_list[1] == model.alice.fpr
@@ -123,7 +123,7 @@ def test_dec_msg_len(pEp, import_ident_alice_as_own_ident, import_ident_bob):
     enc_msg = msg.encrypt()
 
     # Decrypt message.
-    dec_msg, _key_list, _rating, _r = enc_msg.decrypt()
+    dec_msg, _key_list, _r = enc_msg.decrypt()
     dec_msg_len = len(str(dec_msg))
 
     assert dec_msg.longmsg.replace("\r", "") == constants.BODY  # msg.longmsg

utils/pEp

@@ -77,7 +77,7 @@ try:
                 dst = src.encrypt()
             else:
                 src.dir = 0
-                dst, keys, rating, flags = src.decrypt()
+                dst, keys, flags = src.decrypt()
 
             print(str(dst))