Extract out stream() method

ssb/feed.py

@@ -67,6 +67,9 @@ class Message(object):
         msg = cls(feed, obj['content'], timestamp=obj['timestamp'])
         return msg, obj['signature']
 
+    def serialize(self, add_signature=True):
+        return dumps(self.to_dict(add_signature=add_signature), indent=2).encode('utf-8')
+
     def to_dict(self, add_signature=True):
         obj = to_ordered({
             'previous': self.previous.key if self.previous else None,
@@ -86,7 +89,7 @@ class Message(object):
 
     @property
     def hash(self):
-        hash = sha256(dumps(self.to_dict(), indent=2).encode('ascii')).digest()
+        hash = sha256(self.serialize()).digest()
         return b64encode(hash).decode('ascii') + '.sha256'
 
     @property
@@ -114,5 +117,5 @@ class LocalMessage(Message):
 
     def _sign(self):
         # ensure ordering of keys and indentation of 2 characters, like ssb-keys
-        data = dumps(self.to_dict(add_signature=False), indent=2)
-        return (b64encode(bytes(self.feed.sign(data.encode('ascii')))) + b'.sig.ed25519').decode('ascii')
+        data = self.serialize(add_signature=False)
+        return (b64encode(bytes(self.feed.sign(data))) + b'.sig.ed25519').decode('ascii')

ssb/tests/test_feed.py

@@ -4,7 +4,7 @@ from collections import OrderedDict
 import pytest
 from nacl.signing import SigningKey, VerifyKey
 
-from ssb.feed import LocalMessage, LocalFeed, Feed, Message, NoPrivateKeyException
+from ssb.feed import LocalMessage, LocalFeed, Feed, Message
 
 
 @pytest.fixture()
@@ -99,3 +99,27 @@ def test_remote_no_signature(remote_feed):
             ('name', 'neo'),
             ('description', 'The Chosen One')
         ]), None, timestamp=1495706260190)
+
+
+def test_serialize(local_feed):
+    m1 = LocalMessage(local_feed, OrderedDict([
+        ('type', 'about'),
+        ('about', local_feed.id),
+        ('name', 'neo'),
+        ('description', 'The Chosen One')
+    ]), timestamp=1495706260190)
+
+    assert m1.serialize() == b"""{
+  "previous": null,
+  "author": "@I/4cyN/jPBbDsikbHzAEvmaYlaJK33lW3UhWjNXjyrU=.ed25519",
+  "sequence": 1,
+  "timestamp": 1495706260190,
+  "hash": "sha256",
+  "content": {
+    "type": "about",
+    "about": "@I/4cyN/jPBbDsikbHzAEvmaYlaJK33lW3UhWjNXjyrU=.ed25519",
+    "name": "neo",
+    "description": "The Chosen One"
+  },
+  "signature": "lPsQ9P10OgeyH6u0unFgiI2wV/RQ7Q2x2ebxnXYCzsJ055TBMXphRADTKhOMS2EkUxXQ9k3amj5fnWPudGxwBQ==.sig.ed25519"
+}"""