Fix v2_alpha registration. Add unit tests.

V2 Registration forced everyone (including ASes) to create a password for a
user, when ASes should be able to omit passwords. Also unbreak AS registration
in general which checked too early if the given username was claimed by an AS;
it was checked before knowing if the AS was the one doing the registration! Add
unit tests for AS reg, user reg and disabled_registration flag.

tests/rest/client/v2_alpha/test_register.py

@@ -0,0 +1,132 @@
+from synapse.rest.client.v2_alpha.register import RegisterRestServlet
+from synapse.api.errors import SynapseError
+from twisted.internet import defer
+from mock import Mock, MagicMock
+from tests import unittest
+import json
+
+
+class RegisterRestServletTestCase(unittest.TestCase):
+
+    def setUp(self):
+        # do the dance to hook up request data to self.request_data
+        self.request_data = ""
+        self.request = Mock(
+            content=Mock(read=Mock(side_effect=lambda: self.request_data)),
+        )
+        self.request.args = {}
+
+        self.appservice = None
+        self.auth = Mock(get_appservice_by_req=Mock(
+            side_effect=lambda x: defer.succeed(self.appservice))
+        )
+
+        self.auth_result = (False, None, None)
+        self.auth_handler = Mock(
+            check_auth=Mock(side_effect=lambda x,y,z: self.auth_result)
+        )
+        self.registration_handler = Mock()
+        self.identity_handler = Mock()
+        self.login_handler = Mock()
+
+        # do the dance to hook it up to the hs global
+        self.handlers = Mock(
+            auth_handler=self.auth_handler,
+            registration_handler=self.registration_handler,
+            identity_handler=self.identity_handler,
+            login_handler=self.login_handler
+        )
+        self.hs = Mock()
+        self.hs.hostname = "superbig~testing~thing.com"
+        self.hs.get_auth = Mock(return_value=self.auth)
+        self.hs.get_handlers = Mock(return_value=self.handlers)
+        self.hs.config.disable_registration = False
+
+        # init the thing we're testing
+        self.servlet = RegisterRestServlet(self.hs)
+
+    @defer.inlineCallbacks
+    def test_POST_appservice_registration_valid(self):
+        user_id = "@kermit:muppet"
+        token = "kermits_access_token"
+        self.request.args = {
+            "access_token": "i_am_an_app_service"
+        }
+        self.request_data = json.dumps({
+            "username": "kermit"
+        })
+        self.appservice = {
+            "id": "1234"
+        }
+        self.registration_handler.register = Mock(return_value=(user_id, token))
+        result = yield self.servlet.on_POST(self.request)
+        self.assertEquals(result, (200, {
+            "user_id": user_id,
+            "access_token": token,
+            "home_server": self.hs.hostname
+        }))
+
+    @defer.inlineCallbacks
+    def test_POST_appservice_registration_invalid(self):
+        self.request.args = {
+            "access_token": "i_am_an_app_service"
+        }
+        self.request_data = json.dumps({
+            "username": "kermit"
+        })
+        self.appservice = None  # no application service exists
+        result = yield self.servlet.on_POST(self.request)
+        self.assertEquals(result, (401, None))
+
+    def test_POST_bad_password(self):
+        self.request_data = json.dumps({
+            "username": "kermit",
+            "password": 666
+        })
+        d = self.servlet.on_POST(self.request)
+        return self.assertFailure(d, SynapseError)
+
+    def test_POST_bad_username(self):
+        self.request_data = json.dumps({
+            "username": 777,
+            "password": "monkey"
+        })
+        d = self.servlet.on_POST(self.request)
+        return self.assertFailure(d, SynapseError)
+
+    @defer.inlineCallbacks
+    def test_POST_user_valid(self):
+        user_id = "@kermit:muppet"
+        token = "kermits_access_token"
+        self.request_data = json.dumps({
+            "username": "kermit",
+            "password": "monkey"
+        })
+        self.registration_handler.check_username = Mock(return_value=True)
+        self.auth_result = (True, None, {
+            "username": "kermit",
+            "password": "monkey"
+        })
+        self.registration_handler.register = Mock(return_value=(user_id, token))
+
+        result = yield self.servlet.on_POST(self.request)
+        self.assertEquals(result, (200, {
+            "user_id": user_id,
+            "access_token": token,
+            "home_server": self.hs.hostname
+        }))
+
+    def test_POST_disabled_registration(self):
+        self.hs.config.disable_registration = True
+        self.request_data = json.dumps({
+            "username": "kermit",
+            "password": "monkey"
+        })
+        self.registration_handler.check_username = Mock(return_value=True)
+        self.auth_result = (True, None, {
+            "username": "kermit",
+            "password": "monkey"
+        })
+        self.registration_handler.register = Mock(return_value=("@user:id", "t"))
+        d = self.servlet.on_POST(self.request)
+        return self.assertFailure(d, SynapseError)