Simplify LoginHander and AuthHandler

 * Merge LoginHandler -> AuthHandler
 * Add a bunch of documentation
 * Improve some naming
 * Remove unused branches

I will start merging the actual logic of the two handlers shortly

4 files changed, 77 insertions, 108 deletions

diff --git a/synapse/handlers/__init__.py b/synapse/handlers/__init__.py
index dc5b6ef79d..8725c3c420 100644
--- a/synapse/handlers/__init__.py
+++ b/synapse/handlers/__init__.py
@@ -22,7 +22,6 @@ from .room import (
 from .message import MessageHandler
 from .events import EventStreamHandler, EventHandler
 from .federation import FederationHandler
-from .login import LoginHandler
 from .profile import ProfileHandler
 from .presence import PresenceHandler
 from .directory import DirectoryHandler
@@ -54,7 +53,6 @@ class Handlers(object):
         self.profile_handler = ProfileHandler(hs)
         self.presence_handler = PresenceHandler(hs)
         self.room_list_handler = RoomListHandler(hs)
-        self.login_handler = LoginHandler(hs)
         self.directory_handler = DirectoryHandler(hs)
         self.typing_notification_handler = TypingNotificationHandler(hs)
         self.admin_handler = AdminHandler(hs)
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 1ecf7fef17..1504b00d7e 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -47,17 +47,24 @@ class AuthHandler(BaseHandler):
         self.sessions = {}
 
     @defer.inlineCallbacks
-    def check_auth(self, flows, clientdict, clientip=None):
+    def check_auth(self, flows, clientdict, clientip):
         """
         Takes a dictionary sent by the client in the login / registration
         protocol and handles the login flow.
 
+        As a side effect, this function fills in the 'creds' key on the user's
+        session with a map, which maps each auth-type (str) to the relevant
+        identity authenticated by that auth-type (mostly str, but for captcha, bool).
+
         Args:
-            flows: list of list of stages
-            authdict: The dictionary from the client root level, not the
-                      'auth' key: this method prompts for auth if none is sent.
+            flows (list): A list of login flows. Each flow is an ordered list of
+                          strings representing auth-types. At least one full
+                          flow must be completed in order for auth to be successful.
+            clientdict: The dictionary from the client root level, not the
+                        'auth' key: this method prompts for auth if none is sent.
+            clientip (str): The IP address of the client.
         Returns:
-            A tuple of authed, dict, dict where authed is true if the client
+            A tuple of (authed, dict, dict) where authed is true if the client
             has successfully completed an auth flow. If it is true, the first
             dict contains the authenticated credentials of each stage.
 
@@ -75,7 +82,7 @@ class AuthHandler(BaseHandler):
             del clientdict['auth']
             if 'session' in authdict:
                 sid = authdict['session']
-        sess = self._get_session_info(sid)
+        session = self._get_session_info(sid)
 
         if len(clientdict) > 0:
             # This was designed to allow the client to omit the parameters
@@ -87,20 +94,19 @@ class AuthHandler(BaseHandler):
             # on a home server.
             # Revisit: Assumimg the REST APIs do sensible validation, the data
             # isn't arbintrary.
-            sess['clientdict'] = clientdict
-            self._save_session(sess)
-            pass
-        elif 'clientdict' in sess:
-            clientdict = sess['clientdict']
+            session['clientdict'] = clientdict
+            self._save_session(session)
+        elif 'clientdict' in session:
+            clientdict = session['clientdict']
 
         if not authdict:
             defer.returnValue(
-                (False, self._auth_dict_for_flows(flows, sess), clientdict)
+                (False, self._auth_dict_for_flows(flows, session), clientdict)
             )
 
-        if 'creds' not in sess:
-            sess['creds'] = {}
-        creds = sess['creds']
+        if 'creds' not in session:
+            session['creds'] = {}
+        creds = session['creds']
 
         # check auth type currently being presented
         if 'type' in authdict:
@@ -109,15 +115,15 @@ class AuthHandler(BaseHandler):
             result = yield self.checkers[authdict['type']](authdict, clientip)
             if result:
                 creds[authdict['type']] = result
-                self._save_session(sess)
+                self._save_session(session)
 
         for f in flows:
             if len(set(f) - set(creds.keys())) == 0:
                 logger.info("Auth completed with creds: %r", creds)
-                self._remove_session(sess)
+                self._remove_session(session)
                 defer.returnValue((True, creds, clientdict))
 
-        ret = self._auth_dict_for_flows(flows, sess)
+        ret = self._auth_dict_for_flows(flows, session)
         ret['completed'] = creds.keys()
         defer.returnValue((False, ret, clientdict))
 
@@ -270,6 +276,54 @@ class AuthHandler(BaseHandler):
 
         return self.sessions[session_id]
 
+    @defer.inlineCallbacks
+    def login_with_password(self, user_id, password):
+        """
+        Authenticates the user with their username and password.
+
+        Used only by the v1 login API.
+
+        Args:
+            user_id (str): User ID
+            password (str): Password
+        Returns:
+            The access token for the user's session.
+        Raises:
+            StoreError if there was a problem storing the token.
+            LoginError if there was an authentication problem.
+        """
+        user_info = yield self.store.get_user_by_id(user_id=user_id)
+        if not user_info:
+            logger.warn("Attempted to login as %s but they do not exist", user_id)
+            raise LoginError(403, "", errcode=Codes.FORBIDDEN)
+
+        stored_hash = user_info["password_hash"]
+        if not bcrypt.checkpw(password, stored_hash):
+            logger.warn("Failed password login for user %s", user_id)
+            raise LoginError(403, "", errcode=Codes.FORBIDDEN)
+
+        reg_handler = self.hs.get_handlers().registration_handler
+        access_token = reg_handler.generate_token(user_id)
+        logger.info("Adding token %s for user %s", access_token, user_id)
+        yield self.store.add_access_token_to_user(user_id, access_token)
+        defer.returnValue(access_token)
+
+    @defer.inlineCallbacks
+    def set_password(self, user_id, newpassword):
+        password_hash = bcrypt.hashpw(newpassword, bcrypt.gensalt())
+
+        yield self.store.user_set_password_hash(user_id, password_hash)
+        yield self.store.user_delete_access_tokens(user_id)
+        yield self.hs.get_pusherpool().remove_pushers_by_user(user_id)
+        yield self.store.flush_user(user_id)
+
+    @defer.inlineCallbacks
+    def add_threepid(self, user_id, medium, address, validated_at):
+        yield self.store.user_add_threepid(
+            user_id, medium, address, validated_at,
+            self.hs.get_clock().time_msec()
+        )
+
     def _save_session(self, session):
         # TODO: Persistent storage
         logger.debug("Saving session %s", session)
diff --git a/synapse/handlers/login.py b/synapse/handlers/login.py
deleted file mode 100644
index 91d87d503d..0000000000
--- a/synapse/handlers/login.py
+++ /dev/null
@@ -1,83 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright 2014, 2015 OpenMarket Ltd
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from twisted.internet import defer
-
-from ._base import BaseHandler
-from synapse.api.errors import LoginError, Codes
-
-import bcrypt
-import logging
-
-logger = logging.getLogger(__name__)
-
-
-class LoginHandler(BaseHandler):
-
-    def __init__(self, hs):
-        super(LoginHandler, self).__init__(hs)
-        self.hs = hs
-
-    @defer.inlineCallbacks
-    def login(self, user, password):
-        """Login as the specified user with the specified password.
-
-        Args:
-            user (str): The user ID.
-            password (str): The password.
-        Returns:
-            The newly allocated access token.
-        Raises:
-            StoreError if there was a problem storing the token.
-            LoginError if there was an authentication problem.
-        """
-        # TODO do this better, it can't go in __init__ else it cyclic loops
-        if not hasattr(self, "reg_handler"):
-            self.reg_handler = self.hs.get_handlers().registration_handler
-
-        # pull out the hash for this user if they exist
-        user_info = yield self.store.get_user_by_id(user_id=user)
-        if not user_info:
-            logger.warn("Attempted to login as %s but they do not exist", user)
-            raise LoginError(403, "", errcode=Codes.FORBIDDEN)
-
-        stored_hash = user_info["password_hash"]
-        if bcrypt.checkpw(password, stored_hash):
-            # generate an access token and store it.
-            token = self.reg_handler._generate_token(user)
-            logger.info("Adding token %s for user %s", token, user)
-            yield self.store.add_access_token_to_user(user, token)
-            defer.returnValue(token)
-        else:
-            logger.warn("Failed password login for user %s", user)
-            raise LoginError(403, "", errcode=Codes.FORBIDDEN)
-
-    @defer.inlineCallbacks
-    def set_password(self, user_id, newpassword, token_id=None):
-        password_hash = bcrypt.hashpw(newpassword, bcrypt.gensalt())
-
-        yield self.store.user_set_password_hash(user_id, password_hash)
-        yield self.store.user_delete_access_tokens_apart_from(user_id, token_id)
-        yield self.hs.get_pusherpool().remove_pushers_by_user_access_token(
-            user_id, token_id
-        )
-        yield self.store.flush_user(user_id)
-
-    @defer.inlineCallbacks
-    def add_threepid(self, user_id, medium, address, validated_at):
-        yield self.store.user_add_threepid(
-            user_id, medium, address, validated_at,
-            self.hs.get_clock().time_msec()
-        )
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index f81d75017d..39392d9fdd 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -91,7 +91,7 @@ class RegistrationHandler(BaseHandler):
             user = UserID(localpart, self.hs.hostname)
             user_id = user.to_string()
 
-            token = self._generate_token(user_id)
+            token = self.generate_token(user_id)
             yield self.store.register(
                 user_id=user_id,
                 token=token,
@@ -111,7 +111,7 @@ class RegistrationHandler(BaseHandler):
                     user_id = user.to_string()
                     yield self.check_user_id_is_valid(user_id)
 
-                    token = self._generate_token(user_id)
+                    token = self.generate_token(user_id)
                     yield self.store.register(
                         user_id=user_id,
                         token=token,
@@ -161,7 +161,7 @@ class RegistrationHandler(BaseHandler):
                 400, "Invalid user localpart for this application service.",
                 errcode=Codes.EXCLUSIVE
             )
-        token = self._generate_token(user_id)
+        token = self.generate_token(user_id)
         yield self.store.register(
             user_id=user_id,
             token=token,
@@ -208,7 +208,7 @@ class RegistrationHandler(BaseHandler):
         user_id = user.to_string()
 
         yield self.check_user_id_is_valid(user_id)
-        token = self._generate_token(user_id)
+        token = self.generate_token(user_id)
         try:
             yield self.store.register(
                 user_id=user_id,
@@ -273,7 +273,7 @@ class RegistrationHandler(BaseHandler):
                     errcode=Codes.EXCLUSIVE
                 )
 
-    def _generate_token(self, user_id):
+    def generate_token(self, user_id):
         # urlsafe variant uses _ and - so use . as the separator and replace
         # all =s with .s so http clients don't quote =s when it is used as
         # query params.