[PATCH] login: preserve GET arguments throughout login redirection (issue #104)

[Thomas De Schampheleire]

# HG changeset patch
# User Thomas De Schampheleire <thomas.de.schampheleire at gmail.com>
# Date 1432065035 -7200
#      Tue May 19 21:50:35 2015 +0200
# Node ID cedc3ee5ef792a77a515997c90b38099f4688166
# Parent  579110ca5178f13254e7e4c7b6043767a11b92a2
login: preserve GET arguments throughout login redirection (issue #104)

When redirecting a user to the login page and while handling this login and
redirecting to the original page, the GET arguments passed to the original
URL are lost through the login redirection process.

For example, when creating a pull request for a specific revision from the
repository changelog, there are rev_start and rev_end arguments passed in
the URL. Through the login redirection, they are lost.

Fix the issue by passing along the GET arguments to the login page, in the
login form action, and when redirecting back to the original page.
Tests are added to cover these cases.

diff --git a/kallithea/controllers/login.py b/kallithea/controllers/login.py
--- a/kallithea/controllers/login.py
+++ b/kallithea/controllers/login.py
@@ -100,7 +100,12 @@ class LoginController(BaseController):
             log.error('Suspicious NETLOC detected %s for url %s server url '
                       'is: %s' % (parsed.netloc, parsed, server_parsed))
             came_from = url('home')
-        return came_from
+        return came_from.encode('ascii')
+
+    def _redirect_to_origin(self, origin, headers=None):
+        '''redirect to the original page, preserving any get arguments given'''
+        request.GET.pop('came_from', None)
+        raise HTTPFound(location=url(origin, **request.GET), headers=headers)
 
     def index(self):
         _default_came_from = url('home')
@@ -112,7 +117,7 @@ class LoginController(BaseController):
 
         # redirect if already logged in
         if self.authuser.is_authenticated and not_default and ip_allowed:
-            raise HTTPFound(location=c.came_from)
+            return self._redirect_to_origin(c.came_from)
 
         if request.POST:
             # import Login Form validator class
@@ -124,7 +129,8 @@ class LoginController(BaseController):
                 headers = self._store_user_in_session(
                                         username=c.form_result['username'],
                                         remember=c.form_result['remember'])
-                raise HTTPFound(location=c.came_from, headers=headers)
+                return self._redirect_to_origin(c.came_from, headers)
+
             except formencode.Invalid, errors:
                 defaults = errors.value
                 # remove password from filling in form again
@@ -157,7 +163,8 @@ class LoginController(BaseController):
 
             if auth_info:
                 headers = self._store_user_in_session(auth_info.get('username'))
-                raise HTTPFound(location=c.came_from, headers=headers)
+                return self._redirect_to_origin(c.came_from, headers)
+
         return render('/login.html')
 
     @HasPermissionAnyDecorator('hg.admin', 'hg.register.auto_activate',
diff --git a/kallithea/lib/auth.py b/kallithea/lib/auth.py
--- a/kallithea/lib/auth.py
+++ b/kallithea/lib/auth.py
@@ -711,7 +711,7 @@ def redirect_to_login(message=None):
     if message:
         h.flash(h.literal(message), category='warning')
     log.debug('Redirecting to login page, origin: %s' % p)
-    return redirect(url('login_home', came_from=p))
+    return redirect(url('login_home', came_from=p, **request.GET))
 
 class LoginRequired(object):
     """
diff --git a/kallithea/templates/login.html b/kallithea/templates/login.html
--- a/kallithea/templates/login.html
+++ b/kallithea/templates/login.html
@@ -16,7 +16,7 @@
         %endif
     </div>
     <div class="panel-body inner">
-        ${h.form(h.url.current(came_from=c.came_from))}
+        ${h.form(h.url.current(**request.GET))}
         <div class="form">
             <i class="icon-lock"></i>
             <!-- fields -->
diff --git a/kallithea/tests/functional/test_login.py b/kallithea/tests/functional/test_login.py
--- a/kallithea/tests/functional/test_login.py
+++ b/kallithea/tests/functional/test_login.py
@@ -96,6 +96,42 @@ class TestLoginController(TestController
         response.mustcontain('invalid user name')
         response.mustcontain('invalid password')
 
+    # verify that get arguments are correctly passed along login redirection
+
+    def test_redirection_to_login_form_preserves_get_args(self):
+        with fixture.anon_access(False):
+            response = self.app.get(url(controller='summary', action='index',
+                                        repo_name=HG_REPO,
+                                        foo='one', bar='two'))
+            self.assertEqual(response.status, '302 Found')
+            self.assertIn('foo=one&bar=two', response.location)
+
+    def test_login_form_preserves_get_args(self):
+        response = self.app.get(url(controller='login', action='index',
+                                    came_from = '/_admin/users',
+                                    foo='one', bar='two'))
+        self.assertIn('foo=one&bar=two', response.form.action)
+
+    def test_redirection_after_successful_login_preserves_get_args(self):
+        response = self.app.post(url(controller='login', action='index',
+                                     came_from = '/_admin/users',
+                                     foo='one', bar='two'),
+                                 {'username': 'test_admin',
+                                  'password': 'test12'})
+        self.assertEqual(response.status, '302 Found')
+        self.assertIn('foo=one&bar=two', response.location)
+
+    def test_login_form_after_incorrect_login_preserves_get_args(self):
+        response = self.app.post(url(controller='login', action='index',
+                                     came_from = '/_admin/users',
+                                     foo='one', bar='two'),
+                                 {'username': 'error',
+                                  'password': 'test12'})
+
+        response.mustcontain('invalid user name')
+        response.mustcontain('invalid password')
+        self.assertIn('foo=one&bar=two', response.form.action)
+
     #==========================================================================
     # REGISTRATIONS
     #==========================================================================