[WIP] Used a plain HTML form for DjangoProject login

Fixes django#95, django#61 and django#60
Also possibly django#100 and django#64

DjangoPlugin/tracdjangoplugin/__init__.py

@@ -1,6 +1,7 @@
 from trac.core import Component, implements
 from trac.web.chrome import INavigationContributor
-from trac.web.api import IRequestFilter, IRequestHandler
+from trac.web.api import IRequestFilter, IRequestHandler, RequestDone
+from trac.web.auth import LoginModule
 from trac.wiki.web_ui import WikiModule
 from trac.util import Markup
 from trac.util.html import tag
@@ -91,3 +92,41 @@ def _format_changeset_link(self, formatter, ns, chgset, label, fullmatch=None):
         return super(GitHubBrowserWithSVNChangesets, self)._format_changeset_link(
             formatter, ns, chgset, label, fullmatch
         )
+
+
+class PlainLoginComponent(Component):
+    """
+    Enable login through a plain HTML form (no more HTTP basic auth)
+    """
+    implements(IRequestHandler)
+
+    def match_request(self, req):
+        return req.path_info == '/login'
+
+    def process_request(self, req):
+        if req.method == 'POST':
+            return self.do_post(req)
+        elif req.method == 'GET':
+            return self.do_get(req)
+        else:
+            req.send_response(405)
+            raise RequestDone
+
+    def do_get(self, req):
+        # XXX: Importing at the toplevel causes an AppRegistryNotReady as of now
+        # Probably because we're inside __init__ so when gunicorn tries to import wsgi.py it's
+        # also loading this module which triggers the error
+        from django.contrib.auth.forms import AuthenticationForm
+        return 'plainlogin.html', {'form': AuthenticationForm(), 'next': req.args.get('next', '/')}
+
+    def do_post(self, req):
+        from django.contrib.auth.forms import AuthenticationForm
+        form = AuthenticationForm(data=req.args)
+        if form.is_valid():
+            req.environ["REMOTE_USER"] = form.get_user().username
+            LoginModule(self.compmgr)._do_login(req)
+            redirect_url = req.args.get('next', '/')
+            # TODO: validate that the redirect URL is safe to redirect to (same domain at least)
+            # maybe using django.utils.http.is_safe_url()?
+            req.redirect(redirect_url)
+        return 'plainlogin.html', {'form': form, 'next': req.args.get('next', '/')}

DjangoPlugin/tracdjangoplugin/settings.py

@@ -24,5 +24,3 @@
 
 
 SECRET_KEY = str(SECRETS["secret_key"])
-
-BASIC_AUTH_REALM = "Django's Trac"

DjangoPlugin/tracdjangoplugin/wsgi.py

@@ -1,21 +1,17 @@
 import os
 
 import trac.web.main
-
 application = trac.web.main.dispatch_request
 
+import django
+django.setup()
+
 # Massive hack to make Trac fast, otherwise every git call tries to close ulimit -n (1e6) fds
 # Python 3 would perform better here, but we are still on 2.7 for Trac, so leak fds for now.
 from tracopt.versioncontrol.git import PyGIT
-
 PyGIT.close_fds = False
 
-from .djangoauth import DjangoAuth
-
-application = DjangoAuth(application)
-
 trac_dsn = os.getenv("SENTRY_DSN")
-
 if trac_dsn:
     import sentry_sdk
     from sentry_sdk.integrations.wsgi import SentryWsgiMiddleware

trac-env/conf/trac.ini

@@ -22,6 +22,7 @@ trac.ticket.roadmap.roadmapmodule = disabled
 trac.versioncontrol.web_ui.browser.browsermodule = disabled
 trac.versioncontrol.web_ui.changeset.changesetmodule = disabled
 trac.versioncontrol.web_ui.log.logmodule = disabled
+trac.web.auth.loginmodule = disabled; replaced by djangoplugin.PlainLoginComponent
 trac.wiki.web_ui.wikimodule = disabled
 tracdjangoplugin.* = enabled
 tracext.github.githubloginmodule = enabled

trac-env/templates/django_theme.html

@@ -28,8 +28,7 @@
           </form>
         </li>
       # else
-        <li><a href="/github/login">GitHub Login</a></li>
-        <li><a href="/login">DjangoProject Login</a></li>
+        <li><a href="/login">Login</a></li>
       # endif
       <li><a href="${req.href.prefs()}">Preferences</a></li>
       # if req.perm.has_permission('XML_RPC'):

trac-env/templates/plainlogin.html

@@ -0,0 +1,36 @@
+# extends 'layout.html'
+
+# block title
+  Login ${ super() }
+# endblock title
+
+# block content
+<h1>Choose how you want to log in</h1>
+
+<section class="login-github">
+  <h2>Log in with you GitHub account</h2>
+  <a href="/github/login">Log in with GitHub</a>
+<section>
+
+<section class="login-djangoproject">
+  <h2>Log in with your DjangoProject account</h2>
+  <form action="" method="post" class="plainlogin">
+    ${form.as_p()}
+    <p>
+      <button type="submit">Log in with DjangoProject</button>
+      <input type="hidden" name="__FORM_TOKEN" value="${req.form_token}">{# Trac's CSRF protection #}
+      <input type="hidden" name="next" value="${next|default('/')}">
+    </p>
+  </form>
+</section>
+
+<section class="login-managing">
+  <h2>Account management</h2>
+  <nav>
+    <ul>
+      <li><a href="https://www.djangoproject.com/accounts/register/">Create a new DjangoProject account</a></li>
+      <li><a href="https://www.djangoproject.com/accounts/password_reset/">Reset your password</a></li>
+    </ul>
+  </nav>
+</section>
+# endblock content