Avoids informing browser whether the username or email is a match

- pretends to have sent the email with the URL to change the password
  regardless of whether or not the email was actually sent. This
  avoids leaking user information to the browser

mediagoblin/auth/views.py

@@ -204,10 +204,7 @@ def forgot_password(request):
                {'$or': [{'username': request.POST['username']},
                {'email': request.POST['username']}]})
 
-        if not user:
-            fp_form.username.errors.append(
-                u"Sorry, the username doesn't exists")
-        else:
+        if user:
             user['fp_verification_key'] = unicode(uuid.uuid4())
             user['fp_token_expire'] = datetime.datetime.now() + \
                                       datetime.timedelta(days=10)
@@ -215,7 +212,8 @@ def forgot_password(request):
 
             send_fp_verification_email(user, request)
 
-            return redirect(request, 'mediagoblin.auth.fp_email_sent')
+        # do not reveal whether or not there is a matching user, just move along
+        return redirect(request, 'mediagoblin.auth.fp_email_sent')
 
     return render_to_response(
     request,