From d4d19211375de71a1c411ae01a16d451ce5917b9 Mon Sep 17 00:00:00 2001
From: Evgeny Fadeev <evgeny.fadeev@gmail.com>
Date: Sun, 15 Jun 2014 04:50:44 -0300
Subject: added validation to custom logo destination url

---
 askbot/conf/skin_general_settings.py | 22 ++++++++++++++++++++--
 askbot/doc/source/changelog.rst      |  1 +
 askbot/doc/source/contributors.rst   |  1 +
 askbot/templates/widgets/logo.html   |  6 ++++--
 4 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/askbot/conf/skin_general_settings.py b/askbot/conf/skin_general_settings.py
index 2a4c76fa..beaf04be 100644
--- a/askbot/conf/skin_general_settings.py
+++ b/askbot/conf/skin_general_settings.py
@@ -6,6 +6,8 @@ from askbot.deps.livesettings import ConfigurationGroup
 from askbot.deps.livesettings import values
 from django.utils.translation import ugettext_lazy as _
 from django.conf import settings as django_settings
+from django.core.validators import URLValidator
+from django.core.exceptions import ValidationError
 from askbot.skins import utils as skin_utils
 from askbot import const
 from askbot.conf.super_groups import CONTENT_AND_UI
@@ -16,12 +18,28 @@ GENERAL_SKIN_SETTINGS = ConfigurationGroup(
                     super_group = CONTENT_AND_UI
                 )
 
+def logo_destination_callback(old_url, new_url):
+    url = new_url.strip()
+    if url == '':
+        return ''
+
+    if url.startswith('/'):
+        return url
+
+    validate = URLValidator()
+    try:
+        validate(url)
+        return url
+    except ValidationError:
+        raise ValueError(_('Please enter a valid url'))
+
 settings.register(
     values.StringValue(
         GENERAL_SKIN_SETTINGS,
         'LOGO_DESTINATION_URL',
-        default = '/',
-        description = _('Destination URL for the site logo'),
+        default = '',
+        description = _('Custom destination URL for the logo'),
+        update_callback=logo_destination_callback
     )
 )
 
diff --git a/askbot/doc/source/changelog.rst b/askbot/doc/source/changelog.rst
index e554e324..67928fbc 100644
--- a/askbot/doc/source/changelog.rst
+++ b/askbot/doc/source/changelog.rst
@@ -3,6 +3,7 @@ Changes in Askbot
 
 Development master branch (only on github)
 ------------------------------------------
+* Allow custom destination url under the logo
 * Option to allow asking without registration (Egil Moeller)
 * Implemented Mozilla Persona authentication
 * Allowed custom providers of gravatar service (michas2)
diff --git a/askbot/doc/source/contributors.rst b/askbot/doc/source/contributors.rst
index 2ebcaebb..d1e2dd3a 100644
--- a/askbot/doc/source/contributors.rst
+++ b/askbot/doc/source/contributors.rst
@@ -58,6 +58,7 @@ Programming, bug fixes and documentation
 * `Francis Devereux <https://github.com/frankoid>`_
 * `Andrew Chen <https://github.com/yongjhih>`_
 * `Egil Moeller <https://github.com/redhog>`_
+* `Jerry Zhenlei Cai <https://github.com/jerryzhenleicai>`_
 
 Translations
 ------------
diff --git a/askbot/templates/widgets/logo.html b/askbot/templates/widgets/logo.html
index afa0a95b..c0349d1f 100644
--- a/askbot/templates/widgets/logo.html
+++ b/askbot/templates/widgets/logo.html
@@ -1,5 +1,7 @@
-<a id="logo" href="{%if settings.LOGO_DESTINATION_URL%}{{ settings.LOGO_DESTINATION_URL}}{% else %} {% url questions %}{% endif %}"><img
+<a 
+    id="logo" 
+    href="{% if settings.LOGO_DESTINATION_URL %}{{ settings.LOGO_DESTINATION_URL }}{% else %}{% url questions %}{% endif %}"
+><img
     src="{{ settings.SITE_LOGO_URL|media }}"
-    title="{% trans %}back to home page{% endtrans %}"
     alt="{% trans site=settings.APP_SHORT_NAME %}{{site}} logo{% endtrans %}"/>
 </a>
-- 
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