collective.scriptedredirect 1.1

Write redirects in Python for Plone CMS

.. contents::

Introduction
--------------

``collective.scriptedredirect`` allows you to write HTTP 302 Moved Temporary and HTTP 301 Moved Permanently
redirects for your `Plone CMS <http://plone.org>`_ site in Python code.

.. image:: https://travis-ci.org/collective/collective.scriptedredirect.png

Benefits
---------

* The redirect logic is front-end web server independent: no need to touch variouos configuration files of Apache, Varnish or Nginx)

* Python allows to write more complex logic for redirects easier - no regular expressions!

* Python scripts in Plone have access to more complete state information:
user logged in status, permissions, etc.

Usage
-----

Installation
++++++++++++++++

Add add-on in *buildout.cfg*::

eggs =
...
collective.scriptedredirect

Run buildout.

Install *Scripted redirects in Python* in Site Setup > Add-ons.

Doing redirects through the web
++++++++++++++++++++++++++++++++++++

Edit *redirect_handler* in Zope Management Interface in your site root.

.. image :: http://cloud.github.com/downloads/collective/collective.scriptedredirect/Screen%20Shot%202012-09-25%20at%201.28.18%20AM.png

In the case of accident use ``?no_redirect`` HTTP query parameter to override
the redirecter and fix your site.


Doing redirects through the web
++++++++++++++++++++++++++++++++++++

You can also register a browser view called ``redirect_handler``.
In this case, you write the redirect code in addon Python code
and not through the web.

``redirect_handler`` view is always preferred over ``redirect_handler`` script.

Example Python code in ``redirector.py``::

class TestingRedirectHandler(object):
""" Redirect handler registered as a ``redirect_handler`` Zope 3 <browser:page>
"""

def __init__(self, context, request):
self.context = context
self.request = request

def __call__(self, url, host, port, path):
"""
:return: None if no redirect needed, otherwise a string full HTTP URL to the redirect target

:raise: zExceptions.Redirect or other custom redirect exception if needed
"""

# Simple example: always access site over www. domain prefix
if not url.startswith("http://www."):
return url.replace("http://", "http://www.")

# Don't redirect if we are already using www. prefix
return None

Example ZCML::

<browser:page
name="redirect_handler"
for="Products.CMFCore.interfaces.ISiteRoot"
layer="YOUR_ADDON_LAYER"
class=".redirector.TestRedirectHandler"
/>

Internals
-----------

``collective.scriptedredirect`` hooks itself to Zope's pre-traversal hook and is
triggered before the request traverses into your Plone site in Zope application server.

Author
------

Mikko Ohtamaa (`blog <https://opensourcehacker.com>`_, `Facebook <https://www.facebook.com/?q=#/pages/Open-Source-Hacker/181710458567630>`_, `Twitter <https://twitter.com/moo9000>`_, `Google+ <https://plus.google.com/u/0/103323677227728078543/>`_)




Changelog
=========

1.1
-----

- Added redirects via browser view support [miohtama]

- Testing, Travis CI support [miohtama]

1.1 (2013-04-14)
----------------

- Initial development [miohtama]