PathInfo.py :  » Web-Frameworks » Aquarium » aquarium-2.3 » aquarium » urlscheme » Python Open Source

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Python Open Source » Web Frameworks » Aquarium 
Aquarium » aquarium 2.3 » aquarium » urlscheme » PathInfo.py
"""This URL scheme is based on ``PATH_INFO``."""

__docformat__ = "restructuredtext"

# Created: Wed Feb 25 11:59:15 PST 2004
# Author: Shannon -jj Behrens
# Email: jjinux@users.sourceforge.net
#
# Copyright (c) Shannon -jj Behrens.  All rights reserved.

import re

from QueryParameters import QueryParameters


class PathInfo(QueryParameters):

    """This URL scheme is based on ``PATH_INFO``.

    ``PATH_INFO`` is used to the set the screen in the URL's.  Otherwise, this
    class is just like aquarium.urlscheme.QueryParameters_, which this class
    derives from.

    See aquarium.urlscheme.UrlSchemeAPI_.

    Hiding the ``index.cgi`` or ``index.fcgi`` in Apache with mod_rewrite
    =====================================================================

    To change URLs such as ``http://www.example.com/index.fcgi/fancy_page``
    into URLs such as ``http://www.example.com/fancy_page`` under Apache,
    use mod_rewrite::

        <Directory "/var/www/html">
            ...

        # This rewrites the URL so that everything that isn't a static file
        # goes through index.fcgi.  Change the .fcgi to .cgi if you're not
        # using FastCGI.
            RewriteEngine On
            RewriteCond %{REQUEST_FILENAME} !-f
            RewriteRule ^(.*)$ /index.fcgi/$1 [L]
        </Directory>

    .. _aquarium.urlscheme.QueryParameters:
      aquarium.urlscheme.QueryParameters.QueryParameters-class.html
    .. _aquarium.urlscheme.UrlSchemeAPI:
      aquarium.urlscheme.UrlSchemeAPI-module.html

    """

    def screen(self, screen, vars=None, secure=-1):
        """Return a dynamic URL for the given screen."""
        if vars is None:
            vars = {}
        ctx = self._ctx
        cgiEnv = self._ctx.wsa.getCgiEnv()
        scriptName = cgiEnv["SCRIPT_NAME"]
        if scriptName == "" or scriptName == "/":
            scriptFile = ""
        else:
            scriptFile = scriptName[scriptName.rindex("/") + 1:] + "/"
        url = "".join([self.getRootUrl(secure), scriptFile,
                       re.sub(r"\.", "/", screen)])
        return self.addVars(url, vars)

    def whichScreen(self):
        """Which screen does the user want to view?"""
        screen = self._ctx.wsa.getCgiEnv().get("PATH_INFO", None)
        if not screen:
            return None
        if screen.startswith("/"):
            screen = screen[1:]
        return re.sub("/", ".", screen)
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