# -*- python -*-
# -*- coding: utf-8 -*-
#
# DDPortfolio service ErrorController
# Copyright (c) 2009 Jan Dittberner <jan@dittberner.info>
#
# This file is part of DDPortfolio service.
#
# DDPortfolio service is free software: you can redistribute it and/or
# modify it under the terms of the GNU Affero General Public License
# as published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
#
# DDPortfolio service is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with this program.  If not, see
# <http://www.gnu.org/licenses/>.
#
import cgi
import os.path

from paste.urlparser import StaticURLParser
from pylons.middleware import error_document_template, media_path

from ddportfolioservice.lib.base import *

class ErrorController(BaseController):
    """Generates error documents as and when they are required.

    The ErrorDocuments middleware forwards to ErrorController when error
    related status codes are returned from the application.

    This behaviour can be altered by changing the parameters to the
    ErrorDocuments middleware in your config/middleware.py file.
    
    """
    def document(self):
        """Render the error document"""
        page = error_document_template % \
            dict(prefix=request.environ.get('SCRIPT_NAME', ''),
                 code=cgi.escape(request.params.get('code', '')),
                 message=cgi.escape(request.params.get('message', '')))
        return page

    def img(self, id):
        """Serve Pylons' stock images"""
        return self._serve_file(os.path.join(media_path, 'img'), id)

    def style(self, id):
        """Serve Pylons' stock stylesheets"""
        return self._serve_file(os.path.join(media_path, 'style'), id)

    def _serve_file(self, root, path):
        """Call Paste's FileApp (a WSGI application) to serve the file
        at the specified path
        """
        static = StaticURLParser(root)
        request.environ['PATH_INFO'] = '/%s' % path
        return static(request.environ, self.start_response)