#!/usr/bin/python2.5

#

# Copyright 2008 the Melange authors.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#   http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Document viewers.

public: how the general public sees a Document

"""

__authors__ = [

  '"Todd Larsen" <tlarsen@google.com>',

  ]

from soc.logic import out_of_band

from soc.logic import path_link_name

from soc.logic.models import document

from soc.views import helper

from soc.views import simple

from soc.views.helper import decorators

import soc.views.helper.responses

import soc.views.helper.templates

@decorators.view

def public(request, page=None, partial_path=None, link_name=None,

           template=DEF_DOCS_PUBLIC_TMPL):

  """How the "general public" sees a Document.

  Args:

    request: the standard django request object

    page: a soc.logic.site.page.Page object which is abstraction that combines 

      a Django view with sidebar menu info

    partial_path: the Document's site-unique "path" extracted from the URL,

      minus the trailing link_name

    link_name: the last portion of the Document's site-unique "path"

      extracted from the URL

    template: the "sibling" template (or a search list of such templates)

      from which to construct the public.html template name (or names)

  Returns:

    A subclass of django.http.HttpResponse which either contains the form to

    be filled out, or a redirect to the correct view in the interface.

  """

  # create default template context for use with any templates

  context = helper.responses.getUniversalContext(request)

  # TODO: there eventually needs to be a call to some controller logic that

  #   implements some sort of access controls, based on the currently

  #   logged-in User's Roles, etc.

  # TODO: based on the User's Roles, Documents that the User can edit

  #   should display a link to a document edit form

  doc = None

  # try to fetch User entity corresponding to link_name if one exists

  path = path_link_name.combinePath([partial_path, link_name])

  # try to fetch Document entity corresponding to path if one exists    

  try:

    if path:

      doc = document.logic.getFromFields(partial_path=partial_path,

                                         link_name=link_name)

  except out_of_band.ErrorResponse, error:

    # show custom 404 page when Document path doesn't exist in Datastore

    return simple.errorResponse(request, page, error, template, context)

  doc.content = helper.templates.unescape(doc.content)

  context['entity'] = doc

  return helper.responses.respond(request, template, context)