app/soc/views/helper/responses.py
author Sverre Rabbelier <srabbelier@gmail.com>
Sat, 24 Oct 2009 16:23:31 -0700
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permissions -rw-r--r--
GSoC Views
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#!/usr/bin/python2.5
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#
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# Copyright 2008 the Melange authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#   http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Helpers used to render response.
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"""
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__authors__ = [
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  '"Todd Larsen" <tlarsen@google.com>',
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  '"Pawel Solyga" <pawel.solyga@gmail.com>',
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  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
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  ]
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from google.appengine.api import users
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from django import http
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from django.template import loader
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from soc.logic import accounts
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from soc.logic import system
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from soc.logic.helper import timeline
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from soc.logic.models import site
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from soc.logic.models.user import logic as user_logic
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from soc.modules import callback
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from soc.views import helper
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from soc.views.helper import redirects
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from soc.views.helper import templates
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def respond(request, template, context=None, response_args=None,
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            response_headers=None):
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  """Helper to render a response, passing standard stuff to the response.
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  Args:
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    request: the Django HTTP request object
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    template: the template (or search list of templates) to render
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    context: the context supplied to the template (implements dict)
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    response_args: keyword arguments passed to http.HttpResponse()
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      (response_args['content'] is created with
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      render_to_string(template, dictionary=context) if it is not present)
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    response_headers: optional dict containing HTTP response header names
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      and corresponding values to set in the HttpResponse object before it
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      is returned; default is None
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  Returns:
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    django.shortcuts.render_to_response(template, context) results
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  Raises:
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    Any exceptions that django.template.loader.render_to_string() or
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    django.http.HttpResponse() might raise.
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  """
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  if not context:
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    from soc.views.helper import params
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    context = getUniversalContext(request)
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    useJavaScript(context, params.DEF_JS_USES_LIST)
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  if response_args is None:
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    response_args = {}
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  if 'content' not in response_args:
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    content = loader.render_to_string(template, dictionary=context)
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    response_args['content'] = content.strip('\n')
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  http_response = http.HttpResponse(**response_args)
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  if response_headers:
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    for key, value in response_headers.iteritems():
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      http_response[key] = value
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  return http_response
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def getUniversalContext(request):
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  """Constructs a template context dict will many common variables defined.
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  Args:
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    request: the Django HTTP request object
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  Returns:
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    a new context dict containing:
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    {
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      'request': the Django HTTP request object passed in by the caller
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      'account': the logged-in Google Account if there is one
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      'user': the User entity corresponding to the Google Account in
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        context['account']
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      'is_admin': True if users.is_current_user_admin() is True
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      'is_debug': True if system.isDebug() is True
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      'sign_in': a Google Account login URL
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      'sign_out': a Google Account logout URL
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      'sidebar_menu_html': an HTML string that renders the sidebar menu
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    }
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  """
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  core = callback.getCore()
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  context = core.getRequestValue('context', {})
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  if context:
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    return context
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  account = accounts.getCurrentAccount()
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  user = None
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  is_admin = False
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  context['request'] = request
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  if account:
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    user = user_logic.getForAccount(account)
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    is_admin = user_logic.isDeveloper(account=account, user=user)
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  context['account'] = account
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  context['user'] = user
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  context['is_admin'] = is_admin
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  context['is_local'] = system.isLocal()
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  context['is_debug'] = system.isDebug()
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  context['sign_in'] = users.create_login_url(request.path)
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  context['sign_out'] = users.create_logout_url(request.path)
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  context['sidebar_menu_items'] = core.getSidebar(account, user)
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  context['gae_version'] = system.getAppVersion()
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  context['soc_release'] = system.getMelangeVersion()
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  settings = site.logic.getSingleton()
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  context['ga_tracking_num'] = settings.ga_tracking_num
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  context['gmaps_api_key'] = settings.gmaps_api_key
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  context['site_name'] = settings.site_name
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  context['site_notice'] = settings.site_notice
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  context['tos_link'] = redirects.getToSRedirect(settings)
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  context['in_maintenance'] = timeline.isActivePeriod(settings, 'maintenance')
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  core.setRequestValue('context', context)
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  return context
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def useJavaScript(context, uses):
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  """Updates the context for JavaScript usage.
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  """
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  for use in uses:
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    context['uses_%s' % use] = True
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def redirectToChangedSuffix(
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    request, old_suffix, new_suffix=None, params=None):
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  """Changes suffix of URL path and returns an HTTP redirect response.
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  Args:
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    request: the Django HTTP request object; redirect path is derived from
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      request.path
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    old_suffix, new_suffix, params:  see helper.requests.replaceSuffix()
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  Returns:
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    a Django HTTP redirect response pointing to the altered path.
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  """
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  path = helper.requests.replaceSuffix(request.path, old_suffix, new_suffix,
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                                       params=params)
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  return http.HttpResponseRedirect(path)
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def errorResponse(error, request, template=None, context=None):
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  """Creates an HTTP response from the soc.views.out_of_band.Error exception.
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  Args:
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    errror: a out_of_band.Error object
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    request: a Django HTTP request
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    template: the "sibling" template (or a search list of such templates)
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      from which to construct the actual template name (or names)
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    context: optional context dict supplied to the template, which is
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      modified (so supply a copy if such modification is not acceptable)
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  """
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  if not context:
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    context = error.context
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  if not context:
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    from soc.views.helper import params
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    context = getUniversalContext(request)
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    useJavaScript(context, params.DEF_JS_USES_LIST)
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  if not template:
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    template = []
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  # make a list of possible "sibling" templates, then append a default
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  sibling_templates = templates.makeSiblingTemplatesList(template,
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      error.TEMPLATE_NAME, default_template=error.DEF_TEMPLATE)
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  context['status'] = error.response_args.get('status')
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  if not context.get('message'):
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    # supplied context did not explicitly override the message
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    context['message'] = error.message_fmt % context
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  return respond(request, sibling_templates, context=context,
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                 response_args=error.response_args)