"""Pylons' WSGI middlewares"""
import os.path
import urllib
from paste.errordocument import StatusBasedForward
from paste.recursive import RecursiveMiddleware
from paste.urlparser import StaticURLParser
from paste.deploy.converters import asbool
from webhelpers.rails.asset_tag import javascript_path
media_path = os.path.join(os.path.dirname(__file__), 'media')
class StaticJavascripts(object):
"""Middleware for intercepting requests for WebHelpers' included
javascript files.
Triggered when PATH_INFO begins with '/javascripts/'.
"""
def __init__(self):
self.javascripts_app = \
StaticURLParser(os.path.dirname(javascript_path))
def __call__(self, environ, start_response):
if environ.get('PATH_INFO', '').startswith('/javascripts/'):
return self.javascripts_app(environ, start_response)
else:
return self.javascripts_app.not_found(environ, start_response)
def ErrorHandler(app, global_conf, **errorware):
"""ErrorHandler Toggle
If debug is enabled, this function will return the app wrapped in
our customized Paste EvalException middleware we have called the
``PylonsEvalException``.
Otherwise, the app will be wrapped in the Paste ErrorMiddleware, and
the ``errorware`` dict will be passed into it.
"""
if asbool(global_conf.get('debug')):
from pylons.error import PylonsEvalException
app = PylonsEvalException(app, global_conf, **errorware)
else:
from paste.exceptions.errormiddleware import ErrorMiddleware
if 'error_template' in errorware:
del errorware['error_template']
app = ErrorMiddleware(app, global_conf, **errorware)
return app
def error_mapper(code, message, environ, global_conf=None, **kw):
if environ.get('pylons.error_call'):
return None
else:
environ['pylons.error_call'] = True
if global_conf is None:
global_conf = {}
codes = [401, 403, 404]
if not asbool(global_conf.get('debug')):
codes.append(500)
if code in codes:
# StatusBasedForward expects a relative URL (no SCRIPT_NAME)
url = '/error/document/?%s' % (urllib.urlencode({'message': message,
'code': code}))
return url
def ErrorDocuments(app, global_conf=None, mapper=None, **kw):
"""Wraps the app in error docs using Paste RecursiveMiddleware and
ErrorDocumentsMiddleware
All the args are passed directly into the ErrorDocumentsMiddleware. If no
mapper is given, a default error_mapper is passed in.
"""
if global_conf is None:
global_conf = {}
if mapper is None:
mapper = error_mapper
return RecursiveMiddleware(StatusBasedForward(app, global_conf=global_conf,
mapper=mapper, **kw))
error_document_template = """\
Server Error %(code)s
s/error/img/logo.gif "Pylons"){kind=logo}
s/error/img/warning.gif)