pylons_app/config/middleware.py

"""Pylons middleware initialization"""
from beaker.middleware import SessionMiddleware
from paste.cascade import Cascade
from paste.registry import RegistryManager
from paste.urlparser import StaticURLParser
from paste.deploy.converters import asbool
from pylons.middleware import ErrorHandler, StatusCodeRedirect
from pylons.wsgiapp import PylonsApp
from routes.middleware import RoutesMiddleware
from paste.auth.basic import AuthBasicHandler
from pylons_app.lib.simplehg import SimpleHg
from pylons_app.config.environment import load_environment
from pylons_app.lib.auth import authfunc 

def make_app(global_conf, full_stack=True, static_files=True, **app_conf):
    """Create a Pylons WSGI application and return it

    ``global_conf``
        The inherited configuration for this application. Normally from
        the [DEFAULT] section of the Paste ini file.

    ``full_stack``
        Whether or not this application provides a full WSGI stack (by
        default, meaning it handles its own exceptions and errors).
        Disable full_stack when this application is "managed" by
        another WSGI middleware.

    ``app_conf``
        The application's local configuration. Normally specified in
        the [app:<name>] section of the Paste ini file (where <name>
        defaults to main).

    """
    # Configure the Pylons environment
    config = load_environment(global_conf, app_conf)


    # The Pylons WSGI app
    app = PylonsApp(config=config)

    
    # Routing/Session/Cache Middleware
    app = RoutesMiddleware(app, config['routes.map'])
    app = SessionMiddleware(app, config)
    
    # CUSTOM MIDDLEWARE HERE (filtered by error handling middlewares)    
    app = SimpleHg(app, config)
    app = AuthBasicHandler(app, config['repos_name'] + ' mercurial repository', authfunc)    
    
    if asbool(full_stack):
        # Handle Python exceptions
        app = ErrorHandler(app, global_conf, **config['pylons.errorware'])

        # Display error documents for 401, 403, 404 status codes (and
        # 500 when debug is disabled)
        if asbool(config['debug']):
            app = StatusCodeRedirect(app)
        else:
            app = StatusCodeRedirect(app, [400, 401, 403, 404, 500])
    
    # Establish the Registry for this application
    app = RegistryManager(app)

    if asbool(static_files):
        # Serve static files
        static_app = StaticURLParser(config['pylons.paths']['static_files'])
        app = Cascade([static_app, app])
    
        app.config = config

    return app