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Now that the authentication and authorization facilities are in place, let s pause for a moment to look at how and why Pylons generates error documents such as the 403 error document shown in Figure 19-1. In certain circumstances, your Pylons application will return a status code that isn t 200. This might be because the URL requested doesn t exist, because the user is not authorized to view a particular URL, or occasionally because there is a bug in your code that caused an exception. Most browsers will understand the status code and display some sort of error message so that the user knows what went wrong, but rather than relying on the browser to inform the user of the problem, it is often preferable for your application to display an error document so that the page contains the same branding as the rest of your site. As you saw in 17, whenever a response with a 401, 403, 404, or 500 response is returned down the middleware chain as far as the StatusCodeRedirect middleware, it is intercepted, and a request is forwarded to your project s error controller. The exact HTTP response status codes to be intercepted can be customized by changing the arguments to the StatusCodeRedirect middleware. The error controller itself is a special controller set up by Pylons specifically for generating error documents. Your project s controllers/error.py will look something like this: import cgi import os.path

Listing 3-3. Modifying and applying a custom policy QSizePolicy policy = label->sizePolicy(); policy.setHorizontalStretch( 3 ); label->setSizePolicy( policy ); policy = lineEdit->sizePolicy(); policy.setHorizontalStretch( 1 ); lineEdit->setSizePolicy( policy ); The code in Listing 3-3 shows two things. First, it shows you how to copy and apply a policy using sizePolicy and setSizePolicy. It also shows stretch factors, with which you can control the relative size of the widgets in a dialog. Three buttons are shown (see Figure 3-5), and all have been assigned the horizontal size policy Preferred. Their stretch factors are (left to right) 1, 3, and 2. This means that the first button takes 1/(1+3+2) one-sixth of the width available; the second button takes 3/(1+3+2) one-half; and the third uses 2/(1+3+2) one-third.

paste.urlparser import StaticURLParser pylons import request pylons.controllers.util import forward pylons.middleware import error_document_template, media_path webhelpers.html.builder import literal

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An alternative to using HTTP POST to maintain state across HTTP requests would be to use cookies. A cookie is a piece of state that is maintained by a client. When a web server gives a cookie to a client browser, that client browser is expected to give the cookie back to the server in subsequent HTTP requests. However, since web servers cannot, in general, trust web clients, web servers do not have any guarantees that a web client will return the cookie that it was given. We cover cookies here because they are an alternative to transmitting session-ids and other authentication credentials.

Figure 3-5. Buttons with stretch factors (left to right: 1, 3, and 2)

from simplesite.lib.base import BaseController class ErrorController(BaseController): def document(self): """Render the error document""" resp = request.environ.get('pylons.original_response') content = literal(resp.body) or cgi.escape(request.GET.get('message')) page = error_document_template % \ dict(prefix=request.environ.get('SCRIPT_NAME', ''), code=cgi.escape(request.GET.get('code', str(resp.status_int))), message=content) 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) When the StatusCodeRedirect middleware forwards a request, it does so by passing the status code and status message to the document() action of the error controller by modifying the request so that it looks as if it came from a URL such as this: /error/document code=404&message=Not%20Found. It is the responsibility of the document() action to then return the HTML of the error document with the code and message provided. For the default implementation, the error document is generated from the Python string error_document_template in the pylons.middleware module, which is used to generate a response after the code, and messages have been substituted in the appropriate places. What is craftier is that to avoid having to add error document static files into your project template, the Pylons developers have added two further actions, img() and style(), that both create a static file server application and serve the static files from the Pylons module directory. (They use the same StaticURLParser WSGI application that is used to serve files from your project directory.) The template then references these actions so that all the images and CSS styles that the default template use are actually served from the Pylons module directory and don t clutter up your application.

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