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py file: from routes import url_for Here s an example of how to use hurl_for(), which results in the URL /page/view/1 being generated: hurl_for(controller='page', action='view', id=1) As you can see, the arguments to hurl_for() correspond to the routing variable names used when defining the route When a user visits this URL, the same route used for generating the URL will also be used for matching it In this case, the URL generated by the earlier call to hurl_for() will also generate the routing variables controller='page', action='view', and id=1 when the URL is visited, and this results in the page controller s view() action being called with the ID 1 You can also give individual routes a name by specifying a string as the first argument to mapconnect() This reduces the amount of typing you have to do when generating URLs.

ui.filterList->addItem( name ); } } } } } When performing the actual filtering operation, the filter s name must be passed to the filter method (this is handled from the filterChanged slot shown in Listing 11-34 the small change has been highlighted in the listing). Compare the listing with Listing 11-25 to see the difference. Listing 11-34. Passing the filter s name to the filter method void FilterDialog::filterChanged( QString filter ) { if( filter.isEmpty() ) { ui.filteredLabel->setPixmap( *(ui.originalLabel->pixmap() ) ); } else { QImage filtered = filters[ filter ]->filter( filter, ui.originalLabel->pixmap()->toImage() ); ui.filteredLabel->setPixmap( QPixmap::fromImage( filtered ) ); } } With these minimal changes to the interface you have made it possible to package several plugins in one file. Compare the development cost of this process with the potential deployment issues that can occur when you have to manage more files that carry one plugin.

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For example, you might define this route: mapconnect('blog_entry', '/blog/view/{id}').

public HashedPasswordTuple(String p, int s) { dHpwd = p; dSalt = s; } /** Constructs a HashedPasswordTuple pair from a line in the password file. */ public HashedPasswordTuple(String line) throws Exception { StringTokenizer st = new StringTokenizer(line, HashedSaltedPasswordFile.DELIMITER_STR); dHpwd = st.nextToken(); // hashed + salted password dSalt = Integer.parseInt(st.nextToken()); // salt } public String getHashedPassword() { return dHpwd; } public int getSalt() { return dSalt; } /** returns a HashedPasswordTuple in string format so that it can be written to the password file. */ public String toString () { return (dHpwd + HashedSaltedPasswordFile.DELIMITER_STR + (""+dSalt)); } } /** This class extends a HashedPasswordFile to support salted, hashed passwords. */ class HashedSaltedPasswordFile extends HashedPasswordFile { /* The load method overrides its parent's, as a salt also needs to be read from each line in the password file. */ public static Hashtable load(String pwdFile) { Hashtable userMap = new Hashtable(); try { FileReader fr = new FileReader(pwdFile); BufferedReader br = new BufferedReader(fr); String line; while ((line = br.readLine()) != null) { int delim = line.indexOf(DELIMITER_STR); String username = line.substring(0,delim); HashedPasswordTuple ur = new HashedPasswordTuple(line.substring(delim+1)); userMap.put(username, ur); } } catch (Exception e) {

Almost all plugin technologies work by creating a DLL according to the target platform s standard approach. Such a library exposes C symbols that can be resolved and referenced with function pointers. Even Qt uses this approach, but wraps it in easy-to-use classes. If you open up the ASCII art image format plugin from earlier in this chapter by using the Dependency Walker (a free tool available from http://www.dependencywalker.com) on the Windows platform (you can use the objdump utility on GCC-based platforms), you can see the two exported symbols: qt_plugin_instance and qt_plugin_query_verification_data. (A screenshot from the tool is shown in Figure 11-7.) The QPluginLoader uses the QLibrary class internally to interface the C symbols exported to the DLL.

You could then generate a URL to the entry with ID 1 like this: h.url_for('blog_entry', id=1) Now that you have a rough feel for how Routes works, let s dive in straightaway and look at how Routes is set up and used in Pylons and how Pylons uses information from Routes to dispatch requests.

Note A dynamic link library can also be referred to as a shared library (as well as a DLL).

If an attacker is able to cause the variable query to contain, for example cookies"><script>evil-script;</script> then, after substitution, this will result in the HTML <form ...> <input name="query" value="cookies"><script>evil-script;</script>"> </form> That is, the attacker is able to close the quote and insert a script tag that will be executed by the browser.

One problem with Routes is that because it was originally ported from the Ruby on Rails implementation, it still contains a number of features that you might have used when developing a Pylons 0.9.6 project that are no longer considered good practice. In the section Unnecessary Routes Features later in this chapter, I ll explain why these features are no longer recommended. It is likely they will be removed in a future version of Routes, so it is important you avoid using them.

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