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/** location of the password file on disk */ private static String dPwdFile; /** chooses a salt for the user, computes the salted hash of the user's password, and adds a new entry into the userMap hashtable for the user. */ public static void add(String username, String password) throws Exception { int salt = chooseNewSalt(); HashedPasswordTuple ur = new HashedPasswordTuple(getSaltedHash(password, salt), salt); dUserMap.put(username,ur); } /** computes a new, random 12-bit salt */ public static int chooseNewSalt() throws NoSuchAlgorithmException { return getSecureRandom((int)Math.pow(2,12)); } /** returns a cryptographically random number in the range [0,max) */ private static int getSecureRandom(int max) throws NoSuchAlgorithmException { SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); return Math.abs(sr.nextInt()); } /** returns a salted, SHA hash of the password */ public static String getSaltedHash(String pwd, int salt) throws Exception { return computeSHA(pwd + "|" + salt); } /** returns the SHA-256 hash of the provided preimage as a String */ private static String computeSHA(String preimage) throws Exception { MessageDigest md = null; md = MessageDigest.getInstance("SHA-256"); md.update(preimage.getBytes("UTF-8")); byte raw[] = md.digest(); return (new sun.misc.BASE64Encoder().encode(raw)); } /** returns true if the username and password combo is in the database */ public static boolean checkPassword(String username, String password) { try { HashedPasswordTuple t = (HashedPasswordTuple)dUserMap.get(username); return (t == null) false : t.getHashedPassword().equals(getSaltedHash(password, t.getSalt())); } catch (Exception e) {

ll web applications and frameworks need some mechanism for mapping the URL that a user enters in the browser to the code that should be executed when the server receives the request Different languages and frameworks take different approaches to this In PHP- or CGI-based systems, the URL represents a path on the hard disk to the file that should be executed In Zope, URLs are treated as paths in an object hierarchy, and in Django, URLs are matched to code based on regular expressions Pylons doesn t use any of these approaches Instead, it uses a very powerful and flexible system called Routes, which is an improved version of the Ruby on Rails routing system Routes allows you to quickly and easily specify how groups of similar URLs map to your controllers; in turn, this allows you to create whatever URL structure you prefer for your application.

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On the application side, the QPluginLoader is still used in combination with QDir to find and load the plugins from the findFilters method in FilterDialog. However, for each filter found, several filters can be added to the QListWidget and the filters QMap. The new findFilters method is shown in Listing 11-33. The highlighted lines show that the names returned are added one by one to the map and list widget. Compare this listing with Listing 11-29. Listing 11-33. The findFilters method adds several filters from each plugin. void FilterDialog::findFilters() { foreach( QObject *couldBeFilter, QPluginLoader::staticInstances() ) { FilterInterface *filter = qobject_cast<FilterInterface*>( couldBeFilter ); if( filter ) { foreach( QString name, filter->names() ) { filters[ name ] = filter; ui.filterList->addItem( name ); } } } QDir path( "./plugins" ); foreach( QString filename, path.entryList(QDir::Files) ) { QPluginLoader loader( path.absoluteFilePath( filename ) ); QObject *couldBeFilter = loader.instance(); if( couldBeFilter ) { FilterInterface *filter = qobject_cast<FilterInterface*>( couldBeFilter ); if( filter ) { foreach( QString name, filter->names() ) { filters[ name ] = filter;

Unlike other lookup systems, the URL is completely decoupled from the code that handles it This also makes it easier to change your URL structure if you need to do so You ve already seen Routes in action in previous chapters For example, in 3 you saw a route that looked like this: mapconnect('/{controller}/{action}/{id}') Each of the labels between curly brackets represents dynamic parts of a route When a route is matched, the corresponding URL parts are matched, and their values are assigned to routing variables corresponding to the labels of the dynamic parts within the curly brackets In this way, the one route can be used to match a large range of URLs You can also use Routes to generate URLs with hurl_for() To do this, you need to import the Routes url_for() function into your project s lib/helpers.

} return false; } /** Password file management operations follow **/ public static void init(String pwdFile) throws Exception { dUserMap = HashedSaltedPasswordFile.load(pwdFile); dPwdFile = pwdFile; } /** forces a write of the password file to disk */ public static void flush() throws Exception { HashedSaltedPasswordFile.store (dPwdFile, dUserMap); } /** adds a new username/password combination to the database, or replaces an existing one. */ public static void main(String argv[]) { String pwdFile = null; String userName = null; try { pwdFile = argv[0]; userName = argv[1]; init(pwdFile); System.out.print("Enter new password for " + userName + ": "); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String password = br.readLine(); add(userName, password); flush(); } catch (Exception e) { if ((pwdFile != null) && (userName != null)) { System.err.println("Error: Could not read or write " + pwdFile); } else { System.err.println("Usage: java " + "com.learnsecurity.MiniPasswordManager" + " <pwdfile> <username>"); } } } } /** This class is a simple container that stores a salt, and a salted, hashed password */ class HashedPasswordTuple { private String dHpwd; private int dSalt;

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