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return the byte[] as a Base-64 encoded String. Now to encrypt data, you can simply call the encodeAsBlowfish() method: def encrypted = "This is some secret info".encodeAsBlowfish() And to perform the associated decryption, you can call the decodeBlowfish() method: def unencrypted = encrypted.decodeBlowfish() We ll leave to your imagination what else might be possible with codec classes. They re certainly a pretty powerful way to provide common encoding and decoding methods across your application and yet another example of the use of conventions in Grails to enhance behavior. In the next section, we ll take a diversion into the topic of authentication and authorization, including coverage of the available security plugins for Grails.

TCP is a reliable, connection-oriented protocol that allows two computers to communicate over a network. It provides built-in flow control, sequencing, and error handling, which makes it reliable and easy to program. To create a TCP connection, one computer must act as the server and start listening on a specific endpoint. (An endpoint is a combination of an IP address and a port number.) The other computer must act as a client and send a connection request to the endpoint on which the first computer is listening. Once the connection is established, the two computers can take turns exchanging messages. .NET makes this process easy through its stream abstraction. Both computers simply write to and read from a System.Net.Sockets.NetworkStream to transmit data.

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Even though a TCP connection always requires a server and a client, an individual application could be both. For example, in a peer-to-peer application, one thread is dedicated to listening for incoming requests (acting as a server), and another thread is dedicated to initiating outgoing connections (acting as a client). In the examples provided with this chapter, the client and server are provided as separate applications and are placed in separate subdirectories.

Application-layer security, which consists of authenticating users at login and authorizing authenticated users to perform certain functions, is used in most nontrivial applications. In 4, you saw how to roll your own authentication mechanism with the UserController class, a trivial implementation that simply checks that a user exists in the database. Until now, however, we have not explained how authorization works through roles and permissions. As simple as it is to implement your own login mechanism, as your application grows you ll feel the need for more complex security rules. You could use roles to distinguish access to parts of the system for example, is the user an administrator or a regular user You may also want fine-grained permission access to individual resources. Typically, but not always, a role consists of multiple permissions. Rolling your own solution for all of these, potentially complex, security scenarios is rather wasteful given the abundance of security frameworks available for Grails. Currently, three widely used plugins offer security features to Grails: Acegi (Spring Security) plugin (http://www.grails.org/AcegiSecurity+Plugin): This integrates Grails with Spring Security (http://static.springframework.org/ spring-security/site/, formerly Acegi), a security framework that is part of the Spring portfolio of products. Authentication plugin (http://www.grails.org/Authentication+Plugin): The Authentication plugin is a simple security plugin that provides login and registration out of the box. Designed to use sensible defaults to configure most aspects authentication automatically, it lets you customize the behavior of the plugin via events. JSecurity plugin (http://www.grails.org/JSecurity+Plugin): The JSecurity plugin integrates the JSecurity framework for Java (http://www.jsecurity.org/) with Grails. It provides helpers to automatically generate login and registration functionality. In the next section, we ll cover filters, a feature of Grails that underpins all of these frameworks. After that, we ll dive headfirst into integrating the JSecurity plugin into the gTunes application.

Once a TCP connection is established, the two computers can send any type of data by writing it to the NetworkStream. However, it s a good idea to begin designing a networked application by defining the application-level protocol that clients and servers will use to communicate. This protocol includes constants that represent the allowable commands, ensuring that your application code doesn t include hard-coded communication strings.

s Note Wi-Fi is a wireless technology. Your iPod touch uses two kinds of Wi-Fi standards: IEEE 802.11b and

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