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CHAPTER 1 GETTING STARTED
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Figure 1-19. SSL request is made when the URL is HTTPS.
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When the browser makes a request that is prefixed with the identifier HTTPS, then SSL is implied. To be able to make SSL requests, the server has to make an SSL port available. This involves getting a server certificate and is an administrative issue. With SSL, your communication is mostly secure because anybody listening would see traffic with encrypted packets. With SSL, it is possible to execute a man-in-the-middle attack. Without getting into the details of encryption, this is possible because SSL doesn t manage who can access your service. I m not trying to make SSL seem insecure, because it is not. For example, when they use SSL, most browsers verify the identity of the server. This means that if you access a server that identifies itself as being Amazon, then you can be certain it is Amazon. Problems arise when applications don t look closely at the server identifier. And believe me, not many people verify the certificates. Often this means tightly controlling which certificates can be added and manipulated in the browser. Again, this is an administration issue. Using access control identifiers to control access to a Web service is a good idea, but it does open you up to hackers. Alternatively, you could create a secure channel, as illustrated Figure 1-20.
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Figure 1-20. Secure channel request
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The client doesn t make a remote request, but rather makes a local request. A locally running process captures the local request and securely packages the request, which is sent to a remote process. The remote process unwraps the package and makes a local request. The communication between the two processes is a secure channel that the client and server applications don t influence. For each, it appears that the request is local. The advantage of this technique is the ability of the paired running processes to verify each other and allow only authorized and authenticated communications. The paired process approach is a secure approach, so long as the keys are exchanged properly. Again, that is an administrative issue. To realize the paired process approach, you could use one of the following open source software technologies: SSH, Stunnel, or OpenVPN. There is another approach to exchanging data securely, but I don t recommend it. You could implement your own encryption using publicly available encryption libraries, but I don t believe that you should manage your own security. Security is a complex topic, and some experts spend every working day of their lives figuring out how to secure systems. Even if you spend a week, a month, or even two months on the topic, you won t have come close to the issues relating to a secure system. Thus, leave security to the experts and use the available security. On the other hand, this doesn t mean that you cannot ask intelligent questions and suggest the type of system you would like.
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When thinking about Ajax security and intellectual property, remember the following points: There is no intellectual property protection with an Ajax application. There is no intellectual property protection with traditional applications either. To keep your intellectual property private, use Web services. In most cases, SSL is good enough for managing security. Use a secured channel approach to strictly control access to your Web services. Don t try to manage security yourself, unless you happen to be an administrator or security specialist. Security is a complex topic that requires a good understanding of the issues.
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CHAPTER
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hen you write an Ajax application, you use the JavaScript programming language. JavaScript is a duck-typed programming language, and one of the main questions when using it is how to best structure the code. Do you write your code using object-oriented techniques Do you write your code using dynamic language programming techniques Or do you use functions and no objects The answer is that you use all of the aforementioned techniques and then some. JavaScript represents an evolution in programming capabilities. Sure, some things do not work as they would in a traditional programming language, but that does not mean there is a problem. In fact, I would say JavaScript frees you up to write code that is more flexible and maintainable because it is more compact and easier to assemble. Think about it: what do you normally do in an object-oriented programming (OOP) language Your main task in traditional OOP is sorting out the referencing, for example, how to make a dog class reference a person class without hard-coding it, but this is trivial in JavaScript you just tell it. JavaScript requires that you break certain traditional programming habits, and that is what the recipes in this chapter cover. In this chapter, you ll learn how to write reusable, maintainable code in JavaScript s dynamic, duck-typed, object-oriented way.
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