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The filter is an abstract class, defining an abstract method isValidRequest() that inspects the incoming request object before passing a verdict. If the method fails c, it is forwarded to a different URL d, which is defined in the configuration file for the web application b, which we ll look at shortly. This filter provides us with considerable flexibility in defining a concrete subclass. We can adapt it to more than one security strategy. Using the HTTP session One common approach is to create a token in the user s HTTP session when she logs in and check for the existence of that object in session during subsequent requests before performing any other actions. Listing 7.6 demonstrates a simple filter of this type.

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public class SessionTokenSecurityFilter extends GenericSecurityFilter { protected boolean isValidRequest(ServletRequest request) { boolean valid=false; HttpSession session=request.getSession(); if (session!=null){ UserToken token=(Token) session.getAttribute('userToken'); if (token!=null){ valid=true; } } return valid; } }

We re interested in managing only the exclusion list, so delete everything except Managed Background Sync Exclusions. The result appears in Figure 12-17.

Network settings are another aspect of client and server configuration that you can deal with more easily using a tool other than defaults. (We ll have more on network setup in 8.)

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asp.net code 128 reader

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This technique is commonly used in conventional web applications, typically forwarding to a login screen if validation fails. In an Ajax application, we are free to return a much simpler response in XML, JSON, or plain text, which the client could respond to by prompting the user to log in again. In chapter 11, we discuss a fuller implementation of such a login screen for our Ajax Portal application. Using encrypted HTTP headers Another common strategy for validating a request is to add an additional header to the HTTP request and check for its presence in the filter. Listing 7.7 shows a second example filter that looks for a specific header and checks the encrypted value against a known key held on the server.

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PlistBuddy is another tool for modifying property list files. In many ways, the functionality of the defaults command and PlistBuddy overlap. But PlistBuddy is better-suited for more complex structures. The defaults command is great for modifying simple data types, such as numbers, strings, dates, and to an extent, arrays. Once you start dealing with more complex structures, though, such as nested dictionaries, you can quickly find yourself in a headache-inducing maze of nested braces. For these complex files, PlistBuddy can help. You ll find the tool in the /usr/libexec directory and you can invoke it either interactively or non-interactively. For the purposes of deployment, we ll focus on the latter. PlistBuddy has many options, but for most scenarios you'll use the following arguments:

public class SecretHeaderSecurityFilter extends GenericSecurityFilter { private String headerName=null; public void init(FilterConfig config) throws ServletException { super.init(config); Configure header headerName=config.getInitParameter("headerName"); name } protected boolean isValidRequest(ServletRequest request) { boolean valid=true; HttpServletRequest hrequest=(HttpServletRequest)request; if (headerName!=null){ valid=false; String headerVal=hrequest.getHeader(headerName); Get header value Encrypter crypt=EncryptUtils.retrieve(hrequest); if (crypt!=null){ valid=crypt.compare(headerVal); Compare header value } } return valid; }

Print key: Prints the value of the specified key or the entire file if none is provided. Set key value: Sets the value at entry. Add key type value: Adds a key with specified type and value. Types include string, array, dict, bool, real, integer, date, and data. Delete key: Deletes the specified key from the plist.

When testing the request, this filter reads a specific header name b and compares it with an encrypted value stored in the server session c. This value is transient and may be generated randomly for each particular session in order to make the system harder to crack. The Encrypter class uses the Apache Commons Codec classes and javax.security.MessageDigest classes to generate a hexencoded MD5 value. The full class listing is available in the downloadable code that accompanies this book. The principle of deriving a hex-encoded MD5 in Java is shown here:

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