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In all even slightly complex applications, you should explicitly list the variables that you expect to receive on input, and copy them out of the GPC array programmatically rather than manually, with a routine that looks something like this: < php $expected = array( 'carModel', 'year', 'bodyStyle' ); foreach( $expected AS $key ) { if ( !empty( $_POST[ $key ] ) ) { ${$key} = $_POST[ $key ]; } else { ${$key} = NULL; } } > After listing the expected variables in an array, we step through them with a foreach() loop, pulling a value out of the $_POST array for each variable that exists in it. We use the ${$key} construct to assign each value to a variable named for the current value of that key (so, for example, when $key is pointing to the array value year, the assignment creates a variable $year that contains the value of the $_POST array contained in the key year). With such a routine, it is easy to specify different expected variable sets for different contexts, so as to ensure that hidden interfaces stay hidden; here we add another variable to the array if we are operating in an administrative context: < php // user interface $expected = array( 'carModel', 'year', 'bodyStyle' ); // administrator interface if ( $admin ) { $expected[] = 'profit'; } foreach( $expected AS $key ) { if ( !empty( $_POST[ $key ] ) ) { ${$key} = $_POST[ $key ]; } else { ${$key} = NULL; } } > A routine like this automatically excludes inappropriate values from the script, even if an attacker has figured out a way to submit them. You can thus assume that the global environment will not be corrupted by unexpected user input.

Figure 5 10. JSF tags will be output as is. To really pass XHTML code (including JSF tags) to a custom tag, you can put the XHTML code into the tag body. Let s do it in p1.xhtml (see Listing 5 23). Listing 5 23. Passing XHTML Code As the Tag Body

Listing C-1 shows how to use the elements <object type="image/gif"> and <a> to make a clickable map (see Figures C-5 and C-6) with a GIF image. However, you can use <object> to embed objects of any MIME type (listed in http://www.iana.org/assignments/media-types/), including applets. This is important, because the <applet> element has been deprecated. You can also use <object> to download a video clip, as in the following example: <object data=myClip.mpeg type="video/mpeg" height="120" width="180"> <p>Click <a href=MyMovie.mpeg>here</a> to download</p> </object>

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When you are offering a user the chance to submit some sort of value via a form, you have the considerable advantage of knowing ahead of time what kind of input you should be getting. This ought to make it relatively easy to carry out a simple check on the validity of the user s entry, by checking whether it is of the expected type, length, and format.

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:foo="http://foo.com"> <p>This is page1.</p> <foo:box> <foo:pe product="#{currentProduct}"/> <foo:copyright company="Foo"/> </foo:box> </html>

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