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We will now implement a system that will allow users to change the order of the images associated with a blog post. While this may not seem overly important, we do this because we are controlling the layout of images when blog posts are displayed. Additionally, in the next section we will modify the blog index to display an image beside each blog post that has one. If a blog post has more than one image, we will use the first image for the post.

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An alternative and somewhat simpler way to get variables such as this is by putting rules into a .htaccess file. These are evaluated at the end of the process, and so they happen after other variables have been set. This requires that you set AllowOverride FileInfo, however, which you may not want to do.

RewriteCond directives apply to the first RewriteRule directive that follows them; they don t affect any subsequent rules. However, you can use a RewriteRule to set an environment variable that does allow you to use a set of conditions more than once. The following series of rewrite rules creates a variable trusted that s set to either yes or no, depending on the result of a chain of RewriteCond conditions:

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# set the trusted variable to no by default SetEnv trusted=no # now test for trusted hosts RewriteCond %{REMOTE_ADDR} ^192\.168.* [OR] RewriteCond %{REMOTE_ADDR} ^127\.0\.0\.1 [OR] RewriteCond %{REMOTE_HOST} ^trusted.comrade.com$ # if the host passes the test, set the trusted variable to yes RewriteRule .* [E:trusted=yes]

In the past, programmers have used two common techniques to allow users to change the order of list items, both of which are slow and difficult to use. The first method was to provide up and down links beside each item in the list, which moved the items up or down when clicked. Some of these implementations might have included a move to top and move to bottom button, but on the whole they are difficult to use. The other method was to provide a text input box beside each item. Each box contained a number, which determined the order of the list. To change the order, you would update the numbers inside the boxes. For our implementation, we will use a drag-and-drop system. Thanks to Scriptaculous s Sortable class, this is not difficult to achieve. We will implement this by extending the BlogImageManager JavaScript class we created earlier this chapter.

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The final RewriteRule performs no actual rewrite but sets the variable to yes if the remote host passes all the access conditions. You can now use this variable as input to other tests without needing to go through the access checks again:

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# use the condition to redirect untrusted hosts to the homepage RewriteCond %{ENV:trusted} ^no$ RewriteRule .* /index.html [R] # use the condition again to invisibly return pages from a trusted subdirectory RewriteCond %{ENV:trusted} ^yes$ RewriteRule (.*) /trusted/$1 # and now use the condition to deny access to the URL should someone try to access # it directly. We could also use a RewriteRule with an [F] flag to forbid the URL. <Directory /trusted> order deny,allow deny from all allow from env trusted=yes </Directory>

As the previous example shows, you aren t limited to using this variable in RewriteCond conditions; it works just fine with the allow directive, too. It ll also be passed to any CGI scripts that are triggered by a successful request, so you can make use of it there as well.

Note As an exercise, try extending this reordering system so it is accessible for non-JavaScript users.

Both RewriteRule and RewriteCond allow you to extract values from their regular expressions using parentheses. The values extracted from RewriteRule are placed into the special variables $1, $2, $3, and so on. To allow you to also use values extracted from a RewriteCond, mod_rewrite makes these values available to the RewriteRule as %1, %2, %3... The percent symbol differentiates these values from the $1, $2, $3... syntax used to access values extracted from the rewrite rule s own pattern. For example:

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