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A common application design is to place files that require authentication in a separate directory. With ASP.NET configuration files, this approach is easy. Just leave the default <authorization> settings in the normal parent directory, and add a web.config file that specifies stricter settings in the secured directory. This web.config simply needs to deny anonymous users (all other settings and configuration sections can be omitted). <!-- This web.config file is in a subfolder. --> <configuration> <system.web> <authorization> <deny users=" " /> </authorization> </system.web> </configuration>

Note You cannot change the <authentication> tag settings in the web.config file of a subdirectory in your

application. Instead, all the directories in the application must use the same authentication system. However, each directory can have its own authorization rules.

Thanks to the XML utility class (which is imported into the function on line 38 of Listing 14-9), parsing through all those XML tags is made much easier Line 39, for instance, creates a new XML utility class object from the contents of $File, which currently contains the contents of the dataxml file With this object, XML utility functions are available to the DataSource such as counting the number of child nodes for a particular tag, pulling names and values from the XML data, and so forth A handy method for cutting down on the number of loops through all those tags and nodes is to use the Set utility class, which is done on lines 39 and 40 The Set utility contains several functions for working with result sets of data.

Generally, setting file access permissions by directory is the cleanest and easiest approach. However, you also have the option of restricting specific files by adding <location> tags to your web.config file. The location tags sit outside the main <system.web> tag and are nested directly in the base <configuration> tag, as shown here: <configuration> <system.web> ... <authentication mode="Forms"> <forms loginUrl="~/Login.aspx" /> </authentication> <authorization> <allow users="*" /> </authorization> </system.web> ...

<location path="SecuredPage.aspx"> <system.web> <authorization> <deny users=" " /> </authorization> </system.web> </location> <location path="AnotherSecuredPage.aspx"> <system.web> <authorization> <deny users=" " /> </authorization> </system.web> </location> </configuration> In this example, all files in the application are allowed, except SecuredPage.aspx and AnotherSecuredPage.aspx, which have an additional access rule denying anonymous users. Notice that even when you use multiple <location> sections to supply different sets of authorization rules, you still only include one <authentication> section. That s because a web application can use only one type of authentication.

Next, use Solver to forecast the average December yearly precipitation total for all cities. Assume a yearly precipitation combined average of 3 inches, with no monthly precipitation totals of less than 1 inch or more than 10 inches.

Cake s core libraries use this utility when constructing the arrays that make $this->data and $this->params, which has proven useful in earlier chapters when we explored the Form helper and managing form submissions Using Set not only cuts down on the number of operations needed to construct Cake-friendly data arrays but can be used with the XML utility to piece together an array of data from the XML file that matches the standard arrays used in the model On line 39, Set::reverse() is used together with a new instantiation of the XML utility class object to create a Cake-friendly array out of the XML tags The Set::reverse() function is used here because it converts objects into arrays This array would vary in its structure depending on the hierarchy in the XML file and can even be inconsistent depending on how many <post> tags appear in $this->File.

Tip You can also use the location tags to set rules for a specific subdirectory. It s up to you whether you

want to use this approach or you prefer to create separate web.config files for each subdirectory, as described in the previous section.