Oracle® Fusion Middleware
Part 27. Utility Filters

The Evaluate Selector filter enables you to evaluate the contents of a specified selector expression, and return a boolean result. A selector is a special syntax that enables API Gateway configuration settings to be evaluated and expanded at runtime.

This filter enables you to evaluate a specified selector expression and make a decision in a policy based on whether the expression value fails or passes. For example, you could use the following expression to check if the user belongs to a particular group that allows the user to access a particular resource:

${user[0].memberOf.contains("CN=Group Policy Creator Owners,CN=Users,DC=acmeqa,DC=com")}

This expression checks if the memberOf attribute retrieved for the first user contains the specified value (in this case, membership of a particular group). If the expression matches, the filter will pass.

Alternatively, you could use the following selector expression to check if the user email address is valid:

${user[0].mail.contains("admin@qa.acme.com")}

This expression checks if the mail attribute retrieved for the first user contains the specified value (in this case, a particular email address). If the expression matches, the filter will pass.

For more details on selectors, see Selecting configuration values at runtime.

Name:

Enter a descriptive name for this filter.

Expression:

Enter the selector expression to be evaluated. Defaults to the following selector expression:

${1 + 1 == 2}