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The <AttributeFilterScript> element contains a script (or a reference to a script) that implements that ultimately applies an implementation of Predicate<Attribute> to a given entity attribute.

The <AttributeFilterScript> element implicitly iterates over all entity attributes in the input streammetadata pipeline. For each entity attribute, the entity attribute is removed from the input stream if (and only if) the predicate evaluates to false.

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The following sections describe the attributes and elements of the ScriptType type.

Examples

The following examples assume the default JavaScript language.

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Script Context

A script contained by an <AttributeFilterScript> element has access to an object called input by convention. The actual input argument is an instance of a class that implements the Attribute interface.

If the customObjectRef attribute is present on the <AttributeFilterScript> element, the result of the referenced Spring bean is made available to the script via a second object called custom. The type of the custom object is determined by the Spring bean.

Examples

If the customObjectRef attribute is not present on the <AttributeFilterScript> element, the script operates on a single input argument. The following trivial implementation of Predicate<Attribute> always returns false regardless of the input argument:

<AttributeFilterScript><ConditionScript>
    <Script>
    <![CDATA[
        // An implementation of Predicate<Attribute>"use strict";
        false;
   // applied]]>
to the input argument </Script>
</ConditionScript>

A more complex example might use the custom object to help the operation.

<Script>
    <![CDATA[
 //       "use strict";
// The input argument is of type:  var someCondition = function(attributeValueCount) {
  // org.opensaml.saml.saml2.core.Attribute         // Good stuff
      (function (attribute) {  }
         
   "use strict";    var result;
        // do not remove the entity attribute
    CustomObjectRef points to a <util:map> where the key is a string and the value is an 'interesting bean'
        if (attribute === null) { return true; }

(someCondition(input.getValues.size()) {
            result = custom["myAttributePredicate"].someFunction(input);
        } else {
           // implementresult the predicate here...= custom["myOtherAttributePredicate"].someOtherFunction(input);
        }(input))
        result;
    ]]>
    </Script>
</AttributeFilterScript>

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<Script>
    <![CDATA[
        "use strict";
        var someCondition = function(entityID) {
            // Good stuff
        }
         
        var result;
        // CustomObjectRef points to a <util:map> where the key is a string and the value is an 'interesting bean'
        if (someCondition(input.getEntityID())) {
            result = custom["myFirstBean"].someFunction(input);
        } else {
            result = custom["mySecondBean"].someOtherFunction(input);
        }
        result;
    ]]>
    </Script>

<Script>
    <![CDATA[
        "use strict";
        var someCondition = function(entityID) {
            // Good stuff
        }
         
        var result;
        // CustomObjectRef points to a <util:map> where the key is a string and the value is an 'interesting bean'
        if (someCondition(input.getEntityID())) {
            result = custom["myFirstBean"].someFunction(input);
        } else {
            result = custom["mySecondBean"].someOtherFunction(input);
        }
        result;
    ]]>
    </Script>