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A template attribute definition uses the Velocity Template Language to construct values from its dependencies.
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Note that at present, it is only safe/useful to use a DataConnector as a dependency to this plugin. Using an AttributeDefinition as a dependency (no matter the type) will produce very confusing results. |
1. Define the Definition
The definition is defined with the element <resolver:AttributeDefinition xsi:type="Template" xmlns="urn:mace:shibboleth:2.0:resolver:ad"> with the following required attribute:
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- dependencyOnly - a boolean flag that indicates the attribute produced by this definition is used only by other resolver components and should not be released from the resolver (default value: false)
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<resolver:AttributeDefinition xsi:type="Template" xmlns="urn:mace:shibboleth:2.0:resolver:ad"
id="UNIQUE_ID">
<!-- Remaining configuration from the next step go here -->
</resolver:AttributeDefinition>
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Dependencies are expressed by the <resolver:Dependency> with a ref attribute whose value is the unique ID of the attribute definition or the data connector that this connector depends on.
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<resolver:AttributeDefinition xsi:type="Template" xmlns="urn:mace:shibboleth:2.0:resolver:ad"
id="UNIQUE_ID">
<resolver:Dependency ref="DEFINITIONCONNECTOR_ID_1" />
<resolver:Dependency ref="DEFINITION_ID_2" />
<resolver:Dependency ref="CONNECTOR_ID_31" />
<resolver:Dependency ref="CONNECTOR_ID_4" />
<!-- Remaining configuration from the next step go here -->
</resolver:AttributeDefinition>
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Template attribute definitions require one or more <SourceAttribute> elements to define which attributes from the definitionconnector's dependencies will be made available to the template engine. Note, every source attribute must have the same number of values.
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The following example demonstrates constructing eduCourseOffering attributes by combining three different attributes obtained from the definition's dependencies.
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<resolver:AttributeDefinition xsi:type="Template" xmlns="urn:mace:shibboleth:2.0:resolver:ad"
id="eduCourseOffering">
<resolver:Dependency ref="myDatabase" />
<Template>
<![CDATA[
http://example.edu/courses/${academic_term}/${course_id}/${course_section}
]]>
</Template>
<SourceAttribute>academic_term</SourceAttribute>
<SourceAttribute>course_id</SourceAttribute>
<SourceAttribute>course_section</SourceAttribute>
</resolver:AttributeDefinition>
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