Add a common XSLT transform for cleaning imported metadata from other…

… metadata sources.

feds/clean_import.xsl

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+	
+	clean_import.xsl
+	
+	Clean up imported metadata from a metadata exchange channel.
+	
+-->
+<xsl:stylesheet version="1.0"
+	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+	xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
+	xmlns:elab="http://eduserv.org.uk/labels"
+	xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
+	xmlns:wayf="http://sdss.ac.uk/2006/06/WAYF"
+	xmlns:ukfedlabel="http://ukfederation.org.uk/2006/11/label"
+
+	xmlns="urn:oasis:names:tc:SAML:2.0:metadata"
+	exclude-result-prefixes="elab ukfedlabel wayf">
+
+	<!--Force UTF-8 encoding for the output.-->
+	<xsl:output omit-xml-declaration="no" method="xml" encoding="UTF-8" indent="yes"/>
+
+	<!-- strip everything from certain namespaces -->
+	<xsl:template match="elab:*"/>
+	<xsl:template match="ukfedlabel:*"/>
+	<xsl:template match="wayf:*"/>
+
+	<!-- strip redundant attributes from EntityDescriptor elements -->
+	<xsl:template match="md:EntityDescriptor/@ID"/>
+	<xsl:template match="md:EntityDescriptor/@cacheDuration"/>
+	<xsl:template match="md:EntityDescriptor/@validUntil"/>
+
+	<!-- strip xml:base entirely -->
+	<xsl:template match="@xml:base"/>
+
+	<!--By default, copy text blocks, comments and attributes unchanged.-->
+	<xsl:template match="text()|comment()|@*">
+		<xsl:copy/>
+	</xsl:template>
+
+	<!--By default, copy all elements from the input to the output, along with their attributes and contents.-->
+	<xsl:template match="*">
+		<xsl:copy>
+			<xsl:apply-templates select="node()|@*"/>
+		</xsl:copy>
+	</xsl:template>
+
+</xsl:stylesheet>

feds/common_beans.xml

@@ -112,6 +112,22 @@
         </property>
     </bean>
 
+    <!--
+        cleanImport
+        
+        A pipeline stage that can be used in an import pipeline to clean up the metadata
+        presented, for example by removing redundant attributes or elements which only have
+        meaning when added by the UK federation registrar.
+    -->
+    <bean id="cleanImport" class="net.shibboleth.metadata.dom.stage.XSLTStage">
+        <property name="id" value="cleanImport"/>
+        <property name="xslResource">
+            <bean class="org.opensaml.util.resource.FilesystemResource">
+                <constructor-arg value="#{ systemProperties['basedir'] }/feds/clean_import.xsl"/>
+            </bean>
+        </property>
+    </bean>
+
     <!--
         <bean id="members" class="uk.org.ukfederation.members.Members">
             <constructor-arg>

feds/edugain/import.xml

@@ -53,6 +53,7 @@
             <list>
                 <ref bean="fetchEduGainExportAggregate"/>
                 <ref bean="checkEdugainSignature"/>
+                <ref bean="cleanImport"/>
                 <ref bean="disassemble"/>
                 <ref bean="checkSchemas"/>
                 <ref bean="assemble"/>

feds/edugate/import.xml

@@ -53,6 +53,7 @@
             <list>
                 <ref bean="fetchEdugateExportAggregate"/>
                 <ref bean="checkEdugateSignature"/>
+                <ref bean="cleanImport"/>
                 <ref bean="disassemble"/>
                 <ref bean="checkSchemas"/>
                 <ref bean="assemble"/>