How to convert xml formatted authentication faliure error into JSON errors in WSO2 API manager

For this we need to add additional sequence which convert message into JSON. Then we need to add that sequence to auth failure sequence so authentication faliure message will be convert and sent to client.

Add convert sequence to _auth_failure_handler_

 

<sequence name="_auth_failure_handler_" xmlns="http://ws.apache.org/ns/synapse">
    <sequence key="convert"/>
</sequence>

convert sequence

<sequence xmlns="http://ws.apache.org/ns/synapse" name="convert">
<sequence key="_build_"/>
<filter source="get-property('MESSAGE_FORMAT')" regex="soap1[1-2]">
<then>
<property name="SOAP_FAULT_CODE" value="Server"/>
<makefault>
<code expression="$ctx:SOAP_FAULT_CODE"/>
<reason expression="$ctx:ERROR_MESSAGE"/>
</makefault>
</then>
<else>
<payloadFactory>
<format>
<am:fault xmlns:am="http://wso2.org/apimanager">
<am:code>$1</am:code>
<am:type>Status report</am:type>
<am:message>Runtime Error</am:message>
<am:description>$2</am:description>
</am:fault>
</format>
<args>
<arg expression="$ctx:ERROR_CODE"/>
<arg expression="$ctx:ERROR_MESSAGE"/>
</args>
</payloadFactory>
<filter source="$axis2:HTTP_METHOD" regex="^(?!.*(POST|PUT)).*$"></filter>
</else>
</filter>
<filter xpath="$ctx:CUSTOM_HTTP_SC">
<then>
<property name="HTTP_SC" expression="$ctx:CUSTOM_HTTP_SC" scope="axis2"/>
</then>
<else>
<property name="HTTP_SC" value="500" scope="axis2"/>
</else>
</filter>
<class name="org.wso2.carbon.apimgt.usage.publisher.APIMgtFaultHandler"/>
<property name="RESPONSE" value="true"/>
<header name="To" action="remove"/>
<property name="NO_ENTITY_BODY" scope="axis2" action="remove"/>
<property name="ContentType" scope="axis2" action="remove"/>
<property name="Authorization" scope="transport" action="remove"/>
<property name="Host" scope="transport" action="remove"/>
<property name="Accept" scope="transport" action="remove"/>
<property name="X-JWT-Assertion" scope="transport" action="remove"/>
<property name="messageType" value="application/json" scope="axis2"/>
<send/>
</sequence>