How to extract http headers using a mediator - wso2

Question

How do I extract http headers like
Authorization: ​"admin 0PN5J17HBGZHT7JJ3X82"
where admin is the username and 0PN5J17HBGZHT7JJ3X82 is the password and assign it to a property/variable which would be then passed to a dss service for user login verification. From what I know our API can be do this using custom sequences and mediators (https://docs.wso2.com/display/AM170/Adding+Mediation+Extensions) but its not clear tome on how to extract this header and assign it to different property names like login and password.
Does a mediator header can take care of this? Or this there another way of doing by using a proxy service?
Header Mediator
<in>
<header name="Authorization" value="admin 0PN5J17HBGZHT7JJ3X82" scope="transport"/>
<send>
<endpoint name="people">
<address uri="http://localhost:9443/testapi/" format="get"/>
</endpoint>
</send>
</in>
<out>
<send/>
</out>
Proxy Service
<proxy name="adminServiceProxy" transports="https http"
startOnLoad="true" trace="disable">
<description/>
<target>
<endpoint>
<address uri="https://localhost:9443/testapi"/>
</endpoint>
<inSequence>
<property name="Authorization"
expression="fn:concat('Basic ','admin:0PN5J17HBGZHT7JJ3X82')"
scope="transport"/>
</inSequence>
<outSequence>
<send/>
</outSequence>
</target>
</proxy>
Thank you

Answer 1

You can extract like this;
<property name="AuthHeader" expression="$trp:Authorization"/>
Then log it and see what you are retrieving..
<log>
<property name =" Authheder value" expression=get-property('AuthHeader')/>
</log>
Then construct Basic auth header as you pointed in your proxy configuration.
Here is a blog post which explains how you can retrive various information from a sequence