从 cognito 获取令牌并在 wso2 Enterprise Intigrator 中缓存

Question

I need to get a token from Cognito but I don't know how to get it through enterprise integrator. I have client_id and client_secet and endpoint also. But I 'm not able to get the token seems I'm not calling the endpoint properly with proper parameter.

After getting the token I need to cache it till the token expires so I don't have to call again and again

here is the code I'm trying

<cache id="cache-sample" scope="per-host" collector="false" hashGenerator="org.wso2.carbon.mediator.cache.digest.DOMHASHGenerator" timeout="5000">
    <implementation type="memory" maxSize="1000"/>
</cache>
<header name="client_id" scope="transport" value="XXXXXXXXXXXXXXXXX"/>
<header name="client_secret" scope="transport" value="XXXXXXXXXXXXXXXXXXX"/>
<header name="Content-Type" scope="transport" value="application/json"/>
<property name="DISABLE_CHUNKING" scope="axis2" type="STRING" value="true"/>
<call>
    <endpoint>
       <address uri="https://xcxxxxxxxxxx.auth.us-east-1.amazoncognito.com/oauth2/token"/>
    </endpoint>
</call>
<property name="RESPONSE" value="true" scope="default" type="STRING"/>
<cache scope="per-host" collector="true"/>
<respond/>

Answer 1

<?xml version="1.0" encoding="UTF-8"?>
<api context="/api/myService" name="myService-api" xmlns="http://ws.apache.org/ns/synapse">
    <resource methods="POST" uri-template="/getToken">
        <inSequence>
            <script language="js"><![CDATA[var payload = mc.getPayloadXML();
                var log = mc.getServiceLog();
                var client_id = payload..*::client_id.toString();
                var client_secret = payload..*::client_secret.toString();
                mc.setProperty("client_id", client_id);
                mc.setProperty("client_secret", client_secret);]]>
            </script>
            <payloadFactory media-type="json">
                <format/>
                <args/>
            </payloadFactory>
            <property name="ContentType" scope="axis2" type="STRING" value="application/x-www-form-urlencoded"/>
            <property expression="fn:concat($ctx:client_id,':',$ctx:client_secret)" name="credentials" scope="default" type="STRING"/>
            <property expression="fn:concat('Basic ', base64Encode($ctx:credentials))" name="Authorization" scope="transport" type="STRING" xmlns:ns="http://org.apache.synapse/xsd"/>
            <property name="FORCE_POST_PUT_NOBODY" scope="axis2" type="BOOLEAN" value="true"/>
            <property name="DISABLE_CHUNKING" scope="axis2" type="STRING" value="true"/>
            <cache 
                collector="false" 
                hashGenerator="org.wso2.carbon.mediator.cache.digest.DOMHASHGenerator" 
                id="cognito-token" 
                scope="per-host" 
                timeout="3600">
                <onCacheHit>
                    <log level="custom">
                        <property expression="/" name="[usage-service-api]:: CHACHE HIT"/>
                    </log>
                    <respond/>
                </onCacheHit>
                <implementation maxSize="50" type="memory"/>
            </cache>
            <call>
                <endpoint>
                    <http method="post" uri-template="https://xxxxxxxxxxx.amazoncognito.com/oauth2/token?grant_type=client_credentials"/>
                </endpoint>
            </call>
            <property name="RESPONSE" scope="default" type="STRING" value="true"/>
            <cache collector="true" id="cognito-token" scope="per-host"/>
            <respond/>
        </inSequence>
        <outSequence/>
        <faultSequence/>
    </resource>
</api>

For first Call cache miss will happen in that case it will call the endpoint and store it in the cache for the second call and onwards till the time expires for the same call it will hit the cache ie Cache hit then It will respond from onCacheHit mediator

<onCacheHit>
    <respond/>
</onCacheHit>

and

But after cache hit it will skip any execution of any statement written after cache Mediator. So So keep it in some other sequence if you are writing in some sequence You can have more than one resources in API.

If you want to know how to call this API then see this getting cognito acces_token with wso2 esb

<log level="custom">
    <property expression="/" name="[usage-service-api]:: CHACHE HIT"/>
</log>

The above block of code logs the content of the cache on CACHE HIT