How to implement file upload API in WSO2 ESB? - wso2

Question

i was trying out file upload program , i get exception in script mediator while setting binay = true . following is code
<?xml version="1.0" encoding="UTF-8"?>
<api context="/v1/document" name="DocUpload" xmlns="http://ws.apache.org/ns/synapse">
<resource methods="POST" url-mapping="/upload">
<inSequence>
<log level="full"/>
<property expression="json-eval($.fileName)" name="fileName" scope="default" type="STRING"/>
<property expression="json-eval($.fileContent)" name="fileContent" scope="default" type="STRING"/>
<payloadFactory media-type="xml">
<format>
<ns:binary xmlns:ns="http://ws.apache.org/commons/ns/payload">$1</ns:binary>
</format>
<args>
<arg evaluator="xml" expression="$body/attachments/content"/>
</args>
</payloadFactory>
<script language="js"><![CDATA[var binaryNode =
mc.getEnvelope().getBody().getFirstElement().getFirstOMChild();
binaryNode.setBinary(true);]]></script>
<log level="full">
<property expression="$ctx:fileName" name="fileName"/>
</log>
Exception as follows
"fileContent": "Base64 IMAGECONTENT"}/request/mediate/soapenv:Body/soapenv:Envelope
[2020-07-03 17:48:21,346] ERROR {org.apache.synapse.mediators.bsf.ScriptMediator} - The script engine returned an error executing the inlined js script function mediate com.sun.phobos.script.util.ExtendedScriptException: org.mozilla.javascript.EcmaError: TypeError: Cannot call method "setBinary" of null (Unknown Source#3) in Unknown Source at line number 3
I have upload the file using POSTMAN , by calling API as shown below
, Any help appreciated

Answer 1

It seems that you are sending the message body as a header in the postman (request {
"fileName":"imageNew2.png",
"fileContent": "Base64 IMAGECONTENT"
})
Instead of this please try to send the request payload as the body (use a POST request).
If you are interested in working with files please refer to the VFS transport and also the file connector operation in 1, [2].
[1] -https://docs.wso2.com/display/ESB500/VFS+Transport
[2]-https://docs.wso2.com/display/ESBCONNECTORS/File+Connector