Why WSO2 ESB is Encoding Email Attachment in Base64 - wso2

Question

My proxy service receiving email from Gmail IMAP server. Email has csv file attachment as well. WSO2 ESB received the email successfully but in the logs attachment content is printed as base64 encoded string. Below are my axis2.xml connfigs.
<!-- ================================================= -->
<!-- Message Formatters -->
<!-- ================================================= -->
<!-- Following content type to message formatter mapping can be used to implement support -->
<!-- for different message format serializations in Axis2. These message formats are -->
<!-- expected to be resolved based on the content type. -->
<messageFormatters>
<messageFormatter contentType="application/x-www-form-urlencoded"
class="org.apache.synapse.commons.formatters.XFormURLEncodedFormatter"/>
<messageFormatter contentType="multipart/form-data"
class="org.apache.axis2.transport.http.MultipartFormDataFormatter"/>
<messageFormatter contentType="application/xml"
class="org.apache.axis2.transport.http.ApplicationXMLFormatter"/>
<messageFormatter contentType="text/xml"
class="org.apache.axis2.transport.http.SOAPMessageFormatter"/>
<messageFormatter contentType="application/soap+xml"
class="org.apache.axis2.transport.http.SOAPMessageFormatter"/>
<messageFormatter contentType="text/plain"
class="org.apache.axis2.format.PlainTextFormatter"/>
<messageformatter contenttype="text/csv" class="org.apache.axis2.format.PlainTextFormatter"/>
<!--JSON Message Formatters-->
<messageFormatter contentType="application/json"
class="org.apache.synapse.commons.json.JsonStreamFormatter"/>
<!--messageFormatter contentType="application/x-www-form-urlencoded"
class="org.wso2.carbon.relay.ExpandingMessageFormatter"/-->
<!--messageFormatter contentType="multipart/form-data"
class="org.wso2.carbon.relay.ExpandingMessageFormatter"/-->
<messageFormatter contentType="application/xml"
class="org.wso2.carbon.relay.ExpandingMessageFormatter"/>
<!--messageFormatter contentType="text/html"
class="org.wso2.carbon.relay.ExpandingMessageFormatter"/-->
<!--messageFormatter contentType="application/soap+xml"
class="org.wso2.carbon.relay.ExpandingMessageFormatter"/-->
<messageFormatter contentType="text/xml"
class="org.wso2.carbon.relay.ExpandingMessageFormatter"/>
<!--messageFormatter contentType="x-application/hessian"
class="org.apache.synapse.format.hessian.HessianMessageFormatter"/-->
<!--messageFormatter contentType=""
class="org.apache.synapse.format.hessian.HessianMessageFormatter"/-->
<!--messageFormatter contentType="application/edi-hl7"
class="org.wso2.carbon.business.messaging.hl7.message.HL7MessageFormatter"/-->
</messageFormatters>
<!-- ================================================= -->
<!-- Message Builders -->
<!-- ================================================= -->
<!-- Following content type to builder mapping can be used to implement support for -->
<!-- different message formats in Axis2. These message formats are expected to be -->
<!-- resolved based on the content type. -->
<messageBuilders>
<messageBuilder contentType="application/xml"
class="org.apache.axis2.builder.ApplicationXMLBuilder"/>
<messageBuilder contentType="application/x-www-form-urlencoded"
class="org.apache.synapse.commons.builders.XFormURLEncodedBuilder"/>
<messageBuilder contentType="multipart/form-data"
class="org.apache.axis2.builder.MultipartFormDataBuilder"/>
<messageBuilder contentType="text/plain"
class="org.apache.axis2.format.PlainTextBuilder"/>
<!--JSON Message Builders-->
<messagebuilder contenttype="text/csv" class="org.apache.axis2.format.PlainTextBuilder"/>
<messageBuilder contentType="application/json"
class="org.apache.synapse.commons.json.JsonStreamBuilder"/>
<messageBuilder contentType="application/xml"
class="org.wso2.carbon.relay.BinaryRelayBuilder"/>
<!--messageBuilder contentType="application/x-www-form-urlencoded"
class="org.wso2.carbon.relay.BinaryRelayBuilder"/-->
<!--messageBuilder contentType="multipart/form-data"
class="org.wso2.carbon.relay.BinaryRelayBuilder"/-->
<messageBuilder contentType="multipart/related"
class="org.wso2.carbon.relay.BinaryRelayBuilder"/>
<!--<messageBuilder contentType="multipart/related" class="org.apache.axis2.builder.MIMEBuilder"/>-->
<!--messageBuilder contentType="application/soap+xml"
class="org.wso2.carbon.relay.BinaryRelayBuilder"/-->
<messageBuilder contentType="text/plain"
class="org.wso2.carbon.relay.BinaryRelayBuilder"/>
<messageBuilder contentType="text/xml"
class="org.wso2.carbon.relay.BinaryRelayBuilder"/>
<!--messageBuilder contentType="x-application/hessian"
class="org.apache.synapse.format.hessian.HessianMessageBuilder"/-->
<!--messageBuilder contentType=""
class="org.apache.synapse.format.hessian.HessianMessageBuilder"/-->
<!--messageBuilder contentType="application/edi-hl7"
class="org.wso2.carbon.business.messaging.hl7.message.HL7MessageBuilder"/-->
</messageBuilders>
Log:
INFO - LogMediator To: /services/MailService MessageID: urn:uuid:492da964-ee6c-4ae7-b444-269ba8a52641 Direction: request%%%%%%%%%%%%Envelope: <?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><soapenv:Envelope xmlns:soapenv="http://www.w3.org/2003/05/soap-envelope"><soapenv:Body><ns:binary xmlns:ns="http://ws.apache.org/commons/ns/payload">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</ns:binary></soapenv:Body></soapenv:Envelope></soapenv:Body></soapenv:Envelope>
[2017-03-22 11:16:46,049] DEBUG - RelayUtils Content Type is multipart/mixed; boundary=94eb2c1432baf6e77a054b4bb379
Proxy Code:
<proxy xmlns="http://ws.apache.org/ns/synapse"
name="MailTransportProtocolIMAP"
startOnLoad="true"
statistics="disable"
trace="disable"
transports="mailto">
<target>
<inSequence>
<log level="full" separator="---=== Invalid Subject ===---"/>
</inSequence>
<outSequence/>
</target>
<parameter name="mail.imap.starttls.enable">false</parameter>
<parameter name="mail.imap.socketFactory.port">993</parameter>
<parameter name="transport.mail.Address">mapperxslt1#gmail.com</parameter>
<parameter name="mail.imap.fetchsize">100000</parameter>
<parameter name="mail.imap.user">mapperxslt1</parameter>
<parameter name="mail.imap.password">Password</parameter>
<parameter name="transport.mail.ActionAfterProcess">MOVE</parameter>
<parameter name="mail.imap.host">imap.gmail.com</parameter>
<parameter name="transport.mail.ContentType">multipart/mixed</parameter>
<parameter name="transport.mail.MoveAfterProcess">Processed</parameter>
<parameter name="mail.imap.port">993</parameter>
<parameter name="transport.PollInterval">5</parameter>
<parameter name="transport.mail.Protocol">imap</parameter>
<parameter name="transport.mail.Folder">inbox</parameter>
<parameter name="mail.imap.socketFactory.class">javax.net.ssl.SSLSocketFactory</parameter>
<parameter name="mail.imap.ssl.enable">false</parameter>
<parameter name="mail.imap.socketFactory.fallback">false</parameter>
<description/>
</proxy>
Is there any way in WSO2 ESB to save the attachment as it is in the directory? Any help would be great favor.

Answer 1

You can access the content inside request/response payload of csv by registering "org.apache.axis2.format.PlainTextBuilder" and "org.apache.axis2.format.PlainTextFormatter" as message builder and formatter for text/csv content-type.
Please add the following formatters and builders to axis2.xml. please check builder.
<messageformatter contenttype="text/csv" class="org.apache.axis2.format.PlainTextFormatter"/>
<messagebuilder contenttype="text/csv" class="org.apache.axis2.format.PlainTextBuilder"/>