This is a sample WSO2 ESB proxy service to move a file from SFTP server to an Amazon S3 bucket

vfsProxyS3.xml

<?xml version="1.0" encoding="UTF-8"?><proxy xmlns="http://ws.apache.org/ns/synapse" name="vfsProxyS3" startOnLoad="true" statistics="disable" trace="disable" transports="vfs">
    <target>
        <inSequence>
            <log level="full">
                <property name="log" value="====VFS Proxy S3===="/>
            </log>
            <property expression="get-property('SYSTEM_TIME')" name="objectName"/>
            <property name="contentType" value="text/plain"/>
            <amazons3.init>
                <accessKeyId>{wso2:vault-lookup('s3accesskey')}</accessKeyId>
                <secretAccessKey>{wso2:vault-lookup('s3secretkey')}</secretAccessKey>
                <bucketName>csrf-sftp-poc</bucketName>
                <isXAmzDate>true</isXAmzDate>
                <methodType>PUT</methodType>
                <contentType>{$ctx:contentType}</contentType>
                <region>us-east-2</region>
                <host>s3.us-east-2.amazonaws.com</host>
            </amazons3.init>
            <amazons3.createObject>
                <bucketUrl>https://s3.us-east-2.amazonaws.com/csrf-sftp-poc</bucketUrl>
                <objectName>{$ctx:objectName}</objectName>
            </amazons3.createObject>
            <log level="full"/>
            <drop/>
        </inSequence>
        <outSequence/>
        <faultSequence/>
    </target>
    <parameter name="transport.PollInterval">15</parameter>
    <parameter name="transport.vfs.MaxRetryCount">1</parameter>
    <parameter name="transport.vfs.FileURI">vfs:sftp://sftpuser:sftppass@localhost/sftpuser/test/in</parameter>
    <parameter name="transport.vfs.ContentType">text/plain</parameter>
    <parameter name="transport.vfs.ActionAfterProcess">MOVE</parameter>
    <parameter name="transport.vfs.MoveAfterFailure">vfs:sftp://sftpuser:sftppass@localhost/sftpuser/test/failed</parameter>
    <parameter name="transport.vfs.ActionAfterFailure">MOVE</parameter>
    <parameter name="transport.vfs.FileNamePattern">.*.xml</parameter>
    <parameter name="transport.vfs.MoveAfterProcess">vfs:sftp://sftpuser:sftppass@localhost/sftpuser/test/out</parameter>
    <description/>
</proxy>