Delete a S3 file using WSO2 ESB S3 connector - amazon-s3

Question

I am running into issues while trying to delete a file that resides in Amazon S3 using the WSO2 ESB connector. Here is what I have done:
1) Created a proxy service in WSO2 ESB using the following taken from the WSO2 documentation :
2) I made sure that the proxy service is deployed to WSO2 then using POSTMAN
3) I submitted the following to POSTMAN:
<deleteObject>
<accessKeyId>MYACCESSKEY</accessKeyId>
<secretAccessKey>MYSECRETKEY</secretAccessKey>
<methodType>DELETE</methodType>
<contentType>application/xml</contentType>
<expect>100-continue</expect>
<region>us-east-1</region>
<host>s3.amazonaws.com</host>
<bucketUrl>http://s3.amazonaws.com/MYBUCKET</bucketUrl>
<bucketName>MYBUCKET</bucketName>
<isXAmzDate>true</isXAmzDate>
<objectName>FILETODELETE.txt</objectName>
<versionId></versionId>
</deleteObject>
I get the following error message (beginning of message):
<?xml version="1.0" encoding="UTF-8"?>
<Error>
<Code>SignatureDoesNotMatch</Code>
<Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message>
<AWSAccessKeyId>MYACCESSKEY</AWSAccessKeyId>
<StringToSign>AWS4-HMAC-SHA256
Sat, 07 Jul 2018 15:25:18 GMT
20180707/us-east-1/s3/aws4_request
618b0c822492e3dd2a8f4d9e1ea</StringToSign> <SignatureProvided>06b2b268cb90b69a1c5dadbb689ed4ccf7b459ff1b5</SignatureProvided>
<StringToSignBytes>BUNCH OF NUMBERS</StringToSignBytes>
<CanonicalRequest>DELETE
/MYBUCKET/xxxxx.txt/
content-type:application/xml
host:s3.amazonaws.com
x-amz-content-sha256:UNSIGNED-PAYLOAD
x-amz-date:Sat, 07 Jul 2018 15:25:18 GMT
content-type;host;x-amz-content-sha256;x-amz-date
UNSIGNED-PAYLOAD</CanonicalRequest>
<CanonicalRequestBytes>BUNCH OF NUMBERS</CanonicalRequestBytes>
<RequestId>SOODEDIBD</RequestId>
<HostId>vLllBSaWMHkV+gqX6yh7+43WK4PsAO4VVXLdGePBvGWZtxxExbBqI=</HostId>
I recreated my S3 credentials, but I am still running into the same error, any help will be greatly appreciated.
Frank

Answer 1

After going through delete object for S3, you need to check if the header values are going proper or not, as there is authentication required before accessing the web service , The header should look something like this .
DELETE /my-image.jpg?versionId=3HL4kqCxf3vjVBH40Nrjfkd HTTPS/1.1
Host: bucketName.s3.amazonaws.com
x-amz-mfa: 20899872 301749
Date: Wed, 28 Oct 2009 22:32:00 GMT
Authorization: AWS AKIAIOSFODNN7EXAMPLE:0RQf4/cRonhpaBX5sCYVf1bNRuU=
You can put wso2 esb on debug mode and confirm where proper header is being passed or not, else take a TCPDUMP to be accurate