How to consume MTOM SOAP web service in node.js? - node.js

Question

I need to download or process a file from a soap based web service in node.js.
can someone suggest me on how to handle this in node.js
I tried with 'node-soap' or 'soap' NPM module. it worked for normal soap web service. But, not for binary steam or MTOM based SOAP web service

Answer 1

I want to try to answer this... It's quite interesting that 2 years and 2 months later I can not figure it out how to easily solve the same problem.
I'm trying to get the attachment from a response like:
...
headers: { 'cache-control': 'no-cache="set-cookie"',
'content-type': 'multipart/related;boundary="----=_Part_61_425861994.1525782562904";type="application/xop+xml";start="";start-info="text/xml"',
...
body: '------=_Part_61_425861994.1525782562904\r\nContent-Type:
application/xop+xml; charset=utf-8;
type="text/xml"\r\nContent-Transfer-Encoding: 8bit\r\nContent-ID:
\r\n\r\n....\r\n------=_Part_61_425861994.1525782562904\r\nContent-Type:
application/octet-stream\r\nContent-Transfer-Encoding:
binary\r\nContent-ID:
\r\n\r\n�PNG\r\n\u001a\n\u0000\u0000\u0000\rIHDR\u0000\u0000\u0002,\u0000\u0000\u0005�\b\u0006\u0........binary....
I tried ws.js but no solution.
My solution:
var request = require("request");
var bsplit = require('buffer-split')
// it will extract "----=_Part_61_425861994.1525782562904" from the response
function getBoundaryFromResponse(response) {
var contentType = response.headers['content-type']
if (contentType && contentType.indexOf('boundary=') != -1 ) {
return contentType.split(';')[1].replace('boundary=','').slice(1, -1)
}
return null
}
function splitBufferWithPattern(binaryData, boundary) {
var b = new Buffer(binaryData),
delim = new Buffer(boundary),
result = bsplit(b, delim);
return result
}
var options = {
method: 'POST',
url: 'http://bla.blabal.../file',
gzip: true,
headers: {
SOAPAction: 'downloadFile',
'Content-Type': 'text/xml;charset=UTF-8'
},
body: '<soapenv: ... xml request of the file ... elope>'
};
var data = [];
var buffer = null;
var filename = "test.png"
request(options, function (error, response, body) {
if (error) throw new Error(error);
if (filename && buffer) {
console.log("filename: " + filename)
console.log(buffer.toString('base64'))
// after this, we can save the file from base64 ...
}
})
.on('data', function (chunk) {
data.push(chunk)
})
.on('end', function () {
var onlyPayload = splitBufferWithPattern(Buffer.concat(data), '\r\n\r\n') // this will get from PNG
buffer = onlyPayload[2]
buffer = splitBufferWithPattern(buffer, '\r\n-')[0]
console.log('Downloaded.');
})
I am not sure it will works in most of the cases. It looks like unstable code to my eyes and so I'm looking for something better.

Answer 2

Use ws.js
Here is how to fetch the file attachments:
const ws = require('ws.js')
const { Http, Mtom } = ws
var handlers = [ new Mtom(), new Http()];
var request = '<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope">' +
'<s:Body>' +
'<EchoFiles xmlns="http://tempuri.org/">' +
'<File1 />' +
'</EchoFiles>' +
'</s:Body>' +
'</s:Envelope>'
var ctx = { request: request
, contentType: "application/soap+xml"
, url: "http://localhost:7171/Service/mtom"
, action: "http://tempuri.org/IService/EchoFiles"
}
ws.send(handlers, ctx, function(ctx) {
//read an attachment from the soap response
var file = ws.getAttachment(ctx, "response", "//*[local-name(.)='File1']")
// work with the file
fs.writeFileSync("result.jpg", file)
})
Two limitations:
No basic auth provided out-of-box, patch required https://github.com/yaronn/ws.js/pull/40
If the file name is an url, you need to apply another patch at mtom.js. Replace:
.
xpath = "//*[#href='cid:" + encodeURIComponent(id) + "']//parent::*"
with:
xpath = "//*[#href='cid:" + id + "']//parent::*"