Convert cURL command to post request to send notification to kaa server - node.js

Question

I want to send a notification to kaa server. The below cURL command is working fine but I want to send POST request from my node.js server. Kindly help me in converting to post request.
curl -v -S -u devuser:devuser123 -F'notification=
{"applicationId":"32769","schemaId":"32778","topicId":"32770","type":"USER"};
type=application/json' -F file=#notification.json "http://localhost:8080/kaaAdmin/rest/api/sendNotification" | python -mjson.tool
I tried like this:
var notificationValue= {"applicationId":"32769","schemaId":"32778","topicId":"32770","type":"USER"};
var file = 'notification.json';
var opts = {
url: 'http://localhost:8080/kaaAdmin/rest/api/sendNotification',
method: 'POST',
auth: { user: 'devuser', password: 'devuser123' },
json: true,
formData: {
notification: JSON.stringify(notificationValue),
file : fs.readFileSync(file)
}
};
request(opts, function(err, resp, body) {
if(err)
res.send(err);
else{
res.send(body);
}
});
I am getting: Error 400 Required request part 'notification' is not present.

Answer 1

Here is a solution.
First import next modules.
var fs = require('fs');
var request = require('request');
var crypto = require('crypto');
We need two utility functions to generate boundary for multipart content type and the other to build raw POST request body.
var CRLF = "\r\n";
var md5 = crypto.createHash('md5');
function multipartRequestBodyBuilder(fields, boundary) {
var requestBody = '';
for(var name in fields) {
var field = fields[name];
var data = field.data;
var fileName = field.fileName ? '; filename="' + field.fileName + '"' : '';
var type = field.type ? 'Content-Type:' + field.type + CRLF : '';
requestBody += "--" + boundary + CRLF +
"Content-Disposition: form-data; name=\"" + name + "\"" + fileName + CRLF +
type + CRLF +
data + CRLF;
}
requestBody += '--' + boundary + '--' + CRLF
return requestBody;
}
function getBoundary() {
md5.update(new Date() + getRandomArbitrary(1, 65536));
return md5.digest('hex');
}
function getRandomArbitrary(min, max) {
return Math.random() * (max - min) + min;
}
Then we form our data and generate the boundary.
var notificationValue = {
"applicationId":"2",
"schemaId":"12",
"topicId":"1",
"type":"USER"
};
var postData = {
notification : {
data : JSON.stringify(notificationValue),
type : "application/json"
},
file : {
data : fs.readFileSync("message.json"),
fileName : 'notification.json',
type : 'application/octet-stream'
}
}
var boundary = getBoundary();
After that compose a request and send to Kaa Server.
var opts = {
url: 'http://localhost:8080/kaaAdmin/rest/api/sendNotification',
method: 'POST',
auth: { user: 'devuser', password: 'devuser123' },
headers: {
'content-type': 'multipart/form-data; boundary=' + boundary
},
body : multipartRequestBodyBuilder(postData, boundary)
};
request(opts, function(err, resp, body) {
if(err) {
console.log("Error: " + err);
} else {
console.log("Satus code: " + resp.statusCode + "\n");
console.log("Result: " + body);
}
});
After all, you will see the confirmation response with status code 200.
Status code: 200
Result: {
"id" : "57e42623c3fabb0799bb3279",
"applicationId" : "2",
"schemaId" : "12",
"topicId" : "1",
"nfVersion" : 2,
"lastTimeModify" : 1474569763797,
"type" : "USER",
"body" : "CkhlbGxvAA==",
"expiredAt" : 1475174563793,
"secNum" : 17
}
I attach the file with whole code that I tested on Notification Demo from Kaa sandbox: send notification.