Smooch - create attachments from buffer - node.js

Question

I'm trying to create an image via smooch-core API
I have an image as Buffer - base64, And I try something like this:
smoochClient.attachments
.create({
appId: appId,
props: {
for: 'message',
access: 'public',
appUserId: appUserId
},
source: myBuffer
})
.then(() => {
console.log('OK');
}).catch(err => {
console.log(JSON.stringify(err));
});
I get this error: "status":413,"statusText":"Payload Too Large"
[When I create this image normally through Postman it does work well, so it's not too big - I guess it's because of the Buffer's sending]
Anyone know how I can send a buffer to this API?

Answer 1

Are you able to submit the base64 data directly in the postman call?
Reading through the spec here it looks like source should be a filepath/name, and not raw binary data.
The easy way may be to save the base64 data to a[n appropriately encoded] file, then provide that file's path as source
Otherwise I'm not sure I'd go so far as to take apart api_instance.upload_attachment() to feed in the base64 data instead of opening/reading from the specified filename.

Answer 2

I found such a solution:
Create a temporary file to get it's read stream and send it in source instead of the myBuffer parameter and here is the code of creating the temporary file:
async getTempFileSource(bufferData) {
const fs = require("fs");
//remove mime type
if (bufferData.startsWith('data:'))
bufferData = bufferData.split('base64,')[1];
//Get file extension
const type = await require('file-type').fromBuffer(new Buffer(bufferData, 'base64'));
if (!type) {
console.log("getTempFileSource - The buffer data is corrupted", 'red');
return null;
}
//create temporary file
const tempFile = require('tmp').fileSync({postfix: '.' + type.ext});
//append buffer data to temp file
fs.appendFileSync(tempFile.name, new Buffer(bufferData, 'base64'));
//create read stream from the temp file
const source = fs.createReadStream(tempFile.name);
//remove the temp file
tempFile.removeCallback();
return source;
}
Here is the code for creating the attachment:
return new Promise(async (resolve, reject) => {
const source = await getTempFileSource(bufferData);
if (!source)
resolve(null);
else {
session.smoochClient.attachments
.create({
appId: appId,
props: {
for: 'message',
access: 'public',
appUserId: appUserId
},
source: source
})
.then(res => {
resolve(res);
}).catch(err => {
reject(err);
});
}
});