echosign combinedDocument api - node.js

Question

https://api.na1.echosign.com/api/rest/v5/agreements/{agreementId}/combinedDocument
I am trying to create a file from the body of the response, but it is creating a file that I can't open. It requires a password even though there isn't one on the file. I think this must have something to do with the encoding / decoding.
I am using a node express server. Here are the few lines of code I am using:
var request = require('request');
request({
baseUrl: 'https://api.na1.echosign.com/api/rest/v5',
url: '/agreements/' + req.params.id + '/combinedDocument',
headers: {'Access-Token': process.env.ECHOSIGN_INTEGRATIONKEY}
},
function(error, response, body){
if(error) {
res.send(error);
}
else {
var buf = new Buffer(body)
res.set({
'Content-Disposition': 'attachment; filename=test.pdf',
'Content-Type': 'application/pdf; charset=utf-8'
});
res.write(buf);
res.end();
}
}
);

Answer 1

This is what ended up working in the end in case somebody else stumbles across this. I think the problem was that the data being returned from the API is a stream and it needed to have the chunking logic and then get concatenated in order to avoid getting corrupted.
Also included is encoding to base64, pushing it into a database and then getting it back, decoding it and pushing it to the browser. I wasn't going to leave it like that, but had it set up that way to test the full cycle.
router.get('/echosign/agreement/:id', function(req, res) {
if (req.user !== 'myUserId') {
console.log(req.user);
res.redirect('/');
} else {
var request = require('request');
var data = [];
request({
baseUrl: 'https://api.na1.echosign.com/api/rest/v5',
url: '/agreements/' + req.params.id + '/combinedDocument',
headers: {'Access-Token': process.env.ECHOSIGN_INTEGRATIONKEY}
}).on('data', function(chunk){
data.push(chunk);
})
.on('end', function(){
data = Buffer.concat(data).toString('base64');
client.connect(function(err) {
if(err) {
return console.error('could not connect to postgres', err);
}
client.query("UPDATE agreements SET file = '" + data + "' WHERE agreementid = '" + req.params.id + "' RETURNING agreement, file", function(err, result) {
if(err) {
return console.log(result, err);
}
client.end();
res.set({
'Content-Type': 'application/pdf;charset=UTF-8',
'Content-Disposition': "inline; filename='" + result.rows[0].agreement.name + ".pdf'"
});
res.send(new Buffer(result.rows[0].file, 'base64'));
});
});
});
}
});