File Uploads in GCF

readme.md

curl -F "hello_file=@hello.txt" https://us-central1-[YOUR-PROJECT].cloudfunctions.net/uploadFile

hello.txt

Hello World!

index.js

const path = require('path'),
os = require('os'),
fs = require('fs'),
Busboy = require('busboy');

exports.uploadFile = (req, res) => {
  if (req.method === 'POST') {
    const busboy = new Busboy({ headers: req.headers });
    let saveTo;
    busboy.on('file', function(fieldname, file, filename, encoding, mimetype) {
      // Note that os.tmpDir() is an in-memory file system, so should only 
      // be used for files small enough to fit in memory      
      saveTo = path.join(os.tmpDir(), path.basename(fieldname));
      file.pipe(fs.createWriteStream(saveTo));
    });

    busboy.on('finish', function() {
      // Read the file back to make sure it was written
      fs.readFile(saveTo, 'utf8', function(err, data) {
        if (err)  {
          console.error(err);
          res.status(500).send(err);
          return;
        }
        res.send(`Upload Complete: ${data}`);
      });      
    });

    // The raw bytes of the upload will be in req.rawBody
    busboy.end(req.rawBody);
  } else {
    // Only support POST
    res.status(405).end();
  }
}

package.json

{
  "name": "upload",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "deploy": "gcloud beta functions deploy uploadFile --stage-bucket gcf-stage --trigger-http"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "busboy": "^0.2.14"
  }
}