index.js

const functions = require('firebase-functions');
const cors = require('cors')({ origin: true });
const Busboy = require('busboy');
const os = require('os');
const path = require('path');
const fs = require('fs');
const uuid = require('uuid/v4');
const fbAdmin = require('firebase-admin');

const { Storage } = require('@google-cloud/storage');

const storage = new Storage({
	projectId: 'ionic-maps-api-1565705298126',
});

fbAdmin.initializeApp({
	credential: fbAdmin.credential.cert(require('')),
});

exports.storeImage = functions.https.onRequest((req, res) => {
	return cors(req, res, () => {
		if (req.method !== 'POST') {
			return res.status(500).json({ message: 'Not allowed.' });
		}

		if (
			!req.headers.authorization ||
			!req.headers.authorization.startsWith('Bearer ')
		) {
			return res.status(401).json({ error: 'Unauthorized!' });
		}

		let idToken;
		idToken = req.headers.authorization.split('Bearer ')[1];

		const busboy = new Busboy({ headers: req.headers });
		let uploadData;
		let oldImagePath;

		busboy.on('file', (fieldname, file, filename, encoding, mimetype) => {
			const filePath = path.join(os.tmpdir(), filename);
			uploadData = { filePath: filePath, type: mimetype, name: filename };
			file.pipe(fs.createWriteStream(filePath));
		});

		busboy.on('field', (fieldname, value) => {
			oldImagePath = decodeURIComponent(value);
		});

		busboy.on('finish', () => {
			const id = uuid();
			let imagePath = 'images/' + id + '-' + uploadData.name;
			if (oldImagePath) {
				imagePath = oldImagePath;
			}

			return fbAdmin
				.auth()
				.verifyIdToken(idToken)
				.then((decodedToken) => {
					console.log(uploadData.type);
					return storage
						.bucket('ionic-maps-api-1565705298126.appspot.com')
						.upload(uploadData.filePath, {
							uploadType: 'media',
							destination: imagePath,
							metadata: {
								metadata: {
									contentType: uploadData.type,
									firebaseStorageDownloadTokens: id,
								},
							},
						});
				})
				.then(() => {
					return res.status(201).json({
						imageUrl:
							'https://firebasestorage.googleapis.com/v0/b/' +
							storage.bucket('ionic-maps-api-1565705298126.appspot.com').name +
							'/o/' +
							encodeURIComponent(imagePath) +
							'?alt=media&token=' +
							id,
						imagePath: imagePath,
					});
				})
				.catch((error) => {
					console.log(error);
					return res.status(401).json({ error: 'Unauthorized!' });
				});
		});
		return busboy.end(req.rawBody);
	});
});