Is it possible to create a QR code with Firebase?
I'd like to create a QR code for sharing pdf files with other people. It seems the Firebase has such functions but I couldn't figure it out where to generate the code...
Since Firebase ML-Kit was tagged I'm going to assume this question is specifically about Firebase ML-Kit. Firebase ML-Kit has a barcode scanning API but Firebase does not have a way to create/generate QR codes.
See Firebase ML-Kit:
https://firebase.google.com/docs/ml-kit/read-barcodes
Firebase integrates Google Cloud Functions and Cloud Storage. A straightforward way to generate a QR code could be writing a cloud function that takes the input of your call from Firebase, writes the QR code image to your Firebase connected cloud storage, and then returns the URI of the image.
Firebase Cloud Functions "provides a way to extend the behavior of Firebase and integrate Firebase features through the addition of server-side code."source
So, unlike GCP Cloud Functions that can be written in multiple languages, you typically will write Typescript or Javascript only on Firebase Functions.
Example QR Code Generation Code
Example Code for node.js
// index.js -> bundle.js
var QRCode = require('qrcode')
var canvas = document.getElementById('canvas')
QRCode.toCanvas(canvas, 'sample text', function (error) {
if (error) console.error(error)
console.log('success!');
})
Documentation References
npm QR Code Generator Package
Firebase Functions Getting Started Guide
Related
I'm looking for boilerplate snippets for both index.js and package.json to connect from my Node.js cloud function to Cloud Firestore database under the same project with a simple read/update request as example.
ps I'm using Cloud Functions inline editor.
Posting link from one of the comments that helped me.
Initialize Cloud Firestore
I am just start learning how to write fulfillment to read a data stored in the firebase as a first step.
Actually, I stored the same data in the firebase realtime database
and the firebase cloud database just to try from which one i must read my data, so I am just stuck how to retrieve it by the inline editor
My data is just a JSON object String names.
Note : form where i should start to learn Node.js for dialogflow fulfillment to do basic operation as storing and retrieving ?
You can use the firebase-admin library for node.js.
The inline editor is just Firebase Cloud Functions under the covers.
Your fulfillment code needs to run "somewhere" in the cloud - you'll need an HTTPS URL that you will provide, so this is called a "webhook". Firebase Cloud Functions are a convenient place to do this - they provide a HTTPS endpoint and good scalability, but you can run your fulfillment webhook anywhere on the public Internet.
Dialogflow provides an easy way to use Firebase Cloud Functions, by providing the inline code editor. This uses Firebase Cloud Functions to do the work, but hides the URL from you, so it is one fewer thing you need to deal with.
There are a number of good places to get started, but one is using Google's Codelabs for the Assistant make sure you also have looked at Google Docs for Actions on Google, which links to other resources as well.
I am trying to maintain connection status of user with firestore . but i don't understand some points.
Link : https://firebase.google.com/docs/firestore/solutions/presence
i refer the above link description but i don't understand how to write code.
see the below given topics:
Using presence in Realtime Database
where to write this given code in application or Cloud functions?
2.Connecting to Cloud Firestore
Updating Cloud Firestore's local cache
where to write local cache update code?
I use this in my android application.
Each section of the code in the Build Presence in Cloud Firestore is marked.
If it is marked with WEB, you'll need to run this code in your web application. If your clients are native Android or iOS, you'll need to write and run similar code for those platforms.
If the code is marked with NODE.JS, you will need to run this code in a Node.js environment. It should be possible to accomplish the same in Cloud Functions, but no sample is provided for that.
I want to send an HTTP Request from Android to a cloud function, post some values, then input these values into real time database.
index.js
const functions = require('firebase-functions');
exports.testPost = functions.https.onRequest((req, res) => {
console.log(req.body);
});
How can I accomplish this?
I see three steps in here:
Calling a Cloud Function from Android.
This is the same as calling any other HTTP URL from Android. See
Calling a Cloud Function from Android through Firebase
Parsing parameters from the call in your Cloud Function
A HTTP triggered Cloud Function is really just an Express handler. So parsing the post works the same as for other Express handlers. The Firebase documentation for HTTP functions has some examples and links to other documentation.
Posting to the database from a Cloud Functions
All the samples in the functions-samples repo include the Firebase Admin SDK. This SDK allows you to access many Firebase features, such as the database, from within your function. But there's also an example in this repo.
I want to save a file from Cloud Functions for Firebase to Firebase Storage.
I also want to read the file from Firebase Storage to Cloud Functions for Firebase at a later time.
I couldn't find any example for the same. Can someone help?
Cloud Functions run in a fairly standard V8 Node.js container. So you can use the regular Node SDK for Google Cloud Storage to interact with your files.
A snippet of code from the link:
// Upload a local file to a new file to be created in your bucket.
bucket.upload('/photos/zoo/zebra.jpg', function(err, file) {
if (!err) {
// "zebra.jpg" is now in your bucket.
}
});
But really: just go to the link, it contains a better example than I'm willing to copy/paste here.