Is there a way to modify/add metadata fields to an object uploaded to Firestore Storage in the onFinalize trigger function? There is documentation on how to perform this operation on the client side but not on the server side.
There is plenty of documentation for the server side libraries. If you're deploying code to Cloud Functions using the Firebase CLI, that means you're probably using the Cloud Storage node SDK. The API documentation for that is here, and the general documentation is here. In the general documentation there are even plenty of examples to get you started. One of the samples is called "storage set file metadata".
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I have a desktop app that will be distributed to users, and part of its code (which the user might be able to access) has to perform an API call to a third-party web service. However, this requires the API keys to be embedded into the source code, which causes some obvious security issues.
The main solution I've found while researching on the subject is to have a backend server between the user and the third-party API endpoint. So, I've been looking into Firebase for a while and it seems that this solution can be implemented using Firestore and Cloud Functions.
But, I wasn't able to find any clear examples that achieve something like this, and since I have no previous experience with Firebase or just backend programming in general, I would like to know if I'm on the right track and get more details about how to get it done, or if there are better alternatives for solving this issue. Any input is appreciated, thx.
You can use the firebase cloud functions as you mentioned. Your desktop application will be communicating with the cloud function - simple API call. Here you can find examples how to implement and deploy functions and test it locally https://firebase.google.com/docs/functions/get-started. Your cloud function will hold the API keys (it is backend so it will be secure if you dont expose it explicitly. Also the backend to backend communication is considered as secure). Finally, this cloud function will call the third party service and return some data back to the desktop app if needed. So you are on the right track, that is how the design should look like. If you need some help with cloud functions, you can also contact me directly.
I need to load some image files from Cloud Storage. For a given folder I need to check what images (if at all) are available in it. It seems like the firebase client library (https://pub.dev/packages/firebase_storage) doesn't have a simple way of doing that. I am sure ios/android clients have ref().list() command. Is there any way to do that easily in Flutter or I have to write a bridge to native methods?
The methods to list files in Cloud Storage were only recently added to the Firebase SDKs, so it seems likely that they haven't been ported to the FlutterFire library yet.
You'll indeed either have to implement the interop yourself (in which case a PR back to the repo is highly appreciated), or wait for someone else to implement this feature request.
A final alternative is to not depend on this (relatively new) API, and store the list of file paths/download URLs in another data store, such as the Firebase Realtime Database, or 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.
In times when Parse.com was on they had a function that called a cloud function directly and returned whatever I wanted. So I could have all the server logic on the server, not in client code. Doe's Firebase has it as well? I can't find it - all I found are HTTP triggers, but it implies that it's not available through Javascript SDK. Am I missing something or do I have to use REST interface for that?
To run server-side code that is triggered by events in Firebase, you'd use Cloud Functions for Firebase. Currently these can trigger code through the Firebase Database updates, Authentication, Analytics, Cloud Storage and HTTP. The documentation I linked has all the details.
As Frank van Puffelen has explained you could use Functions, I'll like to add a couple of things.
You could also use the Firebase Database Admin SDK for the Database, this requires you have a server
Firebase Functions is a sort of big brother, constantly listening for whatever you want. Currently starting and deploying functions is fairly easy and fast, I love this how to video. Basically, you have to install the CLI and then using commands, create a project, write your js for Functions and for deploying those changes to Firebase Functions use the CLI again
Functions can listen more than what the Admin SDK can, the Admin SDK is for the Database while Functions is for, authentification, database, and cloud messaging. This means any user registration or deletion or any change in a node, can trigger further logic. This logic could include sending push notifications. There is a github repo where you can see a lot of examples, I made myself a small repo for the same purpose