This quickstart demonstrates using Firebase SDK for Cloud Functions setup with a Cloud Storage trigger.
This sample automatically generates thumbnails for images that are uploaded to Cloud Storage.
See file functions/index.js for the thumbnail generation code.
The thumbnail generation is performed using ImageMagick which is installed by default on all Cloud Functions instances. This is a CLI so we execute the command from node using the child-process-promise package. The image is first downloaded locally from the Cloud Storage bucket to the tmp
folder using the google-cloud SDK.
The dependencies are listed in functions/package.json.
The function triggers on upload of any file to your Firebase project's default Cloud Storage bucket.
To deploy and test the sample:
- Create a Firebase project on the Firebase Console and visit the Storage tab.
- Get the code, for instance using
git clone https://github.com/firebase/functions-samples
- Enter the correct directory
cd functions-samples/quickstarts/thumbnails
- Setup the CLI to use your Firebase project using
firebase use --add
and select your Firebase project - Deploy your project's code using
firebase deploy
- Go to the Firebase Console Storage tab and upload an image. After a short time a thumbnail image with the same name but a
thumb_
prefix will be created in the same folder (make sure you refresh the UI to see the new file).
Copyright (c) 2021 Reyner González. MIT