Google Cloud Function (Get image dimensions) - node.js

Question

I am trying to validate the image dimensions of the posts which are in my firebase storage using a Cloud Function. What I am trying to do is:
1: Let the user upload an image
2: When it is uploaded, the backend checks it dimensions
2.1: If it has good dimensions don't remove it
2.2: Else, remove it from the storage
The code looks like:
// Validate image dimensions
exports.validateImageDimensions = functions
.region("us-central1")
.runWith({ memory: "1GB", timeoutSeconds: 120 })
.storage.object()
.onFinalize(async (object) => {
// Get the bucket which contains the image
const bucket = gcs.bucket(object.bucket);
// Get the name
const filePath = object.name;
// Check if the file is an image
const isImage = object.contentType.startsWith("image/");
// Check if the image has valid dimensions
const hasValidDimensions = true; // TODO: How to get the image dimension?
// Do nothing if is an image and has valid dimensions
if (isImage && hasValidDimensions) {
return;
}
try {
await bucket.file(filePath).delete();
console.log(
`The image ${filePath} has been deleted because it has invalid dimensions.`
);
// TODO - Remove image's document in firestore
} catch (err) {
console.log(`Error deleting invalid file ${filePath}: ${err}`);
}
});
But I don't know how to get the object dimensions. I have check the documentation but not having answers.
Any ideas?

Answer 1

Use sharp , here's the documentation that talks about it:
const metadata = await sharp('image.jpg').metadata();
const width = metadata.width;
const height = metadata.height;
functions.logger.log(`width: `, width);
functions.logger.log(`height: `, height);