Cloud Function: updateFirestoreWithResizedImage

• Listens for new image uploads in Storage, checks if they are resized, and updates the corresponding user’s Firestore document with the resized image URL.

I use it together with Firebases own function: "Resize Images" which resized all pictures in a custom size and puts in behind the name (image_64x64).

Validates:

• File is an image.
• Image is stored in the uploads folder.
• Image has been resized.
• User exists in Firestore.

Updates Firestore:

• If the resized image matches the current photo_url, it updates the user’s document with the field photo_url_small and puts the image there.