Storage

Store and serve user-generated content with Cloud Storage.

Overview

Cloud Storage for Firebase lets you upload and share user-generated content like images, videos, and other files.

Uploading Files

Upload a file to Cloud Storage:

import FirebaseStorage

let storage = Storage.storage()
let storageRef = storage.reference()
let imageRef = storageRef.child("images/\(UUID().uuidString).jpg")

let uploadTask = imageRef.putData(imageData, metadata: nil) { metadata, error in
    guard metadata != nil else {
        return
    }
}

Downloading Files

Download a file:

let imageRef = storage.reference().child("images/photo.jpg")

imageRef.getData(maxSize: 10 * 1024 * 1024) { data, error in
    if let error = error {
        print("Error downloading: \(error)")
    } else {
        let image = UIImage(data: data!)
    }
}

Getting Download URLs

Get a download URL for sharing:

imageRef.downloadURL { url, error in
    if let downloadURL = url {
        print("Download URL: \(downloadURL)")
    }
}

Monitoring Progress

Track upload progress:

uploadTask.observe(.progress) { snapshot in
    let percentComplete = 100.0 * Double(snapshot.progress!.completedUnitCount)
        / Double(snapshot.progress!.totalUnitCount)
    print("Upload is \(percentComplete)% complete")
}

Security Rules

Protect your storage with security rules:

rules_version = '2';
service firebase.storage {
  match /b/{bucket}/o {
    match /images/{imageId} {
      allow read: if request.auth != null;
      allow write: if request.auth != null
                   && request.resource.size < 5 * 1024 * 1024
                   && request.resource.contentType.matches('image/.*');
    }
  }
}

Best Practices

• Validate file types and sizes before uploading
• Use unique file names to prevent overwrites
• Delete unused files to save storage costs
• Implement proper security rules