Firebase Cookbook

How to do it...

Now, let's suppose we have some user-based files that we don't want anyone to read and even write, that is, add a new file to another user personal space, so let's see how we can achieve that: 

      match /secured/personal/{userId}/images/{imageId} {        allow read: if request.auth.uid == userId;      }      match /secured/personal/{userId}/books/{bookId} {        allow read: if request.auth.uid == userId;      }      match /secured/personal/{userId}/images/{imageId} {        allow write: if request.auth.uid == userId &&               request.resource.size < 15 * 1024 * 1024 &&                      request.resource.contentType.matches('image/.*');      }      match /secured/personal/{userId}/books/{bookId} {        allow write: if request.auth.uid == userId &&           request.resource.size < 100 * 1024 * 1024 &&             request.resource.contentType. ...