Image synchronization

?> This is a follow-up guide to Data synchronization which you must complete before proceeding.

?> Android cannot hold binary data into it's clipboard that's why I used a different approach to design this feature. Read about it in FAQ.

Steps

• Enable storage setting in firebase
• Securing storage access (Optional)
• Turn on image synchronization

Enable storage setting in firebase

?> Firebase storage allows us to store any file with a limit of 1 GB for free. By providing optimized control flow we can make use of this feature to get our task done.

• Go to firebase.google.com, and select the project you've created while following above mentioned guide.
• Now go to Storage > Get started > Next > Done to create a default storage in firebase (as shown below).

Securing storage access

?> Currently our storage is R/W by everyone which means anyone can read, write or even delete data. To prevent this we are securing our storage by applying some restrictions.

• Go to Rules tab & change the rules to below.

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

• So above rules says that the XClipper has access to files & folders that are created within /XClipper/images path which can only contain images restricting it's size to be less than 5mb.
• Also, we can only read any child files inside /XClipper directory. This is needed to get lists of files to support batch delete.

Turn on image synchronization

?> Now we have to enable a setting which will then trigger image uploads.

• In XClipper application, go to "Settings" > "Connect" tab.
• From there, check "Bind Image" option (as shown below).

• Now, whenever you press PRTSC or would use Windows snip (Shift + Win + S) it will be delivered to the connected device.