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D9 – How to add a block on the node ? how to show dynamic QR Block which is having unique QR for each node?

I was solving the problem statement https://github.com/Dineshkushwaha/sph-test/blob/main/README.md and the challenge here is to not use any Contributed module.

I have Created a Hard-coded QR code Block and below is code of that Block:

public function build() {            $path = '';       $directory = "public://Images/QrCodes/";       //prepareDirectory()($directory, FILE_MODIFY_PERMISSIONS | FILE_CREATE_DIRECTORY);       Drupal::service('file_system')->prepareDirectory($directory, DrupalCoreFileFileSystemInterface::CREATE_DIRECTORY);        // Name of the generated image.       $qrName = 'myQrcode';       $uri = $directory . 'QR'. '.png'; // Generates a png image.            $path =  Drupal::service('file_system')->realpath($uri);            // Generate QR code image.       PHPQRCodeQRcode::png("www.google.com", $path, 'L', 4, 2);          $relative_file_url =  Drupal::service('file_url_generator')       ->generateAbsoluteString($uri);             $qr_image = "<img src='{$relative_file_url}'/>";              return [         '#markup' => $qr_image,       ];   }

The only issue is that I am not able to find logic to add the block on node and that too with dynamic QR code.

So Each node will have a unique QR Code Block. Please Help

This article was republished from its original source.
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D9 – How to add a block on the node ? how to show dynamic QR Block which is having unique QR for each node?

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