Prevent upload of the same files in media library

prevent-duplicates.php

<?php
//in media.php class
  /**
   * Checks if the file with the same name exists in the media library, and renames it if it does
   *
   * @param  array $file An array of data for a single file.
   * @return array $file Modified array of data for a single file if the file name is the same.
   */
  public function intercept_file_upload( $file ) {
    // If, for some odd reason, the file name is empty don't bother with it and let WP handle it.
    if ( empty( $file[ 'name' ] ) ) {
      return $file;
    }

    // Only check yaml files, we're not interested in the images.
    if ( strpos( $file[ 'name' ], 'yaml' ) === false ) {
      return $file;
    }

    // Search for all the yaml files.
    $file_info = pathinfo( $file[ 'name' ] );
    $file_name = $file_info[ 'filename' ];

    global $wpdb;

    $results = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM {$wpdb->prefix}posts WHERE post_type = 'attachment' AND post_mime_type = 'application/x-yaml' AND post_title = %s", $file_name ), ARRAY_A );

    if ( ! empty( $results ) ) {
      $file[ 'error' ] = esc_html__( 'Duplicate names are not allowed', 'plugin_name' );
    }

    return $file;
  }

// in main.php
$this->loader->add_filter( 'wp_handle_upload_prefilter', $this->media, 'intercept_file_upload' );