public function get_attachment_id_from_url( $url, $product_id ) {
		if ( empty( $url ) ) {
			return 0;
		}

		$id         = 0;
		$upload_dir = wp_upload_dir( null, false );
		$base_url   = $upload_dir['baseurl'] . '/';

		// Check first if attachment is inside the WordPress uploads directory, or we're given a filename only.
		if ( false !== strpos( $url, $base_url ) || false === strpos( $url, '://' ) ) {
			// Search for yyyy/mm/slug.extension or slug.extension - remove the base URL.
			$file = str_replace( $base_url, '', $url );
			$args = array(
				'post_type'   => 'attachment',
				'post_status' => 'any',
				'fields'      => 'ids',
				'meta_query'  => array( // @codingStandardsIgnoreLine.
					'relation' => 'OR',
					array(
						'key'     => '_wp_attached_file',
						'value'   => '^' . $file,
						'compare' => 'REGEXP',
					),
					array(
						'key'     => '_wp_attached_file',
						'value'   => '/' . $file,
						'compare' => 'LIKE',
					),
					array(
						'key'     => '_wc_attachment_source',
						'value'   => '/' . $file,
						'compare' => 'LIKE',
					),
				),
			);
		} else {
			// This is an external URL, so compare to source.
			$args = array(
				'post_type'   => 'attachment',
				'post_status' => 'any',
				'fields'      => 'ids',
				'meta_query'  => array( // @codingStandardsIgnoreLine.
					array(
						'value' => $url,
						'key'   => '_wc_attachment_source',
					),
				),
			);
		}

		$ids = get_posts( $args ); // @codingStandardsIgnoreLine.

		if ( $ids ) {
			$id = current( $ids );
		}

		// Upload if attachment does not exists.
		if ( ! $id && stristr( $url, '://' ) ) {
			$upload = wc_rest_upload_image_from_url( $url );

			if ( is_wp_error( $upload ) ) {
				throw new Exception( $upload->get_error_message(), 400 );
			}

			$id = wc_rest_set_uploaded_image_as_attachment( $upload, $product_id );

			if ( ! wp_attachment_is_image( $id ) ) {
				/* translators: %s: image URL */
				throw new Exception( sprintf( __( 'Not able to attach "%s".', 'woocommerce' ), $url ), 400 );
			}

			// Save attachment source for future reference.
			update_post_meta( $id, '_wc_attachment_source', $url );
		}

		if ( ! $id ) {
			/* translators: %s: image URL */
			throw new Exception( sprintf( __( 'Unable to use image "%s".', 'woocommerce' ), $url ), 400 );
		}

		return $id;
	}