apply_filters( ‘wp_script_attributes’, array $attributes )

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   Matt Radford 2 years ago

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   If you want to harden your website against supply chain attacks, you can use this filter to add Subresource integrity checking to a script.

   For example, for Select2 script at v4.0.9 from cdnjs.com, you would copy the SRI hash from https://cdnjs.com/libraries/select2/4.0.9, and add it as an attribute to the script.

   Then check for the select2-js ID, and that it is delivered by CDNJS, before adding the SRI attributes.

   /**
    * Add Subresource Integrity check to CDNJS Select2 script.
    *
    * @param  array $attr Attributes of each script.
    *
    * @return array $attr Attributes of each script.
    */
   function wpdocs_script_subresource_integrity( array $attr ): array {
   	if ( empty( $attr['id'] ) || empty( $attr['src'] ) ) {
   		return $attr;
   	}
   
   	if ( 'select2-js' === $attr['id'] && str_contains( $attr['src'], 'cdnjs.cloudflare.com' ) ) {
   		$attr['integrity']   = 'sha512-9p/L4acAjbjIaaGXmZf0Q2bV42HetlCLbv8EP0z3rLbQED2TAFUlDvAezy7kumYqg5T8jHtDdlm1fgIsr5QzKg==';
   		$attr['crossorigin'] = 'anonymous';
   	}
   
   	return $attr;
   }
   add_filter( 'wp_script_attributes', 'wpdocs_script_subresource_integrity', 10, 1 );