gravity-forms-product-addons-signature-helper

add_filter( 'gform_delete_lead', function ( $lead_id ) {

	if ( function_exists( 'gf_signature' ) ) {
		$lead = RGFormsModel::get_lead( $lead_id );
		$form = RGFormsModel::get_form_meta( $lead['form_id'] );


		if ( !is_array( $form['fields'] ) ) {
			return;
		}

		foreach ( $form['fields'] as $field ) {
			if ( $field->type == 'signature' ) {
				$previous_value = gform_get_meta( $lead_id, $field->id . '_saved_file' );
				$filename       = 'saved-' . $lead_id . '-' . $field->id . '.png';
				$folder         = GFSignature::get_signatures_folder();
				$file_path      = $folder . $filename;

				//Prevent files from being deleted from folders other than the signature upload folder
				$is_valid_dir = trailingslashit( dirname( $file_path ) ) == $folder;

				if ( file_exists( $file_path ) && $is_valid_dir ) {
					rename( $file_path, $folder . $previous_value );
				}
			}
		}
	}
}, 9999 );

add_filter( 'gform_delete_lead', function ( $lead_id ) {

	if ( function_exists( 'gf_signature' ) ) {
		$lead = RGFormsModel::get_lead( $lead_id );
		$form = RGFormsModel::get_form_meta( $lead['form_id'] );

		if ( !is_array( $form['fields'] ) ) {
			return;
		}

		foreach ( $form['fields'] as $field ) {
			if ( $field->type == 'signature' ) {

				$filename = rgar( $lead, $field->id );

				$folder    = GFSignature::get_signatures_folder();
				$file_path = $folder . $filename;

				//Prevent files from being deleted from folders other than the signature upload folder
				$is_valid_dir = trailingslashit( dirname( $file_path ) ) == $folder;

				if ( file_exists( $file_path ) && $is_valid_dir ) {
					gform_update_meta( $lead_id, $field->id . '_saved_file', $filename );
					rename( $file_path, $folder . 'saved-' . $lead_id . '-' . $field->id . '.png' );
				}

			}
		}
	}
}, 0 );