Start laying in output to handle cart expirations & extensions

src/includes/data-utilities.php

@@ -54,12 +54,13 @@ function mt_save_data( $passed, $type = 'cart', $override = false ) {
 			delete_transient( 'mt_' . $unique_id . '_' . $type );
 		}
 		set_transient( 'mt_' . $unique_id . '_' . $type, $save, time() + $expiration );
-
+		if ( ! get_transient( 'mt_' . $unique_id . '_expiration' ) ) {
+			set_transient( 'mt_' . $unique_id . '_expiration', time() + $expiration, time() + $expiration );
+		}
 		return true;
 	}
 }
 
-
 /**
  * Abstract function to delete data. Defaults to delete user's shopping cart.
  *
@@ -90,10 +91,10 @@ function mt_get_data( $type, $user_ID = false ) {
 	} else {
 		if ( is_user_logged_in() ) {
 			$current_user = wp_get_current_user();
-			$data_age     = get_user_meta( $current_user->ID, "_mt_user_init_$type", true );
+			$data_age     = get_user_meta( $current_user->ID, "_mt_user_init_expiration", true );
 			if ( ! $data_age ) {
 				$expiration = mt_expiration_window();
-				update_user_meta( $current_user->ID, "_mt_user_init_$type", time() + $expiration );
+				update_user_meta( $current_user->ID, "_mt_user_init_expiration", time() + $expiration );
 			}
 			if ( time() > $data_age ) {
 				// Expire user's cart after the data ages out.
@@ -191,7 +192,7 @@ function mt_expiration_window() {
 	$expiration = $options['mt_expiration'];
 	// Doesn't support less than 10 minutes.
 	if ( ! $expiration || (int) $expiration < 600 ) {
-		$return = WEEK_IN_SECONDS;
+		$expiration = WEEK_IN_SECONDS;
 	}
 	$return = absint( $expiration );
 	/**
@@ -207,3 +208,50 @@ function mt_expiration_window() {
 
 	return $expiration;
 }
+
+/**
+ * Get cart expiration timestamp.
+ */
+function mt_get_expiration() {
+	$expires_at = 0;
+	if ( is_user_logged_in() ) {
+		$current_user = wp_get_current_user();
+		$expires_at   = get_user_meta( $current_user->ID, "_mt_user_init_expiration", true );
+	} else {
+		$unique_id = mt_get_unique_id();
+		if ( $unique_id ) {
+			$expires_at = get_transient( 'mt_' . $unique_id . '_expiration' );
+		}
+	}
+
+	return absint( $expires_at );
+}
+
+/**
+ * Check whether a user's cart or payment info is expired at init.
+ */
+function mt_is_cart_expired() {
+	$types = array( 'cart', 'payment', 'offline-payment' );
+	if ( is_user_logged_in() ) {
+		$current_user = wp_get_current_user();
+		foreach ( $types as $type ) {
+			$data_age = get_user_meta( $current_user->ID, "_mt_user_init_$type", true );
+			if ( time() > $data_age ) {
+				// Expire user's cart after the data ages out.
+				delete_user_meta( $current_user->ID, "_mt_user_$type" );
+			}
+		}
+	} else {
+		$unique_id = mt_get_unique_id();
+		if ( $unique_id ) {
+			$expiration = get_transient( 'mt_' . $unique_id . '_expiration' );
+			if ( time() > $expiration ) {
+				delete_transient( 'mt_' . $unique_id . '_expiration' );
+				foreach ( $types as $type ) {
+					delete_transient( 'mt_' . $unique_id . '_' . $type );
+				}
+			}
+		}
+	}
+}
+add_action( 'init', 'mt_is_cart_expired' );

src/mt-add-to-cart.php

@@ -293,8 +293,9 @@ function mt_registration_form( $content, $event = false, $view = 'calendar', $ti
  * @return array|bool 'false' if ticket is not purchaseable.
  */
 function mt_ticket_row( $event_id, $registration, $settings, $type, $available, $tickets_remaining ) {
-	$options = array_merge( mt_default_settings(), get_option( 'mt_settings', array() ) );
-	$pricing = $registration['prices'];
+	$options   = array_merge( mt_default_settings(), get_option( 'mt_settings', array() ) );
+	$pricing   = $registration['prices'];
+	$cart_data = array();
 	if ( is_array( mt_in_cart( $event_id ) ) ) {
 		$cart_data = mt_in_cart( $event_id );
 	}

src/mt-cart.php

@@ -673,6 +673,24 @@ function mt_gateways() {
 	}
 }
 
+/**
+ * Display time remaining before cart expiration.
+ */
+function mt_generate_expiration() {
+	$expiration = mt_get_expiration();
+	$output     = '';
+	if ( 0 === $expiration ) {
+		return;
+	}
+	if ( ( $expiration - time() ) > 30 * MINUTE_IN_SECONDS ) {
+		$output = '<div class="expiration-notice"><p>' . sprintf( __( 'Your shopping cart will be saved for %s.', 'my-tickets' ), human_time_diff( time(), $expiration ) ) . '</p></div>';;
+	} else {
+		$output = '<div class="expiration-extension"><p>' . sprintf( __( 'Your shopping cart will expire in %s.', 'my-tickets' ), human_time_diff( time(), $expiration ) ) . '<button type="button">' . __( 'Extend 5 minutes', 'my-tickets' ) . '</button></p></div>';
+	}
+
+	return $output;
+}
+
 /**
  * Generate breadcrumb path for cart purchase process
  *
@@ -708,6 +726,7 @@ function mt_generate_cart( $user_ID = false ) {
 	// if submitted successfully & payment required, toggle to payment form.
 	$options     = array_merge( mt_default_settings(), get_option( 'mt_settings', array() ) );
 	$gateway     = isset( $_POST['mt_gateway'] ) ? sanitize_text_field( $_POST['mt_gateway'] ) : false;
+	$expiration  = mt_generate_expiration();
 	$breadcrumbs = mt_generate_path( $gateway );
 	// TODO: If gateway is offline, mt_generate_gateway is never run. Use mt_generate_gateway to create button in both cases.
 	// Need to handle the case where multiple gateways are available, however; can't display the gateway until after gateway is selected.
@@ -776,7 +795,7 @@ function mt_generate_cart( $user_ID = false ) {
 		}
 	}
 
-	return $breadcrumbs . $output;
+	return $expiration . $breadcrumbs . $output;
 }
 
 /**