1 files changed, 95 insertions, 0 deletions
diff --git a/plugins/jetpack/modules/pwa/class.jetpack-pwa-manifest.php b/plugins/jetpack/modules/pwa/class.jetpack-pwa-manifest.php
new file mode 100644
index 00000000..c294c2d0
--- /dev/null
+++ b/plugins/jetpack/modules/pwa/class.jetpack-pwa-manifest.php
@@ -0,0 +1,95 @@
+<?php
+
+class Jetpack_PWA_Manifest {
+	/**
+	 * @var Jetpack_PWA_Manifest
+	 */
+	private static $__instance = null;
+
+	/**
+	 * When this query var is present, display the PWA manifest.
+	 *
+	 * @var string
+	 */
+	const PWA_MANIFEST_QUERY_VAR = 'jetpack_app_manifest';
+
+	/**
+	 * Singleton implementation
+	 *
+	 * @return Jetpack_PWA_Manifest
+	 */
+	public static function instance() {
+		if ( is_null( self::$__instance ) ) {
+			self::$__instance = new Jetpack_PWA_Manifest;
+		}
+
+		return self::$__instance;
+	}
+
+	/**
+	 * Registers actions the first time that instance() is called.
+	 */
+	private function __construct() {
+		add_action( 'wp_head', array( $this, 'render_manifest_link' ) );
+		add_action( 'amp_post_template_head', array( $this, 'render_manifest_link' ) );
+		add_action( 'template_redirect', array( $this, 'render_manifest_json' ), 2 );
+	}
+
+	function render_manifest_link() {
+		?>
+			<link rel="manifest" href="<?php echo esc_url_raw( $this->get_manifest_url() ); ?>">
+			<meta name="theme-color" content="<?php echo esc_attr( Jetpack_PWA_Helpers::get_theme_color() ); ?>">
+		<?php
+	}
+
+	public function get_manifest_url() {
+		return add_query_arg(
+			self::PWA_MANIFEST_QUERY_VAR, '1', home_url()
+		);
+	}
+
+	function render_manifest_json() {
+		// Do not load manifest in multiple locations
+		if ( is_front_page() && isset( $_GET[ self::PWA_MANIFEST_QUERY_VAR ] ) && $_GET[ self::PWA_MANIFEST_QUERY_VAR ] ) {
+			@ini_set( 'display_errors', false ); // Display errors can cause the XML to be not well formed.
+
+			$theme_color = Jetpack_PWA_Helpers::get_theme_color();
+
+			$manifest = array(
+				'name'       => get_bloginfo( 'name' ),
+				'start_url'  => get_home_url(),
+				'short_name' => substr( get_bloginfo( 'name' ), 0, 12 ),
+				'display'    => 'standalone',
+				'background_color' => $theme_color,
+				'theme_color'      => $theme_color,
+			);
+
+			if ( $description = get_bloginfo( 'description' ) ) {
+				$manifest['description'] = $description;
+			}
+
+			$manifest['icons'] = array_map(
+				array( $this, 'build_icon_object' ),
+				Jetpack_PWA_Helpers::get_default_manifest_icon_sizes()
+			);
+
+			/**
+			 * Allow overriding the manifest.
+			 *
+			 * @since 5.6.0
+			 *
+			 * @param array $manifest
+			 */
+			$manifest = apply_filters( 'jetpack_pwa_manifest', $manifest );
+
+			wp_send_json( $manifest );
+		}
+	}
+
+	function build_icon_object( $size ) {
+		return array(
+			'src' => Jetpack_PWA_Helpers::site_icon_url( $size ),
+			'sizes' => sprintf( '%1$dx%1$d', $size ),
+		);
+	}
+}