Add upstream

wp-content/plugins/jetpack/modules/pwa/class.jetpack-pwa-helpers.php

@@ -0,0 +1,62 @@
+<?php
+class Jetpack_PWA_Helpers {
+	public static function get_default_manifest_icon_sizes() {
+		// These icon sizes based on conversation here:
+		// https://github.com/GoogleChrome/lighthouse/issues/291
+		return array(
+			192,
+			512,
+		);
+	}
+
+	public static function site_icon_url( $size = 512 ) {
+		$url = get_site_icon_url( $size );
+
+		// Fall back to built-in WordPress icon
+		if ( ! $url && in_array( $size, self::get_default_manifest_icon_sizes() ) ) {
+			$url = esc_url_raw(
+				plugins_url( "modules/pwa/images/wp-$size.png", JETPACK__PLUGIN_FILE )
+			);
+		}
+
+		return $url;
+	}
+
+	public static function get_theme_color() {
+		$theme_color = false;
+
+		// if we have AMP enabled, use those colors?
+		if ( class_exists( 'AMP_Customizer_Settings' ) ) {
+			/* This filter is documented in wp-content/plugins/amp/includes/class-amp-post-template.php */
+			$amp_settings = apply_filters(
+				'amp_post_template_customizer_settings',
+				AMP_Customizer_Settings::get_settings(),
+				null
+			);
+
+			if ( isset( $amp_settings['header_background_color'] ) ) {
+				$theme_color = $amp_settings['header_background_color'];
+			}
+		}
+
+		if ( ! $theme_color && current_theme_supports( 'custom-background' ) ) {
+			$background_color = get_background_color(); // Returns hex key without hash or empty string
+			if ( $background_color ) {
+				$theme_color = "#$background_color";
+			}
+		}
+
+		if ( ! $theme_color ) {
+			$theme_color = '#fff';
+		}
+
+		/**
+		 * Allows overriding the PWA theme color which is used when loading the app.
+		 *
+		 * @since 5.6.0
+		 *
+		 * @param string $theme_color
+		 */
+		return apply_filters( 'jetpack_pwa_background_color', $theme_color );
+	}
+}

wp-content/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 ),
+		);
+	}
+}