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Merge pull request #857 from Automattic/add/canonical-head
Add initial canonical AMP support
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,229 @@ | ||
| <?php | ||
| /** | ||
| * Class AMP_Theme_Support | ||
| * | ||
| * @package AMP | ||
| */ | ||
|
|
||
| /** | ||
| * Class AMP_Theme_Support | ||
| * | ||
| * Callbacks for adding AMP-related things when theme support is added. | ||
| */ | ||
| class AMP_Theme_Support { | ||
|
|
||
| const COMPONENT_SCRIPTS_PLACEHOLDER = '<!--AMP_COMPONENT_SCRIPTS_PLACEHOLDER-->'; | ||
|
|
||
| /** | ||
| * Register hooks. | ||
| */ | ||
| public static function register_hooks() { | ||
|
|
||
| // Remove core actions which are invalid AMP. | ||
| remove_action( 'wp_head', 'locale_stylesheet' ); | ||
| remove_action( 'wp_head', 'print_emoji_detection_script', 7 ); | ||
| remove_action( 'wp_head', 'wp_print_styles', 8 ); | ||
| remove_action( 'wp_head', 'wp_print_head_scripts', 9 ); | ||
| remove_action( 'wp_head', 'wp_custom_css_cb', 101 ); | ||
| remove_action( 'wp_footer', 'wp_print_footer_scripts', 20 ); | ||
| remove_action( 'wp_print_styles', 'print_emoji_styles' ); | ||
|
|
||
| // Replace core's canonical link functionality with one that outputs links for non-singular queries as well. See WP Core #18660. | ||
| remove_action( 'wp_head', 'rel_canonical' ); | ||
| add_action( 'wp_head', array( __CLASS__, 'add_canonical_link' ), 1 ); | ||
|
|
||
| // @todo Add add_schemaorg_metadata(), add_analytics_data(), etc. | ||
| // Add additional markup required by AMP <https://www.ampproject.org/docs/reference/spec#required-markup>. | ||
| add_action( 'wp_head', array( __CLASS__, 'add_meta_charset' ), 0 ); | ||
| add_action( 'wp_head', array( __CLASS__, 'add_meta_viewport' ), 2 ); | ||
| add_action( 'wp_head', 'amp_print_boilerplate_code', 3 ); | ||
| add_action( 'wp_head', array( __CLASS__, 'add_scripts' ), 4 ); | ||
| add_action( 'wp_head', array( __CLASS__, 'add_styles' ), 5 ); | ||
| add_action( 'wp_head', array( __CLASS__, 'add_meta_generator' ), 6 ); | ||
|
|
||
| /* | ||
| * Disable admin bar because admin-bar.css (28K) and Dashicons (48K) alone | ||
| * combine to surpass the 50K limit imposed for the amp-custom style. | ||
| */ | ||
| add_filter( 'show_admin_bar', '__return_false', 100 ); | ||
|
|
||
| // Start output buffering at very low priority for sake of plugins and themes that use template_redirect instead of template_include. | ||
| add_action( 'template_redirect', array( __CLASS__, 'start_output_buffering' ), 0 ); | ||
|
|
||
| // @todo Add output buffering. | ||
| // @todo Add character conversion. | ||
| } | ||
|
|
||
| /** | ||
| * Print meta charset tag. | ||
| * | ||
| * @link https://www.ampproject.org/docs/reference/spec#chrs | ||
| */ | ||
| public static function add_meta_charset() { | ||
| echo '<meta charset="utf-8">'; | ||
| } | ||
|
|
||
| /** | ||
| * Print meta charset tag. | ||
| * | ||
| * @link https://www.ampproject.org/docs/reference/spec#vprt | ||
| */ | ||
| public static function add_meta_viewport() { | ||
| echo '<meta name="viewport" content="width=device-width,minimum-scale=1">'; | ||
| } | ||
|
|
||
| /** | ||
| * Print AMP script and placeholder for others. | ||
| * | ||
| * @link https://www.ampproject.org/docs/reference/spec#scrpt | ||
| */ | ||
| public static function add_scripts() { | ||
| echo '<script async src="https://cdn.ampproject.org/v0.js"></script>'; // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript | ||
|
|
||
| // Replaced after output buffering with all AMP component scripts. | ||
| echo self::COMPONENT_SCRIPTS_PLACEHOLDER; // phpcs:ignore WordPress.Security.EscapeOutput, WordPress.XSS.EscapeOutput | ||
| } | ||
|
|
||
| /** | ||
| * Add canonical link. | ||
| * | ||
| * Replaces `rel_canonical()` which only outputs canonical URLs for singular posts and pages. | ||
| * This can be removed once WP Core #18660 lands. | ||
| * | ||
| * @link https://www.ampproject.org/docs/reference/spec#canon. | ||
| * @link https://core.trac.wordpress.org/ticket/18660 | ||
| * | ||
| * @see rel_canonical() | ||
| * @global WP $wp | ||
| * @global WP_Rewrite $wp_rewrite | ||
| */ | ||
| public static function add_canonical_link() { | ||
| global $wp, $wp_rewrite; | ||
|
|
||
| $url = null; | ||
| if ( is_singular() ) { | ||
| $url = wp_get_canonical_url(); | ||
| } | ||
|
|
||
| // For non-singular queries, make use of the request URI and public query vars to determine canonical URL. | ||
| if ( empty( $url ) ) { | ||
| $added_query_vars = $wp->query_vars; | ||
| if ( ! $wp_rewrite->permalink_structure || empty( $wp->request ) ) { | ||
| $url = home_url( '/' ); | ||
| } else { | ||
| $url = home_url( user_trailingslashit( $wp->request ) ); | ||
| parse_str( $wp->matched_query, $matched_query_vars ); | ||
| foreach ( $wp->query_vars as $key => $value ) { | ||
|
|
||
| // Remove query vars that were matched in the rewrite rules for the request. | ||
| if ( isset( $matched_query_vars[ $key ] ) ) { | ||
| unset( $added_query_vars[ $key ] ); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if ( ! empty( $added_query_vars ) ) { | ||
| $url = add_query_arg( $added_query_vars, $url ); | ||
| } | ||
|
|
||
| if ( ! amp_is_canonical() ) { | ||
|
|
||
| // Strip endpoint. | ||
| $url = preg_replace( ':/' . preg_quote( AMP_QUERY_VAR, ':' ) . '(?=/?(\?|#|$)):', '', $url ); | ||
|
|
||
| // Strip query var. | ||
| $url = remove_query_arg( AMP_QUERY_VAR, $url ); | ||
| } | ||
|
|
||
| echo '<link rel="canonical" href="' . esc_url( $url ) . '">' . "\n"; | ||
| } | ||
|
|
||
| /** | ||
| * Print Custom AMP styles. | ||
| * | ||
| * @see wp_custom_css_cb() | ||
| */ | ||
| public static function add_styles() { | ||
| echo '<style amp-custom>'; | ||
|
|
||
| // @todo Grab source of all enqueued styles and concatenate here? | ||
| // @todo Print contents of get_locale_stylesheet_uri()? | ||
| // @todo Allow this to be filtered after output buffering is complete so additional styles can be added by widgets and other components just-in-time? | ||
| $path = get_template_directory() . '/style.css'; // @todo Honor filter in get_stylesheet_directory_uri()? Style must be local. | ||
| $css = file_get_contents( $path ); // phpcs:ignore WordPress.WP.AlternativeFunctions -- It's not a remote file. | ||
| echo wp_strip_all_tags( $css ); // WPCS: XSS OK. | ||
|
|
||
| // Implement AMP version of wp_custom_css_cb(). | ||
| $custom_css = trim( wp_get_custom_css() ); | ||
| if ( ! empty( $custom_css ) ) { | ||
| echo '/* start:wp_get_custom_css */'; | ||
| echo wp_strip_all_tags( wp_get_custom_css() ); // WPCS: XSS OK. | ||
| echo '/* end:wp_get_custom_css */'; | ||
| } | ||
| echo '</style>'; | ||
| } | ||
|
|
||
| /** | ||
| * Print AMP meta generator tag. | ||
| */ | ||
| public static function add_meta_generator() { | ||
| printf( '<meta name="generator" content="%s" />', esc_attr( 'AMP Plugin v' . AMP__VERSION ) ); | ||
| } | ||
|
|
||
| /** | ||
| * Determine required AMP scripts. | ||
| * | ||
| * @param string $html Output HTML. | ||
| * @return string Scripts to inject into the HEAD. | ||
| */ | ||
| public static function get_required_amp_scripts( $html ) { | ||
|
|
||
| // @todo This should be integrated with the existing Sanitizer classes so that duplication is not done here. | ||
| $amp_scripts = array( | ||
| 'amp-form' => array( | ||
| 'pattern' => '#<(form|input)\b#i', | ||
| 'source' => 'https://cdn.ampproject.org/v0/amp-form-0.1.js', | ||
| ), | ||
| // @todo Add more. | ||
| ); | ||
|
|
||
| $scripts = ''; | ||
| foreach ( $amp_scripts as $component => $props ) { | ||
| if ( preg_match( '#<(form|input)\b#i', $html ) ) { | ||
| $scripts .= sprintf( | ||
| '<script async custom-element="%s" src="%s"></script>', // phpcs:ignore WordPress.WP.EnqueuedResources, WordPress.XSS.EscapeOutput.OutputNotEscaped | ||
| $component, | ||
| $props['source'] | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| return $scripts; | ||
| } | ||
|
|
||
| /** | ||
| * Start output buffering. | ||
| */ | ||
| public static function start_output_buffering() { | ||
| ob_start( array( __CLASS__, 'finish_output_buffering' ) ); | ||
| } | ||
|
|
||
| /** | ||
| * Finish output buffering. | ||
| * | ||
| * @param string $output Buffered output. | ||
| * @return string Finalized output. | ||
| */ | ||
| public static function finish_output_buffering( $output ) { | ||
| $output = preg_replace( | ||
| '#' . preg_quote( self::COMPONENT_SCRIPTS_PLACEHOLDER, '#' ) . '#', | ||
| self::get_required_amp_scripts( $output ), | ||
| $output, | ||
| 1 | ||
| ); | ||
|
|
||
| // @todo Add more validation checking and potentially the whitelist sanitizer. | ||
| return $output; | ||
| } | ||
| } |
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