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| 1 | <?php |
| 2 | /** |
| 3 | * JSON-LD Schema.org markup emitter. |
| 4 | * |
| 5 | * Serializes Schema.org `@graph` documents into the page. The primary graph is |
| 6 | * emitted in the document `<head>` and is assembled from independent, |
| 7 | * condition-gated contributions: the site-level Organization node (optionally |
| 8 | * extended as LocalBusiness) and WebSite node, |
| 9 | * emitted on the home page only (Google treats them as single canonical site |
| 10 | * entities), the page node (Article or FAQPage) built by {@see Post_Schema_Node} |
| 11 | * on singular requests, Person/ProfilePage nodes on author archives, and a |
| 12 | * BreadcrumbList on supported public requests. An Article references its |
| 13 | * author's full Person node (added to the same graph) by `@id`, and — like the |
| 14 | * WebSite node — references the home-page Organization as its `publisher` by |
| 15 | * stable `@id` rather than duplicating the node. Emission is gated on |
| 16 | * `Jetpack_SEO_Utils::is_enabled_jetpack_seo()`. |
| 17 | * |
| 18 | * This class owns only the gating and serialization; the individual nodes and |
| 19 | * their stable `@id`s live in their own builders ({@see Post_Schema_Node}, |
| 20 | * {@see Organization_Schema_Node}, {@see Local_Business_Schema_Node}, |
| 21 | * {@see Website_Schema_Node}, {@see Author_Schema_Node}, |
| 22 | * {@see Breadcrumb_Schema_Node}, {@see Schema_Node_Ids}) and are assembled by |
| 23 | * {@see Schema_Graph}. |
| 24 | * |
| 25 | * @package automattic/jetpack-seo-package |
| 26 | */ |
| 27 | |
| 28 | namespace Automattic\Jetpack\SEO; |
| 29 | |
| 30 | use Jetpack_SEO_Utils; |
| 31 | |
| 32 | /** |
| 33 | * Emits Schema.org JSON-LD `@graph` documents into the page. |
| 34 | */ |
| 35 | class Schema_Builder { |
| 36 | |
| 37 | /** |
| 38 | * Wire the front-end emitter. |
| 39 | * |
| 40 | * @return void |
| 41 | */ |
| 42 | public static function init() { |
| 43 | add_action( 'wp_head', array( __CLASS__, 'emit' ), 5 ); |
| 44 | add_action( 'wp_footer', array( __CLASS__, 'emit_woocommerce_breadcrumb_fallback' ), 11 ); |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * Build and echo the JSON-LD `@graph` block for the current request. |
| 49 | * |
| 50 | * @return void |
| 51 | */ |
| 52 | public static function emit() { |
| 53 | // Both plugin classes must be loaded — they're not guaranteed in every |
| 54 | // context, and the post node builder calls Jetpack_SEO_Posts directly. |
| 55 | // @phan-suppress-next-line PhanUndeclaredClassMethod -- Jetpack_SEO_Utils lives in plugins/jetpack; guarded by the class_exists check on the same line. |
| 56 | if ( ! class_exists( 'Jetpack_SEO_Utils' ) || ! class_exists( 'Jetpack_SEO_Posts' ) || ! Jetpack_SEO_Utils::is_enabled_jetpack_seo() ) { |
| 57 | return; |
| 58 | } |
| 59 | |
| 60 | // build_document() gates each node itself and returns null for an empty |
| 61 | // graph, so unsupported or invalid requests emit nothing. |
| 62 | $document = self::build_document(); |
| 63 | if ( null === $document ) { |
| 64 | return; |
| 65 | } |
| 66 | |
| 67 | self::output_document( $document ); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Assemble the `@graph` document for the current request. |
| 72 | * |
| 73 | * The site-level nodes, author archive nodes, singular page node, and breadcrumb |
| 74 | * are independent, condition-gated contributions to one graph: |
| 75 | * |
| 76 | * - Organization and WebSite are single canonical site entities, so their full |
| 77 | * nodes are added on the home page only (Google's guidance). Other pages |
| 78 | * reference the Organization by `@id` instead of duplicating it. |
| 79 | * - Author archives contribute the author's Person node and the ProfilePage |
| 80 | * wrapping it (`mainEntity` → Person `@id`). |
| 81 | * - The page node (Article/FAQPage) is added on singular requests. An Article |
| 82 | * points its `publisher` at the home-page Organization's stable `@id` and its |
| 83 | * `author` at the full Person node added to the same graph. |
| 84 | * - BreadcrumbList is added on supported requests when enabled. WooCommerce |
| 85 | * requests defer to Woo's generated node, with a late Jetpack fallback when |
| 86 | * the active template did not generate one. |
| 87 | * |
| 88 | * Returns null when the graph ends up empty (an unsupported or invalid request) |
| 89 | * so the caller emits nothing rather than an empty graph. |
| 90 | * Cross-node references are wired here rather than inside the individual node |
| 91 | * builders, which stay self-contained and unaware of each other. |
| 92 | * |
| 93 | * @return array|null |
| 94 | */ |
| 95 | private static function build_document() { |
| 96 | $graph = new Schema_Graph(); |
| 97 | |
| 98 | // Effective Organization settings (stored overrides merged over site identity); |
| 99 | // an unconfigured site still yields a valid node from site identity alone. Build |
| 100 | // it regardless so we know whether `@id` references to it (publisher, worksFor) |
| 101 | // will resolve, but only add the full node on the home page. |
| 102 | $organization = Organization_Schema_Node::build( Schema_Settings::get_organization() ); |
| 103 | $organization = Local_Business_Schema_Node::extend( $organization, Schema_Settings::get_local_business() ); |
| 104 | |
| 105 | // Site-level nodes (Organization, WebSite) describe a single canonical |
| 106 | // entity, so they belong on the home page only (Google's guidance) — never |
| 107 | // duplicated onto every post. WebSite references the Organization by @id. |
| 108 | if ( is_front_page() ) { |
| 109 | if ( null !== $organization ) { |
| 110 | $graph->add( $organization ); |
| 111 | } |
| 112 | |
| 113 | $website = Website_Schema_Node::build(); |
| 114 | if ( null !== $website && null !== $organization ) { |
| 115 | $website['publisher'] = array( '@id' => Schema_Node_Ids::organization() ); |
| 116 | } |
| 117 | $graph->add( $website ); |
| 118 | } |
| 119 | |
| 120 | if ( is_author() ) { |
| 121 | $person = self::build_person_node( get_queried_object(), null !== $organization ); |
| 122 | if ( null !== $person ) { |
| 123 | $graph->add( $person ); |
| 124 | $graph->add( Author_Schema_Node::build_profile_page( get_queried_object() ) ); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | if ( is_singular() ) { |
| 129 | $post = get_queried_object(); |
| 130 | $post_node = Post_Schema_Node::build( $post ); |
| 131 | if ( null !== $post_node ) { |
| 132 | // Only the Article node carries publisher/author; FAQPage does not. |
| 133 | // Both are @id references: publisher points at the home-page |
| 134 | // Organization (never duplicated), author points at the full Person |
| 135 | // node added to this page's graph. |
| 136 | if ( 'Article' === ( $post_node['@type'] ?? '' ) ) { |
| 137 | if ( null !== $organization ) { |
| 138 | $post_node['publisher'] = array( '@id' => Schema_Node_Ids::organization() ); |
| 139 | } |
| 140 | $person = self::build_person_node( (int) $post->post_author, null !== $organization ); |
| 141 | if ( null !== $person ) { |
| 142 | $post_node['author'] = array( '@id' => $person['@id'] ); |
| 143 | $graph->add( $person ); |
| 144 | } |
| 145 | } |
| 146 | $graph->add( $post_node ); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | $breadcrumb_settings = Schema_Settings::get_breadcrumb_list(); |
| 151 | if ( $breadcrumb_settings['enabled'] && ! self::woocommerce_may_output_breadcrumb_schema() ) { |
| 152 | $graph->add( Breadcrumb_Schema_Node::build() ); |
| 153 | } |
| 154 | |
| 155 | return $graph->to_document(); |
| 156 | } |
| 157 | |
| 158 | /** |
| 159 | * Emit Jetpack's BreadcrumbList after WooCommerce when WooCommerce was expected |
| 160 | * to provide one but did not actually generate any breadcrumb data. |
| 161 | * |
| 162 | * WooCommerce registers its generator and footer emitter independently of |
| 163 | * whether the active template renders `woocommerce_breadcrumb()`. Waiting until |
| 164 | * after WooCommerce's priority-10 footer emitter lets us inspect the generated |
| 165 | * data instead of treating callback registration as proof of output. |
| 166 | * |
| 167 | * @return void |
| 168 | */ |
| 169 | public static function emit_woocommerce_breadcrumb_fallback() { |
| 170 | // @phan-suppress-next-line PhanUndeclaredClassMethod -- Jetpack_SEO_Utils lives in plugins/jetpack; guarded by the class_exists check on the same line. |
| 171 | if ( ! class_exists( 'Jetpack_SEO_Utils' ) || ! class_exists( 'Jetpack_SEO_Posts' ) || ! Jetpack_SEO_Utils::is_enabled_jetpack_seo() ) { |
| 172 | return; |
| 173 | } |
| 174 | |
| 175 | $breadcrumb_settings = Schema_Settings::get_breadcrumb_list(); |
| 176 | if ( ! $breadcrumb_settings['enabled'] || ! self::woocommerce_may_output_breadcrumb_schema() || self::woocommerce_has_breadcrumb_schema() ) { |
| 177 | return; |
| 178 | } |
| 179 | |
| 180 | $graph = new Schema_Graph(); |
| 181 | $graph->add( Breadcrumb_Schema_Node::build() ); |
| 182 | $document = $graph->to_document(); |
| 183 | if ( null === $document ) { |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | self::output_document( $document ); |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * Whether WooCommerce may emit its own BreadcrumbList for this request. |
| 192 | * |
| 193 | * This deliberately detects capability, not actual output. WooCommerce only |
| 194 | * generates breadcrumb data when its template function runs, so the late |
| 195 | * footer fallback verifies the generated data before relying on it. |
| 196 | * |
| 197 | * @return bool |
| 198 | */ |
| 199 | private static function woocommerce_may_output_breadcrumb_schema() { |
| 200 | // @phan-suppress-next-line PhanUndeclaredFunction -- WooCommerce functions are guarded by function_exists(). |
| 201 | if ( ! function_exists( 'is_woocommerce' ) || ! is_woocommerce() || ! function_exists( 'WC' ) ) { |
| 202 | return false; |
| 203 | } |
| 204 | |
| 205 | // @phan-suppress-next-line PhanUndeclaredFunction -- Guarded by function_exists() above. |
| 206 | $woocommerce = WC(); |
| 207 | if ( ! is_object( $woocommerce ) || ! isset( $woocommerce->structured_data ) ) { |
| 208 | return false; |
| 209 | } |
| 210 | |
| 211 | $structured_data = $woocommerce->structured_data; |
| 212 | return false !== has_action( 'woocommerce_breadcrumb', array( $structured_data, 'generate_breadcrumblist_data' ) ) |
| 213 | && false !== has_action( 'wp_footer', array( $structured_data, 'output_structured_data' ) ); |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * Whether WooCommerce actually generated a BreadcrumbList for this request. |
| 218 | * |
| 219 | * @return bool |
| 220 | */ |
| 221 | private static function woocommerce_has_breadcrumb_schema() { |
| 222 | if ( ! function_exists( 'WC' ) ) { |
| 223 | return false; |
| 224 | } |
| 225 | |
| 226 | // @phan-suppress-next-line PhanUndeclaredFunction -- Guarded by function_exists() above. |
| 227 | $woocommerce = WC(); |
| 228 | if ( ! is_object( $woocommerce ) || ! isset( $woocommerce->structured_data ) || ! method_exists( $woocommerce->structured_data, 'get_data' ) ) { |
| 229 | return false; |
| 230 | } |
| 231 | |
| 232 | $data = $woocommerce->structured_data->get_data(); |
| 233 | return is_array( $data ) && in_array( 'BreadcrumbList', array_column( $data, '@type' ), true ); |
| 234 | } |
| 235 | |
| 236 | /** |
| 237 | * Serialize and output a JSON-LD document. |
| 238 | * |
| 239 | * @param array $document Schema.org document. |
| 240 | * @return void |
| 241 | */ |
| 242 | private static function output_document( array $document ) { |
| 243 | printf( |
| 244 | '<script type="application/ld+json">%s</script>', |
| 245 | // Default flags escape forward slashes — important inside <script> |
| 246 | // so a "</script>" in the data can't break out of the block. |
| 247 | wp_json_encode( $document, JSON_UNESCAPED_UNICODE ) // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped |
| 248 | ); |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * Build the author Person node, wiring `worksFor` to the site Organization's |
| 253 | * stable `@id` when the Organization node resolves. |
| 254 | * |
| 255 | * @param \WP_User|int|null $user User object or ID. |
| 256 | * @param bool $has_organization Whether the Organization node resolves. |
| 257 | * @return array|null |
| 258 | */ |
| 259 | private static function build_person_node( $user, $has_organization ) { |
| 260 | $person = Author_Schema_Node::build_person( $user ); |
| 261 | if ( null !== $person && $has_organization ) { |
| 262 | $person['worksFor'] = array( '@id' => Schema_Node_Ids::organization() ); |
| 263 | } |
| 264 | return $person; |
| 265 | } |
| 266 | } |