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| 1 | <?php |
| 2 | /** |
| 3 | * Hooks the Sharing Buttons and Like blocks into single post and page templates. |
| 4 | * |
| 5 | * @package automattic/jetpack-sharing-likes |
| 6 | */ |
| 7 | |
| 8 | declare( strict_types = 1 ); |
| 9 | |
| 10 | namespace Automattic\Jetpack\Sharing_Likes\Hooked_Blocks; |
| 11 | |
| 12 | use Automattic\Jetpack\Sharing_Likes\Block_Names; |
| 13 | use Automattic\Jetpack\Sharing_Likes\Post_Likes_Switch; |
| 14 | use Automattic\Jetpack\Sharing_Likes\Post_Sharing_Switch; |
| 15 | use Automattic\Jetpack\Sharing_Likes\Settings\Environment; |
| 16 | |
| 17 | /** |
| 18 | * Places `jetpack/sharing-buttons` and `jetpack/like` before or after `core/post-content` |
| 19 | * with the Block Hooks API, where `Template_Placements` asks for them. |
| 20 | * |
| 21 | * Callbacks read options and site facts each time, since WordPress.com REST requests switch blogs |
| 22 | * after `init`, and never resolve a template, since building one applies block hooks. |
| 23 | * |
| 24 | * @since $$next-version$$ |
| 25 | */ |
| 26 | final class Hooked_Blocks { |
| 27 | |
| 28 | private const ANCHOR = 'core/post-content'; |
| 29 | |
| 30 | /** |
| 31 | * Block Hooks position for each placement. |
| 32 | */ |
| 33 | private const POSITIONS = array( |
| 34 | 'before' => Template_Placements::BEFORE_CONTENT, |
| 35 | 'after' => Template_Placements::AFTER_CONTENT, |
| 36 | ); |
| 37 | |
| 38 | /** |
| 39 | * Alignments `core/group` shares with `core/post-content`. |
| 40 | */ |
| 41 | private const ALIGNMENTS = array( 'wide', 'full' ); |
| 42 | |
| 43 | /** |
| 44 | * Hook everything up. Safe to call more than once: a hook keeps one copy of a callback per priority. |
| 45 | */ |
| 46 | public static function init(): void { |
| 47 | // Ahead of Newsletter's Subscribe block at 10, whichever registers first. |
| 48 | add_filter( 'hooked_block_types', array( self::class, 'hook_block_types' ), 5, 4 ); |
| 49 | add_filter( 'hooked_block_' . Block_Names::SHARING_BUTTONS, array( self::class, 'build_sharing_buttons' ), 10, 4 ); |
| 50 | add_filter( 'hooked_block_' . Block_Names::LIKE, array( self::class, 'build_like' ), 10, 4 ); |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Add the blocks around `core/post-content` in the templates and patterns that show one post or page. |
| 55 | * |
| 56 | * @param mixed $hooked_block_types Block types hooked at this anchor and position. |
| 57 | * @param string $relative_position Position relative to the anchor. |
| 58 | * @param mixed $anchor_block_type Anchor block type; null for freeform content. |
| 59 | * @param mixed $context Template, template part, pattern array or post the anchor belongs to. |
| 60 | * @return mixed |
| 61 | */ |
| 62 | public static function hook_block_types( $hooked_block_types, $relative_position, $anchor_block_type, $context ) { |
| 63 | if ( self::ANCHOR !== $anchor_block_type || ! is_array( $hooked_block_types ) || ! isset( self::POSITIONS[ $relative_position ] ) ) { |
| 64 | return $hooked_block_types; |
| 65 | } |
| 66 | |
| 67 | $placement = self::POSITIONS[ $relative_position ]; |
| 68 | $wanted = array(); |
| 69 | |
| 70 | if ( in_array( $placement, Template_Placements::get( Template_Placements::FEATURE_SHARING ), true ) ) { |
| 71 | $wanted[] = Block_Names::SHARING_BUTTONS; |
| 72 | } |
| 73 | if ( in_array( $placement, Template_Placements::get( Template_Placements::FEATURE_LIKES ), true ) ) { |
| 74 | $wanted[] = Block_Names::LIKE; |
| 75 | } |
| 76 | |
| 77 | if ( ! $wanted || ! self::is_single_view_context( $context, self::post_types() ) || ! self::blocks_can_load() ) { |
| 78 | return $hooked_block_types; |
| 79 | } |
| 80 | |
| 81 | foreach ( $wanted as $block ) { |
| 82 | if ( |
| 83 | self::legacy_buttons_absent( $block ) |
| 84 | && ! self::viewed_post_declines( $block ) |
| 85 | && ! self::already_placed( $block, $context ) |
| 86 | && ! in_array( $block, $hooked_block_types, true ) |
| 87 | ) { |
| 88 | $hooked_block_types[] = $block; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | return $hooked_block_types; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Give the hooked Sharing Buttons block its buttons, in a group laid out like the post content. |
| 97 | * |
| 98 | * @param mixed $parsed_hooked_block The hooked block, or null when suppressed. |
| 99 | * @param string $hooked_block_type Hooked block type. |
| 100 | * @param string $relative_position Position relative to the anchor. |
| 101 | * @param mixed $parsed_anchor_block The anchor block. |
| 102 | * @return mixed |
| 103 | */ |
| 104 | public static function build_sharing_buttons( $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block ) { |
| 105 | if ( ! is_array( $parsed_hooked_block ) || ! self::is_content_placement( $relative_position, $parsed_anchor_block ) ) { |
| 106 | return $parsed_hooked_block; |
| 107 | } |
| 108 | |
| 109 | return self::wrap_in_group( Sharing_Buttons_Markup::fill( $parsed_hooked_block ), $parsed_anchor_block ); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Put the hooked Like block in a group laid out like the post content. |
| 114 | * |
| 115 | * @param mixed $parsed_hooked_block The hooked block, or null when suppressed. |
| 116 | * @param string $hooked_block_type Hooked block type. |
| 117 | * @param string $relative_position Position relative to the anchor. |
| 118 | * @param mixed $parsed_anchor_block The anchor block. |
| 119 | * @return mixed |
| 120 | */ |
| 121 | public static function build_like( $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block ) { |
| 122 | if ( ! is_array( $parsed_hooked_block ) || ! self::is_content_placement( $relative_position, $parsed_anchor_block ) ) { |
| 123 | return $parsed_hooked_block; |
| 124 | } |
| 125 | |
| 126 | return self::wrap_in_group( $parsed_hooked_block, $parsed_anchor_block ); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Post types whose single views get the blocks. |
| 131 | * |
| 132 | * @return string[] |
| 133 | */ |
| 134 | private static function post_types(): array { |
| 135 | /** |
| 136 | * Filters the post types whose single views get the Sharing Buttons and Like blocks the template placements add. |
| 137 | * |
| 138 | * @since $$next-version$$ |
| 139 | * |
| 140 | * @param string[] $post_types Post type names. Default posts and pages. |
| 141 | */ |
| 142 | $post_types = apply_filters( 'jetpack_sharing_likes_template_placement_post_types', array( 'post', 'page' ) ); |
| 143 | |
| 144 | return is_array( $post_types ) ? array_values( array_unique( array_filter( $post_types, 'is_string' ) ) ) : array( 'post', 'page' ); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Whether a context shows a single view of one of the post types: a template by the post types it serves, |
| 149 | * a pattern by its template types, else by the current request, which never holds in the Site Editor's REST requests. |
| 150 | * |
| 151 | * @param mixed $context Template, template part, pattern array or post. |
| 152 | * @param string[] $post_types Post types that get the blocks. |
| 153 | */ |
| 154 | private static function is_single_view_context( $context, array $post_types ): bool { |
| 155 | if ( ! $post_types ) { |
| 156 | return false; |
| 157 | } |
| 158 | |
| 159 | // Once the front end picks a template, its request has the last word: templates and typed patterns serve other views too. |
| 160 | if ( ( is_singular() || did_action( 'template_redirect' ) ) && ! is_singular( $post_types ) ) { |
| 161 | return false; |
| 162 | } |
| 163 | |
| 164 | if ( $context instanceof \WP_Block_Template ) { |
| 165 | if ( 'wp_template' !== $context->type ) { |
| 166 | return false; |
| 167 | } |
| 168 | |
| 169 | if ( self::is_single_view_slug( (string) $context->slug, $post_types ) ) { |
| 170 | return true; |
| 171 | } |
| 172 | |
| 173 | // A custom template that declares no post types gets nothing, as with Newsletter's Subscribe block (see AGENTS.md). |
| 174 | return is_array( $context->post_types ) && (bool) array_intersect( $post_types, $context->post_types ); |
| 175 | } |
| 176 | |
| 177 | if ( is_array( $context ) ) { |
| 178 | $template_types = isset( $context['templateTypes'] ) && is_array( $context['templateTypes'] ) ? $context['templateTypes'] : array(); |
| 179 | |
| 180 | foreach ( $template_types as $template_type ) { |
| 181 | if ( is_string( $template_type ) && self::is_single_view_slug( $template_type, $post_types ) ) { |
| 182 | return true; |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | return is_singular( $post_types ); |
| 187 | } |
| 188 | |
| 189 | return false; |
| 190 | } |
| 191 | |
| 192 | /** |
| 193 | * Whether a template slug or type serves single views of one of the post types. |
| 194 | * |
| 195 | * @param string $slug Template slug. |
| 196 | * @param string[] $post_types Post types that get the blocks. |
| 197 | */ |
| 198 | private static function is_single_view_slug( string $slug, array $post_types ): bool { |
| 199 | if ( 'singular' === $slug ) { |
| 200 | return true; |
| 201 | } |
| 202 | |
| 203 | if ( in_array( 'page', $post_types, true ) && ( 'page' === $slug || str_starts_with( $slug, 'page-' ) ) ) { |
| 204 | return true; |
| 205 | } |
| 206 | |
| 207 | // Pages have templates of their own; `single` serves every other post type without one. |
| 208 | $single_types = array_diff( $post_types, array( 'page' ) ); |
| 209 | |
| 210 | if ( 'single' === $slug ) { |
| 211 | return (bool) $single_types; |
| 212 | } |
| 213 | |
| 214 | if ( ! str_starts_with( $slug, 'single-' ) ) { |
| 215 | return false; |
| 216 | } |
| 217 | |
| 218 | // `single-{type}` or one post's `single-{type}-{slug}`; post type names can hold hyphens, so the longest that fits owns it. |
| 219 | $rest = substr( $slug, strlen( 'single-' ) ); |
| 220 | $owner = ''; |
| 221 | |
| 222 | foreach ( array_unique( array_merge( array_values( get_post_types() ), $single_types ) ) as $post_type ) { |
| 223 | if ( strlen( $post_type ) > strlen( $owner ) && ( $rest === $post_type || str_starts_with( $rest, $post_type . '-' ) ) ) { |
| 224 | $owner = $post_type; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | return in_array( $owner, $single_types, true ); |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Whether the post being viewed, the template or the pattern already holds the block, as when the owner added it by hand. |
| 233 | * |
| 234 | * @param string $block Block type. |
| 235 | * @param mixed $context Template or pattern array, its content not yet hooked. |
| 236 | */ |
| 237 | private static function already_placed( string $block, $context ): bool { |
| 238 | $post = self::viewed_post(); |
| 239 | |
| 240 | if ( $post && has_block( $block, $post->post_content ) ) { |
| 241 | return true; |
| 242 | } |
| 243 | |
| 244 | if ( $context instanceof \WP_Block_Template ) { |
| 245 | $content = $context->content; |
| 246 | } else { |
| 247 | $content = $context['content'] ?? null; |
| 248 | $path = $context['filePath'] ?? null; |
| 249 | |
| 250 | // Core hands over a theme pattern before reading its file, the first time it is fetched. |
| 251 | if ( null === $content && is_string( $path ) && is_readable( $path ) ) { |
| 252 | $content = file_get_contents( $path ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- A local theme file. |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | return is_string( $content ) && has_block( $block, $content ); |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * Whether the post being viewed keeps the block out, as it would the legacy buttons. |
| 261 | * |
| 262 | * Its own switch can turn either off, Likes skip password-protected posts, and on Simple a post |
| 263 | * that switched Likes on keeps the legacy button. |
| 264 | * |
| 265 | * @param string $block Block type. |
| 266 | */ |
| 267 | private static function viewed_post_declines( string $block ): bool { |
| 268 | $post = self::viewed_post(); |
| 269 | |
| 270 | if ( ! $post || ! $post->ID ) { |
| 271 | return false; |
| 272 | } |
| 273 | |
| 274 | if ( Block_Names::SHARING_BUTTONS === $block ) { |
| 275 | return (bool) get_post_meta( $post->ID, Post_Sharing_Switch::META_KEY, false ); |
| 276 | } |
| 277 | |
| 278 | if ( '' !== $post->post_password ) { |
| 279 | return true; |
| 280 | } |
| 281 | |
| 282 | // Legacy Likes ignore a switch stored as an array. |
| 283 | $switched = get_post_meta( $post->ID, Post_Likes_Switch::META_KEY, true ); |
| 284 | $switched = is_scalar( $switched ) ? (string) $switched : ''; |
| 285 | |
| 286 | return '0' === $switched || ( '' !== $switched && Environment::is_simple_site() ); |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * The post a front-end singular request shows, if any. |
| 291 | */ |
| 292 | private static function viewed_post(): ?\WP_Post { |
| 293 | $post = is_singular() ? get_queried_object() : null; |
| 294 | |
| 295 | return $post instanceof \WP_Post ? $post : null; |
| 296 | } |
| 297 | |
| 298 | /** |
| 299 | * Whether Jetpack's blocks load here, so the lazy loader registers the hooked ones as they render. |
| 300 | * |
| 301 | * Asks for the conditions rather than the block registry: both blocks are only registered |
| 302 | * on first render on the front end, after core has built the template. |
| 303 | */ |
| 304 | private static function blocks_can_load(): bool { |
| 305 | return Environment::is_block_theme() && Environment::jetpack_blocks_load(); |
| 306 | } |
| 307 | |
| 308 | /** |
| 309 | * Whether the legacy feature shows no buttons, so visitors never get both. |
| 310 | * |
| 311 | * @param string $block Block type. |
| 312 | */ |
| 313 | private static function legacy_buttons_absent( string $block ): bool { |
| 314 | if ( Block_Names::SHARING_BUTTONS === $block ) { |
| 315 | return ! Environment::sharing_module_running() || Environment::legacy_sharing_switched_off(); |
| 316 | } |
| 317 | |
| 318 | return Environment::likes_supported() |
| 319 | && ( ! Environment::likes_module_running() || Environment::legacy_likes_switched_off() ); |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * Whether a hooked block sits right before or after the post content, where this class places it. |
| 324 | * |
| 325 | * @param mixed $relative_position Position relative to the anchor. |
| 326 | * @param mixed $parsed_anchor_block The anchor block. |
| 327 | */ |
| 328 | private static function is_content_placement( $relative_position, $parsed_anchor_block ): bool { |
| 329 | return is_array( $parsed_anchor_block ) |
| 330 | && self::ANCHOR === ( $parsed_anchor_block['blockName'] ?? null ) |
| 331 | && isset( self::POSITIONS[ $relative_position ] ); |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * Wrap a block in a `core/group` with the anchor's alignment and layout, so it lines up with the post content. |
| 336 | * |
| 337 | * @param array $block The hooked block. |
| 338 | * @param array $parsed_anchor_block The anchor block. |
| 339 | * @return array |
| 340 | */ |
| 341 | private static function wrap_in_group( array $block, array $parsed_anchor_block ): array { |
| 342 | $attrs = array(); |
| 343 | $class = 'wp-block-group'; |
| 344 | $align = $parsed_anchor_block['attrs']['align'] ?? null; |
| 345 | $layout = $parsed_anchor_block['attrs']['layout'] ?? null; |
| 346 | |
| 347 | // The group saves its alignment class, as its editor save output does. |
| 348 | if ( in_array( $align, self::ALIGNMENTS, true ) ) { |
| 349 | $attrs['align'] = $align; |
| 350 | $class .= ' align' . $align; |
| 351 | } |
| 352 | |
| 353 | if ( is_array( $layout ) && $layout ) { |
| 354 | $attrs['layout'] = $layout; |
| 355 | } |
| 356 | |
| 357 | return array( |
| 358 | 'blockName' => 'core/group', |
| 359 | 'attrs' => $attrs, |
| 360 | 'innerBlocks' => array( $block ), |
| 361 | 'innerHTML' => '<div class="' . $class . '"></div>', |
| 362 | 'innerContent' => array( '<div class="' . $class . '">', null, '</div>' ), |
| 363 | ); |
| 364 | } |
| 365 | } |