easy-markdown.php
| 1 | <?php //phpcs:ignore WordPress.Files.FileName.InvalidClassFileName |
| 2 | /** |
| 3 | * Plugin URI: https://automattic.com/ |
| 4 | * Plugin Name: Easy Markdown |
| 5 | * Description: Write in Markdown, publish in WordPress |
| 6 | * Version: 0.1 |
| 7 | * Author: Matt Wiebe |
| 8 | * Author URI: https://automattic.com/ |
| 9 | * Text Domain: jetpack |
| 10 | * |
| 11 | * @package automattic/jetpack |
| 12 | */ |
| 13 | |
| 14 | /** |
| 15 | * Copyright (c) Automattic. All rights reserved. |
| 16 | * |
| 17 | * Released under the GPL license |
| 18 | * https://www.opensource.org/licenses/gpl-license.php |
| 19 | * |
| 20 | * This is an add-on for WordPress |
| 21 | * https://wordpress.org/ |
| 22 | * |
| 23 | * ********************************************************************** |
| 24 | * This program is free software; you can redistribute it and/or modify |
| 25 | * it under the terms of the GNU General Public License as published by |
| 26 | * the Free Software Foundation; either version 2 of the License, or |
| 27 | * (at your option) any later version. |
| 28 | * |
| 29 | * This program is distributed in the hope that it will be useful, |
| 30 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 31 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 32 | * GNU General Public License for more details. |
| 33 | * ********************************************************************** |
| 34 | */ |
| 35 | |
| 36 | /** |
| 37 | * WPCom_Markdown class. |
| 38 | */ |
| 39 | class WPCom_Markdown { |
| 40 | |
| 41 | const POST_OPTION = 'wpcom_publish_posts_with_markdown'; |
| 42 | const COMMENT_OPTION = 'wpcom_publish_comments_with_markdown'; |
| 43 | const POST_TYPE_SUPPORT = 'wpcom-markdown'; |
| 44 | const IS_MD_META = '_wpcom_is_markdown'; |
| 45 | |
| 46 | /** |
| 47 | * Our markdown parser. |
| 48 | * |
| 49 | * @var WPCom_GHF_Markdown_Parser |
| 50 | */ |
| 51 | private static $parser; |
| 52 | |
| 53 | /** |
| 54 | * An instance of the markdown class. |
| 55 | * |
| 56 | * @var WPCom_Markdown |
| 57 | */ |
| 58 | private static $instance; |
| 59 | |
| 60 | /** |
| 61 | * To ensure that our munged posts over xml-rpc are removed from the cache. |
| 62 | * |
| 63 | * @var array |
| 64 | */ |
| 65 | public $posts_to_uncache = array(); |
| 66 | |
| 67 | /** |
| 68 | * Posts and parents to monitor. |
| 69 | * |
| 70 | * @var array |
| 71 | */ |
| 72 | private $monitoring = array( |
| 73 | 'post' => array(), |
| 74 | 'parent' => array(), |
| 75 | ); |
| 76 | |
| 77 | /** |
| 78 | * Whether or not kses filters were removed. Only set if removal was attempted. |
| 79 | * |
| 80 | * @var ?bool |
| 81 | */ |
| 82 | public $kses; |
| 83 | |
| 84 | /** |
| 85 | * Yay singletons! |
| 86 | * |
| 87 | * @return object WPCom_Markdown instance |
| 88 | */ |
| 89 | public static function get_instance() { |
| 90 | if ( ! self::$instance ) { |
| 91 | self::$instance = new self(); |
| 92 | } |
| 93 | return self::$instance; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Kicks things off on `init` action |
| 98 | */ |
| 99 | public function load() { |
| 100 | $this->add_default_post_type_support(); |
| 101 | $this->maybe_load_actions_and_filters(); |
| 102 | if ( defined( 'REST_API_REQUEST' ) && REST_API_REQUEST ) { |
| 103 | // phpcs:ignore WPCUT.SwitchBlog.SwitchBlog -- wpcom flags **every** use of switch_blog, apparently expecting valid instances to ignore or suppress the sniff. |
| 104 | add_action( 'switch_blog', array( $this, 'maybe_load_actions_and_filters' ), 10, 2 ); |
| 105 | } |
| 106 | add_action( 'admin_init', array( $this, 'register_setting' ) ); |
| 107 | add_action( 'admin_init', array( $this, 'maybe_unload_for_bulk_edit' ) ); |
| 108 | if ( current_theme_supports( 'o2' ) || class_exists( 'P2' ) ) { |
| 109 | $this->add_o2_helpers(); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * If we're in a bulk edit session, unload so that we don't lose our markdown metadata |
| 115 | */ |
| 116 | public function maybe_unload_for_bulk_edit() { |
| 117 | if ( isset( $_REQUEST['bulk_edit'] ) && $this->is_posting_enabled() ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
| 118 | $this->unload_markdown_for_posts(); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Called on init and fires on switch_blog to decide if our actions and filters |
| 124 | * should be running. |
| 125 | * |
| 126 | * @param int|null $new_blog_id New blog ID. |
| 127 | * @param int|null $old_blog_id Old blog ID. |
| 128 | * @return null |
| 129 | */ |
| 130 | public function maybe_load_actions_and_filters( $new_blog_id = null, $old_blog_id = null ) { |
| 131 | |
| 132 | // When WP sites are being installed, the options table is not available yet. |
| 133 | if ( function_exists( 'wp_installing' ) && wp_installing() ) { |
| 134 | return; |
| 135 | } |
| 136 | |
| 137 | // If this is a switch_to_blog call, and the blog isn't changing, we'll already be loaded. |
| 138 | if ( $new_blog_id && $new_blog_id === $old_blog_id ) { |
| 139 | return; |
| 140 | } |
| 141 | |
| 142 | if ( $this->is_posting_enabled() ) { |
| 143 | $this->load_markdown_for_posts(); |
| 144 | } else { |
| 145 | $this->unload_markdown_for_posts(); |
| 146 | } |
| 147 | |
| 148 | if ( $this->is_commenting_enabled() ) { |
| 149 | $this->load_markdown_for_comments(); |
| 150 | } else { |
| 151 | $this->unload_markdown_for_comments(); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Set up hooks for enabling Markdown conversion on posts |
| 157 | */ |
| 158 | public function load_markdown_for_posts() { |
| 159 | add_filter( 'wp_kses_allowed_html', array( $this, 'wp_kses_allowed_html' ), 10, 2 ); |
| 160 | add_action( 'after_wp_tiny_mce', array( $this, 'after_wp_tiny_mce' ) ); |
| 161 | add_action( 'wp_insert_post', array( $this, 'wp_insert_post' ) ); |
| 162 | add_filter( 'wp_insert_post_data', array( $this, 'wp_insert_post_data' ), 10, 2 ); |
| 163 | add_filter( 'edit_post_content', array( $this, 'edit_post_content' ), 10, 2 ); |
| 164 | add_filter( 'edit_post_content_filtered', array( $this, 'edit_post_content_filtered' ), 10, 2 ); |
| 165 | add_action( 'wp_restore_post_revision', array( $this, 'wp_restore_post_revision' ), 10, 2 ); |
| 166 | add_filter( '_wp_post_revision_fields', array( $this, 'wp_post_revision_fields' ) ); |
| 167 | add_action( 'xmlrpc_call', array( $this, 'xmlrpc_actions' ) ); |
| 168 | add_filter( 'content_save_pre', array( $this, 'preserve_code_blocks' ), 1 ); |
| 169 | if ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST ) { |
| 170 | $this->check_for_early_methods(); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * Removes hooks to disable Markdown conversion on posts |
| 176 | */ |
| 177 | public function unload_markdown_for_posts() { |
| 178 | remove_filter( 'wp_kses_allowed_html', array( $this, 'wp_kses_allowed_html' ) ); |
| 179 | remove_action( 'after_wp_tiny_mce', array( $this, 'after_wp_tiny_mce' ) ); |
| 180 | remove_action( 'wp_insert_post', array( $this, 'wp_insert_post' ) ); |
| 181 | remove_filter( 'wp_insert_post_data', array( $this, 'wp_insert_post_data' ), 10 ); |
| 182 | remove_filter( 'edit_post_content', array( $this, 'edit_post_content' ), 10 ); |
| 183 | remove_filter( 'edit_post_content_filtered', array( $this, 'edit_post_content_filtered' ), 10 ); |
| 184 | remove_action( 'wp_restore_post_revision', array( $this, 'wp_restore_post_revision' ), 10 ); |
| 185 | remove_filter( '_wp_post_revision_fields', array( $this, 'wp_post_revision_fields' ) ); |
| 186 | remove_action( 'xmlrpc_call', array( $this, 'xmlrpc_actions' ) ); |
| 187 | remove_filter( 'content_save_pre', array( $this, 'preserve_code_blocks' ), 1 ); |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * Set up hooks for enabling Markdown conversion on comments |
| 192 | */ |
| 193 | protected function load_markdown_for_comments() { |
| 194 | // Use priority 9 so that Markdown runs before KSES, which can clean up |
| 195 | // any munged HTML. |
| 196 | add_filter( 'pre_comment_content', array( $this, 'pre_comment_content' ), 9 ); |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Removes hooks to disable Markdown conversion |
| 201 | */ |
| 202 | protected function unload_markdown_for_comments() { |
| 203 | remove_filter( 'pre_comment_content', array( $this, 'pre_comment_content' ), 9 ); |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * The o2 plugin does some of what we do. Let's take precedence. |
| 208 | */ |
| 209 | public function add_o2_helpers() { |
| 210 | if ( $this->is_posting_enabled() ) { |
| 211 | add_filter( 'content_save_pre', array( $this, 'o2_escape_lists' ), 1 ); |
| 212 | } |
| 213 | |
| 214 | add_filter( 'o2_preview_post', array( $this, 'o2_preview_post' ) ); |
| 215 | add_filter( 'o2_preview_comment', array( $this, 'o2_preview_comment' ) ); |
| 216 | |
| 217 | add_filter( 'wpcom_markdown_transform_pre', array( $this, 'o2_unescape_lists' ) ); |
| 218 | add_filter( 'wpcom_untransformed_content', array( $this, 'o2_unescape_lists' ) ); |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * If Markdown is enabled for posts on this blog, filter the text for o2 previews |
| 223 | * |
| 224 | * @param string $text Post text. |
| 225 | * @return string Post text transformed through the magic of Markdown |
| 226 | */ |
| 227 | public function o2_preview_post( $text ) { |
| 228 | if ( $this->is_posting_enabled() ) { |
| 229 | $text = $this->transform( $text, array( 'unslash' => false ) ); |
| 230 | } |
| 231 | return $text; |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * If Markdown is enabled for comments on this blog, filter the text for o2 previews |
| 236 | * |
| 237 | * @param string $text Comment text. |
| 238 | * @return string Comment text transformed through the magic of Markdown |
| 239 | */ |
| 240 | public function o2_preview_comment( $text ) { |
| 241 | if ( $this->is_commenting_enabled() ) { |
| 242 | $text = $this->transform( $text, array( 'unslash' => false ) ); |
| 243 | } |
| 244 | return $text; |
| 245 | } |
| 246 | |
| 247 | /** |
| 248 | * Escapes lists so that o2 doesn't trounce them |
| 249 | * |
| 250 | * @param string $text Post/comment text. |
| 251 | * @return string Text escaped with HTML entity for asterisk. |
| 252 | */ |
| 253 | public function o2_escape_lists( $text ) { |
| 254 | return preg_replace( '/^\\* /um', '* ', $text ); |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Unescapes the token we inserted on o2_escape_lists |
| 259 | * |
| 260 | * @param string $text Post/comment text with HTML entities for asterisks. |
| 261 | * @return string Text with the HTML entity removed |
| 262 | */ |
| 263 | public function o2_unescape_lists( $text ) { |
| 264 | return preg_replace( '/^[&]\#042; /um', '* ', $text ); |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Preserve code blocks from being munged by KSES before they have a chance |
| 269 | * |
| 270 | * @param string $text post content. |
| 271 | * @return string post content with code blocks escaped. |
| 272 | */ |
| 273 | public function preserve_code_blocks( $text ) { |
| 274 | return $this->get_parser()->codeblock_preserve( $text ); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Remove KSES if it's there. Store the result to manually invoke later if needed. |
| 279 | */ |
| 280 | public function maybe_remove_kses() { |
| 281 | // Filters return true if they existed before you removed them. |
| 282 | if ( $this->is_posting_enabled() ) { |
| 283 | $this->kses = remove_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ) && remove_filter( 'content_save_pre', 'wp_filter_post_kses' ); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Add our Writing and Discussion settings. |
| 289 | */ |
| 290 | public function register_setting() { |
| 291 | add_settings_field( self::POST_OPTION, __( 'Markdown', 'jetpack' ), array( $this, 'post_field' ), 'writing' ); |
| 292 | register_setting( 'writing', self::POST_OPTION, array( $this, 'sanitize_setting' ) ); |
| 293 | add_settings_field( self::COMMENT_OPTION, __( 'Markdown', 'jetpack' ), array( $this, 'comment_field' ), 'discussion' ); |
| 294 | register_setting( 'discussion', self::COMMENT_OPTION, array( $this, 'sanitize_setting' ) ); |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * Sanitize setting. Don't really want to store "on" value, so we'll store "1" instead! |
| 299 | * |
| 300 | * @param string $input Value received by settings API via $_POST. |
| 301 | * @return bool Cast to boolean. |
| 302 | */ |
| 303 | public function sanitize_setting( $input ) { |
| 304 | return (bool) $input; |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * Prints HTML for the Writing setting |
| 309 | */ |
| 310 | public function post_field() { |
| 311 | printf( |
| 312 | '<label><input name="%1$s" id="%1$s" type="checkbox"%2$s /> %3$s</label><p class="description">%4$s</p>', |
| 313 | esc_attr( self::POST_OPTION ), |
| 314 | checked( $this->is_posting_enabled(), true, false ), |
| 315 | esc_html__( 'Use Markdown for posts and pages.', 'jetpack' ), |
| 316 | sprintf( '<a href="%s" data-target="wpcom-help-center">%s</a>', esc_url( $this->get_support_url() ), esc_html__( 'Learn more about Markdown.', 'jetpack' ) ) |
| 317 | ); |
| 318 | } |
| 319 | |
| 320 | /** |
| 321 | * Prints HTML for the Discussion setting |
| 322 | */ |
| 323 | public function comment_field() { |
| 324 | printf( |
| 325 | '<label><input name="%1$s" id="%1$s" type="checkbox"%2$s /> %3$s</label><p class="description">%4$s</p>', |
| 326 | esc_attr( self::COMMENT_OPTION ), |
| 327 | checked( $this->is_commenting_enabled(), true, false ), |
| 328 | esc_html__( 'Use Markdown for comments.', 'jetpack' ), |
| 329 | sprintf( '<a href="%s" data-target="wpcom-help-center">%s</a>', esc_url( $this->get_support_url() ), esc_html__( 'Learn more about Markdown.', 'jetpack' ) ) |
| 330 | ); |
| 331 | } |
| 332 | |
| 333 | /** |
| 334 | * Get the support url for Markdown |
| 335 | * |
| 336 | * @uses apply_filters |
| 337 | * @return string support url |
| 338 | */ |
| 339 | protected function get_support_url() { |
| 340 | /** |
| 341 | * Filter the Markdown support URL. |
| 342 | * |
| 343 | * @module markdown |
| 344 | * |
| 345 | * @since 2.8.0 |
| 346 | * |
| 347 | * @param string $url Markdown support URL. |
| 348 | */ |
| 349 | return apply_filters( 'easy_markdown_support_url', 'https://en.support.wordpress.com/markdown-quick-reference/' ); |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * Is Mardown conversion for posts enabled? |
| 354 | * |
| 355 | * @return boolean |
| 356 | */ |
| 357 | public function is_posting_enabled() { |
| 358 | return (bool) Jetpack_Options::get_option_and_ensure_autoload( self::POST_OPTION, '' ); |
| 359 | } |
| 360 | |
| 361 | /** |
| 362 | * Is Markdown conversion for comments enabled? |
| 363 | * |
| 364 | * @return boolean |
| 365 | */ |
| 366 | public function is_commenting_enabled() { |
| 367 | return (bool) Jetpack_Options::get_option_and_ensure_autoload( self::COMMENT_OPTION, '' ); |
| 368 | } |
| 369 | |
| 370 | /** |
| 371 | * Check if a $post_id has Markdown enabled |
| 372 | * |
| 373 | * @param int $post_id A post ID. |
| 374 | * @return boolean |
| 375 | */ |
| 376 | public function is_markdown( $post_id ) { |
| 377 | return get_metadata( 'post', $post_id, self::IS_MD_META, true ); |
| 378 | } |
| 379 | |
| 380 | /** |
| 381 | * Set Markdown as enabled on a post_id. We skip over update_postmeta so we |
| 382 | * can sneakily set metadata on post revisions, which we need. |
| 383 | * |
| 384 | * @param int $post_id A post ID. |
| 385 | * @return bool The metadata was successfully set. |
| 386 | */ |
| 387 | protected function set_as_markdown( $post_id ) { |
| 388 | return update_metadata( 'post', $post_id, self::IS_MD_META, true ); |
| 389 | } |
| 390 | |
| 391 | /** |
| 392 | * Get our Markdown parser object, optionally requiring all of our needed classes and |
| 393 | * instantiating our parser. |
| 394 | * |
| 395 | * @return object WPCom_GHF_Markdown_Parser instance. |
| 396 | */ |
| 397 | public function get_parser() { |
| 398 | |
| 399 | if ( ! self::$parser ) { |
| 400 | require_once JETPACK__PLUGIN_DIR . '/_inc/lib/markdown.php'; |
| 401 | self::$parser = new WPCom_GHF_Markdown_Parser(); |
| 402 | } |
| 403 | |
| 404 | return self::$parser; |
| 405 | } |
| 406 | |
| 407 | /** |
| 408 | * We don't want Markdown conversion all over the place. |
| 409 | */ |
| 410 | public function add_default_post_type_support() { |
| 411 | add_post_type_support( 'post', self::POST_TYPE_SUPPORT ); |
| 412 | add_post_type_support( 'page', self::POST_TYPE_SUPPORT ); |
| 413 | add_post_type_support( 'revision', self::POST_TYPE_SUPPORT ); |
| 414 | } |
| 415 | |
| 416 | /** |
| 417 | * Figure out the post type of the post screen we're on |
| 418 | * |
| 419 | * @deprecated since 10.8 |
| 420 | * @return string Current post_type |
| 421 | */ |
| 422 | protected function get_post_screen_post_type() { |
| 423 | _deprecated_function( __METHOD__, 'jetpack-10.8', '' ); |
| 424 | |
| 425 | global $pagenow; |
| 426 | $post_type = filter_input( INPUT_GET, 'post_type', FILTER_UNSAFE_RAW ); |
| 427 | $post_id = filter_input( INPUT_GET, 'post', FILTER_SANITIZE_NUMBER_INT ); |
| 428 | |
| 429 | if ( 'post-new.php' === $pagenow ) { |
| 430 | return ! empty( $post_type ) ? $post_type : 'post'; |
| 431 | } |
| 432 | |
| 433 | if ( $post_id ) { |
| 434 | $post_type = get_post_type( $post_id ); |
| 435 | } |
| 436 | |
| 437 | return ! empty( $post_type ) ? $post_type : 'post'; |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Swap post_content and post_content_filtered for editing |
| 442 | * |
| 443 | * @param string $content Post content. |
| 444 | * @param int $id post ID. |
| 445 | * @return string Swapped content |
| 446 | */ |
| 447 | public function edit_post_content( $content, $id ) { |
| 448 | if ( $this->is_markdown( $id ) ) { |
| 449 | $post = get_post( $id ); |
| 450 | if ( $post && ! empty( $post->post_content_filtered ) ) { |
| 451 | $post = $this->swap_for_editing( $post ); |
| 452 | return $post->post_content; |
| 453 | } |
| 454 | } |
| 455 | return $content; |
| 456 | } |
| 457 | |
| 458 | /** |
| 459 | * Swap post_content_filtered and post_content for editing |
| 460 | * |
| 461 | * @param string $content Post content_filtered. |
| 462 | * @param int $id post ID. |
| 463 | * @return string Swapped content |
| 464 | */ |
| 465 | public function edit_post_content_filtered( $content, $id ) { |
| 466 | // if markdown was disabled, let's turn this off. |
| 467 | if ( ! $this->is_posting_enabled() && $this->is_markdown( $id ) ) { |
| 468 | $post = get_post( $id ); |
| 469 | if ( $post && ! empty( $post->post_content_filtered ) ) { |
| 470 | $content = ''; |
| 471 | } |
| 472 | } |
| 473 | return $content; |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * Some tags are allowed to have a 'markdown' attribute, allowing them to contain Markdown. |
| 478 | * We need to tell KSES about those tags. |
| 479 | * |
| 480 | * @param array $tags List of tags that KSES allows. |
| 481 | * @param string $context The context that KSES is allowing these tags. |
| 482 | * @return array The tags that KSES allows, with our extra 'markdown' parameter where necessary. |
| 483 | */ |
| 484 | public function wp_kses_allowed_html( $tags, $context ) { |
| 485 | if ( 'post' !== $context ) { |
| 486 | return $tags; |
| 487 | } |
| 488 | |
| 489 | $re = '/' . $this->get_parser()->contain_span_tags_re . '/'; |
| 490 | foreach ( $tags as $tag => $attributes ) { |
| 491 | |
| 492 | // In case other filters have changed the value to a non-array, we skip it. |
| 493 | if ( ! is_array( $attributes ) ) { |
| 494 | continue; |
| 495 | } |
| 496 | |
| 497 | if ( preg_match( $re, $tag ) ) { |
| 498 | $attributes['markdown'] = true; |
| 499 | $tags[ $tag ] = $attributes; |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | return $tags; |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * TinyMCE needs to know not to strip the 'markdown' attribute. Unfortunately, it doesn't |
| 508 | * really offer a nice API for allowed attributes, so we have to manually add it |
| 509 | * to the schema instead. |
| 510 | */ |
| 511 | public function after_wp_tiny_mce() { |
| 512 | ?> |
| 513 | <script type="text/javascript"> |
| 514 | jQuery( function() { |
| 515 | ( 'undefined' !== typeof tinymce ) && tinymce.on( 'AddEditor', function( event ) { |
| 516 | event.editor.on( 'BeforeSetContent', function( event ) { |
| 517 | var editor = event.target; |
| 518 | Object.keys( editor.schema.elements ).forEach( function( key, index ) { |
| 519 | editor.schema.elements[ key ].attributes['markdown'] = {}; |
| 520 | editor.schema.elements[ key ].attributesOrder.push( 'markdown' ); |
| 521 | } ); |
| 522 | } ); |
| 523 | }, true ); |
| 524 | } ); |
| 525 | </script> |
| 526 | <?php |
| 527 | } |
| 528 | |
| 529 | /** |
| 530 | * Magic happens here. Markdown is converted and stored on post_content. Original Markdown is stored |
| 531 | * in post_content_filtered so that we can continue editing as Markdown. |
| 532 | * |
| 533 | * @param array $post_data The post data that will be inserted into the DB. Slashed. |
| 534 | * @param array $postarr All the stuff that was in $_POST. |
| 535 | * @return array $post_data with post_content and post_content_filtered modified |
| 536 | */ |
| 537 | public function wp_insert_post_data( $post_data, $postarr ) { |
| 538 | // $post_data array is slashed! |
| 539 | $post_id = isset( $postarr['ID'] ) ? $postarr['ID'] : false; |
| 540 | // bail early if markdown is disabled or this post type is unsupported. |
| 541 | if ( ! $this->is_posting_enabled() || ! post_type_supports( $post_data['post_type'], self::POST_TYPE_SUPPORT ) ) { |
| 542 | // it's disabled, but maybe this *was* a markdown post before. |
| 543 | if ( $this->is_markdown( $post_id ) && ! empty( $post_data['post_content_filtered'] ) ) { |
| 544 | $post_data['post_content_filtered'] = ''; |
| 545 | } |
| 546 | // we have no context to determine supported post types in the `post_content_pre` hook, |
| 547 | // which already ran to sanitize code blocks. Undo that. |
| 548 | $post_data['post_content'] = $this->get_parser()->codeblock_restore( $post_data['post_content'] ); |
| 549 | return $post_data; |
| 550 | } |
| 551 | // rejigger post_content and post_content_filtered |
| 552 | // revisions are already in the right place, except when we're restoring, but that's taken care of elsewhere |
| 553 | // also prevent quick edit feature from overriding already-saved markdown (issue https://github.com/Automattic/jetpack/issues/636). |
| 554 | if ( 'revision' !== $post_data['post_type'] && ! isset( $_POST['_inline_edit'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Missing |
| 555 | /** |
| 556 | * Filter the original post content passed to Markdown. |
| 557 | * |
| 558 | * @module markdown |
| 559 | * |
| 560 | * @since 2.8.0 |
| 561 | * |
| 562 | * @param string $post_data['post_content'] Untransformed post content. |
| 563 | */ |
| 564 | $post_data['post_content_filtered'] = apply_filters( 'wpcom_untransformed_content', $post_data['post_content'] ); |
| 565 | $post_data['post_content'] = $this->transform( $post_data['post_content'], array( 'id' => $post_id ) ); |
| 566 | /** This filter is already documented in core/wp-includes/default-filters.php */ |
| 567 | $post_data['post_content'] = apply_filters( 'content_save_pre', $post_data['post_content'] ); |
| 568 | } elseif ( str_starts_with( $post_data['post_name'], $post_data['post_parent'] . '-autosave' ) ) { |
| 569 | // autosaves for previews are weird. |
| 570 | /** This filter is already documented in modules/markdown/easy-markdown.php */ |
| 571 | $post_data['post_content_filtered'] = apply_filters( 'wpcom_untransformed_content', $post_data['post_content'] ); |
| 572 | $post_data['post_content'] = $this->transform( $post_data['post_content'], array( 'id' => $post_data['post_parent'] ) ); |
| 573 | /** This filter is already documented in core/wp-includes/default-filters.php */ |
| 574 | $post_data['post_content'] = apply_filters( 'content_save_pre', $post_data['post_content'] ); |
| 575 | } |
| 576 | |
| 577 | // set as markdown on the wp_insert_post hook later. |
| 578 | if ( $post_id ) { |
| 579 | $this->monitoring['post'][ $post_id ] = true; |
| 580 | } else { |
| 581 | $this->monitoring['content'] = wp_unslash( $post_data['post_content'] ); |
| 582 | } |
| 583 | if ( 'revision' === $postarr['post_type'] && $this->is_markdown( $postarr['post_parent'] ) ) { |
| 584 | $this->monitoring['parent'][ $postarr['post_parent'] ] = true; |
| 585 | } |
| 586 | |
| 587 | return $post_data; |
| 588 | } |
| 589 | |
| 590 | /** |
| 591 | * Calls on wp_insert_post action, after wp_insert_post_data. This way we can |
| 592 | * still set postmeta on our revisions after it's all been deleted. |
| 593 | * |
| 594 | * @param int $post_id The post ID that has just been added/updated. |
| 595 | */ |
| 596 | public function wp_insert_post( $post_id ) { |
| 597 | $post_parent = get_post_field( 'post_parent', $post_id ); |
| 598 | // this didn't have an ID yet. Compare the content that was just saved. |
| 599 | if ( isset( $this->monitoring['content'] ) && get_post_field( 'post_content', $post_id ) === $this->monitoring['content'] ) { |
| 600 | unset( $this->monitoring['content'] ); |
| 601 | $this->set_as_markdown( $post_id ); |
| 602 | } |
| 603 | if ( isset( $this->monitoring['post'][ $post_id ] ) ) { |
| 604 | unset( $this->monitoring['post'][ $post_id ] ); |
| 605 | $this->set_as_markdown( $post_id ); |
| 606 | } elseif ( isset( $this->monitoring['parent'][ $post_parent ] ) ) { |
| 607 | unset( $this->monitoring['parent'][ $post_parent ] ); |
| 608 | $this->set_as_markdown( $post_id ); |
| 609 | } |
| 610 | } |
| 611 | |
| 612 | /** |
| 613 | * Run a comment through Markdown. Easy peasy. |
| 614 | * |
| 615 | * @param string $content - the content. |
| 616 | * @return string |
| 617 | */ |
| 618 | public function pre_comment_content( $content ) { |
| 619 | return $this->transform( |
| 620 | $content, |
| 621 | array( |
| 622 | 'id' => $this->comment_hash( $content ), |
| 623 | ) |
| 624 | ); |
| 625 | } |
| 626 | |
| 627 | /** |
| 628 | * Return a comment hash. |
| 629 | * |
| 630 | * @param string $content - the content of the comment. |
| 631 | */ |
| 632 | protected function comment_hash( $content ) { |
| 633 | return 'c-' . substr( md5( $content ), 0, 8 ); |
| 634 | } |
| 635 | |
| 636 | /** |
| 637 | * Markdown conversion. Some DRYness for repetitive tasks. |
| 638 | * |
| 639 | * @param string $text Content to be run through Markdown. |
| 640 | * @param array $args Arguments, with keys: |
| 641 | * id: provide a string to prefix footnotes with a unique identifier |
| 642 | * unslash: when true, expects and returns slashed data |
| 643 | * decode_code_blocks: when true, assume that text in fenced code blocks is already |
| 644 | * HTML encoded and should be decoded before being passed to Markdown, which does |
| 645 | * its own encoding. |
| 646 | * @return string Markdown-processed content |
| 647 | */ |
| 648 | public function transform( $text, $args = array() ) { |
| 649 | // If this contains Gutenberg content, let's keep it intact. |
| 650 | if ( has_blocks( $text ) ) { |
| 651 | return $text; |
| 652 | } |
| 653 | |
| 654 | $args = wp_parse_args( |
| 655 | $args, |
| 656 | array( |
| 657 | 'id' => false, |
| 658 | 'unslash' => true, |
| 659 | 'decode_code_blocks' => ! $this->get_parser()->use_code_shortcode, |
| 660 | ) |
| 661 | ); |
| 662 | // probably need to unslash. |
| 663 | if ( $args['unslash'] ) { |
| 664 | $text = wp_unslash( $text ); |
| 665 | } |
| 666 | |
| 667 | /** |
| 668 | * Filter the content to be run through Markdown, before it's transformed by Markdown. |
| 669 | * |
| 670 | * @module markdown |
| 671 | * |
| 672 | * @since 2.8.0 |
| 673 | * |
| 674 | * @param string $text Content to be run through Markdown |
| 675 | * @param array $args Array of Markdown options. |
| 676 | */ |
| 677 | $text = apply_filters( 'wpcom_markdown_transform_pre', $text, $args ) ?? ''; |
| 678 | // ensure our paragraphs are separated. |
| 679 | $text = str_replace( array( '</p><p>', "</p>\n<p>" ), "</p>\n\n<p>", $text ); |
| 680 | // visual editor likes to add <p>s. Buh-bye. |
| 681 | $text = $this->get_parser()->unp( $text ); |
| 682 | // sometimes we get an encoded > at start of line, breaking blockquotes. |
| 683 | $text = preg_replace( '/^>/m', '>', $text ); |
| 684 | // prefixes are because we need to namespace footnotes by post_id. |
| 685 | $this->get_parser()->fn_id_prefix = $args['id'] ? $args['id'] . '-' : ''; |
| 686 | // If we're not using the code shortcode, prevent over-encoding. |
| 687 | if ( $args['decode_code_blocks'] ) { |
| 688 | $text = $this->get_parser()->codeblock_restore( $text ); |
| 689 | } |
| 690 | // Transform it! |
| 691 | $text = $this->get_parser()->transform( $text ); |
| 692 | // Fix footnotes - kses doesn't like the : IDs it supplies. |
| 693 | $text = preg_replace( '/((id|href)="#?fn(ref)?):/', '$1-', $text ); |
| 694 | // Markdown inserts extra spaces to make itself work. Buh-bye. |
| 695 | $text = rtrim( $text ); |
| 696 | /** |
| 697 | * Filter the content to be run through Markdown, after it was transformed by Markdown. |
| 698 | * |
| 699 | * @module markdown |
| 700 | * |
| 701 | * @since 2.8.0 |
| 702 | * |
| 703 | * @param string $text Content to be run through Markdown |
| 704 | * @param array $args Array of Markdown options. |
| 705 | */ |
| 706 | $text = apply_filters( 'wpcom_markdown_transform_post', $text, $args ); |
| 707 | |
| 708 | // probably need to re-slash. |
| 709 | if ( $args['unslash'] ) { |
| 710 | $text = wp_slash( $text ); |
| 711 | } |
| 712 | |
| 713 | return $text; |
| 714 | } |
| 715 | |
| 716 | /** |
| 717 | * Shows Markdown in the Revisions screen, and ensures that post_content_filtered |
| 718 | * is maintained on revisions |
| 719 | * |
| 720 | * @param array $fields Post fields pertinent to revisions. |
| 721 | */ |
| 722 | public function wp_post_revision_fields( $fields ) { |
| 723 | $fields['post_content_filtered'] = __( 'Markdown content', 'jetpack' ); |
| 724 | return $fields; |
| 725 | } |
| 726 | |
| 727 | /** |
| 728 | * Do some song and dance to keep all post_content and post_content_filtered content |
| 729 | * in the expected place when a post revision is restored. |
| 730 | * |
| 731 | * @param int $post_id The post ID have a restore done to it. |
| 732 | * @param int $revision_id The revision ID being restored. |
| 733 | */ |
| 734 | public function wp_restore_post_revision( $post_id, $revision_id ) { |
| 735 | if ( $this->is_markdown( $revision_id ) ) { |
| 736 | $revision = get_post( $revision_id, ARRAY_A ); |
| 737 | $post = get_post( $post_id, ARRAY_A ); |
| 738 | $post['post_content'] = $revision['post_content_filtered']; // Yes, we put it in post_content, because our wp_insert_post_data() expects that. |
| 739 | // set this flag so we can restore the post_content_filtered on the last revision later. |
| 740 | $this->monitoring['restore'] = true; |
| 741 | // let's not make a revision of our fixing update. |
| 742 | add_filter( 'wp_revisions_to_keep', '__return_false', 99 ); |
| 743 | wp_update_post( $post ); |
| 744 | $this->fix_latest_revision_on_restore( $post_id ); |
| 745 | remove_filter( 'wp_revisions_to_keep', '__return_false', 99 ); |
| 746 | } |
| 747 | } |
| 748 | |
| 749 | /** |
| 750 | * We need to ensure the last revision has Markdown, not HTML in its post_content_filtered |
| 751 | * column after a restore. |
| 752 | * |
| 753 | * @param int $post_id The post ID that was just restored. |
| 754 | */ |
| 755 | protected function fix_latest_revision_on_restore( $post_id ) { |
| 756 | global $wpdb; |
| 757 | $post = get_post( $post_id ); |
| 758 | $last_revision = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_type = 'revision' AND post_parent = %d ORDER BY ID DESC", $post->ID ) ); |
| 759 | $last_revision->post_content_filtered = $post->post_content_filtered; |
| 760 | wp_insert_post( (array) $last_revision ); |
| 761 | } |
| 762 | |
| 763 | /** |
| 764 | * Kicks off magic for an XML-RPC session. We want to keep editing Markdown |
| 765 | * and publishing HTML. |
| 766 | * |
| 767 | * @param string $xmlrpc_method The current XML-RPC method. |
| 768 | */ |
| 769 | public function xmlrpc_actions( $xmlrpc_method ) { |
| 770 | switch ( $xmlrpc_method ) { |
| 771 | case 'metaWeblog.getRecentPosts': |
| 772 | case 'wp.getPosts': |
| 773 | case 'wp.getPages': |
| 774 | add_action( 'parse_query', array( $this, 'make_filterable' ), 10, 1 ); |
| 775 | break; |
| 776 | case 'wp.getPost': |
| 777 | $this->prime_post_cache(); |
| 778 | break; |
| 779 | } |
| 780 | } |
| 781 | |
| 782 | /** |
| 783 | * Function metaWeblog.getPost and wp.getPage fire xmlrpc_call action *after* get_post() is called. |
| 784 | * So, we have to detect those methods and prime the post cache early. |
| 785 | * |
| 786 | * @return null |
| 787 | */ |
| 788 | protected function check_for_early_methods() { |
| 789 | $raw_post_data = file_get_contents( 'php://input' ); |
| 790 | if ( ! str_contains( $raw_post_data, 'metaWeblog.getPost' ) |
| 791 | && ! str_contains( $raw_post_data, 'wp.getPage' ) ) { |
| 792 | return; |
| 793 | } |
| 794 | include_once ABSPATH . WPINC . '/class-IXR.php'; |
| 795 | $message = new IXR_Message( $raw_post_data ); |
| 796 | $message->parse(); |
| 797 | $post_id_position = 'metaWeblog.getPost' === $message->methodName ? 0 : 1; // phpcs:ignore WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase |
| 798 | $this->prime_post_cache( $message->params[ $post_id_position ] ?? false ); |
| 799 | } |
| 800 | |
| 801 | /** |
| 802 | * Prime the post cache with swapped post_content. This is a sneaky way of getting around |
| 803 | * the fact that there are no good hooks to call on the *.getPost xmlrpc methods. |
| 804 | * |
| 805 | * @param bool $post_id - the post ID that we're priming. |
| 806 | */ |
| 807 | private function prime_post_cache( $post_id = false ) { |
| 808 | global $wp_xmlrpc_server; |
| 809 | if ( ! $post_id ) { |
| 810 | if ( isset( $wp_xmlrpc_server->message->params[3] ) ) { |
| 811 | $post_id = $wp_xmlrpc_server->message->params[3]; |
| 812 | } else { |
| 813 | return; // Exit early if we can't get a valid post_id |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | // prime the post cache. |
| 818 | if ( $this->is_markdown( $post_id ) ) { |
| 819 | $post = get_post( $post_id ); |
| 820 | if ( ! empty( $post->post_content_filtered ) ) { |
| 821 | wp_cache_delete( $post->ID, 'posts' ); |
| 822 | $post = $this->swap_for_editing( $post ); |
| 823 | wp_cache_add( $post->ID, $post, 'posts' ); |
| 824 | $this->posts_to_uncache[] = $post_id; |
| 825 | } |
| 826 | } |
| 827 | // uncache munged posts if using a persistent object cache. |
| 828 | if ( wp_using_ext_object_cache() ) { |
| 829 | add_action( 'shutdown', array( $this, 'uncache_munged_posts' ) ); |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | /** |
| 834 | * Swaps `post_content_filtered` back to `post_content` for editing purposes. |
| 835 | * |
| 836 | * @param object $post WP_Post object. |
| 837 | * @return object WP_Post object with swapped `post_content_filtered` and `post_content`. |
| 838 | */ |
| 839 | protected function swap_for_editing( $post ) { |
| 840 | $markdown = $post->post_content_filtered; |
| 841 | // unencode encoded code blocks. |
| 842 | $markdown = $this->get_parser()->codeblock_restore( $markdown ); |
| 843 | // restore beginning of line blockquotes. |
| 844 | $markdown = preg_replace( '/^> /m', '> ', $markdown ); |
| 845 | $post->post_content_filtered = $post->post_content; |
| 846 | $post->post_content = $markdown; |
| 847 | return $post; |
| 848 | } |
| 849 | |
| 850 | /** |
| 851 | * We munge the post cache to serve proper markdown content to XML-RPC clients. |
| 852 | * Uncache these after the XML-RPC session ends. |
| 853 | */ |
| 854 | public function uncache_munged_posts() { |
| 855 | // $this context gets lost in testing sometimes. Weird. |
| 856 | foreach ( self::get_instance()->posts_to_uncache as $post_id ) { |
| 857 | wp_cache_delete( $post_id, 'posts' ); |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | /** |
| 862 | * Since *.(get)?[Rr]ecentPosts calls get_posts with suppress filters on, we need to |
| 863 | * turn them back on so that we can swap things for editing. |
| 864 | * |
| 865 | * @param object $wp_query WP_Query object. |
| 866 | */ |
| 867 | public function make_filterable( $wp_query ) { |
| 868 | $wp_query->set( 'suppress_filters', false ); |
| 869 | add_action( 'the_posts', array( $this, 'the_posts' ), 10, 2 ); |
| 870 | } |
| 871 | |
| 872 | /** |
| 873 | * Swaps post_content and post_content_filtered for editing. |
| 874 | * |
| 875 | * @param array $posts Posts returned by the just-completed query. |
| 876 | * @return array Modified $posts |
| 877 | */ |
| 878 | public function the_posts( $posts ) { |
| 879 | foreach ( $posts as $key => $post ) { |
| 880 | if ( $this->is_markdown( $post->ID ) && ! empty( $posts[ $key ]->post_content_filtered ) ) { |
| 881 | $markdown = $posts[ $key ]->post_content_filtered; |
| 882 | $posts[ $key ]->post_content_filtered = $posts[ $key ]->post_content; |
| 883 | $posts[ $key ]->post_content = $markdown; |
| 884 | } |
| 885 | } |
| 886 | return $posts; |
| 887 | } |
| 888 | |
| 889 | /** |
| 890 | * Singleton silence is golden |
| 891 | */ |
| 892 | private function __construct() {} |
| 893 | } |
| 894 | |
| 895 | add_action( 'init', array( WPCom_Markdown::get_instance(), 'load' ) ); |
| 896 |