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Diffstat (limited to 'plugins/jetpack/modules/markdown/easy-markdown.php')
-rw-r--r-- | plugins/jetpack/modules/markdown/easy-markdown.php | 812 |
1 files changed, 812 insertions, 0 deletions
diff --git a/plugins/jetpack/modules/markdown/easy-markdown.php b/plugins/jetpack/modules/markdown/easy-markdown.php new file mode 100644 index 00000000..06a2cab9 --- /dev/null +++ b/plugins/jetpack/modules/markdown/easy-markdown.php @@ -0,0 +1,812 @@ +<?php + +/* +Plugin Name: Easy Markdown +Plugin URI: http://automattic.com/ +Description: Write in Markdown, publish in WordPress +Version: 0.1 +Author: Matt Wiebe +Author URI: http://automattic.com/ +*/ + +/** + * Copyright (c) Automattic. All rights reserved. + * + * Released under the GPL license + * http://www.opensource.org/licenses/gpl-license.php + * + * This is an add-on for WordPress + * https://wordpress.org/ + * + * ********************************************************************** + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * ********************************************************************** + */ + +class WPCom_Markdown { + + + const POST_OPTION = 'wpcom_publish_posts_with_markdown'; + const COMMENT_OPTION = 'wpcom_publish_comments_with_markdown'; + const POST_TYPE_SUPPORT = 'wpcom-markdown'; + const IS_MD_META = '_wpcom_is_markdown'; + + private static $parser; + private static $instance; + + // to ensure that our munged posts over xml-rpc are removed from the cache + public $posts_to_uncache = array(); + private $monitoring = array( 'post' => array(), 'parent' => array() ); + + + /** + * Yay singletons! + * @return object WPCom_Markdown instance + */ + public static function get_instance() { + if ( ! self::$instance ) + self::$instance = new self(); + return self::$instance; + } + + /** + * Kicks things off on `init` action + * @return null + */ + public function load() { + $this->add_default_post_type_support(); + $this->maybe_load_actions_and_filters(); + if ( defined( 'REST_API_REQUEST' ) && REST_API_REQUEST ) { + add_action( 'switch_blog', array( $this, 'maybe_load_actions_and_filters' ), 10, 2 ); + } + add_action( 'admin_init', array( $this, 'register_setting' ) ); + add_action( 'admin_init', array( $this, 'maybe_unload_for_bulk_edit' ) ); + if ( current_theme_supports( 'o2' ) || class_exists( 'P2' ) ) { + $this->add_o2_helpers(); + } + } + + /** + * If we're in a bulk edit session, unload so that we don't lose our markdown metadata + * @return null + */ + public function maybe_unload_for_bulk_edit() { + if ( isset( $_REQUEST['bulk_edit'] ) && $this->is_posting_enabled() ) { + $this->unload_markdown_for_posts(); + } + } + + /** + * Called on init and fires on switch_blog to decide if our actions and filters + * should be running. + * @param int|null $new_blog_id New blog ID + * @param int|null $old_blog_id Old blog ID + * @return null + */ + public function maybe_load_actions_and_filters( $new_blog_id = null, $old_blog_id = null ) { + // If this is a switch_to_blog call, and the blog isn't changing, we'll already be loaded + if ( $new_blog_id && $new_blog_id === $old_blog_id ) { + return; + } + + if ( $this->is_posting_enabled() ) { + $this->load_markdown_for_posts(); + } else { + $this->unload_markdown_for_posts(); + } + + if ( $this->is_commenting_enabled() ) { + $this->load_markdown_for_comments(); + } else { + $this->unload_markdown_for_comments(); + } + } + + /** + * Set up hooks for enabling Markdown conversion on posts + * @return null + */ + public function load_markdown_for_posts() { + add_filter( 'wp_kses_allowed_html', array( $this, 'wp_kses_allowed_html' ), 10, 2 ); + add_action( 'after_wp_tiny_mce', array( $this, 'after_wp_tiny_mce' ) ); + add_action( 'wp_insert_post', array( $this, 'wp_insert_post' ) ); + add_filter( 'wp_insert_post_data', array( $this, 'wp_insert_post_data' ), 10, 2 ); + add_filter( 'edit_post_content', array( $this, 'edit_post_content' ), 10, 2 ); + add_filter( 'edit_post_content_filtered', array( $this, 'edit_post_content_filtered' ), 10, 2 ); + add_action( 'wp_restore_post_revision', array( $this, 'wp_restore_post_revision' ), 10, 2 ); + add_filter( '_wp_post_revision_fields', array( $this, '_wp_post_revision_fields' ) ); + add_action( 'xmlrpc_call', array( $this, 'xmlrpc_actions' ) ); + add_filter( 'content_save_pre', array( $this, 'preserve_code_blocks' ), 1 ); + if ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST ) { + $this->check_for_early_methods(); + } + } + + /** + * Removes hooks to disable Markdown conversion on posts + * @return null + */ + public function unload_markdown_for_posts() { + remove_filter( 'wp_kses_allowed_html', array( $this, 'wp_kses_allowed_html' ) ); + remove_action( 'after_wp_tiny_mce', array( $this, 'after_wp_tiny_mce' ) ); + remove_action( 'wp_insert_post', array( $this, 'wp_insert_post' ) ); + remove_filter( 'wp_insert_post_data', array( $this, 'wp_insert_post_data' ), 10, 2 ); + remove_filter( 'edit_post_content', array( $this, 'edit_post_content' ), 10, 2 ); + remove_filter( 'edit_post_content_filtered', array( $this, 'edit_post_content_filtered' ), 10, 2 ); + remove_action( 'wp_restore_post_revision', array( $this, 'wp_restore_post_revision' ), 10, 2 ); + remove_filter( '_wp_post_revision_fields', array( $this, '_wp_post_revision_fields' ) ); + remove_action( 'xmlrpc_call', array( $this, 'xmlrpc_actions' ) ); + remove_filter( 'content_save_pre', array( $this, 'preserve_code_blocks' ), 1 ); + } + + /** + * Set up hooks for enabling Markdown conversion on comments + * @return null + */ + protected function load_markdown_for_comments() { + // Use priority 9 so that Markdown runs before KSES, which can clean up + // any munged HTML. + add_filter( 'pre_comment_content', array( $this, 'pre_comment_content' ), 9 ); + } + + /** + * Removes hooks to disable Markdown conversion + * @return null + */ + protected function unload_markdown_for_comments() { + remove_filter( 'pre_comment_content', array( $this, 'pre_comment_content' ), 9 ); + } + + /** + * o2 does some of what we do. Let's take precedence. + * @return null + */ + public function add_o2_helpers() { + if ( $this->is_posting_enabled() ) { + add_filter( 'content_save_pre', array( $this, 'o2_escape_lists' ), 1 ); + } + + add_filter( 'o2_preview_post', array( $this, 'o2_preview_post' ) ); + add_filter( 'o2_preview_comment', array( $this, 'o2_preview_comment' ) ); + + add_filter( 'wpcom_markdown_transform_pre', array( $this, 'o2_unescape_lists' ) ); + add_filter( 'wpcom_untransformed_content', array( $this, 'o2_unescape_lists' ) ); + } + + /** + * If Markdown is enabled for posts on this blog, filter the text for o2 previews + * @param string $text Post text + * @return string Post text transformed through the magic of Markdown + */ + public function o2_preview_post( $text ) { + if ( $this->is_posting_enabled() ) { + $text = $this->transform( $text, array( 'unslash' => false ) ); + } + return $text; + } + + /** + * If Markdown is enabled for comments on this blog, filter the text for o2 previews + * @param string $text Comment text + * @return string Comment text transformed through the magic of Markdown + */ + public function o2_preview_comment( $text ) { + if ( $this->is_commenting_enabled() ) { + $text = $this->transform( $text, array( 'unslash' => false ) ); + } + return $text; + } + + /** + * Escapes lists so that o2 doesn't trounce them + * @param string $text Post/comment text + * @return string Text escaped with HTML entity for asterisk + */ + public function o2_escape_lists( $text ) { + return preg_replace( '/^\\* /um', '* ', $text ); + } + + /** + * Unescapes the token we inserted on o2_escape_lists + * @param string $text Post/comment text with HTML entities for asterisks + * @return string Text with the HTML entity removed + */ + public function o2_unescape_lists( $text ) { + return preg_replace( '/^[&]\#042; /um', '* ', $text ); + } + + /** + * Preserve code blocks from being munged by KSES before they have a chance + * @param string $text post content + * @return string post content with code blocks escaped + */ + public function preserve_code_blocks( $text ) { + return $this->get_parser()->codeblock_preserve( $text ); + } + + /** + * Remove KSES if it's there. Store the result to manually invoke later if needed. + * @return null + */ + public function maybe_remove_kses() { + // Filters return true if they existed before you removed them + if ( $this->is_posting_enabled() ) + $this->kses = remove_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ) && remove_filter( 'content_save_pre', 'wp_filter_post_kses' ); + } + + /** + * Add our Writing and Discussion settings. + * @return null + */ + public function register_setting() { + add_settings_field( self::POST_OPTION, __( 'Markdown', 'jetpack' ), array( $this, 'post_field' ), 'writing' ); + register_setting( 'writing', self::POST_OPTION, array( $this, 'sanitize_setting') ); + add_settings_field( self::COMMENT_OPTION, __( 'Markdown', 'jetpack' ), array( $this, 'comment_field' ), 'discussion' ); + register_setting( 'discussion', self::COMMENT_OPTION, array( $this, 'sanitize_setting') ); + } + + /** + * Sanitize setting. Don't really want to store "on" value, so we'll store "1" instead! + * @param string $input Value received by settings API via $_POST + * @return bool Cast to boolean. + */ + public function sanitize_setting( $input ) { + return (bool) $input; + } + + /** + * Prints HTML for the Writing setting + * @return null + */ + public function post_field() { + printf( + '<label><input name="%s" id="%s" type="checkbox"%s /> %s</label><p class="description">%s</p>', + self::POST_OPTION, + self::POST_OPTION, + checked( $this->is_posting_enabled(), true, false ), + esc_html__( 'Use Markdown for posts and pages.', 'jetpack' ), + sprintf( '<a href="%s">%s</a>', esc_url( $this->get_support_url() ), esc_html__( 'Learn more about Markdown.', 'jetpack' ) ) + ); + } + + /** + * Prints HTML for the Discussion setting + * @return null + */ + public function comment_field() { + printf( + '<label><input name="%s" id="%s" type="checkbox"%s /> %s</label><p class="description">%s</p>', + self::COMMENT_OPTION, + self::COMMENT_OPTION, + checked( $this->is_commenting_enabled(), true, false ), + esc_html__( 'Use Markdown for comments.', 'jetpack' ), + sprintf( '<a href="%s">%s</a>', esc_url( $this->get_support_url() ), esc_html__( 'Learn more about Markdown.', 'jetpack' ) ) + ); + } + + /** + * Get the support url for Markdown + * @uses apply_filters + * @return string support url + */ + protected function get_support_url() { + /** + * Filter the Markdown support URL. + * + * @module markdown + * + * @since 2.8.0 + * + * @param string $url Markdown support URL. + */ + return apply_filters( 'easy_markdown_support_url', 'http://en.support.wordpress.com/markdown-quick-reference/' ); + } + + /** + * Is Mardown conversion for posts enabled? + * @return boolean + */ + public function is_posting_enabled() { + return (bool) Jetpack_Options::get_option_and_ensure_autoload( self::POST_OPTION, '' ); + } + + /** + * Is Markdown conversion for comments enabled? + * @return boolean + */ + public function is_commenting_enabled() { + return (bool) Jetpack_Options::get_option_and_ensure_autoload( self::COMMENT_OPTION, '' ); + } + + /** + * Check if a $post_id has Markdown enabled + * @param int $post_id A post ID. + * @return boolean + */ + public function is_markdown( $post_id ) { + return get_metadata( 'post', $post_id, self::IS_MD_META, true ); + } + + /** + * Set Markdown as enabled on a post_id. We skip over update_postmeta so we + * can sneakily set metadata on post revisions, which we need. + * @param int $post_id A post ID. + * @return bool The metadata was successfully set. + */ + protected function set_as_markdown( $post_id ) { + return update_metadata( 'post', $post_id, self::IS_MD_META, true ); + } + + /** + * Get our Markdown parser object, optionally requiring all of our needed classes and + * instantiating our parser. + * @return object WPCom_GHF_Markdown_Parser instance. + */ + public function get_parser() { + + if ( ! self::$parser ) { + jetpack_require_lib( 'markdown' ); + self::$parser = new WPCom_GHF_Markdown_Parser; + } + + return self::$parser; + } + + /** + * We don't want Markdown conversion all over the place. + * @return null + */ + public function add_default_post_type_support() { + add_post_type_support( 'post', self::POST_TYPE_SUPPORT ); + add_post_type_support( 'page', self::POST_TYPE_SUPPORT ); + add_post_type_support( 'revision', self::POST_TYPE_SUPPORT ); + } + + /** + * Figure out the post type of the post screen we're on + * @return string Current post_type + */ + protected function get_post_screen_post_type() { + global $pagenow; + if ( 'post-new.php' === $pagenow ) + return ( isset( $_GET['post_type'] ) ) ? $_GET['post_type'] : 'post'; + if ( isset( $_GET['post'] ) ) { + $post = get_post( (int) $_GET['post'] ); + if ( is_object( $post ) && isset( $post->post_type ) ) + return $post->post_type; + } + return 'post'; + } + + /** + * Swap post_content and post_content_filtered for editing + * @param string $content Post content + * @param int $id post ID + * @return string Swapped content + */ + public function edit_post_content( $content, $id ) { + if ( $this->is_markdown( $id ) ) { + $post = get_post( $id ); + if ( $post && ! empty( $post->post_content_filtered ) ) { + $post = $this->swap_for_editing( $post ); + return $post->post_content; + } + } + return $content; + } + + /** + * Swap post_content_filtered and post_content for editing + * @param string $content Post content_filtered + * @param int $id post ID + * @return string Swapped content + */ + public function edit_post_content_filtered( $content, $id ) { + // if markdown was disabled, let's turn this off + if ( ! $this->is_posting_enabled() && $this->is_markdown( $id ) ) { + $post = get_post( $id ); + if ( $post && ! empty( $post->post_content_filtered ) ) + $content = ''; + } + return $content; + } + + /** + * Some tags are allowed to have a 'markdown' attribute, allowing them to contain Markdown. + * We need to tell KSES about those tags. + * @param array $tags List of tags that KSES allows. + * @param string $context The context that KSES is allowing these tags. + * @return array The tags that KSES allows, with our extra 'markdown' parameter where necessary. + */ + public function wp_kses_allowed_html( $tags, $context ) { + if ( 'post' !== $context ) { + return $tags; + } + + $re = '/' . $this->get_parser()->contain_span_tags_re . '/'; + foreach ( $tags as $tag => $attributes ) { + if ( preg_match( $re, $tag ) ) { + $attributes['markdown'] = true; + $tags[ $tag ] = $attributes; + } + } + + return $tags; + } + + /** + * TinyMCE needs to know not to strip the 'markdown' attribute. Unfortunately, it doesn't + * really offer a nice API for whitelisting attributes, so we have to manually add it + * to the schema instead. + */ + public function after_wp_tiny_mce() { +?> +<script type="text/javascript"> +jQuery( function() { + ( 'undefined' !== typeof tinymce ) && tinymce.on( 'AddEditor', function( event ) { + event.editor.on( 'BeforeSetContent', function( event ) { + var editor = event.target; + Object.keys( editor.schema.elements ).forEach( function( key, index ) { + editor.schema.elements[ key ].attributes['markdown'] = {}; + editor.schema.elements[ key ].attributesOrder.push( 'markdown' ); + } ); + } ); + }, true ); +} ); +</script> +<?php + } + + /** + * Magic happens here. Markdown is converted and stored on post_content. Original Markdown is stored + * in post_content_filtered so that we can continue editing as Markdown. + * @param array $post_data The post data that will be inserted into the DB. Slashed. + * @param array $postarr All the stuff that was in $_POST. + * @return array $post_data with post_content and post_content_filtered modified + */ + public function wp_insert_post_data( $post_data, $postarr ) { + // $post_data array is slashed! + $post_id = isset( $postarr['ID'] ) ? $postarr['ID'] : false; + // bail early if markdown is disabled or this post type is unsupported. + if ( ! $this->is_posting_enabled() || ! post_type_supports( $post_data['post_type'], self::POST_TYPE_SUPPORT ) ) { + // it's disabled, but maybe this *was* a markdown post before. + if ( $this->is_markdown( $post_id ) && ! empty( $post_data['post_content_filtered'] ) ) { + $post_data['post_content_filtered'] = ''; + } + // we have no context to determine supported post types in the `post_content_pre` hook, + // which already ran to sanitize code blocks. Undo that. + $post_data['post_content'] = $this->get_parser()->codeblock_restore( $post_data['post_content'] ); + return $post_data; + } + // rejigger post_content and post_content_filtered + // revisions are already in the right place, except when we're restoring, but that's taken care of elsewhere + // also prevent quick edit feature from overriding already-saved markdown (issue https://github.com/Automattic/jetpack/issues/636) + if ( 'revision' !== $post_data['post_type'] && ! isset( $_POST['_inline_edit'] ) ) { + /** + * Filter the original post content passed to Markdown. + * + * @module markdown + * + * @since 2.8.0 + * + * @param string $post_data['post_content'] Untransformed post content. + */ + $post_data['post_content_filtered'] = apply_filters( 'wpcom_untransformed_content', $post_data['post_content'] ); + $post_data['post_content'] = $this->transform( $post_data['post_content'], array( 'id' => $post_id ) ); + /** This filter is already documented in core/wp-includes/default-filters.php */ + $post_data['post_content'] = apply_filters( 'content_save_pre', $post_data['post_content'] ); + } elseif ( 0 === strpos( $post_data['post_name'], $post_data['post_parent'] . '-autosave' ) ) { + // autosaves for previews are weird + /** This filter is already documented in modules/markdown/easy-markdown.php */ + $post_data['post_content_filtered'] = apply_filters( 'wpcom_untransformed_content', $post_data['post_content'] ); + $post_data['post_content'] = $this->transform( $post_data['post_content'], array( 'id' => $post_data['post_parent'] ) ); + /** This filter is already documented in core/wp-includes/default-filters.php */ + $post_data['post_content'] = apply_filters( 'content_save_pre', $post_data['post_content'] ); + } + + // set as markdown on the wp_insert_post hook later + if ( $post_id ) + $this->monitoring['post'][ $post_id ] = true; + else + $this->monitoring['content'] = wp_unslash( $post_data['post_content'] ); + if ( 'revision' === $postarr['post_type'] && $this->is_markdown( $postarr['post_parent'] ) ) + $this->monitoring['parent'][ $postarr['post_parent'] ] = true; + + return $post_data; + } + + /** + * Calls on wp_insert_post action, after wp_insert_post_data. This way we can + * still set postmeta on our revisions after it's all been deleted. + * @param int $post_id The post ID that has just been added/updated + * @return null + */ + public function wp_insert_post( $post_id ) { + $post_parent = get_post_field( 'post_parent', $post_id ); + // this didn't have an ID yet. Compare the content that was just saved. + if ( isset( $this->monitoring['content'] ) && $this->monitoring['content'] === get_post_field( 'post_content', $post_id ) ) { + unset( $this->monitoring['content'] ); + $this->set_as_markdown( $post_id ); + } + if ( isset( $this->monitoring['post'][$post_id] ) ) { + unset( $this->monitoring['post'][$post_id] ); + $this->set_as_markdown( $post_id ); + } elseif ( isset( $this->monitoring['parent'][$post_parent] ) ) { + unset( $this->monitoring['parent'][$post_parent] ); + $this->set_as_markdown( $post_id ); + } + } + + /** + * Run a comment through Markdown. Easy peasy. + * @param string $content + * @return string + */ + public function pre_comment_content( $content ) { + return $this->transform( $content, array( + 'id' => $this->comment_hash( $content ), + ) ); + } + + protected function comment_hash( $content ) { + return 'c-' . substr( md5( $content ), 0, 8 ); + } + + /** + * Markdown conversion. Some DRYness for repetitive tasks. + * @param string $text Content to be run through Markdown + * @param array $args Arguments, with keys: + * id: provide a string to prefix footnotes with a unique identifier + * unslash: when true, expects and returns slashed data + * decode_code_blocks: when true, assume that text in fenced code blocks is already + * HTML encoded and should be decoded before being passed to Markdown, which does + * its own encoding. + * @return string Markdown-processed content + */ + public function transform( $text, $args = array() ) { + // If this contains Gutenberg content, let's keep it intact. + if ( has_blocks( $text ) ) { + return $text; + } + + $args = wp_parse_args( $args, array( + 'id' => false, + 'unslash' => true, + 'decode_code_blocks' => ! $this->get_parser()->use_code_shortcode + ) ); + // probably need to unslash + if ( $args['unslash'] ) + $text = wp_unslash( $text ); + + /** + * Filter the content to be run through Markdown, before it's transformed by Markdown. + * + * @module markdown + * + * @since 2.8.0 + * + * @param string $text Content to be run through Markdown + * @param array $args Array of Markdown options. + */ + $text = apply_filters( 'wpcom_markdown_transform_pre', $text, $args ); + // ensure our paragraphs are separated + $text = str_replace( array( '</p><p>', "</p>\n<p>" ), "</p>\n\n<p>", $text ); + // visual editor likes to add <p>s. Buh-bye. + $text = $this->get_parser()->unp( $text ); + // sometimes we get an encoded > at start of line, breaking blockquotes + $text = preg_replace( '/^>/m', '>', $text ); + // prefixes are because we need to namespace footnotes by post_id + $this->get_parser()->fn_id_prefix = $args['id'] ? $args['id'] . '-' : ''; + // If we're not using the code shortcode, prevent over-encoding. + if ( $args['decode_code_blocks'] ) { + $text = $this->get_parser()->codeblock_restore( $text ); + } + // Transform it! + $text = $this->get_parser()->transform( $text ); + // Fix footnotes - kses doesn't like the : IDs it supplies + $text = preg_replace( '/((id|href)="#?fn(ref)?):/', "$1-", $text ); + // Markdown inserts extra spaces to make itself work. Buh-bye. + $text = rtrim( $text ); + /** + * Filter the content to be run through Markdown, after it was transformed by Markdown. + * + * @module markdown + * + * @since 2.8.0 + * + * @param string $text Content to be run through Markdown + * @param array $args Array of Markdown options. + */ + $text = apply_filters( 'wpcom_markdown_transform_post', $text, $args ); + + // probably need to re-slash + if ( $args['unslash'] ) + $text = wp_slash( $text ); + + return $text; + } + + /** + * Shows Markdown in the Revisions screen, and ensures that post_content_filtered + * is maintained on revisions + * @param array $fields Post fields pertinent to revisions + * @return array Modified array to include post_content_filtered + */ + public function _wp_post_revision_fields( $fields ) { + $fields['post_content_filtered'] = __( 'Markdown content', 'jetpack' ); + return $fields; + } + + /** + * Do some song and dance to keep all post_content and post_content_filtered content + * in the expected place when a post revision is restored. + * @param int $post_id The post ID have a restore done to it + * @param int $revision_id The revision ID being restored + * @return null + */ + public function wp_restore_post_revision( $post_id, $revision_id ) { + if ( $this->is_markdown( $revision_id ) ) { + $revision = get_post( $revision_id, ARRAY_A ); + $post = get_post( $post_id, ARRAY_A ); + $post['post_content'] = $revision['post_content_filtered']; // Yes, we put it in post_content, because our wp_insert_post_data() expects that + // set this flag so we can restore the post_content_filtered on the last revision later + $this->monitoring['restore'] = true; + // let's not make a revision of our fixing update + add_filter( 'wp_revisions_to_keep', '__return_false', 99 ); + wp_update_post( $post ); + $this->fix_latest_revision_on_restore( $post_id ); + remove_filter( 'wp_revisions_to_keep', '__return_false', 99 ); + } + } + + /** + * We need to ensure the last revision has Markdown, not HTML in its post_content_filtered + * column after a restore. + * @param int $post_id The post ID that was just restored. + * @return null + */ + protected function fix_latest_revision_on_restore( $post_id ) { + global $wpdb; + $post = get_post( $post_id ); + $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 ) ); + $last_revision->post_content_filtered = $post->post_content_filtered; + wp_insert_post( (array) $last_revision ); + } + + /** + * Kicks off magic for an XML-RPC session. We want to keep editing Markdown + * and publishing HTML. + * @param string $xmlrpc_method The current XML-RPC method + * @return null + */ + public function xmlrpc_actions( $xmlrpc_method ) { + switch ( $xmlrpc_method ) { + case 'metaWeblog.getRecentPosts': + case 'wp.getPosts': + case 'wp.getPages': + add_action( 'parse_query', array( $this, 'make_filterable' ), 10, 1 ); + break; + case 'wp.getPost': + $this->prime_post_cache(); + break; + } + } + + /** + * metaWeblog.getPost and wp.getPage fire xmlrpc_call action *after* get_post() is called. + * So, we have to detect those methods and prime the post cache early. + * @return null + */ + protected function check_for_early_methods() { + $raw_post_data = file_get_contents( "php://input" ); + if ( false === strpos( $raw_post_data, 'metaWeblog.getPost' ) + && false === strpos( $raw_post_data, 'wp.getPage' ) ) { + return; + } + include_once( ABSPATH . WPINC . '/class-IXR.php' ); + $message = new IXR_Message( $raw_post_data ); + $message->parse(); + $post_id_position = 'metaWeblog.getPost' === $message->methodName ? 0 : 1; + $this->prime_post_cache( $message->params[ $post_id_position ] ); + } + + /** + * Prime the post cache with swapped post_content. This is a sneaky way of getting around + * the fact that there are no good hooks to call on the *.getPost xmlrpc methods. + * + * @return null + */ + private function prime_post_cache( $post_id = false ) { + global $wp_xmlrpc_server; + if ( ! $post_id ) { + $post_id = $wp_xmlrpc_server->message->params[3]; + } + + // prime the post cache + if ( $this->is_markdown( $post_id ) ) { + $post = get_post( $post_id ); + if ( ! empty( $post->post_content_filtered ) ) { + wp_cache_delete( $post->ID, 'posts' ); + $post = $this->swap_for_editing( $post ); + wp_cache_add( $post->ID, $post, 'posts' ); + $this->posts_to_uncache[] = $post_id; + } + } + // uncache munged posts if using a persistent object cache + if ( wp_using_ext_object_cache() ) { + add_action( 'shutdown', array( $this, 'uncache_munged_posts' ) ); + } + } + + /** + * Swaps `post_content_filtered` back to `post_content` for editing purposes. + * @param object $post WP_Post object + * @return object WP_Post object with swapped `post_content_filtered` and `post_content` + */ + protected function swap_for_editing( $post ) { + $markdown = $post->post_content_filtered; + // unencode encoded code blocks + $markdown = $this->get_parser()->codeblock_restore( $markdown ); + // restore beginning of line blockquotes + $markdown = preg_replace( '/^> /m', '> ', $markdown ); + $post->post_content_filtered = $post->post_content; + $post->post_content = $markdown; + return $post; + } + + + /** + * We munge the post cache to serve proper markdown content to XML-RPC clients. + * Uncache these after the XML-RPC session ends. + * @return null + */ + public function uncache_munged_posts() { + // $this context gets lost in testing sometimes. Weird. + foreach( WPCom_Markdown::get_instance()->posts_to_uncache as $post_id ) { + wp_cache_delete( $post_id, 'posts' ); + } + } + + /** + * Since *.(get)?[Rr]ecentPosts calls get_posts with suppress filters on, we need to + * turn them back on so that we can swap things for editing. + * @param object $wp_query WP_Query object + * @return null + */ + public function make_filterable( $wp_query ) { + $wp_query->set( 'suppress_filters', false ); + add_action( 'the_posts', array( $this, 'the_posts' ), 10, 2 ); + } + + /** + * Swaps post_content and post_content_filtered for editing. + * @param array $posts Posts returned by the just-completed query + * @param object $wp_query Current WP_Query object + * @return array Modified $posts + */ + public function the_posts( $posts, $wp_query ) { + foreach ( $posts as $key => $post ) { + if ( $this->is_markdown( $post->ID ) && ! empty( $posts[ $key ]->post_content_filtered ) ) { + $markdown = $posts[ $key ]->post_content_filtered; + $posts[ $key ]->post_content_filtered = $posts[ $key ]->post_content; + $posts[ $key ]->post_content = $markdown; + } + } + return $posts; + } + + /** + * Singleton silence is golden + */ + private function __construct() {} +} + +add_action( 'init', array( WPCom_Markdown::get_instance(), 'load' ) ); |