231 lines
5.8 KiB
PHP
231 lines
5.8 KiB
PHP
<?php
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/**
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* Plugin Markdown.
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*
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* Shaare's descriptions are parsed with Markdown.
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*/
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require_once 'Parsedown.php';
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/*
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* If this tag is used on a shaare, the description won't be processed by Parsedown.
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* Using a private tag so it won't appear for visitors.
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*/
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define('NO_MD_TAG', '.nomarkdown');
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/**
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* Parse linklist descriptions.
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*
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* @param array $data linklist data.
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*
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* @return mixed linklist data parsed in markdown (and converted to HTML).
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*/
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function hook_markdown_render_linklist($data)
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{
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foreach ($data['links'] as &$value) {
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if (!empty($value['tags']) && noMarkdownTag($value['tags'])) {
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continue;
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}
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$value['description'] = process_markdown($value['description']);
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}
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return $data;
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}
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/**
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* Parse feed linklist descriptions.
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*
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* @param array $data linklist data.
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*
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* @return mixed linklist data parsed in markdown (and converted to HTML).
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*/
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function hook_markdown_render_feed($data)
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{
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foreach ($data['links'] as &$value) {
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if (!empty($value['tags']) && noMarkdownTag($value['tags'])) {
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continue;
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}
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$value['description'] = process_markdown($value['description']);
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}
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return $data;
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}
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/**
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* Parse daily descriptions.
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*
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* @param array $data daily data.
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*
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* @return mixed daily data parsed in markdown (and converted to HTML).
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*/
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function hook_markdown_render_daily($data)
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{
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// Manipulate columns data
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foreach ($data['cols'] as &$value) {
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foreach ($value as &$value2) {
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if (!empty($value2['tags']) && noMarkdownTag($value2['tags'])) {
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continue;
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}
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$value2['formatedDescription'] = process_markdown($value2['formatedDescription']);
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}
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}
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return $data;
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}
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/**
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* Check if noMarkdown is set in tags.
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*
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* @param string $tags tag list
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*
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* @return bool true if markdown should be disabled on this link.
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*/
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function noMarkdownTag($tags)
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{
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return strpos($tags, NO_MD_TAG) !== false;
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}
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/**
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* When link list is displayed, include markdown CSS.
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*
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* @param array $data includes data.
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*
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* @return mixed - includes data with markdown CSS file added.
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*/
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function hook_markdown_render_includes($data)
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{
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if ($data['_PAGE_'] == Router::$PAGE_LINKLIST
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|| $data['_PAGE_'] == Router::$PAGE_DAILY
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|| $data['_PAGE_'] == Router::$PAGE_EDITLINK
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) {
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$data['css_files'][] = PluginManager::$PLUGINS_PATH . '/markdown/markdown.css';
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}
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return $data;
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}
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/**
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* Hook render_editlink.
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* Adds an help link to markdown syntax.
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*
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* @param array $data data passed to plugin
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*
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* @return array altered $data.
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*/
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function hook_markdown_render_editlink($data)
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{
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// Load help HTML into a string
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$data['edit_link_plugin'][] = file_get_contents(PluginManager::$PLUGINS_PATH .'/markdown/help.html');
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// Add no markdown 'meta-tag' in tag list if it was never used, for autocompletion.
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if (! in_array(NO_MD_TAG, $data['tags'])) {
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$data['tags'][NO_MD_TAG] = 0;
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}
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return $data;
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}
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/**
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* Remove HTML links auto generated by Shaarli core system.
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* Keeps HREF attributes.
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*
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* @param string $description input description text.
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*
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* @return string $description without HTML links.
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*/
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function reverse_text2clickable($description)
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{
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return preg_replace('!<a +href="([^ ]*)">[^ ]+</a>!m', '$1', $description);
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}
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/**
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* Remove <br> tag to let markdown handle it.
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*
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* @param string $description input description text.
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*
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* @return string $description without <br> tags.
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*/
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function reverse_nl2br($description)
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{
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return preg_replace('!<br */?>!im', '', $description);
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}
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/**
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* Remove HTML spaces ' ' auto generated by Shaarli core system.
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*
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* @param string $description input description text.
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*
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* @return string $description without HTML links.
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*/
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function reverse_space2nbsp($description)
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{
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return preg_replace('/(^| ) /m', '$1 ', $description);
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}
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/**
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* Remove dangerous HTML tags (tags, iframe, etc.).
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* Doesn't affect <code> content (already escaped by Parsedown).
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*
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* @param string $description input description text.
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*
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* @return string given string escaped.
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*/
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function sanitize_html($description)
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{
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$escapeTags = array(
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'script',
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'style',
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'link',
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'iframe',
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'frameset',
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'frame',
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);
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foreach ($escapeTags as $tag) {
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$description = preg_replace_callback(
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'#<\s*'. $tag .'[^>]*>(.*</\s*'. $tag .'[^>]*>)?#is',
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function ($match) { return escape($match[0]); },
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$description);
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}
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$description = preg_replace(
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'#(<[^>]+)on[a-z]*="[^"]*"#is',
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'$1',
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$description);
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return $description;
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}
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/**
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* Render shaare contents through Markdown parser.
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* 1. Remove HTML generated by Shaarli core.
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* 2. Reverse the escape function.
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* 3. Generate markdown descriptions.
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* 4. Sanitize sensible HTML tags for security.
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* 5. Wrap description in 'markdown' CSS class.
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*
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* @param string $description input description text.
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*
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* @return string HTML processed $description.
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*/
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function process_markdown($description)
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{
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$parsedown = new Parsedown();
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$processedDescription = $description;
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$processedDescription = reverse_text2clickable($processedDescription);
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$processedDescription = reverse_nl2br($processedDescription);
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$processedDescription = reverse_space2nbsp($processedDescription);
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$processedDescription = unescape($processedDescription);
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$processedDescription = $parsedown
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->setMarkupEscaped(false)
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->setBreaksEnabled(true)
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->text($processedDescription);
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$processedDescription = sanitize_html($processedDescription);
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if(!empty($processedDescription)){
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$processedDescription = '<div class="markdown">'. $processedDescription . '</div>';
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}
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return $processedDescription;
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}
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