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