/
wp-syntax-download-extension.php
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/
wp-syntax-download-extension.php
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<?php
/*
Plugin Name: WP-Syntax Download Extension
Plugin URI: https://wordpress.org/extend/plugins/wp-syntax-download-extension
Description: Make WP-Syntax highlighted code snippets downloadable.
Version: 1.1.3
Author: Akinori MUSHA
Author URI: https://akinori.org/
License: New BSD Licence
Text Domain: wpsde
Domain Path: languages
*/
/*
* WP-Syntax Download Extension
*
* Copyright (c) 2010-2024 Akinori MUSHA
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
class WP_Syntax_DownloadExtention {
public static function process_download_request($postid, $filename, $download_p) {
// Suppress W3TC comment
add_filter('w3tc_can_print_comment', array(__CLASS__, 'returnFalse'));
if (preg_match("/[\\r\\n]/u", $filename)) {
header('HTTP', true, 400);
header('Content-Type: text/plain; charset=UTF-8');
echo("Bad file name.\n");
exit();
}
$post = &get_post($postid);
if (!$post) {
header('HTTP', true, 404);
header('Content-Type: text/plain; charset=UTF-8');
echo("Post not found.\n");
exit();
}
$content = $post->post_content;
$doc = self::html_documentize($content);
$nodelist = self::xpath($doc, sprintf("//pre[@filename='%s']/text()",
preg_replace("/'/u", "''", $filename)));
if ($nodelist->length == 0) {
header('HTTP', true, 404);
header('Content-Type: text/plain; charset=UTF-8');
echo("Code snippet not found.\n");
exit();
}
$text = $nodelist->item(0)->nodeValue;
$text = preg_replace("/^\\r?\\n/u", "", $text);
if ($download_p) {
header('Content-Type: application/octet-stream');
header(sprintf('Content-Disposition: attachment; filename="%s"',
preg_replace("/\"/u", "\\\"",
preg_replace("/^.*\//u", "", $filename))));
} else {
header('Content-Type: text/plain; charset=UTF-8');
}
echo $text;
exit();
}
public static function html_documentize($html) {
$doc = new DOMDocument();
// loadHTML() defaults the encoding to iso-8859-1!
$doc->loadHTML(<<< HTML
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>$html</body>
</html>
HTML
);
return $doc;
}
public static function xpath($doc, $expr) {
$xpath = new DOMXPath($doc);
return $xpath->query($expr);
}
public static function xpath_at($doc, $expr) {
return self::xpath($doc, $expr)->item(0);
}
public static function html_body($doc) {
return preg_replace(",^.*?<body>(.*)</body>.*$,siu", "$1", $doc->saveHTML(), 1);
}
public static function get_wp_syntax_var($name) {
$class = new ReflectionClass('WP_Syntax');
$array = $class->getDefaultProperties();
return $array[$name];
}
public static function beforeFilter($content) {
if (!is_callable('WP_Syntax', 'substituteToken'))
return $content;
return preg_replace_callback(
"/\s*(<pre(?:\s+(?:[^>]+)|\s*)>)(.*)?(<\/pre>)\s*/siU",
array(__CLASS__, 'substituteToken'),
$content);
}
public static function substituteToken(&$match) {
$pre_open = $match[1];
$code_text = $match[2];
$pre_close = $match[3];
$doc = self::html_documentize("$pre_open$pre_close");
$pre = self::xpath_at($doc, "//body/pre");
$body = $pre->parentNode;
$lang = null;
$line = null;
$highlight = null;
$filename = null;
$escaped = false;
$src = null;
$extra_attributes = array();
foreach ($pre->attributes as $attribute) {
$name = $attribute->name;
$value = $attribute->value;
switch ($name) {
case "lang":
$lang = $value;
continue 2;
case "line":
$line = $value;
continue 2;
case "highlight":
$highlight = $value;
continue 2;
case "src":
$src = $value;
continue 2;
case "escaped":
$escaped = ($value == "true");
continue 2;
case "filename":
$filename = $value;
break;
}
array_push($extra_attributes, $name);
}
if (is_null($filename)) {
return $match[0];
}
foreach ($extra_attributes as $name) {
$pre->removeAttribute($name);
}
$pre->setAttribute("escaped", "true");
if ($escaped) {
$code_text = htmlspecialchars_decode($code_text);
}
$pre->appendChild($doc->createTextNode($code_text));
$html = self::html_body($doc);
$wp_syntax_match = array($html, $lang, $line, "false", $highlight, $src, $code_text, $filename);
return WP_Syntax::substituteToken($wp_syntax_match);
}
public static function afterFilter($content) {
if (!is_callable('WP_Syntax', 'highlight'))
return $content;
/*
* Do stuff instead of WP_Syntax::afterFilter(), which has
* then become void since tags are gone.
*/
return preg_replace_callback(
'/<p>\s*' . self::get_wp_syntax_var('token') . '(\d{3})\s*<\/p>/si',
array(__CLASS__, 'highlight'),
$content);
}
public static function highlight($match) {
$wp_syntax_matches = self::get_wp_syntax_var('matches');
$html = WP_Syntax::highlight($match);
$doc = self::html_documentize($html);
$div = self::xpath_at($doc, "//body/div");
$i = intval($match[1]);
$wp_syntax_match = $wp_syntax_matches[$i];
$filename = $wp_syntax_match[7];
if (is_null($filename)) {
return $html;
}
$this_url = plugins_url(basename(__FILE__), __FILE__);
$postid = get_the_ID();
$raw_url = sprintf("%s/%s/%s", $this_url, $postid, $filename);
$download_url = sprintf("%s/%s/download/%s", $this_url, $postid, $filename);
$div_caption = $doc->createElement("div");
$div_caption->setAttribute("class", "wp_syntax_download");
$div_filename = $doc->createElement("div");
$div_filename->setAttribute("class", "wp_syntax_download_filename");
$anchor = $doc->createElement("a");
$anchor_name = "file-$filename";
$anchor->setAttribute("name", $anchor_name);
$anchor->setAttribute("href", "#" . urlencode($anchor_name));
$anchor->setAttribute("title", $filename);
$anchor->appendChild($doc->createTextNode($filename));
$div_filename->appendChild($anchor);
$div_actions = $doc->createElement("div");
$div_actions->setAttribute("class", "wp_syntax_download_actions");
$raw = $doc->createElement("a");
$raw->setAttribute("href", $raw_url);
$raw->appendChild($doc->createTextNode("raw"));
$download = $doc->createElement("a");
$download->setAttribute("href", $download_url);
$download->appendChild($doc->createTextNode("download"));
$div_actions->appendChild($raw);
$div_actions->appendChild($doc->createTextNode(" "));
$div_actions->appendChild($download);
$div_caption->appendChild($div_filename);
$div_caption->appendChild($div_actions);
$div->insertBefore($div_caption, $div->firstChild);
return self::html_body($doc);
}
public static function tinyMCEConfig($init) {
$init["extended_valid_elements"] = preg_replace('/((?:^|,)pre\[.*?)\]/', '$1|dir|title|wrap|filename]', $init['extended_valid_elements']);
return $init;
}
public static function default_css_url () {
return plugins_url(basename(__FILE__, '.php') . ".css", __FILE__);
}
public static function head() {
if (get_option('wpsde_disable_default_css') != 't') {
printf(<<< HEAD
<link type="text/css" rel="stylesheet" href="%s" />
HEAD
, htmlspecialchars(self::default_css_url()));
}
$user_css = trim(get_option('wpsde_user_css'));
if (!empty($user_css)) {
printf(<<< STYLE
<style type="text/css">
<!--
%s
//-->
</style>
STYLE
, esc_html($user_css));
}
}
public static function menu() {
add_options_page('WP-Syntax Download Extension',
'WP-Syntax Download Extension',
8,
__FILE__,
array(__CLASS__, 'options'));
}
public static function options() {
$option_names = array('wpsde_disable_default_css', 'wpsde_user_css');
$options = array();
foreach ($option_names as $name) {
$value = get_option($name);
$options[$name] = $value;
}
printf(<<< HEADER
<div class="wrap">
<h2>WP-Syntax Download Extension</h2>
HEADER
);
if (!is_callable('WP_Syntax', 'highlight')) {
printf(<<< MESSAGE
<div class="updated">
<p><em style="color: red">%s</em></p>
</div>
MESSAGE
,
htmlspecialchars(__('This plug-in does not work without WP-Syntax activated.', 'wpsde')));
}
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$wpsde_key = $_SESSION['wpsde_key'];
unset($_SESSION['wpsde_key']);
$wpsde_key_received = $_POST['wpsde_key'];
foreach ($option_names as $name) {
$options[$name] = $_POST[$name];
}
if (isset($wpsde_key) && $wpsde_key == $wpsde_key_received) {
foreach ($options as $name => $value) {
update_option($name, $value);
}
printf(<<< MESSAGE
<div class="updated">
<p><strong>%s</strong></p>
</div>
MESSAGE
,
htmlspecialchars(__('Options saved.', 'wpsde')));
} else {
printf(<<< MESSAGE
<div class="updated">
<p><em style="color: red">%s</em></p>
</div>
MESSAGE
,
htmlspecialchars(__('Invalid form submission. (Reload or CSRF detected)', 'wpsde')));
}
}
$wpsde_key = md5(SECURE_AUTH_KEY . time());
$_SESSION['wpsde_key'] = $wpsde_key;
printf(<<< FORM
<form method="POST">
<input type="hidden" name="wpsde_key" value="%s" />
<p>
<input type="checkbox" name="wpsde_disable_default_css" value="t" id="id_wpsde_disable_default_css"%s />
<label for="id_wpsde_disable_default_css">%s</label>
(<a href="%s" target="_blank">%s</a>)
<br />
</p>
<p>
<label for="id_wpsde_user_css">%s:</label><br />
<textarea name="wpsde_user_css" id="id_wpsde_user_css" cols="50" rows="10">%s</textarea>
</p>
<p class="submit">
<input type="submit" value="%s" class="button-primary" />
</p>
</form>
FORM
,
htmlspecialchars($wpsde_key),
($options['wpsde_disable_default_css'] == 't' ? ' checked="checked"' : ''),
htmlspecialchars(__('Disable default CSS', 'wpsde')),
htmlspecialchars(self::default_css_url()),
htmlspecialchars(__('view', 'wpsde')),
htmlspecialchars(__('User CSS', 'wpsde')),
esc_html($options['wpsde_user_css']),
htmlspecialchars(__('Save Changes', 'wpsde')));
printf(<<< FOOTER
</div>
FOOTER
);
}
public static function returnFalse($value) {
return false;
}
public static function setup() {
add_action('wp_head', array(__CLASS__, 'head'), 99, 0);
// If WP-Syntax is loaded earlier, rehook its filters so ours come first.
$filters = array('the_content', 'the_excerpt', 'comment_text');
foreach ($filters as $filter) {
self::force_add_filter($filter, array(__CLASS__, 'beforeFilter'), 0);
self::force_add_filter($filter, array(__CLASS__, 'afterFilter'), 99);
}
self::force_add_filter('tiny_mce_before_init', array(__CLASS__, 'tinyMCEConfig'), 99);
add_action('admin_menu', array(__CLASS__, 'menu'));
}
public static function force_add_filter($filter, $method, $priority) {
$super = array('WP_Syntax', $method[1]);
$current_priority = has_filter($filter, $super);
if ($current_priority === false) {
add_filter($filter, $method, $priority);
} else {
remove_filter($filter, $super, $current_priority);
add_filter($filter, $method, $current_priority);
add_filter($filter, $super, $current_priority);
}
}
}
if (array_key_exists('PATH_INFO', $_SERVER) && preg_match(",^/([0-9]+)/(download/)?(.+)$,u", $_SERVER['PATH_INFO'], $matches)) {
// This require() cannot be put in a function because of variable scopes.
require(dirname(__FILE__) . '/../../../wp-load.php');
WP_Syntax_DownloadExtention::process_download_request($matches[1], urldecode($matches[3]), !empty($matches[2]));
} else {
load_plugin_textdomain('wpsde', false, dirname(plugin_basename(__FILE__)) . '/languages');
if (!session_id())
session_start();
WP_Syntax_DownloadExtention::setup();
}
// Local Variables:
// mode: php
// c-basic-offset: 4
// indent-tabs-mode: nil
// End: