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| -rw-r--r-- | vendor/ezyang/htmlpurifier/plugins/phorum/htmlpurifier.php | 316 |
diff --git a/vendor/ezyang/htmlpurifier/plugins/phorum/htmlpurifier.php b/vendor/ezyang/htmlpurifier/plugins/phorum/htmlpurifier.php new file mode 100644 index 0000000..f66d8c3 --- /dev/null +++ b/vendor/ezyang/htmlpurifier/plugins/phorum/htmlpurifier.php @@ -0,0 +1,316 @@ +<?php + +/** + * HTML Purifier Phorum Mod. Filter your HTML the Standards-Compliant Way! + * + * This Phorum mod enables users to post raw HTML into Phorum. But never + * fear: with the help of HTML Purifier, this HTML will be beat into + * de-XSSed and standards-compliant form, safe for general consumption. + * It is not recommended, but possible to run this mod in parallel + * with other formatters (in short, please DISABLE the BBcode mod). + * + * For help migrating from your previous markup language to pure HTML + * please check the migrate.bbcode.php file. + * + * If you'd like to use this with a WYSIWYG editor, make sure that + * editor sets $PHORUM['mod_htmlpurifier']['wysiwyg'] to true. Otherwise, + * administrators who need to edit other people's comments may be at + * risk for some nasty attacks. + * + * Tested with Phorum 5.2.11. + */ + +// Note: Cache data is base64 encoded because Phorum insists on flinging +// to the user and expecting it to come back unharmed, newlines and +// all, which ain't happening. It's slower, it takes up more space, but +// at least it won't get mutilated + +/** + * Purifies a data array + */ +function phorum_htmlpurifier_format($data) +{ + $PHORUM = $GLOBALS["PHORUM"]; + + $purifier =& HTMLPurifier::getInstance(); + $cache_serial = $PHORUM['mod_htmlpurifier']['body_cache_serial']; + + foreach($data as $message_id => $message){ + if(isset($message['body'])) { + + if ($message_id) { + // we're dealing with a real message, not a fake, so + // there a number of shortcuts that can be taken + + if (isset($message['meta']['htmlpurifier_light'])) { + // format hook was called outside of Phorum's normal + // functions, do the abridged purification + $data[$message_id]['body'] = $purifier->purify($message['body']); + continue; + } + + if (!empty($PHORUM['args']['purge'])) { + // purge the cache, must be below the following if + unset($message['meta']['body_cache']); + } + + if ( + isset($message['meta']['body_cache']) && + isset($message['meta']['body_cache_serial']) && + $message['meta']['body_cache_serial'] == $cache_serial + ) { + // cached version is present, bail out early + $data[$message_id]['body'] = base64_decode($message['meta']['body_cache']); + continue; + } + } + + // migration might edit this array, that's why it's defined + // so early + $updated_message = array(); + + // create the $body variable + if ( + $message_id && // message must be real to migrate + !isset($message['meta']['body_cache_serial']) + ) { + // perform migration + $fake_data = array(); + list($signature, $edit_message) = phorum_htmlpurifier_remove_sig_and_editmessage($message); + $fake_data[$message_id] = $message; + $fake_data = phorum_htmlpurifier_migrate($fake_data); + $body = $fake_data[$message_id]['body']; + $body = str_replace("<phorum break>\n", "\n", $body); + $updated_message['body'] = $body; // save it in + $body .= $signature . $edit_message; // add it back in + } else { + // reverse Phorum's pre-processing + $body = $message['body']; + // order is important + $body = str_replace("<phorum break>\n", "\n", $body); + $body = str_replace(array('<','>','&', '"'), array('<','>','&','"'), $body); + if (!$message_id && defined('PHORUM_CONTROL_CENTER')) { + // we're in control.php, so it was double-escaped + $body = str_replace(array('<','>','&', '"'), array('<','>','&','"'), $body); + } + } + + $body = $purifier->purify($body); + + // dynamically update the cache (MUST BE DONE HERE!) + // this is inefficient because it's one db call per + // cache miss, but once the cache is in place things are + // a lot zippier. + + if ($message_id) { // make sure it's not a fake id + $updated_message['meta'] = $message['meta']; + $updated_message['meta']['body_cache'] = base64_encode($body); + $updated_message['meta']['body_cache_serial'] = $cache_serial; + phorum_db_update_message($message_id, $updated_message); + } + + // must not get overloaded until after we cache it, otherwise + // we'll inadvertently change the original text + $data[$message_id]['body'] = $body; + + } + } + + return $data; +} + +// ----------------------------------------------------------------------- +// This is fragile code, copied from read.php:596 (Phorum 5.2.6). Please +// keep this code in-sync with Phorum + +/** + * Generates a signature based on a message array + */ +function phorum_htmlpurifier_generate_sig($row) +{ + $phorum_sig = ''; + if(isset($row["user"]["signature"]) + && isset($row['meta']['show_signature']) && $row['meta']['show_signature']==1){ + $phorum_sig=trim($row["user"]["signature"]); + if(!empty($phorum_sig)){ + $phorum_sig="\n\n$phorum_sig"; + } + } + return $phorum_sig; +} + +/** + * Generates an edit message based on a message array + */ +function phorum_htmlpurifier_generate_editmessage($row) +{ + $PHORUM = $GLOBALS['PHORUM']; + $editmessage = ''; + if(isset($row['meta']['edit_count']) && $row['meta']['edit_count'] > 0) { + $editmessage = str_replace ("%count%", $row['meta']['edit_count'], $PHORUM["DATA"]["LANG"]["EditedMessage"]); + $editmessage = str_replace ("%lastedit%", phorum_date($PHORUM["short_date_time"],$row['meta']['edit_date']), $editmessage); + $editmessage = str_replace ("%lastuser%", $row['meta']['edit_username'], $editmessage); + $editmessage = "\n\n\n\n$editmessage"; + } + return $editmessage; +} + +// End fragile code +// ----------------------------------------------------------------------- + +/** + * Removes the signature and edit message from a message + * @param $row Message passed by reference + */ +function phorum_htmlpurifier_remove_sig_and_editmessage(&$row) +{ + $signature = phorum_htmlpurifier_generate_sig($row); + $editmessage = phorum_htmlpurifier_generate_editmessage($row); + $replacements = array(); + // we need to remove add <phorum break> as that is the form these + // extra bits are in. + if ($signature) $replacements[str_replace("\n", "<phorum break>\n", $signature)] = ''; + if ($editmessage) $replacements[str_replace("\n", "<phorum break>\n", $editmessage)] = ''; + $row['body'] = strtr($row['body'], $replacements); + return array($signature, $editmessage); +} + +/** + * Indicate that data is fully HTML and not from migration, invalidate + * previous caches + * @note This function could generate the actual cache entries, but + * since there's data missing that must be deferred to the first read + */ +function phorum_htmlpurifier_posting($message) +{ + $PHORUM = $GLOBALS["PHORUM"]; + unset($message['meta']['body_cache']); // invalidate the cache + $message['meta']['body_cache_serial'] = $PHORUM['mod_htmlpurifier']['body_cache_serial']; + return $message; +} + +/** + * Overload quoting mechanism to prevent default, mail-style quote from happening + */ +function phorum_htmlpurifier_quote($array) +{ + $PHORUM = $GLOBALS["PHORUM"]; + $purifier =& HTMLPurifier::getInstance(); + $text = $purifier->purify($array[1]); + $source = htmlspecialchars($array[0]); + return "<blockquote cite=\"$source\">\n$text\n</blockquote>"; +} + +/** + * Ensure that our format hook is processed last. Also, loads the library. + * @credits <http://secretsauce.phorum.org/snippets/make_bbcode_last_formatter.php.txt> + */ +function phorum_htmlpurifier_common() +{ + require_once(dirname(__FILE__).'/htmlpurifier/HTMLPurifier.auto.php'); + require(dirname(__FILE__).'/init-config.php'); + + $config = phorum_htmlpurifier_get_config(); + HTMLPurifier::getInstance($config); + + // increment revision.txt if you want to invalidate the cache + $GLOBALS['PHORUM']['mod_htmlpurifier']['body_cache_serial'] = $config->getSerial(); + + // load migration + if (file_exists(dirname(__FILE__) . '/migrate.php')) { + include(dirname(__FILE__) . '/migrate.php'); + } else { + echo '<strong>Error:</strong> No migration path specified for HTML Purifier, please check + <tt>modes/htmlpurifier/migrate.bbcode.php</tt> for instructions on + how to migrate from your previous markup language.'; + exit; + } + + if (!function_exists('phorum_htmlpurifier_migrate')) { + // Dummy function + function phorum_htmlpurifier_migrate($data) {return $data;} + } + +} + +/** + * Pre-emptively performs purification if it looks like a WYSIWYG editor + * is being used + */ +function phorum_htmlpurifier_before_editor($message) +{ + if (!empty($GLOBALS['PHORUM']['mod_htmlpurifier']['wysiwyg'])) { + if (!empty($message['body'])) { + $body = $message['body']; + // de-entity-ize contents + $body = str_replace(array('<','>','&'), array('<','>','&'), $body); + $purifier =& HTMLPurifier::getInstance(); + $body = $purifier->purify($body); + // re-entity-ize contents + $body = htmlspecialchars($body, ENT_QUOTES, $GLOBALS['PHORUM']['DATA']['CHARSET']); + $message['body'] = $body; + } + } + return $message; +} + +function phorum_htmlpurifier_editor_after_subject() +{ + // don't show this message if it's a WYSIWYG editor, since it will + // then be handled automatically + if (!empty($GLOBALS['PHORUM']['mod_htmlpurifier']['wysiwyg'])) { + $i = $GLOBALS['PHORUM']['DATA']['MODE']; + if ($i == 'quote' || $i == 'edit' || $i == 'moderation') { + ?> + <div> + <p> + <strong>Notice:</strong> HTML has been scrubbed for your safety. + If you would like to see the original, turn off WYSIWYG mode + (consult your administrator for details.) + </p> + </div> + <?php + } + return; + } + if (!empty($GLOBALS['PHORUM']['mod_htmlpurifier']['suppress_message'])) return; + ?><div class="htmlpurifier-help"> + <p> + <strong>HTML input</strong> is enabled. Make sure you escape all HTML and + angled brackets with <code>&lt;</code> and <code>&gt;</code>. + </p><?php + $purifier =& HTMLPurifier::getInstance(); + $config = $purifier->config; + if ($config->get('AutoFormat.AutoParagraph')) { + ?><p> + <strong>Auto-paragraphing</strong> is enabled. Double + newlines will be converted to paragraphs; for single + newlines, use the <code>pre</code> tag. + </p><?php + } + $html_definition = $config->getDefinition('HTML'); + $allowed = array(); + foreach ($html_definition->info as $name => $x) $allowed[] = "<code>$name</code>"; + sort($allowed); + $allowed_text = implode(', ', $allowed); + ?><p><strong>Allowed tags:</strong> <?php + echo $allowed_text; + ?>.</p><?php + ?> + </p> + <p> + For inputting literal code such as HTML and PHP for display, use + CDATA tags to auto-escape your angled brackets, and <code>pre</code> + to preserve newlines: + </p> + <pre><pre><![CDATA[ +<em>Place code here</em> +]]></pre></pre> + <p> + Power users, you can hide this notice with: + <pre>.htmlpurifier-help {display:none;}</pre> + </p> + </div><?php +} + +// vim: et sw=4 sts=4 |