From 45f549482a0158008534f0862287962b51fd4cab Mon Sep 17 00:00:00 2001
From: Trevor Slocum <trevor@rocketnine.space>
Date: Fri, 30 Apr 2021 23:12:19 -0700
Subject: [PATCH] Support regular expression keywords

---
 imgboard.php      | 17 ++++++++++++++---
 inc/functions.php |  8 ++++++++
 inc/html.php      |  8 +++++++-
 3 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/imgboard.php b/imgboard.php
index 409318f..7875889 100644
--- a/imgboard.php
+++ b/imgboard.php
@@ -860,13 +860,19 @@ EOF;
 					$keyword['text'] = $_POST['text'];
 					$keyword['action'] = $_POST['action'];
 
+					$kw = $keyword['text'];
+
+					if (isset($_POST['regexp']) && $_POST['regexp'] == '1') {
+						$keyword['text'] = 'regexp:' . $keyword['text'];
+					}
+
 					insertKeyword($keyword);
 					if ($_GET['keywords'] > 0) {
-						manageLogAction(sprintf(__('Updated keyword %s'), htmlentities($keyword['text'])));
+						manageLogAction(sprintf(__('Updated keyword %s'), htmlentities($kw)));
 						$text .= manageInfo(__('Keyword updated.'));
 						$_GET['keywords'] = 0;
 					} else {
-						manageLogAction(sprintf(__('Updated keyword %s'), htmlentities($keyword['text'])));
+						manageLogAction(sprintf(__('Updated keyword %s'), htmlentities($kw)));
 						$text .= manageInfo(__('Keyword added.'));
 					}
 				} elseif (isset($_GET['deletekeyword'])) {
@@ -875,8 +881,13 @@ EOF;
 						fancyDie(__('That keyword does not exist.'));
 					}
 
+					$kw = $keyword['text'];
+					if (substr($keyword['text'], 0, 7) == 'regexp:') {
+						$kw = substr($keyword['text'], 7);
+					}
+
 					deleteKeyword($_GET['deletekeyword']);
-					manageLogAction(sprintf(__('Deleted keyword %s'), htmlentities($keyword['text'])));
+					manageLogAction(sprintf(__('Deleted keyword %s'), htmlentities($kw)));
 					$text .= manageInfo(__('Keyword deleted.'));
 				}
 
diff --git a/inc/functions.php b/inc/functions.php
index cd6c7a2..f97de87 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -311,6 +311,14 @@ function checkBanned() {
 function checkKeywords($text) {
 	$keywords = allKeywords();
 	foreach ($keywords as $keyword) {
+		if (substr($keyword['text'], 0, 7) == 'regexp:') {
+			if (preg_match(substr($keyword['text'],7), $text)) {
+				$keyword['text'] = substr($keyword['text'],7);
+				return $keyword;
+			}
+			continue;
+		}
+
 		if (stripos($text, $keyword['text']) !== false) {
 			return $keyword;
 		}
diff --git a/inc/html.php b/inc/html.php
index 841cfb4..01dafe3 100644
--- a/inc/html.php
+++ b/inc/html.php
@@ -1374,6 +1374,7 @@ function manageEditKeyword($id) {
 
 	$v_text = '';
 	$v_action = '';
+	$v_regexp_checked = '';
 	if ($id > 0) {
 		$keyword = keywordByID($id);
 		if (empty($keyword)) {
@@ -1381,6 +1382,11 @@ function manageEditKeyword($id) {
 		}
 		$v_text = htmlentities($keyword['text'], ENT_QUOTES);
 		$v_action = $keyword['action'];
+
+		if (substr($v_text, 0, 7) == 'REGEXP:') {
+			$v_regexp_checked = 'selected';
+			$v_text = substr($v_text, 7);
+		}
 	}
 
 	$txt_keyword = __('Keyword');
@@ -1392,7 +1398,7 @@ function manageEditKeyword($id) {
 	<form id="tinyib" name="tinyib" method="post" action="?manage&keywords=$id">
 	<fieldset>
 	<legend>$txt_keywords</legend>
-	<div valign="top"><label for="keyword">$txt_keyword</label> <input type="text" name="text" id="text" value="$v_text"><br>
+	<div valign="top"><label for="keyword">$txt_keyword</label> <input type="text" name="text" id="text" value="$v_text"> <label for="regexp">&nbsp; <input type="checkbox" name="regexp" value="1" $v_regexp_checked> Regular expression</label><br>
 	<label for="action">$txt_action</label>
 	<select name="action">
 EOF;