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Consolidated tag sanitization functions

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Added more tag convenience functions
This commit is contained in:
Matthew Barbour 2019-10-10 10:27:46 -05:00 committed by Shish
parent 04b1754893
commit 3a14857b40
1 changed files with 69 additions and 17 deletions
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86
core/imageboard/tag.php
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@ -29,23 +29,7 @@ class Tag
$tags = explode(' ', trim($tags));
/* sanitise by removing invisible / dodgy characters */
$tag_array = [];
foreach ($tags as $tag) {
$tag = preg_replace("/\s/", "", $tag); # whitespace
$tag = preg_replace('/\x20(\x0e|\x0f)/', '', $tag); # unicode RTL
$tag = preg_replace("/\.+/", ".", $tag); # strings of dots?
$tag = preg_replace("/^(\.+[\/\\\\])+/", "", $tag); # trailing slashes?
$tag = trim($tag, ", \t\n\r\0\x0B");
if (mb_strlen($tag, 'UTF-8') > 255) {
flash_message("The tag below is longer than 255 characters, please use a shorter tag.\n$tag\n");
continue;
}
if (!empty($tag)) {
$tag_array[] = $tag;
}
}
$tag_array = self::sanitize_array($tags);
/* if user supplied a blank string, add "tagme" */
if (count($tag_array) === 0 && $tagme) {
@ -101,6 +85,74 @@ class Tag
return $tag_array;
}
public static function sanitize(string $tag): string
{
$tag = preg_replace("/\s/", "", $tag); # whitespace
$tag = preg_replace('/\x20(\x0e|\x0f)/', '', $tag); # unicode RTL
$tag = preg_replace("/\.+/", ".", $tag); # strings of dots?
$tag = preg_replace("/^(\.+[\/\\\\])+/", "", $tag); # trailing slashes?
$tag = trim($tag, ", \t\n\r\0\x0B");
if (mb_strlen($tag, 'UTF-8') > 255) {
throw new Exception("The tag below is longer than 255 characters, please use a shorter tag.\n$tag\n");
}
return $tag;
}
public static function compare(array $tags1, array $tags2): bool
{
if(count($tags1)!==count($tags2)) {
return false;
}
$tags1 = array_map("strtolower",$tags1);
$tags2 = array_map("strtolower",$tags2);
natcasesort($tags1);
natcasesort($tags2);
for($i = 0; $i < count($tags1); $i++) {
if($tags1[$i]!==$tags2[$i]) {
var_dump($tags1);
var_dump($tags2);
return false;
}
}
return true;
}
public static function get_diff_tags(array $source, array $remove): array
{
$before = array_map('strtolower', $source);
$remove = array_map('strtolower', $remove);
$after = [];
foreach ($before as $tag) {
if (!in_array($tag, $remove)) {
$after[] = $tag;
}
}
return $after;
}
public static function sanitize_array(array $tags): array
{
$tag_array = [];
foreach ($tags as $tag) {
try {
$tag = Tag::sanitize($tag);
} catch(Exception $e) {
flash_message($e->getMessage());
continue;
}
if (!empty($tag)) {
$tag_array[] = $tag;
}
}
return $tag_array;
}
public static function sqlify(string $term): string
{
global $database;