mirror of https://github.com/pixelfed/pixelfed.git
51 lines
994 B
PHP
51 lines
994 B
PHP
<?php
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namespace App\Services;
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use Cache;
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class HashidService {
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public const MIN_LIMIT = 15;
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public const CMAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
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public static function encode($id)
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{
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if(!is_numeric($id) || $id > PHP_INT_MAX || strlen($id) < self::MIN_LIMIT) {
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return null;
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}
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$key = "hashids:{$id}";
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return Cache::remember($key, now()->hours(48), function() use($id) {
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$cmap = self::CMAP;
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$base = strlen($cmap);
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$shortcode = '';
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while($id) {
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$id = ($id - ($r = $id % $base)) / $base;
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$shortcode = $cmap[$r] . $shortcode;
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}
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return $shortcode;
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});
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}
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public static function decode($short)
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{
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$len = strlen($short);
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if($len < 3 || $len > 11) {
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return null;
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}
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$id = 0;
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foreach(str_split($short) as $needle) {
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$pos = strpos(self::CMAP, $needle);
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// if(!$pos) {
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// return null;
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// }
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$id = ($id*64) + $pos;
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}
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if(strlen($id) < self::MIN_LIMIT) {
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return null;
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}
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return $id;
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}
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}
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