Raphaël G. Git Repositories - userbundle/blob - Utils/Slugger.php

   1 <?php
   2
   3 namespace Rapsys\UserBundle\Utils;
   4
   5 use Symfony\Component\DependencyInjection\ContainerInterface;
   6
   7 class Slugger {
   8         //The secret parameter
   9         private $secret;
  10
  11         //The alpha array
  12         private $alpha;
  13
  14         //The rev array
  15         private $rev;
  16
  17         //The alpha array key number
  18         private $count;
  19
  20         //The offset reduced from secret
  21         private $offset;
  22
  23         //Retrieve secret and set offset from reduction
  24         public function __construct(ContainerInterface $container) {
  25                 //Set secret
  26                 $this->secret = $_SERVER['APP_SECRET'] ?? $container->getParameter('kernel.secret');
  27
  28                 //Pseudo-random alphabet
  29                 //XXX: use array flip and keys to workaround php "smart" that cast range('0', '9') as int instead of string
  30                 //XXX: The key count mismatch, count(alpha)>count(rev), resulted in a data corruption due to duplicate numeric values
  31                 //TODO: set this as a parameter generated once in a command ?
  32                 $this->alpha = array_keys(array_flip(array_merge(
  33                         range('^', '[', -1),
  34                         range('V', 'Z'),
  35                         range('9', '7', -1),
  36                         range('L', 'O'),
  37                         range('f', 'a', -1),
  38                         range('_', '`'),
  39                         range('3', '0', -1),
  40                         range('E', 'H'),
  41                         range('v', 'r', -1),
  42                         range('+', '/'),
  43                         range('K', 'I', -1),
  44                         range('g', 'j'),
  45                         range('=', ':', -1),
  46                         range('>', '@'),
  47                         range('m', 'k', -1),
  48                         range('4', '6'),
  49                         range('*', '%', -1),
  50                         range('n', 'q'),
  51                         range('U', 'P', -1),
  52                         range(' ', '$'),
  53                         range('D', 'A', -1),
  54                         range('w', 'z'),
  55                         range('~', '!', -1)
  56                 )));
  57
  58                 //Init rev array
  59                 $this->count = count($rev = $this->rev = array_flip($this->alpha));
  60
  61                 //Init split
  62                 $split = str_split($this->secret);
  63
  64                 //Set offset
  65                 $this->offset = array_reduce($split, function ($res, $a) use ($rev) { return $res += $rev[$a]; }, count($split)) % $this->count;
  66         }
  67
  68         //Short the string
  69         public function short(string $string): string {
  70                 //Return string
  71                 $ret = '';
  72
  73                 //Iterate on each character
  74                 foreach(str_split($string) as $k => $c) {
  75                         if (isset($this->rev[$c]) && isset($this->alpha[($this->rev[$c]+$this->offset)%$this->count])) {
  76                                 //XXX: Remap char to an other one
  77                                 $ret .= chr(($this->rev[$c] - $this->offset + $this->count) % $this->count);
  78                         }
  79                 }
  80
  81                 //Send result
  82                 return str_replace(['+','/'], ['-','_'], base64_encode($ret));
  83         }
  84
  85         //Unshort the string
  86         public function unshort(string $string): string {
  87                 //Return string
  88                 $ret = '';
  89
  90                 //Iterate on each character
  91                 foreach(str_split(base64_decode(str_replace(['-','_'], ['+','/'], $string))) as $c) {
  92                         //XXX: Reverse map char to an other one
  93                         $ret .= $this->alpha[(ord($c) + $this->offset) % $this->count];
  94                 }
  95
  96                 //Send result
  97                 return $ret;
  98         }
  99
 100         //Crypt and base64uri encode string
 101         public function hash(string $string): string {
 102                 return str_replace(['+','/'], ['-','_'], base64_encode(crypt($string, $this->secret)));
 103         }
 104
 105         //Convert string to safe slug
 106         function slug(string $string): string {
 107                 //Use Transliterator if available
 108                 if (class_exists('Transliterator')) {
 109                         $trans = Transliterator::create('Any-Latin; Latin-ASCII; Lower()');
 110                         return preg_replace(['/[^a-zA-Z0-9]+/', '/(^-+|-+$)/'], ['-', ''], $trans->transliterate($string));
 111                 }
 112                 return preg_replace('/[\/_|+ -]+/', '-', strtolower(trim(preg_replace('/[^a-zA-Z0-9\/_|+ -]/', '', str_replace(['\'', '"'], ' ', iconv('UTF-8', 'ASCII//TRANSLIT', $string))), '-')));
 113         }
 114 }