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         /**
  69          * Flatten recursively an array
  70          *
  71          * @param array $data The data tree
  72          * @param string|null $current The current prefix
  73          * @param string $sep The key separator
  74          * @param string $prefix The key prefix
  75          * @param string $suffix The key suffix
  76          * @return array The flattened data
  77          */
  78         public function flatten($data, $current = null, $sep = '.', $prefix = '', $suffix = '') {
  79                 //Init result
  80                 $ret = [];
  81
  82                 //Look for data array
  83                 if (is_array($data)) {
  84                         //Iteare on each pair
  85                         foreach($data as $k => $v) {
  86                                 //Merge flattened value in return array
  87                                 $ret += $this->flatten($v, empty($current) ? $k : $current.$sep.$k, $sep, $prefix, $suffix);
  88                         }
  89                 //Look flat data
  90                 } else {
  91                         //Store data in flattened key
  92                         $ret[$prefix.$current.$suffix] = $data;
  93                 }
  94
  95                 //Return result
  96                 return $ret;
  97         }
  98
  99         /**
 100          * Crypt and base64uri encode string
 101          *
 102          * @param string $data The data string
 103          * @return string The hashed data
 104          */
 105         public function hash(string $data): string {
 106                 //Return hashed data
 107                 //XXX: we use hash_hmac with md5 hash
 108                 //XXX: crypt was dropped because it provided identical signature for string starting with same pattern
 109                 return str_replace(['+','/'], ['-','_'], base64_encode(hash_hmac('md5', $data, $this->secret, true)));
 110         }
 111
 112         /**
 113          * Serialize then short
 114          *
 115          * @param array $data The data array
 116          * @return string The serialized and shorted data
 117          */
 118         public function serialize(array $data): string {
 119                 //Return shorted serialized data
 120                 return $this->short(serialize($data));
 121         }
 122
 123         /**
 124          * Short
 125          *
 126          * @param string $data The data string
 127          * @return string The shorted data
 128          */
 129         public function short(string $data): string {
 130                 //Return string
 131                 $ret = '';
 132
 133                 //Iterate on each character
 134                 foreach(str_split($data) as $k => $c) {
 135                         if (isset($this->rev[$c]) && isset($this->alpha[($this->rev[$c]+$this->offset)%$this->count])) {
 136                                 //XXX: Remap char to an other one
 137                                 $ret .= chr(($this->rev[$c] - $this->offset + $this->count) % $this->count);
 138                         }
 139                 }
 140
 141                 //Send result
 142                 return str_replace(['+','/'], ['-','_'], base64_encode($ret));
 143         }
 144
 145         /**
 146          * Convert string to safe slug
 147          *
 148          * @param string $data The data string
 149          * @return string The slugged data
 150          */
 151         function slug(string $data): string {
 152                 //Use Transliterator if available
 153                 if (class_exists('Transliterator')) {
 154                         $trans = \Transliterator::create('Any-Latin; Latin-ASCII; Lower()');
 155                         return preg_replace(['/[^a-zA-Z0-9]+/', '/(^-+|-+$)/'], ['-', ''], $trans->transliterate($data));
 156                 }
 157                 return preg_replace('/[\/_|+ -]+/', '-', strtolower(trim(preg_replace('/[^a-zA-Z0-9\/_|+ -]/', '', str_replace(['\'', '"'], ' ', iconv('UTF-8', 'ASCII//TRANSLIT', $data))), '-')));
 158         }
 159
 160         /**
 161          * Unshort then unserialize
 162          *
 163          * @param string $data The data string
 164          * @return array The unshorted and unserialized data
 165          */
 166         public function unserialize(string $data): array {
 167                 //Return unshorted unserialized string
 168                 return unserialize($this->unshort($data));
 169         }
 170
 171         /**
 172          * Unshort
 173          *
 174          * @param string $data The data string
 175          * @return string The unshorted data
 176          */
 177         public function unshort(string $data): string {
 178                 //Return string
 179                 $ret = '';
 180
 181                 //Iterate on each character
 182                 foreach(str_split(base64_decode(str_replace(['-','_'], ['+','/'], $data))) as $c) {
 183                         //XXX: Reverse map char to an other one
 184                         $ret .= $this->alpha[(ord($c) + $this->offset) % $this->count];
 185                 }
 186
 187                 //Send result
 188                 return $ret;
 189         }
 190 }