Raphaël G. Git Repositories - packbundle/blob - Util/SluggerUtil.php

   1 <?php declare(strict_types=1);
   2
   3 /*
   4  * This file is part of the Rapsys PackBundle package.
   5  *
   6  * (c) Raphaël Gertz <symfony@rapsys.eu>
   7  *
   8  * For the full copyright and license information, please view the LICENSE
   9  * file that was distributed with this source code.
  10  */
  11
  12 namespace Rapsys\PackBundle\Util;
  13
  14 /**
  15  * Helps manage string conversions
  16  */
  17 class SluggerUtil {
  18         //The secret parameter
  19         private $secret;
  20
  21         //The alpha array
  22         private $alpha;
  23
  24         //The rev array
  25         private $rev;
  26
  27         //The alpha array key number
  28         private $count;
  29
  30         //The offset reduced from secret
  31         private $offset;
  32
  33         /**
  34          * Construct slugger util
  35          *
  36          * @todo Add a command to generate alpha array or generate it on first run with cache storage ?
  37          * @todo Use Cache like in calendar controller through FilesystemAdapter
  38          *
  39          * @param string $secret The secret string
  40          */
  41         public function __construct(string $secret) {
  42                 //Set secret
  43                 $this->secret = $secret;
  44
  45                 /**
  46                  * Pseudo-random alphabet
  47                  * @xxx use array flip and keys to workaround php "smart" that cast range('0', '9') as int instead of string
  48                  * @xxx The key count mismatch, count(alpha)>count(rev), resulted in a data corruption due to duplicate numeric values
  49                  * @todosee required range by json_encode result and short input (0->255 ???)
  50                  */
  51                 $this->alpha = array_keys(array_flip(array_merge(
  52                         range('^', '[', -1),
  53                         range('V', 'Z'),
  54                         range('9', '7', -1),
  55                         range('L', 'O'),
  56                         range('f', 'a', -1),
  57                         range('_', '`'),
  58                         range('3', '0', -1),
  59                         range('E', 'H'),
  60                         range('v', 'r', -1),
  61                         range('+', '/'),
  62                         range('K', 'I', -1),
  63                         range('g', 'j'),
  64                         range('=', ':', -1),
  65                         range('>', '@'),
  66                         range('m', 'k', -1),
  67                         range('4', '6'),
  68                         range('*', '%', -1),
  69                         range('n', 'q'),
  70                         range('U', 'P', -1),
  71                         range(' ', '$'),
  72                         range('D', 'A', -1),
  73                         range('w', 'z'),
  74                         range('~', '!', -1)
  75                 )));
  76
  77                 //Init rev array
  78                 $this->count = count($rev = $this->rev = array_flip($this->alpha));
  79
  80                 //Init split
  81                 $split = str_split($this->secret);
  82
  83                 //Set offset
  84                 $this->offset = array_reduce($split, function ($res, $a) use ($rev) { return $res += $rev[$a]; }, count($split)) % $this->count;
  85         }
  86
  87         /**
  88          * Flatten recursively an array
  89          *
  90          * @param array|string $data The data tree
  91          * @param string|null $current The current prefix
  92          * @param string $sep The key separator
  93          * @param string $prefix The key prefix
  94          * @param string $suffix The key suffix
  95          * @return array The flattened data
  96          */
  97         public function flatten($data, ?string $current = null, string $sep = '.', string $prefix = '', string $suffix = ''): array {
  98                 //Init result
  99                 $ret = [];
 100
 101                 //Look for data array
 102                 if (is_array($data)) {
 103                         //Iteare on each pair
 104                         foreach($data as $k => $v) {
 105                                 //Merge flattened value in return array
 106                                 $ret += $this->flatten($v, empty($current) ? $k : $current.$sep.$k, $sep, $prefix, $suffix);
 107                         }
 108                 //Look flat data
 109                 } else {
 110                         //Store data in flattened key
 111                         $ret[$prefix.$current.$suffix] = $data;
 112                 }
 113
 114                 //Return result
 115                 return $ret;
 116         }
 117
 118         /**
 119          * Crypt and base64uri encode string
 120          *
 121          * @param string $data The data string
 122          * @return string The hashed data
 123          */
 124         public function hash(string $data): string {
 125                 //Return hashed data
 126                 //XXX: we use hash_hmac with md5 hash
 127                 //XXX: crypt was dropped because it provided identical signature for string starting with same pattern
 128                 return str_replace(['+','/'], ['-','_'], base64_encode(hash_hmac('md5', $data, $this->secret, true)));
 129         }
 130
 131         /**
 132          * Serialize then short
 133          *
 134          * @param array $data The data array
 135          * @return string The serialized and shorted data
 136          */
 137         public function serialize(array $data): string {
 138                 //Return shorted serialized data
 139                 //XXX: dropped serialize use to prevent short function from dropping utf-8 characters
 140                 return $this->short(json_encode($data));
 141         }
 142
 143         /**
 144          * Short
 145          *
 146          * @param string $data The data string
 147          * @return string The shorted data
 148          */
 149         public function short(string $data): string {
 150                 //Return string
 151                 $ret = '';
 152
 153                 //With data
 154                 if (!empty($data)) {
 155                         //Iterate on each character
 156                         foreach(str_split($data) as $k => $c) {
 157                                 if (isset($this->rev[$c]) && isset($this->alpha[($this->rev[$c]+$this->offset)%$this->count])) {
 158                                         //XXX: Remap char to an other one
 159                                         $ret .= chr(($this->rev[$c] - $this->offset + $this->count) % $this->count);
 160                                 } else {
 161                                         throw new \RuntimeException(sprintf('Unable to retrieve character: %c', $c));
 162                                 }
 163                         }
 164                 }
 165
 166                 //Send result
 167                 return str_replace(['+','/'], ['-','_'], base64_encode($ret));
 168         }
 169
 170         /**
 171          * Convert string to safe slug
 172          *
 173          * @param string $data The data string
 174          * @return ?string The slugged data
 175          */
 176         function slug(?string $data): ?string {
 177                 //With null
 178                 if ($data === null) {
 179                         //Return null
 180                         return $data;
 181                 }
 182
 183                 //Use Transliterator if available
 184                 if (class_exists('Transliterator')) {
 185                         //Convert from any to latin, then to ascii and lowercase
 186                         $trans = \Transliterator::create('Any-Latin; Latin-ASCII; Lower()');
 187                         //Replace every non alphanumeric character by dash then trim dash
 188                         return trim(preg_replace('/[^a-zA-Z0-9]+/', '-', $trans->transliterate($data)), '-');
 189                 }
 190
 191                 //Convert from utf-8 to ascii, replace quotes with space, remove non alphanumericseparator, replace separator with dash and trim dash
 192                 return trim(preg_replace('/[\/_|+ -]+/', '-', strtolower(preg_replace('/[^a-zA-Z0-9\/_|+ -]/', '', str_replace(['\'', '"'], ' ', iconv('UTF-8', 'ASCII//TRANSLIT', $data))))), '-');
 193         }
 194
 195         /**
 196          * Unshort then unserialize
 197          *
 198          * @param string $data The data string
 199          * @return array The unshorted and unserialized data
 200          */
 201         public function unserialize(string $data): array {
 202                 //Return unshorted unserialized string
 203                 return json_decode($this->unshort($data), true);
 204         }
 205
 206         /**
 207          * Unshort
 208          *
 209          * @param string $data The data string
 210          * @return string The unshorted data
 211          */
 212         public function unshort(string $data): string {
 213                 //Return string
 214                 $ret = '';
 215
 216                 //Iterate on each character
 217                 foreach(str_split(base64_decode(str_replace(['-','_'], ['+','/'], $data))) as $c) {
 218                         //XXX: Reverse map char to an other one
 219                         $ret .= $this->alpha[(ord($c) + $this->offset) % $this->count];
 220                 }
 221
 222                 //Send result
 223                 return $ret;
 224         }
 225 }