feat(paystack): Generate unique secure transaction reference hash

Author: unicodeveloper

composer.json

@@ -13,8 +13,7 @@
    "require": {
     "php": ">=5.5.9",
     "illuminate/support": "5.2.*",
-    "guzzlehttp/guzzle": "~5.0",
-    "ramsey/uuid": "3.1.*"
+    "guzzlehttp/guzzle": "~5.0"
    },
    "require-dev": {
         "phpunit/phpunit" : "4.*",

src/Paystack.php

@@ -3,8 +3,6 @@
 namespace Unicodeveloper\Paystack;
 
 use GuzzleHttp\Client;
-use Ramsey\Uuid\Uuid;
-use Ramsey\Uuid\Exception\UnsatisfiedDependencyException;
 
 class Paystack {
 
@@ -210,30 +208,7 @@ public function getAccessCode()
      */
     public function genTranxRef()
     {
-        try {
-
-                // Generate a version 1 (time-based) UUID object
-                $uuid1 = Uuid::uuid1();
-                echo $uuid1->toString() . "\n"; // i.e. e4eaaaf2-d142-11e1-b3e4-080027620cdd
-
-                // // Generate a version 3 (name-based and hashed with MD5) UUID object
-                // $uuid3 = Uuid::uuid3(Uuid::NAMESPACE_DNS, 'php.net');
-                // echo $uuid3->toString() . "\n"; // i.e. 11a38b9a-b3da-360f-9353-a5a725514269
-
-                // // Generate a version 4 (random) UUID object
-                // $uuid4 = Uuid::uuid4();
-                // echo $uuid4->toString() . "\n"; // i.e. 25769c6c-d34d-4bfe-ba98-e0ee856f3e7a
-
-                // // Generate a version 5 (name-based and hashed with SHA1) UUID object
-                // $uuid5 = Uuid::uuid5(Uuid::NAMESPACE_DNS, 'php.net');
-                // echo $uuid5->toString() . "\n"; // i.e. c4a760a8-dbcf-5254-a0d9-6a4474bd1b62
-
-        } catch (UnsatisfiedDependencyException $e) {
-
-            // Some dependency was not met. Either the method cannot be called on a
-            // 32-bit system, or it can, but it relies on Moontoast\Math to be present.
-            echo 'Caught exception: ' . $e->getMessage() . "\n";
-
-        }
+        return TransRef::getHashedToken();
     }
+
 }

src/TransRef.php

@@ -0,0 +1,78 @@
+<?php
+
+/*
+ * This file is part of the Laravel Paystack package.
+ *
+ * (c) Prosper Otemuyiwa <[email protected]>
+ *
+ * Source http://stackoverflow.com/a/13733588/179104
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Unicodeveloper\Paystack;
+
+class TransRef {
+
+    public static function getPool( $type = 'alnum')
+    {
+        switch ( $type ) {
+            case 'alnum':
+                $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+                break;
+            case 'alpha':
+                $pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+                break;
+            case 'hexdec':
+                $pool = '0123456789abcdef';
+                break;
+            case 'numeric':
+                $pool = '0123456789';
+                break;
+            case 'nozero':
+                $pool = '123456789';
+                break;
+            case 'distinct':
+                $pool = '2345679ACDEFHJKLMNPRSTUVWXYZ';
+                break;
+            default:
+                $pool = (string) $type;
+                break;
+        }
+
+        return $pool;
+    }
+
+
+    public static function secure_crypt($min, $max) {
+        $range = $max - $min;
+
+        if ($range < 0) {
+            return $min; // not so random...
+        }
+
+        $log    = log($range, 2);
+        $bytes  = (int) ($log / 8) + 1; // length in bytes
+        $bits   = (int) $log + 1; // length in bits
+        $filter = (int) (1 << $bits) - 1; // set all lower bits to 1
+        do {
+            $rnd = hexdec( bin2hex( openssl_random_pseudo_bytes( $bytes ) ) );
+            $rnd = $rnd & $filter; // discard irrelevant bits
+        } while ($rnd >= $range);
+
+        return $min + $rnd;
+    }
+
+    public static function getHashedToken($length = 25)
+    {
+        $token = "";
+        $max   = strlen(static::getPool());
+        for ($i = 0; $i < $length; $i++) {
+            $token .= static::getPool()[static::secure_crypt(0, $max)];
+        }
+
+        return $token;
+    }
+
+}