eth_getStorageAt

* eth_getStorageAt
* QuantityValidator

src/Eth.php

@@ -8,6 +8,7 @@ use Web3\RequestManagers\RequestManager;
 use Web3\RequestManagers\HttpRequestManager;
 use Web3\Validators\AddressValidator;
 use Web3\Validators\TagValidator;
+use Web3\Validators\QuantityValidator;
 
 class Eth
 {
@@ -38,6 +39,13 @@ class Eth
                 TagValidator::class
             ]
         ],
+        'eth_getStorageAt' => [
+            'params'=> [
+                AddressValidator::class,
+                QuantityValidator::class,
+                TagValidator::class
+            ]
+        ],
     ];
 
     /**

src/Validators/QuantityValidator.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Web3\Validators;
+
+use Web3\Validators\IValidator;
+
+class QuantityValidator
+{
+    /**
+     * validate
+     *
+     * @param string $value
+     * @return bool
+     */
+    public static function validate($value)
+    {
+        // maybe change in_int and preg_match future
+        return (is_int($value) || preg_match('/^0x[a-fA-f0-9]+/', $value) >= 1);
+    }
+}

src/Validators/TagValidator.php

@@ -18,7 +18,7 @@ class TagValidator
             'latest', 'earliest', 'pending'
         ];
 
-        // maybe change in_int future
-        return (is_int($value) || in_array($value, $tags));
+        // maybe change in_int and preg_match future
+        return (is_int($value) || preg_match('/^0x[a-fA-f0-9]+/', $value) >= 1 || in_array($value, $tags));
     }
 }

test/unit/EthTest.php

@@ -220,6 +220,27 @@ class EthTest extends TestCase
         });
     }
 
+    /**
+     * testGetStorageAt
+     * 
+     * @return void
+     */    
+    public function testGetStorageAt()
+    {
+        $eth = $this->web3->eth;
+
+        $eth->getStorageAt('0x407d73d8a49eeb85d32cf465507dd71d507100c1', '0x0', 'latest', function ($err, $storage) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            if (isset($storage->result)) {
+                $this->assertTrue(is_string($storage->result));
+            } else {
+                $this->fail($storage->error->message);
+            }
+        });
+    }
+
     /**
      * testUnallowedMethod
      *