From e25e0cc3f1f26ac46dd87638fe7219e9157f09a0 Mon Sep 17 00:00:00 2001
From: sc0Vu <alk03073135@gmail.com>
Date: Mon, 25 Dec 2017 11:19:14 +0800
Subject: [PATCH] jsonMethodToString

---
 src/Utils.php           | 44 +++++++++++++++++++++++++++++++++++++
 test/unit/UtilsTest.php | 48 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)

diff --git a/src/Utils.php b/src/Utils.php
index e6a1d07..1792200 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -12,6 +12,7 @@
 namespace Web3;
 
 use InvalidArgumentException;
+use stdClass;
 use kornrunner\Keccak;
 use phpseclib\Math\BigInteger as BigNumber;
 
@@ -251,4 +252,47 @@ class Utils
 
         return $bn->divide($bnt);
     }
+
+    /**
+     * jsonMethodToString
+     * 
+     * @param stdClass|array $json
+     * @return string
+     */
+    public static function jsonMethodToString($json)
+    {
+        if ($json instanceof stdClass) {
+            // one way to change whole json stdClass to array type
+            // $jsonString = json_encode($json);
+
+            // if (JSON_ERROR_NONE !== json_last_error()) {
+            //     throw new InvalidArgumentException('json_decode error: ' . json_last_error_msg());
+            // }
+            // $json = json_decode($jsonString, true);
+
+            // another way to change json to array type but not whole json stdClass
+            $json = (array) $json;
+            $typeName = [];
+
+            foreach ($json['inputs'] as $param) {
+                if (isset($param->type)) {
+                    $typeName[] = $param->type;
+                }
+            }
+            return $json['name'] . '(' . implode(',', $typeName) . ')';
+        } elseif (!is_array($json)) {
+            throw new InvalidArgumentException('jsonMethodToString json must be array or stdClass.');
+        }
+        if (isset($json['name']) && (bool) strpos('(', $json['name']) === true) {
+            return $json['name'];
+        }
+        $typeName = [];
+
+        foreach ($json['inputs'] as $param) {
+            if (isset($param['type'])) {
+                $typeName[] = $param['type'];
+            }
+        }
+        return $json['name'] . '(' . implode(',', $typeName) . ')';
+    }
 }
\ No newline at end of file
diff --git a/test/unit/UtilsTest.php b/test/unit/UtilsTest.php
index c79307b..366d70d 100644
--- a/test/unit/UtilsTest.php
+++ b/test/unit/UtilsTest.php
@@ -17,6 +17,36 @@ class UtilsTest extends TestCase
      */
     protected $testHex = '68656c6c6f20776f726c64';
 
+    /**
+     * testJsonMethodString
+     * from GameToken approve function
+     * 
+     * @var string
+     */
+    protected $testJsonMethodString = '{
+      "constant": false,
+      "inputs": [
+        {
+          "name": "_spender",
+          "type": "address"
+        },
+        {
+          "name": "_value",
+          "type": "uint256"
+        }
+      ],
+      "name": "approve",
+      "outputs": [
+        {
+          "name": "success",
+          "type": "bool"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }';
+
     /**
      * setUp
      * 
@@ -213,4 +243,22 @@ class UtilsTest extends TestCase
         $this->assertEquals($bnq->toString(), '21');
         $this->assertEquals($bnr->toString(), '16');
     }
+
+    /**
+     * testJsonMethodToString
+     * 
+     * @return void
+     */
+    public function testJsonMethodToString()
+    {
+        $json = json_decode($this->testJsonMethodString);
+        $methodString = Utils::jsonMethodToString($json);
+
+        $this->assertEquals($methodString, 'approve(address,uint256)');
+
+        $json = json_decode($this->testJsonMethodString, true);
+        $methodString = Utils::jsonMethodToString($json);
+
+        $this->assertEquals($methodString, 'approve(address,uint256)');
+    }
 }
\ No newline at end of file