Replaced bearer token by headers property at RPC client

Signed-off-by: Roman Bylbas <romka.bulbas@gmail.com>

Author: Roman Bylbas

README.md

@@ -31,12 +31,12 @@ extension=secp256k1.so
 
 ## Usage
 ### Creating RpcClient
-Create `RpcClient` by passing node url and authorization token (optional) to constructor
+Create `RpcClient` by passing node url and headers (optional) to constructor
 ```php
 $nodeUrl = 'http://127.0.0.1:7777';
-$bearerToken = '6ae6c8b31f09df244019ffef60c274e4'; // Optional
+$headers = array('Authorization' => 'Bearer 6ae6c8b31f09df244019ffef60c274e4'); // Optional
 
-$client = new Casper\Rpc\RpcClient($nodeUrl, $bearerToken);
+$client = new Casper\Rpc\RpcClient($nodeUrl, $headers);
 ```
 
 ### RPC call examples

docs/API/RpcClientAPI.md

@@ -4,13 +4,13 @@ Class for interacting with the network via RPC
 ---
 ## Constructor
 ```php
-__constructor(string $nodeUrl, string $bearerToken = null)
+__constructor(string $nodeUrl, string $headers = null)
 ```
 ### Parameters
-| Name           | Type | Description                | Required |
-|----------------|---|----------------------------|----------|
-| `$nodeUrl`     | `string` | Full node url string       | Yes      |
-| `$bearerToken` | `string` | Authorization bearer token | No       |
+| Name       | Type     | Description          | Required |
+|------------|----------|----------------------|----------|
+| `$nodeUrl` | `string` | Full node url string | Yes      |
+| `$headers` | `array`  | Additional headers   | No       |
 
 ---
 ## Put deploy

src/Rpc/RpcClient.php

@@ -67,14 +67,14 @@ class RpcClient
 
     private string $nodeUrl;
 
-    private ?string $bearerToken = null;
+    private array $headers;
 
     private ?string $lastApiVersion = null;
 
-    public function __construct(string $nodeUrl, string $bearerToken = null)
+    public function __construct(string $nodeUrl, array $headers = array())
     {
         $this->nodeUrl = $nodeUrl;
-        $this->bearerToken = $bearerToken;
+        $this->headers = $headers;
     }
 
     public function getLastApiVersion(): ?string
@@ -466,8 +466,8 @@ private function rpcCallMethod(string $method, array $params = array()): array
         $curl = curl_init($url);
 
         $headers = ['Accept: application/json', 'Content-type: application/json'];
-        if ($this->bearerToken !== null) {
-            $headers[] = 'Authorization: Bearer ' . $this->bearerToken;
+        foreach ($this->headers as $name => $value) {
+            $headers[] = "$name: $value";
         }
 
         curl_setopt($curl, CURLOPT_URL, $url);