GraphQL Feature added

Author: tareqtms

README.md

@@ -234,6 +234,32 @@ $shopify->Blog($blogID)->Article($articleID)->put($updateArtilceInfo);
 $blogArticle = $shopify->Blog($blogID)->Article($articleID)->delete();
 ```
 
+### GraphQL <sup>*v1.1-beta*</sup>
+The GraphQL Admin API is a GraphQL-based alternative to the REST-based Admin API, and makes the functionality of the Shopify admin available at a single GraphQL endpoint. The full set of supported types can be found in the [GraphQL Admin API reference](https://help.shopify.com/en/api/graphql-admin-api/reference).
+You can simply call the GraphQL resource and make a post request with a GraphQL string:
+
+> The GraphQL Admin API requires an access token for making authenticated requests. So it won't work with `ApiKey` and `Password` which is allowed for REST API resources.
+
+```php
+$graphQL = <<<Query
+query {
+  shop {
+    name
+    primaryDomain {
+      url
+      host
+    }
+  }
+}
+Query;
+
+$data = $shopify->GraphQL->post($graphQL);
+```
+
+##### GraphQL Builder
+This SDK only accepts a GraphQL string as input. You can build your GraphQL from [Shopify GraphQL Builder](https://help.shopify.com/en/api/graphql-admin-api/graphiql-builder)
+
+
 ### Resource Mapping
 Some resources are available directly, some resources are only available through parent resources and a few resources can be accessed both ways. It is recommended that you see the details in the related Shopify API Reference page about each resource. Each resource name here is linked to related Shopify API Reference page.
 > Use the resources only by listed resource map. Trying to get a resource directly which is only available through parent resource may end up with errors.
@@ -304,6 +330,7 @@ Some resources are available directly, some resources are only available through
 - Theme -> [Asset](https://help.shopify.com/api/reference/asset/)
 - [User](https://help.shopify.com/api/reference/user) _(read only, Shopify Plus Only)_
 - [Webhook](https://help.shopify.com/api/reference/webhook)
+- [GraphQL](https://help.shopify.com/en/api/graphql-admin-api/reference)
 
 ### Custom Actions
 There are several action methods which can be called without calling the `get()`, `post()`, `put()`, `delete()` methods directly, but eventually results in a custom call to one of those methods.

lib/GraphQL.php

@@ -0,0 +1,70 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Tareq
+ * Date: 5/27/2019
+ * Time: 12:36 PM
+ *
+ * @see https://help.shopify.com/en/api/graphql-admin-api GraphQL Admin API
+ */
+
+namespace PHPShopify;
+
+
+use PHPShopify\Exception\SdkException;
+
+class GraphQL extends ShopifyResource
+{
+
+    /**
+     * @inheritdoc
+     */
+    protected function getResourcePath()
+    {
+        return 'graphql';
+    }
+
+    /**
+     * Call POST method for any GraphQL request
+     *
+     * @param string $graphQL A valid GraphQL String. @see https://help.shopify.com/en/api/graphql-admin-api/graphiql-builder GraphiQL builder - you can build your graphql string from here.
+     * @param string $url
+     * @param bool $wrapData
+     *
+     * @uses HttpRequestGraphQL::post() to send the HTTP request
+     *
+     * @return array
+     */
+    public function post($graphQL, $url = null, $wrapData = false)
+    {
+        if (!$url) $url = $this->generateUrl();
+
+        $response = HttpRequestGraphQL::post($url, $graphQL, $this->httpHeaders);
+
+        return $this->processResponse($response);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function get($urlParams = array(), $url = null, $dataKey = null)
+    {
+        throw new SdkException("Only POST method is allowed for GraphQL!");
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function put($dataArray, $url = null, $wrapData = true)
+    {
+        throw new SdkException("Only POST method is allowed for GraphQL!");
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function delete($urlParams = array(), $url = null)
+    {
+        throw new SdkException("Only POST method is allowed for GraphQL!");
+    }
+}

lib/HttpRequestGraphQL.php

@@ -0,0 +1,68 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Tareq
+ * Date: 5/30/2019
+ * Time: 3:25 PM
+ */
+
+namespace PHPShopify;
+
+
+use PHPShopify\Exception\SdkException;
+
+class HttpRequestGraphQL extends HttpRequestJson
+{
+    /**
+     * Prepared GraphQL string to be posted with request
+     *
+     * @var string
+     */
+    private static $postDataGraphQL;
+
+    /**
+     * Prepare the data and request headers before making the call
+     *
+     * @param mixed $data
+     * @param array $httpHeaders
+     *
+     * @return void
+     *
+     * @throws SdkException if $data is not a string
+     */
+    protected static function prepareRequest($httpHeaders = array(), $data = array())
+    {
+
+        if (is_string($data)) {
+            self::$postDataGraphQL = $data;
+        } else {
+            throw new SdkException("Only GraphQL string is allowed!");
+        }
+
+        if (!isset($httpHeaders['X-Shopify-Access-Token'])) {
+            throw new SdkException("The GraphQL Admin API requires an access token for making authenticated requests!");
+        }
+
+        self::$httpHeaders = $httpHeaders;
+        self::$httpHeaders['Content-type'] = 'application/graphql';
+
+    }
+
+    /**
+     * Implement a POST request and return json decoded output
+     *
+     * @param string $url
+     * @param mixed $data
+     * @param array $httpHeaders
+     *
+     * @return string
+     */
+    public static function post($url, $data, $httpHeaders = array())
+    {
+        self::prepareRequest($httpHeaders, $data);
+
+        $response = CurlRequest::post($url, self::$postDataGraphQL, self::$httpHeaders);
+
+        return self::processResponse($response);
+    }
+}

lib/HttpRequestJson.php

@@ -25,7 +25,7 @@ class HttpRequestJson
      *
      * @var array
      */
-    private static $httpHeaders;
+    protected static $httpHeaders;
 
     /**
      * Prepared JSON string to be posted with request

lib/ShopifySDK.php

@@ -60,6 +60,9 @@
 | //Get variants of a product (using Child resource)
 | $products = $shopify->Product($productID)->Variant->get();
 |
+| //GraphQL
+| $data = $shopify->GraphQL->post($graphQL);
+|
 */
 use PHPShopify\Exception\SdkException;
 
@@ -97,6 +100,7 @@
  * @property-read Theme $Theme
  * @property-read User $User
  * @property-read Webhook $Webhook
+ * @property-read GraphQL $GraphQL
  *
  * @method AbandonedCheckout AbandonedCheckout(integer $id = null)
  * @method Blog Blog(integer $id = null)
@@ -131,6 +135,7 @@
  * @method Theme Theme(int $id = null)
  * @method User User(integer $id = null)
  * @method Webhook Webhook(integer $id = null)
+ * @method GraphQL GraphQL()
  */
 class ShopifySDK
 {
@@ -194,6 +199,7 @@ class ShopifySDK
         'Theme',
         'User',
         'Webhook',
+        'GraphQL'
     );
 
     /**