Add api key finder class and related configurations

src/ApiKeyFinder/CurrentApiKeyFinder.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Osiset\ShopifyApp\ApiKeyFinder;
+
+use Illuminate\Support\Facades\Config;
+use Osiset\ShopifyApp\Contracts\CurrentApiKeyFinderInterface;
+use Osiset\ShopifyApp\Objects\Values\NullableShopDomain;
+
+class CurrentApiKeyFinder implements CurrentApiKeyFinderInterface
+{
+    private const SUPPORTED_KEYS = [
+        'api_key',
+        'api_secret'
+    ];
+
+    public static function resolve(string $key, $shop = null): ?string
+    {
+        $fullKey = "shopify-app.{$key}";
+        if (! $shop || ! in_array($key, self::SUPPORTED_KEYS)) {
+            // No shop passed, return default
+            return Config::get($fullKey);
+        }
+
+        $shopDomain = $shop instanceof NullableShopDomain ? $shop->toNative() : $shop;
+        $shopDomain = explode('.', $shopDomain)[0];
+        $searchKey = "shopify-app.config_api_shop_keys.{$key}_{$shopDomain}";
+
+        if (! Config::has($searchKey)) {
+            return Config::get($fullKey);
+        }
+
+        return Config::get($searchKey);
+    }
+}

src/Contracts/CurrentApiKeyFinderInterface.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Osiset\ShopifyApp\Contracts;
+
+interface CurrentApiKeyFinderInterface
+{
+    public static function resolve(string $key, $shop = null): ?string;
+}

src/Util.php

@@ -181,16 +181,24 @@ public static function getShopifyConfig(string $key, $shop = null)
             );
         }
 
-        // Check if config API callback is defined
-        if (Str::startsWith($key, 'api')
-            && Arr::exists($config, 'config_api_callback')
-            && is_callable($config['config_api_callback'])) {
-            // It is, use this to get the config value
-            return call_user_func(
-                Arr::get($config, 'config_api_callback'),
-                $key,
-                $shop
-            );
+        // Check if config API callback or class is defined
+        if (Str::startsWith($key, 'api')) {
+            if (
+                Arr::exists($config, 'config_api_callback')
+                && is_callable($config['config_api_callback'])
+            ) {
+                // It is, use this to get the config value
+                return call_user_func(
+                    Arr::get($config, 'config_api_callback'),
+                    $key,
+                    $shop
+                );
+            } else if (
+                Arr::exists($config, 'config_api_class')
+                && class_exists($config['config_api_class'])
+            ) {
+                return $config['config_api_class']::resolve($key, $shop);
+            }
         }
 
         return Arr::get($config, $key);

src/resources/config/shopify-app.php

@@ -475,6 +475,7 @@
         'scripttags' => env('SCRIPTTAGS_JOB_CONNECTION', null),
         'after_authenticate' => env('AFTER_AUTHENTICATE_JOB_CONNECTION', null),
     ],
+
     /*
     |--------------------------------------------------------------------------
     | Config API Callback
@@ -487,11 +488,37 @@
     | A closure/callable is required.
     | The first argument will be the key string.
     | The second argument will be something to help identify the shop.
+    | 
+    | This will break caching config values because Closures can not be serialized.
+    | Use config_api_class below instead.
     |
     */
 
     'config_api_callback' => null,
 
+    /*
+    |--------------------------------------------------------------------------
+    | Config API Resolver Class
+    |--------------------------------------------------------------------------
+    |
+    | This option can be used to modify what returns when `getConfig('api_*')`
+    | is used. A use-case for this is modifying the return of `api_secret`
+    | or something similar.
+    |
+    | A class name is required
+    | The class must implement Osiset\ShopifyApp\Contracts\CurrentApiKeyFinderInterface
+    | A default class is provided and can be uncommented below.
+    |
+    | config_api_callback will take priority for backwards-compatibility however,
+    | this option is the recommended way because closures can not be serialized.
+    |
+    */
+
+    // 'config_api_class' => Osiset\ShopifyApp\ApiKeyFinder\CurrentApiKeyFinder::class,
+    // 'config_api_shop_keys' => [
+    //     'api_key_shop-name' => env('API_KEY_SHOPNAME', ''),
+    // ],
+
     /*
     |--------------------------------------------------------------------------
     | Customize Models and Table Name