Add app token repository

src/Accounts/Repository/AppTokenRepository.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace Bitinflow\Accounts\Repository;
+
+use Bitinflow\Accounts\BitinflowAccounts;
+use Bitinflow\Accounts\Contracts\AppTokenRepository as Repository;
+use Bitinflow\Accounts\Exceptions\RequestFreshAccessTokenException;
+use Illuminate\Support\Facades\Cache;
+
+class AppTokenRepository implements Repository
+{
+    public const ACCESS_TOKEN_CACHE_KEY = 'bitinflow-accounts:access_token';
+
+    private BitinflowAccounts $client;
+
+    public function __construct()
+    {
+        $this->client = app(BitinflowAccounts::class);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getAccessToken(): string
+    {
+        $accessToken = Cache::get(self::ACCESS_TOKEN_CACHE_KEY);
+
+        if ($accessToken) {
+            return $accessToken;
+        }
+
+        return $this->requestFreshAccessToken('*');
+    }
+
+    /**
+     * @param string $scope
+     *
+     * @throws RequestFreshAccessTokenException
+     *
+     * @return mixed
+     */
+    private function requestFreshAccessToken(string $scope)
+    {
+        $result = $this->getClient()->retrievingToken('client_credentials', [
+            'scope' => $scope,
+        ]);
+
+        if ( ! $result->success()) {
+            throw RequestFreshAccessTokenException::fromResponse($result->response());
+        }
+
+        Cache::put(self::ACCESS_TOKEN_CACHE_KEY, $accessToken = $result->data()->access_token, now()->addWeek());
+
+        return $accessToken;
+    }
+
+    private function getClient(): BitinflowAccounts
+    {
+        return $this->client;
+    }
+}