Implermented login

src/php/Api/DiscordAPI.php

@@ -0,0 +1,79 @@
+<?php
+declare(strict_types=1);
+
+namespace GamesShop\Api;
+
+use Curl\Curl;
+use Exception;
+use GamesShop\Environment\EnvironmentHandler;
+use GamesShop\Errors\ExtendedException;
+
+final class DiscordAPI
+{
+    const string OAUTH_TOKEN_URL = "https://discord.com/api/oauth2/token";
+    const string USER_ME_URL = 'https://discord.com/api/users/@me';
+
+    public function __construct(
+        private readonly EnvironmentHandler $env
+    )
+    {
+    }
+
+    /**
+     * @return array{id: string, global_name: string, avatar: string, discriminator: int}
+     * @throws Exception
+     */
+    public function getUserFromCode(string $code, string $redirectUri): array {
+        $discordEnv = $this->env->getDiscordEnvironment();
+
+        $curl = new Curl();
+        $curl->setHeader('Content-Type', 'application/x-www-form-urlencoded');
+        $curl->setBasicAuthentication($discordEnv->clientId, $discordEnv->clientSecret);
+
+        $data =[
+            'grant_type' => 'authorization_code',
+            'code' => $code,
+            'redirect_uri' => $redirectUri
+        ];
+        $curl->post(self::OAUTH_TOKEN_URL, $data);
+
+        if ($curl->error) {
+            $curl->diagnose();
+
+            throw new ExtendedException($curl->errorMessage, [ 'response' => $curl->response, 'data' => $data ]);
+        }
+
+        $accessToken = $curl->response->access_token;
+        $tokenType = $curl->response->token_type;
+
+        $curl = new Curl();
+        $curl->setHeader("authorization", "$tokenType $accessToken");
+        $curl->get(self::USER_ME_URL);
+
+        if ($curl->error) {
+            $curl->diagnose();
+
+            throw new ExtendedException($curl->errorMessage, [ 'response' => $curl->response, ]);
+        }
+
+        return [
+            'id' => $curl->response->id,
+            'global_name' => $curl->response->global_name,
+            'avatar' => $curl->response->avatar,
+            'discriminator' => (int) $curl->response->discriminator
+        ];
+    }
+
+    public function getAvatarURL(string $userId, string|int $avatarHash) {
+        if (is_int($avatarHash)) {
+            return "https://cdn.discordapp.com/embed/avatars/{$avatarHash}.png";
+        }
+
+        $extension = 'png';
+        if (str_starts_with($avatarHash, 'a_')) {
+            $extension = 'gif';
+        }
+
+        return "https://cdn.discordapp.com/avatars/{$userId}/{$avatarHash}.{$extension}";
+    }
+}