feat: added Gitlab OAuth Support

app/config/providers.php

@@ -19,7 +19,7 @@ return [
     'gitlab' => [
         'developers' => 'https://docs.gitlab.com/ee/api/',
         'icon' => 'icon-gitlab',
-        'enabled' => false,
+        'enabled' => true,
     ],
     'google' => [
         'developers' => 'https://developers.google.com/',

src/Auth/OAuth/Gitlab.php

@@ -0,0 +1,127 @@
+<?php
+
+namespace Auth\OAuth;
+
+use Auth\OAuth;
+
+class Gitlab extends OAuth
+{
+    /**
+     * @var string
+     */
+    // protected $version = 'v4';
+    /**
+     * @var array
+     */
+    protected $user = [];
+
+    /**
+     * @return string
+     */
+    public function getName(): string
+    {
+        return 'gitlab';
+    }
+
+    /**
+     * @return string
+     */
+    public function getLoginURL(): string
+    {
+        return 'https://gitlab.com/oauth/authorize?' .
+            'client_id=' . urlencode($this->appID) .
+            '&redirect_uri=' . urlencode($this->callback) .
+            '&scope=read_user' .
+            '&state=' . urlencode(json_encode($this->state)) .
+            '&response_type=code';
+    }
+
+    /**
+     * @param string $code
+     *
+     * @return string
+     */
+    public function getAccessToken(string $code): string
+    {
+        $accessToken = $this->request(
+            'POST',
+            'https://gitlab.com/oauth/token?'.
+                'code=' . urlencode($code) .
+                '&client_id=' . urlencode($this->appID) .
+                '&client_secret=' . urlencode($this->appSecret) .
+                '&redirect_uri=' . urlencode($this->callback) .
+                '&grant_type=authorization_code'
+        );
+
+        $accessToken = json_decode($accessToken, true);
+
+        if (isset($accessToken['access_token'])) {
+            return $accessToken['access_token'];
+        }
+
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return string
+     */
+    public function getUserID(string $accessToken): string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['id'])) {
+            return $user['id'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return string
+     */
+    public function getUserEmail(string $accessToken): string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['email'])) {
+            return $user['email'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return string
+     */
+    public function getUserName(string $accessToken): string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['name'])) {
+            return $user['name'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param string $accessToken
+     *
+     * @return array
+     */
+    protected function getUser(string $accessToken): array
+    {
+        if (empty($this->user)) {
+            $user = $this->request('GET', 'https://gitlab.com/api/v4/user?access_token=' . urlencode($accessToken));
+            $this->user = json_decode($user, true);
+        }
+        return $this->user;
+    }
+}