Adding Stripe OAuth for connected accountns

app/config/providers.php

@@ -267,6 +267,16 @@ return [ // Ordered by ABC.
         'beta' => false,
         'mock' => false
     ],
+    'stripe' => [
+        'name' => 'Stripe',
+        'developers' => 'https://stripe.com/docs/api',
+        'icon' => 'icon-stripe',
+        'enabled' => true,
+        'sandbox' => false,
+        'form' => false,
+        'beta' => false,
+        'mock' => false
+    ],
     // Keep Last
     'mock' => [
         'name' => 'Mock',

src/Appwrite/Auth/OAuth2/Stripe.php

@@ -0,0 +1,157 @@
+<?php
+
+namespace Appwrite\Auth\OAuth2;
+
+use Appwrite\Auth\OAuth2;
+
+class Stripe extends OAuth2
+{
+    /**
+     * @var array
+     */
+    protected $user = [];
+
+    /**
+     * @var string
+     */
+    protected $stripeAccountId = '';
+
+    /**
+     * @var array
+     */
+    protected $scopes = [
+        'read_write',
+    ];
+
+    /** 
+     * @return string
+     */
+
+    protected $grantType = [
+      'authorize' => 'authorization_code',
+      'refresh' => 'refresh_token'
+    ];
+
+    /**
+     * @return string
+     */
+    public function getName():string
+    {
+        return 'stripe';
+    }
+
+    /**
+     * @return string
+     */
+    public function getLoginURL():string
+    {
+        return 'https://connect.stripe.com/oauth/authorize?'. \http_build_query([
+            'response_type' => 'code', // The only option at the moment is "code."
+            'client_id' => $this->appID,
+            'redirect_uri' => $this->callback,
+            'scope' => \implode(' ', $this->getScopes()),
+            'state' => \json_encode($this->state)
+        ]);
+    }
+
+    /**
+     * @param string $code
+     *
+     * @return string
+     */
+    public function getAccessToken(string $code):string
+    {
+        $response = $this->request(
+            'POST',
+            'https://connect.stripe.com/oauth/token',
+            [],
+            \http_build_query([
+                'grant_type' => $this->grantType['authorize'],                
+                'code' => $code
+            ])
+        );
+
+        $response = \json_decode($response, true);
+        
+        if (isset($response['stripe_user_id'])) {
+          $this->stripeAccountId = $response['stripe_user_id'];
+        }
+
+        if (isset($response['access_token'])) {
+            return $response['access_token'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param $accessToken
+     *
+     * @return string
+     */
+    public function getUserID(string $accessToken):string
+    {
+        $user = $this->getUser($accessToken);
+
+        if (isset($user['id'])) {
+            return $user['id'];
+        }
+
+        return '';
+    }
+
+    /**
+     * @param $accessToken
+     *
+     * @return string
+     */
+    public function getUserEmail(string $accessToken):string
+    {
+        $user = $this->getUser($accessToken);
+        
+        if(empty($user)) {
+          return '';
+        }
+
+        return $user['email'] ?? '';
+    }
+
+    /**
+     * @param $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 $accessToken)
+    {
+        if (empty($this->user) && !empty($this->stripeAccountId)) {
+            $this->user = \json_decode(
+              $this->request(
+                'GET', 
+                'https://api.stripe.com/v1/accounts/' . $this->stripeAccountId, 
+                ['Authorization: Bearer '.\urlencode($accessToken)]
+              ), 
+              true
+            );
+
+            
+        }
+
+        return $this->user;
+    }
+}