Add Feishu (Lark) to the list of supported providers

src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xml

@@ -899,6 +899,46 @@
     </Environment>
   </Provider>
 
+  <!--
+                                                    ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
+                                                    ██ ████ ▄▄▀██ ▄▄▀██ █▀▄██
+                                                    ██ ████ ▀▀ ██ ▀▀▄██ ▄▀███
+                                                    ██ ▀▀ █ ██ ██ ██ ██ ██ ██
+                                                    ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
+  -->
+
+  <Provider Name="Lark" DisplayName="Lark (Feishu)" Id="0822ff2a-c4e7-4e1d-a797-bb24632b3f1a"
+            Documentation="https://open.larksuite.com/document/common-capabilities/sso/web-application-sso/web-app-overview?lang=en-US">
+    <!--
+      Note: Lark serves global users, but it is known as Feishu in China, which has a separate issuer and domain.
+    -->
+
+    <Environment Issuer="https://passport.{settings.Region switch {
+        string region when string.Equals(region, 'CN', StringComparison.OrdinalIgnoreCase)
+            => 'feishu.cn',
+        _ => 'larksuite.com' }}/">
+      <Configuration AuthorizationEndpoint="https://passport.{settings.Region switch {
+        string region when string.Equals(region, 'CN', StringComparison.OrdinalIgnoreCase)
+            => 'feishu.cn',
+        _ => 'larksuite.com' }}/suite/passport/oauth/authorize"
+                     TokenEndpoint="https://passport.{settings.Region switch {
+        string region when string.Equals(region, 'CN', StringComparison.OrdinalIgnoreCase)
+            => 'feishu.cn',
+        _ => 'larksuite.com' }}/suite/passport/oauth/token"
+                     UserinfoEndpoint="https://passport.{settings.Region switch {
+        string region when string.Equals(region, 'CN', StringComparison.OrdinalIgnoreCase)
+            => 'feishu.cn',
+        _ => 'larksuite.com' }}/suite/passport/oauth/userinfo">
+
+        <GrantType Value="authorization_code" />
+        <GrantType Value="refresh_token" />
+      </Configuration>
+    </Environment>
+
+    <Setting PropertyName="Region" ParameterName="region" Type="String" Required="false" DefaultValue="Global"
+             Description="The Lark (Feishu) service region ('Global' for the global Lark by default, or can be set to 'CN' for Feishu)" />
+  </Provider>
+
   <!--
                                           ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
                                           ██ ████▄ ▄██ ▄▄▀██ ██ ██ ▄▄▄██ ▄▄▄ ██ ▄▄▄ ██