Alicloud OAuth provider doc

doc/integration/alicloud.md

+---
+stage: Ecosystem
+group: Integrations
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
+---
+
+# Use AliCloud as an OmniAuth authentication provider **(FREE)**
+
+You can enable the AliCloud OAuth 2.0 OmniAuth provider and sign in to
+GitLab using your AliCloud account.
+
+## Create an AliCloud application
+
+Sign in to the AliCloud platform and create an application on it. AliCloud generates a client ID and secret key for you to use.
+
+1. Sign in to the [AliCloud platform](https://account.aliyun.com/login/login.htm).
+
+1. Go to the [OAuth application management page](https://ram.console.aliyun.com/applications).
+
+1. Select **Create Application**.
+
+1. Fill in the application details:
+
+   - **Application Name**: This can be anything.
+   - **Display Name**: This can be anything.
+   - **Callback URL**: This URL should be formatted as `'GitLab instance URL' + '/users/auth/alicloud/callback'`. For example, `http://test.gitlab.com/users/auth/alicloud/callback`.
+
+   Select **Save**.
+
+1. Add OAuth scopes in the application details page:
+ 
+   1. Under the **Application Name** column, select the name of the application you created. The application's details page opens.
+   1. Under the **Application OAuth Scopes** tab, select **Add OAuth Scopes**.
+   1. Select the **aliuid** and **profile** checkboxes.
+   1. Select **OK**.
+
+   ![AliCloud OAuth scope](img/alicloud_scope.png)
+
+1. Create a secret in the application details page:
+
+   1. Under the **App Secrets** tab, select **Create Secret**.
+   1. Copy the SecretValue generated.
+
+## Enable AliCloud OAuth in GitLab
+
+1. On your GitLab server, open the configuration file.
+
+   - **For Omnibus installations**
+
+     ```shell
+     sudo editor /etc/gitlab/gitlab.rb
+     ```
+
+   - **For installations from source**
+
+     ```shell
+     cd /home/git/gitlab
+
+     sudo -u git -H editor config/gitlab.yml
+     ```
+
+1. [Configure the initial settings](omniauth.md#configure-initial-settings).
+
+1. Add the provider configuration. Replace `YOUR_APP_ID` with the ID on the application details page
+   and `YOUR_APP_SECRET` with the **SecretValue** you got when you registered the AliCloud application.
+
+   - **For Omnibus installations**
+
+     ```ruby
+       gitlab_rails['omniauth_providers'] = [
+         {
+           name: "alicloud",
+           app_id: "YOUR_APP_ID",
+           app_secret: "YOUR_APP_SECRET"
+         }
+       ]
+     ```
+
+   - **For installations from source**
+
+     ```yaml
+     - { name: 'alicloud',
+         app_id: 'YOUR_APP_ID',
+         app_secret: 'YOUR_APP_SECRET' }
+     ```
+
+1. Save the configuration file.
+
+1. [Reconfigure GitLab](../administration/restart_gitlab.md#omnibus-gitlab-reconfigure)
+   if you installed using Omnibus, or [restart GitLab](../administration/restart_gitlab.md#installations-from-source)
+   if you installed from source.

doc/integration/omniauth.md

@@ -21,6 +21,7 @@ GitLab supports the following OmniAuth providers.
 
 | Provider documentation                                              | OmniAuth provider name     |
 |---------------------------------------------------------------------|----------------------------|
+| [AliCloud](alicloud.md)                                             | `alicloud`                 |
 | [Atlassian Crowd](../administration/auth/crowd.md)                  | `crowd`                    |
 | [Atlassian](../administration/auth/atlassian.md)                    | `atlassian_oauth2`         |
 | [Auth0](auth0.md)                                                   | `auth0`                    |