# Configure OAuth Authentication

To retrieve information from Yammer you must go to the Azure portal and register an application to represent the connector. You must then configure the connector to authenticate using OAuth.

For more information about creating applications and using OAuth, refer to the Microsoft documentation.

To configure OAuth for Yammer Connector

1. Go to the Microsoft Azure Portal.

2. Click New registration.

   1. Type a name for the new application.

   2. Specify a redirect URL. The "type" of the redirect URL should be "Web".

      - To use the NiFi Ingest connector, the redirect URL must match the URL shown in the advanced configuration dialog of the NiFi processor.
      - To use the standard connector, the redirect URL must match the value of the `RedirectUrl` parameter in the OAuth tool configuration file, `oauth_tool.cfg`. The default value is `http://localhost:7878/oauth`.
3. Click Certificates and Secrets and create a new client secret.

4. Click API Permissions > Add a permission.

   The Request API permissions dialog box opens.

5. Click Yammer and select the following permissions.

   Permission | Required For
   --- | ---
   user_impersonation | Retrieving data from Yammer

6. Run the OAuth configuration tool that is supplied with the connector.

   - To configure the NiFi Ingest connector

     1. In the NiFi web interface, right-click the processor and click Configure.
     2. Click ADVANCED, and complete the guided setup wizard. Then configure OAuth using the OAUTH SETUP tab.

   - To configure the standard connector

     1. Open the folder where you installed the connector.
     2. Open the OAuth tool configuration file, `oauth_tool.cfg`, in a text editor.

     3. In the `[Default]` section, set any SSL or proxy settings that are required to access the repository:

        `SSLMethod` | The version of SSL/TLS to use.
        `ProxyHost` | The host name or IP address of the proxy server to use.
        `ProxyPort` | The port of the proxy server to use.

        For example:

            SSLMethod=NEGOTIATE
            ProxyHost=10.0.0.1
            ProxyPort=8080

     4. In the `[OAuthTool]` section, set the following parameters:

        `AuthorizeUrl` | Replace the placeholder `{TenantId}` with your Microsoft 365 Tenant, for example `mydomain.onmicrosoft.com`.
        `TokenUrl` | Replace the placeholder `{TenantId}` with your Microsoft 365 Tenant, for example `mydomain.onmicrosoft.com`.
        `RefreshUrl` | Replace the placeholder `{TenantId}` with your Microsoft 365 Tenant, for example `mydomain.onmicrosoft.com`.
        `AppKey` | The application key of the application you created to represent the connector.
        `AppSecret` | The client secret you obtained in step 3.

     5. Open a command-line window and run the following command:

        `oauth_tool.exe oauth_tool.cfg OAuthTool`

        A web browser opens, asking you to log in and grant consent.

     6. Log in and grant consent.

        The web page displays a message stating that the OAuth details have been successfully stored, and the OAuth tool creates the files `oauth.cfg` and `oauth2_sites.bin`. When you configure the connector, import the parameters from `oauth.cfg` into your task configuration. For more information about including parameters from another file, see Include an External Configuration File.

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