Access services with OAuth credentials

Learn how to implement user authentication to access a secure ArcGIS service with OAuth credentials.

You can use different types of authentication to access secured ArcGIS services. To implement OAuth credentials for user authentication, you can use your ArcGIS account to register an app with your portal and get a Client ID, and then configure your app to redirect users to login with their credentials when the service or content is accessed. This is known as user authentication. If the app uses premium ArcGIS Online services that consume credits, for example, the app user's account will be charged.

In this tutorial, you will build an app that implements user authentication using OAuth credentials so users can sign in and be authenticated through ArcGIS Online to access the ArcGIS World Traffic service.

Prerequisites

Steps

Create OAuth credentials for user authentication

OAuth credentials are required to implement user authentication. These credentials are created as an Application item in your organization's portal.

1. Go to the Create OAuth credentials for user authentication tutorial and create OAuth credentials using your ArcGIS Location Platform or ArcGIS Online account.

2. Copy the Client ID and Redirect URL as you will use them to implement user authentication in the next step. The Client ID is found on the Application item's Overview page, while the Redirect URL is found on the Settings page.

Open a Java project with Gradle

1. To start this tutorial, complete the Display a map tutorial, or download and unzip the Display a map solution into a new folder.

2. Open the build.gradle file as a project in IntelliJ IDEA.

3. Delete the code that sets your API Key. Since your app will be using OAuth, you will not need an API Key.

   App.java

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       ArcGISRuntimeEnvironment.setApiKey("YOUR_ACCESS_TOKEN");
   

Prepare files before coding the app

Modify the files from the Display a map tutorial so they can be used in this tutorial: you will add imports, change the application title, and modify the view point's scale.

1. In IntelliJ IDEA, locate the Project tool window, open src/main/java/com.example.app, and double-click App. Add the following imports, replacing those from the Display a map tutorial.

   Project tool window vs Project view

   1. In the main menu of IntelliJ IDEA, click View > Tool Windows > Project. The Project Tool window displays, with a vertical tab on the left that says Project.

   2. Inside the Project tool window, your view name should also be Project. If the view name is something else (such as Packages or Project Files), click on the leftmost control in the title bar of the Project tool window, and select Project from the drop-down list.

   
   App.java

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   package com.example.app;
   
   import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
   import javafx.application.Application;
   import javafx.scene.Scene;
   import javafx.scene.layout.StackPane;
   import javafx.stage.Stage;
   
   import com.esri.arcgisruntime.layers.ArcGISMapImageLayer;
   import com.esri.arcgisruntime.mapping.ArcGISMap;
   import com.esri.arcgisruntime.mapping.BasemapStyle;
   import com.esri.arcgisruntime.mapping.Viewpoint;
   import com.esri.arcgisruntime.mapping.view.MapView;
   import com.esri.arcgisruntime.security.AuthenticationManager;
   import com.esri.arcgisruntime.security.DefaultAuthenticationChallengeHandler;
   import com.esri.arcgisruntime.security.OAuthConfiguration;
   
   public class App extends Application {
   

2. In the start() life cycle method, change the title that will appear on the application window to Access services with OAuth 2.0. In addition, add the try statement, which will be closed later on in the tutorial.

   App.java

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     @Override
     public void start(Stage stage) {
   
       try {
   
         // set title, size, and add scene to stage
         stage.setTitle("Access services with OAuth 2.0");
   
         stage.setWidth(800);
         stage.setHeight(700);
         stage.show();
   

3. Change the scale of the map's initial viewpoint to 72000. This scale will make the secured layer visible without zooming in.

   App.java

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         ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
   
         // set the map on the map view
         mapView.setMap(map);
   
         mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 72000.0 ));
   

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Implement user authentication using OAuth 2.0

This API abstracts some of the details for user authentication using OAuth credentials in your app. You can use classes such as AuthenticationManager to request, store, and manage credentials for secure resources.

Add code to set up the AuthenticationManager, which launches a small browser window titled Authentication Required. The user must enter log-in credentials before proceeding.

1. In the start() method, after the line that calls mapView.setViewpoint(), create an OAuthConfiguration.

   App.java

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         mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 72000.0 ));
   
         // set up an OAuth config with URL to portal, a Client ID and a Redirect URL
         OAuthConfiguration oAuthConfiguration = new OAuthConfiguration("YOUR-ORGANIZATION-URL", "YOUR-APP-CLIENT-ID", "YOUR-APP-REDIRECT-URL");
   
   

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   OAuthConfiguration constructor parameters

   The OAuthConfiguration constructor takes three parameters:

   • "YOUR-ORGANIZATION-URL": the URL for your organization's portal associated with the ArcGIS Location Platform or ArcGIS Online account you signed in with during Create OAuth credentials for user authentication above.

   • "YOUR-APP-CLIENT-ID": the Client ID from your Application item's Overview tab in your portal.

   • "YOUR-APP-REDIRECT-URL": the Redirect URL from your Application item's Settings tab in your portal.

2. Create a DefaultAuthenticationChallengeHandler and set it on the AuthenticationManager. Then add the oAuthConfiguration to the AuthenticationManager.

   App.java

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         mapView.setViewpoint(new Viewpoint(34.02700, -118.80543, 72000.0 ));
   
         // set up an OAuth config with URL to portal, a Client ID and a Redirect URL
         OAuthConfiguration oAuthConfiguration = new OAuthConfiguration("YOUR-ORGANIZATION-URL", "YOUR-APP-CLIENT-ID", "YOUR-APP-REDIRECT-URL");
   
         // set up the authentication manager to handle authentication challenges
         DefaultAuthenticationChallengeHandler defaultAuthenticationChallengeHandler = new DefaultAuthenticationChallengeHandler();
         AuthenticationManager.setAuthenticationChallengeHandler(defaultAuthenticationChallengeHandler);
         // add the OAuth configuration
         AuthenticationManager.addOAuthConfiguration(oAuthConfiguration);
   

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3. Create a file named style.css to specify the visual display of the Authentication Required browser window.

   1. In the Project tool window, open src > main and right-click the main folder. In the context menu, click New > Directory and click resources under Gradle Source Sets. Hit Enter to create the folder.

   2. In the Project tool window, right-click the resources folder. In the context menu, click New > File and name the file style.css.

   3. Copy the code displayed below and paste it into the style.css file.

      style.css

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      .panel-region .label {
        -fx-text-fill: white;
      }
      
      .label {
        -fx-text-fill: black;
      }
      
      .slider .axis {
          -fx-tick-label-fill: white;
      }
      
      .range-slider .axis {
          -fx-tick-label-fill: white;
      }
      
      .panel-region .check-box {
         -fx-text-fill: white;
      }
      
      .panel-region .radio-button {
         -fx-text-fill: white;
      }
      
      .color-picker .color-picker-label {
         -fx-text-fill: black;
      }

Add a traffic layer

You will add a layer to display the ArcGIS World Traffic service, a dynamic map service that presents historical and near real-time traffic information for different regions in the world. This is a secure service and requires an ArcGIS Online organizational subscription.

1. Create an ArcGISMapImageLayer to display the traffic service. Then add the layer to the map's collection of data layers (operational layers). In addition, you'll add the catch statement that corresponds to the try statement added earlier in the tutorial.

   App.java

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         // set up an OAuth config with URL to portal, a Client ID and a Redirect URL
         OAuthConfiguration oAuthConfiguration = new OAuthConfiguration("YOUR-ORGANIZATION-URL", "YOUR-APP-CLIENT-ID", "YOUR-APP-REDIRECT-URL");
   
         // set up the authentication manager to handle authentication challenges
         DefaultAuthenticationChallengeHandler defaultAuthenticationChallengeHandler = new DefaultAuthenticationChallengeHandler();
         AuthenticationManager.setAuthenticationChallengeHandler(defaultAuthenticationChallengeHandler);
         // add the OAuth configuration
         AuthenticationManager.addOAuthConfiguration(oAuthConfiguration);
   
         ArcGISMapImageLayer trafficLayer = new ArcGISMapImageLayer("https://traffic.arcgis.com/arcgis/rest/services/World/Traffic/MapServer");
   
         map.getOperationalLayers().add(trafficLayer);
       } catch (Exception e) {
         // on any error, display the stack trace.
         e.printStackTrace();
       }
   
     }
   

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2. Run the app. Ensure to run the app as a Gradle task and not as an application in your IDE. In the Gradle tool window, under Tasks > application, double-click run.

You should initially see the map with the topographic basemap layer centered on the Santa Monica Mountains in California. You will then be prompted for an ArcGIS Online username and password. After you authenticate successfully with ArcGIS Online, the traffic layer will appear in the map.