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

Before starting this tutorial:

You need an ArcGIS Location Platform or ArcGIS Online account.
Confirm that your system meets the system requirements.
An IDE for Android development in Kotlin.

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.

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

You'll use the Client ID and Redirect URL when implementing OAuth in your app's code. The Client ID is found on the Application item's Overview page, while the Redirect URL is found on the Settings page.

The Client ID uniquely identifies your app on the authenticating server. If the server cannot find an app with the provided Client ID, it will not proceed with authentication.

The Redirect URL is used to identify a response from the authenticating server when the system returns control back to your app after an OAuth sign in. You can configure several redirect URLs in your application definition and can remove or edit them. It's important to make sure the redirect URL used in your app's code matches a redirect URL configured for the application.

Open an Android Studio project with Gradle

To start this tutorial, complete the Display a map tutorial. Or download and unzip the Display a map solution in a new folder.
Modify the old project for use in this new tutorial. Expand More info for instructions.
1. On your file system, delete the .idea folder, if present, at the top level of your project.
2. In the Android tool window, open app > res > values > strings.xml.
  
  In the <string name="app_name"> element, change the text content to Access services with OAuth 2.0.
  strings.xml
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  Change line
  1 2 3 4 5 6 7 8 9 <resources> <string name="app_name">Access services with OAuth 2.0</string> </resources>
3. In the Android tool window, open Gradle Scripts > settings.gradle.
  
  Change the value of rootProject.name to "Access services with OAuth 2.0".
  settings.gradle
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  Change line
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 rootProject.name = "Access services with OAuth 2.0" include ':app'
4. Click File > Sync Project with Gradle files. Android Studio will recognize your changes and create a new .idea folder.

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

MainActivity.kt
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Remove line    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContentView(activityMainBinding.root)

        setApiKeyForApp()

        setupMap()

    }
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MainActivity.kt
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Remove lineRemove lineRemove lineRemove lineRemove line    override fun onDestroy() {
        mapView.dispose()
        super.onDestroy()
    }

    private fun setApiKeyForApp(){

        ArcGISRuntimeEnvironment.setApiKey("YOUR_ACCESS_TOKEN")

    }
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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, modify the view point's scale, define strings for OAuth Client ID and Redirect URL, and add an Android activity for the default OAuth intent receiver.

In the Project tool window, make sure that the Android view is displayed. Open app/java/com.example.app, and click MainActivity.kt. Add the following imports, replacing those from the Display a map tutorial.

MainActivity.kt
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package com.example.app

import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity

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
import com.example.app.databinding.ActivityMainBinding

import java.net.MalformedURLException


class MainActivity : AppCompatActivity() {

Change the scale of the map's initial viewpoint to 72000.0. This scale will make the secured layer visible without zooming in.

MainActivity.kt
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      val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC)

      mapView.map = map

      mapView.setViewpoint(Viewpoint(34.02700, -118.80543, 72000.0))
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Open app/res/values and click strings.xml. Enter certain values that you specified while creating your OAuth credentials in Create OAuth credentials above.

In string.xml define strings for the OAuth Client ID, redirect host and uri. Replace the placeholder strings with values from your actual OAuth credentials. The replacement values are not quoted.
- "YOUR_CLIENT_ID": Replace with the Client ID for your app.
- "YOUR_REDIRECT_HOST": Replace with the host name portion of your Redirect URL that follows ://. Above, we suggested using auth.
- "YOUR_REDIRECT_URI": Replace with the protocol identifier of your Redirect URL that precedes ://. This must be my-app.
strings.xml
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```
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<resources>

    <string name="app_name">Access services with OAuth 2.0</string>

    <string name="oauth_client_id">YOUR_CLIENT_ID</string>
    <string name="oauth_redirect_host">YOUR_REDIRECT_HOST</string>
    <string name="oauth_redirect_uri">YOUR_REDIRECT_URI</string>

</resources>
```

Open app/manifests and click AndroidManifest.xml. Add an activity for the default OAuth intent receiver.

AndroidManifest.xml
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        <!-- You must declare this activity, an intent receiver, to display the OAuth sign in -->
        <activity
            android:exported="true"
            android:name="com.esri.arcgisruntime.security.DefaultOAuthIntentReceiver"
            android:launchMode="singleTask">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />

                <data
                    android:host="@string/oauth_redirect_host"
                    android:scheme="authenticate-with-oauth" />
            </intent-filter>
        </activity>

    </application>
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Implement user authentication using OAuth credentials

ArcGIS Runtime provides an API that abstracts some of the details for user authentication using OAuth 2.0 in your app. You can use classes like AuthenticationManager to request, store, and manage credentials for secure resources.

Add code to set up the AuthenticationManager . This launches a browser window that challenges the user for sign in credentials.

In the setupMap() function, after the line that calls mapView.setViewpoint(), create an OAuthConfiguration .
MainActivity.kt
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      mapView.setViewpoint(Viewpoint(34.02700, -118.80543, 72000.0))

      // set up an OAuth config with URL to portal, a Client ID and a Redirect URL
      val oAuthConfiguration = OAuthConfiguration(
        null, getString(R.string.oauth_client_id),
        getString(R.string.oauth_redirect_uri) + "://" + getString(R.string.oauth_redirect_host)
      )
```
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The OAuthConfiguration constructor takes three parameters:
- R.string.oauth_client_id: the URL for your organization's portal associated with the ArcGIS Location Platform account or ArcGIS Online account you signed in with during Create OAuth credentials above.
  Note
  If you can't remember the URL associated with your ArcGIS Location Platform or ArcGIS Online account, do the following:
  
  Sign In to your portal with your ArcGIS Location Platform or ArcGIS Online account.
  
  The URL for your organization will be visible in the browser's address bar. The format of the URL is: https://<short-name>.maps.arcgis.com.
- "R.string.oauth_client_id": the Client ID from your Application item's Overview page in your portal.
- "R.string.oauth_redirect_uri" + "R.string.oauth_redirect_host": the protocol identifier and host name of the Redirect URL from your Application item's Settings tab in your portal.

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

MainActivity.kt
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      mapView.setViewpoint(Viewpoint(34.02700, -118.80543, 72000.0))

      // set up an OAuth config with URL to portal, a Client ID and a Redirect URL
      val oAuthConfiguration = OAuthConfiguration(
        null, getString(R.string.oauth_client_id),
        getString(R.string.oauth_redirect_uri) + "://" + getString(R.string.oauth_redirect_host)
      )

      // setup AuthenticationManager to handle auth challenges
      val defaultAuthenticationChallengeHandler = DefaultAuthenticationChallengeHandler(this)

      // use the DefaultChallengeHandler to handle authentication challenges
      AuthenticationManager.setAuthenticationChallengeHandler(
        defaultAuthenticationChallengeHandler
      )

      // add an OAuth configuration
      // NOTE: you must add the DefaultOAuthIntentReceiver Activity to the app's manifest to handle starting a browser
      AuthenticationManager.addOAuthConfiguration(oAuthConfiguration)
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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 service requires an ArcGIS Online organizational subscription.

ArcGIS World Traffic service data is updated every five minutes to provide traffic speed and traffic incident visualization and identification.

Traffic speeds are displayed as a percentage of free-flow speeds, which is frequently the speed limit or how fast cars tend to travel when unencumbered by other vehicles. The streets are color coded as follows:

Green (fast): 85 - 100% of free flow speeds
Yellow (moderate): 65 - 85%
Orange (slow); 45 - 65%
Red (stop and go): 0 - 45%

Finally, you will add error code that catches a malformed URL and displays a Toast with the error message.

Create an ArcGISMapImageLayer to display the traffic service. Then add the layer to the map's collection of data layers (operational layers).

MainActivity.kt
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Add line.Add line.      // add an OAuth configuration
      // NOTE: you must add the DefaultOAuthIntentReceiver Activity to the app's manifest to handle starting a browser
      AuthenticationManager.addOAuthConfiguration(oAuthConfiguration)

      val trafficLayer = ArcGISMapImageLayer("https://traffic.arcgis.com/arcgis/rest/services/World/Traffic/MapServer")
      map.operationalLayers.add(trafficLayer)
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Enclose the code of setupMap() using a try clause. Follow the try with a catch clause that takes a MalformedURLException and calls logError().

MainActivity.kt
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Add line.Add line.Add line.Add line.Add line.  private fun setupMap() {

    try {

      val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC)

      mapView.map = map

      mapView.setViewpoint(Viewpoint(34.02700, -118.80543, 72000.0))

      // set up an OAuth config with URL to portal, a Client ID and a Redirect URL
      val oAuthConfiguration = OAuthConfiguration(
        null, getString(R.string.oauth_client_id),
        getString(R.string.oauth_redirect_uri) + "://" + getString(R.string.oauth_redirect_host)
      )

      // setup AuthenticationManager to handle auth challenges
      val defaultAuthenticationChallengeHandler = DefaultAuthenticationChallengeHandler(this)

      // use the DefaultChallengeHandler to handle authentication challenges
      AuthenticationManager.setAuthenticationChallengeHandler(
        defaultAuthenticationChallengeHandler
      )

      // add an OAuth configuration
      // NOTE: you must add the DefaultOAuthIntentReceiver Activity to the app's manifest to handle starting a browser
      AuthenticationManager.addOAuthConfiguration(oAuthConfiguration)

      val trafficLayer = ArcGISMapImageLayer("https://traffic.arcgis.com/arcgis/rest/services/World/Traffic/MapServer")
      map.operationalLayers.add(trafficLayer)

    }

    catch (e: MalformedURLException) {
      logError("Error in OAuthConfiguration URL: " + e.message)
    }

  }
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Within the MainActivity class, create the logError() function that takes a String parameter and displays a Toast containing the message.

MainActivity.kt
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Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.  /**
   * Log an error to logcat and to the screen via Toast.
   * @param message the text to log.
   */
  private fun logError(message: String?) {
    message?.let {
      Log.e(TAG, message)
      Toast.makeText(this, message, Toast.LENGTH_LONG).show()
    }
  }
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Click Run > Run > app to run the app.

You should see the map with the topographic basemap layer centered on the Santa Monica Mountains in California. You will also see the traffic layer, with its symbology of green, yellow, orange, and red roads to indicate current traffic flow. This is a secured layer, which is visible in your app because the user has entered valid ArcGIS Online username and password.