Access services with OAuth 2.0

Learn how to authenticate a user to access a secure ArcGIS service with OAuth 2.0.

In this tutorial, you will build an app that uses named user login credentials to access a secure ArcGIS service using OAuth 2.0.

You can use different authentication methods to access ArcGIS location services. To implement OAuth 2.0, you can use your ArcGIS account to register an application 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 "named user" or ArcGIS identity authentication. If the app uses premium services that consume credits, the app user's account will be charged.

You will implement OAuth 2.0 so users can sign in to ArcGIS to access the ArcGIS World Traffic service.

Prerequisites

Steps

Download the ArcGIS Maps SDK for Qt Toolkit

The open-source ArcGIS Maps SDK for Qt Toolkit contains UI components and utilities to help simplify your Qt app development. For this OAuth tutorial app we will use the toolkit that provides the AuthenticationView class, which has a dialog that automatically displays the proper authentication view for any of the supported authentication types (OAuth, Token, HTTP Basic, HTTP Digest, SAML, PKI).

1. To configure the toolkit for use in this tutorial, you need to copy the ArcGIS Maps SDK for Qt Toolkit repository in GitHub onto your development machine.

2. You can do this by cloning the ArcGIS Maps SDK for Qt Toolkit repo (using the the URL: https://github.com/Esri/arcgis-maps-sdk-toolkit-qt.git) or downloading the .zip version of the repo and unzipping it to your preferred location on your development machine.

IMPORTANT: Make a particular note for the path to the toolkitcpp.pri file that is in the directory structure of the toolkit on your devlopement machine. You will need to reference the path to this file later in the tutorial (for example: C:/arcgis-maps-sdk-toolkit-qt/uitools/toolkitcpp.pri).

Configure OAuth 2.0 for your app

Use the ArcGIS Developer dashboard to create an application, generate a client ID, and define a redirect URL to access secure services.

1. Sign in to your ArcGIS developer account. If you don't already have one, sign-up for free. You need to sign in so you can create an application and get a client ID for authentication.
2. Click the OAuth 2.0 tab in the ribbon at the top.
3. Click the New Application button in the upper-left of the page.
4. In the Create New Application window, provide a Name and an optional Description for your application definition. Then click Create application. When the application is created, Client ID, Client Secret, and Temporary Token values will also be generated. Take note of the Client ID; you will use this when implementing OAuth for your app.
5. Click the Add URI button at the bottom of the page to add a redirect URL.
6. In the Add Allowed URI window, type urn:ietf:wg:oauth:2.0:oob and click Add URI.

IMPORTANT: Make a particular note for the Client ID string that is generated. You will need to use this string later in the tutorial (for example: XYZ123).

Open the project in Qt Creator

1. To start this tutorial, complete the Display a map tutorial or download and unzip the solution.
2. Open the display_a_map project in Qt Creator.

Configure the .pro file

Qt .pro files contains information required by qmake to build an application, a library, or a plugin.

1. To utilize AuthenticationView, add the path to where the toolkitcpp.pri file is located on your development system (for example: C:/arcgis-maps-sdk-toolkit-qt/uitools/toolkitcpp.pri). Also, Qt WebEngine Quick is a Qt module that can display an OAuth login webpage in your app. Add this module to your project. Then save and close display_a_map.pro.

   display_a_map.pro

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   ARCGIS_RUNTIME_VERSION = 200.1.0
   include($$PWD/arcgisruntime.pri)
   
   include(<path_to_toolkit_repo>/uitools/toolkitcpp.pri) # example: C:/arcgis-maps-sdk-toolkit-qt/uitools/toolkitcpp.pri
   
   qtHaveModule(webenginequick) {
     QT += webenginequick
   }
   

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Implement OAuth login for this app

The OAuth login web page is implemented using the AuthenticationView class and the Qt WebEngine, which is part of the ArcGIS Toolkit.

1. In the project Sources folder, open main.cpp. Remove these #include statements. These Qt types are not needed for this tutorial.

   main.cpp

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   #include "Display_a_map.h"
   
   #include "ArcGISRuntimeEnvironment.h"
   #include "MapQuickView.h"
   
   #include <QDir>
   #include <QGuiApplication>
   #include <QQmlApplicationEngine>
   

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2. Add #include statements for QtWebEngineQuick, and register.h for the Toolkit.

   main.cpp

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   #include "Display_a_map.h"
   #include "ArcGISRuntimeEnvironment.h"
   #include "MapQuickView.h"
   
   #include <QtWebEngineQuick>
   #include "Esri/ArcGISRuntime/Toolkit/register.h"
   

3. Add code to initialize QtWebEngineQuick.

   main.cpp

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   using namespace Esri::ArcGISRuntime;
   
   int main(int argc, char *argv[])
   {
       QGuiApplication app(argc, argv);
   
       QtWebEngineQuick::initialize();
   

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4. Register the Toolkit. Then save and close main.cpp.

   main.cpp

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       // Register the Display_a_map (QQuickItem) for QML
       qmlRegisterType<Display_a_map>("Esri.Display_a_map", 1, 0, "Display_a_map");
   
       // Initialize application view
       QQmlApplicationEngine engine;
   
       // Register the toolkit
       Esri::ArcGISRuntime::Toolkit::registerComponents(engine);
   

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5. Navigate to Resources > qml\qml.qrc > qml and open Display_a_mapForm.qml. Import the Toolkit. Be sure set the version to your installed ArcGIS Maps SDK for Qt version.

   Display_a_mapForm.qml

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   import QtQuick
   import QtQuick.Controls
   import Esri.Display_a_map
   
   import Esri.ArcGISRuntime.Toolkit
   

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6. Now that the toolkit is available, declare an AuthenticationView component. Then save and close Display_a_mapForm.qml.

   More info

   AuthenticationView is a Toolkit component that simplifies the authentication workflow by using AuthenticationManager to automatically display the correct login user interface for each security method (Token, OAuth, PKI, etc.). For more information, see AuthenticationView.
   Display_a_mapForm.qml

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       // Declare the C++ instance which creates the map etc. and supply the view
       Display_a_map {
           id: model
           mapView: view
       }
   
       // Declare an AuthenticationView to support login.
       AuthenticationView {
           id: authView
           anchors.fill: parent
       }
   

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Add required class header files

Several additional classes are required to support the functionality your app needs. Specifically, for managing OAuth authentication, creating a credential, creating an image layer, and accessing the secured traffic layer portal item.

1. In the project Sources folder, open Display_a_map.cpp. Add #include statements for the required header files as shown.

   Display_a_map.cpp

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   #include "Display_a_map.h"
   #include "Map.h"
   #include "MapTypes.h"
   #include "MapQuickView.h"
   #include "Point.h"
   #include "Viewpoint.h"
   #include "SpatialReference.h"
   #include "TaskWatcher.h"
   
   // Tutorial add six includes
   #include "Credential.h"
   #include "OAuthClientInfo.h"
   #include "Portal.h"
   #include "PortalItem.h"
   #include "ArcGISMapImageLayer.h"
   #include "CoreTypes.h"
   #include "LayerListModel.h"
   

Create a credential and portal to access secured services

You can use an instance of the Portal class to access services hosted on ArcGIS Online or an ArcGIS Enterprise portal. In the constructor, you can either provide the portal URL or leave it out to use ArcGIS Online by default. You can also provide a Credential in the constructor to use when accessing secured resources.

1. In the setupViewpoint function, add the following code to create Credential. Paste your Client ID (created earlier with the OAuth2 applications dashboard) to replace the "CLIENT_ID" placeholder. Also be sure that OAuthMode is set to User.

   Display_a_map.cpp

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   void Display_a_map::setupViewpoint()
   {
   
       const Point center(-118.80543, 34.02700, SpatialReference::wgs84());
       const Viewpoint viewpoint(center, 100000.0);
       m_mapView->setViewpoint(viewpoint);
   
       // Create a credential for this app and set the authentication mode.
        Credential* credential = new Credential(OAuthClientInfo("CLIENT_ID", OAuthMode::User), this); // Change the CLIENT_ID to your string, example "XYZ123"
   

2. Create a Portal that will use credential to gain access to a secured ArcGIS service, the traffic layer resource.

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       const Point center(-118.80543, 34.02700, SpatialReference::wgs84());
       const Viewpoint viewpoint(center, 100000.0);
       m_mapView->setViewpoint(viewpoint);
   
       // Create a credential for this app and set the authentication mode.
        Credential* credential = new Credential(OAuthClientInfo("CLIENT_ID", OAuthMode::User), this); // Change the CLIENT_ID to your string, example "XYZ123"
   
        Portal* portal = new Portal(credential, this);
   

Add the secured traffic layer

The ArcGIS World Traffic service, is a dynamic map service that presents historical and near real-time traffic information for different regions of the world. This service requires an ArcGIS Online organizational subscription. You will add a portal item referencing this service, and create a traffic layer from that.

1. Create a PortalItem using the traffic service's item ID. Then create an ArcGISMapImageLayer to display the traffic service. Finally, append the traffic layer to the map's collection of data layers (operational layers).

   Display_a_map.cpp

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       // Create a credential for this app and set the authentication mode.
        Credential* credential = new Credential(OAuthClientInfo("CLIENT_ID", OAuthMode::User), this); // Change the CLIENT_ID to your string, example "XYZ123"
   
        Portal* portal = new Portal(credential, this);
   
        // Create a layer to display the ArcGIS World Traffic service.
        // traffic layer https://www.arcgis.com/home/item.html?id=ff11eb5b930b4fabba15c47feb130de4
        PortalItem* item = new PortalItem(portal, "ff11eb5b930b4fabba15c47feb130de4", this);
        ArcGISMapImageLayer* imageLayer = new ArcGISMapImageLayer(item, this);
        // Append the traffic layer to the map's data layer collection.
        m_map->operationalLayers()->append(imageLayer);
   

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2. Press <Ctrl+R> to run the app.

You should briefly see a map with the topographic basemap layer centered on the Santa Monica Mountains in California. The AuthenticationView will then prompt you with an OAuth login page to enter your ArcGIS Online username and password. After authenticating successfully with ArcGIS Online, the map will appear with the traffic layer also displayed.

Other tutorials

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