Monday 7 September 2015

Windows 10 app with integrated Keycloak OAuth 2.0

Team Aerogear provides many useful libraries not only for Android, iOS and Cordova. They developed OAuth2.0 Nuget package for Windows Phone platform enabling user to easily authorized through Google, Facebook and even through Keycloak. On their github you can find Windows Phone 8.1 example application using this library to upload a captured photo on web application which displays these uploaded photos in slideshow. What I did was conversion of this example app to Windows 10 platform and analysis of cooperation with the latest version of Keycloak 1.4.0. After reading of several tutorials from various sources I decided to create one summarizing step by step tutorial which describes how to deploy this app on Windows 10 mobile emulator.

General requirements

Pre-requisites and settings

  1. Download Keycloak Demo Bundle (version 1.4.0 Final)
  2. Setup Keycloak to use SSL (original resource)
    1. Create Self Signed Certificate by command:
      2. keytool -genkey -alias localhost -keyalg RSA -keystore keycloak.jks -validity 10950
      (answer for the What is your first and last name? should be DNS name (IP adress) of PC with running server). PC and mobile should be connected to the same Wi-Fi network.
    2. Move generated keycloak.jks to keycloak-demo-1.4.0.Final/keycloak/standalone/configuration
    3. To security-realms in keycloak-demo-1.4.0.Final/keycloak/standalone/configuration/standalone.xml add: 
      <security-realm name="UndertowRealm">
    <server-identities>
        <ssl>
            <keystore path="keycloak.jks" relative-to="jboss.server.config.dir" 
 keystore-password="SELECTED_PASSWORD" />
        </ssl>
    </server-identities>
</security-realm>
    4. And to <server name="default-server"> element add:
<https-listener name="https" socket-binding="https" security-realm="UndertowRealm" />

Starting the server

  1. Start the server keycloak-demo-1.4.0.Final/keycloak/bin/standalone.bat -b 0.0.0.0
  2. Go to http://localhost:8080/auth/admin/index.html
  3. Login using admin / admin
  4. Click on Add realm and import this configuration file

Starting and setting the web application

  1. Download this project and get only the Shoot directory
  2. Add "auth-server-url": "/auth" to Shoot/src/main/webapp/WEB-INF/keycloak.json
  3. Build (mvn clean install)
  4. Open Shoot/target/shoot.war (with WinRAR for example) and add keycloak.cer there
  5. Go to http://localhost:9990/console/App.htmland navigate to Deployments and add shoot.war
    (if we deploy the .war by mvn wildfly:deploy, we would lost added certificate)

Installing certificate to Windows 10 emulator

  1. Open browser(Edge) and download the certificate by navigating to http://<IP>:8080/shoot/keycloak.cer where IP is the name of the certificate chosen earlier.
  2. Open and install the certificate

Preparing example app

Because this app was built for Windows Phone 8.1 platform, we need to convert the project to be executable on Windows 10, in other words the project has to target the Universal Windows Platform (UWP). There exists some scripts or nuget plugins which can do the conversion automatically, but finally there is more mess then before and you have to manually edit lot of stuffs in our case, so the most easiest way is to create new solution in VS15 for UWP and copy the source code into it.
  1. Download the source code of example app.
  2. Create new solution in VS15 and import the source code into it.
  3. Download the aerogear-windows-oauth2 project which is actually the source code of library available as Nuget package and import it to our solution
  4. Next you have to edit the MainPage.xaml.cs by configuring the IP adress to the same adress as the server is running on (it is assuring that it is going to run also on real device) and then add the line adding the scope to the configuration.
  5. Then in aerogear-windows-oauth2 project you should edit the class AccountManager.cs as below. That is because the manifest files of Windows Phone 8.1 and Windows 10 are different and the redirect protocol (org.aerogear.Shoot) is not that easy to parse from Windows 10 file.
  6. Build and run the solution on one of the Windows 10 emulators. The result is shown on screenshots below.

Application flow

  • You capture a photo (on emulator only this "tv noise"). Click on Keycloak icon, then you are redirected to login Keycloak page where you enter user / password (according to settings in realm). Finally we get feedback about succesfully uploaded image to our web application.
  • If we check the web application then, the image is visible there.

Conclusion

Library aerogear-windows-oauth2 was recently updated for Windows 10 as well so there is no need to manually edit the code in AccountManager and do other changes. It is good to say that this tutorial was focused mainly on Windows 10 mobile application, if we want to deal with desktop Windows 10 application, there has to be done some other additional changes such as adding the certificate directly to the "Trusted Publishers" and change of piece of code which does the authentication part.
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