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Test CAP Service and its Destination

Beginner
10 min.
SAP Build, Beginner, SAP Cloud Application Programming Model, Tutorial, SAP Business Application Studio, SAP Business Technology Platform, SAP Build Apps
Test the CAP service created with SAP Business Application Studio's productivity tools, including the destination automatically generated to expose it to SAP Build.
You will learn
  • How to find and test the destination automatically created when you deployed your CAP service
thecodesterDaniel WroblewskiOctober 25, 2023
Created by
thecodester
August 22, 2023
Contributors
thecodester

Prerequisites

In order for SAP Build Apps to access your CAP service, a destination for the service is required. The destination was automatically created when you deployed the service with Enable Discovery.

In this tutorial we will test the destination using the credentials of the current user. We want to log into the service this way because we have defined roles, which can be assigned to specific users. So we need to know the current user.

  • Step 1

    Open your SAP BTP cockpit and navigate to the Cloud Foundry space where your service is deployed.

    Open service

    Click on the service, and then click on Service Bindings. Here you will RiskManagement-uaa

    Alt text

    Finally, click on RiskManagement-uaa, and you will see a service key on the right, for which you can click View to get all the information that was used to build the destination.

    Service key

    You won’t need this information now, but if you make certain changes to the destination, you may need to provide the client secret, which is found in this file.

  • Step 2

    1. Navigate back to your subaccount (trial if you are in your trial account).

    2. Go to Connectivity > Destinations.

    3. Select the destination RiskManagement-RiskManagementService.

      Destinations

      At the bottom of the page you will see all of the settings for this destination.

      Notice the additional properties that make it available to SAP Build Apps and SAP Build Process Automation.

      Field Value
      Appgyver.Enabled true
      WebIDEEnabled true
      HTML5.DynamicDestination true
      sap.processautomation.enabled true
      sap.applicationdevelopment.actions.enabled true

      And notice that the authentication type is OAuth2UserTokenExchange, which enables the service to know what user is calling it. Most of the other settings for authentication come from the service key.

  • Step 3

    1. In the cockpit, go to Security > Users.

    2. Find your user for the custom IDP, and on the right, click Assign Role Collection.

    3. Search for risk, select both roles you created with your service, and click Assign Role Collection.

      Assign roles

    Why do we need to create a destination for the CAP service?

  • Step 4

    1. Go back to SAP Business Application Studio.

      It must be the BAS located on the same subaccount as your service and SAP Build Apps.

    2. Open a terminal window.

      Either go to hamburger menu Terminal > New Terminal or View > Terminal.

      Terminal

    3. In the terminal, run the following commands separately:

      Bash
      Copy
      curl http://localhost:8887/reload
      Bash
      Copy
      curl https://RiskManagement-RiskManagementService.dest/Risks
      Run curl

      You should get the service document of the service.

      Service document

      IMPORTANT: If for some reason you do not get a response from terminal, continue on with the rest of the tutorial.

    4. If you remove the roles from your user, immediately you will see that you get a 403 error.

      403 error

    Why does the destination need OAuth2UserTokenExchange authentication?

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