Import SAP OData metadata as an API

Import OData metadata

1. In the left menu, select APIs > + Add API.

2. Under Create from definition, select OData.

   

3. Enter API settings. You can update your settings later by going to the Settings tab of the API.

   1. In OData specification, enter a URL for an OData metadata endpoint, typically the URL to the service root, appended with /$metadata. Alternatively, select a local OData XML file to import.

   2. Enter remaining settings to configure your API. These settings are explained in the Import and publish your first API tutorial.

4. Select Create.

   The API is added to the APIs list. The entity sets and functions that are exposed in the OData metadata description appear on the API's Schema tab.

   

Update the OData schema

You can access an editor in the portal to view your API's OData schema. If the API changes, you can also update the schema in API Management from a file or an OData service endpoint.

1. In the portal, navigate to your API Management instance.

2. In the left menu, select APIs > your OData API.

3. On the Schema tab, select the edit (</>) icon.

4. Review the schema. If you want to update it, select Update from file or Update schema from endpoint.

   

Secure your OData API

Secure your OData API by applying both existing access control policies and an OData validation policy to protect against attacks through OData API requests.

Convert OData metadata to OpenAPI JSON

1. Convert the OData XML to OpenAPI JSON format. Use an OASIS open-source tool for OData v2 or OData v4, depending on your metadata XML.

   The following is an example command to convert OData v2 XML for the test service epm_ref_apps_prod_man_srv:

   odata-openapi -p --basePath '/sap/opu/odata/sap/epm_ref_apps_prod_man_srv' \
    --scheme https --host <your IP address>:<your SSL port> \
    ./epm_ref_apps_prod_man_srv.xml
   

   Note

   • For test purposes with a single XML file, you can use a web-based converter based on the open-source tool.
   • With the tool or the web-based converter, specifying the <IP address>:<port> of your SAP OData server is optional. Alternatively, add this information later in your generated OpenAPI specification or after importing to API Management.

2. Save the openapi-spec.json file locally for import to API Management.

Import and publish backend API

1. From the side navigation menu, under the APIs section, select APIs.

2. Under Create a new definition, select OpenAPI specification.

   

3. Click Select a file, and select the openapi-spec.json file that you saved locally in a previous step.

4. Enter API settings. You can set the values during creation or configure them later by going to the Settings tab.

   • In API URL suffix, we recommend using the same URL path as in the original SAP service.

   • For more information about API settings, see Import and publish your first API tutorial.

5. Select Create.

Complete API configuration

Add the following three operations to the API that you imported.

• GET /$metadata

  Operation	Description	Further configuration for operation
  GET /$metadata	Enables API Management to reach the $metadata endpoint, which is required for client integration with the OData server. This required operation isn't included in the OpenAPI specification that you generated and imported.	Add a 200 OK response.

  

• HEAD /

  Operation	Description	Further configuration for operation
  HEAD /	Enables the client to exchange Cross Site Request Forgery (CSRF) tokens with the SAP server, when required. SAP also allows CSRF token exchange using the GET verb. CSRF token exchange isn’t covered in this article. See an example API Management policy snippet to broker token exchange.	N/A

  

• GET /

  Operation	Description	Further configuration for operation
  GET /	Enables policy configuration at service root.	Configure the following inbound rewrite-uri policy to append a trailing slash to requests that are forwarded to service root: <rewrite-uri template="/" copy-unmatched-params="true" /> This policy removes potential ambiguity of requests with or without trailing slashes, which are treated differently by some backends.

  

Also, configure authentication to your backend using an appropriate method for your environment. For examples, see API Management authentication and authorization policies.

Test your API

1. Navigate to your API Management instance.

2. From the side navigation menu, under the APIs section, select APIs.

3. Under All APIs, select your imported API.

4. Select the Test tab to access the test console.

5. Select an operation, enter any required values, and select Send.

   For example, test the GET /$metadata call to verify connectivity to the SAP backend

6. View the response. To troubleshoot, trace the call.

7. When testing is complete, exit the test console.