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In OAuth, the client requests access to resources controlled by the resource owner and hosted by the resource server. OAuth addresses these issues by introducing an authorization layer and separating the role of the client from that of the resource owner.

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Compromise of any third-party application results in compromise of the end-user’s password and all the data protected by that password.Resource owners cannot revoke access to an individual third party without revoking access to all third parties, and must do so by changing the password.Third-party applications gain overly broad access to the resource owner’s protected resources, leaving resource owners without any ability to restrict duration or access to a limited subset of resources.Servers are required to support password authentication, despite the security weaknesses inherent in passwords.Third-party applications may store the resource owner’s credentials for future use, potentially as clear text or with poor encryption.This creates several problems and limitations such as: Third-party application access in client-server model To provide third-party applications with access to restricted resources, the resource owner shares its credentials with the third party. In the traditional client-server authentication model, the client requests an access-restricted resource (protected resource) on the server by authenticating with the server using the resource owner’s credentials (basic authentication).

In a real use case where you need to connect to the workflow service, there is a dedicated API for this. Note: Here, the workflow service’s REST API is used only for demonstration. The SM59 destination shall be configured for using OAuth with client credentials or SAML Bearer flow, as desired. This is used to get details of the workflow definitions in the subaccount on SAP Business Technology Platform. We create a simple runnable ABAP class consuming an SM59 destination pointing to the REST API offered by the workflow service for cloud foundry. The blog only focuses on the client credentials and SAML Bearer Assertion grant types.

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In this blog, I present an introduction to OAuth and explain how to implement and configure the consumption of an OAuth-enabled service provided by the SAP Business Technology Platform from an SAP S/4HANA system on release 2021 or above (here workflow service on cloud foundry is used as an example) using the CL_HTTP_CLIENT class and SM59 destination.

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