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Recently most of the customers are moving from BASIC authentication to OAuth2.0 or they are planning to do so. In this blog, I will discuss three probable scenarios which any SAP Cloud Integration consultant may encounter.



             



Scope: Applicable for SAP Cloud Integration Consultants

Scenario1: Accessing and CPI service through OAuth2.0 (Simulation through POSTMAN).

Scenario2: Consuming SuccessFactors APIs through OAuth2.0 using HTTP and OData adapters.

Scenario3: Consuming SuccessFactors APIs through OAuth2.0 using SuccessFactors (SF) adapters.

 

Steps to achieve Scenario1:Accessing and CPI service through OAuth2.0 (Simulation through POSTMAN)

  • Setup an instance to get service key - copy clientid, clientsecret and tokenurl.


         




  • Fetch Bearer key using POSTMAN


         



 

       





  • Accessing the service using Bearer key





Steps to achieve Scenario2:Consuming SuccessFactors APIs through OAuth2.0 using HTTP and OData adapters

  • Assign required authorization to the user in SF.


Manage Integration Tools > Manage OAuth2 Client Applications - to be done           by SF consultant. The user should have permission to access APIs. 

  • Configurations in SF for OAuth - Manage OAuth2 Client Applications


     


The download certificate will have two section (private key and certificate). Copy the  private key (between ---BEGIN ENCRYPTED to ---END ENCRYPTED).

Click on Register. An API Key will be generated. Copy the key as this needs to be required in the subsequent steps below.

 


  • Design CPI Scenario - Accessing the APIs using HTTP & OData adapters.



                 



Pass below details in Body - client_id, user_id, token_url & private_key

client_id=<client_id>&user_id=<user_created in_SF>&token_url=<SFInstance>/outh/token&private_key=<private_key>

 


               



company_id=<Comp_Id>&client_id=<Client_Id>&grant_type=urn:ietf:params:oauth:grant-type:saml2-bearer&assertion=${in.body}




 
import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;
import groovy.json.*;

def Message LogSamlAss(Message message) {

def body = message.getBody(java.lang.String) as String;
def messageLog = messageLogFactory.getMessageLog(message);
messageLog.addAttachmentAsString("Log_SAML_Assertion:", body, "text/xml");
return message;
}



def Message HoldToken(Message message) {
//Body
def body = message.getBody(String.class);
def jsonSlurper = new JsonSlurper()
def list = jsonSlurper.parseText(body)
def token="Bearer "+list.access_token.toString();
//Headers
def map = message.getHeaders();
message.setHeader("Authorization", token);

def messageLog = messageLogFactory.getMessageLog(message);
messageLog.addAttachmentAsString("Log_Token:", body, "text/xml");

return message;
}


 



Steps to achieve Scenario3: Consuming SuccessFactors APIs through OAuth2.0 using SuccessFactors adapters

  • Assign required authorization to the user in SF – Follow Scenario2.

  • Generating key pair in CPI.






  • OAuth Configuration in SF.



Copy the API Key generated. This needs to be passed in CPI while creating a user credentials to access SF through OAuth.

  • Create a user in CPI with SAML assertion – later this user to be passed in SF adapter configuration for accessing SF APIs through OAuth2.0





  • Design CPI Scenario - Accessing the APIs using SuccessFactors adapter.





We have seen 03 probable scenarios for accessing an API through OAuth2.0.

Any question or feedback will be appreciated!
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