Salesforce SOAP SessionId as REST token

Question

I'm logging my users in using SOAP in my app. But then I want to use Analytics API, which is REST. But I don't want them to enter their credentials all over again.
Is there a way that I can use my already obtained SOAP sessionId as the token for REST API? When I tried to do that, I got an authentication error back from the REST call. Did I miss something or is it just not possible?

Answer 1

Yes, you can use the SOAP session ID in the same way you would use an access token you would have gotten via OAuth, by adding a Authorization: Bearer {sessionId} HTTP header to REST API requests.

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