Simplified OAuth Config for Oracle Integration Cloud REST API using Postman !!!

This blog will be discussing very specific use case requirement which is more developer oriented and providing a quicker and efficient solution to invoke Oracle Integration REST API using OAuth access_token for testing purpose.

As an integration developer time to time you need to invoke Oracle Integration REST API to test API functionality. All the REST API in OIC needs a header parameter called “Authorization” which must needs to hold a valid access_token value in this format “Bearer access_token“.

In above format, “Bearer” is static world, However, access_token is the token value which we get after successfully OAuth Authentication from Oracle Identity Cloud Service.  Getting access_token from IDCS using code credentials flow is multi steps and cumbersome process.

However, developer can leverage Postman environment and variable features to simplify the process of getting access_token. That’s what, I will be covering in this blog.

Before I proceed further, I must redirect you to read my colleague blog which has greater in-depth explanation about what is IDCS, how IDCS govern security aspect of all Oracle PaaS products such as Oracle Integration Cloud, Analytics Cloud, Digital Assistant and so on and OAuth client and token generation process etc. I am recommending you to read his blog because I will be using few artefacts e.g. IDCS URL, Client ID, Client Secret etc which we need to get from IDCS OAuth Client Application as per the process given in his blog.

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Calling OCI APIs from Postman

Oracle’s Cloud Infrastructure has been designed in an API-first manner, which is awesome for all sorts of infrastructure automation tasks. It also implements an interesting API security model, in which all requests must be signed using a private key, associated with a public key which has already been configured in OCI (here, the developers are showing their infrastructure roots, as this echoes how SSH Auth is normally handled). The documentation of this model provides sample code in a number of languages, which is perfect if you are writing automation scripts, but is a little inflexible for ad-hoc testing. Typically I much prefer to use a rich graphical REST client, such a Postman, so that I can easily tweak my parameters and try out different types of calls before I write any code. Unfortunately while Postman is well equipped for Basic and Token based Auth, HTTP-Signature is not natively implemented, and rather than abandon Postman for a new tool, I set out to implement it using Postman’s powerful scripting capabilities. In this blog post I provide the result of this, which is a downloadable collection which provides all of the required scripts, and discuss the approach used.

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