It would have been simpler to use the built-in Postman OAuth authentication feature. This tutorial also shows off some of the functionality of Postman, from pre-request scripts, to tests, to setting and get environment data in order to pass between requests. (We could have also used the dialog Runtime API.) Request: This request is the basic SAP Conversational AI Runtime API for sending an utterance to the NLP. Get-oauth-credentials: This request takes our chatbot credentials and calls the OAuth service to retrieve a new OAuth token. If yes, we skip the request for getting a token. Start: This request is a dummy request, but let’s us at the start test whether we already have an OAuth token. In Postman, you will set up 3 requests, and put them in a collection so they can be run together and pass arguments to each other: It only exists as a workaround because Postman's team has been ignoring requests to let us use an idtoken instead of accesstoken since 2014. Here, you will use Postman to more simply show how to retrieve an OAuth token and then call the API. / This Postman pre-request script allows using an idtoken from an Amazon Cognito OAuth2 flow instead of the accesstoken. If you are using client_credentials, you can tweak the above script to get the code from the authUrl and then get the access_token from AuthTokenUrl.This tutorial is a companion to the tutorial Call SAP Conversational AI API Using OAuth, which was a more sophisticated setup for calling SAP Conversational AI APIs using a Python server. So these can be automated from the scripts. The other two types (client credentials & password credentials) doesn't require any browser interaction. But if the server provides refresh-token then the above script can help you get the access-token. By setting up an easy request to check if my currently stored access token from the environment variables is still valid, I'm able to handle the resetting of it completely behind the scenes. Two of them (Auth code & Implicit) requires interaction with the browser which can't be automated. Postman provides this awesome feature of performing any scripts before actually sending the actual configured request. Note: There are 4 types of Grant Types in Oauth2. Now when the request is being sent, the variable accessToken will be present, which you can use in your request like this: Or if you just want to use this in the current request and then discard it Next, create a new call which gets an access_token using the password grant_type. Side note: I've been using the Postman mac client, in case there is a different in clients I'm unaware of.įirst, setup these environment variables: This becomes more important with the more tests written in a collection which all use OAuth2 authorization. I would love to know if there is a solution to this which results in collections being able to be run with minimal effort put into authorization. I've taken my expectations down a notch in regards to the refresh token and thought I could simply run the authentication on the first test in the list, saving the access token somehow in a global or environment variable, and then using that token in the all subsequent tests, but I have not found a way to save the access token generated via the OAuth2 helper. However, I can't seem to figure out how to prompt the user either, the way the OAuth2 helper does. I've tried creating a few steps at the beginning of the collection to replicate the helper, but cannot get past the step where user interaction is required to approve/deny (which makes sense as it's a security risk otherwise). (I've suggested this feature be placed into the helper in the Postman Github Issues.) When using the OAuth2 authorization helper in Postman, I haven't discovered a method to save a returned refresh token, and thus use it when the access token expires to get a new one. Be able to run a collection without going through the authorization process of every call individually prior to running the collection.
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