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· Jul 5

OnInit() Question - Ens.BusinessOperation (HTTP.OutboundAdapter)

#Authentication #Business Operation #Key Question #REST API #Health Connect #HealthShare #InterSystems IRIS #InterSystems IRIS for Health

I have a question about using OnInit() within a Ens.BusinessOperation.

When you include OnInit(), does OnInit() only execute when you start a Business Operation? Or does it execute OnInit () every time you send a REST request to the operation. I am trying to pinpoint when the best time is to execute the POST command to get the Token

I am needing to get a Bearer Token from a REST POST call and return the Authorization key prior to making the rest of the REST calls to pull down data.

When not using OAuth, what have you done to get the Token prior to executing any Requests?

Thanks

Scott

$ZV: IRIS for UNIX (Red Hat Enterprise Linux 8 for x86-64) 2024.1 (Build 267_2U) Tue Apr 30 2024 16:06:39 EDT [HealthConnect:3.5.0-1.m1]
Discussion (13)1
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Ashok Kumar · Jul 5

Hello @Scott Roth 

The OnInit Method executed once start/restart a Business Operation. Maybe You can create additional HTTP Business operation and call this operation based on the create/renewal for OAuth token.  Eventually you can call that operation as sendrequestsync and get the token in your actual business operation. Please share if any additional thoughts about this flow.

Thanks!

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Scott Roth · Jul 5

This is all relatively new to me, so please bear with me. Since I am getting a Token it's not the same as OAuth, correct? Nothing in the Vendors documentation says that it is OAuth, it just says..."Authentication method is a token-based approach".

So, if that is the case, I can't use the %SYS.OAuth2.AccessToken methods to verify IsAuthorized, and GetAccessTokenClient correct?

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Marc Mundt · Jul 5

Good question. In OAuth the response will include the expiration time, so that's what I was expecting here.

If the response doesn't include an expiration time does the vendor's documentation say anything about if tokens can be used for more than 1 request and if so how long it's valid for? If you know it's supposed to be valid for 60 minutes then you could just log the time when you requested the token and use that to track it.

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Samantha Forish · Jul 8

What we have typically built into our code is that the OnInit() will just call a separate ..GetAuthorizationToken method where the authorization code is stored.

Then in our GET methods (or whatever API endpoint you are consuming), if we receive a '401 Unauthorized' HTTP Status Response, at that point we will call out to the ..GetAuthorizationToken method. We will get a fresh token, and then continue down the GET method.

There is no need to get a fresh token every time. If we are getting 200 OK responses back, the token must be valid. It should be that when you get a 401 status response, you can capture that into an "if" statement and just call out to your GetAuthorizationToken method at that point.

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Samantha Forish · Jul 10

Yes, we built GetAuthorizationToken method ourselves so you can compose the request however you need.

Basically, in order to get your token, you are just making another REST request to their authorization endpoint.

Example:

Method GetAuthorizationToken() As %Status
{
//Authenticate with System
    set tHttpResponse=##class(%Net.HttpResponse).%New()
    set tHttpRequest = ##class(%Net.HttpRequest).%New()
    set tHttpRequest.ContentType="application/x-www-form-urlencoded"
    
    //Get username and pwd out of Credential store
    set objCred = ##class(Ens.Config.Credentials).%OpenId(..Adapter.Credentials)
//Insert the username and pwd (in your case may be "email" instead of "username")
    do tHttpRequest.InsertFormData("username",objCred.Username)
    do tHttpRequest.InsertFormData("password",objCred.Password)
    //add any other things the request may need
    
    //send auth request
    set tURL=..AuthURL
    set tSC = ..Adapter.SendFormDataArray(.tHttpResponse,"POST",tHttpRequest,"","",tURL)
    
    //Get response, were our credentials accepted?
    set tStatusCode = tHttpResponse.StatusCode
    $$$TRACE("Authorization Status Code [" _ tStatusCode _ "]")
    if tStatusCode = 200 {
        set ..tToken=tHttpResponse.access_token
        Return $$$OK
    } else {
    Quit $$$ERROR("5001", "tStatusCode - can't auth with System")
        }
    }
}
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