(Go) Azure REST API Access Token

Demonstrates how to request an Azure REST API OAUTH2 access token.

Note: In order to access resources a Service Principal needs to be created in your Tenant. It is really convenient to do it via AZ CLI:

az ad sp create-for-rbac --name [APP_NAME] --password [CLIENT_SECRET]

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    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    rest := chilkat.NewRest()

    // URL: https://login.microsoftonline.com/TENANT_ID/oauth2/token
    bTls := true
    port := 443
    bAutoReconnect := true
    success := rest.Connect("login.microsoftonline.com",port,bTls,bAutoReconnect)
    if success != true {
        fmt.Println("ConnectFailReason: ", rest.ConnectFailReason())
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        return
    }

    // Add query params to the request.
    rest.AddQueryParam("grant_type","client_credentials")
    rest.AddQueryParam("client_id","APP_ID")
    rest.AddQueryParam("client_secret","CLIENT_SECRET")
    rest.AddQueryParam("resource","https://management.azure.com/")

    strResponseBody := rest.FullRequestFormUrlEncoded("POST","/TENANT_ID/oauth2/token")
    if rest.LastMethodSuccess() != true {
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        return
    }

    respStatusCode := rest.ResponseStatusCode()
    if respStatusCode >= 400 {
        fmt.Println("Response Status Code = ", respStatusCode)
        fmt.Println("Response Header:")
        fmt.Println(rest.ResponseHeader())
        fmt.Println("Response Body:")
        fmt.Println(*strResponseBody)
        rest.DisposeRest()
        return
    }

    json := chilkat.NewJsonObject()
    json.Load(*strResponseBody)
    json.SetEmitCompact(false)
    fmt.Println(*json.Emit())

    // The result is an access token such as the following:

    // {
    //   "token_type": "Bearer",
    //   "expires_in": "3600",
    //   "ext_expires_in": "3600",
    //   "expires_on": "1557864616",
    //   "not_before": "1557860716",
    //   "resource": "https://management.azure.com/",
    //   "access_token": "eyJ0eXAiOiJKV1QiL ... 20UFDDOHEyUg"
    // }

    // We'll save this JSON to a file for other examples to use..
    json.WriteFile("qa_data/tokens/azureToken.json")

    rest.DisposeRest()
    json.DisposeJsonObject()