(VB.NET UWP/WinRT) Uni Economy API Client Credentials Flow

Demonstrates how to do OAuth 2.0 using the client credentials flow for the Uni Economy API. (This means that the server can authenticate against the identity server without human interaction.)

For more information, see https://developer.unieconomy.no/wiki/introduction/getting-started/server-application

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

' Step 1 ------------------------------------------------------------------------------------------
' First create a client token...

Dim cert As New Chilkat.Cert
cert.VerboseLogging = True
' Note: .pfx and .p12 files are identical.  The only difference is the file extension.
' Also, if your .p12 password is longer than 64 chars, you'll need Chilkat v9.5.0.83 or later.
' To shorten the password, import your .p12 onto your Windows computer by double-clicking on the .p12 file,
' make sure when importing that keys are exportable, then re-export with private keys to a .pfx with a new password.
Dim success As Boolean = cert.LoadPfxFile("qa_data/pfx/UniCert_Norge_Test_secret.pfx","secret")
If (success = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim privKey As Chilkat.PrivateKey = cert.ExportPrivateKey()
If (cert.LastMethodSuccess = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim jwt As New Chilkat.Jwt

' Build the JOSE header
Dim jose As New Chilkat.JsonObject
' Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
success = jose.AppendString("alg","RS256")
success = jose.AppendString("typ","JWT")

' Now build the JWT claims (also known as the payload)

' Our JWT claims will contain members as shown here:
' {
'   "jti": "ad612fce-3e71-4f6a-8af1-7eb0414b4eea",  <-- generated unique global identifier
'   "sub": "99999999-aaaa-bbbb-cccc-ddddeeeeffff",  <-- This is the clientId
'   "iat": 1588102982,  <-- These are date/time values.
'   "nbf": 1588102982,
'   "exp": 1588103042,
'   "iss": " 99999999-aaaa-bbbb-cccc-ddddeeeeffff",
'   "aud": "https://test-login.unieconomy.no/connect/token"
' }

' Use your own client ID.
Dim myClientId As String = "99999999-aaaa-bbbb-cccc-ddddeeeeffff"

Dim claims As New Chilkat.JsonObject
Dim crypt As New Chilkat.Crypt2
claims.AppendString("jti",crypt.GenerateUuid())
claims.AppendString("sub",myClientId)

' Set the timestamp of when the JWT was created to now minus 60 seconds
Dim curDateTime As Integer = jwt.GenNumericDate(-60)
success = claims.AddIntAt(-1,"iat",curDateTime)

' Set the "not process before" timestamp to now minus 60 seconds
success = claims.AddIntAt(-1,"nbf",curDateTime)

' Set the timestamp defining an expiration time (end time) for the token
' to be now + 1 hour (3600 seconds)
success = claims.AddIntAt(-1,"exp",curDateTime + 3600)

claims.AppendString("iss",myClientId)
claims.AppendString("aud","https://test-login.unieconomy.no/connect/token")


' Produce the smallest possible JWT:
jwt.AutoCompact = True

' Create the JWT token.  This is where the RSA signature is created.
Dim jwt_token As String = jwt.CreateJwtPk(jose.Emit(),claims.Emit(),privKey)

Debug.WriteLine(jwt_token)

' Step 2 ------------------------------------------------------------------------------------------
Dim http As New Chilkat.Http

' Fetch the discovery document...
Dim resp As Chilkat.HttpResponse = Await http.QuickRequestAsync("GET","https://test-login.unieconomy.no/.well-known/openid-configuration")
If (http.LastMethodSuccess <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


If (resp.StatusCode <> 200) Then
    Debug.WriteLine("Received response status code " & resp.StatusCode)
    Debug.WriteLine("Response body containing error text or JSON:")
    Debug.WriteLine(resp.BodyStr)

    Exit Sub
End If


Dim json As New Chilkat.JsonObject
success = json.Load(resp.BodyStr)


json.EmitCompact = False
Debug.WriteLine(json.Emit())

' We have the discovery document, which contains something like this:

' You can use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON

' {
'   "issuer": "https://test-login.unieconomy.no",
'   "jwks_uri": "https://test-login.unieconomy.no/.well-known/openid-configuration/jwks",
'   "authorization_endpoint": "https://test-login.unieconomy.no/connect/authorize",
'   "token_endpoint": "https://test-login.unieconomy.no/connect/token",
'   "userinfo_endpoint": "https://test-login.unieconomy.no/connect/userinfo",
'   "end_session_endpoint": "https://test-login.unieconomy.no/connect/endsession",
'   "check_session_iframe": "https://test-login.unieconomy.no/connect/checksession",
'   "revocation_endpoint": "https://test-login.unieconomy.no/connect/revocation",
'   "introspection_endpoint": "https://test-login.unieconomy.no/connect/introspect",
'   "device_authorization_endpoint": "https://test-login.unieconomy.no/connect/deviceauthorization",
'   "frontchannel_logout_supported": true,
'   "frontchannel_logout_session_supported": true,
'   "backchannel_logout_supported": true,
'   "backchannel_logout_session_supported": true,
'   "scopes_supported": [
'     "openid",
'     "profile",
'     "email",
'     "offline_access",
'     "AppFramework.All",
'     "AppFramework",
'     "AppFramework.Sales",
'     "IdentityAPI",
'     "widgetApi",
'     "TestScope.test",
'     "TestScope.Cars",
'     "HaglandAPI",
'     "LicenseAdmin",
'     "LicenseAdmin.Product.Read",
'     "SoftRig.Product.Write",
'     "TestAPI.test",
'     "offline_access"
'   ],
'   "claims_supported": [
'     "sub",
'     "updated_at",
'     "name",
'     "family_name",
'     "given_name",
'     "middle_name",
'     "nickname",
'     "preferred_username",
'     "picture",
'     "website",
'     "gender",
'     "birthdate",
'     "zoneinfo",
'     "locale",
'     "profile",
'     "email",
'     "email_verified"
'   ],
'   "grant_types_supported": [
'     "authorization_code",
'     "client_credentials",
'     "refresh_token",
'     "implicit",
'     "password",
'     "urn:ietf:params:oauth:grant-type:device_code",
'     "delegation"
'   ],
'   "response_types_supported": [
'     "code",
'     "token",
'     "id_token",
'     "id_token token",
'     "code id_token",
'     "code token",
'     "code id_token token"
'   ],
'   "response_modes_supported": [
'     "form_post",
'     "query",
'     "fragment"
'   ],
'   "token_endpoint_auth_methods_supported": [
'     "client_secret_basic",
'     "client_secret_post",
'     "private_key_jwt",
'     "private_key_jwt"
'   ],
'   "id_token_signing_alg_values_supported": [
'     "RS256"
'   ],
'   "subject_types_supported": [
'     "public"
'   ],
'   "code_challenge_methods_supported": [
'     "plain",
'     "S256"
'   ],
'   "request_parameter_supported": true
' }

' ------------------------------------------------------
' The next steps are to (1) get the token_endpoint,
' and (2) verify that the client_credentials grant type is supported.

Dim tokenEndpoint As String = json.StringOf("token_endpoint")

Dim grantTypes As Chilkat.JsonArray = json.ArrayOf("grant_types_supported")
Dim clientCredentialsIdx As Integer = grantTypes.FindString("client_credentials",True)


' If clientCredentialsIdx is less then zero (-1) then the "client_credentials" string was not found.
If (clientCredentialsIdx < 0) Then
    Debug.WriteLine("The client credentials grant type is not supported.")
    Exit Sub
End If


' ------------------------------------------------------
' Request the access token using our Client ID and JWT

Dim req As New Chilkat.HttpRequest
req.HttpVerb = "POST"
req.AddParam("client_id",myClientId)
req.AddParam("scope","AppFramework.Sales")
req.AddParam("grant_type","client_credentials")
req.AddParam("client_assertion_type","urn:ietf:params:oauth:client-assertion-type:jwt-bearer")
req.AddParam("client_assertion",jwt_token)

resp = Await http.PostUrlEncodedAsync(tokenEndpoint,req)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Make sure we got a 200 response status code, otherwise it's an error.
If (resp.StatusCode <> 200) Then
    Debug.WriteLine("POST to token endpoint failed.")
    Debug.WriteLine("Received response status code " & resp.StatusCode)
    Debug.WriteLine("Response body containing error text or JSON:")
    Debug.WriteLine(resp.BodyStr)

    Exit Sub
End If


success = json.Load(resp.BodyStr)


Debug.WriteLine(json.Emit())

' The JSON response will look like this:

' {
'   "access_token": "...",
'   "expires_in": 3600,
'   "token_type": "Bearer",
'   "scope": "AppFramework.Sales"
' }



' Get the access token:
Dim accessToken As String = json.StringOf("access_token")
Debug.WriteLine("accessToken = " & accessToken)

' ------------------------------------------------------
' Use the access token in a request.
' We'll just send a GET request to  https://test.unieconomy.no/api/init/companies

' Tell the http object to use the OAuth2 access token in the "Authorization: Bearer ..." header.
http.AuthToken = accessToken

Dim sbResponse As New Chilkat.StringBuilder
success = Await http.QuickGetSbAsync("https://test.unieconomy.no/api/init/companies",sbResponse)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Examine the response status code.
If (http.LastStatus <> 200) Then
    Debug.WriteLine(sbResponse.GetAsString())
    Debug.WriteLine("response status: " & http.LastStatus)
    Debug.WriteLine("Received error response.")
    Exit Sub
End If


json.LoadSb(sbResponse)
Debug.WriteLine(json.Emit())

Debug.WriteLine("Success.")