(Visual FoxPro) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loCert
LOCAL lnSuccess
LOCAL loPrivKey
LOCAL loJwt
LOCAL loJose
LOCAL lcMyClientId
LOCAL loClaims
LOCAL loCrypt
LOCAL lnCurDateTime
LOCAL lcJwt_token
LOCAL loHttp
LOCAL loResp
LOCAL loJson
LOCAL lcTokenEndpoint
LOCAL loGrantTypes
LOCAL lnClientCredentialsIdx
LOCAL loReq
LOCAL lcAccessToken
LOCAL loSbResponse

* 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...

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
loCert.VerboseLogging = 1
* 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.
lnSuccess = loCert.LoadPfxFile("qa_data/pfx/UniCert_Norge_Test_secret.pfx","secret")
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loCert
    CANCEL
ENDIF

loPrivKey = loCert.ExportPrivateKey()
IF (loCert.LastMethodSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loCert
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Jwt')
loJwt = CreateObject('Chilkat.Jwt')

* Build the JOSE header
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJose = CreateObject('Chilkat.JsonObject')
* Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
lnSuccess = loJose.AppendString("alg","RS256")
lnSuccess = loJose.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.
lcMyClientId = "99999999-aaaa-bbbb-cccc-ddddeeeeffff"

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loClaims = CreateObject('Chilkat.JsonObject')
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
loCrypt = CreateObject('Chilkat.Crypt2')
loClaims.AppendString("jti",loCrypt.GenerateUuid())
loClaims.AppendString("sub",lcMyClientId)

* Set the timestamp of when the JWT was created to now minus 60 seconds
lnCurDateTime = loJwt.GenNumericDate(-60)
lnSuccess = loClaims.AddIntAt(-1,"iat",lnCurDateTime)

* Set the "not process before" timestamp to now minus 60 seconds
lnSuccess = loClaims.AddIntAt(-1,"nbf",lnCurDateTime)

* Set the timestamp defining an expiration time (end time) for the token
* to be now + 1 hour (3600 seconds)
lnSuccess = loClaims.AddIntAt(-1,"exp",lnCurDateTime + 3600)

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

* Produce the smallest possible JWT:
loJwt.AutoCompact = 1

* Create the JWT token.  This is where the RSA signature is created.
lcJwt_token = loJwt.CreateJwtPk(loJose.Emit(),loClaims.Emit(),loPrivKey)

? lcJwt_token

* Step 2 ------------------------------------------------------------------------------------------
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = CreateObject('Chilkat.Http')

* Fetch the discovery document...
loResp = loHttp.QuickRequest("GET","https://test-login.unieconomy.no/.well-known/openid-configuration")
IF (loHttp.LastMethodSuccess <> 1) THEN
    ? loHttp.LastErrorText
    RELEASE loCert
    RELEASE loJwt
    RELEASE loJose
    RELEASE loClaims
    RELEASE loCrypt
    RELEASE loHttp
    CANCEL
ENDIF

IF (loResp.StatusCode <> 200) THEN
    ? "Received response status code " + STR(loResp.StatusCode)
    ? "Response body containing error text or JSON:"
    ? loResp.BodyStr
    RELEASE loResp
    RELEASE loCert
    RELEASE loJwt
    RELEASE loJose
    RELEASE loClaims
    RELEASE loCrypt
    RELEASE loHttp
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
lnSuccess = loJson.Load(loResp.BodyStr)
RELEASE loResp

loJson.EmitCompact = 0
? loJson.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.

lcTokenEndpoint = loJson.StringOf("token_endpoint")

loGrantTypes = loJson.ArrayOf("grant_types_supported")
lnClientCredentialsIdx = loGrantTypes.FindString("client_credentials",1)
RELEASE loGrantTypes

* If clientCredentialsIdx is less then zero (-1) then the "client_credentials" string was not found.
IF (lnClientCredentialsIdx < 0) THEN
    ? "The client credentials grant type is not supported."
    RELEASE loCert
    RELEASE loJwt
    RELEASE loJose
    RELEASE loClaims
    RELEASE loCrypt
    RELEASE loHttp
    RELEASE loJson
    CANCEL
ENDIF

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.HttpRequest')
loReq = CreateObject('Chilkat.HttpRequest')
loReq.HttpVerb = "POST"
loReq.AddParam("client_id",lcMyClientId)
loReq.AddParam("scope","AppFramework.Sales")
loReq.AddParam("grant_type","client_credentials")
loReq.AddParam("client_assertion_type","urn:ietf:params:oauth:client-assertion-type:jwt-bearer")
loReq.AddParam("client_assertion",lcJwt_token)

loResp = loHttp.PostUrlEncoded(lcTokenEndpoint,loReq)
IF (loHttp.LastMethodSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loCert
    RELEASE loJwt
    RELEASE loJose
    RELEASE loClaims
    RELEASE loCrypt
    RELEASE loHttp
    RELEASE loJson
    RELEASE loReq
    CANCEL
ENDIF

* Make sure we got a 200 response status code, otherwise it's an error.
IF (loResp.StatusCode <> 200) THEN
    ? "POST to token endpoint failed."
    ? "Received response status code " + STR(loResp.StatusCode)
    ? "Response body containing error text or JSON:"
    ? loResp.BodyStr
    RELEASE loResp
    RELEASE loCert
    RELEASE loJwt
    RELEASE loJose
    RELEASE loClaims
    RELEASE loCrypt
    RELEASE loHttp
    RELEASE loJson
    RELEASE loReq
    CANCEL
ENDIF

lnSuccess = loJson.Load(loResp.BodyStr)
RELEASE loResp

? loJson.Emit()

* The JSON response will look like this:

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

* Get the access token:
lcAccessToken = loJson.StringOf("access_token")
? "accessToken = " + lcAccessToken

* ------------------------------------------------------
* 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.
loHttp.AuthToken = lcAccessToken

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbResponse = CreateObject('Chilkat.StringBuilder')
lnSuccess = loHttp.QuickGetSb("https://test.unieconomy.no/api/init/companies",loSbResponse)
IF (lnSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loCert
    RELEASE loJwt
    RELEASE loJose
    RELEASE loClaims
    RELEASE loCrypt
    RELEASE loHttp
    RELEASE loJson
    RELEASE loReq
    RELEASE loSbResponse
    CANCEL
ENDIF

* Examine the response status code.
IF (loHttp.LastStatus <> 200) THEN
    ? loSbResponse.GetAsString()
    ? "response status: " + STR(loHttp.LastStatus)
    ? "Received error response."
    RELEASE loCert
    RELEASE loJwt
    RELEASE loJose
    RELEASE loClaims
    RELEASE loCrypt
    RELEASE loHttp
    RELEASE loJson
    RELEASE loReq
    RELEASE loSbResponse
    CANCEL
ENDIF

loJson.LoadSb(loSbResponse)
? loJson.Emit()

? "Success."

RELEASE loCert
RELEASE loJwt
RELEASE loJose
RELEASE loClaims
RELEASE loCrypt
RELEASE loHttp
RELEASE loJson
RELEASE loReq
RELEASE loSbResponse