(Xojo Plugin) RSAP Union API - Get OAuth2 Access Token

Demonstrates how to get an OAuth2 access token for the RSAP Union API. Note: This uses the client credentials flow, which does NOT require an interactive engagement using a browser.

For more information, see https://app.swaggerhub.com/apis-docs/pderas/RSAP/2.0.1#/Authentication/getOauthToken

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

Dim http As New Chilkat.Http
Dim success As Boolean

// The following JSON is sent in the request body.

// {
//   "grant_type": "client_credentials",
//   "client_id": 1234,
//   "client_secret": "23456abcde"
// }

Dim json As New Chilkat.JsonObject
success = json.UpdateString("grant_type","client_credentials")
success = json.UpdateInt("client_id",1234)
success = json.UpdateString("client_secret","23456abcde")

http.SetRequestHeader "Content-type","application/json"

// Add the client certificate TLS authentication.
Dim cert As New Chilkat.Cert
success = cert.LoadFromFile("qa_data/certs_and_keys/union_client_certificate.crt")
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadAnyFormatFile("qa_data/certs_and_keys/union_client_certificate.nopass.key","")
If (success = False) Then
    System.DebugLog(privKey.LastErrorText)
    Return
End If

// Associate the private key with the cert.
// This will fail if the private key is not actually the correct one that corresponds to the public key stored within the cert.
success = cert.SetPrivateKey(privKey)
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

// Tell HTTP to use the cert for client TLS certificate authentication.
success = http.SetSslClientCert(cert)
If (success = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

Dim resp As Chilkat.HttpResponse
resp = http.PostJson3("https://api-test.rsap.ca/oauth/token","application/json",json)
If (http.LastMethodSuccess = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

Dim sbResponseBody As New Chilkat.StringBuilder
success = resp.GetBodySb(sbResponseBody)
Dim jResp As New Chilkat.JsonObject
success = jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = False

System.DebugLog("Response Body:")
System.DebugLog(jResp.Emit())

Dim respStatusCode As Int32
respStatusCode = resp.StatusCode
System.DebugLog("Response Status Code = " + Str(respStatusCode))
If (respStatusCode >= 400) Then
    System.DebugLog("Response Header:")
    System.DebugLog(resp.Header)
    System.DebugLog("Failed.")

    Return
End If

// Sample JSON response:
// (Sample code for parsing the JSON response is shown below)

// {
//   "token_type": "Bearer",
//   "expires_in": 3600,
//   "access_token": "eyJ0eXAi...LnE"
// }

// This token expires in 1 hour.  Your application could re-use the same token for up to an hour,
// or it can simply get a new access token before each request (if you're not doing too many requests).
success = jResp.WriteFile("qa_data/tokens/rsapToken.json")