B4X

RSAP Union API - Get OAuth2 Access Token

See more _Miscellaneous_ Examples

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. B4X

Dim success As Boolean = False

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

Dim http As ChilkatHttp
http.Initialize("http")

'  The following JSON is sent in the request body.

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

Dim json As ChilkatJsonObject
json.Initialize
json.UpdateString("grant_type", "client_credentials")
json.UpdateInt("client_id", 1234)
json.UpdateString("client_secret", "23456abcde")

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

'  Add the client certificate TLS authentication.
Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadFromFile("qa_data/certs_and_keys/union_client_certificate.crt")
If success = False Then
    Log(cert.LastErrorText)
    Return
End If


Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = privKey.LoadAnyFormatFile("qa_data/certs_and_keys/union_client_certificate.nopass.key", "")
If success = False Then
    Log(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
    Log(cert.LastErrorText)
    Return
End If


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


Dim resp As ChilkatHttpResponse
resp.Initialize
success = http.HttpJson("POST", "https://api-test.rsap.ca/oauth/token", json, "application/json", resp)
If success = False Then
    Log(http.LastErrorText)
    Return
End If


Dim sbResponseBody As ChilkatStringBuilder
sbResponseBody.Initialize
resp.GetBodySb(sbResponseBody)
Dim jResp As ChilkatJsonObject
jResp.Initialize
jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = False

Log("Response Body:")
Log(jResp.Emit)

Dim respStatusCode As Int = resp.StatusCode
Log("Response Status Code = " & respStatusCode)
If respStatusCode >= 400 Then
    Log("Response Header:")
    Log(resp.Header)
    Log("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")