(Xojo Plugin) Salesforce OAuth2 Refresh Access Token

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Note: Use Chilkat v10.1.2 or later for this example.

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

// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file 
// saved by this example: Get SalesForce OAuth2 Access Token via Authorization Flow

Dim jsonToken As New Chilkat.JsonObject
Dim success As Boolean
success = jsonToken.LoadFile("qa_data/tokens/_salesforce.json")
If (success <> True) Then
    System.DebugLog("Failed to load _salesforce.json")
    Return
End If

// This is an example of a Salesforce OAuth2 access token to be refreshed:

// {
//   "access_token": "00D41000....uLZBpT6",
//   "refresh_token": "5Aep....25xdGgkrV",
//   "signature": "cjTbSc5DvcKpaMoRTzuQTJLb1tcMw8LEO01flq4aMD4=",
//   "scope": "refresh_token id",
//   "instance_url": "https://d41000000f8a0eak-dev-ed.my.salesforce.com",
//   "id": "https://login.salesforce.com/id/00D41000000F8A0EAK/005410000....xAAE",
//   "token_type": "Bearer",
//   "issued_at": "1738348388166"
// }

Dim oauth2 As New Chilkat.OAuth2

oauth2.TokenEndpoint = "https://login.salesforce.com/services/oauth2/token"

// Replace this with your actual client ID (Consumer Key)
oauth2.ClientId = "CLIENT_ID"

// Note: The client secret is not required because we configured our Connected App
// to not require it for the refresh flow.  See the screenshot below.

// Get the "refresh_token"
oauth2.RefreshToken = jsonToken.StringOf("refresh_token")

// Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken()
If (success <> True) Then
    System.DebugLog(oauth2.LastErrorText)
    Return
End If

// The response contains a new access token, but we must keep
// our existing refresh token for when we need to refresh again in the future.
success = jsonToken.UpdateString("access_token",oauth2.AccessToken)

// Save the new JSON access token response to a file.
Dim sbJson As New Chilkat.StringBuilder
jsonToken.EmitCompact = False
success = jsonToken.EmitSb(sbJson)
success = sbJson.WriteFile("qa_data/tokens/_salesforce.json","utf-8",False)

System.DebugLog("OAuth2 authorization granted!")
System.DebugLog("New Access Token = " + oauth2.AccessToken)

// --------------------------------------------------------------------------
// Here's a screenshot of a Salesforce Connected App 
// which does not requires the secret for the authorization or refresh flow.
//