VB.NET

GeoOp OAuth2 Authorisation Code Grant (Public App)

See more OAuth2 Examples

Demonstrates how to get an access token for a GeoOp Third-Party Public Application using the Authorisation Code Grant flow. VB.NET

Dim success As Boolean = False

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

Dim oauth2 As New Chilkat.OAuth2

' This should match the Site URL configured for your GeoOp (non-Server) Application, such as "http://localhost:3017/"
oauth2.ListenPort = 3017

oauth2.AuthorizationEndpoint = "https://login.geoop.com/oauth2/code"
oauth2.TokenEndpoint = "https://login.geoop.com/oauth2/token"

' Replace the client ID with an actual value.
oauth2.ClientId = "GEOOP-APPLICATION-ID"
' The ClientSecret should remain empty for a GeoOp public application
oauth2.ClientSecret = ""

' We need a few special settings for GeoOp
oauth2.Scope = "default"
oauth2.CodeChallenge = False
' Setting LocalHost equal to "none" prevents the "redirect_uri" query param from being sent in the initial HTTP request.
' Note: The GeoOp Application should still have a redirect URL specified as "http://localhost:3017/", where the port
' number matches the ListenPort above.
oauth2.LocalHost = "none"

' Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
Dim url As String = oauth2.StartAuth()
If (oauth2.LastMethodSuccess <> True) Then
    Debug.WriteLine(oauth2.LastErrorText)
    Exit Sub
End If


' Launch the default browser on the system and navigate to the url.
' The LaunchBrowser method was added in Chilkat v10.1.2.
success = oauth2.LaunchBrowser(url)
If (success = False) Then
    Debug.WriteLine(oauth2.LastErrorText)
    Exit Sub
End If


' Wait for the user to approve or deny authorization in the browser.
Dim numMsWaited As Integer = 0
While (numMsWaited < 90000) And (oauth2.AuthFlowState < 3)
    oauth2.SleepMs(100)
    numMsWaited = numMsWaited + 100
End While

' If the browser does not respond within the specified time, AuthFlowState will be:
' 
' 1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
' 2: Waiting for Final Response – The thread is awaiting the final access token response.
' In either case, cancel the background task initiated by StartAuth.

If (oauth2.AuthFlowState < 3) Then
    oauth2.Cancel()
    Debug.WriteLine("No response from the browser!")
    Exit Sub
End If


' Check AuthFlowState to determine if authorization was granted, denied, or failed:
' 
' 3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
' 4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
' 5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

If (oauth2.AuthFlowState = 5) Then
    Debug.WriteLine("OAuth2 failed to complete.")
    Debug.WriteLine(oauth2.FailureInfo)
    Exit Sub
End If


If (oauth2.AuthFlowState = 4) Then
    Debug.WriteLine("OAuth2 authorization was denied.")
    Debug.WriteLine(oauth2.AccessTokenResponse)
    Exit Sub
End If


If (oauth2.AuthFlowState <> 3) Then
    Debug.WriteLine("Unexpected AuthFlowState:" & oauth2.AuthFlowState)
    Exit Sub
End If

Debug.WriteLine("OAuth2 authorization granted!")
Debug.WriteLine("Access Token = " & oauth2.AccessToken)

' Save the entire JSON response, which includes the access token, for future calls.
' The JSON AccessTokenResponse looks like this:
' {"access_token":"e6dqdG....mzjpT04w==","token_type":"Bearer","expires_in":2592000,"owner_id":984236}

Dim fac As New Chilkat.FileAccess
fac.WriteEntireTextFile("qa_data/tokens/geoop.json",oauth2.AccessTokenResponse,"utf-8",False)

Debug.WriteLine("Success.")