VB.NET

Slack OAuth2

See more OAuth2 Examples

Slack OAuth2 VB.NET

Dim success As Boolean = False

' For more information about the OAuth2, see OAuth 2.0 Authorization Flow

Dim oauth2 As New Chilkat.OAuth2

' This example is for desktop applicatons (it is not for code that runs on a web server).

' Your applicaton must use your own public web server as an intermediate
' to receive and forward the redirect to localhost.
' See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

' This is the Redirect URL defined for your Slack App in the Slack developer portal, and contains the above PHP.
oauth2.AppCallbackUrl = "https://yourwebserver.com/oauth2_redirect"
oauth2.ListenPort = 3017

oauth2.AuthorizationEndpoint = "https://slack.com/oauth/authorize"
oauth2.TokenEndpoint = "https://slack.com/api/oauth.access"

' Replace these with actual values.
oauth2.ClientId = "CLIENT_ID"
oauth2.ClientSecret = "CLIENT_SECRET"

oauth2.Scope = "team:read users:read"

' 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


Debug.WriteLine("url = " & url)

' 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)

' Get the full JSON response:
Dim json As New Chilkat.JsonObject
json.Load(oauth2.AccessTokenResponse)
json.EmitCompact = False

' The JSON response looks like this:

' {
'   "ok": true,
'   "access_token": "xoxp-348475395242-348621810805-4768936228341-9f512b295124e7c9846ce63cb1464c4d",
'   "scope": "identify,team:read,users:read",
'   "user_id": "UA8HZRUPP",
'   "team_id": "TA3DZBN74",
'   "enterprise_id": null,
'   "team_name": "Chilkat Testing"
' }

Debug.WriteLine(json.Emit())

' Save the JSON to a file for future requests.
Dim fac As New Chilkat.FileAccess
fac.WriteEntireTextFile("qa_data/tokens/slack.json",json.Emit(),"utf-8",False)