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Classic ASP

X.com OAuth 2.0 Authorization Code with PKCE

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Demonstrates how to get an X.com OAuth2 access token from a desktop application or script.

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Classic ASP 
<html>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<%
success = 0

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

set oauth2 = Server.CreateObject("Chilkat.OAuth2")

' The port should match the Authorized Redirect URL in your X.com app, 
' which would look like "http://127.0.0.1:3017/"
' See the screenshot below of the App Settings in the X Developer Portal
oauth2.LocalHost = "127.0.0.1"
oauth2.ListenPort = 3017

oauth2.AuthorizationEndpoint = "https://x.com/i/oauth2/authorize"
oauth2.TokenEndpoint = "https://api.x.com/2/oauth2/token"

' Replace this with your actual X.com OAuth2 Client ID and Client Secret
oauth2.ClientId = "OAUTH2_CLIENT_ID"
oauth2.ClientSecret = "OAUTH2_CLIENT_SECRET"

' This is for Require Proof Key for Code Exchange (PKCE)
' See OAuth2 PKCE Explained
oauth2.CodeChallenge = 1
oauth2.CodeChallengeMethod = "S256"

' Space separated scopes...
oauth2.Scope = "tweet.read tweet.write users.read follows.read follows.write offline.access like.read like.write block.read block.write"

' Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
url = oauth2.StartAuth()
If (oauth2.LastMethodSuccess <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( oauth2.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "url = " & url) & "</pre>"

' 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 = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( oauth2.LastErrorText) & "</pre>"
    Response.End
End If

' Wait for the user to approve or deny authorization in the browser.
numMsWaited = 0
Do While (numMsWaited < 10000) And (oauth2.AuthFlowState < 3)
    oauth2.SleepMs 100
    numMsWaited = numMsWaited + 100
Loop

' 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
    success = oauth2.Cancel()
    Response.Write "<pre>" & Server.HTMLEncode( "No response from the browser!") & "</pre>"
    Response.End
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
    Response.Write "<pre>" & Server.HTMLEncode( "OAuth2 failed to complete.") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( oauth2.FailureInfo) & "</pre>"
    Response.End
End If

If (oauth2.AuthFlowState = 4) Then
    Response.Write "<pre>" & Server.HTMLEncode( "OAuth2 authorization was denied.") & "</pre>"
    Response.Write "<pre>" & Server.HTMLEncode( oauth2.AccessTokenResponse) & "</pre>"
    Response.End
End If

If (oauth2.AuthFlowState <> 3) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Unexpected AuthFlowState:" & oauth2.AuthFlowState) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "OAuth2 authorization granted!") & "</pre>"

set json = Server.CreateObject("Chilkat.JsonObject")
success = json.Load(oauth2.AccessTokenResponse)
json.EmitCompact = 0

' If an "expires_on" member does not exist, then add the JSON member by
' getting the current system date/time and adding the "expires_in" seconds.
' This way we'll know when the token expires.
If (json.HasMember("expires_on") = 0) Then
    set dtExpire = Server.CreateObject("Chilkat.CkDateTime")
    success = dtExpire.SetFromCurrentSystemTime()
    success = dtExpire.AddSeconds(json.IntOf("expires_in"))
    success = json.AppendString("expires_on",dtExpire.GetAsUnixTimeStr(0))
End If

Response.Write "<pre>" & Server.HTMLEncode( "Access Token Response = " & json.Emit()) & "</pre>"

' A sample access token response:

' {
'   "token_type": "bearer",
'   "expires_in": 7200,
'   "access_token": "VmNDLVZiYUZwejY5Mkx3RblFTmo3ek1leTRGclMuZFVOUTVUTWpNbVZKb1N5OjE3NDAxNjk4MDVxNTE6MToxOaF0OjE",
'   "scope": "block.read follows.read offline.access tweet.write block.write like.write like.read users.read tweet.read follows.write",
'   "refresh_token": "eThOWVVFSTRqdVp3QTFndGsxM2ZGZmFyNWVrU0phM1JKbGdrbGNWRGJzb1loOjE3NDAwMjk4MDUxNTI6MTowOnJ0OjE"
' }

Response.Write "<pre>" & Server.HTMLEncode( "Access Token = " & oauth2.AccessToken) & "</pre>"

Response.Write "<pre>" & Server.HTMLEncode( "Refresh Token = " & oauth2.RefreshToken) & "</pre>"

' Save the JSON access token response to a file for subsequent use..
success = json.WriteFile("qa_data/tokens/x.json")

' image

%>
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