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Twitter API v2 - Get OAuth2 Access Token

Demonstrates how to get a Twitter API v2 OAuth2 access token from a desktop application or script.

This example is deprecated and no longer valid.

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Local $bSuccess = False

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

$oOauth2 = ObjCreate("Chilkat.OAuth2")

;  This should be the port in the localhost callback URI for your App (defined in the Twitter Developer Portal)
;  The Callback URI / Redirect URL should be "http://localhost:3017/" if the port number is 3017.
$oOauth2.ListenPort = 3017

$oOauth2.AuthorizationEndpoint = "https://twitter.com/i/oauth2/authorize"
$oOauth2.TokenEndpoint = "https://api.twitter.com/2/oauth2/token"

;  Replace these with actual values.
$oOauth2.ClientId = "CLIENT_ID"
$oOauth2.ClientSecret = "CLIENT_SECRET"

$oOauth2.Scope = "tweet.read users.read follows.read follows.write"

$oOauth2.AddAuthQueryParam("offline.access","")
$oOauth2.AddAuthQueryParam("state","state")
$oOauth2.CodeChallenge = True
$oOauth2.CodeChallengeMethod = "plain"
$oOauth2.UseBasicAuth = True

;  Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
Local $sUrl = $oOauth2.StartAuth()
If ($oOauth2.LastMethodSuccess = False) Then
    ConsoleWrite($oOauth2.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite($sUrl & @CRLF)

;  Launch the system's default browser navigated to the URL.
$bSuccess = $oOauth2.LaunchBrowser($sUrl)
If ($bSuccess = False) Then
    ConsoleWrite($oOauth2.LastErrorText & @CRLF)
    Exit
EndIf

;  Now wait for the authorization.
;  We'll wait for a max of 60 seconds.
Local $iNumMsWaited = 0
While ($iNumMsWaited < 60000) And ($oOauth2.AuthFlowState < 3)
    $oOauth2.SleepMs 100
    $iNumMsWaited = $iNumMsWaited + 100
Wend

;  If there was no response from the browser within 60 seconds, then 
;  the AuthFlowState will be equal to 1 or 2.
;  1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
;  2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
;  In that case, cancel the background task started in the call to StartAuth.
If ($oOauth2.AuthFlowState < 3) Then
    $oOauth2.Cancel()
    ConsoleWrite("No response from the browser!" & @CRLF)
    Exit
EndIf

;  Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
;  The possible AuthFlowState values are:
;  3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
;  4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
;  5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
If ($oOauth2.AuthFlowState = 5) Then
    ConsoleWrite("OAuth2 failed to complete." & @CRLF)
    ConsoleWrite($oOauth2.FailureInfo & @CRLF)
    Exit
EndIf

If ($oOauth2.AuthFlowState = 4) Then
    ConsoleWrite("OAuth2 authorization was denied." & @CRLF)
    ConsoleWrite($oOauth2.AccessTokenResponse & @CRLF)
    Exit
EndIf

If ($oOauth2.AuthFlowState <> 3) Then
    ConsoleWrite("Unexpected AuthFlowState:" & $oOauth2.AuthFlowState & @CRLF)
    Exit
EndIf

ConsoleWrite("OAuth2 authorization granted!" & @CRLF)
ConsoleWrite("Access Token = " & $oOauth2.AccessToken & @CRLF)

;  Get the full JSON response:
$oJson = ObjCreate("Chilkat.JsonObject")
$oJson.Load($oOauth2.AccessTokenResponse)
$oJson.EmitCompact = False

;  The JSON response looks like this:

;  {
;    "token_type": "bearer",
;    "expires_in": 7200,
;    "access_token": "NnAfRUxCVWhLNDB3MFRvd25yQlNnelRZY1F1WkFlQqVfNXYwOEVobVNqR0VfOjf2NTg4NDk0MjMxnzE6MTowOmF2OjE",
;    "scope": "users.read follows.read tweet.read follows.write"
;  }

ConsoleWrite($oJson.Emit() & @CRLF)

;  Save the JSON to a file for future requests.
$oFac = ObjCreate("Chilkat.FileAccess")
$oFac.WriteEntireTextFile("qa_data/tokens/twitter_v2_oauth2.json",$oJson.Emit(),"utf-8",False)