Delphi DLL Requires Chilkat v10.1.2+

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. Delphi DLL

var
success: Boolean;
oauth2: HCkOAuth2;
url: PWideChar;
numMsWaited: Integer;
json: HCkJsonObject;
dtExpire: HCkDateTime;

begin
success := False;

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

oauth2 := CkOAuth2_Create();

//  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
CkOAuth2_putLocalHost(oauth2,'127.0.0.1');
CkOAuth2_putListenPort(oauth2,3017);

CkOAuth2_putAuthorizationEndpoint(oauth2,'https://x.com/i/oauth2/authorize');
CkOAuth2_putTokenEndpoint(oauth2,'https://api.x.com/2/oauth2/token');

//  Replace this with your actual X.com OAuth2 Client ID and Client Secret
CkOAuth2_putClientId(oauth2,'OAUTH2_CLIENT_ID');
CkOAuth2_putClientSecret(oauth2,'OAUTH2_CLIENT_SECRET');

//  This is for Require Proof Key for Code Exchange (PKCE)
//  See OAuth2 PKCE Explained
CkOAuth2_putCodeChallenge(oauth2,True);
CkOAuth2_putCodeChallengeMethod(oauth2,'S256');

//  Space separated scopes...
CkOAuth2_putScope(oauth2,'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 := CkOAuth2__startAuth(oauth2);
if (CkOAuth2_getLastMethodSuccess(oauth2) <> True) then
  begin
    Memo1.Lines.Add(CkOAuth2__lastErrorText(oauth2));
    Exit;
  end;

Memo1.Lines.Add('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 := CkOAuth2_LaunchBrowser(oauth2,url);
if (success = False) then
  begin
    Memo1.Lines.Add(CkOAuth2__lastErrorText(oauth2));
    Exit;
  end;

//  Wait for the user to approve or deny authorization in the browser.
numMsWaited := 0;
while (numMsWaited < 10000) and (CkOAuth2_getAuthFlowState(oauth2) < 3) do
  begin
    CkOAuth2_SleepMs(oauth2,100);
    numMsWaited := numMsWaited + 100;
  end;

//  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 (CkOAuth2_getAuthFlowState(oauth2) < 3) then
  begin
    CkOAuth2_Cancel(oauth2);
    Memo1.Lines.Add('No response from the browser!');
    Exit;
  end;

//  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 (CkOAuth2_getAuthFlowState(oauth2) = 5) then
  begin
    Memo1.Lines.Add('OAuth2 failed to complete.');
    Memo1.Lines.Add(CkOAuth2__failureInfo(oauth2));
    Exit;
  end;

if (CkOAuth2_getAuthFlowState(oauth2) = 4) then
  begin
    Memo1.Lines.Add('OAuth2 authorization was denied.');
    Memo1.Lines.Add(CkOAuth2__accessTokenResponse(oauth2));
    Exit;
  end;

if (CkOAuth2_getAuthFlowState(oauth2) <> 3) then
  begin
    Memo1.Lines.Add('Unexpected AuthFlowState:' + IntToStr(CkOAuth2_getAuthFlowState(oauth2)));
    Exit;
  end;

Memo1.Lines.Add('OAuth2 authorization granted!');

json := CkJsonObject_Create();
CkJsonObject_Load(json,CkOAuth2__accessTokenResponse(oauth2));
CkJsonObject_putEmitCompact(json,False);

//  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 (CkJsonObject_HasMember(json,'expires_on') = False) then
  begin
    dtExpire := CkDateTime_Create();
    CkDateTime_SetFromCurrentSystemTime(dtExpire);
    CkDateTime_AddSeconds(dtExpire,CkJsonObject_IntOf(json,'expires_in'));
    CkJsonObject_AppendString(json,'expires_on',CkDateTime__getAsUnixTimeStr(dtExpire,False));
  end;

Memo1.Lines.Add('Access Token Response = ' + CkJsonObject__emit(json));

//  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"
//  }

Memo1.Lines.Add('Access Token = ' + CkOAuth2__accessToken(oauth2));

Memo1.Lines.Add('Refresh Token = ' + CkOAuth2__refreshToken(oauth2));

//  Save the JSON access token response to a file for subsequent use..
CkJsonObject_WriteFile(json,'qa_data/tokens/x.json');

//  

CkOAuth2_Dispose(oauth2);
CkJsonObject_Dispose(json);
    CkDateTime_Dispose(dtExpire);