Delphi DLL

X.com App only authentication and OAuth 2.0 Bearer Token

See more X Examples

Demonstrates how to obtain an X.com OAuth2 token for application-only authentication.

This allows you to issue authenticated requests on behalf of the application itself (as opposed to on behalf of a specific user). You don’t have the context of an authenticated user and this means that any request to API for endpoints that require user context, such as posting Tweets, will not work.

Your app will be able to, for example:

• Pull user timelines;
• Access friends and followers of any account;
• Access lists resources;
• Search in Tweets;

And it will not be able to:

• Post Tweets or other resources;
• Connect to Streaming endpoints;
• Search for users;
• Use any geo endpoint;
• Access Direct Messages or account credentials;

Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, HttpRequest, HttpResponse, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
consumerKey: PWideChar;
consumerSecret: PWideChar;
http: HCkHttp;
req: HCkHttpRequest;
resp: HCkHttpResponse;
json: HCkJsonObject;

begin
success := False;

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

// Update these values with your consumer key and secret (also known as API Key and API Key Secret).
consumerKey := 'X_CONSUMER_KEY';
consumerSecret := 'X_CONSUMER_SECRET';

http := CkHttp_Create();

CkHttp_putBasicAuth(http,True);
CkHttp_putLogin(http,consumerKey);
CkHttp_putPassword(http,consumerSecret);

req := CkHttpRequest_Create();
CkHttpRequest_AddParam(req,'grant_type','client_credentials');

CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putContentType(req,'application/x-www-form-urlencoded');

resp := CkHttpResponse_Create();
success := CkHttp_HttpReq(http,'https://api.x.com/oauth2/token',req,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add('Response Status Code: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));

if (CkHttpResponse_getStatusCode(resp) <> 200) then
  begin
    Memo1.Lines.Add('Expected a 200 response status code for success.');
    Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));
    Exit;
  end;

// We should get a JSON response like this:

// {
//     "token_type":"bearer",
//     "access_token":"..."
// }

json := CkJsonObject_Create();
CkJsonObject_Load(json,CkHttpResponse__bodyStr(resp));

Memo1.Lines.Add('Access token = ' + CkJsonObject__stringOf(json,'access_token'));

CkHttp_Dispose(http);
CkHttpRequest_Dispose(req);
CkHttpResponse_Dispose(resp);
CkJsonObject_Dispose(json);

end;