Delphi DLL Requires Chilkat v11.0.0+

Twitter - Application Only Authentication

Demonstrates how to get a Twitter OAuth2 token for application-only authentication.

This example is deprecated and no longer valid.

Delphi DLL

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.

//  Note: Define your Twitter apps at https://apps.twitter.com/

//  We're going to send an HTTPS POST that looks like this:

//  POST /oauth2/token HTTP/1.1
//  Host: api.twitter.com
//  User-Agent: My Twitter App v1.0.23
//  Authorization: Basic eHZ6MWV2RlM0d0VFUFRHRUZQSEJvZzpMOHFxOVBaeVJn
//                       NmllS0dFS2hab2xHQzB2SldMdzhpRUo4OERSZHlPZw==
//  Content-Type: application/x-www-form-urlencoded;charset=UTF-8
//  Content-Length: 29
//  Accept-Encoding: gzip
//  
//  grant_type=client_credentials

//  Update these values with your consumer key and secret (also known as API key and API secret).
consumerKey := 'TWITTER_CONSUMER_KEY';
consumerSecret := 'TWITTER_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.twitter.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);