Delphi DLL Requires Chilkat v11.0.0+

Trello OAuth1 Authorization

See more OAuth1 Examples

Demonstrates OAuth1 authentication for Trello. Delphi DLL

var
success: Boolean;
consumerKey: PWideChar;
consumerSecret: PWideChar;
requestTokenUrl: PWideChar;
authorizeUrl: PWideChar;
accessTokenUrl: PWideChar;
callbackUrl: PWideChar;
callbackLocalPort: Integer;
http: HCkHttp;
req: HCkHttpRequest;
resp: HCkHttpResponse;
hashTab: HCkHashtable;
requestToken: PWideChar;
requestTokenSecret: PWideChar;
sbUrlForBrowser: HCkStringBuilder;
url: PWideChar;
listenSock: HCkSocket;
backLog: Integer;
sock: HCkSocket;
maxWaitMs: Integer;
task: HCkTask;
oauth2: HCkOAuth2;
startLine: PWideChar;
requestHeader: PWideChar;
sbResponseHtml: HCkStringBuilder;
sbResponse: HCkStringBuilder;
sbStartLine: HCkStringBuilder;
numReplacements: Integer;
authVerifier: PWideChar;
accessToken: PWideChar;
accessTokenSecret: PWideChar;
json: HCkJsonObject;
fac: HCkFileAccess;

begin
success := False;

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

consumerKey := 'TRELLO_CONSUMER_KEY';
consumerSecret := 'TRELLO_CONSUMER_SECRET';

requestTokenUrl := 'https://trello.com/1/OAuthGetRequestToken';
authorizeUrl := 'https://trello.com/1/OAuthAuthorizeToken';
accessTokenUrl := 'https://trello.com/1/OAuthGetAccessToken';

//  The port number is picked at random. It's some unused port that won't likely conflict with anything else..
callbackUrl := 'http://localhost:3017/';
callbackLocalPort := 3017;

//  The 1st step in 3-legged OAuth1.0a is to send a POST to the request token URL to obtain an OAuth Request Token
http := CkHttp_Create();

CkHttp_putOAuth1(http,True);
CkHttp_putOAuthConsumerKey(http,consumerKey);
CkHttp_putOAuthConsumerSecret(http,consumerSecret);
CkHttp_putOAuthCallback(http,callbackUrl);

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

resp := CkHttpResponse_Create();
success := CkHttp_HttpReq(http,requestTokenUrl,req,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

//  If successful, the resp.BodyStr contains something like this:  
//  oauth_token=c173ff088a09a67389a42b1ee22366a4&oauth_token_secret=717e6015c6749fe050a923516e739dbb&oauth_callback_confirmed=true
Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));

hashTab := CkHashtable_Create();
CkHashtable_AddQueryParams(hashTab,CkHttpResponse__bodyStr(resp));

requestToken := CkHashtable__lookupStr(hashTab,'oauth_token');
requestTokenSecret := CkHashtable__lookupStr(hashTab,'oauth_token_secret');
CkHttp_putOAuthTokenSecret(http,requestTokenSecret);

Memo1.Lines.Add('oauth_token = ' + requestToken);
Memo1.Lines.Add('oauth_token_secret = ' + requestTokenSecret);

//  ---------------------------------------------------------------------------
//  The next step is to form a URL to send to the authorizeUrl
//  This is an HTTP GET that we load into a popup browser.
sbUrlForBrowser := CkStringBuilder_Create();
CkStringBuilder_Append(sbUrlForBrowser,authorizeUrl);
CkStringBuilder_Append(sbUrlForBrowser,'?oauth_token=');
CkStringBuilder_Append(sbUrlForBrowser,requestToken);
CkStringBuilder_Append(sbUrlForBrowser,'&scope=read,write,account');

url := CkStringBuilder__getAsString(sbUrlForBrowser);

Memo1.Lines.Add('url = ' + url);

//  When the urlForBrowser is loaded into a browser, the response from Trello will redirect back to localhost:3017
//  We'll need to start a socket that is listening on port 3017 for the callback from the browser.
listenSock := CkSocket_Create();

backLog := 5;
success := CkSocket_BindAndListen(listenSock,callbackLocalPort,backLog);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(listenSock));
    Exit;
  end;

//  Wait for the browser's connection in a background thread.
//  (We'll send load the URL into the browser following this..)
//  Wait a max of 60 seconds before giving up.
sock := CkSocket_Create();
maxWaitMs := 60000;
task := CkSocket_AcceptNextAsync(listenSock,maxWaitMs,sock);
CkTask_Run(task);

//  Launch the system's default browser navigated to the URL.
oauth2 := CkOAuth2_Create();
success := CkOAuth2_LaunchBrowser(oauth2,url);
if (success = False) then
  begin
    Memo1.Lines.Add(CkOAuth2__lastErrorText(oauth2));
    Exit;
  end;

//  Wait for the listenSock's task to complete.
success := CkTask_Wait(task,maxWaitMs);
if (not success or (CkTask_getStatusInt(task) <> 7) or (CkTask_getTaskSuccess(task) <> True)) then
  begin
    if (not success) then
      begin
        //  The task.LastErrorText applies to the Wait method call.
        Memo1.Lines.Add(CkTask__lastErrorText(task));
      end
    else
      begin
        //  The ResultErrorText applies to the underlying task method call (i.e. the AcceptNextConnection)
        Memo1.Lines.Add(CkTask__status(task));
        Memo1.Lines.Add(CkTask__resultErrorText(task));
      end;
    CkTask_Dispose(task);
    Exit;
  end;

//  If we get to this point, the connection from the browser arrived and was accepted.

//  We no longer need the listen socket...
//  Stop listening on port 3017.
CkSocket_Close(listenSock,10);

CkTask_Dispose(task);

//  Read the start line of the request..
startLine := CkSocket__receiveUntilMatch(sock,#13#10);
if (CkSocket_getLastMethodSuccess(sock) = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(sock));
    Exit;
  end;

//  Read the request header.
requestHeader := CkSocket__receiveUntilMatch(sock,#13#10 + #13#10);
if (CkSocket_getLastMethodSuccess(sock) = False) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(sock));
    Exit;
  end;

//  The browser SHOULD be sending us a GET request, and therefore there is no body to the request.
//  Once the request header is received, we have all of it.
//  We can now send our HTTP response.
sbResponseHtml := CkStringBuilder_Create();
CkStringBuilder_Append(sbResponseHtml,'<html><body><p>Chilkat thanks you!</b></body</html>');

sbResponse := CkStringBuilder_Create();
CkStringBuilder_Append(sbResponse,'HTTP/1.1 200 OK' + #13#10);
CkStringBuilder_Append(sbResponse,'Content-Length: ');
CkStringBuilder_AppendInt(sbResponse,CkStringBuilder_getLength(sbResponseHtml));
CkStringBuilder_Append(sbResponse,#13#10);
CkStringBuilder_Append(sbResponse,'Content-Type: text/html' + #13#10);
CkStringBuilder_Append(sbResponse,#13#10);
CkStringBuilder_AppendSb(sbResponse,sbResponseHtml);

CkSocket_SendString(sock,CkStringBuilder__getAsString(sbResponse));
CkSocket_Close(sock,50);

//  The information we need is in the startLine.
//  For example, the startLine will look something like this:
//   GET /?oauth_token=c173ff088a09a67389b42b1ee32366a4&oauth_verifier=c65bc8eed882e04bb94023bb12c0dbef HTTP/1.1
sbStartLine := CkStringBuilder_Create();
CkStringBuilder_Append(sbStartLine,startLine);
numReplacements := CkStringBuilder_Replace(sbStartLine,'GET /?','');
numReplacements := CkStringBuilder_Replace(sbStartLine,' HTTP/1.1','');
CkStringBuilder_Trim(sbStartLine);

//  oauth_token=c173ff088a09a67389b42b1ee32366a4&oauth_verifier=c65bc8eed882e04bb94023bb12c0dbef
Memo1.Lines.Add('startline: ' + CkStringBuilder__getAsString(sbStartLine));

CkHashtable_Clear(hashTab);
CkHashtable_AddQueryParams(hashTab,CkStringBuilder__getAsString(sbStartLine));

requestToken := CkHashtable__lookupStr(hashTab,'oauth_token');
authVerifier := CkHashtable__lookupStr(hashTab,'oauth_verifier');

//  ------------------------------------------------------------------------------
//  Finally , we must exchange the OAuth Request Token for an OAuth Access Token.

CkHttp_putOAuthToken(http,requestToken);
CkHttp_putOAuthVerifier(http,authVerifier);CkHttpRequest_putHttpVerb(req,'POST');

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

success := CkHttp_HttpReq(http,accessTokenUrl,req,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

//  Make sure a successful response was received.
if (CkHttpResponse_getStatusCode(resp) <> 200) then
  begin
    Memo1.Lines.Add(CkHttpResponse__statusLine(resp));
    Memo1.Lines.Add(CkHttpResponse__header(resp));
    Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));
    Exit;
  end;

//  If successful, the resp.BodyStr contains something like this:
//  oauth_token=4618e19f5101b7199f75aA9e678d1585576ad84fb89fa40c85c4da13589010d5&oauth_token_secret=64a997b26ea1f47105eca36ce1a5d22e
Memo1.Lines.Add('response BodyStr = ' + CkHttpResponse__bodyStr(resp));

CkHashtable_Clear(hashTab);
CkHashtable_AddQueryParams(hashTab,CkHttpResponse__bodyStr(resp));

accessToken := CkHashtable__lookupStr(hashTab,'oauth_token');
accessTokenSecret := CkHashtable__lookupStr(hashTab,'oauth_token_secret');

//  The access token + secret is what should be saved and used for
//  subsequent REST API calls.
Memo1.Lines.Add('Access Token = ' + accessToken);
Memo1.Lines.Add('Access Token Secret = ' + accessTokenSecret);

//  Save the access token for subsequent REST API calls.
json := CkJsonObject_Create();
CkJsonObject_AppendString(json,'oauth_token',accessToken);
CkJsonObject_AppendString(json,'oauth_token_secret',accessTokenSecret);

fac := CkFileAccess_Create();
CkFileAccess_WriteEntireTextFile(fac,'qa_data/tokens/trello.json',CkJsonObject__emit(json),'utf-8',False);

Memo1.Lines.Add('Success.');

CkHttp_Dispose(http);
CkHttpRequest_Dispose(req);
CkHttpResponse_Dispose(resp);
CkHashtable_Dispose(hashTab);
CkStringBuilder_Dispose(sbUrlForBrowser);
CkSocket_Dispose(listenSock);
CkSocket_Dispose(sock);
CkOAuth2_Dispose(oauth2);
CkStringBuilder_Dispose(sbResponseHtml);
CkStringBuilder_Dispose(sbResponse);
CkStringBuilder_Dispose(sbStartLine);
CkJsonObject_Dispose(json);
CkFileAccess_Dispose(fac);