(Delphi DLL) AzureWebsites OAuth2 Password Flow

Demonstrates how to do OAuth 2.0 password flow for azurewebsites.net.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX 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, StringBuilder, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
success: Boolean;
req: HCkHttpRequest;
tokenEndpoint: PWideChar;
resp: HCkHttpResponse;
sbResponseBody: HCkStringBuilder;
jResp: HCkJsonObject;
respStatusCode: Integer;
sbXml: HCkStringBuilder;
destUrl: PWideChar;

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

http := CkHttp_Create();

req := CkHttpRequest_Create();
CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putPath(req,'/token');
CkHttpRequest_putContentType(req,'application/x-www-form-urlencoded');
CkHttpRequest_AddParam(req,'grant_type','password');
CkHttpRequest_AddParam(req,'username','your_username');
CkHttpRequest_AddParam(req,'password','your_password');

tokenEndpoint := 'https://your_api.azurewebsites.net/token';
resp := CkHttp_PostUrlEncoded(http,tokenEndpoint,req);
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

sbResponseBody := CkStringBuilder_Create();
CkHttpResponse_GetBodySb(resp,sbResponseBody);
jResp := CkJsonObject_Create();
CkJsonObject_LoadSb(jResp,sbResponseBody);
CkJsonObject_putEmitCompact(jResp,False);

Memo1.Lines.Add('Response Body:');
Memo1.Lines.Add(CkJsonObject__emit(jResp));

// Sample JSON response:

// {
//   "access_token": "NQGHn ... xTS",
//   "token_type": "bearer",
//   "expires_in": 1209599,
//   "userName": "your_username",
//   ".issued": "Mon, 27 Apr 2020 23:49:35 GMT",
//   ".expires": "Mon, 11 May 2020 23:49:35 GMT"
// }

respStatusCode := CkHttpResponse_getStatusCode(resp);
Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkHttpResponse__header(resp));
    Memo1.Lines.Add('Failed.');
    CkHttpResponse_Dispose(resp);
    Exit;
  end;
CkHttpResponse_Dispose(resp);

// ----------------------------------
// Use the OAuth2 token in a request.
// For example...

sbXml := CkStringBuilder_Create();
success := CkStringBuilder_LoadFile(sbXml,'c:/someDir/someXmlFile.xml','utf-8');
if (success = False) then
  begin
    Memo1.Lines.Add('Failed to load the XML file.');
    Exit;
  end;

// Get the OAuth2 token and use it for authentication
CkHttp_putAuthToken(http,CkJsonObject__stringOf(jResp,'token'));

destUrl := 'https://your_api.azurewebsites.net/destinationUrl';
resp := CkHttp_PostXml(http,destUrl,CkStringBuilder__getAsString(sbXml),'utf-8');
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

respStatusCode := CkHttpResponse_getStatusCode(resp);
Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkHttpResponse__header(resp));
    Memo1.Lines.Add('Failed.');
    CkHttpResponse_Dispose(resp);
    Exit;
  end;

// Examine the response body
Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));

CkHttpResponse_Dispose(resp);

CkHttp_Dispose(http);
CkHttpRequest_Dispose(req);
CkStringBuilder_Dispose(sbResponseBody);
CkJsonObject_Dispose(jResp);
CkStringBuilder_Dispose(sbXml);

end;