CEF4Delphi/source/uCEFRequestHandler.pas

// ************************************************************************
// ***************************** CEF4Delphi *******************************
// ************************************************************************
//
// CEF4Delphi is based on DCEF3 which uses CEF3 to embed a chromium-based
// browser in Delphi applications.
//
// The original license of DCEF3 still applies to CEF4Delphi.
//
// For more information about CEF4Delphi visit :
//         https://www.briskbard.com/index.php?lang=en&pageid=cef
//
//        Copyright <20> 2018 Salvador D<>az Fau. All rights reserved.
//
// ************************************************************************
// ************ vvvv Original license and comments below vvvv *************
// ************************************************************************
(*
 *                       Delphi Chromium Embedded 3
 *
 * Usage allowed under the restrictions of the Lesser GNU General Public License
 * or alternatively the restrictions of the Mozilla Public License 1.1
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 *
 * Unit owner : Henri Gourvest <hgourvest@gmail.com>
 * Web site   : http://www.progdigy.com
 * Repository : http://code.google.com/p/delphichromiumembedded/
 * Group      : http://groups.google.com/group/delphichromiumembedded
 *
 * Embarcadero Technologies, Inc is not permitted to use or redistribute
 * this source code without explicit permission.
 *
 *)

unit uCEFRequestHandler;

{$IFNDEF CPUX64}
  {$ALIGN ON}
  {$MINENUMSIZE 4}
{$ENDIF}

{$I cef.inc}

interface

uses
  uCEFBaseRefCounted, uCEFInterfaces, uCEFTypes;

type
  TCefRequestHandlerOwn = class(TCefBaseRefCountedOwn, ICefRequestHandler)
    protected
      function  OnBeforeBrowse(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; user_gesture, isRedirect: Boolean): Boolean; virtual;
      function  OnOpenUrlFromTab(const browser: ICefBrowser; const frame: ICefFrame; const targetUrl: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean): Boolean; virtual;
      function  OnBeforeResourceLoad(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const callback: ICefRequestCallback): TCefReturnValue; virtual;
      function  GetResourceHandler(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest): ICefResourceHandler; virtual;
      procedure OnResourceRedirect(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse; var newUrl: ustring); virtual;
      function  OnResourceResponse(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse): Boolean; virtual;
      function  GetResourceResponseFilter(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse): ICefResponseFilter; virtual;
      procedure OnResourceLoadComplete(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse; status: TCefUrlRequestStatus; receivedContentLength: Int64); virtual;
      function  GetAuthCredentials(const browser: ICefBrowser; const frame: ICefFrame; isProxy: Boolean; const host: ustring; port: Integer; const realm, scheme: ustring; const callback: ICefAuthCallback): Boolean; virtual;
      function  CanGetCookies(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest): boolean; virtual;
      function  CanSetCookie(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const cookie : PCefCookie): boolean; virtual;
      function  OnQuotaRequest(const browser: ICefBrowser; const originUrl: ustring; newSize: Int64; const callback: ICefRequestCallback): Boolean; virtual;
      function  GetCookieManager(const browser: ICefBrowser; const mainUrl: ustring): ICefCookieManager; virtual;
      procedure OnProtocolExecution(const browser: ICefBrowser; const url: ustring; out allowOsExecution: Boolean); virtual;
      function  OnCertificateError(const browser: ICefBrowser; certError: TCefErrorcode; const requestUrl: ustring; const sslInfo: ICefSslInfo; const callback: ICefRequestCallback): Boolean; virtual;
      function  OnSelectClientCertificate(const browser: ICefBrowser; isProxy: boolean; const host: ustring; port: integer; certificatesCount: NativeUInt; const certificates: TCefX509CertificateArray; const callback: ICefSelectClientCertificateCallback): boolean; virtual;
      procedure OnPluginCrashed(const browser: ICefBrowser; const pluginPath: ustring); virtual;
      procedure OnRenderViewReady(const browser: ICefBrowser); virtual;
      procedure OnRenderProcessTerminated(const browser: ICefBrowser; status: TCefTerminationStatus); virtual;

      procedure RemoveReferences; virtual;

    public
      constructor Create; virtual;
  end;

  TCustomRequestHandler = class(TCefRequestHandlerOwn)
    protected
      FEvents : Pointer;

      function  OnBeforeBrowse(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; user_gesture, isRedirect: Boolean): Boolean; override;
      function  OnOpenUrlFromTab(const browser: ICefBrowser; const frame: ICefFrame; const targetUrl: ustring; targetDisposition: TCefWindowOpenDisposition; userGesture: Boolean): Boolean; override;
      function  OnBeforeResourceLoad(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const callback: ICefRequestCallback): TCefReturnValue; override;
      function  GetResourceHandler(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest): ICefResourceHandler; override;
      procedure OnResourceRedirect(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse; var newUrl: ustring); override;
      function  OnResourceResponse(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse): Boolean; override;
      function  GetResourceResponseFilter(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse): ICefResponseFilter; override;
      procedure OnResourceLoadComplete(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const response: ICefResponse; status: TCefUrlRequestStatus; receivedContentLength: Int64); override;
      function  GetAuthCredentials(const browser: ICefBrowser; const frame: ICefFrame; isProxy: Boolean; const host: ustring; port: Integer; const realm, scheme: ustring; const callback: ICefAuthCallback): Boolean; override;
      function  CanGetCookies(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest): boolean; override;
      function  CanSetCookie(const browser: ICefBrowser; const frame: ICefFrame; const request: ICefRequest; const cookie : PCefCookie): boolean; override;
      function  OnQuotaRequest(const browser: ICefBrowser; const originUrl: ustring; newSize: Int64; const callback: ICefRequestCallback): Boolean; override;
      procedure OnProtocolExecution(const browser: ICefBrowser; const url: ustring; out allowOsExecution: Boolean); override;
      function  OnCertificateError(const browser: ICefBrowser; certError: TCefErrorcode; const requestUrl: ustring; const sslInfo: ICefSslInfo; const callback: ICefRequestCallback): Boolean; override;
      function  OnSelectClientCertificate(const browser: ICefBrowser; isProxy: boolean; const host: ustring; port: integer; certificatesCount: NativeUInt; const certificates: TCefX509CertificateArray; const callback: ICefSelectClientCertificateCallback): boolean; override;
      procedure OnPluginCrashed(const browser: ICefBrowser; const pluginPath: ustring); override;
      procedure OnRenderViewReady(const browser: ICefBrowser); override;
      procedure OnRenderProcessTerminated(const browser: ICefBrowser; status: TCefTerminationStatus); override;

      procedure RemoveReferences; override;

    public
      constructor Create(const events: Pointer); reintroduce; virtual;
      destructor  Destroy; override;
  end;

implementation

uses
  {$IFDEF DELPHI16_UP}
  {$IFDEF MSWINDOWS}WinApi.Windows,{$ENDIF} System.SysUtils,
  {$ELSE}
  Windows, SysUtils,
  {$ENDIF}
  uCEFMiscFunctions, uCEFLibFunctions, uCEFBrowser, uCEFFrame, uCEFRequest, uCEFRequestCallback,
  uCEFResponse, uCEFAuthCallback, uCEFSslInfo, uCEFSelectClientCertificateCallback, uCEFX509Certificate,
  uCEFApplication;

function cef_request_handler_on_before_browse(self         : PCefRequestHandler;
                                              browser      : PCefBrowser;
                                              frame        : PCefFrame;
                                              request      : PCefRequest;
                                              user_gesture : Integer;
                                              isRedirect   : Integer): Integer; stdcall;
var
  TempObject : TObject;
begin
  Result     := Ord(False);
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := Ord(TCefRequestHandlerOwn(TempObject).OnBeforeBrowse(TCefBrowserRef.UnWrap(browser),
                                                                   TCefFrameRef.UnWrap(frame),
                                                                   TCefRequestRef.UnWrap(request),
                                                                   user_gesture <> 0,
                                                                   isRedirect <> 0));
end;

function cef_request_handler_on_open_urlfrom_tab(      self               : PCefRequestHandler;
                                                       browser            : PCefBrowser;
                                                       frame              : PCefFrame;
                                                 const target_url         : PCefString;
                                                       target_disposition : TCefWindowOpenDisposition;
                                                       user_gesture       : Integer): Integer; stdcall;
var
  TempObject : TObject;
begin
  Result     := Ord(False);
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := Ord(TCefRequestHandlerOwn(TempObject).OnOpenUrlFromTab(TCefBrowserRef.UnWrap(browser),
                                                                     TCefFrameRef.UnWrap(frame),
                                                                     CefString(target_url),
                                                                     target_disposition,
                                                                     user_gesture <> 0));
end;

function cef_request_handler_on_before_resource_load(self     : PCefRequestHandler;
                                                     browser  : PCefBrowser;
                                                     frame    : PCefFrame;
                                                     request  : PCefRequest;
                                                     callback : PCefRequestCallback): TCefReturnValue; stdcall;
var
  TempObject : TObject;
begin
  Result     := RV_CONTINUE;
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := TCefRequestHandlerOwn(TempObject).OnBeforeResourceLoad(TCefBrowserRef.UnWrap(browser),
                                                                     TCefFrameRef.UnWrap(frame),
                                                                     TCefRequestRef.UnWrap(request),
                                                                     TcefRequestCallbackRef.UnWrap(callback));
end;

function cef_request_handler_get_resource_handler(self    : PCefRequestHandler;
                                                  browser : PCefBrowser;
                                                  frame   : PCefFrame;
                                                  request : PCefRequest): PCefResourceHandler; stdcall;
var
  TempObject : TObject;
begin
  Result     := nil;
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := CefGetData(TCefRequestHandlerOwn(TempObject).GetResourceHandler(TCefBrowserRef.UnWrap(browser),
                                                                              TCefFrameRef.UnWrap(frame),
                                                                              TCefRequestRef.UnWrap(request)));
end;

procedure cef_request_handler_on_resource_redirect(self     : PCefRequestHandler;
                                                   browser  : PCefBrowser;
                                                   frame    : PCefFrame;
                                                   request  : PCefRequest;
                                                   response : PCefResponse;
                                                   new_url  : PCefString); stdcall;
var
  TempURL    : ustring;
  TempObject : TObject;
begin
  TempURL    := CefString(new_url);
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    TCefRequestHandlerOwn(TempObject).OnResourceRedirect(TCefBrowserRef.UnWrap(browser),
                                                         TCefFrameRef.UnWrap(frame),
                                                         TCefRequestRef.UnWrap(request),
                                                         TCefResponseRef.UnWrap(response),
                                                         TempURL);

  if (TempURL <> '') then CefStringSet(new_url, TempURL);
end;

function cef_request_handler_on_resource_response(self     : PCefRequestHandler;
                                                  browser  : PCefBrowser;
                                                  frame    : PCefFrame;
                                                  request  : PCefRequest;
                                                  response : PCefResponse): Integer; stdcall;
var
  TempObject : TObject;
begin
  Result     := Ord(False);
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := Ord(TCefRequestHandlerOwn(TempObject).OnResourceResponse(TCefBrowserRef.UnWrap(browser),
                                                                       TCefFrameRef.UnWrap(frame),
                                                                       TCefRequestRef.UnWrap(request),
                                                                       TCefResponseRef.UnWrap(response)));
end;

function cef_request_handler_get_resource_response_filter(self     : PCefRequestHandler;
                                                          browser  : PCefBrowser;
                                                          frame    : PCefFrame;
                                                          request  : PCefRequest;
                                                          response : PCefResponse): PCefResponseFilter; stdcall;
var
  TempObject : TObject;
begin
  Result     := nil;
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := CefGetData(TCefRequestHandlerOwn(TempObject).GetResourceResponseFilter(TCefBrowserRef.UnWrap(browser),
                                                                                     TCefFrameRef.UnWrap(frame),
                                                                                     TCefRequestRef.UnWrap(request),
                                                                                     TCefResponseRef.UnWrap(response)));
end;

procedure cef_request_handler_on_resource_load_complete(self                    : PCefRequestHandler;
                                                        browser                 : PCefBrowser;
                                                        frame                   : PCefFrame;
                                                        request                 : PCefRequest;
                                                        response                : PCefResponse;
                                                        status                  : TCefUrlRequestStatus;
                                                        received_content_length : Int64); stdcall;
var
  TempObject : TObject;
begin
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    TCefRequestHandlerOwn(TempObject).OnResourceLoadComplete(TCefBrowserRef.UnWrap(browser),
                                                             TCefFrameRef.UnWrap(frame),
                                                             TCefRequestRef.UnWrap(request),
                                                             TCefResponseRef.UnWrap(response),
                                                             status,
                                                             received_content_length);
end;

function cef_request_handler_get_auth_credentials(      self     : PCefRequestHandler;
                                                        browser  : PCefBrowser;
                                                        frame    : PCefFrame;
                                                        isProxy  : Integer;
                                                  const host     : PCefString;
                                                        port     : Integer;
                                                  const realm    : PCefString;
                                                  const scheme   : PCefString;
                                                        callback : PCefAuthCallback): Integer; stdcall;
var
  TempObject : TObject;
begin
  Result     := Ord(False);
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := Ord(TCefRequestHandlerOwn(TempObject).GetAuthCredentials(TCefBrowserRef.UnWrap(browser),
                                                                       TCefFrameRef.UnWrap(frame),
                                                                       isProxy <> 0,
                                                                       CefString(host),
                                                                       port,
                                                                       CefString(realm),
                                                                       CefString(scheme),
                                                                       TCefAuthCallbackRef.UnWrap(callback)));
end;

function cef_request_handler_can_get_cookies(self    : PCefRequestHandler;
                                             browser : PCefBrowser;
                                             frame   : PCefFrame;
                                             request : PCefRequest): Integer; stdcall;
var
  TempObject : TObject;
begin
  Result     := Ord(True);
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := Ord(TCefRequestHandlerOwn(TempObject).CanGetCookies(TCefBrowserRef.UnWrap(browser),
                                                                  TCefFrameRef.UnWrap(frame),
                                                                  TCefRequestRef.UnWrap(request)));
end;

function cef_request_handler_can_set_cookie(      self    : PCefRequestHandler;
                                                  browser : PCefBrowser;
                                                  frame   : PCefFrame;
                                                  request : PCefRequest;
                                            const cookie  : PCefCookie): Integer; stdcall;
var
  TempObject : TObject;
begin
  Result     := Ord(True);
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := Ord(TCefRequestHandlerOwn(TempObject).CanSetCookie(TCefBrowserRef.UnWrap(browser),
                                                                 TCefFrameRef.UnWrap(frame),
                                                                 TCefRequestRef.UnWrap(request),
                                                                 cookie));
end;

function cef_request_handler_on_quota_request(      self       : PCefRequestHandler;
                                                    browser    : PCefBrowser;
                                              const origin_url : PCefString;
                                                    new_size   : Int64;
                                                    callback   : PCefRequestCallback): Integer; stdcall;
var
  TempObject : TObject;
begin
  Result     := Ord(False);
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := Ord(TCefRequestHandlerOwn(TempObject).OnQuotaRequest(TCefBrowserRef.UnWrap(browser),
                                                                   CefString(origin_url),
                                                                   new_size,
                                                                   TCefRequestCallbackRef.UnWrap(callback)));
end;

procedure cef_request_handler_on_protocol_execution(      self               : PCefRequestHandler;
                                                          browser            : PCefBrowser;
                                                    const url                : PCefString;
                                                          allow_os_execution : PInteger); stdcall;
var
  allow : Boolean;
  TempObject : TObject;
begin
  allow      := allow_os_execution^ <> 0;
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    TCefRequestHandlerOwn(TempObject).OnProtocolExecution(TCefBrowserRef.UnWrap(browser),
                                                          CefString(url),
                                                          allow);

  allow_os_execution^ := Ord(allow);
end;

function cef_request_handler_on_certificate_error(      self        : PCefRequestHandler;
                                                        browser     : PCefBrowser;
                                                        cert_error  : TCefErrorcode;
                                                  const request_url : PCefString;
                                                        ssl_info    : PCefSslInfo;
                                                        callback    : PCefRequestCallback): Integer; stdcall;
var
  TempObject : TObject;
begin
  Result     := Ord(False);
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    Result := Ord(TCefRequestHandlerOwn(TempObject).OnCertificateError(TCefBrowserRef.UnWrap(browser),
                                                                       cert_error,
                                                                       CefString(request_url),
                                                                       TCefSslInfoRef.UnWrap(ssl_info),
                                                                       TCefRequestCallbackRef.UnWrap(callback)));
end;

procedure cef_request_handler_on_plugin_crashed(      self        : PCefRequestHandler;
                                                      browser     : PCefBrowser;
                                                const plugin_path : PCefString); stdcall;
var
  TempObject : TObject;
begin
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    TCefRequestHandlerOwn(TempObject).OnPluginCrashed(TCefBrowserRef.UnWrap(browser),
                                                      CefString(plugin_path));
end;

procedure cef_request_handler_on_render_view_ready(self    : PCefRequestHandler;
                                                   browser : PCefBrowser); stdcall;
var
  TempObject : TObject;
begin
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    TCefRequestHandlerOwn(TempObject).OnRenderViewReady(TCefBrowserRef.UnWrap(browser));
end;

procedure cef_request_handler_on_render_process_terminated(self    : PCefRequestHandler;
                                                           browser : PCefBrowser;
                                                           status  : TCefTerminationStatus); stdcall;
var
  TempObject : TObject;
begin
  TempObject := CefGetObject(self);

  if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
    TCefRequestHandlerOwn(TempObject).OnRenderProcessTerminated(TCefBrowserRef.UnWrap(browser),
                                                                status);
end;

function cef_request_handler_on_select_client_certificate(      self              : PCefRequestHandler;
                                                                browser           : PCefBrowser;
                                                                isProxy           : integer;
                                                          const host              : PCefString;
                                                                port              : integer;
                                                                certificatesCount : NativeUInt;
                                                          const certificates      : PPCefX509Certificate;
                                                                callback          : PCefSelectClientCertificateCallback): integer; stdcall;
var
  TempCertArray : TCefX509CertificateArray;
  i : NativeUInt;
  TempObject : TObject;
begin
  TempCertArray := nil;
  Result        := Ord(False);

  try
    try
      if (certificatesCount > 0) and (certificates <> nil) then
        begin
          SetLength(TempCertArray, certificatesCount);

          i := 0;
          while (i < certificatesCount) do
            begin
              TempCertArray[i] := TCEFX509CertificateRef.UnWrap(PPointerArray(certificates)[i]);
              inc(i);
            end;

          TempObject := CefGetObject(self);

          if (TempObject <> nil) and (TempObject is TCefRequestHandlerOwn) then
            Result := Ord(TCefRequestHandlerOwn(TempObject).OnSelectClientCertificate(TCefBrowserRef.UnWrap(browser),
                                                                                      (isProxy <> 0),
                                                                                      CefString(host),
                                                                                      port,
                                                                                      certificatesCount,
                                                                                      TempCertArray,
                                                                                      TCefSelectClientCertificateCallbackRef.UnWrap(callback)));

          i := 0;
          while (i < certificatesCount) do
            begin
              TempCertArray[i] := nil;
              inc(i);
            end;
        end;
    except
      on e : exception do
        if CustomExceptionHandler('uCEFRequestHandler.cef_request_handler_on_select_client_certificate', e) then raise;
    end;
  finally
    if (TempCertArray <> nil) then
      begin
        Finalize(TempCertArray);
        TempCertArray := nil;
      end;
  end;
end;

constructor TCefRequestHandlerOwn.Create;
begin
  inherited CreateData(SizeOf(TCefRequestHandler));

  with PCefRequestHandler(FData)^ do
    begin
      on_before_browse              := cef_request_handler_on_before_browse;
      on_open_urlfrom_tab           := cef_request_handler_on_open_urlfrom_tab;
      on_before_resource_load       := cef_request_handler_on_before_resource_load;
      get_resource_handler          := cef_request_handler_get_resource_handler;
      on_resource_redirect          := cef_request_handler_on_resource_redirect;
      on_resource_response          := cef_request_handler_on_resource_response;
      get_resource_response_filter  := cef_request_handler_get_resource_response_filter;
      on_resource_load_complete     := cef_request_handler_on_resource_load_complete;
      get_auth_credentials          := cef_request_handler_get_auth_credentials;
      can_get_cookies               := cef_request_handler_can_get_cookies;
      can_set_cookie                := cef_request_handler_can_set_cookie;
      on_quota_request              := cef_request_handler_on_quota_request;
      on_protocol_execution         := cef_request_handler_on_protocol_execution;
      on_certificate_error          := cef_request_handler_on_certificate_error;
      on_select_client_certificate  := cef_request_handler_on_select_client_certificate;
      on_plugin_crashed             := cef_request_handler_on_plugin_crashed;
      on_render_view_ready          := cef_request_handler_on_render_view_ready;
      on_render_process_terminated  := cef_request_handler_on_render_process_terminated;
    end;
end;

function TCefRequestHandlerOwn.GetAuthCredentials(const browser  : ICefBrowser;
                                                  const frame    : ICefFrame;
                                                        isProxy  : Boolean;
                                                  const host     : ustring;
                                                        port     : Integer;
                                                  const realm    : ustring;
                                                  const scheme   : ustring;
                                                  const callback : ICefAuthCallback): Boolean;
begin
  Result := False;
end;

function TCefRequestHandlerOwn.CanGetCookies(const browser : ICefBrowser;
                                             const frame   : ICefFrame;
                                             const request : ICefRequest): boolean;
begin
  Result := True;
end;

function TCefRequestHandlerOwn.CanSetCookie(const browser : ICefBrowser;
                                            const frame   : ICefFrame;
                                            const request : ICefRequest;
                                            const cookie  : PCefCookie): boolean;
begin
  Result := True;
end;

function TCefRequestHandlerOwn.GetCookieManager(const browser : ICefBrowser;
                                                const mainUrl : ustring): ICefCookieManager;
begin
  Result := nil;
end;

function TCefRequestHandlerOwn.OnBeforeBrowse(const browser      : ICefBrowser;
                                              const frame        : ICefFrame;
                                              const request      : ICefRequest;
                                                    user_gesture : Boolean;
                                                    isRedirect   : Boolean): Boolean;
begin
  Result := False;
end;

function TCefRequestHandlerOwn.OnBeforeResourceLoad(const browser  : ICefBrowser;
                                                    const frame    : ICefFrame;
                                                    const request  : ICefRequest;
                                                    const callback : ICefRequestCallback): TCefReturnValue;
begin
  Result := RV_CONTINUE;
end;

function TCefRequestHandlerOwn.OnCertificateError(const browser    : ICefBrowser;
                                                        certError  : TCefErrorcode;
                                                  const requestUrl : ustring;
                                                  const sslInfo    : ICefSslInfo;
                                                  const callback   : ICefRequestCallback): Boolean;
begin
  Result := False;
end;

function TCefRequestHandlerOwn.OnSelectClientCertificate(const browser           : ICefBrowser;
                                                               isProxy           : boolean;
                                                         const host              : ustring;
                                                               port              : integer;
                                                               certificatesCount : NativeUInt;
                                                         const certificates      : TCefX509CertificateArray;
                                                         const callback          : ICefSelectClientCertificateCallback): boolean;
begin
  Result := False;
end;

function TCefRequestHandlerOwn.OnOpenUrlFromTab(const browser           : ICefBrowser;
                                                const frame             : ICefFrame;
                                                const targetUrl         : ustring;
                                                      targetDisposition : TCefWindowOpenDisposition;
                                                      userGesture       : Boolean): Boolean;
begin
  Result := False;
end;

function TCefRequestHandlerOwn.GetResourceHandler(const browser : ICefBrowser;
                                                  const frame   : ICefFrame;
                                                  const request : ICefRequest): ICefResourceHandler;
begin
  Result := nil;
end;

procedure TCefRequestHandlerOwn.OnPluginCrashed(const browser    : ICefBrowser;
                                                const pluginPath : ustring);
begin
  //
end;

procedure TCefRequestHandlerOwn.OnProtocolExecution(const browser          : ICefBrowser;
                                                    const url              : ustring;
                                                    out   allowOsExecution : Boolean);
begin
  //
end;

function TCefRequestHandlerOwn.OnQuotaRequest(const browser   : ICefBrowser;
                                              const originUrl : ustring;
                                                    newSize   : Int64;
                                              const callback  : ICefRequestCallback): Boolean;
begin
  Result := False;
end;

procedure TCefRequestHandlerOwn.OnRenderProcessTerminated(const browser : ICefBrowser;
                                                                status  : TCefTerminationStatus);
begin
  //
end;

procedure TCefRequestHandlerOwn.OnRenderViewReady(const browser: ICefBrowser);
begin
  //
end;

procedure TCefRequestHandlerOwn.OnResourceRedirect(const browser  : ICefBrowser;
                                                   const frame    : ICefFrame;
                                                   const request  : ICefRequest;
                                                   const response : ICefResponse;
                                                   var   newUrl   : ustring);
begin
  //
end;

function TCefRequestHandlerOwn.OnResourceResponse(const browser  : ICefBrowser;
                                                  const frame    : ICefFrame;
                                                  const request  : ICefRequest;
                                                  const response : ICefResponse): Boolean;
begin
  Result := False;
end;

function TCefRequestHandlerOwn.GetResourceResponseFilter(const browser  : ICefBrowser;
                                                         const frame    : ICefFrame;
                                                         const request  : ICefRequest;
                                                         const response : ICefResponse): ICefResponseFilter;
begin
  Result := nil;
end;

procedure TCefRequestHandlerOwn.OnResourceLoadComplete(const browser               : ICefBrowser;
                                                       const frame                 : ICefFrame;
                                                       const request               : ICefRequest;
                                                       const response              : ICefResponse;
                                                             status                : TCefUrlRequestStatus;
                                                             receivedContentLength : Int64);
begin
  //
end;

procedure TCefRequestHandlerOwn.RemoveReferences;
begin
  //
end;

// TCustomRequestHandler

constructor TCustomRequestHandler.Create(const events: Pointer);
begin
  inherited Create;

  FEvents := events;
end;

destructor TCustomRequestHandler.Destroy;
begin
  RemoveReferences;

  inherited Destroy;
end;

procedure TCustomRequestHandler.RemoveReferences;
begin
  FEvents := nil;
end;

function TCustomRequestHandler.GetAuthCredentials(const browser  : ICefBrowser;
                                                  const frame    : ICefFrame;
                                                        isProxy  : Boolean;
                                                  const host     : ustring;
                                                        port     : Integer;
                                                  const realm    : ustring;
                                                  const scheme   : ustring;
                                                  const callback : ICefAuthCallback): Boolean;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnGetAuthCredentials(browser, frame, isProxy, host, port, realm, scheme, callback)
   else
    Result := inherited GetAuthCredentials(browser, frame, isProxy, host, port, realm, scheme, callback);
end;

function TCustomRequestHandler.CanGetCookies(const browser : ICefBrowser;
                                             const frame   : ICefFrame;
                                             const request : ICefRequest): boolean;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doCanGetCookies(browser, frame, request)
   else
    Result := inherited CanGetCookies(browser, frame, request);
end;

function TCustomRequestHandler.CanSetCookie(const browser : ICefBrowser;
                                            const frame   : ICefFrame;
                                            const request : ICefRequest;
                                            const cookie  : PCefCookie): boolean;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doCanSetCookie(browser, frame, request, cookie)
   else
    Result := inherited CanSetCookie(browser, frame, request, cookie);
end;

function TCustomRequestHandler.GetResourceHandler(const browser : ICefBrowser;
                                                  const frame   : ICefFrame;
                                                  const request : ICefRequest): ICefResourceHandler;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnGetResourceHandler(browser, frame, request)
   else
    Result := inherited GetResourceHandler(browser, frame, request);
end;

function TCustomRequestHandler.OnBeforeBrowse(const browser      : ICefBrowser;
                                              const frame        : ICefFrame;
                                              const request      : ICefRequest;
                                                    user_gesture : Boolean;
                                                    isRedirect   : Boolean): Boolean;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnBeforeBrowse(browser, frame, request, user_gesture, isRedirect)
   else
    Result := inherited OnBeforeBrowse(browser, frame, request, user_gesture, isRedirect);
end;

function TCustomRequestHandler.OnBeforeResourceLoad(const browser  : ICefBrowser;
                                                    const frame    : ICefFrame;
                                                    const request  : ICefRequest;
                                                    const callback : ICefRequestCallback): TCefReturnValue;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnBeforeResourceLoad(browser, frame, request, callback)
   else
    Result := inherited OnBeforeResourceLoad(browser, frame, request, callback);
end;

function TCustomRequestHandler.OnCertificateError(const browser    : ICefBrowser;
                                                        certError  : TCefErrorcode;
                                                  const requestUrl : ustring;
                                                  const sslInfo    : ICefSslInfo;
                                                  const callback   : ICefRequestCallback): Boolean;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnCertificateError(browser, certError, requestUrl, sslInfo, callback)
   else
    Result := inherited OnCertificateError(browser, certError, requestUrl, sslInfo, callback);
end;

function TCustomRequestHandler.OnOpenUrlFromTab(const browser           : ICefBrowser;
                                                const frame             : ICefFrame;
                                                const targetUrl         : ustring;
                                                      targetDisposition : TCefWindowOpenDisposition;
                                                      userGesture       : Boolean): Boolean;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnOpenUrlFromTab(browser, frame, targetUrl, targetDisposition, userGesture)
   else
    Result := inherited OnOpenUrlFromTab(browser, frame, targetUrl, targetDisposition, userGesture);
end;

function TCustomRequestHandler.OnSelectClientCertificate(const browser           : ICefBrowser;
                                                               isProxy           : boolean;
                                                         const host              : ustring;
                                                               port              : integer;
                                                               certificatesCount : NativeUInt;
                                                         const certificates      : TCefX509CertificateArray;
                                                         const callback          : ICefSelectClientCertificateCallback): boolean;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnSelectClientCertificate(browser, isProxy, host, port, certificatesCount, certificates, callback)
   else
    Result := inherited OnSelectClientCertificate(browser, isProxy, host, port, certificatesCount, certificates, callback);
end;

procedure TCustomRequestHandler.OnPluginCrashed(const browser: ICefBrowser; const pluginPath: ustring);
begin
  if (FEvents <> nil) then IChromiumEvents(FEvents).doOnPluginCrashed(browser, pluginPath);
end;

procedure TCustomRequestHandler.OnProtocolExecution(const browser          : ICefBrowser;
                                                    const url              : ustring;
                                                      out allowOsExecution : Boolean);
begin
  if (FEvents <> nil) then IChromiumEvents(FEvents).doOnProtocolExecution(browser, url, allowOsExecution);
end;

function TCustomRequestHandler.OnQuotaRequest(const browser   : ICefBrowser;
                                              const originUrl : ustring;
                                                    newSize   : Int64;
                                              const callback  : ICefRequestCallback): Boolean;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnQuotaRequest(browser, originUrl, newSize, callback)
   else
    Result := inherited OnQuotaRequest(browser, originUrl, newSize, callback);
end;

procedure TCustomRequestHandler.OnRenderProcessTerminated(const browser: ICefBrowser; status: TCefTerminationStatus);
begin
  if (FEvents <> nil) then IChromiumEvents(FEvents).doOnRenderProcessTerminated(browser, status);
end;

procedure TCustomRequestHandler.OnRenderViewReady(const browser: ICefBrowser);
begin
  if (FEvents <> nil) then IChromiumEvents(FEvents).doOnRenderViewReady(browser);
end;

procedure TCustomRequestHandler.OnResourceRedirect(const browser  : ICefBrowser;
                                                   const frame    : ICefFrame;
                                                   const request  : ICefRequest;
                                                   const response : ICefResponse;
                                                   var   newUrl   : ustring);
begin
  if (FEvents <> nil) then IChromiumEvents(FEvents).doOnResourceRedirect(browser, frame, request, response, newUrl);
end;

function TCustomRequestHandler.OnResourceResponse(const browser  : ICefBrowser;
                                                  const frame    : ICefFrame;
                                                  const request  : ICefRequest;
                                                  const response : ICefResponse): Boolean;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnResourceResponse(browser, frame, request, response)
   else
    Result := inherited OnResourceResponse(browser, frame, request, response);
end;

function TCustomRequestHandler.GetResourceResponseFilter(const browser  : ICefBrowser;
                                                         const frame    : ICefFrame;
                                                         const request  : ICefRequest;
                                                         const response : ICefResponse): ICefResponseFilter;
begin
  if (FEvents <> nil) then
    Result := IChromiumEvents(FEvents).doOnGetResourceResponseFilter(browser, frame, request, response)
   else
    Result := inherited GetResourceResponseFilter(browser, frame, request, response);
end;

procedure TCustomRequestHandler.OnResourceLoadComplete(const browser               : ICefBrowser;
                                                       const frame                 : ICefFrame;
                                                       const request               : ICefRequest;
                                                       const response              : ICefResponse;
                                                             status                : TCefUrlRequestStatus;
                                                             receivedContentLength : Int64);
begin
  if (FEvents <> nil) then
    IChromiumEvents(FEvents).doOnResourceLoadComplete(browser, frame, request, response, status, receivedContentLength);
end;

end.