src/include/cef_resource_request_handler.h

// Copyright (c) 2011 Marshall A. Greenblatt. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the name Chromium Embedded
// Framework nor the names of its contributors may be used to endorse
// or promote products derived from this software without specific prior
// written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// ---------------------------------------------------------------------------
//
// The contents of this file must follow a specific format in order to
// support the CEF translator tool. See the translator.README.txt file in the
// tools directory for more information.
//

#ifndef CEF_INCLUDE_CEF_RESOURCE_REQUEST_HANDLER_H_
#define CEF_INCLUDE_CEF_RESOURCE_REQUEST_HANDLER_H_
#pragma once

#include "include/cef_base.h"
#include "include/cef_browser.h"
#include "include/cef_frame.h"
#include "include/cef_request.h"
#include "include/cef_request_callback.h"
#include "include/cef_resource_handler.h"
#include "include/cef_response.h"
#include "include/cef_response_filter.h"

class CefCookieAccessFilter;

///
// Implement this interface to handle events related to browser requests. The
// methods of this class will be called on the IO thread unless otherwise
// indicated.
///
/*--cef(source=client,no_debugct_check)--*/
class CefResourceRequestHandler : public virtual CefBaseRefCounted {
 public:
  typedef cef_return_value_t ReturnValue;
  typedef cef_urlrequest_status_t URLRequestStatus;

  ///
  // Called on the IO thread before a resource request is loaded. The |browser|
  // and |frame| values represent the source of the request, and may be NULL for
  // requests originating from service workers or CefURLRequest. To optionally
  // filter cookies for the request return a CefCookieAccessFilter object. The
  // |request| object cannot not be modified in this callback.
  ///
  /*--cef(optional_param=browser,optional_param=frame)--*/
  virtual CefRefPtr<CefCookieAccessFilter> GetCookieAccessFilter(
      CefRefPtr<CefBrowser> browser,
      CefRefPtr<CefFrame> frame,
      CefRefPtr<CefRequest> request) {
    return nullptr;
  }

  ///
  // Called on the IO thread before a resource request is loaded. The |browser|
  // and |frame| values represent the source of the request, and may be NULL for
  // requests originating from service workers or CefURLRequest. To redirect or
  // change the resource load optionally modify |request|. Modification of the
  // request URL will be treated as a redirect. Return RV_CONTINUE to continue
  // the request immediately. Return RV_CONTINUE_ASYNC and call
  // CefRequestCallback:: Continue() at a later time to continue or cancel the
  // request asynchronously. Return RV_CANCEL to cancel the request immediately.
  //
  ///
  /*--cef(optional_param=browser,optional_param=frame,
          default_retval=RV_CONTINUE)--*/
  virtual ReturnValue OnBeforeResourceLoad(
      CefRefPtr<CefBrowser> browser,
      CefRefPtr<CefFrame> frame,
      CefRefPtr<CefRequest> request,
      CefRefPtr<CefRequestCallback> callback) {
    return RV_CONTINUE;
  }

  ///
  // Called on the IO thread before a resource is loaded. The |browser| and
  // |frame| values represent the source of the request, and may be NULL for
  // requests originating from service workers or CefURLRequest. To allow the
  // resource to load using the default network loader return NULL. To specify a
  // handler for the resource return a CefResourceHandler object. The |request|
  // object cannot not be modified in this callback.
  ///
  /*--cef(optional_param=browser,optional_param=frame)--*/
  virtual CefRefPtr<CefResourceHandler> GetResourceHandler(
      CefRefPtr<CefBrowser> browser,
      CefRefPtr<CefFrame> frame,
      CefRefPtr<CefRequest> request) {
    return nullptr;
  }

  ///
  // Called on the IO thread when a resource load is redirected. The |browser|
  // and |frame| values represent the source of the request, and may be NULL for
  // requests originating from service workers or CefURLRequest. The |request|
  // parameter will contain the old URL and other request-related information.
  // The |response| parameter will contain the response that resulted in the
  // redirect. The |new_url| parameter will contain the new URL and can be
  // changed if desired. The |request| and |response| objects cannot be modified
  // in this callback.
  ///
  /*--cef(optional_param=browser,optional_param=frame)--*/
  virtual void OnResourceRedirect(CefRefPtr<CefBrowser> browser,
                                  CefRefPtr<CefFrame> frame,
                                  CefRefPtr<CefRequest> request,
                                  CefRefPtr<CefResponse> response,
                                  CefString& new_url) {}

  ///
  // Called on the IO thread when a resource response is received. The |browser|
  // and |frame| values represent the source of the request, and may be NULL for
  // requests originating from service workers or CefURLRequest. To allow the
  // resource load to proceed without modification return false. To redirect or
  // retry the resource load optionally modify |request| and return true.
  // Modification of the request URL will be treated as a redirect. Requests
  // handled using the default network loader cannot be redirected in this
  // callback. The |response| object cannot be modified in this callback.
  //
  // WARNING: Redirecting using this method is deprecated. Use
  // OnBeforeResourceLoad or GetResourceHandler to perform redirects.
  ///
  /*--cef(optional_param=browser,optional_param=frame)--*/
  virtual bool OnResourceResponse(CefRefPtr<CefBrowser> browser,
                                  CefRefPtr<CefFrame> frame,
                                  CefRefPtr<CefRequest> request,
                                  CefRefPtr<CefResponse> response) {
    return false;
  }

  ///
  // Called on the IO thread to optionally filter resource response content. The
  // |browser| and |frame| values represent the source of the request, and may
  // be NULL for requests originating from service workers or CefURLRequest.
  // |request| and |response| represent the request and response respectively
  // and cannot be modified in this callback.
  ///
  /*--cef(optional_param=browser,optional_param=frame)--*/
  virtual CefRefPtr<CefResponseFilter> GetResourceResponseFilter(
      CefRefPtr<CefBrowser> browser,
      CefRefPtr<CefFrame> frame,
      CefRefPtr<CefRequest> request,
      CefRefPtr<CefResponse> response) {
    return nullptr;
  }

  ///
  // Called on the IO thread when a resource load has completed. The |browser|
  // and |frame| values represent the source of the request, and may be NULL for
  // requests originating from service workers or CefURLRequest. |request| and
  // |response| represent the request and response respectively and cannot be
  // modified in this callback. |status| indicates the load completion status.
  // |received_content_length| is the number of response bytes actually read.
  // This method will be called for all requests, including requests that are
  // aborted due to CEF shutdown or destruction of the associated browser. In
  // cases where the associated browser is destroyed this callback may arrive
  // after the CefLifeSpanHandler::OnBeforeClose callback for that browser. The
  // CefFrame::IsValid method can be used to test for this situation, and care
  // should be taken not to call |browser| or |frame| methods that modify state
  // (like LoadURL, SendProcessMessage, etc.) if the frame is invalid.
  ///
  /*--cef(optional_param=browser,optional_param=frame)--*/
  virtual void OnResourceLoadComplete(CefRefPtr<CefBrowser> browser,
                                      CefRefPtr<CefFrame> frame,
                                      CefRefPtr<CefRequest> request,
                                      CefRefPtr<CefResponse> response,
                                      URLRequestStatus status,
                                      int64 received_content_length) {}

  ///
  // Called on the IO thread to handle requests for URLs with an unknown
  // protocol component. The |browser| and |frame| values represent the source
  // of the request, and may be NULL for requests originating from service
  // workers or CefURLRequest. |request| cannot be modified in this callback.
  // Set |allow_os_execution| to true to attempt execution via the registered OS
  // protocol handler, if any.
  // SECURITY WARNING: YOU SHOULD USE THIS METHOD TO ENFORCE RESTRICTIONS BASED
  // ON SCHEME, HOST OR OTHER URL ANALYSIS BEFORE ALLOWING OS EXECUTION.
  ///
  /*--cef(optional_param=browser,optional_param=frame)--*/
  virtual void OnProtocolExecution(CefRefPtr<CefBrowser> browser,
                                   CefRefPtr<CefFrame> frame,
                                   CefRefPtr<CefRequest> request,
                                   bool& allow_os_execution) {}
};

///
// Implement this interface to filter cookies that may be sent or received from
// resource requests. The methods of this class will be called on the IO thread
// unless otherwise indicated.
///
/*--cef(source=client,no_debugct_check)--*/
class CefCookieAccessFilter : public virtual CefBaseRefCounted {
 public:
  ///
  // Called on the IO thread before a resource request is sent. The |browser|
  // and |frame| values represent the source of the request, and may be NULL for
  // requests originating from service workers or CefURLRequest. |request|
  // cannot be modified in this callback. Return true if the specified cookie
  // can be sent with the request or false otherwise.
  ///
  /*--cef(optional_param=browser,optional_param=frame)--*/
  virtual bool CanSendCookie(CefRefPtr<CefBrowser> browser,
                             CefRefPtr<CefFrame> frame,
                             CefRefPtr<CefRequest> request,
                             const CefCookie& cookie) {
    return true;
  }

  ///
  // Called on the IO thread after a resource response is received. The
  // |browser| and |frame| values represent the source of the request, and may
  // be NULL for requests originating from service workers or CefURLRequest.
  // |request| cannot be modified in this callback. Return true if the specified
  // cookie returned with the response can be saved or false otherwise.
  ///
  /*--cef(optional_param=browser,optional_param=frame)--*/
  virtual bool CanSaveCookie(CefRefPtr<CefBrowser> browser,
                             CefRefPtr<CefFrame> frame,
                             CefRefPtr<CefRequest> request,
                             CefRefPtr<CefResponse> response,
                             const CefCookie& cookie) {
    return true;
  }
};

#endif  // CEF_INCLUDE_CEF_RESOURCE_REQUEST_HANDLER_H_