cef/include/cef_resource_handler.h

207 lines
8.8 KiB
C++

// Copyright (c) 2012 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_HANDLER_H_
#define CEF_INCLUDE_CEF_RESOURCE_HANDLER_H_
#pragma once
#include "include/cef_base.h"
#include "include/cef_browser.h"
#include "include/cef_callback.h"
#include "include/cef_cookie.h"
#include "include/cef_request.h"
#include "include/cef_response.h"
///
/// Callback for asynchronous continuation of CefResourceHandler::Skip().
///
/*--cef(source=library)--*/
class CefResourceSkipCallback : public virtual CefBaseRefCounted {
public:
///
/// Callback for asynchronous continuation of Skip(). If |bytes_skipped| > 0
/// then either Skip() will be called again until the requested number of
/// bytes have been skipped or the request will proceed. If |bytes_skipped|
/// <= 0 the request will fail with ERR_REQUEST_RANGE_NOT_SATISFIABLE.
///
/*--cef(capi_name=cont)--*/
virtual void Continue(int64_t bytes_skipped) = 0;
};
///
/// Callback for asynchronous continuation of CefResourceHandler::Read().
///
/*--cef(source=library)--*/
class CefResourceReadCallback : public virtual CefBaseRefCounted {
public:
///
/// Callback for asynchronous continuation of Read(). If |bytes_read| == 0
/// the response will be considered complete. If |bytes_read| > 0 then Read()
/// will be called again until the request is complete (based on either the
/// result or the expected content length). If |bytes_read| < 0 then the
/// request will fail and the |bytes_read| value will be treated as the error
/// code.
///
/*--cef(capi_name=cont)--*/
virtual void Continue(int bytes_read) = 0;
};
///
/// Class used to implement a custom request handler interface. The methods of
/// this class will be called on the IO thread unless otherwise indicated.
///
/*--cef(source=client)--*/
class CefResourceHandler : public virtual CefBaseRefCounted {
public:
///
/// Open the response stream. To handle the request immediately set
/// |handle_request| to true and return true. To decide at a later time set
/// |handle_request| to false, return true, and execute |callback| to continue
/// or cancel the request. To cancel the request immediately set
/// |handle_request| to true and return false. This method will be called in
/// sequence but not from a dedicated thread. For backwards compatibility set
/// |handle_request| to false and return false and the ProcessRequest method
/// will be called.
///
/*--cef()--*/
virtual bool Open(CefRefPtr<CefRequest> request,
bool& handle_request,
CefRefPtr<CefCallback> callback) {
handle_request = false;
return false;
}
///
/// Begin processing the request. To handle the request return true and call
/// CefCallback::Continue() once the response header information is available
/// (CefCallback::Continue() can also be called from inside this method if
/// header information is available immediately). To cancel the request return
/// false.
///
/// WARNING: This method is deprecated. Use Open instead.
///
/*--cef()--*/
virtual bool ProcessRequest(CefRefPtr<CefRequest> request,
CefRefPtr<CefCallback> callback) {
return false;
}
///
/// Retrieve response header information. If the response length is not known
/// set |response_length| to -1 and ReadResponse() will be called until it
/// returns false. If the response length is known set |response_length|
/// to a positive value and ReadResponse() will be called until it returns
/// false or the specified number of bytes have been read. Use the |response|
/// object to set the mime type, http status code and other optional header
/// values. To redirect the request to a new URL set |redirectUrl| to the new
/// URL. |redirectUrl| can be either a relative or fully qualified URL.
/// It is also possible to set |response| to a redirect http status code
/// and pass the new URL via a Location header. Likewise with |redirectUrl| it
/// is valid to set a relative or fully qualified URL as the Location header
/// value. If an error occured while setting up the request you can call
/// SetError() on |response| to indicate the error condition.
///
/*--cef()--*/
virtual void GetResponseHeaders(CefRefPtr<CefResponse> response,
int64_t& response_length,
CefString& redirectUrl) = 0;
///
/// Skip response data when requested by a Range header. Skip over and discard
/// |bytes_to_skip| bytes of response data. If data is available immediately
/// set |bytes_skipped| to the number of bytes skipped and return true. To
/// read the data at a later time set |bytes_skipped| to 0, return true and
/// execute |callback| when the data is available. To indicate failure set
/// |bytes_skipped| to < 0 (e.g. -2 for ERR_FAILED) and return false. This
/// method will be called in sequence but not from a dedicated thread.
///
/*--cef()--*/
virtual bool Skip(int64_t bytes_to_skip,
int64_t& bytes_skipped,
CefRefPtr<CefResourceSkipCallback> callback) {
bytes_skipped = -2;
return false;
}
///
/// Read response data. If data is available immediately copy up to
/// |bytes_to_read| bytes into |data_out|, set |bytes_read| to the number of
/// bytes copied, and return true. To read the data at a later time keep a
/// pointer to |data_out|, set |bytes_read| to 0, return true and execute
/// |callback| when the data is available (|data_out| will remain valid until
/// the callback is executed). To indicate response completion set
/// |bytes_read| to 0 and return false. To indicate failure set |bytes_read|
/// to < 0 (e.g. -2 for ERR_FAILED) and return false. This method will be
/// called in sequence but not from a dedicated thread. For backwards
/// compatibility set |bytes_read| to -1 and return false and the ReadResponse
/// method will be called.
///
/*--cef()--*/
virtual bool Read(void* data_out,
int bytes_to_read,
int& bytes_read,
CefRefPtr<CefResourceReadCallback> callback) {
bytes_read = -1;
return false;
}
///
/// Read response data. If data is available immediately copy up to
/// |bytes_to_read| bytes into |data_out|, set |bytes_read| to the number of
/// bytes copied, and return true. To read the data at a later time set
/// |bytes_read| to 0, return true and call CefCallback::Continue() when the
/// data is available. To indicate response completion return false.
///
/// WARNING: This method is deprecated. Use Skip and Read instead.
///
/*--cef()--*/
virtual bool ReadResponse(void* data_out,
int bytes_to_read,
int& bytes_read,
CefRefPtr<CefCallback> callback) {
bytes_read = -2;
return false;
}
///
/// Request processing has been canceled.
///
/*--cef()--*/
virtual void Cancel() = 0;
};
#endif // CEF_INCLUDE_CEF_RESOURCE_HANDLER_H_