cef/libcef/browser/net_service/resource_handler_wrapper.cc

524 lines
15 KiB
C++

// Copyright (c) 2019 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.
#include "libcef/browser/net_service/resource_handler_wrapper.h"
#include "libcef/browser/net_service/proxy_url_loader_factory.h"
#include "libcef/browser/thread_util.h"
#include "libcef/common/net_service/net_service_util.h"
#include "libcef/common/request_impl.h"
#include "base/strings/string_number_conversions.h"
#include "net/http/http_status_code.h"
namespace net_service {
namespace {
class SkipCallbackWrapper : public CefResourceSkipCallback {
public:
explicit SkipCallbackWrapper(InputStream::SkipCallback callback)
: callback_(std::move(callback)),
work_thread_task_runner_(
base::SequencedTaskRunner::GetCurrentDefault()) {}
SkipCallbackWrapper(const SkipCallbackWrapper&) = delete;
SkipCallbackWrapper& operator=(const SkipCallbackWrapper&) = delete;
~SkipCallbackWrapper() override {
if (!callback_.is_null()) {
// Make sure it executes on the correct thread.
work_thread_task_runner_->PostTask(
FROM_HERE, base::BindOnce(std::move(callback_), net::ERR_FAILED));
}
}
void Continue(int64 bytes_skipped) override {
if (!work_thread_task_runner_->RunsTasksInCurrentSequence()) {
work_thread_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&SkipCallbackWrapper::Continue, this, bytes_skipped));
return;
}
if (!callback_.is_null()) {
std::move(callback_).Run(bytes_skipped);
}
}
void Disconnect() { callback_.Reset(); }
private:
InputStream::SkipCallback callback_;
scoped_refptr<base::SequencedTaskRunner> work_thread_task_runner_;
IMPLEMENT_REFCOUNTING(SkipCallbackWrapper);
};
class ReadCallbackWrapper : public CefResourceReadCallback {
public:
explicit ReadCallbackWrapper(InputStream::ReadCallback callback)
: callback_(std::move(callback)),
work_thread_task_runner_(
base::SequencedTaskRunner::GetCurrentDefault()) {}
ReadCallbackWrapper(const ReadCallbackWrapper&) = delete;
ReadCallbackWrapper& operator=(const ReadCallbackWrapper&) = delete;
~ReadCallbackWrapper() override {
if (!callback_.is_null()) {
// Make sure it executes on the correct thread.
work_thread_task_runner_->PostTask(
FROM_HERE, base::BindOnce(std::move(callback_), net::ERR_FAILED));
}
}
void Continue(int bytes_read) override {
if (!work_thread_task_runner_->RunsTasksInCurrentSequence()) {
work_thread_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&ReadCallbackWrapper::Continue, this, bytes_read));
return;
}
if (!callback_.is_null()) {
std::move(callback_).Run(bytes_read);
}
}
void Disconnect() { callback_.Reset(); }
private:
InputStream::ReadCallback callback_;
scoped_refptr<base::SequencedTaskRunner> work_thread_task_runner_;
IMPLEMENT_REFCOUNTING(ReadCallbackWrapper);
};
// Helper for accessing a CefResourceHandler without creating reference loops.
class HandlerProvider : public base::RefCountedThreadSafe<HandlerProvider> {
public:
explicit HandlerProvider(CefRefPtr<CefResourceHandler> handler)
: handler_(handler) {
DCHECK(handler_);
}
virtual ~HandlerProvider() {
// Detach should have been called.
DCHECK(!handler_);
}
CefRefPtr<CefResourceHandler> handler() const {
base::AutoLock lock_scope(lock_);
return handler_;
}
void Detach() {
base::AutoLock lock_scope(lock_);
if (!handler_) {
return;
}
// Execute on the expected thread.
CEF_POST_TASK(CEF_IOT,
base::BindOnce(&CefResourceHandler::Cancel, handler_));
handler_ = nullptr;
}
private:
mutable base::Lock lock_;
CefRefPtr<CefResourceHandler> handler_;
};
class ReadResponseCallbackWrapper : public CefCallback {
public:
ReadResponseCallbackWrapper(const ReadResponseCallbackWrapper&) = delete;
ReadResponseCallbackWrapper& operator=(const ReadResponseCallbackWrapper&) =
delete;
~ReadResponseCallbackWrapper() override {
if (callback_) {
// This will post to the correct thread if necessary.
callback_->Continue(net::ERR_FAILED);
}
}
void Continue() override {
CEF_POST_TASK(CEF_IOT,
base::BindOnce(&ReadResponseCallbackWrapper::DoRead, this));
}
void Cancel() override {
CEF_POST_TASK(CEF_IOT,
base::BindOnce(&ReadResponseCallbackWrapper::DoCancel, this));
}
static void ReadResponse(scoped_refptr<HandlerProvider> handler_provider,
net::IOBuffer* dest,
int length,
CefRefPtr<ReadCallbackWrapper> callback) {
CEF_POST_TASK(
CEF_IOT,
base::BindOnce(ReadResponseCallbackWrapper::ReadResponseOnIOThread,
handler_provider, base::Unretained(dest), length,
callback));
}
private:
ReadResponseCallbackWrapper(scoped_refptr<HandlerProvider> handler_provider,
net::IOBuffer* dest,
int length,
CefRefPtr<ReadCallbackWrapper> callback)
: handler_provider_(handler_provider),
dest_(dest),
length_(length),
callback_(callback) {}
static void ReadResponseOnIOThread(
scoped_refptr<HandlerProvider> handler_provider,
net::IOBuffer* dest,
int length,
CefRefPtr<ReadCallbackWrapper> callback) {
CEF_REQUIRE_IOT();
CefRefPtr<ReadResponseCallbackWrapper> callbackWrapper =
new ReadResponseCallbackWrapper(handler_provider, dest, length,
callback);
callbackWrapper->DoRead();
}
void DoRead() {
CEF_REQUIRE_IOT();
if (!callback_) {
return;
}
auto handler = handler_provider_->handler();
if (!handler) {
DoCancel();
return;
}
int bytes_read = 0;
bool result =
handler->ReadResponse(dest_->data(), length_, bytes_read, this);
if (result) {
if (bytes_read > 0) {
// Continue immediately.
callback_->Continue(bytes_read);
callback_ = nullptr;
}
return;
}
// Signal response completion immediately.
callback_->Continue(0);
callback_ = nullptr;
}
void DoCancel() {
CEF_REQUIRE_IOT();
if (callback_) {
callback_->Continue(net::ERR_FAILED);
callback_ = nullptr;
}
}
scoped_refptr<HandlerProvider> handler_provider_;
net::IOBuffer* const dest_;
int length_;
CefRefPtr<ReadCallbackWrapper> callback_;
IMPLEMENT_REFCOUNTING(ReadResponseCallbackWrapper);
};
class InputStreamWrapper : public InputStream {
public:
explicit InputStreamWrapper(scoped_refptr<HandlerProvider> handler_provider)
: handler_provider_(handler_provider) {}
InputStreamWrapper(const InputStreamWrapper&) = delete;
InputStreamWrapper& operator=(const InputStreamWrapper&) = delete;
~InputStreamWrapper() override { Cancel(); }
// InputStream methods:
bool Skip(int64_t n, int64_t* bytes_skipped, SkipCallback callback) override {
auto handler = handler_provider_->handler();
if (!handler) {
// Cancel immediately.
*bytes_skipped = net::ERR_FAILED;
return false;
}
CefRefPtr<SkipCallbackWrapper> callbackWrapper =
new SkipCallbackWrapper(std::move(callback));
bool result = handler->Skip(n, *bytes_skipped, callbackWrapper.get());
if (result) {
if (*bytes_skipped > 0) {
// Continue immediately.
callbackWrapper->Disconnect();
}
return true;
}
// Cancel immediately.
return false;
}
bool Read(net::IOBuffer* dest,
int length,
int* bytes_read,
ReadCallback callback) override {
auto handler = handler_provider_->handler();
if (!handler) {
// Cancel immediately.
*bytes_read = net::ERR_FAILED;
return false;
}
CefRefPtr<ReadCallbackWrapper> callbackWrapper =
new ReadCallbackWrapper(std::move(callback));
bool result =
handler->Read(dest->data(), length, *bytes_read, callbackWrapper.get());
if (result) {
if (*bytes_read > 0) {
// Continue immediately.
callbackWrapper->Disconnect();
}
return true;
}
if (*bytes_read == -1) {
// Call ReadResponse on the IO thread.
ReadResponseCallbackWrapper::ReadResponse(handler_provider_, dest, length,
callbackWrapper);
*bytes_read = 0;
return true;
}
// Complete or cancel immediately.
return false;
}
void Cancel() {
// Triggers a call to Cancel on the handler.
handler_provider_->Detach();
}
private:
scoped_refptr<HandlerProvider> handler_provider_;
};
class OpenCallbackWrapper : public CefCallback {
public:
OpenCallbackWrapper(ResourceResponse::OpenCallback callback,
std::unique_ptr<InputStreamWrapper> stream)
: callback_(std::move(callback)),
stream_(std::move(stream)),
work_thread_task_runner_(
base::SequencedTaskRunner::GetCurrentDefault()) {}
OpenCallbackWrapper(const OpenCallbackWrapper&) = delete;
OpenCallbackWrapper& operator=(const OpenCallbackWrapper&) = delete;
~OpenCallbackWrapper() override {
if (!callback_.is_null()) {
// Make sure it executes on the correct thread.
work_thread_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&OpenCallbackWrapper::Execute, std::move(callback_),
std::move(stream_), false));
}
}
void Continue() override {
if (!work_thread_task_runner_->RunsTasksInCurrentSequence()) {
work_thread_task_runner_->PostTask(
FROM_HERE, base::BindOnce(&OpenCallbackWrapper::Continue, this));
return;
}
if (!callback_.is_null()) {
Execute(std::move(callback_), std::move(stream_), true);
}
}
void Cancel() override {
if (!work_thread_task_runner_->RunsTasksInCurrentSequence()) {
work_thread_task_runner_->PostTask(
FROM_HERE, base::BindOnce(&OpenCallbackWrapper::Cancel, this));
return;
}
if (!callback_.is_null()) {
Execute(std::move(callback_), std::move(stream_), false);
}
}
private:
static void Execute(ResourceResponse::OpenCallback callback,
std::unique_ptr<InputStreamWrapper> stream,
bool cont) {
std::move(callback).Run(cont ? std::move(stream) : nullptr);
}
ResourceResponse::OpenCallback callback_;
std::unique_ptr<InputStreamWrapper> stream_;
scoped_refptr<base::SequencedTaskRunner> work_thread_task_runner_;
IMPLEMENT_REFCOUNTING(OpenCallbackWrapper);
};
void CallProcessRequestOnIOThread(
scoped_refptr<HandlerProvider> handler_provider,
CefRefPtr<CefRequestImpl> request,
CefRefPtr<OpenCallbackWrapper> callbackWrapper) {
CEF_REQUIRE_IOT();
auto handler = handler_provider->handler();
if (!handler) {
callbackWrapper->Cancel();
return;
}
if (!handler->ProcessRequest(request.get(), callbackWrapper.get())) {
callbackWrapper->Cancel();
}
}
class ResourceResponseWrapper : public ResourceResponse {
public:
ResourceResponseWrapper(const int32_t request_id,
CefRefPtr<CefResourceHandler> handler)
: request_id_(request_id),
handler_provider_(new HandlerProvider(handler)) {}
ResourceResponseWrapper(const ResourceResponseWrapper&) = delete;
ResourceResponseWrapper& operator=(const ResourceResponseWrapper&) = delete;
~ResourceResponseWrapper() override {
// Triggers a call to Cancel on the handler.
handler_provider_->Detach();
}
// ResourceResponse methods:
bool OpenInputStream(int32_t request_id,
const network::ResourceRequest& request,
OpenCallback callback) override {
DCHECK_EQ(request_id, request_id_);
auto handler = handler_provider_->handler();
if (!handler) {
// Cancel immediately.
return false;
}
// May be recreated on redirect.
request_ = new CefRequestImpl();
request_->Set(&request, request_id);
request_->SetReadOnly(true);
CefRefPtr<OpenCallbackWrapper> callbackWrapper = new OpenCallbackWrapper(
std::move(callback),
std::make_unique<InputStreamWrapper>(handler_provider_));
bool handle_request = false;
bool result =
handler->Open(request_.get(), handle_request, callbackWrapper.get());
if (result) {
if (handle_request) {
// Continue immediately.
callbackWrapper->Continue();
}
return true;
}
if (handle_request) {
// Cancel immediately.
callbackWrapper->Cancel();
return true;
}
// Call ProcessRequest on the IO thread.
CEF_POST_TASK(
CEF_IOT, base::BindOnce(CallProcessRequestOnIOThread, handler_provider_,
request_, callbackWrapper));
return true;
}
void GetResponseHeaders(int32_t request_id,
int* status_code,
std::string* reason_phrase,
std::string* mime_type,
std::string* charset,
int64_t* content_length,
HeaderMap* extra_headers) override {
DCHECK_EQ(request_id, request_id_);
CEF_REQUIRE_IOT();
auto handler = handler_provider_->handler();
if (!handler) {
// Cancel immediately.
*status_code = net::ERR_FAILED;
return;
}
CefRefPtr<CefResponse> response = CefResponse::Create();
int64_t response_length = -1;
CefString redirect_url;
handler->GetResponseHeaders(response, response_length, redirect_url);
const auto error_code = response->GetError();
if (error_code != ERR_NONE) {
// Early exit if the handler reported an error.
*status_code = error_code;
return;
}
if (!redirect_url.empty()) {
// Perform a redirect.
*status_code = net::HTTP_TEMPORARY_REDIRECT;
*reason_phrase = std::string();
extra_headers->insert(
std::make_pair(kHTTPLocationHeaderName, redirect_url));
} else {
*status_code = response->GetStatus();
*reason_phrase = response->GetStatusText();
}
if (reason_phrase->empty() && *status_code > 0) {
*reason_phrase = net::GetHttpReasonPhrase(
static_cast<net::HttpStatusCode>(*status_code));
}
*mime_type = response->GetMimeType();
*charset = response->GetCharset();
// A |content_length| value may already be specified if the request included
// a Range header.
if (response_length >= 0 && *content_length == -1) {
*content_length = response_length;
}
CefResponse::HeaderMap headerMap;
response->GetHeaderMap(headerMap);
for (const auto& value : headerMap) {
extra_headers->insert(std::make_pair(value.first, value.second));
}
}
private:
const int32_t request_id_;
CefRefPtr<CefRequestImpl> request_;
scoped_refptr<HandlerProvider> handler_provider_;
};
} // namespace
std::unique_ptr<ResourceResponse> CreateResourceResponse(
int32_t request_id,
CefRefPtr<CefResourceHandler> handler) {
return std::make_unique<ResourceResponseWrapper>(request_id, handler);
}
} // namespace net_service