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// Copyright (c) 2012 The Chromium 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 "content/browser/net/view_http_cache_job_factory.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_util.h"
#include "content/public/common/url_constants.h"
#include "net/base/completion_callback.h"
#include "net/base/net_errors.h"
#include "net/url_request/url_request.h"
#include "net/url_request/url_request_simple_job.h"
#include "net/url_request/view_cache_helper.h"
namespace content {
namespace {
// A job subclass that dumps an HTTP cache entry.
class ViewHttpCacheJob : public net::URLRequestJob {
public:
ViewHttpCacheJob(net::URLRequest* request,
net::NetworkDelegate* network_delegate)
: net::URLRequestJob(request, network_delegate),
core_(new Core),
callback_(base::Bind(&ViewHttpCacheJob::OnStartCompleted,
base::Unretained(this))),
weak_factory_(this) {
}
// net::URLRequestJob implementation.
void Start() override;
void Kill() override;
bool GetMimeType(std::string* mime_type) const override {
return core_->GetMimeType(mime_type);
}
bool GetCharset(std::string* charset) override {
return core_->GetCharset(charset);
}
bool ReadRawData(net::IOBuffer* buf, int buf_size, int* bytes_read) override {
return core_->ReadRawData(buf, buf_size, bytes_read);
}
private:
class Core : public base::RefCounted<Core> {
public:
Core()
: data_offset_(0),
callback_(base::Bind(&Core::OnIOComplete, this)) {
}
int Start(const net::URLRequest& request, const base::Closure& callback);
// Prevents it from invoking its callback. It will self-delete.
void Orphan() {
user_callback_.Reset();
}
bool GetMimeType(std::string* mime_type) const;
bool GetCharset(std::string* charset);
bool ReadRawData(net::IOBuffer* buf, int buf_size, int *bytes_read);
private:
friend class base::RefCounted<Core>;
~Core() {}
// Called when ViewCacheHelper completes the operation.
void OnIOComplete(int result);
std::string data_;
int data_offset_;
net::ViewCacheHelper cache_helper_;
net::CompletionCallback callback_;
base::Closure user_callback_;
DISALLOW_COPY_AND_ASSIGN(Core);
};
~ViewHttpCacheJob() override {}
void StartAsync();
void OnStartCompleted();
scoped_refptr<Core> core_;
base::Closure callback_;
base::WeakPtrFactory<ViewHttpCacheJob> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(ViewHttpCacheJob);
};
void ViewHttpCacheJob::Start() {
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&ViewHttpCacheJob::StartAsync, weak_factory_.GetWeakPtr()));
}
void ViewHttpCacheJob::Kill() {
weak_factory_.InvalidateWeakPtrs();
if (core_.get()) {
core_->Orphan();
core_ = NULL;
}
net::URLRequestJob::Kill();
}
void ViewHttpCacheJob::StartAsync() {
DCHECK(request());
if (!request())
return;
int rv = core_->Start(*request(), callback_);
if (rv != net::ERR_IO_PENDING) {
DCHECK_EQ(net::OK, rv);
OnStartCompleted();
}
}
void ViewHttpCacheJob::OnStartCompleted() {
NotifyHeadersComplete();
}
int ViewHttpCacheJob::Core::Start(const net::URLRequest& request,
const base::Closure& callback) {
DCHECK(!callback.is_null());
DCHECK(user_callback_.is_null());
AddRef(); // Released on OnIOComplete().
std::string cache_key =
request.url().spec().substr(strlen(kChromeUINetworkViewCacheURL));
int rv;
if (cache_key.empty()) {
rv = cache_helper_.GetContentsHTML(request.context(),
kChromeUINetworkViewCacheURL,
&data_, callback_);
} else {
rv = cache_helper_.GetEntryInfoHTML(cache_key, request.context(),
&data_, callback_);
}
if (rv == net::ERR_IO_PENDING)
user_callback_ = callback;
return rv;
}
bool ViewHttpCacheJob::Core::GetMimeType(std::string* mime_type) const {
mime_type->assign("text/html");
return true;
}
bool ViewHttpCacheJob::Core::GetCharset(std::string* charset) {
charset->assign("UTF-8");
return true;
}
bool ViewHttpCacheJob::Core::ReadRawData(net::IOBuffer* buf,
int buf_size,
int* bytes_read) {
DCHECK(bytes_read);
int remaining = static_cast<int>(data_.size()) - data_offset_;
if (buf_size > remaining)
buf_size = remaining;
memcpy(buf->data(), data_.data() + data_offset_, buf_size);
data_offset_ += buf_size;
*bytes_read = buf_size;
return true;
}
void ViewHttpCacheJob::Core::OnIOComplete(int result) {
DCHECK_EQ(net::OK, result);
if (!user_callback_.is_null())
user_callback_.Run();
// We may be holding the last reference to this job. Do not access |this|
// after Release().
Release(); // Acquired on Start().
}
} // namespace.
// Static.
bool ViewHttpCacheJobFactory::IsSupportedURL(const GURL& url) {
return url.SchemeIs(kChromeUIScheme) &&
url.host() == kChromeUINetworkViewCacheHost;
}
// Static.
net::URLRequestJob* ViewHttpCacheJobFactory::CreateJobForRequest(
net::URLRequest* request, net::NetworkDelegate* network_delegate) {
return new ViewHttpCacheJob(request, network_delegate);
}
} // namespace content
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