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// Copyright (c) 2013 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/streams/stream_url_request_job.h"
#include "base/strings/string_number_conversions.h"
#include "content/browser/streams/stream.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/http/http_byte_range.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_response_info.h"
#include "net/http/http_util.h"
#include "net/url_request/url_request.h"
namespace content {
StreamURLRequestJob::StreamURLRequestJob(
net::URLRequest* request,
net::NetworkDelegate* network_delegate,
scoped_refptr<Stream> stream)
: net::URLRequestJob(request, network_delegate),
weak_factory_(this),
stream_(stream),
headers_set_(false),
pending_buffer_size_(0),
total_bytes_read_(0),
max_range_(0),
request_failed_(false) {
DCHECK(stream_.get());
stream_->SetReadObserver(this);
}
StreamURLRequestJob::~StreamURLRequestJob() {
ClearStream();
}
void StreamURLRequestJob::OnDataAvailable(Stream* stream) {
// Clear the IO_PENDING status.
SetStatus(net::URLRequestStatus());
// Do nothing if pending_buffer_ is empty, i.e. there's no ReadRawData()
// operation waiting for IO completion.
if (!pending_buffer_.get())
return;
// pending_buffer_ is set to the IOBuffer instance provided to ReadRawData()
// by URLRequestJob.
int bytes_read;
switch (stream_->ReadRawData(
pending_buffer_.get(), pending_buffer_size_, &bytes_read)) {
case Stream::STREAM_HAS_DATA:
DCHECK_GT(bytes_read, 0);
break;
case Stream::STREAM_COMPLETE:
// Ensure this. Calling NotifyReadComplete call with 0 signals
// completion.
bytes_read = 0;
break;
case Stream::STREAM_EMPTY:
NOTREACHED();
break;
case Stream::STREAM_ABORTED:
// Handle this as connection reset.
NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED,
net::ERR_CONNECTION_RESET));
break;
}
// Clear the buffers before notifying the read is complete, so that it is
// safe for the observer to read.
pending_buffer_ = NULL;
pending_buffer_size_ = 0;
total_bytes_read_ += bytes_read;
NotifyReadComplete(bytes_read);
}
// net::URLRequestJob methods.
void StreamURLRequestJob::Start() {
// Continue asynchronously.
base::MessageLoop::current()->PostTask(
FROM_HERE,
base::Bind(&StreamURLRequestJob::DidStart, weak_factory_.GetWeakPtr()));
}
void StreamURLRequestJob::Kill() {
net::URLRequestJob::Kill();
weak_factory_.InvalidateWeakPtrs();
ClearStream();
}
bool StreamURLRequestJob::ReadRawData(net::IOBuffer* buf,
int buf_size,
int* bytes_read) {
if (request_failed_)
return true;
DCHECK(buf);
DCHECK(bytes_read);
int to_read = buf_size;
if (max_range_ && to_read) {
if (to_read + total_bytes_read_ > max_range_)
to_read = max_range_ - total_bytes_read_;
if (to_read <= 0) {
*bytes_read = 0;
return true;
}
}
switch (stream_->ReadRawData(buf, to_read, bytes_read)) {
case Stream::STREAM_HAS_DATA:
case Stream::STREAM_COMPLETE:
total_bytes_read_ += *bytes_read;
return true;
case Stream::STREAM_EMPTY:
pending_buffer_ = buf;
pending_buffer_size_ = to_read;
SetStatus(net::URLRequestStatus(net::URLRequestStatus::IO_PENDING, 0));
return false;
case Stream::STREAM_ABORTED:
// Handle this as connection reset.
NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED,
net::ERR_CONNECTION_RESET));
return false;
}
NOTREACHED();
return false;
}
bool StreamURLRequestJob::GetMimeType(std::string* mime_type) const {
if (!response_info_)
return false;
// TODO(zork): Support registered MIME types if needed.
return response_info_->headers->GetMimeType(mime_type);
}
void StreamURLRequestJob::GetResponseInfo(net::HttpResponseInfo* info) {
if (response_info_)
*info = *response_info_;
}
int StreamURLRequestJob::GetResponseCode() const {
if (!response_info_)
return -1;
return response_info_->headers->response_code();
}
void StreamURLRequestJob::SetExtraRequestHeaders(
const net::HttpRequestHeaders& headers) {
std::string range_header;
if (headers.GetHeader(net::HttpRequestHeaders::kRange, &range_header)) {
std::vector<net::HttpByteRange> ranges;
if (net::HttpUtil::ParseRangeHeader(range_header, &ranges)) {
if (ranges.size() == 1) {
// Streams don't support seeking, so a non-zero starting position
// doesn't make sense.
if (ranges[0].first_byte_position() == 0) {
max_range_ = ranges[0].last_byte_position() + 1;
} else {
NotifyFailure(net::ERR_METHOD_NOT_SUPPORTED);
return;
}
} else {
NotifyFailure(net::ERR_METHOD_NOT_SUPPORTED);
return;
}
}
}
}
void StreamURLRequestJob::DidStart() {
// We only support GET request.
if (request()->method() != "GET") {
NotifyFailure(net::ERR_METHOD_NOT_SUPPORTED);
return;
}
HeadersCompleted(net::HTTP_OK);
}
void StreamURLRequestJob::NotifyFailure(int error_code) {
request_failed_ = true;
// If we already return the headers on success, we can't change the headers
// now. Instead, we just error out.
if (headers_set_) {
NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED,
error_code));
return;
}
// TODO(zork): Share these with BlobURLRequestJob.
net::HttpStatusCode status_code = net::HTTP_INTERNAL_SERVER_ERROR;
switch (error_code) {
case net::ERR_ACCESS_DENIED:
status_code = net::HTTP_FORBIDDEN;
break;
case net::ERR_FILE_NOT_FOUND:
status_code = net::HTTP_NOT_FOUND;
break;
case net::ERR_METHOD_NOT_SUPPORTED:
status_code = net::HTTP_METHOD_NOT_ALLOWED;
break;
case net::ERR_FAILED:
break;
default:
DCHECK(false);
break;
}
HeadersCompleted(status_code);
}
void StreamURLRequestJob::HeadersCompleted(net::HttpStatusCode status_code) {
std::string status("HTTP/1.1 ");
status.append(base::IntToString(status_code));
status.append(" ");
status.append(net::GetHttpReasonPhrase(status_code));
status.append("\0\0", 2);
net::HttpResponseHeaders* headers = new net::HttpResponseHeaders(status);
if (status_code == net::HTTP_OK) {
std::string content_type_header(net::HttpRequestHeaders::kContentType);
content_type_header.append(": ");
content_type_header.append("text/plain");
headers->AddHeader(content_type_header);
}
response_info_.reset(new net::HttpResponseInfo());
response_info_->headers = headers;
headers_set_ = true;
NotifyHeadersComplete();
}
void StreamURLRequestJob::ClearStream() {
if (stream_.get()) {
stream_->RemoveReadObserver(this);
stream_ = NULL;
}
}
} // namespace content
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