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content / public / test / test_download_http_response.cc [blame]
// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/342213636): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "content/public/test/test_download_http_response.h"
#include <inttypes.h>
#include <algorithm>
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/functional/callback_forward.h"
#include "base/functional/callback_helpers.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/run_loop.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/synchronization/lock.h"
#include "base/task/single_thread_task_runner.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/test_completion_callback.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_util.h"
#include "net/test/embedded_test_server/http_response.h"
namespace content {
namespace {
// Lock object for protecting |g_parameters_map|.
base::LazyInstance<base::Lock>::Leaky g_lock = LAZY_INSTANCE_INITIALIZER;
using ParametersMap = std::map<GURL, TestDownloadHttpResponse::Parameters>;
// Maps url to Parameters so that requests for the same URL will get the same
// parameters.
base::LazyInstance<ParametersMap>::Leaky g_parameters_map =
LAZY_INSTANCE_INITIALIZER;
const char* kTestDownloadPath = "/download/";
// The size of buffer to send the entity body. The header will always be sent in
// one buffer.
const int64_t kBufferSize = 64 * 1024;
// Xorshift* PRNG from https://en.wikipedia.org/wiki/Xorshift
uint64_t XorShift64StarWithIndex(uint64_t seed, uint64_t index) {
const uint64_t kMultiplier = UINT64_C(2685821657736338717);
uint64_t x = seed * kMultiplier + index;
x ^= x >> 12;
x ^= x << 25;
x ^= x >> 27;
return x * kMultiplier;
}
// Called to resume the response.
void OnResume(scoped_refptr<base::SingleThreadTaskRunner> task_runner,
base::OnceClosure resume_callback) {
task_runner->PostTask(FROM_HERE, std::move(resume_callback));
}
void OnResponseSentOnServerIOThread(
TestDownloadHttpResponse::OnResponseSentCallback callback,
std::unique_ptr<TestDownloadHttpResponse::CompletedRequest> request) {
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), std::move(request)));
}
GURL GetURLFromRequest(const net::test_server::HttpRequest& request) {
return GURL(base::StringPrintf(
"http://%s%s", request.headers.at(net::HttpRequestHeaders::kHost).c_str(),
request.relative_url.c_str()));
}
// The shim response object used by embedded_test_server. After this object is
// deleted, we may continue to send data with cached SendBytesCallback to
// support pause/resume behaviors.
class HttpResponse : public net::test_server::HttpResponse {
public:
explicit HttpResponse(base::WeakPtr<TestDownloadHttpResponse> owner)
: owner_(owner) {}
HttpResponse(const HttpResponse&) = delete;
HttpResponse& operator=(const HttpResponse&) = delete;
~HttpResponse() override = default;
private:
// net::test_server::HttpResponse implementations.
void SendResponse(
base::WeakPtr<net::test_server::HttpResponseDelegate> delegate) override {
if (owner_)
owner_->SendResponse(delegate);
}
base::WeakPtr<TestDownloadHttpResponse> owner_;
};
} // namespace
const char TestDownloadHttpResponse::kTestDownloadHostName[] =
"*.default.example.com";
// static
GURL TestDownloadHttpResponse::GetNextURLForDownload() {
static int index = 0;
std::string url_string = base::StringPrintf("http://%d.default.example.com%s",
++index, kTestDownloadPath);
return GURL(url_string);
}
TestDownloadHttpResponse::HttpResponseData::HttpResponseData(
int64_t min_offset,
int64_t max_offset,
const std::string& response,
bool is_transient,
bool delay_response)
: min_offset(min_offset),
max_offset(max_offset),
response(response),
is_transient(is_transient),
delay_response(delay_response) {}
// static
TestDownloadHttpResponse::Parameters
TestDownloadHttpResponse::Parameters::WithSingleInterruption(
const TestDownloadHttpResponse::InjectErrorCallback& inject_error_cb) {
Parameters parameters;
parameters.injected_errors.push(parameters.size / 2);
parameters.inject_error_cb = inject_error_cb;
return parameters;
}
TestDownloadHttpResponse::Parameters::Parameters()
: etag("abcd"),
last_modified("Tue, 15 Nov 1994 12:45:26 GMT"),
content_type("application/octet-stream"),
size(102400),
pattern_generator_seed(1),
support_byte_ranges(true),
support_partial_response(true) {}
TestDownloadHttpResponse::Parameters::Parameters(const Parameters& that) =
default;
TestDownloadHttpResponse::Parameters& TestDownloadHttpResponse::Parameters::
operator=(const Parameters& that) = default;
TestDownloadHttpResponse::Parameters::~Parameters() = default;
void TestDownloadHttpResponse::Parameters::ClearInjectedErrors() {
base::queue<int64_t> empty_error_list;
injected_errors.swap(empty_error_list);
inject_error_cb.Reset();
}
void TestDownloadHttpResponse::Parameters::SetResponseForRangeRequest(
int64_t min_offset,
int64_t max_offset,
const std::string& response,
bool is_transient,
bool delay_response) {
range_request_responses.emplace_back(HttpResponseData(
min_offset, max_offset, response, is_transient, delay_response));
}
TestDownloadHttpResponse::CompletedRequest::CompletedRequest(
const net::test_server::HttpRequest& request)
: http_request(request) {}
TestDownloadHttpResponse::CompletedRequest::~CompletedRequest() = default;
// static
void TestDownloadHttpResponse::StartServing(
const TestDownloadHttpResponse::Parameters& parameters,
const GURL& url) {
base::AutoLock lock(*g_lock.Pointer());
auto& parameters_map = g_parameters_map.Get();
parameters_map.erase(url);
parameters_map.emplace(url, parameters);
}
// static
void TestDownloadHttpResponse::StartServingStaticResponse(
const std::string& response,
const GURL& url) {
TestDownloadHttpResponse::Parameters parameters;
parameters.static_response = response;
StartServing(std::move(parameters), url);
}
std::unique_ptr<net::test_server::HttpResponse>
TestDownloadHttpResponse::CreateResponseForTestServer() {
return std::make_unique<HttpResponse>(weak_ptr_factory_.GetWeakPtr());
}
// static
std::string TestDownloadHttpResponse::GetPatternBytes(int seed,
int64_t starting_offset,
int length) {
int64_t seed_offset = starting_offset / sizeof(int64_t);
int64_t first_byte_position = starting_offset % sizeof(int64_t);
std::string output;
while (length > 0) {
uint64_t data = XorShift64StarWithIndex(seed, seed_offset);
int length_to_copy =
std::min(length, static_cast<int>(sizeof(data) - first_byte_position));
char* start_pos = reinterpret_cast<char*>(&data) + first_byte_position;
std::string string_to_append(start_pos, start_pos + length_to_copy);
output.append(string_to_append);
length -= length_to_copy;
++seed_offset;
first_byte_position = 0;
}
return output;
}
TestDownloadHttpResponse::TestDownloadHttpResponse(
const net::test_server::HttpRequest& request,
const Parameters& parameters,
OnResponseSentCallback on_response_sent_callback)
: range_(net::HttpByteRange::Bounded(0, parameters.size - 1)),
response_sent_offset_(0u),
parameters_(parameters),
request_(request),
transferred_bytes_(0u),
on_response_sent_callback_(std::move(on_response_sent_callback)) {
DCHECK_GT(parameters.size, 0) << "File size need to be greater than 0.";
ParseRequestHeader();
}
TestDownloadHttpResponse::~TestDownloadHttpResponse() = default;
void TestDownloadHttpResponse::SendResponse(
base::WeakPtr<net::test_server::HttpResponseDelegate> delegate) {
response_delegate_ = delegate;
// Throw error before sending headers.
if (ShouldAbortImmediately()) {
response_delegate_->SendRawResponseHeaders("");
response_delegate_->SendContents("", GenerateResultClosure());
return;
}
// Call inject error callback to UI thread.
if (!parameters_.injected_errors.empty() &&
parameters_.injected_errors.front() <= range_.last_byte_position() &&
parameters_.injected_errors.front() >= range_.first_byte_position() &&
!parameters_.inject_error_cb.is_null()) {
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(parameters_.inject_error_cb,
range_.first_byte_position(),
parameters_.injected_errors.front() -
range_.first_byte_position()));
}
// Pause before sending headers.
if (ShouldPauseImmediately()) {
PauseResponsesAndWaitForResumption();
return;
}
// Start to send the response.
SendResponseHeaders();
}
void TestDownloadHttpResponse::ParseRequestHeader() {
// Parse HTTP range header from the request.
std::vector<net::HttpByteRange> ranges;
if (request_.headers.find(net::HttpRequestHeaders::kRange) ==
request_.headers.end()) {
return;
}
if (!net::HttpUtil::ParseRangeHeader(
request_.headers.at(net::HttpRequestHeaders::kRange), &ranges)) {
return;
}
if (ranges.size() > 1)
LOG(WARNING) << "Multiple range intervals are not supported.";
// Adjust the response range according to request range. The first byte offset
// of the request may be larger than entity body size.
request_range_ = ranges[0];
if (parameters_.support_partial_response)
range_.set_first_byte_position(request_range_.first_byte_position());
if (request_range_.HasLastBytePosition())
range_.set_last_byte_position(request_range_.last_byte_position());
else
range_.ComputeBounds(parameters_.size);
response_sent_offset_ = range_.first_byte_position();
}
void TestDownloadHttpResponse::SendResponseHeaders() {
// Send static response in |parameters_| and close connection.
if (!parameters_.static_response.empty()) {
response_delegate_->SendRawResponseHeaders(parameters_.static_response);
response_delegate_->SendContents("", GenerateResultClosure());
return;
}
// Send static |range_request_responses| in |parameters_| and close
// connection.
std::string response;
bool delay_response = false;
if (GetResponseForRangeRequest(&response, &delay_response)) {
if (delay_response) {
delayed_response_callback_ =
base::BindOnce(&net::test_server::HttpResponseDelegate::SendContents,
response_delegate_, response, GenerateResultClosure());
response_delegate_->SendRawResponseHeaders(GetDefaultResponseHeaders());
} else {
response_delegate_->SendContents(response, GenerateResultClosure());
}
return;
}
// Send the headers and start to send the body.
response_delegate_->SendRawResponseHeaders(GetDefaultResponseHeaders());
SendResponseBodyChunk();
}
std::string TestDownloadHttpResponse::GetDefaultResponseHeaders() {
std::string headers;
// Send partial response.
if (parameters_.support_partial_response && parameters_.support_byte_ranges) {
bool has_if_range =
base::Contains(request_.headers, net::HttpRequestHeaders::kIfRange);
if (((has_if_range &&
request_.headers.at(net::HttpRequestHeaders::kIfRange) ==
parameters_.etag) ||
(!has_if_range &&
base::Contains(request_.headers, net::HttpRequestHeaders::kRange))) &&
HandleRangeAssumingValidatorMatch(headers)) {
return headers;
}
}
// Send precondition failed for "If-Match" request header.
if (parameters_.support_partial_response && parameters_.support_byte_ranges &&
base::Contains(request_.headers, net::HttpRequestHeaders::kIfMatch)) {
if (request_.headers.at(net::HttpRequestHeaders::kIfMatch) !=
parameters_.etag ||
!HandleRangeAssumingValidatorMatch(headers)) {
// Unlike If-Range, If-Match returns an error if the validators don't
// match.
headers =
"HTTP/1.1 412 Precondition failed\r\n"
"Content-Length: 0\r\n"
"\r\n";
}
return headers;
}
// Send the whole file in entity body if partial response is not supported.
range_.set_first_byte_position(0u);
range_.set_last_byte_position(parameters_.size - 1);
response_sent_offset_ = 0;
headers.append("HTTP/1.1 200 OK\r\n");
if (parameters_.support_byte_ranges)
headers.append("Accept-Ranges: bytes\r\n");
headers.append(
base::StringPrintf("Content-Length: %" PRId64 "\r\n", parameters_.size));
headers.append(GetCommonEntityHeaders());
return headers;
}
bool TestDownloadHttpResponse::GetResponseForRangeRequest(
std::string* output,
bool* delay_response) {
if (!range_.IsValid())
return false;
// Find the response for range request that starts from |requset_offset|.
// Use default logic to generate the response if nothing can be found.
int64_t requset_offset = range_.first_byte_position();
for (auto it = parameters_.range_request_responses.begin();
it != parameters_.range_request_responses.end(); ++it) {
if (it->min_offset == -1 && it->max_offset == -1)
continue;
if (requset_offset < it->min_offset)
continue;
if (it->max_offset == -1 || requset_offset <= it->max_offset) {
*output = it->response;
*delay_response = it->delay_response;
// Update the global parameter for transient response, so the
// next response will be different.
if (it->is_transient) {
parameters_.range_request_responses.erase(it);
base::AutoLock lock(*g_lock.Pointer());
GURL url = GetURLFromRequest(request_);
auto iter = g_parameters_map.Get().find(url);
if (iter != g_parameters_map.Get().end())
g_parameters_map.Get().erase(iter);
g_parameters_map.Get().emplace(url, std::move(parameters_));
}
return true;
}
}
return false;
}
bool TestDownloadHttpResponse::HandleRangeAssumingValidatorMatch(
std::string& response) {
// The request may have specified a range that's out of bounds.
if (request_range_.first_byte_position() >= parameters_.size) {
response = base::StringPrintf(
"HTTP/1.1 416 Range not satisfiable\r\n"
"Content-Range: bytes */%" PRId64
"\r\n"
"Content-Length: 0\r\n",
parameters_.size);
return true;
}
response.append("HTTP/1.1 206 Partial content\r\n");
response.append(base::StringPrintf(
"Content-Range: bytes %" PRId64 "-%" PRId64 "/%" PRId64 "\r\n",
range_.first_byte_position(), range_.last_byte_position(),
parameters_.size));
response.append(base::StringPrintf(
"Content-Length: %" PRId64 "\r\n",
(range_.last_byte_position() - range_.first_byte_position()) + 1));
response.append(GetCommonEntityHeaders());
return true;
}
std::string TestDownloadHttpResponse::GetCommonEntityHeaders() {
std::string headers;
if (!parameters_.content_type.empty()) {
headers.append(base::StringPrintf("Content-Type: %s\r\n",
parameters_.content_type.c_str()));
}
if (!parameters_.etag.empty()) {
headers.append(
base::StringPrintf("ETag: %s\r\n", parameters_.etag.c_str()));
}
if (!parameters_.last_modified.empty()) {
headers.append(base::StringPrintf("Last-Modified: %s\r\n",
parameters_.last_modified.c_str()));
}
headers.append("\r\n");
return headers;
}
std::string TestDownloadHttpResponse::GetResponseChunk(
const net::HttpByteRange& buffer_range) {
DCHECK(buffer_range.IsValid());
DCHECK(buffer_range.HasLastBytePosition());
int64_t length = buffer_range.last_byte_position() -
buffer_range.first_byte_position() + 1;
return GetPatternBytes(parameters_.pattern_generator_seed,
buffer_range.first_byte_position(), length);
}
bool TestDownloadHttpResponse::ShouldAbortImmediately() const {
return !parameters_.injected_errors.empty() &&
parameters_.injected_errors.front() == -1 &&
!parameters_.inject_error_cb.is_null();
}
bool TestDownloadHttpResponse::ShouldPauseImmediately() const {
return parameters_.pause_offset.has_value() &&
parameters_.pause_offset.value() == -1 && parameters_.on_pause_handler;
}
bool TestDownloadHttpResponse::HandlePause(
const net::HttpByteRange& buffer_range) {
if (!parameters_.on_pause_handler || !parameters_.pause_offset.has_value())
return false;
int64_t pause_offset = parameters_.pause_offset.value();
if (pause_offset < request_range_.first_byte_position())
return false;
if (pause_offset > buffer_range.last_byte_position() ||
pause_offset < buffer_range.first_byte_position()) {
return false;
}
// Send the bytes before the pause offset.
net::HttpByteRange range = buffer_range;
if (range.last_byte_position() > pause_offset) {
range.set_last_byte_position(pause_offset - 1);
response_sent_offset_ = pause_offset;
SendBodyChunkInternal(range, base::DoNothing());
}
// Pause now. Don't close the connection to wait for resumption.
PauseResponsesAndWaitForResumption();
return true;
}
bool TestDownloadHttpResponse::HandleInjectedError(
const net::HttpByteRange& buffer_range) {
if (parameters_.injected_errors.empty())
return false;
// Clear all errors before first byte of |range|.
while (!parameters_.injected_errors.empty() &&
parameters_.injected_errors.front() <
buffer_range.first_byte_position()) {
parameters_.injected_errors.pop();
}
int64_t error_offset = parameters_.injected_errors.front();
if (error_offset > buffer_range.last_byte_position())
return false;
// Send the bytes before the error offset, then close the connection.
net::HttpByteRange range = buffer_range;
if (error_offset > buffer_range.first_byte_position()) {
range.set_last_byte_position(error_offset - 1);
DCHECK(range.IsValid());
response_sent_offset_ = error_offset;
SendBodyChunkInternal(range, GenerateResultClosure());
}
return true;
}
bool TestDownloadHttpResponse::ShouldPause(
const net::HttpByteRange& buffer_range) const {
if (!parameters_.on_pause_handler)
return false;
return parameters_.pause_offset >= buffer_range.first_byte_position() &&
parameters_.pause_offset <= buffer_range.last_byte_position();
}
void TestDownloadHttpResponse::PauseResponsesAndWaitForResumption() {
// Clean up the on_pause_handler so response will not be paused again.
base::OnceCallback<OnPauseHandler::RunType> pause_callback =
std::move(parameters_.on_pause_handler);
base::OnceClosure continue_closure = SendNextBodyChunkClosure();
// We may pause before sending the headers.
if (parameters_.pause_offset == -1) {
continue_closure = base::BindOnce(
&TestDownloadHttpResponse::SendResponseHeaders, base::Unretained(this));
}
// Continue to send data after resumption.
// TODO(xingliu): Unwind thread hopping callbacks here.
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(
std::move(pause_callback),
base::BindOnce(OnResume,
base::SingleThreadTaskRunner::GetCurrentDefault(),
std::move(continue_closure))));
}
void TestDownloadHttpResponse::SendResponseBodyChunk() {
// Close the connection when reaching the end.
if (response_sent_offset_ > range_.last_byte_position()) {
GenerateResult();
return;
}
int64_t upper_bound =
std::clamp(response_sent_offset_ + kBufferSize,
range_.first_byte_position(), range_.last_byte_position());
auto buffer_range =
net::HttpByteRange::Bounded(response_sent_offset_, upper_bound);
// Handle pause if needed.
if (HandlePause(buffer_range))
return;
// Handle injected error if needed.
if (HandleInjectedError(buffer_range))
return;
// Send the data buffer by buffer without throwing errors.
response_sent_offset_ = buffer_range.last_byte_position() + 1;
SendBodyChunkInternal(buffer_range, SendNextBodyChunkClosure());
return;
}
void TestDownloadHttpResponse::SendBodyChunkInternal(
const net::HttpByteRange& buffer_range,
base::OnceClosure next) {
std::string response_chunk = GetResponseChunk(buffer_range);
transferred_bytes_ += static_cast<int64_t>(response_chunk.size());
response_delegate_->SendContents(response_chunk, std::move(next));
}
base::OnceClosure TestDownloadHttpResponse::SendNextBodyChunkClosure() {
return base::BindOnce(&TestDownloadHttpResponse::SendResponseBodyChunk,
base::Unretained(this));
}
void TestDownloadHttpResponse::SendDelayedResponse() {
if (delayed_response_callback_)
std::move(delayed_response_callback_).Run();
}
void TestDownloadHttpResponse::GenerateResult() {
auto completed_request = std::make_unique<CompletedRequest>(request_);
// Transferred bytes in [range_.first_byte_position(), response_sent_offset_).
completed_request->transferred_byte_count = transferred_bytes_;
OnResponseSentOnServerIOThread(std::move(on_response_sent_callback_),
std::move(completed_request));
// Close the HTTP connection.
response_delegate_->FinishResponse();
}
base::OnceClosure TestDownloadHttpResponse::GenerateResultClosure() {
return base::BindOnce(&TestDownloadHttpResponse::GenerateResult,
base::Unretained(this));
}
std::unique_ptr<net::test_server::HttpResponse>
TestDownloadResponseHandler::HandleTestDownloadRequest(
TestDownloadHttpResponse::OnResponseSentCallback callback,
const net::test_server::HttpRequest& request) {
server_task_runner_ = base::SingleThreadTaskRunner::GetCurrentDefault();
if (request.headers.find(net::HttpRequestHeaders::kHost) ==
request.headers.end()) {
return nullptr;
}
base::AutoLock lock(*g_lock.Pointer());
GURL url = GetURLFromRequest(request);
auto iter = g_parameters_map.Get().find(url);
if (iter != g_parameters_map.Get().end()) {
auto test_response = std::make_unique<TestDownloadHttpResponse>(
request, std::move(iter->second), std::move(callback));
auto response = test_response->CreateResponseForTestServer();
responses_.emplace_back(std::move(test_response));
return response;
}
return nullptr;
}
TestDownloadResponseHandler::TestDownloadResponseHandler() = default;
TestDownloadResponseHandler::~TestDownloadResponseHandler() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
for (auto& response : responses_)
server_task_runner_->DeleteSoon(FROM_HERE, response.release());
}
void TestDownloadResponseHandler::RegisterToTestServer(
net::test_server::EmbeddedTestServer* server) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!server->Started())
<< "Register request handler before starting the server";
server->RegisterRequestHandler(base::BindRepeating(
&content::TestDownloadResponseHandler::HandleTestDownloadRequest,
base::Unretained(this),
base::BindRepeating(
&content::TestDownloadResponseHandler::OnRequestCompleted,
base::Unretained(this))));
}
void TestDownloadResponseHandler::OnRequestCompleted(
std::unique_ptr<TestDownloadHttpResponse::CompletedRequest> request) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
completed_requests_.push_back(std::move(request));
if (run_loop_ && run_loop_->running() &&
completed_requests().size() >= request_count_) {
run_loop_->Quit();
}
}
void TestDownloadResponseHandler::WaitUntilCompletion(size_t request_count) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
request_count_ = request_count;
if ((run_loop_ && run_loop_->running()) ||
completed_requests().size() >= request_count_) {
return;
}
run_loop_ = std::make_unique<base::RunLoop>();
run_loop_->Run();
}
void TestDownloadResponseHandler::DispatchDelayedResponses() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
for (auto& response : responses_) {
server_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&TestDownloadHttpResponse::SendDelayedResponse,
base::Unretained(response.get())));
}
}
} // namespace content