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// Copyright 2017 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/common/service_worker/service_worker_loader_helpers.h"
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/strings/stringprintf.h"
#include "content/public/common/content_features.h"
#include "content/public/common/resource_type.h"
#include "mojo/public/cpp/bindings/strong_binding.h"
#include "net/http/http_util.h"
#include "services/network/loader_util.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/resource_request_body.h"
#include "services/network/public/cpp/resource_response.h"
#include "ui/base/page_transition_types.h"
namespace content {
namespace {
// Calls |callback| when Blob reading is complete.
class BlobCompleteCaller : public blink::mojom::BlobReaderClient {
public:
using BlobCompleteCallback = base::OnceCallback<void(int net_error)>;
explicit BlobCompleteCaller(BlobCompleteCallback callback)
: callback_(std::move(callback)) {}
~BlobCompleteCaller() override = default;
void OnCalculatedSize(uint64_t total_size,
uint64_t expected_content_size) override {}
void OnComplete(int32_t status, uint64_t data_length) override {
std::move(callback_).Run(base::checked_cast<int>(status));
}
private:
BlobCompleteCallback callback_;
};
// Sets |has_range_out| to true if |headers| specify a single range request, and
// |offset_out| and |size_out| to the range. Returns true on valid input
// (regardless of |has_range_out|), and false if there is more than one range or
// if the bounds overflow.
bool ExtractSinglePartHttpRange(const net::HttpRequestHeaders& headers,
bool* has_range_out,
uint64_t* offset_out,
uint64_t* length_out) {
std::string range_header;
*has_range_out = false;
if (!headers.GetHeader(net::HttpRequestHeaders::kRange, &range_header))
return true;
std::vector<net::HttpByteRange> ranges;
if (!net::HttpUtil::ParseRangeHeader(range_header, &ranges))
return true;
// Multi-part (or invalid) ranges are not supported.
if (ranges.size() != 1)
return false;
// Safely parse the single range to our more-sane output format.
*has_range_out = true;
const net::HttpByteRange& byte_range = ranges[0];
if (byte_range.first_byte_position() < 0)
return false;
// Allow the range [0, -1] to be valid and specify the entire range.
if (byte_range.first_byte_position() == 0 &&
byte_range.last_byte_position() == -1) {
*has_range_out = false;
return true;
}
if (byte_range.last_byte_position() < 0)
return false;
uint64_t first_byte_position =
static_cast<uint64_t>(byte_range.first_byte_position());
uint64_t last_byte_position =
static_cast<uint64_t>(byte_range.last_byte_position());
base::CheckedNumeric<uint64_t> length = last_byte_position;
length -= first_byte_position;
length += 1;
if (!length.IsValid())
return false;
*offset_out = static_cast<uint64_t>(byte_range.first_byte_position());
*length_out = length.ValueOrDie();
return true;
}
} // namespace
// static
void ServiceWorkerLoaderHelpers::SaveResponseHeaders(
const int status_code,
const std::string& status_text,
const base::flat_map<std::string, std::string>& headers,
network::ResourceResponseHead* out_head) {
// Build a string instead of using HttpResponseHeaders::AddHeader on
// each header, since AddHeader has O(n^2) performance.
std::string buf(base::StringPrintf("HTTP/1.1 %d %s\r\n", status_code,
status_text.c_str()));
for (const auto& item : headers) {
buf.append(item.first);
buf.append(": ");
buf.append(item.second);
buf.append("\r\n");
}
buf.append("\r\n");
out_head->headers = new net::HttpResponseHeaders(
net::HttpUtil::AssembleRawHeaders(buf.c_str(), buf.size()));
// Populate |out_head|'s MIME type with the value from the HTTP response
// headers.
if (out_head->mime_type.empty()) {
std::string mime_type;
if (out_head->headers->GetMimeType(&mime_type))
out_head->mime_type = mime_type;
}
// Populate |out_head|'s charset with the value from the HTTP response
// headers.
if (out_head->charset.empty()) {
std::string charset;
if (out_head->headers->GetCharset(&charset))
out_head->charset = charset;
}
}
// static
void ServiceWorkerLoaderHelpers::SaveResponseInfo(
const blink::mojom::FetchAPIResponse& response,
network::ResourceResponseHead* out_head) {
out_head->was_fetched_via_service_worker = true;
out_head->was_fallback_required_by_service_worker = false;
out_head->url_list_via_service_worker = response.url_list;
out_head->response_type = response.response_type;
out_head->response_time = response.response_time;
out_head->is_in_cache_storage = response.is_in_cache_storage;
if (response.cache_storage_cache_name)
out_head->cache_storage_cache_name = *(response.cache_storage_cache_name);
else
out_head->cache_storage_cache_name.clear();
out_head->cors_exposed_header_names = response.cors_exposed_header_names;
out_head->did_service_worker_navigation_preload = false;
}
// static
base::Optional<net::RedirectInfo>
ServiceWorkerLoaderHelpers::ComputeRedirectInfo(
const network::ResourceRequest& original_request,
const network::ResourceResponseHead& response_head,
bool token_binding_negotiated) {
std::string new_location;
if (!response_head.headers->IsRedirect(&new_location))
return base::nullopt;
// If the request is a MAIN_FRAME request, the first-party URL gets
// updated on redirects.
const net::URLRequest::FirstPartyURLPolicy first_party_url_policy =
original_request.resource_type == RESOURCE_TYPE_MAIN_FRAME
? net::URLRequest::UPDATE_FIRST_PARTY_URL_ON_REDIRECT
: net::URLRequest::NEVER_CHANGE_FIRST_PARTY_URL;
return net::RedirectInfo::ComputeRedirectInfo(
original_request.method, original_request.url,
original_request.site_for_cookies, first_party_url_policy,
original_request.referrer_policy,
network::ComputeReferrer(original_request.referrer),
response_head.headers.get(), response_head.headers->response_code(),
original_request.url.Resolve(new_location), false,
token_binding_negotiated);
}
int ServiceWorkerLoaderHelpers::ReadBlobResponseBody(
blink::mojom::BlobPtr* blob,
const net::HttpRequestHeaders& headers,
base::OnceCallback<void(int)> on_blob_read_complete,
mojo::ScopedDataPipeConsumerHandle* handle_out) {
bool byte_range_set = false;
uint64_t offset = 0;
uint64_t length = 0;
// We don't support multiple range requests in one single URL request,
// because we need to do multipart encoding here.
// TODO(falken): Support multipart byte range requests.
if (!ExtractSinglePartHttpRange(headers, &byte_range_set, &offset, &length)) {
return net::ERR_REQUEST_RANGE_NOT_SATISFIABLE;
}
mojo::DataPipe data_pipe;
blink::mojom::BlobReaderClientPtr blob_reader_client;
mojo::MakeStrongBinding(
std::make_unique<BlobCompleteCaller>(std::move(on_blob_read_complete)),
mojo::MakeRequest(&blob_reader_client));
if (byte_range_set) {
(*blob)->ReadRange(offset, length, std::move(data_pipe.producer_handle),
std::move(blob_reader_client));
} else {
(*blob)->ReadAll(std::move(data_pipe.producer_handle),
std::move(blob_reader_client));
}
*handle_out = std::move(data_pipe.consumer_handle);
return net::OK;
}
} // namespace content
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