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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/public/common/shared_storage/module_script_downloader.h"
#include <string_view>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "net/base/net_errors.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_status_code.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/simple_url_loader.h"
#include "services/network/public/mojom/url_loader_factory.mojom.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/blink/public/common/mime_util/mime_util.h"
#include "url/gurl.h"
namespace blink {
namespace {
constexpr net::NetworkTrafficAnnotationTag kTrafficAnnotation =
net::DefineNetworkTrafficAnnotation(
"shared_storage_worklet_module_script_downloader",
R"(
semantics {
sender: "ModuleScriptDownloader"
description:
"Requests the module script for shared storage worklet."
trigger:
"Requested when window.sharedStorage.worklet.addModule() is "
"invoked. This is an API that any website can call."
data: "URL of the script."
destination: WEBSITE
internal {
contacts {
email: "yaoxia@google.com"
}
contacts {
email: "cammie@google.com"
}
}
user_data {
type: NONE
}
last_reviewed: "2023-03-01"
}
policy {
cookies_allowed: YES
cookies_store: "user"
setting:
"These requests can be disabled in chrome://settings/privacySandbox."
policy_exception_justification:
"These requests are triggered by a website."
})");
// Checks if `charset` is a valid charset, in lowercase ASCII. Takes `body` as
// well, to ensure it uses the specified charset.
bool IsAllowedCharset(std::string_view charset, const std::string& body) {
if (charset == "utf-8" || charset.empty()) {
return base::IsStringUTF8(body);
} else if (charset == "us-ascii") {
return base::IsStringASCII(body);
}
// TODO(yaoxia): Worth supporting iso-8859-1, or full character set list?
return false;
}
} // namespace
ModuleScriptDownloader::ModuleScriptDownloader(
network::mojom::URLLoaderFactory* url_loader_factory,
const GURL& source_url,
ModuleScriptDownloaderCallback module_script_downloader_callback)
: source_url_(source_url),
module_script_downloader_callback_(
std::move(module_script_downloader_callback)) {
DCHECK(module_script_downloader_callback_);
auto resource_request = std::make_unique<network::ResourceRequest>();
resource_request->url = source_url;
// These fields are ignored, but mirror the browser-side behavior to be safe.
resource_request->redirect_mode = network::mojom::RedirectMode::kError;
resource_request->credentials_mode =
network::mojom::CredentialsMode::kSameOrigin;
resource_request->headers.SetHeader(
net::HttpRequestHeaders::kAccept,
std::string_view("application/javascript"));
resource_request->site_for_cookies = net::SiteForCookies::FromUrl(source_url);
simple_url_loader_ = network::SimpleURLLoader::Create(
std::move(resource_request), kTrafficAnnotation);
// Abort on redirects.
// TODO(yaoxia): May want a browser-side proxy to block redirects instead.
simple_url_loader_->SetOnRedirectCallback(base::BindRepeating(
&ModuleScriptDownloader::OnRedirect, base::Unretained(this)));
// TODO(yaoxia): Consider limiting the size of response bodies.
simple_url_loader_->DownloadToStringOfUnboundedSizeUntilCrashAndDie(
url_loader_factory,
base::BindOnce(&ModuleScriptDownloader::OnBodyReceived,
base::Unretained(this)));
}
ModuleScriptDownloader::~ModuleScriptDownloader() = default;
void ModuleScriptDownloader::OnBodyReceived(std::unique_ptr<std::string> body) {
DCHECK(module_script_downloader_callback_);
auto simple_url_loader = std::move(simple_url_loader_);
if (!body) {
std::string error_message;
if (simple_url_loader->ResponseInfo() &&
simple_url_loader->ResponseInfo()->headers &&
simple_url_loader->ResponseInfo()->headers->response_code() / 100 !=
2) {
int status = simple_url_loader->ResponseInfo()->headers->response_code();
error_message = base::StringPrintf(
"Failed to load %s HTTP status = %d %s.", source_url_.spec().c_str(),
status,
simple_url_loader->ResponseInfo()->headers->GetStatusText().c_str());
} else {
error_message = base::StringPrintf(
"Failed to load %s error = %s.", source_url_.spec().c_str(),
net::ErrorToString(simple_url_loader->NetError()).c_str());
}
std::move(module_script_downloader_callback_)
.Run(/*body=*/nullptr, error_message,
simple_url_loader->TakeResponseInfo());
return;
}
if (!blink::IsSupportedJavascriptMimeType(
simple_url_loader->ResponseInfo()->mime_type)) {
std::move(module_script_downloader_callback_)
.Run(/*body=*/nullptr,
base::StringPrintf(
"Rejecting load of %s due to unexpected MIME type.",
source_url_.spec().c_str()),
simple_url_loader->TakeResponseInfo());
return;
}
if (!IsAllowedCharset(simple_url_loader->ResponseInfo()->charset, *body)) {
std::move(module_script_downloader_callback_)
.Run(/*body=*/nullptr,
base::StringPrintf(
"Rejecting load of %s due to unexpected charset.",
source_url_.spec().c_str()),
simple_url_loader->TakeResponseInfo());
return;
}
// All OK!
std::move(module_script_downloader_callback_)
.Run(std::move(body), /*error_message=*/{},
simple_url_loader->TakeResponseInfo());
}
void ModuleScriptDownloader::OnRedirect(
const GURL& url_before_redirect,
const net::RedirectInfo& redirect_info,
const network::mojom::URLResponseHead& response_head,
std::vector<std::string>* removed_headers) {
DCHECK(module_script_downloader_callback_);
// Need to cancel the load, to prevent the request from continuing.
simple_url_loader_.reset();
std::move(module_script_downloader_callback_)
.Run(/*body=*/nullptr,
base::StringPrintf("Unexpected redirect on %s.",
source_url_.spec().c_str()),
nullptr);
}
} // namespace blink
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