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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/upgrade_detector/version_history_client.h"
#include <memory>
#include <string>
#include <utility>
#include "base/functional/callback.h"
#include "base/json/json_reader.h"
#include "base/strings/escape.h"
#include "base/strings/stringprintf.h"
#include "base/version_info/version_info.h"
#include "build/build_config.h"
#include "chrome/browser/browser_process.h"
#include "chrome/common/channel_info.h"
#include "net/base/load_flags.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/cpp/simple_url_loader.h"
#if BUILDFLAG(IS_CHROMEOS) && BUILDFLAG(GOOGLE_CHROME_BRANDING)
#include "base/system/sys_info.h"
#include "chromeos/crosapi/cpp/crosapi_constants.h"
#endif // BUILDFLAG(IS_CHROMEOS) && BUILDFLAG(GOOGLE_CHROME_BRANDING)
namespace {
// Returns the name of the current channel, as ingested by the VersionHistory
// API.
std::string GetChannelString() {
std::string channel =
chrome::GetChannelName(chrome::WithExtendedStable(true));
if (channel == "unknown") {
return "stable";
}
if (!channel.empty()) {
return channel;
}
#if BUILDFLAG(IS_CHROMEOS) && BUILDFLAG(GOOGLE_CHROME_BRANDING)
// "" could mean Stable, LTC, or LTS. Find out which.
std::string crosapi_channel_name;
if (base::SysInfo::GetLsbReleaseValue(crosapi::kChromeOSReleaseTrack,
&crosapi_channel_name)) {
if (crosapi_channel_name == crosapi::kReleaseChannelLtc) {
return "ltc";
}
if (crosapi_channel_name == crosapi::kReleaseChannelLts) {
return "lts";
}
}
#endif // BUILDFLAG(IS_CHROMEOS) && BUILDFLAG(GOOGLE_CHROME_BRANDING)
return "stable";
}
constexpr net::NetworkTrafficAnnotationTag kTrafficAnnotation =
net::DefineNetworkTrafficAnnotation("version_history", R"(
semantics {
sender: "VersionHistory Client"
description:
"Queries the VersionHistory API to know how old the "
"currently-running version of Chrome is. If it's older than a "
"threshold configured by the admin, Chrome forces a relaunch (or "
"ChromeOS forces a restart) to apply the update."
trigger:
"When Chrome detects that an update is available, if the "
"RelaunchFastIfOutdated policy is set."
data: "The version number of the currently-running Chrome/ChromeOS, "
"the update channel name, and an identifier of the platform."
destination: GOOGLE_OWNED_SERVICE
user_data {
type: NONE
}
internal {
contacts {
email: "cec-growth-eng@google.com"
}
}
last_reviewed: "2025-03-06"
}
policy {
cookies_allowed: NO
setting: "This feature cannot be disabled by settings."
chrome_policy {
RelaunchFastIfOutdated {
RelaunchFastIfOutdated: 0
}
}
})");
// Sends a GET to `url`, and calls `callback` with the response.
void FetchUrl(GURL url,
base::OnceCallback<void(std::unique_ptr<network::SimpleURLLoader>,
std::optional<std::string>)> callback) {
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory =
g_browser_process->shared_url_loader_factory();
auto request = std::make_unique<network::ResourceRequest>();
request->url = std::move(url);
request->load_flags = net::LOAD_DISABLE_CACHE | net::LOAD_BYPASS_CACHE;
request->credentials_mode = network::mojom::CredentialsMode::kOmit;
request->priority = net::IDLE;
std::unique_ptr<network::SimpleURLLoader> url_loader =
network::SimpleURLLoader::Create(std::move(request), kTrafficAnnotation);
url_loader->SetRetryOptions(
/*max_retries=*/3,
network::SimpleURLLoader::RetryMode::RETRY_ON_NETWORK_CHANGE);
network::SimpleURLLoader* url_loader_raw = url_loader.get();
// Move `url_loader` to the callback so the request can finish.
url_loader_raw->DownloadToString(
url_loader_factory.get(),
base::BindOnce(std::move(callback), std::move(url_loader)),
/*max_body_size=*/1024 * 1024);
}
// Parses and extract the most recent `serving.endTime` from `raw_data` JSON.
std::optional<base::Time> OnVersionReleasesFetched(
std::unique_ptr<network::SimpleURLLoader> url_loader,
std::optional<std::string> raw_data) {
if (!raw_data) {
return std::nullopt;
}
std::optional<base::Value::Dict> json = base::JSONReader::ReadDict(*raw_data);
if (!json) {
return std::nullopt;
}
const base::Value::List* releases = json->FindList("releases");
if (!releases || releases->empty()) {
return std::nullopt;
}
// The first element is always the most recent, due to the "order_by" query
// parameter.
const base::Value& most_recent_release = releases->front();
if (!most_recent_release.is_dict()) {
return std::nullopt;
}
const std::string* end_time =
most_recent_release.GetDict().FindStringByDottedPath("serving.endTime");
if (!end_time) {
// Builds with no end-time are still serving, so they're not outdated.
return std::nullopt;
}
base::Time time;
if (!base::Time::FromUTCString(end_time->c_str(), &time)) {
return std::nullopt;
}
return time;
}
} // namespace
// Returns the URL to get version info of `version` on the current platform
// and channel. The response contains the single release with the most recent
// `serving.endTime`.
GURL GetVersionReleasesUrl(base::Version version) {
// CURRENT_PLATFORM is the platform name, as ingested by the VersionHistory API.
// Use #define instead of a constant, so it concatenates at compile-time.
#if BUILDFLAG(IS_WIN)
#if defined(ARCH_CPU_ARM64)
#define CURRENT_PLATFORM "win_arm64"
#elif defined(ARCH_CPU_X86_64)
#define CURRENT_PLATFORM "win64"
#else
#define CURRENT_PLATFORM "win"
#endif
#elif BUILDFLAG(IS_LINUX)
#define CURRENT_PLATFORM "linux"
#elif BUILDFLAG(IS_MAC)
#if defined(ARCH_CPU_ARM64)
#define CURRENT_PLATFORM "mac_arm64"
#else
#define CURRENT_PLATFORM "mac"
#endif
#elif BUILDFLAG(IS_CHROMEOS)
#define CURRENT_PLATFORM "chromeos"
#else
#error Unsupported platform
#endif // BUILDFLAG(IS_WIN)
return GURL(base::StringPrintf(
"https://versionhistory.googleapis.com/v1/chrome/"
"platforms/" CURRENT_PLATFORM
"/channels/%s/versions/%s/releases/?order_by=endtime%%20desc&page_size=1",
GetChannelString(), version.GetString()));
#undef CURRENT_PLATFORM
}
void GetLastServedDate(base::Version version, LastServedDateCallback callback) {
FetchUrl(GetVersionReleasesUrl(std::move(version)),
base::BindOnce(&OnVersionReleasesFetched).Then(std::move(callback)));
}
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