// Copyright (c) 2012 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 "chrome/browser/ui/webui/about_ui.h"

#include <stddef.h>
#include <stdint.h>

#include <algorithm>
#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "base/bind.h"
#include "base/callback.h"
#include "base/callback_helpers.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/format_macros.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/escape.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/task/thread_pool.h"
#include "base/threading/scoped_blocking_call.h"
#include "base/threading/thread.h"
#include "base/values.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "chrome/browser/about_flags.h"
#include "chrome/browser/ash/borealis/borealis_credits.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/url_constants.h"
#include "chrome/grit/browser_resources.h"
#include "chrome/grit/chromium_strings.h"
#include "chrome/grit/generated_resources.h"
#include "components/about_ui/credit_utils.h"
#include "components/grit/components_resources.h"
#include "components/strings/grit/components_locale_settings.h"
#include "components/strings/grit/components_strings.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/url_data_source.h"
#include "content/public/browser/web_contents.h"
#include "net/base/filename_util.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/webui/web_ui_util.h"
#include "url/gurl.h"

#if !BUILDFLAG(IS_ANDROID)
#include "chrome/browser/ui/webui/theme_source.h"
#endif

#if BUILDFLAG(IS_CHROMEOS_ASH)
#include <map>

#include "base/base64.h"
#include "base/cxx17_backports.h"
#include "base/strings/strcat.h"
#include "chrome/browser/ash/crosapi/browser_manager.h"
#include "chrome/browser/ash/crosapi/browser_util.h"
#include "chrome/browser/ash/crostini/crostini_features.h"
#include "chrome/browser/ash/crostini/crostini_manager.h"
#include "chrome/browser/ash/customization/customization_document.h"
#include "chrome/browser/ash/login/demo_mode/demo_setup_controller.h"
#include "chrome/browser/ash/login/wizard_controller.h"
#include "chrome/browser/browser_process_platform_part_ash.h"
#include "chrome/browser/component_updater/cros_component_manager.h"
#include "chrome/browser/ui/webui/chrome_web_ui_controller_factory.h"
#include "chrome/common/webui_url_constants.h"
#include "chromeos/system/statistics_provider.h"
#include "components/language/core/common/locale_util.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
#endif
#if BUILDFLAG(IS_CHROMEOS_LACROS)
#include "chrome/browser/lacros/lacros_url_handling.h"
#endif  // BUILDFLAG(IS_CHROMEOS_LACROS)

#if BUILDFLAG(IS_CHROMEOS)
#include "chrome/common/webui_url_constants.h"
#include "ui/base/l10n/l10n_util.h"
#endif  // BUILDFLAG(IS_CHROMEOS)

using content::BrowserThread;

namespace {

constexpr char kCreditsJsPath[] = "credits.js";
constexpr char kCreditsCssPath[] = "credits.css";
constexpr char kStatsJsPath[] = "stats.js";
constexpr char kStringsJsPath[] = "strings.js";

#if BUILDFLAG(IS_CHROMEOS_ASH)

constexpr char kKeyboardUtilsPath[] = "keyboard_utils.js";

constexpr char kTerminaCreditsPath[] = "about_os_credits.html";

// APAC region name.
constexpr char kApac[] = "apac";
// EMEA region name.
constexpr char kEmea[] = "emea";
// EU region name.
constexpr char kEu[] = "eu";

// List of countries that belong to APAC.
const char* const kApacCountries[] = {"au", "bd", "cn", "hk", "id", "in", "jp",
                                      "kh", "la", "lk", "mm", "mn", "my", "nz",
                                      "np", "ph", "sg", "th", "tw", "vn"};

// List of countries that belong to EMEA.
const char* const kEmeaCountries[] = {"na", "za", "am", "az", "ch", "eg", "ge",
                                      "il", "is", "ke", "kg", "li", "mk", "no",
                                      "rs", "ru", "tr", "tz", "ua", "ug", "za"};

// List of countries that belong to EU.
const char* const kEuCountries[] = {
    "at", "be", "bg", "cz", "dk", "es", "fi", "fr", "gb", "gr", "hr", "hu",
    "ie", "it", "lt", "lu", "lv", "nl", "pl", "pt", "ro", "se", "si", "sk"};

// Maps country to one of 3 regions: APAC, EMEA, EU.
typedef std::map<std::string, std::string> CountryRegionMap;

// Returns country to region map with EU, EMEA and APAC countries.
CountryRegionMap CreateCountryRegionMap() {
  CountryRegionMap region_map;
  for (size_t i = 0; i < std::size(kApacCountries); ++i) {
    region_map.emplace(kApacCountries[i], kApac);
  }

  for (size_t i = 0; i < std::size(kEmeaCountries); ++i) {
    region_map.emplace(kEmeaCountries[i], kEmea);
  }

  for (size_t i = 0; i < std::size(kEuCountries); ++i) {
    region_map.emplace(kEuCountries[i], kEu);
  }
  return region_map;
}

// Reads device region from VPD. Returns "us" in case of read or parsing errors.
std::string ReadDeviceRegionFromVpd() {
  std::string region = "us";
  chromeos::system::StatisticsProvider* provider =
      chromeos::system::StatisticsProvider::GetInstance();
  bool region_found =
      provider->GetMachineStatistic(chromeos::system::kRegionKey, &region);
  if (region_found) {
    // We only need the first part of the complex region codes like ca.ansi.
    std::vector<std::string> region_pieces = base::SplitString(
        region, ".", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
    if (!region_pieces.empty())
      region = region_pieces[0];
  } else {
    LOG(WARNING) << "Device region for Play Store ToS not found in VPD - "
                    "defaulting to US.";
  }
  return base::ToLowerASCII(region);
}

// Loads bundled terms of service contents (Eula, OEM Eula, Play Store Terms).
// The online version of terms is fetched in OOBE screen javascript. This is
// intentional because chrome://terms runs in a privileged webui context and
// should never load from untrusted places.
class ChromeOSTermsHandler
    : public base::RefCountedThreadSafe<ChromeOSTermsHandler> {
 public:
  ChromeOSTermsHandler(const ChromeOSTermsHandler&) = delete;
  ChromeOSTermsHandler& operator=(const ChromeOSTermsHandler&) = delete;

  static void Start(const std::string& path,
                    content::URLDataSource::GotDataCallback callback) {
    scoped_refptr<ChromeOSTermsHandler> handler(
        new ChromeOSTermsHandler(path, std::move(callback)));
    handler->StartOnUIThread();
  }

 private:
  friend class base::RefCountedThreadSafe<ChromeOSTermsHandler>;

  ChromeOSTermsHandler(const std::string& path,
                       content::URLDataSource::GotDataCallback callback)
      : path_(path),
        callback_(std::move(callback)),
        // Previously we were using "initial locale" http://crbug.com/145142
        locale_(g_browser_process->GetApplicationLocale()) {}

  virtual ~ChromeOSTermsHandler() {}

  void StartOnUIThread() {
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    if (path_ == chrome::kOemEulaURLPath) {
      // Load local OEM EULA from the disk.
      base::ThreadPool::PostTaskAndReply(
          FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
          base::BindOnce(&ChromeOSTermsHandler::LoadOemEulaFileAsync, this),
          base::BindOnce(&ChromeOSTermsHandler::ResponseOnUIThread, this));
    } else if (path_ == chrome::kArcTermsURLPath) {
      LOG(WARNING) << "Could not load offline Play Store ToS.";
    } else if (path_ == chrome::kArcPrivacyPolicyURLPath) {
      LOG(WARNING) << "Could not load offline Play Store privacy policy.";
    } else {
      NOTREACHED();
      ResponseOnUIThread();
    }
  }

  void LoadOemEulaFileAsync() {
    base::ScopedBlockingCall scoped_blocking_call(
        FROM_HERE, base::BlockingType::MAY_BLOCK);

    const ash::StartupCustomizationDocument* customization =
        ash::StartupCustomizationDocument::GetInstance();
    if (!customization->IsReady())
      return;

    base::FilePath oem_eula_file_path;
    if (net::FileURLToFilePath(GURL(customization->GetEULAPage(locale_)),
                               &oem_eula_file_path)) {
      if (!base::ReadFileToString(oem_eula_file_path, &contents_)) {
        contents_.clear();
      }
    }
  }

  std::vector<std::string> CreateArcLocaleLookupArray() {
    // To get Play Store asset we look for the first locale match in the
    // following order:
    // * language and device region combination
    // * default region (APAC, EMEA, EU)
    // * en-US
    // Note: AMERICAS region defaults to en-US and to simplify it is not
    // included in the country region map.
    std::vector<std::string> locale_lookup_array;
    const std::string device_region = ReadDeviceRegionFromVpd();
    locale_lookup_array.push_back(base::StrCat(
        {base::ToLowerASCII(language::ExtractBaseLanguage(locale_)), "-",
         device_region}));

    const CountryRegionMap country_region_map = CreateCountryRegionMap();
    const auto region = country_region_map.find(device_region);
    if (region != country_region_map.end()) {
      locale_lookup_array.push_back(region->second.c_str());
    }

    locale_lookup_array.push_back("en-us");
    return locale_lookup_array;
  }

  void ResponseOnUIThread() {
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    // If we fail to load Chrome OS EULA from disk, load it from resources.
    // Do nothing if OEM EULA or Play Store ToS load failed.
    if (contents_.empty() && path_.empty()) {
      contents_ =
          ui::ResourceBundle::GetSharedInstance().LoadLocalizedResourceString(
              IDS_TERMS_HTML);
    }
    std::move(callback_).Run(
        base::RefCountedString::TakeString(std::move(contents_)));
  }

  // Path in the URL.
  const std::string path_;

  // Callback to run with the response.
  content::URLDataSource::GotDataCallback callback_;

  // Locale of the EULA.
  const std::string locale_;

  // EULA contents that was loaded from file.
  std::string contents_;
};

class ChromeOSCreditsHandler
    : public base::RefCountedThreadSafe<ChromeOSCreditsHandler> {
 public:
  ChromeOSCreditsHandler(const ChromeOSCreditsHandler&) = delete;
  ChromeOSCreditsHandler& operator=(const ChromeOSCreditsHandler&) = delete;

  static void Start(const std::string& path,
                    content::URLDataSource::GotDataCallback callback) {
    scoped_refptr<ChromeOSCreditsHandler> handler(
        new ChromeOSCreditsHandler(path, std::move(callback)));
    handler->StartOnUIThread();
  }

 private:
  friend class base::RefCountedThreadSafe<ChromeOSCreditsHandler>;

  ChromeOSCreditsHandler(const std::string& path,
                         content::URLDataSource::GotDataCallback callback)
      : path_(path), callback_(std::move(callback)) {}

  virtual ~ChromeOSCreditsHandler() {}

  void StartOnUIThread() {
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    if (path_ == kKeyboardUtilsPath) {
      contents_ =
          ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(
              IDR_KEYBOARD_UTILS_JS);
      ResponseOnUIThread();
      return;
    }
    // Load local Chrome OS credits from the disk.
    base::ThreadPool::PostTaskAndReply(
        FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
        base::BindOnce(&ChromeOSCreditsHandler::LoadCreditsFileAsync, this),
        base::BindOnce(&ChromeOSCreditsHandler::ResponseOnUIThread, this));
  }

  void LoadCreditsFileAsync() {
    base::FilePath credits_file_path(chrome::kChromeOSCreditsPath);
    if (!base::ReadFileToString(credits_file_path, &contents_)) {
      // File with credits not found, ResponseOnUIThread will load credits
      // from resources if contents_ is empty.
      contents_.clear();
    }
  }

  void ResponseOnUIThread() {
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    // If we fail to load Chrome OS credits from disk, load it from resources.
    if (contents_.empty() && path_ != kKeyboardUtilsPath) {
      contents_ =
          ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(
              IDR_OS_CREDITS_HTML);
    }
    std::move(callback_).Run(
        base::RefCountedString::TakeString(std::move(contents_)));
  }

  // Path in the URL.
  const std::string path_;

  // Callback to run with the response.
  content::URLDataSource::GotDataCallback callback_;

  // Chrome OS credits contents that was loaded from file.
  std::string contents_;
};

void OnBorealisCreditsLoaded(content::URLDataSource::GotDataCallback callback,
                             std::string credits_html) {
  if (credits_html.empty()) {
    credits_html = l10n_util::GetStringUTF8(IDS_BOREALIS_CREDITS_PLACEHOLDER);
  }
  std::move(callback).Run(
      base::RefCountedString::TakeString(std::move(credits_html)));
}

void HandleBorealisCredits(Profile* profile,
                           content::URLDataSource::GotDataCallback callback) {
  borealis::LoadBorealisCredits(
      profile, base::BindOnce(&OnBorealisCreditsLoaded, std::move(callback)));
}

class CrostiniCreditsHandler
    : public base::RefCountedThreadSafe<CrostiniCreditsHandler> {
 public:
  CrostiniCreditsHandler(const CrostiniCreditsHandler&) = delete;
  CrostiniCreditsHandler& operator=(const CrostiniCreditsHandler&) = delete;

  static void Start(Profile* profile,
                    const std::string& path,
                    content::URLDataSource::GotDataCallback callback) {
    scoped_refptr<CrostiniCreditsHandler> handler(
        new CrostiniCreditsHandler(profile, path, std::move(callback)));
    handler->StartOnUIThread();
  }

 private:
  friend class base::RefCountedThreadSafe<CrostiniCreditsHandler>;

  CrostiniCreditsHandler(Profile* profile,
                         const std::string& path,
                         content::URLDataSource::GotDataCallback callback)
      : path_(path), callback_(std::move(callback)), profile_(profile) {}

  virtual ~CrostiniCreditsHandler() {}

  void StartOnUIThread() {
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    if (path_ == kKeyboardUtilsPath) {
      contents_ =
          ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(
              IDR_KEYBOARD_UTILS_JS);
      RespondOnUIThread();
      return;
    }

    if (crostini::CrostiniFeatures::Get()->IsAllowedNow(profile_)) {
      crostini::CrostiniManager::GetForProfile(profile_)->GetInstallLocation(
          base::BindOnce(&CrostiniCreditsHandler::LoadCredits, this));
    } else {
      RespondWithPlaceholder();
    }
  }

  void LoadCredits(base::FilePath path) {
    if (path.empty()) {
      RespondWithPlaceholder();
      return;
    }

    // Load crostini credits from the disk.
    base::ThreadPool::PostTaskAndReply(
        FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
        base::BindOnce(&CrostiniCreditsHandler::LoadCrostiniCreditsFileAsync,
                       this, path.Append(kTerminaCreditsPath)),
        base::BindOnce(&CrostiniCreditsHandler::RespondOnUIThread, this));
  }

  void LoadCrostiniCreditsFileAsync(base::FilePath credits_file_path) {
    if (!base::ReadFileToString(credits_file_path, &contents_)) {
      // File with credits not found, RespondOnUIThread will load a placeholder
      // if contents_ is empty.
      contents_.clear();
    }
  }

  void RespondWithPlaceholder() {
    contents_.clear();
    RespondOnUIThread();
  }

  void RespondOnUIThread() {
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    // If we fail to load Linux credits from disk, use the placeholder.
    if (contents_.empty() && path_ != kKeyboardUtilsPath) {
      contents_ = l10n_util::GetStringUTF8(IDS_CROSTINI_CREDITS_PLACEHOLDER);
    }
    std::move(callback_).Run(
        base::RefCountedString::TakeString(std::move(contents_)));
  }

  // Path in the URL.
  const std::string path_;

  // Callback to run with the response.
  content::URLDataSource::GotDataCallback callback_;

  // Linux credits contents that was loaded from file.
  std::string contents_;

  Profile* profile_;
};
#endif

}  // namespace

// Individual about handlers ---------------------------------------------------

namespace about_ui {

void AppendHeader(std::string* output, const std::string& unescaped_title) {
  output->append("<!DOCTYPE HTML>\n<html>\n<head>\n");
  output->append("<meta charset='utf-8'>\n");
  output->append("<meta name='color-scheme' content='light dark'>\n");
  if (!unescaped_title.empty()) {
    output->append("<title>");
    output->append(base::EscapeForHTML(unescaped_title));
    output->append("</title>\n");
  }
}

#if BUILDFLAG(IS_CHROMEOS)
// This function returns true if Lacros is the primary browser - or if the
// calling browser is Lacros.
bool isLacrosPrimaryOrCurrentBrowser() {
#if BUILDFLAG(IS_CHROMEOS_ASH)
  return crosapi::browser_util::IsLacrosPrimaryBrowser();
#else
  return true;
#endif
}

void AppendBody(std::string* output) {
  if (isLacrosPrimaryOrCurrentBrowser()) {
    output->append(
        "<link rel='stylesheet' href='chrome://resources/css/os_header.css'>\n"

        "</head>\n<body>\n"

        "<div class='os-link-container-container' id='os-link-container'>\n"
        "<div class='os-link-container'>\n"
        "<span class='os-link-icon'></span>\n"
        "<span aria-hidden='true' id='os-link-desc'>" +
        l10n_util::GetStringUTF8(IDS_ABOUT_OS_TEXT1_LABEL) +
        "</span>\n"
        "<a href='#' id='os-link-href' aria-describedby='os-link-desc'>" +
        l10n_util::GetStringUTF8(IDS_ABOUT_OS_LINK) +
        "</a>\n<span aria-hidden='true'>" +
        l10n_util::GetStringUTF8(IDS_ABOUT_OS_TEXT2_LABEL) +
        "</span>\n</div>\n</div>\n");
  } else {
    output->append("</head>\n<body>\n");
  }
}

void AppendFooter(std::string* output) {
  if (isLacrosPrimaryOrCurrentBrowser()) {
    output->append(
        "<script type='module' src='chrome://resources/js/os_about.js'>"
        "</script>\n");
  }

  output->append("</body>\n</html>\n");
}

#else  // BUILDFLAG(IS_CHROMEOS)

void AppendBody(std::string *output) {
  output->append("</head>\n<body>\n");
}

void AppendFooter(std::string *output) {
  output->append("</body>\n</html>\n");
}

#endif  // BUILDFLAG(IS_CHROMEOS)

}  // namespace about_ui

using about_ui::AppendHeader;
using about_ui::AppendBody;
using about_ui::AppendFooter;

namespace {

std::string ChromeURLs() {
  std::string html;
  AppendHeader(&html, "Chrome URLs");
  AppendBody(&html);

  html += "<h2>List of Chrome URLs</h2>\n<ul>\n";
  std::vector<std::string> hosts(
      chrome::kChromeHostURLs,
      chrome::kChromeHostURLs + chrome::kNumberOfChromeHostURLs);
  std::sort(hosts.begin(), hosts.end());

#if BUILDFLAG(IS_CHROMEOS_ASH)
  const bool is_lacros_primary = about_ui::isLacrosPrimaryOrCurrentBrowser();
  // If Lacros is active, the user can navigate by hand to os:// URL's but
  // internally we will still navigate to chrome:// URL's. Note also that
  // only a subset of URLs might be available in this mode - so we have to
  // make sure that only allowed URLs are being presented.
  if (is_lacros_primary) {
    auto* WebUiControllerFactory = ChromeWebUIControllerFactory::GetInstance();
    for (const std::string& host : hosts) {
      // TODO(crbug/1271718): The refactor should make sure that the provided
      // list can be shown as is without filtering.
      if (WebUiControllerFactory->CanHandleUrl(GURL("os://" + host)) ||
          WebUiControllerFactory->CanHandleUrl(GURL("chrome://" + host))) {
        html +=
            "<li><a href='chrome://" + host + "/'>os://" + host + "</a></li>\n";
      }
    }
  } else {
#else
  {
#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
    for (const std::string& host : hosts) {
      html += "<li><a href='chrome://" + host + "/'>chrome://" + host +
              "</a></li>\n";
    }

    html +=
        "</ul><a id=\"internals\"><h2>List of chrome://internals "
        "pages</h2></a>\n<ul>\n";
    std::vector<std::string> internals_paths(
        chrome::kChromeInternalsPathURLs,
        chrome::kChromeInternalsPathURLs +
            chrome::kNumberOfChromeInternalsPathURLs);
    std::sort(internals_paths.begin(), internals_paths.end());
    for (const std::string& path : internals_paths) {
      html += "<li><a href='chrome://internals/" + path +
              "'>chrome://internals/" + path + "</a></li>\n";
    }
  }

  html += "</ul>\n<h2>For Debug</h2>\n"
      "<p>The following pages are for debugging purposes only. Because they "
      "crash or hang the renderer, they're not linked directly; you can type "
      "them into the address bar if you need them.</p>\n<ul>";
#if BUILDFLAG(IS_CHROMEOS_ASH)
  // If Lacros is active, the user can navigate by hand to os:// URL's but
  // internally we will still navigate to chrome:// URL's. Note also that
  // only a subset of URLs might be available in this mode - so we have to
  // make sure that only allowed URLs are being presented.
  if (is_lacros_primary) {
    auto* WebUiControllerFactory = ChromeWebUIControllerFactory::GetInstance();
    for (size_t i = 0; i < chrome::kNumberOfChromeDebugURLs; i++) {
      // TODO(crbug/1271718): The refactor should make sure that the provided
      // list can be shown as is without filtering.
      const std::string host = GURL(chrome::kChromeDebugURLs[i]).host();
      if (WebUiControllerFactory->CanHandleUrl(GURL("os://" + host)) ||
          WebUiControllerFactory->CanHandleUrl(GURL("chrome://" + host))) {
        html += "<li>os://" + host + "</li>\n";
      }
    }
  } else {
#else
  {
#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
    for (size_t i = 0; i < chrome::kNumberOfChromeDebugURLs; i++)
      html += "<li>" + std::string(chrome::kChromeDebugURLs[i]) + "</li>\n";
  }
  html += "</ul>\n";

  AppendFooter(&html);
  return html;
}

#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_OPENBSD)
std::string AboutLinuxProxyConfig() {
  std::string data;
  AppendHeader(&data,
               l10n_util::GetStringUTF8(IDS_ABOUT_LINUX_PROXY_CONFIG_TITLE));
  data.append("<style>body { max-width: 70ex; padding: 2ex 5ex; }</style>");
  AppendBody(&data);
  base::FilePath binary = base::CommandLine::ForCurrentProcess()->GetProgram();
  data.append(
      l10n_util::GetStringFUTF8(IDS_ABOUT_LINUX_PROXY_CONFIG_BODY,
                                l10n_util::GetStringUTF16(IDS_PRODUCT_NAME),
                                base::ASCIIToUTF16(binary.BaseName().value())));
  AppendFooter(&data);
  return data;
}
#endif

}  // namespace

// AboutUIHTMLSource ----------------------------------------------------------

AboutUIHTMLSource::AboutUIHTMLSource(const std::string& source_name,
                                     Profile* profile)
    : source_name_(source_name),
      profile_(profile) {}

AboutUIHTMLSource::~AboutUIHTMLSource() {}

std::string AboutUIHTMLSource::GetSource() {
  return source_name_;
}

void AboutUIHTMLSource::StartDataRequest(
    const GURL& url,
    const content::WebContents::Getter& wc_getter,
    content::URLDataSource::GotDataCallback callback) {
  // TODO(crbug/1009127): Simplify usages of |path| since |url| is available.
  const std::string path = content::URLDataSource::URLToRequestPath(url);
  std::string response;
  // Add your data source here, in alphabetical order.
  if (source_name_ == chrome::kChromeUIChromeURLsHost) {
    response = ChromeURLs();
  } else if (source_name_ == chrome::kChromeUICreditsHost) {
    int idr = IDR_ABOUT_UI_CREDITS_HTML;
    if (path == kCreditsJsPath)
      idr = IDR_ABOUT_UI_CREDITS_JS;
    else if (path == kCreditsCssPath)
      idr = IDR_ABOUT_UI_CREDITS_CSS;
#if BUILDFLAG(IS_CHROMEOS_ASH)
    else if (path == kKeyboardUtilsPath)
      idr = IDR_KEYBOARD_UTILS_JS;
#endif
    if (idr == IDR_ABOUT_UI_CREDITS_HTML) {
      response = about_ui::GetCredits(true /*include_scripts*/);
    } else {
      response =
          ui::ResourceBundle::GetSharedInstance().LoadDataResourceString(idr);
    }
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_OPENBSD)
  } else if (source_name_ == chrome::kChromeUILinuxProxyConfigHost) {
    response = AboutLinuxProxyConfig();
#endif
#if BUILDFLAG(IS_CHROMEOS_ASH)
  } else if (source_name_ == chrome::kChromeUIOSCreditsHost) {
    ChromeOSCreditsHandler::Start(path, std::move(callback));
    return;
  } else if (source_name_ == chrome::kChromeUICrostiniCreditsHost) {
    CrostiniCreditsHandler::Start(profile(), path, std::move(callback));
    return;
  } else if (source_name_ == chrome::kChromeUIBorealisCreditsHost) {
    HandleBorealisCredits(profile(), std::move(callback));
    return;
#endif
#if !BUILDFLAG(IS_ANDROID)
  } else if (source_name_ == chrome::kChromeUITermsHost) {
#if BUILDFLAG(IS_CHROMEOS_ASH)
    if (!path.empty()) {
      ChromeOSTermsHandler::Start(path, std::move(callback));
      return;
    }
#endif
    response =
        ui::ResourceBundle::GetSharedInstance().LoadLocalizedResourceString(
            IDS_TERMS_HTML);
#endif
  }

  FinishDataRequest(response, std::move(callback));
}

void AboutUIHTMLSource::FinishDataRequest(
    const std::string& html,
    content::URLDataSource::GotDataCallback callback) {
  std::string html_copy(html);
  std::move(callback).Run(
      base::RefCountedString::TakeString(std::move(html_copy)));
}

std::string AboutUIHTMLSource::GetMimeType(const std::string& path) {
  if (path == kCreditsJsPath ||
#if BUILDFLAG(IS_CHROMEOS_ASH)
      path == kKeyboardUtilsPath ||
#endif
      path == kStatsJsPath || path == kStringsJsPath) {
    return "application/javascript";
  }

  if (path == kCreditsCssPath) {
    return "text/css";
  }

  return "text/html";
}

bool AboutUIHTMLSource::ShouldAddContentSecurityPolicy() {
#if BUILDFLAG(IS_CHROMEOS_ASH)
  if (source_name_ == chrome::kChromeUIOSCreditsHost ||
      source_name_ == chrome::kChromeUICrostiniCreditsHost ||
      source_name_ == chrome::kChromeUIBorealisCreditsHost) {
    return false;
  }
#endif
  return content::URLDataSource::ShouldAddContentSecurityPolicy();
}

std::string AboutUIHTMLSource::GetAccessControlAllowOriginForOrigin(
    const std::string& origin) {
#if BUILDFLAG(IS_CHROMEOS_ASH)
  // Allow chrome://oobe to load chrome://terms via XHR.
  if (source_name_ == chrome::kChromeUITermsHost &&
      base::StartsWith(chrome::kChromeUIOobeURL, origin,
                       base::CompareCase::SENSITIVE)) {
    return origin;
  }
#endif
  return content::URLDataSource::GetAccessControlAllowOriginForOrigin(origin);
}

AboutUI::AboutUI(content::WebUI* web_ui, const std::string& name)
    : WebUIController(web_ui) {
  Profile* profile = Profile::FromWebUI(web_ui);

#if !BUILDFLAG(IS_ANDROID)
  // Set up the chrome://theme/ source.
  content::URLDataSource::Add(profile, std::make_unique<ThemeSource>(profile));
#endif

  content::URLDataSource::Add(
      profile, std::make_unique<AboutUIHTMLSource>(name, profile));
}

#if BUILDFLAG(IS_CHROMEOS)

bool AboutUI::OverrideHandleWebUIMessage(const GURL& source_url,
                                         const std::string& message,
                                         const base::Value::List& args) {
  if (message != "crosUrlAboutRedirect")
    return false;

#if BUILDFLAG(IS_CHROMEOS_LACROS)
  lacros_url_handling::NavigateInAsh(GURL(chrome::kOsUIAboutURL));
#else
  // Note: This will only be called by the UI when Lacros is available.
  DCHECK(crosapi::BrowserManager::Get());
  crosapi::BrowserManager::Get()->SwitchToTab(
      GURL(chrome::kChromeUIAboutURL),
      /*path_behavior=*/NavigateParams::RESPECT);
#endif
  return true;
}

#endif  // BUILDFLAG(IS_CHROMEOS)