// Copyright 2018 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/web_applications/web_app_helpers.h"

#include "base/base64.h"
#include "base/feature_list.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/web_applications/web_app.h"
#include "chrome/browser/web_applications/web_app_provider.h"
#include "chrome/browser/web_applications/web_app_registrar.h"
#include "chrome/common/webui_url_constants.h"
#include "components/crx_file/id_util.h"
#include "components/password_manager/content/common/web_ui_constants.h"
#include "components/prefs/pref_service.h"
#include "content/public/common/content_features.h"
#include "crypto/sha2.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/mojom/manifest/manifest.mojom.h"
#include "url/gurl.h"
#include "url/origin.h"
#include "url/url_constants.h"

namespace web_app {

// The following string is used to build the directory name for
// shortcuts to chrome applications (the kind which are installed
// from a CRX).  Application shortcuts to URLs use the {host}_{path}
// for the name of this directory.  Hosts can't include an underscore.
// By starting this string with an underscore, we ensure that there
// are no naming conflicts.
const char kCrxAppPrefix[] = "_crx_";

std::string GenerateApplicationNameFromURL(const GURL& url) {
  return base::StrCat({url.host_piece(), "_", url.path_piece()});
}

std::string GenerateApplicationNameFromAppId(const AppId& app_id) {
  std::string t(kCrxAppPrefix);
  t.append(app_id);
  return t;
}

AppId GetAppIdFromApplicationName(const std::string& app_name) {
  std::string prefix(kCrxAppPrefix);
  if (app_name.substr(0, prefix.length()) != prefix)
    return std::string();
  return app_name.substr(prefix.length());
}

AppId GenerateAppIdFromManifestId(const ManifestId& manifest_id) {
  // The app ID is hashed twice: here and in GenerateId.
  // The double-hashing is for historical reasons and it needs to stay
  // this way for backwards compatibility. (Back then, a web app's input to the
  // hash needed to be formatted like an extension public key.)
  return crx_file::id_util::GenerateId(
      crypto::SHA256HashString(manifest_id.spec()));
}

AppId GenerateAppId(const absl::optional<std::string>& manifest_id_path,
                    const GURL& start_url) {
  if (!manifest_id_path) {
    return GenerateAppIdFromManifestId(
        GenerateManifestIdFromStartUrlOnly(start_url));
  }
  return GenerateAppIdFromManifestId(
      GenerateManifestId(manifest_id_path.value(), start_url));
}

ManifestId GenerateManifestId(const std::string& manifest_id_path,
                              const GURL& start_url) {
  // When manifest_id is specified, the app id is generated from
  // <start_url_origin>/<manifest_id_path>.
  // Note: start_url.DeprecatedGetOriginAsURL().spec() returns the origin ending
  // with slash.
  GURL app_id(start_url.DeprecatedGetOriginAsURL().spec() + manifest_id_path);
  CHECK(app_id.is_valid()) << "start_url: " << start_url
                           << ", manifest_id = " << manifest_id_path;
  return app_id.GetWithoutRef();
}

AppId GenerateAppIdFromManifest(const blink::mojom::Manifest& manifest) {
  CHECK(manifest.id.is_valid());
  return GenerateAppIdFromManifestId(manifest.id);
}

ManifestId GenerateManifestIdFromStartUrlOnly(const GURL& start_url) {
  CHECK(start_url.is_valid()) << start_url.spec();
  return start_url.GetWithoutRef();
}

bool IsValidWebAppUrl(const GURL& app_url) {
  if (app_url.is_empty() || app_url.inner_url())
    return false;

  // TODO(crbug.com/1253234): Remove chrome-extension scheme.
  return app_url.SchemeIs(url::kHttpScheme) ||
         app_url.SchemeIs(url::kHttpsScheme) ||
         app_url.SchemeIs("chrome-extension") ||
         (app_url.SchemeIs("chrome") &&
          (app_url.host() == password_manager::kChromeUIPasswordManagerHost));
}

absl::optional<AppId> FindInstalledAppWithUrlInScope(Profile* profile,
                                                     const GURL& url,
                                                     bool window_only) {
  auto* provider = WebAppProvider::GetForLocalAppsUnchecked(profile);
  return provider ? provider->registrar_unsafe().FindInstalledAppWithUrlInScope(
                        url, window_only)
                  : absl::nullopt;
}

bool IsNonLocallyInstalledAppWithUrlInScope(Profile* profile, const GURL& url) {
  auto* provider = WebAppProvider::GetForWebApps(profile);
  return provider ? provider->registrar_unsafe()
                        .IsNonLocallyInstalledAppWithUrlInScope(url)
                  : false;
}

bool LooksLikePlaceholder(const WebApp& app) {
  for (const auto& [install_source, config] :
       app.management_to_external_config_map()) {
    if (config.is_placeholder) {
      return true;
    }
    for (const GURL& install_url : config.install_urls) {
      if (app.untranslated_name() == install_url.spec()) {
        return true;
      }
    }
  }
  return false;
}

}  // namespace web_app