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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 "components/supervised_user/core/browser/supervised_user_utils.h"
#include <optional>
#include <string>
#include <variant>
#include <vector>
#include "base/base64.h"
#include "base/base64url.h"
#include "base/logging.h"
#include "base/notreached.h"
#include "base/strings/strcat.h"
#include "base/strings/utf_string_conversions.h"
#include "components/prefs/pref_service.h"
#include "components/signin/public/identity_manager/identity_manager.h"
#include "components/strings/grit/components_strings.h"
#include "components/supervised_user/core/browser/proto/parent_access_callback.pb.h"
#include "components/supervised_user/core/browser/proto/transaction_data.pb.h"
#include "components/supervised_user/core/browser/supervised_user_log_record.h"
#include "components/supervised_user/core/common/features.h"
#include "components/supervised_user/core/common/pref_names.h"
#include "components/supervised_user/core/common/supervised_user_constants.h"
#include "components/url_formatter/url_formatter.h"
#include "components/url_matcher/url_util.h"
#include "net/base/url_util.h"
#include "ui/base/l10n/l10n_util.h"
#include "url/gurl.h"
namespace supervised_user {
namespace {
// Url query param returned from the PACP widget with an encoded parent approval
// result.
constexpr char kParentAccessResultQueryParameter[] = "result";
// Url that contains the approval result in PACP parent approval requests.
constexpr char kPacpOriginUrlHost[] = "families.google.com";
#if BUILDFLAG(IS_IOS) || BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC) || \
BUILDFLAG(IS_WIN)
// Returns the text that will be shown as the PACP widget subtitle, containing
// information about the blocked hostname and the blocking reason.
std::string GetBlockingReasonSubtitle(
const std::u16string& blocked_hostname,
supervised_user::FilteringBehaviorReason filtering_reason) {
int message_id = 0;
switch (filtering_reason) {
case FilteringBehaviorReason::DEFAULT:
message_id = IDS_PARENT_WEBSITE_APPROVAL_BLOCK_ALL_URL;
break;
case FilteringBehaviorReason::ASYNC_CHECKER:
message_id = IDS_PARENT_WEBSITE_APPROVAL_SAFE_SITES_URL;
break;
case FilteringBehaviorReason::MANUAL:
message_id = IDS_PARENT_WEBSITE_APPROVAL_MANUAL_URL;
break;
case FilteringBehaviorReason::FILTER_DISABLED:
NOTREACHED() << "No blocking reason when the filter is disabled";
}
return l10n_util::GetStringFUTF8(message_id, blocked_hostname);
}
// Returns a base64-encoded `TransactionData` proto message that encapsulates
// the blocked url so that PACP can consume it.
std::string GetBase64EncodedInTransactionalDataForPayload(
const std::u16string& blocked_hostname,
supervised_user::FilteringBehaviorReason filtering_reason) {
static constexpr char kPacpUrlPayloadMessageType[] =
"type.googleapis.com/"
"kids.platform.parentaccess.ui.common.proto.LocalApprovalPayload";
CHECK(!blocked_hostname.empty());
kids::platform::parentaccess::proto::LocalApprovalPayload approval_url;
approval_url.set_url_approval_context(
GetBlockingReasonSubtitle(blocked_hostname, filtering_reason));
kids::platform::parentaccess::proto::TransactionData transaction_data;
transaction_data.mutable_payload()->set_value(
approval_url.SerializeAsString());
transaction_data.mutable_payload()->set_type_url(kPacpUrlPayloadMessageType);
std::string base_64_url_encoded_data;
base::Base64UrlEncode(transaction_data.SerializeAsString(),
base::Base64UrlEncodePolicy::INCLUDE_PADDING,
&base_64_url_encoded_data);
CHECK_GT(base_64_url_encoded_data.length(), 0UL);
return base_64_url_encoded_data;
}
#endif // BUILDFLAG(IS_IOS) || BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC) ||
// BUILDFLAG(IS_WIN)
} // namespace
ParentAccessCallbackParsedResult::ParentAccessCallbackParsedResult(
ParentAccessWidgetError error)
: result_(error) {}
ParentAccessCallbackParsedResult::ParentAccessCallbackParsedResult(
kids::platform::parentaccess::client::proto::ParentAccessCallback callback)
: result_(callback) {}
ParentAccessCallbackParsedResult::~ParentAccessCallbackParsedResult() = default;
std::optional<ParentAccessWidgetError>
ParentAccessCallbackParsedResult::GetError() const {
if (std::holds_alternative<ParentAccessWidgetError>(result_)) {
return std::get<ParentAccessWidgetError>(result_);
}
return std::nullopt;
}
std::optional<kids::platform::parentaccess::client::proto::ParentAccessCallback>
ParentAccessCallbackParsedResult::GetCallback() const {
if (std::holds_alternative<
kids::platform::parentaccess::client::proto::ParentAccessCallback>(
result_)) {
return std::get<
kids::platform::parentaccess::client::proto::ParentAccessCallback>(
result_);
}
return std::nullopt;
}
// static
ParentAccessCallbackParsedResult
ParentAccessCallbackParsedResult::ParseParentAccessCallbackResult(
const std::string& encoded_parent_access_callback_proto) {
std::string decoded_parent_access_callback;
if (!base::Base64UrlDecode(encoded_parent_access_callback_proto,
base::Base64UrlDecodePolicy::IGNORE_PADDING,
&decoded_parent_access_callback)) {
LOG(ERROR) << "ParentAccessHandler::ParentAccessResult: Error decoding "
"parent_access_result from base64";
return ParentAccessCallbackParsedResult(
ParentAccessWidgetError::kDecodingError);
}
kids::platform::parentaccess::client::proto::ParentAccessCallback
parent_access_callback;
if (!parent_access_callback.ParseFromString(decoded_parent_access_callback)) {
LOG(ERROR) << "ParentAccessHandler::ParentAccessResult: Error parsing "
"decoded_parent_access_result to proto";
return ParentAccessCallbackParsedResult(
ParentAccessWidgetError::kParsingError);
}
return ParentAccessCallbackParsedResult(parent_access_callback);
}
std::optional<std::string> MaybeGetPacpResultFromUrl(const GURL& url) {
std::string result_value;
bool contains_result_query_param = net::GetValueForKeyInQuery(
url,
/*search_key=*/kParentAccessResultQueryParameter,
/*out_value=*/&result_value);
if (!url.GetHost().starts_with(kPacpOriginUrlHost) ||
!contains_result_query_param) {
return std::nullopt;
}
return result_value;
}
std::string FamilyRoleToString(kidsmanagement::FamilyRole role) {
switch (role) {
case kidsmanagement::CHILD:
return "child";
case kidsmanagement::MEMBER:
return "member";
case kidsmanagement::PARENT:
return "parent";
case kidsmanagement::HEAD_OF_HOUSEHOLD:
return "family_manager";
default:
// Keep the previous semantics - other values were not allowed.
NOTREACHED();
}
}
GURL NormalizeUrl(const GURL& url) {
GURL effective_url = url_matcher::util::GetEmbeddedURL(url);
if (!effective_url.is_valid()) {
effective_url = url;
}
return url_matcher::util::Normalize(effective_url);
}
#if BUILDFLAG(IS_IOS) || BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC) || \
BUILDFLAG(IS_WIN)
GURL GetParentAccessURL(
const std::string& locale,
const GURL& blocked_url,
supervised_user::FilteringBehaviorReason filtering_reason) {
// Parent Access widget constants, used in the local web approval
// flow.
// URL hosting the Parent Access widget.
static constexpr char kBaseUrl[] = "https://families.google.com/parentaccess";
// URL to which the Parent Access widget redirects on approval.
static constexpr char kContinueUrl[] = "https://families.google.com";
// Caller Ids for Desktop and iOS platforms.
#if BUILDFLAG(IS_IOS)
static constexpr char kCallerId[] = "qSTnVRdQ";
#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_WIN)
static constexpr char kCallerId[] = "clwAA5XJ";
#endif // BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_WIN)
GURL url(kBaseUrl);
GURL::Replacements replacements;
std::string query = base::StrCat(
{"callerid=", kCallerId, "&hl=", locale, "&continue=", kContinueUrl});
if (base::FeatureList::IsEnabled(
kLocalWebApprovalsWidgetSupportsUrlPayload) &&
!blocked_url.GetHost().empty()) {
// Prepare blocked URL hostname for user-friendly display, including
// internationalized domain name (IDN) conversion if necessary.
std::u16string blocked_hostname = url_formatter::FormatUrl(
blocked_url,
url_formatter::kFormatUrlOmitHTTP | url_formatter::kFormatUrlOmitHTTPS |
url_formatter::kFormatUrlOmitDefaults,
base::UnescapeRule::SPACES, nullptr, nullptr, nullptr);
query += base::StrCat(
{"&transaction-data=", GetBase64EncodedInTransactionalDataForPayload(
blocked_hostname, filtering_reason)});
}
replacements.SetQueryStr(query);
return url.ReplaceComponents(replacements);
}
#endif // BUILDFLAG(IS_IOS) || BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC) ||
// BUILDFLAG(IS_WIN)
} // namespace supervised_user
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