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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "components/translate/ios/browser/translate_controller.h"
#include <cmath>
#include <string_view>
#include <utility>
#import "base/check_op.h"
#import "base/functional/bind.h"
#import "base/functional/callback_helpers.h"
#import "base/json/string_escape.h"
#import "base/strings/utf_string_conversions.h"
#import "base/values.h"
#import "components/translate/core/common/translate_util.h"
#import "components/translate/ios/browser/translate_java_script_feature.h"
#import "ios/web/public/browser_state.h"
#import "ios/web/public/js_messaging/web_frame.h"
#import "ios/web/public/js_messaging/web_frames_manager.h"
#import "ios/web/public/navigation/navigation_context.h"
#import "net/base/load_flags.h"
#import "net/base/net_errors.h"
#import "net/http/http_status_code.h"
#import "net/traffic_annotation/network_traffic_annotation.h"
#import "services/network/public/cpp/resource_request.h"
#import "services/network/public/mojom/url_response_head.mojom.h"
#import "url/gurl.h"
namespace translate {
namespace {
// Extracts a TranslateErrors value from `value` for the given `key`. Returns
// std::nullopt if the value is missing or not convertible to TranslateErrors.
std::optional<TranslateErrors> FindTranslateErrorsKey(
const base::Value::Dict& value,
std::string_view key) {
// Does `value` contains a double value for `key`?
const std::optional<double> found_value = value.FindDouble(key);
if (!found_value.has_value())
return std::nullopt;
// Does the double value convert to an integral value? This is to reject
// values like `1.3` that do not represent an enumerator.
const double double_value = found_value.value();
if (double_value != std::trunc(double_value))
return std::nullopt;
// Is the value in range? It is safe to convert the enumerator values to
// `double` as IEEE754 floating point can safely represent all integral
// values below 2**53 as they have 53 bits for the mantissa.
constexpr double kMinValue = static_cast<double>(TranslateErrors::NONE);
constexpr double kMaxValue = static_cast<double>(TranslateErrors::TYPE_LAST);
if (double_value < kMinValue || kMaxValue < double_value)
return std::nullopt;
// Since `double_value` has no fractional part, is in range for the
// enumeration and the enumeration has no holes between enumerators,
// it is safe to cast the value to the enumeration.
return static_cast<TranslateErrors>(double_value);
}
} // anonymous namespace
TranslateController::TranslateController(web::WebState* web_state)
: web_state_(web_state), observer_(nullptr) {
DCHECK(web_state_);
}
TranslateController::~TranslateController() {}
web::WebFrame* TranslateController::GetMainWebFrame() {
return TranslateJavaScriptFeature::GetInstance()
->GetWebFramesManager(web_state_)
->GetMainWebFrame();
}
void TranslateController::InjectTranslateScript(
const std::string& translate_script) {
web::WebFrame* main_web_frame = GetMainWebFrame();
if (main_web_frame) {
TranslateJavaScriptFeature::GetInstance()->InjectTranslateScript(
main_web_frame, translate_script);
}
}
void TranslateController::RevertTranslation() {
web::WebFrame* main_web_frame = GetMainWebFrame();
if (main_web_frame) {
TranslateJavaScriptFeature::GetInstance()->RevertTranslation(
main_web_frame);
}
}
void TranslateController::StartTranslation(const std::string& source_language,
const std::string& target_language) {
web::WebFrame* main_web_frame = GetMainWebFrame();
if (main_web_frame) {
TranslateJavaScriptFeature::GetInstance()->StartTranslation(
main_web_frame, source_language, target_language);
}
}
void TranslateController::OnJavascriptCommandReceived(
const base::Value::Dict& payload) {
const std::string* command = payload.FindString("command");
if (!command) {
return;
}
if (*command == "ready") {
OnTranslateReady(payload);
} else if (*command == "status") {
OnTranslateComplete(payload);
}
}
void TranslateController::OnTranslateReady(const base::Value::Dict& payload) {
std::optional<TranslateErrors> error_type =
FindTranslateErrorsKey(payload, "errorCode");
if (!error_type.has_value())
return;
std::optional<double> load_time;
std::optional<double> ready_time;
if (*error_type == TranslateErrors::NONE) {
load_time = payload.FindDouble("loadTime");
ready_time = payload.FindDouble("readyTime");
if (!load_time.has_value() || !ready_time.has_value()) {
return;
}
}
if (observer_) {
observer_->OnTranslateScriptReady(*error_type, load_time.value_or(0.),
ready_time.value_or(0.));
}
}
void TranslateController::OnTranslateComplete(
const base::Value::Dict& payload) {
std::optional<TranslateErrors> error_type =
FindTranslateErrorsKey(payload, "errorCode");
if (!error_type.has_value())
return;
const std::string* source_language = nullptr;
std::optional<double> translation_time;
if (*error_type == TranslateErrors::NONE) {
source_language = payload.FindString("pageSourceLanguage");
translation_time = payload.FindDouble("translationTime");
if (!source_language || !translation_time.has_value()) {
return;
}
}
if (observer_) {
observer_->OnTranslateComplete(
*error_type, source_language ? *source_language : std::string(),
translation_time.value_or(0.));
}
}
} // namespace translate
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