////  ScriptCache.cpp//  libraries/script-engine/src////  Created by Brad Hefta-Gaub on 2015-03-30//  Copyright 2015 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include <QCoreApplication>#include <QEventLoop>#include <QNetworkAccessManager>#include <QNetworkConfiguration>#include <QNetworkReply>#include <QObject> #include <NetworkAccessManager.h>#include <SharedUtil.h>#include "ScriptEngineLogging.h"#include "ScriptCache.h" ScriptCache::ScriptCache(QObject* parent) {    // nothing to do here...} QString ScriptCache::getScript(const QUrl& url, ScriptUser* scriptUser, bool& isPending) {    QString scriptContents;    if (_scriptCache.contains(url)) {        qCDebug(scriptengine) << "Found script in cache:" << url.toString();        scriptContents = _scriptCache[url];        scriptUser->scriptContentsAvailable(url, scriptContents);        isPending = false;    } else {        isPending = true;        bool alreadyWaiting = _scriptUsers.contains(url);        _scriptUsers.insert(url, scriptUser);         if (alreadyWaiting) {            qCDebug(scriptengine) << "Already downloading script at:" << url.toString();        } else {            QNetworkAccessManager& networkAccessManager = NetworkAccessManager::getInstance();            QNetworkRequest networkRequest = QNetworkRequest(url);            networkRequest.setHeader(QNetworkRequest::UserAgentHeader, HIGH_FIDELITY_USER_AGENT);             qCDebug(scriptengine) << "Downloading script at:" << url.toString();            QNetworkReply* reply = networkAccessManager.get(networkRequest);            connect(reply, &QNetworkReply::finished, this, &ScriptCache::scriptDownloaded);        }    }    return scriptContents;} void ScriptCache::deleteScript(const QUrl& url) {    if (_scriptCache.contains(url)) {        qCDebug(scriptengine) << "Delete script from cache:" << url.toString();        _scriptCache.remove(url);    }} void ScriptCache::scriptDownloaded() {    QNetworkReply* reply = qobject_cast<QNetworkReply*>(sender());    QUrl url = reply->url();    QList<ScriptUser*> scriptUsers = _scriptUsers.values(url);    _scriptUsers.remove(url);     if (reply->error() == QNetworkReply::NoError && reply->attribute(QNetworkRequest::HttpStatusCodeAttribute) == 200) {        _scriptCache[url] = reply->readAll();        qCDebug(scriptengine) << "Done downloading script at:" << url.toString();         foreach(ScriptUser* user, scriptUsers) {            user->scriptContentsAvailable(url, _scriptCache[url]);        }    } else {        qCWarning(scriptengine) << "Error loading script from URL " << reply->url().toString()            << "- HTTP status code is" << reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt()            << "and error from QNetworkReply is" << reply->errorString();        foreach(ScriptUser* user, scriptUsers) {            user->errorInLoadingScript(url);        }    }    reply->deleteLater();}