MetaGer.php

<?php
namespace App;

use App;
use Cache;
use Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Redis;
use Jenssegers\Agent\Agent;
use LaravelLocalization;
use Log;
use Predis\Connection\ConnectionException;

class MetaGer
{
    # Einstellungen für die Suche
    protected $fokus;
    protected $eingabe;
    protected $q;
    protected $page;
    protected $lang;
    protected $cache = "";
    protected $site;
    protected $time = 2000;
    protected $hostBlacklist = [];
    protected $domainBlacklist = [];
    private $urlBlacklist = [];
    protected $stopWords = [];
    protected $phrases = [];
    protected $engines = [];
    protected $totalResults = 0;
    protected $results = [];
    protected $queryFilter = [];
    protected $parameterFilter = [];
    protected $ads = [];
    protected $warnings = [];
    protected $errors = [];
    protected $addedHosts = [];
    protected $availableFoki = [];
    protected $startCount = 0;
    protected $canCache = false;
    # Daten über die Abfrage$
    protected $ip;
    protected $useragent;
    protected $language;
    protected $agent;
    protected $apiKey = "";
    protected $apiAuthorized = false;
    # Konfigurationseinstellungen:
    protected $sumaFile;
    protected $mobile;
    protected $resultCount;
    protected $sprueche;
    protected $newtab;
    protected $domainsBlacklisted = [];
    protected $urlsBlacklisted = [];
    protected $url;
    protected $fullUrl;
    protected $languageDetect;
    protected $verificationId;
    protected $verificationCount;

    public function __construct()
    {
        # Timer starten
        $this->starttime = microtime(true);
        # Versuchen Blacklists einzulesen
        if (file_exists(config_path() . "/blacklistDomains.txt") && file_exists(config_path() . "/blacklistUrl.txt")) {
            $tmp = file_get_contents(config_path() . "/blacklistDomains.txt");
            $this->domainsBlacklisted = explode("\n", $tmp);
            $tmp = file_get_contents(config_path() . "/blacklistUrl.txt");
            $this->urlsBlacklisted = explode("\n", $tmp);
        } else {
            Log::warning("Achtung: Eine, oder mehrere Blacklist Dateien, konnten nicht geöffnet werden");
        }

        # Parser Skripte einhängen
        $dir = app_path() . "/Models/parserSkripte/";
        foreach (scandir($dir) as $filename) {
            $path = $dir . $filename;
            if (is_file($path)) {
                require_once $path;
            }
        }

        # Cachebarkeit testen
        try {
            Cache::has('test');
            $this->canCache = true;
        } catch (ConnectionException $e) {
            $this->canCache = false;
        }
    }

    # Erstellt aus den gesammelten Ergebnissen den View
    public function createView($quicktipResults = [])
    {
        # Hiermit werden die evtl. ausgewählten SuMas extrahiert, damit die Input-Boxen richtig gesetzt werden können
        $focusPages = [];

        foreach ($this->request->all() as $key => $value) {
            if (starts_with($key, 'engine_') && $value === 'on') {
                $focusPages[] = $key;
            }
        }

        $viewResults = [];
        # Wir extrahieren alle notwendigen Variablen und geben Sie an unseren View:
        foreach ($this->results as $result) {
            $viewResults[] = get_object_vars($result);
        }
        # Wir müssen natürlich noch den Log für die durchgeführte Suche schreiben:
        $this->createLogs();
        if ($this->fokus === "bilder") {
            switch ($this->out) {
                case 'results':
                    return view('resultpages.results_images')
                        ->with('results', $viewResults)
                        ->with('eingabe', $this->eingabe)
                        ->with('mobile', $this->mobile)
                        ->with('warnings', $this->warnings)
                        ->with('errors', $this->errors)
                        ->with('apiAuthorized', $this->apiAuthorized)
                        ->with('metager', $this)
                        ->with('browser', (new Agent())->browser());
                default:
                    return view('resultpages.resultpage_images')
                        ->with('results', $viewResults)
                        ->with('eingabe', $this->eingabe)
                        ->with('mobile', $this->mobile)
                        ->with('warnings', $this->warnings)
                        ->with('errors', $this->errors)
                        ->with('apiAuthorized', $this->apiAuthorized)
                        ->with('metager', $this)
                        ->with('browser', (new Agent())->browser())
                        ->with('quicktips', $quicktipResults)
                        ->with('focus', $this->fokus)
                        ->with('resultcount', count($this->results));
            }
        } else {
            switch ($this->out) {
                case 'results':
                    return view('resultpages.results')
                        ->with('results', $viewResults)
                        ->with('eingabe', $this->eingabe)
                        ->with('mobile', $this->mobile)
                        ->with('warnings', $this->warnings)
                        ->with('errors', $this->errors)
                        ->with('apiAuthorized', $this->apiAuthorized)
                        ->with('metager', $this)
                        ->with('browser', (new Agent())->browser())
                        ->with('fokus', $this->fokus);
                    break;
                case 'results-with-style':
                    return view('resultpages.resultpage')
                        ->with('results', $viewResults)
                        ->with('eingabe', $this->eingabe)
                        ->with('mobile', $this->mobile)
                        ->with('warnings', $this->warnings)
                        ->with('errors', $this->errors)
                        ->with('apiAuthorized', $this->apiAuthorized)
                        ->with('metager', $this)
                        ->with('suspendheader', "yes")
                        ->with('browser', (new Agent())->browser())
                        ->with('fokus', $this->fokus);
                    break;
                case 'rich':
                    return view('resultpages.metager3rich')
                        ->with('results', $viewResults)
                        ->with('eingabe', $this->eingabe)
                        ->with('mobile', $this->mobile)
                        ->with('warnings', $this->warnings)
                        ->with('errors', $this->errors)
                        ->with('apiAuthorized', $this->apiAuthorized)
                        ->with('metager', $this)
                        ->with('browser', (new Agent())->browser())
                        ->with('fokus', $this->fokus);
                    break;
                case 'rss20':
                    return view('resultpages.metager3resultsrss20')
                        ->with('results', $viewResults)
                        ->with('eingabe', $this->eingabe)
                        ->with('apiAuthorized', $this->apiAuthorized)
                        ->with('metager', $this)
                        ->with('resultcount', sizeof($viewResults))
                        ->with('fokus', $this->fokus);
                    break;
                case 'api':
                    return response()->view('resultpages.metager3resultsatom10', ['results' => $viewResults, 'eingabe' => $this->eingabe, 'metager' => $this, 'resultcount' => sizeof($viewResults), 'apiAuthorized' => $this->apiAuthorized])->header('Content-Type', 'application/xml');
                    break;
                case 'atom10':
                    return response()->view('resultpages.metager3resultsatom10', ['results' => $viewResults, 'eingabe' => $this->eingabe, 'metager' => $this, 'resultcount' => sizeof($viewResults), 'apiAuthorized' => true])
                        ->header('Content-Type', 'application/xml');
                    break;
                case 'result-count':
                    # Wir geben die Ergebniszahl und die benötigte Zeit zurück:
                    return sizeof($viewResults) . ";" . round((microtime(true) - $this->starttime), 2);
                    break;
                default:
                    return view('resultpages.resultpage')
                        ->with('eingabe', $this->eingabe)
                        ->with('focusPages', $focusPages)
                        ->with('mobile', $this->mobile)
                        ->with('warnings', $this->warnings)
                        ->with('errors', $this->errors)
                        ->with('apiAuthorized', $this->apiAuthorized)
                        ->with('metager', $this)
                        ->with('browser', (new Agent())->browser())
                        ->with('quicktips', $quicktipResults)
                        ->with('resultcount', count($this->results))
                        ->with('focus', $this->fokus);
                    break;
            }
        }
    }

    public function prepareResults()
    {
        $engines = $this->engines;

        // combine
        $combinedResults = $this->combineResults($engines);

        # Wir bestimmen die Sprache eines jeden Suchergebnisses
        $this->results = $this->addLangCodes($this->results);

        // sort
        //$sortedResults = $this->sortResults($engines);
        // filter
        // augment (boost&adgoal)
        // authorize
        if ($this->apiKey) {
            $this->apiAuthorized = $this->authorize($this->apiKey);
        }
        // misc (WiP)
        if ($this->fokus == "nachrichten") {
            $this->results = array_filter($this->results, function ($v, $k) {
                return !is_null($v->getRank());
            }, ARRAY_FILTER_USE_BOTH);
            uasort($this->results, function ($a, $b) {
                $datea = $a->getDate();
                $dateb = $b->getDate();
                return $dateb - $datea;
            });
        } else {
            uasort($this->results, function ($a, $b) {
                if ($a->getRank() == $b->getRank()) {
                    return 0;
                }

                return ($a->getRank() < $b->getRank()) ? 1 : -1;
            });
        }

        # Validate Results
        $newResults = [];
        foreach ($this->results as $result) {
            if ($result->isValid($this)) {
                $newResults[] = $result;
            }

        }
        $this->results = $newResults;

        #Adgoal Implementation
        if (!$this->apiAuthorized) {
            $this->results = $this->parseAdgoal($this->results);
        }

        # Human Verification
        $this->results = $this->humanVerification($this->results);
        $this->ads = $this->humanVerification($this->ads);

        $counter = 0;
        $firstRank = 0;

        if (isset($this->startForwards)) {
            $this->startCount = $this->startForwards;
        } elseif (isset($this->startBackwards)) {
            $this->startCount = $this->startBackwards - count($this->results) - 1;
        } else {
            $this->startCount = 0;
        }

        foreach ($this->results as $result) {
            if ($counter === 0) {
                $firstRank = $result->rank;
            }

            $counter++;
            $result->number = $counter + $this->startCount;
            $confidence = 0;
            if ($firstRank > 0) {
                $confidence = $result->rank / $firstRank;
            } else {
                $confidence = 0;
            }

            if ($confidence > 0.65) {
                $result->color = "#FF4000";
            } elseif ($confidence > 0.4) {
                $result->color = "#FF0080";
            } elseif ($confidence > 0.2) {
                $result->color = "#C000C0";
            } else {
                $result->color = "#000000";
            }

        }

        if (count($this->results) <= 0) {
            if (strlen($this->site) > 0) {
                $no_sitesearch_query = str_replace(urlencode("site:" . $this->site), "", $this->fullUrl);
                $this->errors[] = trans('metaGer.results.failedSitesearch', ['altSearch' => $no_sitesearch_query]);
            } else {
                $this->errors[] = trans('metaGer.results.failed');
            }
        }

        if ($this->canCache() && isset($this->next) && count($this->next) > 0 && count($this->results) > 0) {
            $page = $this->page + 1;
            $this->next = [
                'page' => $page,
                'startForwards' => $this->results[count($this->results) - 1]->number,
                'engines' => $this->next,
            ];
            Cache::put(md5(serialize($this->next)), serialize($this->next), 60);
        } else {
            $this->next = [];
        }

    }

    private function addLangCodes($results)
    {
        # Wenn es keine Ergebnisse gibt, brauchen wir uns gar nicht erst zu bemühen
        if (sizeof($results) === 0) {
            return $results;
        }

        # Bei der Spracheinstellung "all" wird nicht gefiltert
        if ($this->getLang() === "all") {
            return $results;
        } else {
            # Ansonsten müssen wir jedem Result einen Sprachcode hinzufügen
            $id = 0;
            $langStrings = [];
            foreach ($results as $result) {
                # Wir geben jedem Ergebnis eine ID um später die Sprachcodes zuordnen zu können
                $result->id = $id;

                $langStrings["result_" . $id] = utf8_encode($result->getLangString());

                $id++;
            }
            # Wir schreiben die Strings in eine temporäre JSON-Datei,
            # Da das Array unter umständen zu groß ist für eine direkte Übergabe an das Skript
            $filename = "/tmp/" . getmypid();
            file_put_contents($filename, json_encode($langStrings));
            $langDetectorPath = app_path() . "/Models/lang.pl";
            $lang = exec("echo '$filename' | $langDetectorPath");
            $lang = json_decode($lang, true);

            # Wir haben nun die Sprachcodes der einzelnen Ergebnisse.
            # Diese müssen wir nur noch korrekt zuordnen, dann sind wir fertig.
            foreach ($lang as $key => $langCode) {
                # Prefix vom Key entfernen:
                $id = intval(str_replace("result_", "", $key));
                foreach ($this->results as $result) {
                    if ($result->id === $id) {
                        $result->langCode = $langCode;
                        break;
                    }
                }
            }
            return $results;
        }
    }

    public function combineResults($engines)
    {
        foreach ($engines as $engine) {
            if (isset($engine->next)) {
                $this->next[] = $engine->next;
            }
            if (isset($engine->last)) {
                $this->last[] = $engine->last;
            }
            foreach ($engine->results as $result) {
                if ($result->valid) {
                    $this->results[] = $result;
                }
            }
            foreach ($engine->ads as $ad) {
                $this->ads[] = $ad;
            }
        }
    }

    public function parseAdgoal($results)
    {
        $publicKey = getenv('adgoal_public');
        $privateKey = getenv('adgoal_private');
        if ($publicKey === false) {
            return $results;
        }
        $tldList = "";
        try {
            foreach ($results as $result) {
                $link = $result->anzeigeLink;
                if (strpos($link, "http") !== 0) {
                    $link = "http://" . $link;
                }
                $tldList .= parse_url($link, PHP_URL_HOST) . ",";
                $result->tld = parse_url($link, PHP_URL_HOST);
            }
            $tldList = rtrim($tldList, ",");

            # Hashwert
            $hash = md5("meta" . $publicKey . $tldList . "GER");

            # Query
            $query = urlencode($this->q);

            $link = "https://api.smartredirect.de/api_v2/CheckForAffiliateUniversalsearchMetager.php?p=" . $publicKey . "&k=" . $hash . "&tld=" . $tldList . "&q=" . $query;
            $answer = json_decode(file_get_contents($link));

            # Nun müssen wir nur noch die Links für die Advertiser ändern:
            foreach ($answer as $el) {
                $hoster = $el[0];
                $hash = $el[1];

                foreach ($results as $result) {
                    if ($hoster === $result->tld && !$result->partnershop) {
                        # Hier ist ein Advertiser:
                        # Das Logo hinzufügen:
                        if ($result->image !== "") {
                            $result->logo = "https://img.smartredirect.de/logos_v2/60x30/" . $hash . ".gif";
                        } else {
                            $result->image = "https://img.smartredirect.de/logos_v2/120x60/" . $hash . ".gif";
                        }

                        # Den Link hinzufügen:
                        $publicKey = $publicKey;
                        $targetUrl = $result->anzeigeLink;
                        if (strpos($targetUrl, "http") !== 0) {
                            $targetUrl = "http://" . $targetUrl;
                        }

                        $gateHash = md5($targetUrl . $privateKey);
                        $newLink = "https://api.smartredirect.de/api_v2/ClickGate.php?p=" . $publicKey . "&k=" . $gateHash . "&url=" . urlencode($targetUrl) . "&q=" . $query;
                        $result->link = $newLink;
                        $result->partnershop = true;
                    }
                }
            }
        } catch (\ErrorException $e) {
            return $results;
        }

        return $results;
    }

    public function humanVerification($results)
    {
        # Let's check if we need to implement a redirect for human verification
        if ($this->verificationCount > 10) {
            foreach ($results as $result) {
                $link = $result->link;
                $day = Carbon::now()->day;
                $pw = md5($this->verificationId . $day . $link . env("PROXY_PASSWORD"));
                $url = route('humanverification', ['mm' => $this->verificationId, 'pw' => $pw, "url" => urlencode(str_replace("/", "<<SLASH>>", base64_encode($link)))]);
                $proxyPw = md5($this->verificationId . $day . $result->proxyLink . env("PROXY_PASSWORD"));
                $proxyUrl = route('humanverification', ['mm' => $this->verificationId, 'pw' => $proxyPw, "url" => urlencode(str_replace("/", "<<SLASH>>", base64_encode($result->proxyLink)))]);
                $result->link = $url;
                $result->proxyLink = $proxyUrl;
            }
            return $results;
        } else {
            return $results;
        }
    }

    public function authorize($key)
    {
        $postdata = http_build_query(array(
            'dummy' => rand(),
        ));
        $opts = array('http' => array(
            'method' => 'POST',
            'header' => 'Content-type: application/x-www-form-urlencoded',
            'content' => $postdata,
        ),
        );

        $context = stream_context_create($opts);

        try {
            $link = "https://key.metager3.de/" . urlencode($key) . "/request-permission/api-access";
            $result = json_decode(file_get_contents($link, false, $context));
            if ($result->{'api-access'} == true) {
                return true;
            } else {
                return false;
            }

        } catch (\ErrorException $e) {
            return false;
        }
    }

    public function createQuicktips()
    {
        # Die quicktips werden als job erstellt und zur Abarbeitung freigegeben
        $quicktips = new \App\Models\Quicktips\Quicktips($this->q, $this->lang, $this->getTime(), $this->getHashCode());
        return $quicktips;
    }

    /*
     * Die Erstellung der Suchmaschinen bis die Ergebnisse da sind mit Unterfunktionen
     */

    public function createSearchEngines(Request $request)
    {
        # Wenn es kein Suchwort gibt
        if (!$request->filled("eingabe") || $this->q === "") {
            return;
        }

        $this->enabledSearchengines = [];
        $overtureEnabled = false;

        # Check if selected focus is valid
        if (empty($this->sumaFile->foki->{$this->fokus})) {
            $this->fokus = "web";
        }

        foreach ($this->sumaFile->foki->{$this->fokus}->sumas as $suma) {
            # Check if this engine is disabled and can't be used
            $disabled = empty($this->sumaFile->sumas->{$suma}->disabled) ? false : $this->sumaFile->sumas->{$suma}->disabled;
            $autoDisabled = empty($this->sumaFile->sumas->{$suma}->{"auto-disabled"}) ? false : $this->sumaFile->sumas->{$suma}->{"auto-disabled"};
            if ($disabled || $autoDisabled) {
                continue;
            }

            # Check if this engine can use eventually defined query-filter
            $valid = true;
            foreach ($this->queryFilter as $queryFilter => $filter) {
                if (empty($this->sumaFile->filter->{"query-filter"}->$queryFilter->sumas->$suma)) {
                    $valid = false;
                    break;
                }
            }
            # Check if this engine can use eventually defined parameter-filter
            if ($valid) {
                foreach ($this->parameterFilter as $filterName => $filter) {
                    if (empty($filter->sumas->$suma)) {
                        $valid = false;
                        break;
                    }
                }
            }
            # Check if this engine should only be active when filter is used
            if ($this->sumaFile->sumas->{$suma}->{"filter-opt-in"}) {
                # This search engine should only be used when a parameter filter of it is used
                $validTmp = false;
                foreach ($this->parameterFilter as $filterName => $filter) {
                    if (!empty($filter->sumas->{$suma})) {
                        $validTmp = true;
                        break;
                    }
                }
                if (!$validTmp) {
                    $valid = false;
                }

            }
            # If it can we add it
            if ($valid) {
                $this->enabledSearchengines[$suma] = $this->sumaFile->sumas->{$suma};
            }

        }

        if (sizeof($this->enabledSearchengines) === 0) {
            $filter = "";
            foreach ($this->queryFilter as $queryFilter => $filterPhrase) {
                $filter .= trans($this->sumaFile->filter->{"query-filter"}->{$queryFilter}->name) . ",";
            }
            $filter = rtrim($filter, ",");
            $error = trans('metaGer.engines.noSpecialSearch', ['fokus' => trans($this->sumaFile->foki->{$this->fokus}->{"display-name"}),
                'filter' => $filter]);
            $this->errors[] = $error;
        }

        $engines = [];
        $typeslist = [];
        $counter = 0;

        if ($this->requestIsCached($request)) {
            $engines = $this->getCachedEngines($request);
            # We need to edit some Options of the Cached Search Engines
            foreach ($engines as $engine) {
                $engine->setResultHash($this->getHashCode());
            }
        } else {
            $engines = $this->actuallyCreateSearchEngines($this->enabledSearchengines);
        }

        # Wir starten alle Suchen
        foreach ($engines as $engine) {
            $engine->startSearch($this);
        }

        /* Wir warten auf die Antwort der Suchmaschinen
         * Die Verbindung steht zu diesem Zeitpunkt und auch unsere Requests wurden schon gesendet.
         * Wir zählen die Suchmaschinen, die durch den Cache beantwortet wurden:
         * $enginesToLoad zählt einerseits die Suchmaschinen auf die wir warten und andererseits
         * welche Suchmaschinen nicht rechtzeitig geantwortet haben.
         */

        $enginesToLoad = [];
        $canBreak = false;
        foreach ($engines as $engine) {
            if ($engine->cached) {
                if ($overtureEnabled && ($engine->name === "overture" || $engine->name === "overtureAds")) {
                    $canBreak = true;
                }
            } else {
                $enginesToLoad[$engine->name] = false;
            }
        }

        $this->waitForResults($enginesToLoad, $overtureEnabled, $canBreak);

        $this->retrieveResults($engines);
        foreach ($engines as $engine) {
            if (!empty($engine->totalResults) && $engine->totalResults > $this->totalResults) {
                $this->totalResults = $engine->totalResults;
            }
        }
    }

    # Spezielle Suchen und Sumas

    public function sumaIsSelected($suma, $request, $custom)
    {
        if ($custom) {
            if ($request->filled("engine_" . strtolower($suma["name"]))) {
                return true;
            }
        } else {
            $types = explode(",", $suma["type"]);
            if (in_array($this->fokus, $types)) {
                return true;
            }
        }
        return false;
    }

    public function actuallyCreateSearchEngines($enabledSearchengines)
    {
        $engines = [];
        foreach ($enabledSearchengines as $engineName => $engine) {

            if (!isset($engine->{"parser-class"})) {
                die(var_dump($engine));
            }
            # Setze Pfad zu Parser
            $path = "App\\Models\\parserSkripte\\" . $engine->{"parser-class"};

            # Prüfe ob Parser vorhanden
            if (!file_exists(app_path() . "/Models/parserSkripte/" . $engine->{"parser-class"} . ".php")) {
                Log::error("Konnte " . $engine->{"display-name"} . " nicht abfragen, da kein Parser existiert");
                $this->errors[] = trans('metaGer.engines.noParser', ['engine' => $engine->{"display-name"}]);
                continue;
            }

            # Es wird versucht die Suchengine zu erstellen
            $time = microtime();
            try {
                $tmp = new $path($engineName, $engine, $this);
            } catch (\ErrorException $e) {
                Log::error("Konnte " . $engine->{"display-name"} . " nicht abfragen. " . var_dump($e));
                continue;
            }

            $engines[] = $tmp;
        }
        return $engines;
    }

    public function getAvailableParameterFilter()
    {
        $parameterFilter = $this->sumaFile->filter->{"parameter-filter"};

        $availableFilter = [];

        foreach ($parameterFilter as $filterName => $filter) {
            # Check if any of the enabled search engines provide this filter
            foreach ($this->enabledSearchengines as $engineName => $engine) {
                if (!empty($filter->sumas->$engineName)) {
                    $availableFilter[$filterName] = $filter;
                }
            }
            # We will also add the filter from the opt-in search engines (the searchengines that are only used when a filter of it is too)
            foreach ($this->sumaFile->foki->{$this->fokus}->sumas as $suma) {
                if ($this->sumaFile->sumas->{$suma}->{"filter-opt-in"}) {
                    if (!empty($filter->sumas->{$suma})) {
                        # If the searchengine is disabled this filter shouldn't be available
                        if ((!empty($this->sumaFile->sumas->{$suma}->disabled) && $this->sumaFile->sumas->{$suma}->disabled === true)
                            || (!empty($this->sumaFile->sumas->{$suma}->{"auto-disabled"}) && $this->sumaFile->sumas->{$suma}->{"auto-disabled"} === true)) {
                            continue;
                        }
                        $availableFilter[$filterName] = $filter;
                    }
                }
            }
        }

        return $availableFilter;
    }

    public function isBildersuche()
    {
        return $this->fokus === "bilder";
    }

    public function sumaIsAdsuche($suma, $overtureEnabled)
    {
        $sumaName = $suma["name"]->__toString();
        return
            $sumaName === "qualigo"
            || $sumaName === "similar_product_ads"
            || (!$overtureEnabled && $sumaName === "overtureAds");
    }

    public function sumaIsDisabled($suma)
    {
        return
        isset($suma['disabled'])
        && $suma['disabled']->__toString() === "1";
    }

    public function sumaIsOverture($suma)
    {
        return
        $suma["name"]->__toString() === "overture"
        || $suma["name"]->__toString() === "overtureAds";
    }

    public function sumaIsNotAdsuche($suma)
    {
        return
        $suma["name"]->__toString() !== "qualigo"
        && $suma["name"]->__toString() !== "similar_product_ads"
        && $suma["name"]->__toString() !== "overtureAds";
    }

    public function requestIsCached($request)
    {
        return
        $request->filled('next')
        && Cache::has($request->input('next'))
        && unserialize(Cache::get($request->input('next')))['page'] > 1;
    }

    public function getCachedEngines($request)
    {
        $next = unserialize(Cache::get($request->input('next')));
        $this->page = $next['page'];
        $engines = $next['engines'];
        if (isset($next['startForwards'])) {
            $this->startForwards = $next['startForwards'];
        }
        if (isset($next['startBackwards'])) {
            $this->startBackwards = $next['startBackwards'];
        }
        return $engines;
    }

    # Passt den Suchfokus an, falls für einen Fokus genau alle vorhandenen Sumas eingeschaltet sind
    public function adjustFocus($sumas, $enabledSearchengines)
    {
        # Findet für alle Foki die enthaltenen Sumas
        $foki = []; # [fokus][suma] => [suma]
        foreach ($sumas as $suma) {
            if ((!$this->sumaIsDisabled($suma)) && (!isset($suma['userSelectable']) || $suma['userSelectable']->__toString() === "1")) {
                if (isset($suma['type'])) {
                    # Wenn foki für diese Suchmaschine angegeben sind
                    $focuses = explode(",", $suma['type']->__toString());
                    foreach ($focuses as $foc) {
                        if (isset($suma['minismCollection'])) {
                            $foki[$foc][] = "minism";
                        } else {
                            $foki[$foc][] = $suma['name']->__toString();
                        }
                    }
                } else {
                    # Wenn keine foki für diese Suchmaschine angegeben sind
                    if (isset($suma['minismCollection'])) {
                        $foki["andere"][] = "minism";
                    } else {
                        $foki["andere"][] = $suma['name']->__toString();
                    }
                }
            }
        }

        # Findet die Namen der aktuell eingeschalteten Sumas
        $realEngNames = [];
        foreach ($enabledSearchengines as $realEng) {
            $nam = $realEng["name"]->__toString();
            if ($nam !== "qualigo" && $nam !== "overtureAds") {
                $realEngNames[] = $nam;
            }
        }

        # Anschließend werden diese beiden Listen verglichen (jeweils eine der Fokuslisten für jeden Fokus), um herauszufinden ob sie vielleicht identisch sind. Ist dies der Fall, so hat der Nutzer anscheinend Suchmaschinen eines kompletten Fokus eingestellt. Der Fokus wird dementsprechend angepasst.
        foreach ($foki as $fok => $engines) {
            $isFokus = true;
            $fokiEngNames = [];
            foreach ($engines as $eng) {
                $fokiEngNames[] = $eng;
            }
            # Jede eingeschaltete Engine ist für diesen Fokus geeignet
            foreach ($fokiEngNames as $fen) {
                # Bei Bildersuchen ist uns egal, ob alle Suchmaschinen aus dem Suchfokus eingeschaltet sind, da wir sie eh als Bildersuche anzeigen müssen
                if (!in_array($fen, $realEngNames) && $fok !== "bilder") {
                    $isFokus = false;
                }
            }
            # Jede im Fokus erwartete Engine ist auch eingeschaltet
            foreach ($realEngNames as $ren) {
                if (!in_array($ren, $fokiEngNames)) {
                    $isFokus = false;
                }
            }
            # Wenn die Listen identisch sind, setze den Fokus um
            if ($isFokus) {
                $this->fokus = $fok;
            }
        }
    }

    public function waitForResults($enginesToLoad, $overtureEnabled, $canBreak)
    {

        $timeStart = microtime(true);
        $results = null;
        while (true) {
            $results = Redis::hgetall('search.' . $this->getHashCode());

            $ready = true;
            // When every
            $connected = true;
            foreach ($results as $key => $value) {
                if ($value === "waiting" || $value === "connected") {
                    $ready = false;
                }
                if ($value === "waiting") {
                    $connected = false;
                }
            }

            // If $ready is false at this point, we're waiting for more searchengines
            // But we have to check for the timeout, too
            if (!$connected) {
                $timeStart = microtime(true);
            }

            $time = (microtime(true) - $timeStart) * 1000;
            // We will apply the timeout only if it's not Yahoo we're waiting for since they are one the most
            // important search engines.
            $canTimeout = !((isset($results["overture"]) && $results["overture"] === "waiting") || (isset($results["overtureAds"]) && $results["overtureAds"] === "waiting"));
            if ($time > $this->time && $canTimeout) {
                $ready = true;
            }

            if ($ready) {
                break;
            }
            usleep(50000);
        }

        # Wir haben nun so lange wie möglich gewartet. Wir registrieren nun noch die Suchmaschinen, die geanwortet haben.
        foreach ($results as $key => $value) {
            $enginesToLoad[$key] = true;
        }
        $this->enginesToLoad = $enginesToLoad;
    }

    public function retrieveResults($engines)
    {
        # Von geladenen Engines die Ergebnisse holen
        foreach ($engines as $engine) {
            if (!$engine->loaded) {
                try {
                    $engine->retrieveResults($this);
                } catch (\ErrorException $e) {
                    Log::error($e);
                }
            }
        }

        $this->engines = $engines;