Delivery.php

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<?php

declare(strict_types=1);

namespace ILIAS\FileDelivery;

use ILIAS\Filesystem\Stream\FileStream;
use ILIAS\HTTP\Services;
use ILIAS\FileDelivery\FileDeliveryTypes\DeliveryMethod;
use ILIAS\FileDelivery\FileDeliveryTypes\FileDeliveryTypeFactory;
use ILIAS\HTTP\Response\ResponseHeader;

final class Delivery
{
    public const DIRECT_PHP_OUTPUT = 'php://output';
    public const DISP_ATTACHMENT = 'attachment';
    public const DISP_INLINE = 'inline';
    public const EXPIRES_IN = '+5 days';
    private static ?string $delivery_type_static = null;
    private string $delivery_type = DeliveryMethod::PHP;
    private string $mime_type = '';
    private string $path_to_file = '';
    private string $download_file_name = '';
    private string $disposition = self::DISP_ATTACHMENT;
    private bool $send_mime_type = true;
    private bool $exit_after = true;
    private bool $convert_file_name_to_asci = true;
    private string $etag = '';
    private bool $show_last_modified = true;
    private bool $has_context = true;
    private bool $cache = false;
    private bool $hash_filename = false;
    private bool $delete_file = false;
    private static bool $DEBUG = false;
    private Services $http;
    private FileDeliveryTypeFactory $factory;
    private ?FileStream $resource = null;


    public function __construct($input, Services $http)
    {
        $this->http = $http;
        if ($input instanceof FileStream) {
            $this->resource = $input;
            $this->path_to_file = $input->getMetadata('uri');
        } elseif ($input === self::DIRECT_PHP_OUTPUT) {
            $this->setPathToFile(self::DIRECT_PHP_OUTPUT);
        } else {
            $this->setPathToFile($input);
        }

        $this->detemineDeliveryType();
        $this->determineMimeType();
        $this->determineDownloadFileName();

        $this->setHasContext(\ilContext::getType() !== null);
        $this->factory = new FileDeliveryTypeFactory($http);
    }


    public function stream(): void
    {
        if (!$this->delivery()->supportsStreaming()) {
            $this->setDeliveryType(DeliveryMethod::PHP_CHUNKED);
        }
        $this->deliver();
    }

    private function delivery(): ilFileDeliveryType
    {
        if ($this->isDeleteFile()) {
            return $this->factory->getInstance(DeliveryMethod::PHP);
        }

        return $this->factory->getInstance($this->getDeliveryType());
    }


    public function deliver(): void
    {
        $response = $this->http->response()->withHeader('X-ILIAS-FileDelivery-Method', $this->getDeliveryType());
        if (
            !$this->delivery()->doesFileExists($this->path_to_file)
            && $this->path_to_file !== self::DIRECT_PHP_OUTPUT
        ) {
            $response = $this->http->response()->withStatus(404);
            $this->http->saveResponse($response);
            $this->http->sendResponse();
            $this->close();
        }
        $this->http->saveResponse($response);

        $this->clearBuffer();
        $this->checkCache();
        $this->setGeneralHeaders();
        $this->delivery()->prepare($this->getPathToFile(), $this->resource);
        $this->delivery()->deliver($this->getPathToFile(), $this->isDeleteFile());
        if ($this->isDeleteFile()) {
            $this->delivery()->handleFileDeletion($this->getPathToFile());
        }
        if ($this->isExitAfter()) {
            $this->close();
        }
    }


    public function setGeneralHeaders(): void
    {
        $this->checkExisting();
        if ($this->isSendMimeType()) {
            $response = $this->http->response()->withHeader(ResponseHeader::CONTENT_TYPE, $this->getMimeType());
            $this->http->saveResponse($response);
        }
        if ($this->isConvertFileNameToAsci()) {
            $this->cleanDownloadFileName();
        }
        if ($this->hasHashFilename()) {
            $this->setDownloadFileName(md5($this->getDownloadFileName()));
        }
        $this->setDispositionHeaders();
        $response = $this->http->response()->withHeader(ResponseHeader::ACCEPT_RANGES, 'bytes');
        $this->http->saveResponse($response);
        if ($this->getDeliveryType() === DeliveryMethod::PHP
            && $this->getPathToFile() !== self::DIRECT_PHP_OUTPUT
        ) {
            $response = $this->http->response()->withHeader(ResponseHeader::CONTENT_LENGTH, (string) filesize($this->getPathToFile()));
            $this->http->saveResponse($response);
        }
        $response = $this->http->response()->withHeader(ResponseHeader::CONNECTION, "close");
        $this->http->saveResponse($response);
    }


    public function setCachingHeaders(): void
    {
        $response = $this->http->response()->withHeader(ResponseHeader::CACHE_CONTROL, 'must-revalidate, post-check=0, pre-check=0')->withHeader(ResponseHeader::PRAGMA, 'public');

        $this->http->saveResponse($response->withHeader(ResponseHeader::EXPIRES, date("D, j M Y H:i:s", strtotime(self::EXPIRES_IN)) . " GMT"));
        $this->sendEtagHeader();
        $this->sendLastModified();
    }


    public function generateEtag(): void
    {
        $this->setEtag(md5(filemtime($this->getPathToFile()) . filesize($this->getPathToFile())));
    }


    public function close(): void
    {
        $this->http->close();
    }


    private function determineMimeType(): void
    {
        $info = \ILIAS\FileUpload\MimeType::lookupMimeType($this->getPathToFile(), \ILIAS\FileUpload\MimeType::APPLICATION__OCTET_STREAM);
        if ($info) {
            $this->setMimeType($info);

            return;
        }
        $finfo = finfo_open(FILEINFO_MIME_TYPE);
        $info = finfo_file($finfo, $this->getPathToFile());
        finfo_close($finfo);
        if ($info) {
            $this->setMimeType($info);

            return;
        }
    }


    private function determineDownloadFileName(): void
    {
        if (!$this->getDownloadFileName()) {
            $download_file_name = basename($this->getPathToFile());
            $this->setDownloadFileName($download_file_name);
        }
    }


    private function detemineDeliveryType(): void
    {
        if (self::$delivery_type_static) {
            $this->setDeliveryType(self::$delivery_type_static);

            return;
        }

        if (function_exists('apache_get_modules')
            && in_array('mod_xsendfile', apache_get_modules(), true)
        ) {
            $this->setDeliveryType(DeliveryMethod::XSENDFILE);
        }

        if (is_file('./Services/FileDelivery/classes/override.php')) {
            $override_delivery_type = false;
            require_once('./Services/FileDelivery/classes/override.php');
            if ($override_delivery_type) {
                $this->setDeliveryType($override_delivery_type);
            }
        }
        $ilRuntime = \ilRuntime::getInstance();
        if ((!$ilRuntime->isFPM() && !$ilRuntime->isHHVM())
            && $this->getDeliveryType() === DeliveryMethod::XACCEL
        ) {
            $this->setDeliveryType(DeliveryMethod::PHP);
        }

        if ($this->getDeliveryType() === DeliveryMethod::XACCEL
            && strpos($this->getPathToFile(), './data') !== 0
        ) {
            $this->setDeliveryType(DeliveryMethod::PHP);
        }

        self::$delivery_type_static = $this->getDeliveryType();
    }


    public function getDeliveryType(): string
    {
        return $this->delivery_type;
    }


    public function setDeliveryType(string $delivery_type): void
    {
        $this->delivery_type = $delivery_type;
    }


    public function getMimeType(): string
    {
        return $this->mime_type;
    }


    public function setMimeType(string $mime_type): void
    {
        $this->mime_type = $mime_type;
    }


    public function getPathToFile(): string
    {
        return $this->path_to_file;
    }


    public function setPathToFile(string $path_to_file): void
    {
        $this->path_to_file = $path_to_file;
    }


    public function getDownloadFileName(): string
    {
        return $this->download_file_name;
    }


    public function setDownloadFileName(string $download_file_name): void
    {
        $this->download_file_name = $download_file_name;
    }


    public function getDisposition(): string
    {
        return $this->disposition;
    }


    public function setDisposition(string $disposition): void
    {
        $this->disposition = $disposition;
    }


    public function isSendMimeType(): bool
    {
        return $this->send_mime_type;
    }


    public function setSendMimeType(bool $send_mime_type): void
    {
        $this->send_mime_type = $send_mime_type;
    }


    public function isExitAfter(): bool
    {
        return $this->exit_after;
    }


    public function setExitAfter(bool $exit_after): void
    {
        $this->exit_after = $exit_after;
    }


    public function isConvertFileNameToAsci(): bool
    {
        return $this->convert_file_name_to_asci;
    }


    public function setConvertFileNameToAsci(bool $convert_file_name_to_asci): void
    {
        $this->convert_file_name_to_asci = $convert_file_name_to_asci;
    }


    public function getEtag(): string
    {
        return $this->etag;
    }


    public function setEtag(string $etag): void
    {
        $this->etag = $etag;
    }


    public function getShowLastModified(): bool
    {
        return $this->show_last_modified;
    }


    public function setShowLastModified(bool $show_last_modified): void
    {
        $this->show_last_modified = $show_last_modified;
    }


    public function isHasContext(): bool
    {
        return $this->has_context;
    }


    public function setHasContext(bool $has_context): void
    {
        $this->has_context = $has_context;
    }


    public function hasCache(): bool
    {
        return $this->cache;
    }


    public function setCache(bool $cache): void
    {
        $this->cache = $cache;
    }


    public function hasHashFilename(): bool
    {
        return $this->hash_filename;
    }


    public function setHashFilename(bool $hash_filename): void
    {
        $this->hash_filename = $hash_filename;
    }


    private function sendEtagHeader(): void
    {
        if ($this->getEtag()) {
            $response = $this->http->response()->withHeader('ETag', $this->getEtag());
            $this->http->saveResponse($response);
        }
    }


    private function sendLastModified(): void
    {
        if ($this->getShowLastModified()) {
            $response = $this->http->response()->withHeader(
                'Last-Modified',
                date("D, j M Y H:i:s", filemtime($this->getPathToFile()))
                               . " GMT"
            );
            $this->http->saveResponse($response);
        }
    }

    public static function isDEBUG(): bool
    {
        return self::$DEBUG;
    }


    public static function setDEBUG(bool $DEBUG): void
    {
        self::$DEBUG = $DEBUG;
    }


    public function checkCache(): void
    {
        if ($this->hasCache()) {
            $this->generateEtag();
            $this->sendEtagHeader();
            $this->setShowLastModified(true);
            $this->setCachingHeaders();
        }
    }


    public function clearBuffer(): bool
    {
        try {
            $ob_get_contents = ob_get_contents();
            if ($ob_get_contents) {
                //                      \ilWACLog::getInstance()->write(__CLASS__ . ' had output before file delivery: '
                //                                                      . $ob_get_contents);
            }
            ob_end_clean(); // fixed 0016469, 0016467, 0016468
            return true;
        } catch (\Throwable $t) {
            return false;
        }
    }


    private function checkExisting(): void
    {
        if ($this->getPathToFile() !== self::DIRECT_PHP_OUTPUT
            && !file_exists($this->getPathToFile())
        ) {
            $this->close();
        }
    }


    private function cleanDownloadFileName(): void
    {
        $download_file_name = self::returnASCIIFileName($this->getDownloadFileName());
        $this->setDownloadFileName($download_file_name);
    }


    public static function returnASCIIFileName(string $original_filename): string
    {
        $umlaut_mapping = [
            "Ä" => "Ae",
            "Ö" => "Oe",
            "Ü" => "Ue",
            "ä" => "ae",
            "ö" => "oe",
            "ü" => "ue",
            "ß" => "ss"
        ];
        foreach ($umlaut_mapping as $src => $tgt) {
            $original_filename = str_replace($src, $tgt, $original_filename);
        }

        $ascii_filename = htmlentities($original_filename, ENT_NOQUOTES, 'UTF-8');
        $ascii_filename = preg_replace('/\&(.)[^;]*;/', '\\1', $ascii_filename);
        $ascii_filename = preg_replace('/[\x7f-\xff]/', '_', $ascii_filename);

        // OS do not allow the following characters in filenames: \/:*?"<>|
        $ascii_filename = preg_replace(
            '/[:\x5c\/\*\?\"<>\|]/',
            '_',
            $ascii_filename
        );
        return $ascii_filename;
    }


    public function isDeleteFile(): bool
    {
        return $this->delete_file;
    }


    public function setDeleteFile(bool $delete_file): void
    {
        $this->delete_file = $delete_file;
    }


    private function setDispositionHeaders(): void
    {
        $response = $this->http->response();
        $response = $response->withHeader(
            ResponseHeader::CONTENT_DISPOSITION,
            $this->getDisposition()
                                               . '; filename="'
                                               . $this->getDownloadFileName()
                                               . '"'
        );
        $response = $response->withHeader('Content-Description', $this->getDownloadFileName());
        $this->http->saveResponse($response);
    }
}