FileHandler.class.php

<?php

// Copyright (C) 2014 Universitätsbibliothek Mannheim
// See file LICENSE for license details.

// Authors: Alexander Wagner, Stefan Weil

// Test whether the script was called directly (used for unit test).
if (!isset($unittest)) {
    $unittest = array();
}
$unittest[__FILE__] = (sizeof(get_included_files()) == 1);



class EogHandler extends FileHandler {
    function getControls() {
        return FileHandler::CURSOR | FileHandler::ZOOM;
    }
    function show($path) {
    }
}

class LibreOfficeHandler extends FileHandler {
    function getControls() {
        return FileHandler::CURSOR | FileHandler::ZOOM;
    }
    function show($path) {
    }
}

class NetsurfHandler extends FileHandler {
    function getControls() {
        return FileHandler::CURSOR | FileHandler::ZOOM;
    }
    function show($path) {
    }
}

class VlcHandler extends FileHandler {
    function getControls() {
        return FileHandler::CURSOR | FileHandler::ZOOM;
    }
    function show($path) {
    }
}

class ZathuraHandler extends FileHandler {
    function getControls() {
        return FileHandler::CURSOR | FileHandler::ZOOM |
               FileHandler::HOME | FileHandler::END |
               FileHandler::PRIOR | FileHandler::NEXT |
               FileHandler::DOWNLOAD;
    }
    function show($path) {
    }
}

abstract class FileHandler {

    // Constants for allowed controls.
    const UP = 1;
    const DOWN = 2;
    const LEFT = 4;
    const RIGHT = 8;
    const ZOOMIN = 16;
    const ZOOMOUT = 32;
    const HOME = 64;
    const END = 128;
    const PRIOR = 256;
    const NEXT = 512;
    const DOWNLOAD = 1024;

    // Shortcuts for combinations of controls.
    const CURSOR = 15; // UP | DOWN | LEFT | RIGHT
    const ZOOM = 48;   // ZOOMIN | ZOOMOUT
    const ALL = 2047;

    // up down left right zoomin zoomout home end prior next download

    // protected $FILES = array();
    // protected $UPLOAD_PATH;

    abstract protected function getControls();
    abstract protected function show($path);

    public static function getFileHandler($file) {

        $ftype = pathinfo($file, PATHINFO_EXTENSION);
        $fhandler = "";
        // $params;
        // echo $ftype;
        if($ftype==='pdf') {
            $fhandler='/usr/bin/zathura';

        } else if ($ftype==='gif' || $ftype==='jpg' || $ftype==='png') {
            $fhandler='/usr/bin/eog';

        } else if ($ftype==='doc' || $ftype==='docx' || $ftype==='odt' || $ftype==='txt') {
            $fhandler='/usr/bin/libreoffice --writer -o -n --nologo --norestore --view';

        } else if ($ftype==='ppt' || $ftype==='pptx' || $ftype==='pps' || $ftype==='ppsx' || $ftype==='odp') {
            // optional --show (presentation mode)
            $fhandler='/usr/bin/libreoffice --impress -o -n --nologo --norestore --view';

        } else if ($ftype==='xls' || $ftype==='xlsx' || $ftype==='ods') {
            $fhandler='/usr/bin/libreoffice --calc -o -n --nologo --norestore --view';

        } else if ($ftype==='html' || $ftype==='url') {
            $fhandler='/usr/bin/netsurf';

        } else if ($ftype==='mpg' || $ftype==='mpeg' || $ftype==='avi' ||
                   $ftype==='mp3' || $ftype=="mp4") {
            $fhandler='/usr/bin/vlc --no-audio';

        }

        /*
        alternatively with mime-types

            // $ftype = mime_content_type($this->UPLOAD_PATH.$file);
            // if($ftype=='application/pdf')
            // if($ftype=='image/gif' || $ftype=='image/jpg' || $ftype=='image/png' )
            // if($ftype=='html' || $ftype=='url' || $ftype="text/plain")
            // (...)

        */

        return $fhandler;
    }
}

if ($unittest[__FILE__]) {
    // Run unit test.
    $netsurfHandler = new NetsurfHandler;
    $zathuraHandler = new ZathuraHandler;
    echo("DOWNLOAD   =" . FileHandler::DOWNLOAD . "\n");
    echo("filehandler=" . FileHandler::getFileHandler("test.txt") . "\n");
    $handler = ${'netsurf' . 'Handler'};
    echo("controls   =" . $handler->getControls() . "\n");
}

?>