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Editing: plugin.php

<?php

/**
 * elFinder Plugin AutoResize
 * Auto resize on file upload.
 * ex. binding, configure on connector options
 *    $opts = array(
 *        'bind' => array(
 *            'upload.presave' => array(
 *                'Plugin.AutoResize.onUpLoadPreSave'
 *            )
 *        ),
 *        // global configure (optional)
 *        'plugin' => array(
 *            'AutoResize' => array(
 *                'enable'         => true,       // For control by volume driver
 *                'maxWidth'       => 1024,       // Path to Water mark image
 *                'maxHeight'      => 1024,       // Margin right pixel
 *                'quality'        => 95,         // JPEG image save quality
 *                'preserveExif'   => false,      // Preserve EXIF data (Imagick only)
 *                'forceEffect'    => false,      // For change quality or make progressive JPEG of small images
 *                'targetType'     => IMG_GIF|IMG_JPG|IMG_PNG|IMG_WBMP, // Target image formats ( bit-field )
 *                'offDropWith'    => null,       // Enabled by default. To disable it if it is dropped with pressing the meta key
 *                                                // Alt: 8, Ctrl: 4, Meta: 2, Shift: 1 - sum of each value
 *                                                // In case of using any key, specify it as an array
 *                'onDropWith'     => null        // Disabled by default. To enable it if it is dropped with pressing the meta key
 *                                                // Alt: 8, Ctrl: 4, Meta: 2, Shift: 1 - sum of each value
 *                                                // In case of using any key, specify it as an array
 *            )
 *        ),
 *        // each volume configure (optional)
 *        'roots' => array(
 *            array(
 *                'driver' => 'LocalFileSystem',
 *                'path'   => '/path/to/files/',
 *                'URL'    => 'http://localhost/to/files/'
 *                'plugin' => array(
 *                    'AutoResize' => array(
 *                        'enable'         => true,       // For control by volume driver
 *                        'maxWidth'       => 1024,       // Path to Water mark image
 *                        'maxHeight'      => 1024,       // Margin right pixel
 *                        'quality'        => 95,         // JPEG image save quality
 *                        'preserveExif'   => false,      // Preserve EXIF data (Imagick only)
 *                        'forceEffect'    => false,      // For change quality or make progressive JPEG of small images
 *                        'targetType'     => IMG_GIF|IMG_JPG|IMG_PNG|IMG_WBMP, // Target image formats ( bit-field )
 *                        'offDropWith'    => null,       // Enabled by default. To disable it if it is dropped with pressing the meta key
 *                                                        // Alt: 8, Ctrl: 4, Meta: 2, Shift: 1 - sum of each value
 *                                                        // In case of using any key, specify it as an array
 *                        'onDropWith'     => null        // Disabled by default. To enable it if it is dropped with pressing the meta key
 *                                                        // Alt: 8, Ctrl: 4, Meta: 2, Shift: 1 - sum of each value
 *                                                        // In case of using any key, specify it as an array
 *                    )
 *                )
 *            )
 *        )
 *    );
 *
 * @package elfinder
 * @author  Naoki Sawada
 * @license New BSD
 */
class elFinderPluginAutoResize extends elFinderPlugin
{

public function __construct($opts)
    {
        $defaults = array(
            'enable' => true,       // For control by volume driver
            'maxWidth' => 1024,       // Path to Water mark image
            'maxHeight' => 1024,       // Margin right pixel
            'quality' => 95,         // JPEG image save quality
            'preserveExif' => false,      // Preserve EXIF data (Imagick only)
            'forceEffect' => false,      // For change quality or make progressive JPEG of small images
            'targetType' => IMG_GIF | IMG_JPG | IMG_PNG | IMG_WBMP, // Target image formats ( bit-field )
            'offDropWith' => null,       // To disable it if it is dropped with pressing the meta key
            // Alt: 8, Ctrl: 4, Meta: 2, Shift: 1 - sum of each value
            // In case of using any key, specify it as an array
            'disableWithContentSaveId' => true // Disable on URL upload with post data "contentSaveId"
        );

$this->opts = array_merge($defaults, $opts);

}

public function onUpLoadPreSave(&$thash, &$name, $src, $elfinder, $volume)
    {
        if (!$src) {
            return false;
        }

$opts = $this->getCurrentOpts($volume);

if (!$this->iaEnabled($opts, $elfinder)) {
            return false;
        }

$imageType = null;
        $srcImgInfo = null;
        if (extension_loaded('fileinfo') && function_exists('mime_content_type')) {
            $mime = mime_content_type($src);
            if (substr($mime, 0, 5) !== 'image') {
                return false;
            }
        }
        if (extension_loaded('exif') && function_exists('exif_imagetype')) {
            $imageType = exif_imagetype($src);
            if ($imageType === false) {
                return false;
            }
        } else {
            $srcImgInfo = getimagesize($src);
            if ($srcImgInfo === false) {
                return false;
            }
            $imageType = $srcImgInfo[2];
        }

// check target image type
        $imgTypes = array(
            IMAGETYPE_GIF => IMG_GIF,
            IMAGETYPE_JPEG => IMG_JPEG,
            IMAGETYPE_PNG => IMG_PNG,
            IMAGETYPE_BMP => IMG_WBMP,
            IMAGETYPE_WBMP => IMG_WBMP
        );
        if (!isset($imgTypes[$imageType]) || !($opts['targetType'] & $imgTypes[$imageType])) {
            return false;
        }

if (!$srcImgInfo) {
            $srcImgInfo = getimagesize($src);
        }

if ($opts['forceEffect'] || $srcImgInfo[0] > $opts['maxWidth'] || $srcImgInfo[1] > $opts['maxHeight']) {
            return $this->resize($volume, $src, $srcImgInfo, $opts['maxWidth'], $opts['maxHeight'], $opts['quality'], $opts['preserveExif']);
        }

return false;
    }

private function resize($volume, $src, $srcImgInfo, $maxWidth, $maxHeight, $jpgQuality, $preserveExif)
    {
        $zoom = min(($maxWidth / $srcImgInfo[0]), ($maxHeight / $srcImgInfo[1]));
        $width = round($srcImgInfo[0] * $zoom);
        $height = round($srcImgInfo[1] * $zoom);
        $unenlarge = true;
        $checkAnimated = true;

return $volume->imageUtil('resize', $src, compact('width', 'height', 'jpgQuality', 'preserveExif', 'unenlarge', 'checkAnimated'));
    }
}

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Editing: plugin.php

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