pronto/plugins/page/file.php

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<?php
class ppFile extends Plugin
{
        var $mimetypes    = array('image/png', 'image/pjpeg', 'image/jpeg', 'image/jpg', 'image/gif');
        var $jpeg_quality = 100;

        function ppFile() {
                $this->Plugin();

                if(!defined('JPEG_QUALITY')) {
                        define('JPEG_QUALITY', $this->jpeg_quality);
                }
        }

        function is_uploaded($key)
        {
                return !empty($_FILES[$key]['name']);
        }

        function move($key, $destpath)
        {
                return move_uploaded_file($_FILES[$key]['tmp_name'], $destpath);
        }

        function process_image($key, $destpath, $max_width=false, $max_height=false)
        {
                $this->depend('image');

                if(empty($_FILES[$key]['name'])) return true;
                if($_FILES[$key]['error'] > 0) {
                        return __('An error occurred during file upload.  Please try again.');
                }

                // verify mime type
                $found = false;
                foreach($this->mimetypes as $mime) {
                        if($_FILES[$key]['type'] == $mime) $found = true;
                }
                if(!$found) {
                        return __('This file does not look like a valid image.  Please upload a GIF, PNG, or JPEG.');
                }

                return $this->depends->image->resize($_FILES[$key]['type'], $_FILES[$key]['tmp_name'], $destpath, $max_width, $max_height);
        }
}

?>

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