<?php
/*
Plugin Name: Remove EXIF
Plugin URI: http://blog.wolfs.jp/20160707-3638/
Description: アップロードした画像とサムネイル画像のexif情報を削除します。
Version: 1.0.0
Author: Kerberos
Author URI: http://blog.wolfs.jp/
*/
 
class removeExif {
    private $imagemagick_cli = true;
    private $imagemagick_path = '/usr/imagemagick/convert';
 
    public function __construct() {
        add_filter('wp_handle_upload', array($this, 'wp_handle_upload'));
        add_filter('wp_generate_attachment_metadata', array($this, 'wp_generate_attachment_metadata'), 10, 2);
    }
 
    public function wp_handle_upload($arg) {
        if ($this->check_mime($arg['type']) === true) {
            $this->remove_exif($arg['file']);
        }
 
        return $arg;
    }
 
    public function wp_generate_attachment_metadata($metadata, $attachment_id) {
        $dirArr = explode('/', $metadata['file']);
        $baseDir = wp_upload_dir(null, false);
        $uploadDir = $baseDir['basedir'].'/'.$dirArr[0].'/'.$dirArr[1].'/';
 
        foreach ($metadata['sizes'] as $entry) {
            if ($this->check_mime($entry['mime-type']) === true) {
                $this->remove_exif($uploadDir.$entry['file']);
            }
        }
 
        return $metadata;
    }
 
    private function check_mime($mime = null) {
        return ($mime === 'image/jpeg' || $mime === 'image/jpg');
    }
 
    private function remove_exif($filePath) {
        $filePath = addslashes($filePath);
 
        if (file_exists($filePath) === true) {
            if ($this->imagemagick_cli === true) {
                if (is_executable($this->imagemagick_path) === true) {
                    try {
                        exec('"'.$this->imagemagick_path.'" "'.$filePath.'" -strip "'.$filePath.'"');
                    } catch (Exception $e) {}
                }
            } else {
                if (class_exists('Imagick') === true) {
                    $im = new Imagick($filePath);
 
                    try {
                        $im->stripImage();
                        $im->writeImage($filePath);
                        $im->clear();
                        $im->destroy();
                    } catch (Exception $e) {}
                }
            }
        }
    }
}
 
new removeExif();
?>