shimmie2/ext/rotate/main.php

<?php
/*
 * Name: Rotate Image
 * Author: jgen <jgen.tech@gmail.com> / Agasa <hiroshiagasa@gmail.com>
 * Description: Allows admins to rotate images.
 * License: GPLv2
 * Version: 0.1
 * Notice:
 *  The image resize and resample code is based off of the "smart_resize_image"
 *  function copyright 2008 Maxim Chernyak, released under a MIT-style license.
 * Documentation:
 *  This extension allows admins to rotate images.
 */

/**
 * This class is just a wrapper around SCoreException.
 */
class ImageRotateException extends SCoreException
{
    /** @var string */
    public $error;

    public function __construct(string $error)
    {
        $this->error = $error;
    }
}

/**
 *	This class handles image rotate requests.
 */
class RotateImage extends Extension
{
    public function onInitExt(InitExtEvent $event)
    {
        global $config;
        $config->set_default_bool('rotate_enabled', true);
        $config->set_default_int('rotate_default_deg', 180);
    }

    public function onImageAdminBlockBuilding(ImageAdminBlockBuildingEvent $event)
    {
        global $user, $config;
        if ($user->is_admin() && $config->get_bool("rotate_enabled")) {
            /* Add a link to rotate the image */
            $event->add_part($this->theme->get_rotate_html($event->image->id));
        }
    }
    
    public function onSetupBuilding(SetupBuildingEvent $event)
    {
        $sb = new SetupBlock("Image Rotate");
        $sb->add_bool_option("rotate_enabled", "Allow rotating images: ");
        $sb->add_label("<br>Default Orientation: ");
        $sb->add_int_option("rotate_default_deg");
        $sb->add_label(" deg");
        $event->panel->add_block($sb);
    }
    
    public function onPageRequest(PageRequestEvent $event)
    {
        global $page, $user;

        if ($event->page_matches("rotate") && $user->is_admin()) {
            // Try to get the image ID
            $image_id = int_escape($event->get_arg(0));
            if (empty($image_id)) {
                $image_id = isset($_POST['image_id']) ? $_POST['image_id'] : null;
            }
            if (empty($image_id)) {
                throw new ImageRotateException("Can not rotate Image: No valid Image ID given.");
            }
            
            $image = Image::by_id($image_id);
            if (is_null($image)) {
                $this->theme->display_error(404, "Image not found", "No image in the database has the ID #$image_id");
            } else {
            
                /* Check if options were given to rotate an image. */
                if (isset($_POST['rotate_deg'])) {
                    
                    /* get options */
                    
                    $deg = 0;
                    
                    if (isset($_POST['rotate_deg'])) {
                        $deg = int_escape($_POST['rotate_deg']);
                    }
                    
                    /* Attempt to rotate the image */
                    try {
                        $this->rotate_image($image_id, $deg);
                        
                        //$this->theme->display_rotate_page($page, $image_id);
                        
                        $page->set_mode("redirect");
                        $page->set_redirect(make_link("post/view/".$image_id));
                    } catch (ImageRotateException $e) {
                        $this->theme->display_rotate_error($page, "Error Rotating", $e->error);
                    }
                }
            }
        }
    }
    
    
    // Private functions
    /* ----------------------------- */
    private function rotate_image(int $image_id, int $deg)
    {
        global $database;
        
        if (($deg <= -360) || ($deg >= 360)) {
            throw new ImageRotateException("Invalid options for rotation angle. ($deg)");
        }
        
        $image_obj = Image::by_id($image_id);
        $hash = $image_obj->hash;
        if (is_null($hash)) {
            throw new ImageRotateException("Image does not have a hash associated with it.");
        }
        
        $image_filename  = warehouse_path("images", $hash);
        if (file_exists($image_filename)==false) {
            throw new ImageRotateException("$image_filename does not exist.");
        }

        $info = getimagesize($image_filename);
        
        $memory_use =calc_memory_use ($info);
        $memory_limit = get_memory_limit();
        
        if ($memory_use > $memory_limit) {
            throw new ImageRotateException("The image is too large to rotate given the memory limits. ($memory_use > $memory_limit)");
        }
        
        
        /* Attempt to load the image */
        $image = imagecreatefromstring(file_get_contents($image_filename));

        if($image==false) {
            throw new ImageRotateException("Could not load image: ".$image_filename);
        }
        
        /* Rotate and resample the image */
        /*
        $image_rotated = imagecreatetruecolor( $new_width, $new_height );

        if ( ($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG) ) {
          $transparency = imagecolortransparent($image);

          if ($transparency >= 0) {
            $transparent_color  = imagecolorsforindex($image, $trnprt_indx);
            $transparency       = imagecolorallocate($image_rotated, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);
            imagefill($image_rotated, 0, 0, $transparency);
            imagecolortransparent($image_rotated, $transparency);
          }
          elseif ($info[2] == IMAGETYPE_PNG) {
            imagealphablending($image_rotated, false);
            $color = imagecolorallocatealpha($image_rotated, 0, 0, 0, 127);
            imagefill($image_rotated, 0, 0, $color);
            imagesavealpha($image_rotated, true);
          }
        }
        */

        $background_color = 0;
        switch($info[2]){
            case IMAGETYPE_PNG:
            case IMAGETYPE_WEBP:
                $background_color = imagecolorallocatealpha($image, 0, 0, 0, 127);
                break;
        }
        
        $image_rotated = imagerotate($image, $deg, $background_color);

        /* Temp storage while we rotate */
        $tmp_filename = tempnam(ini_get('upload_tmp_dir'), 'shimmie_rotate');
        if (empty($tmp_filename)) {
            throw new ImageRotateException("Unable to save temporary image file.");
        }
        
        /* Output to the same format as the original image */
        switch ($info[2]) {
          case IMAGETYPE_GIF:   $result = imagegif($image_rotated, $tmp_filename);      break;
          case IMAGETYPE_JPEG:  $result = imagejpeg($image_rotated, $tmp_filename);     break;
          case IMAGETYPE_PNG:   $result = imagepng($image_rotated, $tmp_filename,9);    break;
          case IMAGETYPE_WEBP:  $result = imagewebp($image_rotated, $tmp_filename);     break;
          case IMAGETYPE_BMP:   $result = imagebmp($image_rotated, $tmp_filename,true); break;
          default:
            throw new ImageRotateException("Unsupported image type.");
        }

        if($result==false) {
            throw new ImageRotateException("Could not save image: ".$tmp_filename);
        }

        list($new_width, $new_height) = getimagesize($tmp_filename);

        $new_image = new Image();
        $new_image->hash = md5_file($tmp_filename);
        $new_image->filesize = filesize($tmp_filename);
        $new_image->filename = 'rotated-'.$image_obj->filename;
        $new_image->width = $new_width;
        $new_image->height = $new_height;
        $new_image->ext = $image_obj->ext;

        /* Move the new image into the main storage location */
        $target = warehouse_path("images", $new_image->hash);
        if (!@copy($tmp_filename, $target)) {
            throw new ImageRotateException("Failed to copy new image file from temporary location ({$tmp_filename}) to archive ($target)");
        }

        /* Remove temporary file */
        @unlink($tmp_filename);

        send_event(new ImageReplaceEvent($image_id, $new_image));

        log_info("rotate", "Rotated Image #{$image_id} - New hash: {$new_image->hash}");
    }
}