resize-images-before-upload.php

<?php
/*
Plugin Name: Resize images before upload
Plugin URI: https://github.com/WPsites/Resize-images-before-upload
Description: Resize your images before they are uploaded to the server, no need to use image editing software. You can drag+drop images straight from your digital camera right into WordPress
Version: 1.8
Author: Simon @ WPsites
Author URI: http://www.wpsites.co.uk
License: GPL3
*/

//we use sessions to keep a session record of the flash warning as not to annoy
if ( !session_id() )
    session_start();
   
class WP_Resize_Images_Before_Upload {
        
    /**
     * The constructor 
     * @return void
     */
    function __construct() {
    
        if ( ! defined( 'RIBU_RESIZE_WIDTH' ) )
            define( 'RIBU_RESIZE_WIDTH', $this->get_resize_width() );
        if ( ! defined( 'RIBU_RESIZE_HEIGHT' ) )
            define( 'RIBU_RESIZE_HEIGHT', $this->get_resize_height()  ); 
        if ( ! defined( 'RIBU_RESIZE_QUALITY' ) )
    	    define( 'RIBU_RESIZE_QUALITY', $this->get_resize_quality() ); 
        if ( ! defined( 'RIBU_MAX_UPLOAD_SIZE' ) )
    	    define( 'RIBU_MAX_UPLOAD_SIZE', $this->get_max_upload() ); 
    	if ( ! defined( 'RIBU_FRONTEND_JS' ) )
    	    define( 'RIBU_FRONTEND_JS', false ); 
    	
        
        // store the flash warning seen variable as a session
        if ( isset($_GET['you_toldmeabout_flash']) ){
            $_SESSION['you_toldmeabout_flash'] = "donttellmeagain";
        }
    
        add_filter('plupload_init', array($this,'plupload_init'),20);
        add_filter('plupload_default_settings', array($this,'plupload_default_settings'),20);
        add_filter('plupload_default_params', array($this,'plupload_default_settings'),20); 
    
    	
    	add_action('post-upload-ui', array($this,'rbu_show_note'),10);
        add_action('admin_footer',  array($this,'rbu_print_js'),10); //javascript output is only for the old uploader, new uploader uses plupload_default_settings/plupload_init
        if ( RIBU_FRONTEND_JS == true ) {
    	    add_action('wp_footer',  array($this,'rbu_print_js'),10); // it's possible to have the media manager on the front end too, but you should ask for it :)
        }
    	add_action('admin_init', array($this,'admin_init_settings'),20);
    
     

    }

    function get_max_upload() {
 
    	if ( function_exists('wp_max_upload_size') ){
    	    return wp_max_upload_size();
    	} else{
    	    return ini_get('upload_max_filesize') . 'b';
    	}
 
    }
    
    function rbu_show_note(){
    	echo "<p> " . __('Images will be resized to the large image dimensions, as specified in your media settings') . "</p>";
    }
    
    
    function rbu_print_js(){
        $quality =  $this->get_resize_quality() ;
	?>
	<script type="text/javascript"> 
        
        jQuery(window).load(function($){
        
                try{ 
                	if (uploader =='undefined' );
                    
                		    uploader.settings.max_file_size = '200097152b';
                            uploader.settings['resize'] = { width: <?php echo RIBU_RESIZE_WIDTH; ?>, height: <?php echo RIBU_RESIZE_HEIGHT; ?>, quality: <?php echo RIBU_RESIZE_QUALITY; ?>  };
            		
            	}catch(err){ }
                    
                    
        	    
        });

	</script>
	<?php 
	    
	if ( $this->incompatible_browser() && !isset($_SESSION['you_toldmeabout_flash']) ){
	
	    ?>
			<script type="text/javascript">
			    
			    var hasFlash = false;
			    try {
			      var fo = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
			      if(fo) hasFlash = true;
			    }catch(e){
			      if(navigator.mimeTypes ["application/x-shockwave-flash"] != undefined) hasFlash = true;
			    }

			    if(!hasFlash){
				
				alert('<?php echo __('Automatic resizing of images is not possible with your web browser (the Adobe Flash plug-in is required for otherwise incompatible browsers). \n\nEither install Flash or use a more suitable web browser (Firefox 3.5+, Chrome) '); ?>');
				location.href = "<?php echo add_query_arg('you_toldmeabout_flash','donttellmeagain');?>";
	    
			    }
		
			</script>
	    <?php
	
	}
	    
	    
    }

    function plupload_init($plupload_init_array){
        
        //remove max file size
        unset($plupload_init_array['max_file_size']);
        
        
         //change runtime to flash for non firefox/chrome browsers, unless this action is cancelled by the rbu_cancel_force_flash setting
	     if (!get_option('rbu_cancel_force_flash')){
		
    		// if incompatible and we havent told them about flash being missing then lets use flash runtime -
    		// we can't be sure if they have flash though - and if they don't we'll load this again after telling them about no resize/flash, once told we will just roll without flash, no resize possible
    		if ( $this->incompatible_browser() ){
    			$plupload_init_array['runtimes'] = "flash"; // 'runtimes' => 'html5,silverlight,flash,html4',
    		}
		
	     }

            return $plupload_init_array;
    }
    
    function plupload_default_settings($plupload_setting_array){
        
        //remove max file size by makinb it huge
        $plupload_setting_array['max_file_size'] = "200097152b";
        
        $plupload_setting_array['resize'] = array("width" => RIBU_RESIZE_WIDTH, "height" => RIBU_RESIZE_HEIGHT, "quality" => RIBU_RESIZE_QUALITY);
        
        
         //change runtime to flash for non firefox/chrome browsers, unless this action is cancelled by the rbu_cancel_force_flash setting
         if (!get_option('rbu_cancel_force_flash')){
		
    		// if incompatible and we havent told them about flash being missing then lets use flash runtime -
    		// we can't be sure if they have flash though - and if they don't we'll load this again after telling them about no resize/flash, once told we will just roll without flash, no resize possible
    		if ( $this->incompatible_browser() ){
    			$plupload_setting_array['runtimes'] = "flash"; // 'runtimes' => 'html5,silverlight,flash,html4',
    		}
		
	     }

            return $plupload_setting_array;
    }
	
	// Register and define the settings
	function admin_init_settings(){
        
		// create settings section
		add_settings_section('rbu_media_settings_section',
				'Resize before upload',
				array($this,'media_settings_section_callback_function'),
				'media');
		
		// settings, put it in our new section
		add_settings_field('rbu_resize_quality',
			'Resize quality',
			array($this,'resize_quality_callback_function'),
			'media',
			'rbu_media_settings_section');
            
        // settings, put it in our new section
		add_settings_field('rbu_resize_height',
			'Resize height',
			array($this,'resize_height_callback_function'),
			'media',
			'rbu_media_settings_section');
        // settings, put it in our new section
    	add_settings_field('rbu_resize_width',
			'Resize width',
			array($this,'resize_width_callback_function'),
			'media',
			'rbu_media_settings_section');
         
		
		add_settings_field('rbu_cancel_force_flash',
			'Disable force flash',
			array($this,'cancel_force_flash_callback_function'),
			'media',
			'rbu_media_settings_section');
		
		// Register our setting so that $_POST handling is done for us and
		register_setting('media',
				 'rbu_resize_quality',
				 array($this,'resize_quality_validate_input') );
        register_setting('media',
				 'rbu_resize_height' );
        register_setting('media',
				 'rbu_resize_width' );
		register_setting('media',
				 'rbu_cancel_force_flash');
	}
	
	function media_settings_section_callback_function(){
		//output nothing at this stage.
	}
	
	function resize_quality_callback_function(){
		echo '<input name="rbu_resize_quality" id="rbu_resize_quality" type="text" value="'. $this->get_resize_quality() .'" class="small-text" /> <em class="description">1 - 100   (a low quality value will result in a considerably smaller file size and lower quality images - 80 is optimum)</em>';
	}
    
    function resize_width_callback_function(){
		echo '<input name="rbu_resize_width" id="rbu_resize_width" type="text" value="'. $this->get_resize_width() .'" class="small-text" /> <em class="description">you can override this by setting RIBU_RESIZE_WIDTH in your wp-config file</em>';
	}
    
    function resize_height_callback_function(){
		echo '<input name="rbu_resize_height" id="rbu_resize_height" type="text" value="'. $this->get_resize_height() .'" class="small-text" /> <em class="description">you can override this by setting RIBU_RESIZE_HEIGHT in your wp-config file</em>';
	}
	
	function cancel_force_flash_callback_function(){
		echo '<input name="rbu_cancel_force_flash" id="rbu_cancel_force_flash" type="checkbox" value="1" ' . checked( 1, get_option('rbu_cancel_force_flash'), false ) . ' class="small-text" /> <em class="description">Do not force the Flash uploader for non Chrome/Firefox browsers.</em>';
	}
	
	function incompatible_browser(){
	    
		if (! preg_match("#Firefox|Chrome|iPad|iPhone|Opera#", $_SERVER['HTTP_USER_AGENT']) ){
			return true;
		}
		
		return false;
	}
	
	function resize_quality_validate_input($quality){
		
		$quality = absint( $quality ); //validate
		
		if ($quality > 0 && $quality < 101){
			return $quality;
		}else{
			add_settings_error(
				'rbu_resize_quality',           // setting title
				'rbu_resize_quality_error',            // error ID
				'Invalid resize quality, a value between 1-100 is required -  so a default value of 80 has been set.',   // error message
				'error'                        // type of message
			);
			return 80;
		}
		
	}
	
	function get_resize_quality(){
		
		//get quality out of settings
		$quality = get_option('rbu_resize_quality');
		
		//return quality or default setting 
		if ($quality > 0 && $quality < 101){
			return $quality;
		}else{
			return 80;
		}
	}
    
    function get_resize_width(){
		
		//get quality out of settings
		$width = get_option('rbu_resize_width');

		//return width or false 
		if ($width){
			return $width;
		}else{
			return get_option('large_size_w');
		}
	}
    
    function get_resize_height(){
    	
		//get quality out of settings
		$height = get_option('rbu_resize_height');
		
		//return width or false 
		if ($height){
			return $height;
		}else{
			return get_option('large_size_h');
		}
	}

}

/**
 * Register the plugin - unless we have told them about a flash problem in which case this plugin is useless
 */
if ( !isset($_SESSION['you_toldmeabout_flash']) ){
    add_action("init", function(){return new WP_Resize_Images_Before_Upload;});
}

// Ending PHP tag is not needed, it will only increase the risk of white space 
// being sent to the browser before any HTTP headers.