Cacher is the code snippet organizer for pro developers

<?php

class ExportFieldImages extends WireData implements Module, ConfigurableModule {
    
    static public function getDefaultConfig() {
        return array(
            "includeFields" => ''
        );
    }

    public static function install(){
        $session = wire("session");
        if(!class_exists('\ZipArchive')){
            throw new WireException("ZipArchive is required to to create the zip file");
        }
    }
    
    public static function getModuleInfo() {
        return array(
            'title' => 'ExportFieldImages',
            'version' => 0.1, 
            'summary' => "Adds a button bellow images field to download a zip containing files.",
            'author' => 'Eduardo San Miguel Garcia',
            'singular' => true,
            'href' => '',
            'autoload' => true
        );
    }

    public function init() {
        $this->addHookAfter('InputfieldImage::render', $this, 'afterInputfieldImageRender');
        $this->addHookAfter("ProcessPageEdit::execute", $this, "pageEditExecuteBefore");
    }

    public function pageEditExecuteBefore(HookEvent $event){
        $session = wire("session");
        $input = wire("input");
        $page = wire('pages')->get($input->get->id);
        $name = $page->name;
        $zip = $config->paths->cache . "${$name}.zip";
        
        if($input->get->downloadImages == "true"){
            wire("log")->save("custom", "excecuted page edit!");
            $array = wire('files')->zip($zip,
                                        $page->get($input->get->field)->explode("filename"),
                                        array("overwrite" => true)  );
            if(!empty($array["errors"])){
                foreach($array["errors"] as $error){
                    $this->error($error);
                }
                return;
            } else{
                header('Content-Type: application/zip');
                header("Content-Disposition: attachment; filename='{$name}.zip'");
                echo readfile($zip);
                return $this->halt();
            }
            
        }
    }
    
    public function afterInputfieldImageRender(HookEvent $event){
        $field = $event->object;
        $input = wire("input");
        $configData = wire('modules')->getModuleConfigData($this);
      
        $out = $event->return;
        
        if(in_array( $field->name, $configData['includeFields'])){

            $button = wire('modules')->get('InputfieldButton');
            $button->class = $button->class . " ExportFieldImages";
            $button->icon = 'download';
            $button->href = "./?downloadImages=true&field={$field->name}&id={$input->get->id}";
            $button->value = "Download Files";
            $btn .= "<span style='display:block; position:relative; float:right;' class='InputfieldPageTableButtons'>" . $button->render() . "</span>";
            $out .= $btn;
        }
        
        $event->return = $out;
        
    }
    
    public function getModuleConfigInputfields(array $data){
        $modules = wire("modules");
        $fields = wire('fields');
        
        $defaults = self::getDefaultConfig();
		$data = array_merge($defaults, $data);
        
        $form = new InputfieldWrapper();
        
        $field = $modules->get("InputfieldAsmSelect");
		$field->name = "includeFields";
		$field->label = __("Fields to enable download button");
		$field->description = __("Choose the image fields where download button should appear");
        foreach($fields as $f){
            if($f->flags & Field::flagSystem) continue;
            if($f->type == "FieldtypeImage" || $f->type == "FieldtypeFile"){
                $field->addOption($f->name);
            }
        }
		$field->value = $data['includeFields'];
		
		$form->add($field);
        return $form;
    }
    
}