FormsService.php

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<?php

namespace Elgg;

use Elgg\Exceptions\LogicException;
use Elgg\Traits\Loggable;

class FormsService {

    use Loggable;

    protected $events;
    
    protected $views;

    protected $rendering;

    protected $footer = '';

    public function __construct(ViewsService $views, EventsService $events) {
        $this->views = $views;
        $this->events = $events;
    }

    public function render(string $action, array $form_vars = [], array $body_vars = []): string {

        $defaults = [
            'action' => elgg_generate_action_url($action, [], false),
            'method' => 'post',
            'ajax' => false,
            'sticky_enabled' => false,
            'sticky_form_name' => $action,
            'sticky_ignored_fields' => [],
        ];

        // append elgg-form class to any class options set
        $form_vars['class'] = elgg_extract_class($form_vars, [
            'elgg-form-' . preg_replace('/[^a-z0-9]/i', '-', $action)],
        );
        
        $form_vars = array_merge($defaults, $form_vars);

        if (!isset($form_vars['enctype']) && strtolower($form_vars['method']) == 'post') {
            $form_vars['enctype'] = 'multipart/form-data';
        }

        if (elgg_extract('ajax', $form_vars)) {
            $form_vars['class'][] = 'elgg-js-ajax-form';
            unset($form_vars['ajax']);
        }

        $form_vars['action_name'] = $action;
        
        $form_vars['ignore_empty_body'] = (bool) elgg_extract('ignore_empty_body', $form_vars, false);
        
        $form_vars['prevent_double_submit'] = (bool) elgg_extract('prevent_double_submit', $form_vars, true);
        
        if (!isset($form_vars['body'])) {
            // prepare body vars
            $body_vars = (array) $this->events->triggerResults('form:prepare:fields', $action, $form_vars, $body_vars);
            
            $this->rendering = true;
            $this->footer = '';

            // Render form body
            $body = $this->views->renderView("forms/{$action}", $body_vars);

            if (!empty($body)) {
                // Grab the footer if one was set during form rendering
                $body .= $this->views->renderView('elements/forms/footer', [
                    'footer' => $this->getFooter(),
                    'action_name' => $action,
                    'body_vars' => $body_vars,
                    'form_vars' => $form_vars,
                ]);
            }
            
            $this->rendering = false;

            $form_vars['body'] = $body;
        }

        return elgg_view('input/form', $form_vars);
    }

    public function setFooter(string $footer = ''): void {
        if (!$this->rendering) {
            throw new LogicException('Form footer can only be set and retrieved during form rendering, anywhere in elgg_view_form() call stack (e.g. form view, extending views, or view events)');
        }

        $this->footer = $footer;
    }

    public function getFooter(): string {
        if (!$this->rendering) {
            throw new LogicException('Form footer can only be set and retrieved during form rendering, anywhere in elgg_view_form() call stack (e.g. form view, extending views, or view events)');
        }

        return $this->footer;
    }
}