Create a page with send image[s] from the frontend.

controller-send.php

<?php

return function($site, $pages, $page) {

	$alert    = null;
	$messages = null;

	if(r::is('post') && get('submit')) {
		if(!empty(get('subject'))) {
			// lets tell the bot that everything is ok
			go($page->url());
			exit;
		}
		$data = array(
			'title' => esc(get('title')),
			'text'  => esc(get('text'))
		);

		$rules = array(
			'title' => array('required'),
			'text'  => array('required'),
		);
		$messages = array(
			'title' => 'Please enter a title',
			'text'  => 'Please enter a short text'
		);

		// some of the data is invalid
		if($invalid = invalid($data, $rules, $messages)) {
			$alert = $invalid;
		} else {

			// everything is ok, let's try to create a new registration
			try {

				$newPage = $page->children()->create(uniqid(), 'default', $data);

				$success = 'The creation of the page was a success';
				$data = array();

				$upload = new Upload($newPage->root() . DS . '{safeFilename}', array(
					'input'     => 'file',
					'overwrite' => true,
					'accept'    => 'image/*'
				));

			} catch(Exception $e) {
				echo 'Creating the page failed: ' . $e->getMessage();
			}
		}
	}

	return compact('alert', 'messages', 'data', 'success');
};

template-send.php

<?php snippet('header') ?>

<main class="main" role="main">

	<h1><?= $page->subtitle()->or($page->title()) ?></h1>

	<?php if(isset($success)): ?>
	<div class="alert success">
		<?php echo html($success) ?>
	</div>
	<?php else: ?>

	<?php if($alert): ?>
	<div class="alert error">
		<p>Make sure you have entered all the information correctly.</div>
	</div>
	<?php endif ?>

	<form enctype="multipart/form-data" id="contactform" method="post">

		<div class="field<?php e(isset($alert['title']), ' error'); ?>">
			<label for="title">Title <abbr title="required">*</abbr></label>
			<input type="text" id="title" name="title" value="<?= isset($data['title']) ? $data['title'] : '' ?>">
		</div>

		<div class="field<?php e(isset($alert['text']), ' error'); ?>">
			<label for="text">Message <abbr title="required">*</abbr></label>
			<textarea id="text" name="text"><?= isset($data['text']) ? $data['text'] : '' ?></textarea>
		</div>

		<div class="field honeypot">
			<label for="subject">Sujet <abbr title="required">*</abbr></label>
			<input type="text" id="subject" name="subject">
		</div>

		<div class="field">
			<label for="file">Choose a file</label>
			<input type="file" name="file[]" id="file" class="inputfile hidden" data-multiple-caption="{count} files selected" multiple="multiple" accept="image/*"/>
		</div>

		<p class="help">All fields with * are required</p>

		<div class="field">
			<button type="submit" name="submit" value="Envoyer">Envoyer</button>
		</div>

	</form>
	<?php endif ?>

</main>

<?php snippet('footer') ?>