WP custom post type creation form with customized file upload facility

example_upload_form.php

<?php
global $user_identity;
//$user_submissions = get_posts();

if ($user = wp_get_current_user()) {
	$author = array('id' => $user->ID);
} else {
	$commenter = wp_get_current_commenter();
	$author = array(
		'author' => $commenter['comment_author'],
		'email' => $commenter['comment_author_email'],
		'url' => $commenter['comment_author_url'],
		'ip' => preg_replace( '/[^0-9a-fA-F:., ]/', '', $_SERVER['REMOTE_ADDR'] ),
	);
}

$aria_req = " aria-required='true'";
$required_text = sprintf( ' ' . __('(%s marks required fields)'), '<span class="required">*</span>' );
$defaults = array(
	'must_log_in'          => '<p class="must-log-in">' .  sprintf( __( 'You must be <a href="%s">logged in</a> to enter in this contest.' ), wp_login_url( apply_filters( 'the_permalink', get_permalink( $post->ID ) ) ) ) . '</p>',
	'has_submission'       => '<p class="has-submission">You have already made a submission for this contest. Only a single submission per person is permitted.</p>',
	'logged_in_as'         => '<p class="logged-in-as">' . sprintf( __( 'Logged in as <a href="%1$s">%2$s</a>. <a href="%3$s" title="Log out of this account">Log out?</a>' ), admin_url( 'profile.php' ), $user_identity, wp_logout_url( apply_filters( 'the_permalink', get_permalink( $post->ID ) ) ) ) . '</p>',
	'upload_notes_before' => '<p class="comment-notes">' . __( 'Your email address will not be published.' ).$required_text.'</p>',
	'upload_notes_after'  => '<p class="form-allowed-tags">' . sprintf( __( 'You may use these <abbr title="HyperText Markup Language">HTML</abbr> tags and attributes: %s' ), ' <code>' . allowed_tags() . '</code>' ) . '</p>',
	'title'          => __( 'submit your photo' ),
	'label_submit'         => __( 'Upload' ),
);
$args = apply_filters( 'photonomy_form_defaults', $defaults );
?>
<form enctype="multipart/form-data" method="post" action="<?php echo PHOTONOMY_URL."upload.php"; ?>" class="photonomy-upload-form type-form validate" id="photonomy_submission_form">
	<?php
	$max_upload_size = $this->convert_bytes_to_hr($this->get_max_upload_size());
	?>
	<h3><?php echo $args['title']; ?></h3>
	<div id="photonomy-upload-notice">
		<?php if (isset($errors['upload_notice']) ) { ?>
			<?php echo $errors['upload_notice']; ?>
		<?php } ?>
	</div>
	<?php
	$errors = array(
		__('Sorry, you must be logged in to post a comment.'), //1
		__('Please fill the required fields (name, email).'), //2
		__('Please enter a valid email address.'), //4
		__('Error: Sorry, we could not store your photo (only JPEG, PNG and GIF files are allowed).'), //8
		__('Error: Sorry, we could not store your submission.'), //16
		__('Please select a photo to upload.'), //32
		__('You have already made a submission for this contest. Only a single submission per person is permitted.'), //64
	);
	$v = (isset($_REQUEST['errors'])) ? (int)$_REQUEST['errors'] : 0;
	$i = 0;
	while (pow(2,$i) <= $v) {
		$t = pow(2,$i);
		if ((int)($t & $v) == $t) {
			?>
			<div class="photonomy-error"><?php echo $errors[$i]; ?></div>
			<?php
		}
		$i++;
	}
	?>
	<?php
	$messages = array(
		__('Your photo has been submitted to the contest.'), //1
		__('It is pending approval and will become visible after it has been approved.'), //2
	);
	$v = (isset($_REQUEST['messages'])) ? (int)$_REQUEST['messages'] : 0;
	$i = 0;
	while (pow(2,$i) <= $v) {
		$t = pow(2,$i);
		if ((int)($t & $v) == $t) {
			?>
			<div class="photonomy-notice"><?php echo $messages[$i]; ?></div>
			<?php
		}
		$i++;
	}
	if ( !is_user_logged_in() && ($this->options['require_login'] || 'private' == $post->post_status)) {
		?>
		<?php echo $args['must_log_in']; ?>
		<?php
/*	} else if ($this->options['single_submission'] && $this->author_has_submission($post->ID, $author)) {
		?>
		<?php echo $args['has_submission']; ?>
		<?php*/
	} else if ( is_multisite() && !is_upload_space_available() ) {
		echo '<p>'.sprintf( __( 'Sorry, you have filled your storage quota (%s MB).' ), get_space_allowed() ).'</p>';
	} else {
		?>
		<div id="photonomy_upload_ui">
			<?php
			if ( is_user_logged_in() ) {
				echo apply_filters( 'comment_form_logged_in', $args['logged_in_as'], $author, $user_identity );
				do_action( 'comment_form_logged_in_after', $author, $user_identity );
			} else {
				?>
				<?php echo $args['upload_notes_before']; ?>
				<p class="upload-form-author">
					<label for="photonomy_author"><?php _e('Name'); ?></label> <span class="required">*</span>
					<input type="text" name="photonomy_author" id="photonomy_author" value="<?php echo esc_attr( $author['author'] ); ?>" <?php echo $aria_req; ?> />
				</p>
				<p class="upload-form-email">
					<label for="photonomy_email"><?php _e('Email'); ?></label> <span class="required">*</span>
					<input type="text" name="photonomy_email" id="photonomy_email" value="<?php echo esc_attr( $author['email'] ); ?>" <?php echo $aria_req; ?> />
				</p>
				<?php
			}
			?>
			<p id="async-upload-wrap" class="upload-form-file">
				<label for="photonomy_photo"><?php _e('Photo'); ?></label> <span class="required">*</span>
				<input type="file" size="15" name="photonomy_photo" id="photonomy_photo" value="" <?php echo $aria_req; ?> />
				<span class="photonomy-upload-size">
					<?php echo sprintf( __( 'Maximum upload file size: %s' ), $max_upload_size.'B' ); ?>
				</span>
			</p>
			<p class="upload-form-title">
				<label for="photonomy_title"><?php _e('Title'); ?></label>
				<input type="text" name="photonomy_title" id="photonomy_title" <?php echo $aria_req; ?> />
			</p>
			<p class="upload-form-description">
				<label for="photonomy_content"><?php _e('Description'); ?></label>
				<textarea name="photonomy_content" id="photonomy_content"></textarea>
			</p>
			<?php echo $args['upload_notes_after']; ?>
			<p class="form-submit">
				<input type="hidden" name="post_id" value="<?php echo $post->ID; ?>" />
				<input type="hidden" name="redirect_to" value="<?php echo remove_query_arg(array('photonomy_cycle', 'errors', 'messages')); ?>" />
				<input type="submit" class="button" name="photonomy_upload" value="<?php echo esc_attr( $args['label_submit'] ); ?>" />
			</p>
		</div>
		<?php
	}
	?>
</form>