Short code to accept JetPack sign-ups

Creates short code `ccom_jetpack_follow` presenting a form accepting into the connected JetPack Subscriptions.

// Shortcode Form
add_shortcode( 'ccom_jetpack_follow', function( $atts ) {

	if( empty( $atts['redirect'] ) ) {
		return;
	}

	ob_start();
	?>
	<form method="POST" action="">
		<input type="hidden" name="ccom_jetpack_follow" value= "1" />
		<input type="hidden" name="redirect" value= "<?php echo $atts['redirect']; ?>" />
		<input type="email" name="email" required="required"
			placeholder="Enter your email address" aria-label="Enter your email address" />
		<input type="submit" value="Download the Presentation (PDF)" />
	</form>
	<?php

	return ob_get_clean();

} );

// Submissions
add_action( 'template_redirect', function() {

	// Get Vars
	$action = isset( $_REQUEST['email'] )
		? esc_attr( $_REQUEST['email'] ) : '';
	$email = isset( $_REQUEST['email'] )
		? esc_attr( $_REQUEST['email'] ) : '';
	$redirect = isset( $_REQUEST['redirect'] )
		? esc_attr( $_REQUEST['redirect'] ) : '';

	// Detect Submission
	if( ! $action === 'ccom_jetpack_follow' || ! $email || ! $redirect ) {
		return;
	}

	// JetPack Required
	if( ! class_exists( 'Jetpack_Subscriptions' ) ) {
		return;
	}

	// Handle Post ID Provided
	if( intval( $redirect ) ) {
		$redirect = wp_get_attachment_url( $redirect );
	}

	// Subscribe To JetPack
	$response = Jetpack_Subscriptions::subscribe(
		$email, 0, false
	);

	// Redirect
	wp_redirect( $redirect );
	exit;

} );

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