f-stop.php

<?php

/**
 * Post "Reads" to F-Stop, a feed reader not unlike Aperture.
 */
add_filter( 'wp_insert_post_data', function( $data, $postarr ) {
	if ( ! empty( $postarr['ID'] ) ) {
		// Not a new post. Bail.
		return $data;
	}

	if ( empty( $postarr['meta_input']['mf2_read-of'][0] ) ) {
		// Not a "Read" post.
		return $data;
	}

	// These are optional, really.
	$data['post_type']   = 'iwcpt_read'; // My CPT.
	$data['post_status'] = 'draft'; // I save Reads as draft.

	// This is where the magic happens.
	if ( defined( 'FSTOP_READ_IT_LATER_TOKEN' ) ) {
		wp_remote_post(
			esc_url_raw( 'https://fstop.cloud/micropub' ),
			array(
				'headers' => array(
					'Authorization' => 'Bearer ' . FSTOP_READ_IT_LATER_TOKEN,
					'Content-type'  => 'application/x-www-form-urlencoded',
				),
				'body'    => array(
					'h'       => 'entry',
					'read-of' => strtok( $postarr['meta_input']['mf2_read-of'][0], '?' ), // Strip query string.
				),
				'timeout' => 15,
			)
		);
		strtok( '', '' ); // Clear up some memory?
	}

	return $data; // Always return `$data`!
}, 20, 2 );