press-this.php

<?php

/**
 * Turns posts created through "Press This" into "read" posts.
 */
add_filter( 'press_this_save_post', function( $data ) {
	$data['post_type'] = 'iwcpt_read';

	$content = wp_unslash( $data['post_content'] );

	if ( preg_match_all( '~<blockquote>(.+?)</blockquote>~', $content, $matches ) ) {
		for ( $i = 0; $i < count( $matches[0] ); $i++ ) {
			$content = str_replace( $matches[0][$i], "\n> " . $matches[1][$i], $content );
		}
	}

	$content = trim( $content );

	if ( preg_match( '~Source: <em><a href="(.+?)">(?:.*?)</a></em>~', $content, $matches ) ) {
		$url     = $matches[1];
		$content = str_replace( $matches[0], '', $content );
		$content = '<i>Wants to read <a class="u-read-of" href="' . $url . '">' . $url . "</a>.</i>\n\n" . $content;
	}

	$content = preg_replace( '~<p>\s*</p>~', '', $content );
	$content = trim( $content );

	$data['post_content'] = wp_slash( $content );

	global $wpdb;

	// Generate a random slug. (The IWCPT plugin will _not_ do this for us, as
	// this callback runs _after_ the post's already been created.)
	do {
		$slug = bin2hex( openssl_random_pseudo_bytes( 5 ) );

		// Check uniqueness.
		$result = $wpdb->get_var( $wpdb->prepare( "SELECT post_name FROM $wpdb->posts WHERE post_name = %s LIMIT 1", $slug ) );
	} while ( $result ); // If an identical slug already exists, repeat.

	$data['post_name'] = $slug;

	if ( ! empty( $url ) ) {
		// Add post to my reader's Read Later "feed." To do: move this to
		// another hook?
		wp_remote_post(
			esc_url_raw( 'https://fstop.cloud/micropub' ),
			array(
				'headers' => array(
					'Authorization' => 'Bearer ' . '<my-secret-token>',
					'Content-type'  => 'application/x-www-form-urlencoded',
				),
				'body'    => array(
					'h'       => 'entry',
					'read-of' => $url,
				),
				'timeout' => 15,
			)
		);
	}

	return $data;
} );