<?php

/*
Plugin Name: Enable SMTP
Plugin URI: https://github.com/Automattic
Version: 0.1
Author: <a href="http://wordpress.com/">Atomic</a>
Description: Atomic SMTP plugin
*/

/**
 * Plugin to make wp_mail use SMTP
 */

function atomic_enableSMTP( $phpmailer ) {
	if ( 'cli' == php_sapi_name() ) {
		$smtp_username = DOMAIN_NAME;
	} else {
		$smtp_username = $_SERVER['HTTP_HOST'];
	}
	$phpmailer->Host = '127.0.0.1';
	$phpmailer->Port = AT_SMTP_PORT;
	$phpmailer->SMTPAuth = true;
	$phpmailer->Username = $smtp_username;
	$phpmailer->Password = AT_SMTP_PASS;
	$phpmailer->isSMTP();
}

function atomic_add_mail_tracking_header( $phpmailer ) {
	$trace = debug_backtrace( DEBUG_BACKTRACE_IGNORE_ARGS );

	foreach ( $trace as $idx => $call ) {
		if ( $idx < 5 ) {
			continue;
		}

		if ( in_array( $call['function'], array(
			'do_action',
			'apply_filters',
			'do_action_ref_array',
			__FUNCTION__,
			'wp_mail',
			'html_email_end',
			'html_email_simple_send',
			'wp_html_mail',
		) ) ) {
			continue;
		}

		if ( isset( $call['class'] ) ) {
			if ( in_array( $call['class'], array( 'WordPressMailer' ) ) ) {
				continue;
			}
			if ( is_subclass_of( $call['class'], 'WordPressMailer' ) ) {
				continue;
			}

			$caller = "{$call['class']}->{$call['function']}";
			break;
		}

		$caller = $call['function'];
		break;
	}

	$raw_data = base64_encode( $caller );
	$cron = 0;
	if ( defined( 'DOING_CRON' ) && DOING_CRON ) {
		$cron = 1;
	}
	$ja3_hash = '-';
	if ( isset( $_SERVER['HTTP_X_JA3_HASH'] ) ) {
		$ja3_hash = $_SERVER['HTTP_X_JA3_HASH'];
	}

	$phpmailer->AddCustomHeader( sprintf( 'X-Atomic-Tracking: %d:%d:%s:%d:%d:%d:%d:%s',
		ATOMIC_SITE_ID,
		ATOMIC_CLIENT_ID,
		$raw_data,
		get_current_blog_id(),
		get_the_ID(),
		get_current_user_id(),
		$cron,
		$ja3_hash
	) );

	$phpmailer->AddCustomHeader( sprintf( 'X-Atomic-Caller: %s', $caller ) );
}

add_action( 'phpmailer_init', 'atomic_enableSMTP' );
add_action( 'phpmailer_init', 'atomic_add_mail_tracking_header' );