Genkgo\Mail\Dkim\CanonicalizeBodyRelaxed

Complexity

Total Complexity

12

Size/Duplication

Total Lines	78
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	0

Importance

Changes

0

2 Methods

Rating	Name	Duplication	Size	Complexity
C	canonicalize()	0	62	11
A	name()	0	4	1

<?php
declare(strict_types=1);

namespace Genkgo\Mail\Dkim;

use Genkgo\Mail\StreamInterface;

final class CanonicalizeBodyRelaxed implements CanonicalizeBodyInterface
{

    /**
     * @param StreamInterface $body
     * @return string
     */
    public function canonicalize(StreamInterface $body): string
    {
        $string = (string)$body;

        $length = strlen($string);
        $canon = '';
        $lastChar = null;
        $space = false;
        $line = '';
        $emptyCounter = 0;

        for ($i = 0; $i < $length; ++$i) {
            switch ($string[$i]) {
                case "\r":
                    $lastChar = "\r";
                    break;

                case "\n":
                    if ($lastChar === "\r") {
                        $space = false;

                        if ($line === '') {
                            ++$emptyCounter;
                        } else {
                            $line = '';
                            $canon .= "\r\n";
                        }
                    } else {
                        throw new \RuntimeException('This should never happen');
                    }

                    break;

                case ' ':
                case "\t":
                    $space = true;
                    break;

                default:
                    if ($emptyCounter > 0) {
                        $canon .= str_repeat("\r\n", $emptyCounter);
                        $emptyCounter = 0;
                    }

                    if ($space) {
                        $line .= ' ';
                        $canon .= ' ';
                        $space = false;
                    }

                    $line .= $string[$i];
                    $canon .= $string[$i];
                    break;
            }
        }

        if (substr($canon, -2, 2) === "\r\n") {
            return rtrim($canon, "\r\n") . "\r\n";
        }

        return $canon;
    }

    /**
     * @return string
     */
    public static function name(): string
    {
        return 'relaxed';
    }
}