<?php
/**
* This file is part of the ZBateson\MailMimeParser project.
*
* @license http://opensource.org/licenses/bsd-license.php BSD
*/
namespace ZBateson\MailMimeParser\Parser;
use Psr\Log\LogLevel;
use ZBateson\MailMimeParser\Message\PartHeaderContainer;
/**
* Reads headers from an input stream, adding them to a PartHeaderContainer.
*
* @author Zaahid Bateson
*/
class HeaderParserService
{
/**
* Ensures the header isn't empty and contains a colon separator character,
* then splits it and adds it to the passed PartHeaderContainer.
*
* @param int $offset read offset for error reporting
* @param string $header the header line
* @param PartHeaderContainer $headerContainer the container
*/
private function addRawHeaderToPart(int $offset, string $header, PartHeaderContainer $headerContainer) : static
{
if ($header !== '') {
if (\strpos($header, ':') !== false) {
$a = \explode(':', $header, 2);
$headerContainer->add($a[0], \trim($a[1]));
} else {
$headerContainer->addError(
"Invalid header found at offset: $offset",
LogLevel::ERROR
);
}
}
return $this;
}
/**
* Reads header lines up to an empty line, adding them to the passed
* PartHeaderContainer.
*
* @param resource $handle The resource handle to read from.
* @param PartHeaderContainer $container the container to add headers to.
*/
public function parse($handle, PartHeaderContainer $container) : static
{
$header = '';
do {
$offset = \ftell($handle);
$line = MessageParserService::readLine($handle);
if ($line === false || $line === '' || $line[0] !== "\t" && $line[0] !== ' ') {
$this->addRawHeaderToPart($offset, $header, $container);
$header = '';
} else {
$line = "\r\n" . $line;
}
$header .= \rtrim($line, "\r\n");
} while ($header !== '');
return $this;
}
}