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<?php
namespace Laminas\Mail\Header;
use function in_array;
use function preg_match;
use function strtolower;
class MimeVersion implements HeaderInterface
{
/** @var string Version string */
protected $version = '1.0';
/**
* @param string $headerLine
* @return static
*/
public static function fromString($headerLine)
{
[$name, $value] = GenericHeader::splitHeaderLine($headerLine);
$value = HeaderWrap::mimeDecodeValue($value);
// check to ensure proper header type for this factory
if (! in_array(strtolower($name), ['mimeversion', 'mime_version', 'mime-version'])) {
throw new Exception\InvalidArgumentException('Invalid header line for MIME-Version string');
}
// Check for version, and set if found
$header = new static();
if (preg_match('/^(?P<version>\d+\.\d+)$/', $value, $matches)) {
$header->setVersion($matches['version']);
}
return $header;
}
/**
* @return string
*/
public function getFieldName()
{
return 'MIME-Version';
}
/**
* @inheritDoc
*/
public function getFieldValue($format = HeaderInterface::FORMAT_RAW)
{
return $this->version;
}
/**
* @param string $encoding
* @return self
*/
public function setEncoding($encoding)
{
// This header must be always in US-ASCII
return $this;
}
/**
* @return string
*/
public function getEncoding()
{
return 'ASCII';
}
/**
* @return string
*/
public function toString()
{
return 'MIME-Version: ' . $this->getFieldValue();
}
/**
* Set the version string used in this header
*
* @param string $version
* @return MimeVersion
*/
public function setVersion($version)
{
if (! preg_match('/^[1-9]\d*\.\d+$/', $version)) {
throw new Exception\InvalidArgumentException('Invalid MIME-Version value detected');
}
$this->version = $version;
return $this;
}
/**
* Retrieve the version string for this header
*
* @return string
*/
public function getVersion()
{
return $this->version;
}
}