/**
* Adds all attachments to the email.
*
* @return string
*/
private function attachAll() : string
{
$mime = [];
foreach ($this->email->attachments as $attachment) {
$encoding = !empty($attachment->encoding) ? $attachment->encoding : Encoding::BASE64;
$name = $this->changeCharset($this->clearHeaderValue($attachment->name));
$mime[] = '--' . $this->boundary[1] . self::LINE_END;
$mime[] = 'Content-Type: ' . $this->clearHeaderValue($attachment->mimeType) . ';' . self::LINE_END;
$mime[] = ' name="' . $this->encodeHeader($name) . '"' . self::LINE_END;
$mime[] = 'Content-Transfer-Encoding: ' . $encoding . self::LINE_END;
if ($attachment->isInline()) {
$mime[] = 'Content-ID: <' . $this->clearHeaderValue($attachment->cid) . '>' . self::LINE_END;
}
$mime[] = 'Content-Disposition: ' . $attachment->disposition . ';' . self::LINE_END;
$mime[] = ' filename="' . $this->encodeHeader($name) . '"' . self::LINE_END . self::LINE_END;
// Just fix line endings in case of encoded attachments, encode otherwise
$mime[] = !empty($attachment->encoding) ? \Jyxo\StringUtil::fixLineEnding($attachment->content, self::LINE_END) : $this->encodeString($attachment->content, $encoding);
$mime[] = self::LINE_END . self::LINE_END;
}
$mime[] = '--' . $this->boundary[1] . '--' . self::LINE_END;
return implode('', $mime);
}
/**
* Encodes a string using the quoted-printable encoding.
*
* @param string $string Input string
* @param integer $lineLength Line length
* @param string $lineEnd Line ending
* @return string
*/
private static function encodeQuotedPrintable(string $string, int $lineLength, string $lineEnd) : string
{
$encoded = \Jyxo\StringUtil::fixLineEnding(trim($string), $lineEnd);
// Replaces all high ASCII characters, control codes and '='
$encoded = preg_replace_callback('~([\\000-\\010\\013\\014\\016-\\037\\075\\177-\\377])~', function ($matches) {
return '=' . sprintf('%02X', ord($matches[1]));
}, $encoded);
// Replaces tabs and spaces if on line ends
$encoded = preg_replace_callback('~([\\011\\040])' . $lineEnd . '~', function ($matches) use($lineEnd) {
return '=' . sprintf('%02X', ord($matches[1])) . $lineEnd;
}, $encoded);
$output = '';
$lines = explode($lineEnd, $encoded);
// Release from memory
unset($encoded);
foreach ($lines as $line) {
// Line length is less than maximum
if (strlen($line) <= $lineLength) {
$output .= $line . $lineEnd;
continue;
}
do {
$partLength = strlen($line);
if ($partLength > $lineLength) {
$partLength = $lineLength;
}
// Cannot break a line in the middle of a character
$pos = strrpos(substr($line, 0, $partLength), '=');
if (false !== $pos && $pos >= $partLength - 2) {
$partLength = $pos;
}
// If the last char is a break, move one character backwards
if ($partLength > 0 && ' ' == $line[$partLength - 1]) {
$partLength--;
}
// Saves string parts, trims the string and continues
$output .= substr($line, 0, $partLength);
$line = substr($line, $partLength);
// We are in the middle of a line
if (!empty($line)) {
$output .= '=';
}
$output .= $lineEnd;
} while (!empty($line));
}
return $output;
}
