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<?php
namespace Laminas\Mail\Storage;
use Laminas\Mail\Storage\Exception\ExceptionInterface;
use Laminas\Mail\Storage\Message\File;
use Laminas\Mail\Storage\Message\MessageInterface;
use Laminas\Stdlib\ErrorHandler;
use function array_combine;
use function count;
use function fclose;
use function fgets;
use function filemtime;
use function fopen;
use function fseek;
use function ftell;
use function is_dir;
use function is_resource;
use function is_subclass_of;
use function range;
use function str_starts_with;
use function stream_get_contents;
use function strlen;
use function strtolower;
use function trim;
use const E_WARNING;
class Mbox extends AbstractStorage
{
/**
* file handle to mbox file
*
* @var null|resource
*/
protected $fh;
/**
* filename of mbox file for __wakeup
*
* @var string
*/
protected $filename;
/**
* modification date of mbox file for __wakeup
*
* @var int
*/
protected $filemtime;
/**
* start and end position of messages as array('start' => start, 'separator' => headersep, 'end' => end)
*
* @var array
*/
protected $positions;
/**
* used message class, change it in an extended class to extend the returned message class
*
* @var class-string<MessageInterface>
*/
protected $messageClass = File::class;
/**
* end of Line for messages
*
* @var string|null
*/
// phpcs:ignore WebimpressCodingStandard.NamingConventions.ValidVariableName.NotCamelCapsProperty
protected $messageEOL;
/**
* Count messages all messages in current box
*
* @return int number of messages
* @throws ExceptionInterface
*/
public function countMessages()
{
return count($this->positions);
}
/**
* Get a list of messages with number and size
*
* @param int|null $id number of message or null for all messages
* @return int|array size of given message of list with all messages as array(num => size)
*/
public function getSize($id = 0)
{
if ($id) {
$pos = $this->positions[$id - 1];
return $pos['end'] - $pos['start'];
}
$result = [];
foreach ($this->positions as $num => $pos) {
$result[$num + 1] = $pos['end'] - $pos['start'];
}
return $result;
}
/**
* Get positions for mail message or throw exception if id is invalid
*
* @param int $id number of message
* @throws Exception\InvalidArgumentException
* @return array positions as in positions
*/
protected function getPos($id)
{
if (! isset($this->positions[$id - 1])) {
throw new Exception\InvalidArgumentException('id does not exist');
}
return $this->positions[$id - 1];
}
/**
* Fetch a message
*
* @param int $id number of message
* @return File
* @throws ExceptionInterface
*/
public function getMessage($id)
{
// TODO that's ugly, would be better to let the message class decide
if (
is_subclass_of($this->messageClass, File::class)
|| strtolower($this->messageClass) === strtolower(File::class)
) {
// TODO top/body lines
$messagePos = $this->getPos($id);
$messageClassParams = [
'file' => $this->fh,
'startPos' => $messagePos['start'],
'endPos' => $messagePos['end'],
];
if (isset($this->messageEOL)) {
$messageClassParams['EOL'] = $this->messageEOL;
}
return new $this->messageClass($messageClassParams);
}
/** @todo Uncomment once we know how to count body lines */
// $bodyLines = 0;
$message = $this->getRawHeader($id);
/* Once we know how to count body lines, we should uncomment the
* following, which would append the body content to the headers.
*
if ($bodyLines) {
$message .= "\n";
while ($bodyLines-- && ftell($this->fh) < $this->positions[$id - 1]['end']) {
$message .= fgets($this->fh);
}
}
*/
return new $this->messageClass(['handler' => $this, 'id' => $id, 'headers' => $message]);
}
/**
* Get raw header of message or part
*
* @param int $id number of message
* @param null|array|string $part path to part or null for message header
* @param int $topLines include this many lines with header (after an empty line)
* @return string raw header
* @throws \Laminas\Mail\Protocol\Exception\ExceptionInterface
* @throws ExceptionInterface
*/
public function getRawHeader($id, $part = null, $topLines = 0)
{
if ($part !== null) {
// TODO: implement
throw new Exception\RuntimeException('not implemented');
}
$messagePos = $this->getPos($id);
// TODO: toplines
return stream_get_contents($this->fh, $messagePos['separator'] - $messagePos['start'], $messagePos['start']);
}
/**
* Get raw content of message or part
*
* @param int $id number of message
* @param null|array|string $part path to part or null for message content
* @return string raw content
* @throws \Laminas\Mail\Protocol\Exception\ExceptionInterface
* @throws ExceptionInterface
*/
public function getRawContent($id, $part = null)
{
if ($part !== null) {
// TODO: implement
throw new Exception\RuntimeException('not implemented');
}
$messagePos = $this->getPos($id);
return stream_get_contents($this->fh, $messagePos['end'] - $messagePos['separator'], $messagePos['separator']);
}
/**
* Create instance with parameters
* Supported parameters are:
* - filename filename of mbox file
*
* @param array|object|Config $params mail reader specific parameters
* @throws Exception\InvalidArgumentException
*/
public function __construct($params)
{
$params = ParamsNormalizer::normalizeParams($params);
if (! isset($params['filename'])) {
throw new Exception\InvalidArgumentException('no valid filename given in params');
}
if (isset($params['messageEOL'])) {
$this->messageEOL = (string) $params['messageEOL'];
}
$this->openMboxFile((string) $params['filename']);
$this->has['top'] = true;
$this->has['uniqueid'] = false;
}
/**
* check if given file is a mbox file
*
* if $file is a resource its file pointer is moved after the first line
*
* @param resource|string $file stream resource of name of file
* @param bool $fileIsString file is string or resource
* @return bool file is mbox file
*/
protected function isMboxFile($file, $fileIsString = true)
{
if ($fileIsString) {
ErrorHandler::start(E_WARNING);
$file = fopen($file, 'r');
ErrorHandler::stop();
if (! $file) {
return false;
}
} else {
fseek($file, 0);
}
$result = false;
$line = fgets($file) ?: '';
if (str_starts_with($line, 'From ')) {
$result = true;
}
if ($fileIsString) {
ErrorHandler::start(E_WARNING);
fclose($file);
ErrorHandler::stop();
}
return $result;
}
/**
* open given file as current mbox file
*
* @param string $filename filename of mbox file
* @throws Exception\RuntimeException
* @throws Exception\InvalidArgumentException
*/
protected function openMboxFile($filename)
{
if ($this->fh) {
$this->close();
}
if (is_dir($filename)) {
throw new Exception\InvalidArgumentException('file is not a valid mbox file');
}
ErrorHandler::start();
$this->fh = fopen($filename, 'r');
$error = ErrorHandler::stop();
if (! $this->fh) {
throw new Exception\RuntimeException('cannot open mbox file', 0, $error);
}
$this->filename = $filename;
$this->filemtime = filemtime($this->filename);
if (! $this->isMboxFile($this->fh, false)) {
ErrorHandler::start(E_WARNING);
fclose($this->fh);
$error = ErrorHandler::stop();
throw new Exception\InvalidArgumentException('file is not a valid mbox format', 0, $error);
}
$messagePos = ['start' => ftell($this->fh), 'separator' => 0, 'end' => 0];
while (($line = fgets($this->fh)) !== false) {
if (str_starts_with($line, 'From ')) {
$messagePos['end'] = ftell($this->fh) - strlen($line) - 2; // + newline
if (! $messagePos['separator']) {
$messagePos['separator'] = $messagePos['end'];
}
$this->positions[] = $messagePos;
$messagePos = ['start' => ftell($this->fh), 'separator' => 0, 'end' => 0];
}
if (! $messagePos['separator'] && ! trim($line)) {
$messagePos['separator'] = ftell($this->fh);
}
}
$messagePos['end'] = ftell($this->fh);
if (! $messagePos['separator']) {
$messagePos['separator'] = $messagePos['end'];
}
$this->positions[] = $messagePos;
}
/**
* Close resource for mail lib. If you need to control, when the resource
* is closed. Otherwise the destructor would call this.
*/
public function close()
{
if (is_resource($this->fh)) {
fclose($this->fh);
}
$this->positions = [];
}
/**
* Waste some CPU cycles doing nothing.
*
* @return bool always return true
*/
public function noop()
{
return true;
}
/**
* stub for not supported message deletion
*
* @param int $id message number
* @throws Exception\RuntimeException
*/
public function removeMessage($id)
{
throw new Exception\RuntimeException('mbox is read-only');
}
/**
* get unique id for one or all messages
*
* Mbox does not support unique ids (yet) - it's always the same as the message number.
* That shouldn't be a problem, because we can't change mbox files. Therefor the message
* number is save enough.
*
* @param int|null $id message number
* @return array|string message number for given message or all messages as array
* @throws ExceptionInterface
*/
public function getUniqueId($id = null)
{
if ($id) {
// check if id exists
$this->getPos($id);
return $id;
}
$range = range(1, $this->countMessages());
return array_combine($range, $range);
}
/**
* get a message number from a unique id
*
* I.e. if you have a webmailer that supports deleting messages you should use unique ids
* as parameter and use this method to translate it to message number right before calling removeMessage()
*
* @param string $id unique id
* @return int message number
* @throws ExceptionInterface
*/
public function getNumberByUniqueId($id)
{
// check if id exists
$this->getPos($id);
return $id;
}
/**
* magic method for serialize()
*
* with this method you can cache the mbox class
*
* @return array name of variables
*/
public function __sleep()
{
return ['filename', 'positions', 'filemtime'];
}
/**
* magic method for unserialize()
*
* with this method you can cache the mbox class
* for cache validation the mtime of the mbox file is used
*
* @throws Exception\RuntimeException
*/
public function __wakeup()
{
ErrorHandler::start();
$filemtime = filemtime($this->filename);
ErrorHandler::stop();
if ($this->filemtime != $filemtime) {
$this->close();
$this->openMboxFile($this->filename);
} else {
ErrorHandler::start();
$this->fh = fopen($this->filename, 'r');
$error = ErrorHandler::stop();
if (! $this->fh) {
throw new Exception\RuntimeException('cannot open mbox file', 0, $error);
}
}
}
}