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<?php
namespace Laminas\Mail\Storage;
use ArrayIterator;
use Laminas\Mail\Header\HeaderInterface;
use Laminas\Mail\Headers;
use Laminas\Mime;
use Laminas\Mime\Exception\RuntimeException;
use RecursiveIterator;
use ReturnTypeWillChange;
use Stringable;
use function array_map;
use function count;
use function current;
use function implode;
use function is_array;
use function iterator_to_array;
use function preg_replace;
use function stripos;
use function strlen;
use function strtolower;
use function trim;
class Part implements RecursiveIterator, Part\PartInterface, Stringable
{
/**
* Headers of the part
*
* @var Headers|null
*/
protected $headers;
/**
* raw part body
*
* @var null|string
*/
protected $content;
/**
* toplines as fetched with headers
*
* @var string
*/
protected $topLines = '';
/**
* parts of multipart message
*
* @var array
*/
protected $parts = [];
/**
* count of parts of a multipart message
*
* @var null|int
*/
protected $countParts;
/**
* current position of iterator
*
* @var int
*/
protected $iterationPos = 1;
/**
* mail handler, if late fetch is active
*
* @var null|AbstractStorage
*/
protected $mail;
/**
* message number for mail handler
*
* @var int
*/
protected $messageNum = 0;
/**
* Public constructor
*
* Part supports different sources for content. The possible params are:
* - handler an instance of AbstractStorage for late fetch
* - id number of message for handler
* - raw raw content with header and body as string
* - headers headers as array (name => value) or string, if a content part is found it's used as toplines
* - noToplines ignore content found after headers in param 'headers'
* - content content as string
* - strict strictly parse raw content
*
* @param array $params full message with or without headers
* @throws Exception\InvalidArgumentException
*/
public function __construct(array $params)
{
if (isset($params['handler'])) {
if (! $params['handler'] instanceof AbstractStorage) {
throw new Exception\InvalidArgumentException('handler is not a valid mail handler');
}
if (! isset($params['id'])) {
throw new Exception\InvalidArgumentException('need a message id with a handler');
}
$this->mail = $params['handler'];
$this->messageNum = $params['id'];
}
$params['strict'] ??= false;
if (isset($params['raw'])) {
Mime\Decode::splitMessage(
$params['raw'],
$this->headers,
$this->content,
Mime\Mime::LINEEND,
$params['strict']
);
} elseif (isset($params['headers'])) {
if (is_array($params['headers'])) {
$this->headers = new Headers();
$this->headers->addHeaders($params['headers']);
} else {
if (empty($params['noToplines'])) {
Mime\Decode::splitMessage($params['headers'], $this->headers, $this->topLines);
} else {
$this->headers = Headers::fromString($params['headers']);
}
}
if (isset($params['content'])) {
$this->content = $params['content'];
}
}
}
/**
* Check if part is a multipart message
*
* @return bool if part is multipart
*/
public function isMultipart()
{
try {
return stripos($this->contentType, 'multipart/') === 0;
} catch (Exception\ExceptionInterface) {
return false;
}
}
/**
* Body of part
*
* If part is multipart the raw content of this part with all sub parts is returned
*
* @throws Exception\RuntimeException
* @return string body
*/
public function getContent()
{
if ($this->content !== null) {
return $this->content;
}
if ($this->mail) {
return $this->mail->getRawContent($this->messageNum);
}
throw new Exception\RuntimeException('no content');
}
/**
* Return size of part
*
* Quite simple implemented currently (not decoding). Handle with care.
*
* @return int size
*/
public function getSize()
{
return strlen($this->getContent());
}
/**
* Cache content and split in parts if multipart
*
* @throws Exception\RuntimeException
* @return void
*/
protected function cacheContent()
{
// caching content if we can't fetch parts
if ($this->content === null && $this->mail) {
$this->content = $this->mail->getRawContent($this->messageNum);
}
if (! $this->isMultipart()) {
return;
}
// split content in parts
$boundary = $this->getHeaderField('content-type', 'boundary');
if (! $boundary) {
throw new Exception\RuntimeException('no boundary found in content type to split message');
}
$parts = Mime\Decode::splitMessageStruct($this->content, $boundary);
if ($parts === null) {
return;
}
$counter = 1;
foreach ($parts as $part) {
$this->parts[$counter++] = new static(['headers' => $part['header'], 'content' => $part['body']]);
}
}
/**
* Get part of multipart message
*
* @param int $num number of part starting with 1 for first part
* @throws Exception\RuntimeException
* @return Part wanted part
*/
public function getPart($num)
{
if (isset($this->parts[$num])) {
return $this->parts[$num];
}
if (! $this->mail && $this->content === null) {
throw new Exception\RuntimeException('part not found');
}
// if ($this->mail && $this->mail->hasFetchPart) {
// TODO: fetch part
// return
// }
$this->cacheContent();
if (! isset($this->parts[$num])) {
throw new Exception\RuntimeException('part not found');
}
return $this->parts[$num];
}
/**
* Count parts of a multipart part
*
* @return int number of sub-parts
*/
public function countParts()
{
if ($this->countParts) {
return $this->countParts;
}
$this->countParts = count($this->parts);
if ($this->countParts) {
return $this->countParts;
}
// if ($this->mail && $this->mail->hasFetchPart) {
// TODO: fetch part
// return
// }
$this->cacheContent();
$this->countParts = count($this->parts);
return $this->countParts;
}
/**
* Access headers collection
*
* Lazy-loads if not already attached.
*
* @return Headers
* @throws Exception\RuntimeException
*/
public function getHeaders()
{
if (null === $this->headers) {
if ($this->mail) {
$part = $this->mail->getRawHeader($this->messageNum);
$this->headers = Headers::fromString($part);
} else {
$this->headers = new Headers();
}
}
if (! $this->headers instanceof Headers) {
throw new Exception\RuntimeException(
'$this->headers must be an instance of Headers'
);
}
return $this->headers;
}
/**
* Get a header in specified format
*
* Internally headers that occur more than once are saved as array, all other as string. If $format
* is set to string implode is used to concat the values (with Mime::LINEEND as delim).
*
* @param string $name name of header, matches case-insensitive, but camel-case is replaced with dashes
* @param string $format change type of return value to 'string' or 'array'
* @throws Exception\InvalidArgumentException
* @return string|array|HeaderInterface|ArrayIterator value of header in wanted or internal format
*/
public function getHeader($name, $format = null)
{
$header = $this->getHeaders()->get($name);
if ($header === false) {
$lowerName = strtolower(preg_replace('%([a-z])([A-Z])%', '\1-\2', $name));
$header = $this->getHeaders()->get($lowerName);
if ($header === false) {
throw new Exception\InvalidArgumentException(
"Header with Name $name or $lowerName not found"
);
}
}
switch ($format) {
case 'string':
if ($header instanceof HeaderInterface) {
$return = $header->getFieldValue(HeaderInterface::FORMAT_RAW);
} else {
$return = trim(implode(
Mime\Mime::LINEEND,
array_map(static fn($header): string
=> $header->getFieldValue(HeaderInterface::FORMAT_RAW), iterator_to_array($header))
), Mime\Mime::LINEEND);
}
break;
case 'array':
if ($header instanceof HeaderInterface) {
$return = [$header->getFieldValue()];
} else {
$return = [];
foreach ($header as $h) {
$return[] = $h->getFieldValue(HeaderInterface::FORMAT_RAW);
}
}
break;
default:
$return = $header;
}
return $return;
}
/**
* Get a specific field from a header like content type or all fields as array
*
* If the header occurs more than once, only the value from the first header
* is returned.
*
* Throws an Exception if the requested header does not exist. If
* the specific header field does not exist, returns null.
*
* @param string $name name of header, like in getHeader()
* @param string $wantedPart the wanted part, default is first, if null an array with all parts is returned
* @param string $firstName key name for the first part
* @return string|array wanted part or all parts as array($firstName => firstPart, partname => value)
* @throws RuntimeException
*/
public function getHeaderField($name, $wantedPart = '0', $firstName = '0')
{
return Mime\Decode::splitHeaderField(current($this->getHeader($name, 'array')), $wantedPart, $firstName);
}
/**
* Getter for mail headers - name is matched in lowercase
*
* This getter is short for Part::getHeader($name, 'string')
*
* @see Part::getHeader()
*
* @param string $name header name
* @return string value of header
* @throws Exception\ExceptionInterface
*/
public function __get($name)
{
return $this->getHeader($name, 'string');
}
/**
* Isset magic method proxy to hasHeader
*
* This method is short syntax for Part::hasHeader($name);
*
* @see Part::hasHeader
*
* @param string $name
* @return bool
*/
public function __isset($name)
{
return $this->getHeaders()->has($name);
}
/**
* magic method to get content of part
*
* @return string content
*/
public function __toString(): string
{
return $this->getContent();
}
/**
* implements RecursiveIterator::hasChildren()
*
* @return bool current element has children/is multipart
*/
#[ReturnTypeWillChange]
public function hasChildren()
{
$current = $this->current();
return $current && $current instanceof self && $current->isMultipart();
}
/**
* implements RecursiveIterator::getChildren()
*
* @return Part same as self::current()
*/
#[ReturnTypeWillChange]
public function getChildren()
{
return $this->current();
}
/**
* implements Iterator::valid()
*
* @return bool check if there's a current element
*/
#[ReturnTypeWillChange]
public function valid()
{
if ($this->countParts === null) {
$this->countParts();
}
return $this->iterationPos && $this->iterationPos <= $this->countParts;
}
/**
* implements Iterator::next()
*/
#[ReturnTypeWillChange]
public function next()
{
++$this->iterationPos;
}
/**
* implements Iterator::key()
*
* @return string key/number of current part
*/
#[ReturnTypeWillChange]
public function key()
{
return $this->iterationPos;
}
/**
* implements Iterator::current()
*
* @return Part current part
*/
#[ReturnTypeWillChange]
public function current()
{
return $this->getPart($this->iterationPos);
}
/**
* implements Iterator::rewind()
*/
#[ReturnTypeWillChange]
public function rewind()
{
$this->countParts();
$this->iterationPos = 1;
}
}