<?php
/*
* This file is part of SwiftMailer.
* (c) 2004-2009 Chris Corbyn
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* A MIME entity, in a multipart message.
*
* @author Chris Corbyn
*/
class Swift_Mime_SimpleMimeEntity implements Swift_Mime_CharsetObserver, Swift_Mime_EncodingObserver
{
/** Main message document; there can only be one of these */
const LEVEL_TOP = 16;
/** An entity which nests with the same precedence as an attachment */
const LEVEL_MIXED = 256;
/** An entity which nests with the same precedence as a mime part */
const LEVEL_ALTERNATIVE = 4096;
/** An entity which nests with the same precedence as embedded content */
const LEVEL_RELATED = 65536;
/** A collection of Headers for this mime entity */
private $headers;
/** The body as a string, or a stream */
private $body;
/** The encoder that encodes the body into a streamable format */
private $encoder;
/** Message ID generator */
private $idGenerator;
/** A mime boundary, if any is used */
private $boundary;
/** Mime types to be used based on the nesting level */
private $compositeRanges = [
'multipart/mixed' => [self::LEVEL_TOP, self::LEVEL_MIXED],
'multipart/alternative' => [self::LEVEL_MIXED, self::LEVEL_ALTERNATIVE],
'multipart/related' => [self::LEVEL_ALTERNATIVE, self::LEVEL_RELATED],
];
/** A set of filter rules to define what level an entity should be nested at */
private $compoundLevelFilters = [];
/** The nesting level of this entity */
private $nestingLevel = self::LEVEL_ALTERNATIVE;
/** A KeyCache instance used during encoding and streaming */
private $cache;
/** Direct descendants of this entity */
private $immediateChildren = [];
/** All descendants of this entity */
private $children = [];
/** The maximum line length of the body of this entity */
private $maxLineLength = 78;
/** The order in which alternative mime types should appear */
private $alternativePartOrder = [
'text/plain' => 1,
'text/html' => 2,
'multipart/related' => 3,
];
/** The CID of this entity */
private $id;
/** The key used for accessing the cache */
private $cacheKey;
protected $userContentType;
/**
* Create a new SimpleMimeEntity with $headers, $encoder and $cache.
*/
public function __construct(Swift_Mime_SimpleHeaderSet $headers, Swift_Mime_ContentEncoder $encoder, Swift_KeyCache $cache, Swift_IdGenerator $idGenerator)
{
$this->cacheKey = bin2hex(random_bytes(16)); // set 32 hex values
$this->cache = $cache;
$this->headers = $headers;
$this->idGenerator = $idGenerator;
$this->setEncoder($encoder);
$this->headers->defineOrdering(['Content-Type', 'Content-Transfer-Encoding']);
// This array specifies that, when the entire MIME document contains
// $compoundLevel, then for each child within $level, if its Content-Type
// is $contentType then it should be treated as if it's level is
// $neededLevel instead. I tried to write that unambiguously! :-\
// Data Structure:
// array (
// $compoundLevel => array(
// $level => array(
// $contentType => $neededLevel
// )
// )
// )
$this->compoundLevelFilters = [
(self::LEVEL_ALTERNATIVE + self::LEVEL_RELATED) => [
self::LEVEL_ALTERNATIVE => [
'text/plain' => self::LEVEL_ALTERNATIVE,
'text/html' => self::LEVEL_RELATED,
],
],
];
$this->id = $this->idGenerator->generateId();
}
/**
* Generate a new Content-ID or Message-ID for this MIME entity.
*
* @return string
*/
public function generateId()
{
$this->setId($this->idGenerator->generateId());
return $this->id;
}
/**
* Get the {@link Swift_Mime_SimpleHeaderSet} for this entity.
*
* @return Swift_Mime_SimpleHeaderSet
*/
public function getHeaders()
{
return $this->headers;
}
/**
* Get the nesting level of this entity.
*
* @see LEVEL_TOP, LEVEL_MIXED, LEVEL_RELATED, LEVEL_ALTERNATIVE
*
* @return int
*/
public function getNestingLevel()
{
return $this->nestingLevel;
}
/**
* Get the Content-type of this entity.
*
* @return string
*/
public function getContentType()
{
return $this->getHeaderFieldModel('Content-Type');
}
/**
* Set the Content-type of this entity.
*
* @param string $type
*
* @return $this
*/
public function setContentType($type)
{
$this->setContentTypeInHeaders($type);
// Keep track of the value so that if the content-type changes automatically
// due to added child entities, it can be restored if they are later removed
$this->userContentType = $type;
return $this;
}
/**
* Get the CID of this entity.
*
* The CID will only be present in headers if a Content-ID header is present.
*
* @return string
*/
public function getId()
{
$tmp = (array) $this->getHeaderFieldModel($this->getIdField());
return $this->headers->has($this->getIdField()) ? current($tmp) : $this->id;
}
/**
* Set the CID of this entity.
*
* @param string $id
*
* @return $this
*/
public function setId($id)
{
if (!$this->setHeaderFieldModel($this->getIdField(), $id)) {
$this->headers->addIdHeader($this->getIdField(), $id);
}
$this->id = $id;
return $this;
}
/**
* Get the description of this entity.
*
* This value comes from the Content-Description header if set.
*
* @return string
*/
public function getDescription()
{
return $this->getHeaderFieldModel('Content-Description');
}
/**
* Set the description of this entity.
*
* This method sets a value in the Content-ID header.
*
* @param string $description
*
* @return $this
*/
public function setDescription($description)
{
if (!$this->setHeaderFieldModel('Content-Description', $description)) {
$this->headers->addTextHeader('Content-Description', $description);
}
return $this;
}
/**
* Get the maximum line length of the body of this entity.
*
* @return int
*/
public function getMaxLineLength()
{
return $this->maxLineLength;
}
/**
* Set the maximum line length of lines in this body.
*
* Though not enforced by the library, lines should not exceed 1000 chars.
*
* @param int $length
*
* @return $this
*/
public function setMaxLineLength($length)
{
$this->maxLineLength = $length;
return $this;
}
/**
* Get all children added to this entity.
*
* @return Swift_Mime_SimpleMimeEntity[]
*/
public function getChildren()
{
return $this->children;
}
/**
* Set all children of this entity.
*
* @param Swift_Mime_SimpleMimeEntity[] $children
* @param int $compoundLevel For internal use only
*
* @return $this
*/
public function setChildren(array $children, $compoundLevel = null)
{
// TODO: Try to refactor this logic
$compoundLevel = $compoundLevel ?? $this->getCompoundLevel($children);
$immediateChildren = [];
$grandchildren = [];
$newContentType = $this->userContentType;
foreach ($children as $child) {
$level = $this->getNeededChildLevel($child, $compoundLevel);
if (empty($immediateChildren)) {
//first iteration
$immediateChildren = [$child];
} else {
$nextLevel = $this->getNeededChildLevel($immediateChildren[0], $compoundLevel);
if ($nextLevel == $level) {
$immediateChildren[] = $child;
} elseif ($level < $nextLevel) {
// Re-assign immediateChildren to grandchildren
$grandchildren = array_merge($grandchildren, $immediateChildren);
// Set new children
$immediateChildren = [$child];
} else {
$grandchildren[] = $child;
}
}
}
if ($immediateChildren) {
$lowestLevel = $this->getNeededChildLevel($immediateChildren[0], $compoundLevel);
// Determine which composite media type is needed to accommodate the
// immediate children
foreach ($this->compositeRanges as $mediaType => $range) {
if ($lowestLevel > $range[0] && $lowestLevel <= $range[1]) {
$newContentType = $mediaType;
break;
}
}
// Put any grandchildren in a subpart
if (!empty($grandchildren)) {
$subentity = $this->createChild();
$subentity->setNestingLevel($lowestLevel);
$subentity->setChildren($grandchildren, $compoundLevel);
array_unshift($immediateChildren, $subentity);
}
}
$this->immediateChildren = $immediateChildren;
$this->children = $children;
$this->setContentTypeInHeaders($newContentType);
$this->fixHeaders();
$this->sortChildren();
return $this;
}
/**
* Get the body of this entity as a string.
*
* @return string
*/
public function getBody()
{
return $this->body instanceof Swift_OutputByteStream ? $this->readStream($this->body) : $this->body;
}
/**
* Set the body of this entity, either as a string, or as an instance of
* {@link Swift_OutputByteStream}.
*
* @param mixed $body
* @param string $contentType optional
*
* @return $this
*/
public function setBody($body, $contentType = null)
{
if ($body !== $this->body) {
$this->clearCache();
}
$this->body = $body;
if (isset($contentType)) {
$this->setContentType($contentType);
}
return $this;
}
/**
* Get the encoder used for the body of this entity.
*
* @return Swift_Mime_ContentEncoder
*/
public function getEncoder()
{
return $this->encoder;
}
/**
* Set the encoder used for the body of this entity.
*
* @return $this
*/
public function setEncoder(Swift_Mime_ContentEncoder $encoder)
{
if ($encoder !== $this->encoder) {
$this->clearCache();
}
$this->encoder = $encoder;
$this->setEncoding($encoder->getName());
$this->notifyEncoderChanged($encoder);
return $this;
}
/**
* Get the boundary used to separate children in this entity.
*
* @return string
*/
public function getBoundary()
{
if (!isset($this->boundary)) {
$this->boundary = '_=_swift_'.time().'_'.bin2hex(random_bytes(16)).'_=_';
}
return $this->boundary;
}
/**
* Set the boundary used to separate children in this entity.
*
* @param string $boundary
*
* @throws Swift_RfcComplianceException
*
* @return $this
*/
public function setBoundary($boundary)
{
$this->assertValidBoundary($boundary);
$this->boundary = $boundary;
return $this;
}
/**
* Receive notification that the charset of this entity, or a parent entity
* has changed.
*
* @param string $charset
*/
public function charsetChanged($charset)
{
$this->notifyCharsetChanged($charset);
}
/**
* Receive notification that the encoder of this entity or a parent entity
* has changed.
*/
public function encoderChanged(Swift_Mime_ContentEncoder $encoder)
{
$this->notifyEncoderChanged($encoder);
}
/**
* Get this entire entity as a string.
*
* @return string
*/
public function toString()
{
$string = $this->headers->toString();
$string .= $this->bodyToString();
return $string;
}
/**
* Get this entire entity as a string.
*
* @return string
*/
protected function bodyToString()
{
$string = '';
if (isset($this->body) && empty($this->immediateChildren)) {
if ($this->cache->hasKey($this->cacheKey, 'body')) {
$body = $this->cache->getString($this->cacheKey, 'body');
} else {
$body = "\r\n".$this->encoder->encodeString($this->getBody(), 0, $this->getMaxLineLength());
$this->cache->setString($this->cacheKey, 'body', $body, Swift_KeyCache::MODE_WRITE);
}
$string .= $body;
}
if (!empty($this->immediateChildren)) {
foreach ($this->immediateChildren as $child) {
$string .= "\r\n\r\n--".$this->getBoundary()."\r\n";
$string .= $child->toString();
}
$string .= "\r\n\r\n--".$this->getBoundary()."--\r\n";
}
return $string;
}
/**
* Returns a string representation of this object.
*
* @see toString()
*
* @return string
*/
public function __toString()
{
return $this->toString();
}
/**
* Write this entire entity to a {@see Swift_InputByteStream}.
*/
public function toByteStream(Swift_InputByteStream $is)
{
$is->write($this->headers->toString());
$is->commit();
$this->bodyToByteStream($is);
}
/**
* Write this entire entity to a {@link Swift_InputByteStream}.
*/
protected function bodyToByteStream(Swift_InputByteStream $is)
{
if (empty($this->immediateChildren)) {
if (isset($this->body)) {
if ($this->cache->hasKey($this->cacheKey, 'body')) {
$this->cache->exportToByteStream($this->cacheKey, 'body', $is);
} else {
$cacheIs = $this->cache->getInputByteStream($this->cacheKey, 'body');
if ($cacheIs) {
$is->bind($cacheIs);
}
$is->write("\r\n");
if ($this->body instanceof Swift_OutputByteStream) {
$this->body->setReadPointer(0);
$this->encoder->encodeByteStream($this->body, $is, 0, $this->getMaxLineLength());
} else {
$is->write($this->encoder->encodeString($this->getBody(), 0, $this->getMaxLineLength()));
}
if ($cacheIs) {
$is->unbind($cacheIs);
}
}
}
}
if (!empty($this->immediateChildren)) {
foreach ($this->immediateChildren as $child) {
$is->write("\r\n\r\n--".$this->getBoundary()."\r\n");
$child->toByteStream($is);
}
$is->write("\r\n\r\n--".$this->getBoundary()."--\r\n");
}
}
/**
* Get the name of the header that provides the ID of this entity.
*/
protected function getIdField()
{
return 'Content-ID';
}
/**
* Get the model data (usually an array or a string) for $field.
*/
protected function getHeaderFieldModel($field)
{
if ($this->headers->has($field)) {
return $this->headers->get($field)->getFieldBodyModel();
}
}
/**
* Set the model data for $field.
*/
protected function setHeaderFieldModel($field, $model)
{
if ($this->headers->has($field)) {
$this->headers->get($field)->setFieldBodyModel($model);
return true;
}
return false;
}
/**
* Get the parameter value of $parameter on $field header.
*/
protected function getHeaderParameter($field, $parameter)
{
if ($this->headers->has($field)) {
return $this->headers->get($field)->getParameter($parameter);
}
}
/**
* Set the parameter value of $parameter on $field header.
*/
protected function setHeaderParameter($field, $parameter, $value)
{
if ($this->headers->has($field)) {
$this->headers->get($field)->setParameter($parameter, $value);
return true;
}
return false;
}
/**
* Re-evaluate what content type and encoding should be used on this entity.
*/
protected function fixHeaders()
{
if (count($this->immediateChildren)) {
$this->setHeaderParameter('Content-Type', 'boundary',
$this->getBoundary()
);
$this->headers->remove('Content-Transfer-Encoding');
} else {
$this->setHeaderParameter('Content-Type', 'boundary', null);
$this->setEncoding($this->encoder->getName());
}
}
/**
* Get the KeyCache used in this entity.
*
* @return Swift_KeyCache
*/
protected function getCache()
{
return $this->cache;
}
/**
* Get the ID generator.
*
* @return Swift_IdGenerator
*/
protected function getIdGenerator()
{
return $this->idGenerator;
}
/**
* Empty the KeyCache for this entity.
*/
protected function clearCache()
{
$this->cache->clearKey($this->cacheKey, 'body');
}
private function readStream(Swift_OutputByteStream $os)
{
$string = '';
while (false !== $bytes = $os->read(8192)) {
$string .= $bytes;
}
$os->setReadPointer(0);
return $string;
}
private function setEncoding($encoding)
{
if (!$this->setHeaderFieldModel('Content-Transfer-Encoding', $encoding)) {
$this->headers->addTextHeader('Content-Transfer-Encoding', $encoding);
}
}
private function assertValidBoundary($boundary)
{
if (!preg_match('/^[a-z0-9\'\(\)\+_\-,\.\/:=\?\ ]{0,69}[a-z0-9\'\(\)\+_\-,\.\/:=\?]$/Di', $boundary)) {
throw new Swift_RfcComplianceException('Mime boundary set is not RFC 2046 compliant.');
}
}
private function setContentTypeInHeaders($type)
{
if (!$this->setHeaderFieldModel('Content-Type', $type)) {
$this->headers->addParameterizedHeader('Content-Type', $type);
}
}
private function setNestingLevel($level)
{
$this->nestingLevel = $level;
}
private function getCompoundLevel($children)
{
$level = 0;
foreach ($children as $child) {
$level |= $child->getNestingLevel();
}
return $level;
}
private function getNeededChildLevel($child, $compoundLevel)
{
$filter = [];
foreach ($this->compoundLevelFilters as $bitmask => $rules) {
if (($compoundLevel & $bitmask) === $bitmask) {
$filter = $rules + $filter;
}
}
$realLevel = $child->getNestingLevel();
$lowercaseType = strtolower($child->getContentType());
if (isset($filter[$realLevel]) && isset($filter[$realLevel][$lowercaseType])) {
return $filter[$realLevel][$lowercaseType];
}
return $realLevel;
}
private function createChild()
{
return new self($this->headers->newInstance(), $this->encoder, $this->cache, $this->idGenerator);
}
private function notifyEncoderChanged(Swift_Mime_ContentEncoder $encoder)
{
foreach ($this->immediateChildren as $child) {
$child->encoderChanged($encoder);
}
}
private function notifyCharsetChanged($charset)
{
$this->encoder->charsetChanged($charset);
$this->headers->charsetChanged($charset);
foreach ($this->immediateChildren as $child) {
$child->charsetChanged($charset);
}
}
private function sortChildren()
{
$shouldSort = false;
foreach ($this->immediateChildren as $child) {
// NOTE: This include alternative parts moved into a related part
if (self::LEVEL_ALTERNATIVE == $child->getNestingLevel()) {
$shouldSort = true;
break;
}
}
// Sort in order of preference, if there is one
if ($shouldSort) {
// Group the messages by order of preference
$sorted = [];
foreach ($this->immediateChildren as $child) {
$type = $child->getContentType();
$level = array_key_exists($type, $this->alternativePartOrder) ? $this->alternativePartOrder[$type] : max($this->alternativePartOrder) + 1;
if (empty($sorted[$level])) {
$sorted[$level] = [];
}
$sorted[$level][] = $child;
}
ksort($sorted);
$this->immediateChildren = array_reduce($sorted, 'array_merge', []);
}
}
/**
* Empties it's own contents from the cache.
*/
public function __destruct()
{
if ($this->cache instanceof Swift_KeyCache) {
$this->cache->clearAll($this->cacheKey);
}
}
/**
* Make a deep copy of object.
*/
public function __clone()
{
$this->headers = clone $this->headers;
$this->encoder = clone $this->encoder;
$this->cacheKey = bin2hex(random_bytes(16)); // set 32 hex values
$children = [];
foreach ($this->children as $pos => $child) {
$children[$pos] = clone $child;
}
$this->setChildren($children);
}
}