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<?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.
* @package Swift
* @subpackage Mime
* @author Chris Corbyn
*/
class Swift_Mime_SimpleMimeEntity implements Swift_Mime_MimeEntity
{
/** 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;
/** The grammar to use for id validation */
private $_grammar;
/** A mime bounary, if any is used */
private $_boundary;
/** Mime types to be used based on the nesting level */
private $_compositeRanges = array(
'multipart/mixed' => array(self::LEVEL_TOP, self::LEVEL_MIXED),
'multipart/alternative' => array(self::LEVEL_MIXED, self::LEVEL_ALTERNATIVE),
'multipart/related' => array(self::LEVEL_ALTERNATIVE, self::LEVEL_RELATED)
);
/** A set of filter rules to define what level an entity should be nested at */
private $_compoundLevelFilters = array();
/** 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 = array();
/** All descendants of this entity */
private $_children = array();
/** The maximum line length of the body of this entity */
private $_maxLineLength = 78;
/** The order in which alternative mime types should appear */
private $_alternativePartOrder = array(
'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.
* @param Swift_Mime_HeaderSet $headers
* @param Swift_Mime_ContentEncoder $encoder
* @param Swift_KeyCache $cache
* @param Swift_Mime_Grammar $grammar
*/
public function __construct(Swift_Mime_HeaderSet $headers,
Swift_Mime_ContentEncoder $encoder, Swift_KeyCache $cache,
Swift_Mime_Grammar $grammar)
{
$this->_cacheKey = uniqid();
$this->_cache = $cache;
$this->_headers = $headers;
$this->_grammar = $grammar;
$this->setEncoder($encoder);
$this->_headers->defineOrdering(
array('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 = array(
(self::LEVEL_ALTERNATIVE + self::LEVEL_RELATED) => array(
self::LEVEL_ALTERNATIVE => array(
'text/plain' => self::LEVEL_ALTERNATIVE,
'text/html' => self::LEVEL_RELATED
)
)
);
$this->_id = $this->getRandomId();
}
/**
* Generate a new Content-ID or Message-ID for this MIME entity.
* @return string
*/
public function generateId()
{
$this->setId($this->getRandomId());
return $this->_id;
}
/**
* Get the {@link Swift_Mime_HeaderSet} for this entity.
* @return Swift_Mime_HeaderSet
*/
public function getHeaders()
{
return $this->_headers;
}
/**
* Get the nesting level of this entity.
* @return int
* @see LEVEL_TOP, LEVEL_MIXED, LEVEL_RELATED, LEVEL_ALTERNATIVE
*/
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 $type
*/
public function setContentType($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()
{
return $this->_headers->has($this->_getIdField())
? current((array) $this->_getHeaderFieldModel($this->_getIdField()))
: $this->_id;
}
/**
* Set the CID of this entity.
* @param string $id
*/
public function setId($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 $description
*/
public function setDescription($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 $length
*/
public function setMaxLineLength($length)
{
$this->_maxLineLength = $length;
return $this;
}
/**
* Get all children added to this entity.
* @return array of Swift_Mime_Entity
*/
public function getChildren()
{
return $this->_children;
}
/**
* Set all children of this entity.
* @param array $children Swiift_Mime_Entity instances
* @param int $compoundLevel For internal use only
*/
public function setChildren(array $children, $compoundLevel = null)
{
//TODO: Try to refactor this logic
$compoundLevel = isset($compoundLevel)
? $compoundLevel
: $this->_getCompoundLevel($children)
;
$immediateChildren = array();
$grandchildren = array();
$newContentType = $this->_userContentType;
foreach ($children as $child)
{
$level = $this->_getNeededChildLevel($child, $compoundLevel);
if (empty($immediateChildren)) //first iteration
{
$immediateChildren = array($child);
}
else
{
$nextLevel = $this->_getNeededChildLevel($immediateChildren[0], $compoundLevel);
if ($nextLevel == $level)
{
$immediateChildren[] = $child;
}
elseif ($level < $nextLevel)
{
//Re-assign immediateChildren to grandchilden
$grandchildren = array_merge($grandchildren, $immediateChildren);
//Set new children
$immediateChildren = array($child);
}
else
{
$grandchildren[] = $child;
}
}
}
if (!empty($immediateChildren))
{
$lowestLevel = $this->_getNeededChildLevel($immediateChildren[0], $compoundLevel);
//Determine which composite media type is needed to accomodate the
// immediate children
foreach ($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 $contentType optional
*/
public function setBody($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.
* @param Swift_Mime_ContentEncoder $encoder
*/
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_v4_' . time() . uniqid() . '_=_';
}
return $this->_boundary;
}
/**
* Set the boundary used to separate children in this entity.
* @param string $boundary
* @throws Swift_RfcComplianceException
*/
public function setBoundary($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.
* @param Swift_Mime_ContentEncoder $encoder
*/
public function encoderChanged(Swift_Mime_ContentEncoder $encoder)
{
$this->_notifyEncoderChanged($encoder);
}
/**
* Get this entire entity as a string.
* @return string
*/
public function toString()
{
$string = $this->_headers->toString();
if (isset($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.
*
* @return string
*
* @see toString()
*/
public function __toString()
{
return $this->toString();
}
/**
* Write this entire entity to a {@link Swift_InputByteStream}.
* @param Swift_InputByteStream
*/
public function toByteStream(Swift_InputByteStream $is)
{
$is->write($this->_headers->toString());
$is->commit();
if (empty($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");
}
}
// -- Protected methods
/**
* 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;
}
else
{
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, $value);
return true;
}
else
{
return false;
}
}
/**
* Re-evaluate what content type and encoding should be used on this entity.
*/
protected function _fixHeaders()
{
if (count($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.
*/
protected function _getCache()
{
return $this->_cache;
}
/**
* Get the grammar used for validation.
* @return Swift_Mime_Grammar
*/
protected function _getGrammar()
{
return $this->_grammar;
}
/**
* Empty the KeyCache for this entity.
*/
protected function _clearCache()
{
$this->_cache->clearKey($this->_cacheKey, 'body');
}
/**
* Returns a random Content-ID or Message-ID.
* @return string
*/
protected function getRandomId()
{
$idLeft = time() . '.' . uniqid();
$idRight = !empty($_SERVER['SERVER_NAME'])
? $_SERVER['SERVER_NAME']
: 'swift.generated';
$id = $idLeft . '@' . $idRight;
try
{
$this->_assertValidId($id);
}
catch (Swift_RfcComplianceException $e)
{
$id = $idLeft . '@swift.generated';
}
return $id;
}
// -- Private methods
private function _readStream(Swift_OutputByteStream $os)
{
$string = '';
while (false !== $bytes = $os->read(8192))
{
$string .= $bytes;
}
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)
{
$filter = array();
foreach ($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];
}
else
{
return $realLevel;
}
}
private function _createChild()
{
return new self($this->_headers->newInstance(),
$this->_encoder, $this->_cache, $this->_grammar);
}
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 $child)
{
//NOTE: This include alternative parts moved into a related part
if ($child->getNestingLevel() == self::LEVEL_ALTERNATIVE)
{
$shouldSort = true;
break;
}
}
//Sort in order of preference, if there is one
if ($shouldSort)
{
usort($this->_immediateChildren, array($this, '_childSortAlgorithm'));
}
}
private function _childSortAlgorithm($a, $b)
{
$typePrefs = array();
$types = array(
strtolower($a->getContentType()),
strtolower($b->getContentType())
);
foreach ($types as $type)
{
$typePrefs[] = (array_key_exists($type, $this->_alternativePartOrder))
? $this->_alternativePartOrder[$type]
: (max($this->_alternativePartOrder) + 1);
}
return ($typePrefs[0] >= $typePrefs[1]) ? 1 : -1;
}
// -- Destructor
/**
* Empties it's own contents from the cache.
*/
public function __destruct()
{
$this->_cache->clearAll($this->_cacheKey);
}
/**
* Throws an Exception if the id passed does not comply with RFC 2822.
* @param string $id
* @throws Swift_RfcComplianceException
*/
private function _assertValidId($id)
{
if (!preg_match(
'/^' . $this->_grammar->getDefinition('id-left') . '@' .
$this->_grammar->getDefinition('id-right') . '$/D',
$id
))
{
throw new Swift_RfcComplianceException(
'Invalid ID given <' . $id . '>'
);
}
}
}