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<?php
/**
* This file is part of the ZBateson\MailMimeParser project.
*
* @license http://opensource.org/licenses/bsd-license.php BSD
*/
namespace ZBateson\MailMimeParser\Header;
use DateTime;
use ZBateson\MailMimeParser\Header\Consumer\AbstractConsumer;
use ZBateson\MailMimeParser\Header\Consumer\ConsumerService;
use ZBateson\MailMimeParser\Header\Part\CommentPart;
use ZBateson\MailMimeParser\Header\Part\DatePart;
/**
* Represents a Received header.
*
* The returned header value (as returned by a call to {@see
* ReceivedHeader::getValue()}) for a
* ReceivedHeader is the same as the raw value (as returned by a call to
* {@see ReceivedHeader::getRawValue()}) since the header doesn't have a single
* 'value' to consider 'the value'.
*
* The parsed parts of a Received header can be accessed as parameters. To
* check if a part exists, call {@see ReceivedHeader::hasParameter()} with the
* name of the part, for example: ```php $header->hasParameter('from') ``` or
* ```php $header->hasParameter('id') ```. The value of the part can be obtained
* by calling {@see ReceivedHeader::getValueFor()}, for example
* ```php $header->getValueFor('with'); ```.
*
* Additional parsing is performed on the "FROM" and "BY" parts of a received
* header in an attempt to extract the self-identified name of the server, its
* hostname, and its address (depending on what's included). These can be
* accessed directly from the ReceivedHeader object by calling one of the
* following methods:
*
* o {@see ReceivedHeader::getFromName()} -- the name portion of the FROM part
* o {@see ReceivedHeader::getFromHostname()} -- the hostname of the FROM part
* o {@see ReceivedHeader::getFromAddress()} -- the adddress portion of the FROM
* part
* o {@see ReceivedHeader::getByName()} -- same as getFromName, but for the BY
* part, and etc... below
* o {@see ReceivedHeader::getByHostname()}
* o {@see ReceivedHeader::getByAddress()}
*
* The parsed parts of the FROM and BY parts are determined as follows:
*
* o Anything outside and before a parenthesized expression is considered "the
* name", for example "FROM AlainDeBotton", "AlainDeBotton" would be the name,
* but also if the name is an address, but exists outside the parenthesized
* expression, it's still considered "the name". For example:
* "From [1.2.3.4]", getFromName would return "[1.2.3.4]".
* o A parenthesized expression MUST match what looks like either a domain name
* on its own, or a domain name and an address. Otherwise the parenthesized
* expression is considered a comment, and not parsed into hostname and
* address. The rules are defined loosely because many implementations differ
* in how strictly they follow the standard. For a domain, it's enough that
* the expression starts with any alphanumeric character and contains at least
* one '.', followed by any number of '.', '-' and alphanumeric characters.
* The address portion must be surrounded in square brackets, and contain any
* sequence of '.', ':', numbers, and characters 'a' through 'f'. In addition
* the string 'ipv6' may start the expression (for instance, '[ipv6:::1]'
* would be valid). A port number may also be considered valid as part of the
* address, for example: [1.2.3.4:3231]. No additional validation on the
* address is done, and so an invalid address such as '....' could be
* returned, so users using the 'address' header are encouraged to validate it
* before using it. The square brackets are parsed out of the returned
* address, so the value returned by getFromAddress() would be "2.2.2.2", not
* "[2.2.2.2]".
*
* The date/time stamp can be accessed as a DateTime object by calling
* {@see ReceivedHeader::getDateTime()}.
*
* Parsed comments can be accessed by calling {@see
* ReceivedHeader::getComments()}. Some implementations may include connection
* encryption information or other details in non-standardized comments.
*
* @author Zaahid Bateson
*/
class ReceivedHeader extends ParameterHeader
{
/**
* @var string[] an array of comments in the header.
*/
protected $comments = [];
/**
* @var DateTime the date/time stamp in the header.
*/
protected $date = null;
/**
* Returns a ReceivedConsumer.
*
* @return Consumer\AbstractConsumer
*/
protected function getConsumer(ConsumerService $consumerService)
{
return $consumerService->getReceivedConsumer();
}
/**
* Overridden to assign comments to $this->comments, and the DateTime to
* $this->date.
*
* @return static
*/
protected function setParseHeaderValue(AbstractConsumer $consumer)
{
parent::setParseHeaderValue($consumer);
foreach ($this->parts as $part) {
if ($part instanceof CommentPart) {
$this->comments[] = $part->getComment();
} elseif ($part instanceof DatePart) {
$this->date = $part->getDateTime();
}
}
return $this;
}
/**
* Returns the raw, unparsed header value, same as {@see
* ReceivedHeader::getRawValue()}.
*/
public function getValue() : ?string
{
return $this->rawValue;
}
/**
* Returns the name identified in the FROM part of the header or null if not
* defined or the format wasn't parsed.
*
* The returned value may either be a name or an address in the form
* "[1.2.3.4]". Validation is not performed on this value, and so whatever
* exists in this position is returned -- be it contains spaces, or invalid
* characters, etc...
*
* @return string|null The 'FROM' name.
*/
public function getFromName()
{
return (isset($this->parameters['from'])) ?
$this->parameters['from']->getEhloName() : null;
}
/**
* Returns the hostname part of a parenthesized FROM part or null if not
* defined or the format wasn't parsed.
*
* For example, "FROM name (host.name)" would return the string "host.name".
* Validation of the hostname is not performed, and the returned value may
* not be valid. More details on how the value is parsed and extracted can
* be found in the class description for {@see ReceivedHeader}.
*
* @return string|null The 'FROM' hostname.
*/
public function getFromHostname()
{
return (isset($this->parameters['from'])) ?
$this->parameters['from']->getHostname() : null;
}
/**
* Returns the address part of a parenthesized FROM part or null if not
* defined or the format wasn't parsed.
*
* For example, "FROM name ([1.2.3.4])" would return the string "1.2.3.4".
* Validation of the address is not performed, and the returned value may
* not be valid. More details on how the value is parsed and extracted can
* be found in the class description for {@see ReceivedHeader}.
*
* @return string|null The 'FROM' address.
*/
public function getFromAddress()
{
return (isset($this->parameters['from'])) ?
$this->parameters['from']->getAddress() : null;
}
/**
* Returns the name identified in the BY part of the header or null if not
* defined or the format wasn't parsed.
*
* The returned value may either be a name or an address in the form
* "[1.2.3.4]". Validation is not performed on this value, and so whatever
* exists in this position is returned -- be it contains spaces, or invalid
* characters, etc...
*
* @return string|null The 'BY' name.
*/
public function getByName()
{
return (isset($this->parameters['by'])) ?
$this->parameters['by']->getEhloName() : null;
}
/**
* Returns the hostname part of a parenthesized BY part or null if not
* defined or the format wasn't parsed.
*
* For example, "BY name (host.name)" would return the string "host.name".
* Validation of the hostname is not performed, and the returned value may
* not be valid. More details on how the value is parsed and extracted can
* be found in the class description for {@see ReceivedHeader}.
*
* @return string|null The 'BY' hostname.
*/
public function getByHostname()
{
return (isset($this->parameters['by'])) ?
$this->parameters['by']->getHostname() : null;
}
/**
* Returns the address part of a parenthesized BY part or null if not
* defined or the format wasn't parsed.
*
* For example, "BY name ([1.2.3.4])" would return the string "1.2.3.4".
* Validation of the address is not performed, and the returned value may
* not be valid. More details on how the value is parsed and extracted can
* be found in the class description for {@see ReceivedHeader}.
*
* @return string|null The 'BY' address.
*/
public function getByAddress()
{
return (isset($this->parameters['by'])) ?
$this->parameters['by']->getAddress() : null;
}
/**
* Returns an array of comments parsed from the header. If there are no
* comments in the header, an empty array is returned.
*
* @return string[]
*/
public function getComments()
{
return $this->comments;
}
/**
* Returns the date/time stamp for the received header if set, or null
* otherwise.
*
* @return \DateTime|null
*/
public function getDateTime()
{
return $this->date;
}
}