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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2013 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Mail;
use ArrayIterator;
use Countable;
use Iterator;
use Traversable;
use Zend\Loader\PluginClassLocator;
/**
* Basic mail headers collection functionality
*
* Handles aggregation of headers
*/
class Headers implements Countable, Iterator
{
/** @var string End of Line for fields */
const EOL = "\r\n";
/** @var string Start of Line when folding */
const FOLDING = "\r\n ";
/**
* @var \Zend\Loader\PluginClassLoader
*/
protected $pluginClassLoader = null;
/**
* @var array key names for $headers array
*/
protected $headersKeys = array();
/**
* @var Header\HeaderInterface[] instances
*/
protected $headers = array();
/**
* Header encoding; defaults to ASCII
*
* @var string
*/
protected $encoding = 'ASCII';
/**
* Populates headers from string representation
*
* Parses a string for headers, and aggregates them, in order, in the
* current instance, primarily as strings until they are needed (they
* will be lazy loaded)
*
* @param string $string
* @param string $EOL EOL string; defaults to {@link EOL}
* @throws Exception\RuntimeException
* @return Headers
*/
public static function fromString($string, $EOL = self::EOL)
{
$headers = new static();
$currentLine = '';
// iterate the header lines, some might be continuations
foreach (explode($EOL, $string) as $line) {
// check if a header name is present
if (preg_match('/^(?P<name>[\x21-\x39\x3B-\x7E]+):.*$/', $line, $matches)) {
if ($currentLine) {
// a header name was present, then store the current complete line
$headers->addHeaderLine($currentLine);
}
$currentLine = trim($line);
} elseif (preg_match('/^\s+.*$/', $line, $matches)) {
// continuation: append to current line
$currentLine .= trim($line);
} elseif (preg_match('/^\s*$/', $line)) {
// empty line indicates end of headers
break;
} else {
// Line does not match header format!
throw new Exception\RuntimeException(sprintf(
'Line "%s"does not match header format!',
$line
));
}
}
if ($currentLine) {
$headers->addHeaderLine($currentLine);
}
return $headers;
}
/**
* Set an alternate implementation for the PluginClassLoader
*
* @param PluginClassLocator $pluginClassLoader
* @return Headers
*/
public function setPluginClassLoader(PluginClassLocator $pluginClassLoader)
{
$this->pluginClassLoader = $pluginClassLoader;
return $this;
}
/**
* Return an instance of a PluginClassLocator, lazyload and inject map if necessary
*
* @return PluginClassLocator
*/
public function getPluginClassLoader()
{
if ($this->pluginClassLoader === null) {
$this->pluginClassLoader = new Header\HeaderLoader();
}
return $this->pluginClassLoader;
}
/**
* Set the header encoding
*
* @param string $encoding
* @return Headers
*/
public function setEncoding($encoding)
{
$this->encoding = $encoding;
foreach ($this as $header) {
$header->setEncoding($encoding);
}
return $this;
}
/**
* Get the header encoding
*
* @return string
*/
public function getEncoding()
{
return $this->encoding;
}
/**
* Add many headers at once
*
* Expects an array (or Traversable object) of type/value pairs.
*
* @param array|Traversable $headers
* @throws Exception\InvalidArgumentException
* @return Headers
*/
public function addHeaders($headers)
{
if (!is_array($headers) && !$headers instanceof Traversable) {
throw new Exception\InvalidArgumentException(sprintf(
'Expected array or Traversable; received "%s"',
(is_object($headers) ? get_class($headers) : gettype($headers))
));
}
foreach ($headers as $name => $value) {
if (is_int($name)) {
if (is_string($value)) {
$this->addHeaderLine($value);
} elseif (is_array($value) && count($value) == 1) {
$this->addHeaderLine(key($value), current($value));
} elseif (is_array($value) && count($value) == 2) {
$this->addHeaderLine($value[0], $value[1]);
} elseif ($value instanceof Header\HeaderInterface) {
$this->addHeader($value);
}
} elseif (is_string($name)) {
$this->addHeaderLine($name, $value);
}
}
return $this;
}
/**
* Add a raw header line, either in name => value, or as a single string 'name: value'
*
* This method allows for lazy-loading in that the parsing and instantiation of HeaderInterface object
* will be delayed until they are retrieved by either get() or current()
*
* @throws Exception\InvalidArgumentException
* @param string $headerFieldNameOrLine
* @param string $fieldValue optional
* @return Headers
*/
public function addHeaderLine($headerFieldNameOrLine, $fieldValue = null)
{
if (!is_string($headerFieldNameOrLine)) {
throw new Exception\InvalidArgumentException(sprintf(
'%s expects its first argument to be a string; received "%s"',
(is_object($headerFieldNameOrLine) ? get_class($headerFieldNameOrLine) : gettype($headerFieldNameOrLine))
));
}
if ($fieldValue === null) {
$this->addHeader(Header\GenericHeader::fromString($headerFieldNameOrLine));
} elseif (is_array($fieldValue)) {
foreach ($fieldValue as $i) {
$this->addHeader(new Header\GenericMultiHeader($headerFieldNameOrLine, $i));
}
} else {
$this->addHeader(new Header\GenericHeader($headerFieldNameOrLine, $fieldValue));
}
return $this;
}
/**
* Add a Header\Interface to this container, for raw values see {@link addHeaderLine()} and {@link addHeaders()}
*
* @param Header\HeaderInterface $header
* @return Headers
*/
public function addHeader(Header\HeaderInterface $header)
{
$key = $this->normalizeFieldName($header->getFieldName());
$this->headersKeys[] = $key;
$this->headers[] = $header;
if ($this->getEncoding() !== 'ASCII') {
$header->setEncoding($this->getEncoding());
}
return $this;
}
/**
* Remove a Header from the container
*
* @param string $fieldName
* @return bool
*/
public function removeHeader($fieldName)
{
$key = $this->normalizeFieldName($fieldName);
$index = array_search($key, $this->headersKeys, true);
if ($index !== false) {
unset($this->headersKeys[$index]);
unset($this->headers[$index]);
return true;
}
return false;
}
/**
* Clear all headers
*
* Removes all headers from queue
*
* @return Headers
*/
public function clearHeaders()
{
$this->headers = $this->headersKeys = array();
return $this;
}
/**
* Get all headers of a certain name/type
*
* @param string $name
* @return bool|ArrayIterator|Header\HeaderInterface Returns false if there is no headers with $name in this
* contain, an ArrayIterator if the header is a MultipleHeadersInterface instance and finally returns
* HeaderInterface for the rest of cases.
*/
public function get($name)
{
$key = $this->normalizeFieldName($name);
$results = array();
foreach (array_keys($this->headersKeys, $key) as $index) {
if ($this->headers[$index] instanceof Header\GenericHeader) {
$results[] = $this->lazyLoadHeader($index);
} else {
$results[] = $this->headers[$index];
}
}
switch (count($results)) {
case 0:
return false;
case 1:
if ($results[0] instanceof Header\MultipleHeadersInterface) {
return new ArrayIterator($results);
} else {
return $results[0];
}
default:
return new ArrayIterator($results);
}
}
/**
* Test for existence of a type of header
*
* @param string $name
* @return bool
*/
public function has($name)
{
$name = $this->normalizeFieldName($name);
return in_array($name, $this->headersKeys);
}
/**
* Advance the pointer for this object as an iterator
*
*/
public function next()
{
next($this->headers);
}
/**
* Return the current key for this object as an iterator
*
* @return mixed
*/
public function key()
{
return key($this->headers);
}
/**
* Is this iterator still valid?
*
* @return bool
*/
public function valid()
{
return (current($this->headers) !== false);
}
/**
* Reset the internal pointer for this object as an iterator
*
*/
public function rewind()
{
reset($this->headers);
}
/**
* Return the current value for this iterator, lazy loading it if need be
*
* @return Header\HeaderInterface
*/
public function current()
{
$current = current($this->headers);
if ($current instanceof Header\GenericHeader) {
$current = $this->lazyLoadHeader(key($this->headers));
}
return $current;
}
/**
* Return the number of headers in this contain, if all headers have not been parsed, actual count could
* increase if MultipleHeader objects exist in the Request/Response. If you need an exact count, iterate
*
* @return int count of currently known headers
*/
public function count()
{
return count($this->headers);
}
/**
* Render all headers at once
*
* This method handles the normal iteration of headers; it is up to the
* concrete classes to prepend with the appropriate status/request line.
*
* @return string
*/
public function toString()
{
$headers = '';
foreach ($this->headers as $header) {
if ($str = $header->toString()) {
$headers .= $str . self::EOL;
}
}
return $headers;
}
/**
* Return the headers container as an array
*
* @todo determine how to produce single line headers, if they are supported
* @return array
*/
public function toArray()
{
$headers = array();
/* @var $header Header\HeaderInterface */
foreach ($this->headers as $header) {
if ($header instanceof Header\MultipleHeadersInterface) {
$name = $header->getFieldName();
if (!isset($headers[$name])) {
$headers[$name] = array();
}
$headers[$name][] = $header->getFieldValue();
} else {
$headers[$header->getFieldName()] = $header->getFieldValue();
}
}
return $headers;
}
/**
* By calling this, it will force parsing and loading of all headers, after this count() will be accurate
*
* @return bool
*/
public function forceLoading()
{
foreach ($this as $item) {
// $item should now be loaded
}
return true;
}
/**
* @param $index
* @return mixed
*/
protected function lazyLoadHeader($index)
{
$current = $this->headers[$index];
$key = $this->headersKeys[$index];
/* @var $class Header\HeaderInterface */
$class = ($this->getPluginClassLoader()->load($key)) ?: 'Zend\Mail\Header\GenericHeader';
$encoding = $current->getEncoding();
$headers = $class::fromString($current->toString());
if (is_array($headers)) {
$current = array_shift($headers);
$current->setEncoding($encoding);
$this->headers[$index] = $current;
foreach ($headers as $header) {
$header->setEncoding($encoding);
$this->headersKeys[] = $key;
$this->headers[] = $header;
}
return $current;
}
$current = $headers;
$current->setEncoding($encoding);
$this->headers[$index] = $current;
return $current;
}
/**
* Normalize a field name
*
* @param string $fieldName
* @return string
*/
protected function normalizeFieldName($fieldName)
{
return str_replace(array('-', '_', ' ', '.'), '', strtolower($fieldName));
}
}
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