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<?php
namespace YOOtheme\Http\Message;
use Psr\Http\Message\StreamInterface;
class Stream implements StreamInterface
{
/**
* @var resource
*/
protected $resource;
/**
* @var array
*/
protected $metadata;
/**
* @var array
*/
protected static $modes = [
'readable' => ['r', 'r+', 'w+', 'a+', 'x+', 'c+'],
'writable' => ['r+', 'w', 'w+', 'a', 'a+', 'x', 'x+', 'c', 'c+'],
];
/**
* Constructor.
*
* @param string|resource $resource
* @param string $mode
*/
public function __construct($resource = null, $mode = 'r')
{
$resource = $resource ?: fopen('php://temp', 'r+');
if (is_string($resource)) {
$resource = fopen($resource, $mode);
}
if (!is_resource($resource)) {
throw new \InvalidArgumentException('Invalid resource');
}
$this->resource = $resource;
$this->metadata = stream_get_meta_data($resource);
}
/**
* Destructor.
*/
public function __destruct()
{
$this->close();
}
/**
* @inheritdoc
*/
public function __toString()
{
try {
$this->rewind();
return $this->getContents();
} catch (\RuntimeException $e) {
return '';
}
}
/**
* @inheritdoc
*/
public function close()
{
if (isset($this->resource)) {
if (is_resource($this->resource)) {
fclose($this->resource);
}
$this->detach();
}
}
/**
* @inheritdoc
*/
public function detach()
{
if (!isset($this->resource)) {
return;
}
$result = $this->resource;
unset($this->resource);
return $result;
}
/**
* @inheritdoc
*/
public function getSize()
{
if (!isset($this->resource)) {
return;
}
if ($this->getMetadata('uri')) {
clearstatcache(true, $this->getMetadata('uri'));
}
$stats = fstat($this->resource);
return isset($stats['size']) ? $stats['size'] : null;
}
/**
* @inheritdoc
*/
public function tell()
{
$result = ftell($this->resource);
if ($result === false) {
throw new \RuntimeException('Could not get the position of the pointer in stream');
}
return $result;
}
/**
* @inheritdoc
*/
public function eof()
{
return isset($this->resource) && feof($this->resource);
}
/**
* @inheritdoc
*/
public function isSeekable()
{
return isset($this->resource) && $this->getMetadata('seekable');
}
/**
* @inheritdoc
*/
public function seek($offset, $whence = SEEK_SET)
{
if (!$this->isSeekable() || fseek($this->resource, $offset, $whence) === -1) {
throw new \RuntimeException('Could not seek in stream');
}
}
/**
* @inheritdoc
*/
public function rewind()
{
if (!$this->isSeekable() || rewind($this->resource) === false) {
throw new \RuntimeException('Could not rewind stream');
}
}
/**
* @inheritdoc
*/
public function isWritable()
{
return isset($this->resource) &&
in_array(rtrim($this->getMetadata('mode'), 'bt'), static::$modes['writable']);
}
/**
* @inheritdoc
*/
public function write($string)
{
if (!$this->isWritable() || ($result = fwrite($this->resource, $string)) === false) {
throw new \RuntimeException('Could not write to stream');
}
return $result;
}
/**
* @inheritdoc
*/
public function isReadable()
{
return isset($this->resource) &&
in_array(rtrim($this->getMetadata('mode'), 'bt'), static::$modes['readable']);
}
/**
* @inheritdoc
*/
public function read($length)
{
if (!$this->isReadable() || ($result = fread($this->resource, $length)) === false) {
throw new \RuntimeException('Could not read from stream');
}
return $result;
}
/**
* @inheritdoc
*/
public function getContents()
{
if (!$this->isReadable() || ($contents = stream_get_contents($this->resource)) === false) {
throw new \RuntimeException('Could not get contents of stream');
}
return $contents;
}
/**
* @inheritdoc
*/
public function getMetadata($key = null)
{
if ($key === null) {
return $this->metadata;
}
return isset($this->metadata[$key]) ? $this->metadata[$key] : null;
}
}