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<?php
/**
* Slim Framework (https://slimframework.com)
*
* @license https://github.com/slimphp/Slim/blob/3.x/LICENSE.md (MIT License)
*/
namespace Slim\Http;
use InvalidArgumentException;
use Psr\Http\Message\StreamInterface;
use RuntimeException;
/**
* Represents a data stream as defined in PSR-7.
*
* @link https://github.com/php-fig/http-message/blob/master/src/StreamInterface.php
*/
class Stream implements StreamInterface
{
/**
* Bit mask to determine if the stream is a pipe
*
* This is octal as per header stat.h
*/
const FSTAT_MODE_S_IFIFO = 0010000;
/**
* Resource modes
*
* @var array
* @link http://php.net/manual/function.fopen.php
*/
protected static $modes = [
'readable' => ['r', 'r+', 'w+', 'a+', 'x+', 'c+'],
'writable' => ['r+', 'w', 'w+', 'a', 'a+', 'x', 'x+', 'c', 'c+'],
];
/**
* The underlying stream resource
*
* @var resource
*/
protected $stream;
/**
* Stream metadata
*
* @var array
*/
protected $meta;
/**
* Is this stream readable?
*
* @var bool
*/
protected $readable;
/**
* Is this stream writable?
*
* @var bool
*/
protected $writable;
/**
* Is this stream seekable?
*
* @var bool
*/
protected $seekable;
/**
* The size of the stream if known
*
* @var null|int
*/
protected $size;
/**
* Is this stream a pipe?
*
* @var bool
*/
protected $isPipe;
/**
* @param resource $stream A PHP resource handle.
*
* @throws InvalidArgumentException If argument is not a resource.
*/
public function __construct($stream)
{
$this->attach($stream);
}
/**
* Get stream metadata as an associative array or retrieve a specific key.
*
* The keys returned are identical to the keys returned from PHP's stream_get_meta_data() function.
*
* @link http://php.net/manual/en/function.stream-get-meta-data.php
*
* @param string $key Specific metadata to retrieve.
*
* @return array|mixed|null Returns an associative array if no key is
* provided. Returns a specific key value if a key is provided and the
* value is found, or null if the key is not found.
*/
public function getMetadata($key = null)
{
$this->meta = stream_get_meta_data($this->stream);
if (is_null($key) === true) {
return $this->meta;
}
return isset($this->meta[$key]) ? $this->meta[$key] : null;
}
/**
* Is a resource attached to this stream?
*
* Note: This method is not part of the PSR-7 standard.
*
* @return bool
*/
protected function isAttached()
{
return is_resource($this->stream);
}
/**
* Attach new resource to this object.
*
* Note: This method is not part of the PSR-7 standard.
*
* @param resource $newStream A PHP resource handle.
*
* @throws InvalidArgumentException If argument is not a valid PHP resource.
*/
protected function attach($newStream)
{
if (is_resource($newStream) === false) {
throw new InvalidArgumentException(__METHOD__ . ' argument must be a valid PHP resource');
}
if ($this->isAttached() === true) {
$this->detach();
}
$this->stream = $newStream;
}
/**
* Separates any underlying resources from the stream.
*
* After the stream has been detached, the stream is in an unusable state.
*
* @return resource|null Underlying PHP stream, if any
*/
public function detach()
{
$oldResource = $this->stream;
$this->stream = null;
$this->meta = null;
$this->readable = null;
$this->writable = null;
$this->seekable = null;
$this->size = null;
$this->isPipe = null;
return $oldResource;
}
/**
* Reads all data from the stream into a string, from the beginning to end.
*
* This method MUST attempt to seek to the beginning of the stream before
* reading data and read the stream until the end is reached.
*
* Warning: This could attempt to load a large amount of data into memory.
*
* This method MUST NOT raise an exception in order to conform with PHP's
* string casting operations.
*
* @see http://php.net/manual/en/language.oop5.magic.php#object.tostring
*
* @return string
*/
public function __toString()
{
if (!$this->isAttached()) {
return '';
}
try {
$this->rewind();
return $this->getContents();
} catch (RuntimeException $e) {
return '';
}
}
/**
* Closes the stream and any underlying resources.
*/
public function close()
{
if ($this->isAttached() === true) {
if ($this->isPipe()) {
pclose($this->stream);
} else {
fclose($this->stream);
}
}
$this->detach();
}
/**
* Get the size of the stream if known.
*
* @return int|null Returns the size in bytes if known, or null if unknown.
*/
public function getSize()
{
if (!$this->size && $this->isAttached() === true) {
$stats = fstat($this->stream);
$this->size = isset($stats['size']) && !$this->isPipe() ? $stats['size'] : null;
}
return $this->size;
}
/**
* Returns the current position of the file read/write pointer
*
* @return int Position of the file pointer
*
* @throws RuntimeException on error.
*/
public function tell()
{
if (!$this->isAttached() || ($position = ftell($this->stream)) === false || $this->isPipe()) {
throw new RuntimeException('Could not get the position of the pointer in stream');
}
return $position;
}
/**
* Returns true if the stream is at the end of the stream.
*
* @return bool
*/
public function eof()
{
return $this->isAttached() ? feof($this->stream) : true;
}
/**
* Returns whether or not the stream is readable.
*
* @return bool
*/
public function isReadable()
{
if ($this->readable === null) {
if ($this->isPipe()) {
$this->readable = true;
} else {
$this->readable = false;
if ($this->isAttached()) {
$meta = $this->getMetadata();
foreach (self::$modes['readable'] as $mode) {
if (strpos($meta['mode'], $mode) === 0) {
$this->readable = true;
break;
}
}
}
}
}
return $this->readable;
}
/**
* Returns whether or not the stream is writable.
*
* @return bool
*/
public function isWritable()
{
if ($this->writable === null) {
$this->writable = false;
if ($this->isAttached()) {
$meta = $this->getMetadata();
foreach (self::$modes['writable'] as $mode) {
if (strpos($meta['mode'], $mode) === 0) {
$this->writable = true;
break;
}
}
}
}
return $this->writable;
}
/**
* Returns whether or not the stream is seekable.
*
* @return bool
*/
public function isSeekable()
{
if ($this->seekable === null) {
$this->seekable = false;
if ($this->isAttached()) {
$meta = $this->getMetadata();
$this->seekable = !$this->isPipe() && $meta['seekable'];
}
}
return $this->seekable;
}
/**
* Seek to a position in the stream.
*
* @link http://www.php.net/manual/en/function.fseek.php
*
* @param int $offset Stream offset
* @param int $whence Specifies how the cursor position will be calculated
* based on the seek offset. Valid values are identical to the built-in
* PHP $whence values for `fseek()`. SEEK_SET: Set position equal to
* offset bytes SEEK_CUR: Set position to current location plus offset
* SEEK_END: Set position to end-of-stream plus offset.
*
* @throws RuntimeException If stream is not seekable
*/
public function seek($offset, $whence = SEEK_SET)
{
// Note that fseek returns 0 on success!
if (!$this->isSeekable() || fseek($this->stream, $offset, $whence) === -1) {
throw new RuntimeException('Could not seek in stream');
}
}
/**
* Seek to the beginning of the stream.
*
* If the stream is not seekable, this method will raise an exception;
* otherwise, it will perform a seek(0).
*
* @see seek()
*
* @link http://www.php.net/manual/en/function.fseek.php
*
* @throws RuntimeException on failure.
*/
public function rewind()
{
if (!$this->isSeekable() || rewind($this->stream) === false) {
throw new RuntimeException('Could not rewind stream');
}
}
/**
* Read data from the stream.
*
* @param int $length Read up to $length bytes from the object and return
* them. Fewer than $length bytes may be returned if underlying stream
* call returns fewer bytes.
*
* @return string Returns the data read from the stream, or an empty string if no bytes are available.
*
* @throws RuntimeException if an error occurs.
*/
public function read($length)
{
if (!$this->isReadable() || ($data = fread($this->stream, $length)) === false) {
throw new RuntimeException('Could not read from stream');
}
return $data;
}
/**
* Write data to the stream.
*
* @param string $string The string that is to be written.
*
* @return int Returns the number of bytes written to the stream.
*
* @throws RuntimeException If stream is not writable
*/
public function write($string)
{
if (!$this->isWritable() || ($written = fwrite($this->stream, $string)) === false) {
throw new RuntimeException('Could not write to stream');
}
// reset size so that it will be recalculated on next call to getSize()
$this->size = null;
return $written;
}
/**
* Returns the remaining contents in a string
*
* @return string
*
* @throws RuntimeException If stream is not readable
*/
public function getContents()
{
if (!$this->isReadable() || ($contents = stream_get_contents($this->stream)) === false) {
throw new RuntimeException('Could not get contents of stream');
}
return $contents;
}
/**
* Returns whether or not the stream is a pipe.
*
* @return bool
*/
public function isPipe()
{
if ($this->isPipe === null) {
$this->isPipe = false;
if ($this->isAttached()) {
$mode = fstat($this->stream)['mode'];
$this->isPipe = ($mode & self::FSTAT_MODE_S_IFIFO) !== 0;
}
}
return $this->isPipe;
}
}