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SerializableResponseStream.php
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SerializableResponseStream.php
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<?php
/*
* Copyright 2007-2015 Abstrium <contact (at) pydio.com>
* This file is part of Pydio.
*
* Pydio is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <http://pyd.io/>.
*/
namespace Pydio\Core\Http\Response;
use Psr\Http\Message\StreamInterface;
use Pydio\Core\Controller\XMLWriter;
use Pydio\Core\Http\Message\UserMessage;
defined('AJXP_EXEC') or die('Access not allowed');
class SerializableResponseStream implements StreamInterface
{
const SERIALIZER_TYPE_XML = 'xml';
const SERIALIZER_TYPE_JSON = 'json';
protected $serializer = self::SERIALIZER_TYPE_XML;
/**
* @var SerializableResponseChunk[]
*/
protected $data = [];
/**
* @var string SerializedContent
*/
protected $serializedContent;
private $streamStatus = 'open';
/**
* @param string $serializer SERIALIZER_TYPE_XML|SERIALIZER_TYPE_JSON
*/
public function setSerializer($serializer){
$this->serializer = $serializer;
}
/**
* @param SerializableResponseChunk $chunk
*/
public function addChunk($chunk){
array_push($this->data, $chunk);
}
/**
* @return SerializableResponseChunk[]
*/
public function getChunks(){
return $this->data;
}
/**
* @return string
*/
public function getContents()
{
if(isSet($this->serializedContent)){
return $this->serializedContent;
}
return $this->serializeData($this->data, $this->serializer);
}
/**
* @param SerializableResponseChunk[] $data
* @param string $serializer
* @return string
* @throws \RuntimeException
*/
protected function serializeData($data, $serializer){
if($serializer == self::SERIALIZER_TYPE_JSON){
$buffer = [];
foreach ($data as $serializableItem){
if($serializableItem instanceof JSONSerializableResponseChunk){
$key = $serializableItem->jsonSerializableKey();
if($key != null){
$buffer[$key] = $serializableItem->jsonSerializableData();
}else{
$buffer[] = $serializableItem->jsonSerializableData();
}
}else{
$buffer[] = $serializableItem;
}
}
if(count($buffer) == 1) {
$json = json_encode(array_shift($buffer));
}else {
$json = json_encode($buffer);
}
if($json === null){
$msg = json_last_error_msg();
$error = json_last_error();
$message = new UserMessage($msg. " ($error)", LOG_LEVEL_ERROR);
return json_encode($message->jsonSerializableData());
}else{
return $json;
}
}else if($serializer == self::SERIALIZER_TYPE_XML){
$wrap = true;
$buffer = "";
$charset = null;
foreach ($data as $serializableItem){
if(!$serializableItem instanceof XMLSerializableResponseChunk){
continue;
}
$buffer .= $serializableItem->toXML();
if($serializableItem instanceof XMLDocSerializableResponseChunk){
$wrap = false;
$charset = $serializableItem->getCharset();
}
}
if($wrap){
return XMLWriter::wrapDocument($buffer);
}else{
return "<?xml version=\"1.0\" encoding=\"".$charset."\"?>".$buffer;
}
}
return "";
}
/**
* 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()
{
return $this->getContents();
}
/**
* Closes the stream and any underlying resources.
*
* @return void
*/
public function close()
{
$this->streamStatus = 'closed';
}
/**
* Separates any underlying resources from the stream.
*
* After the stream has been detached, the stream is in an unusable state.
*
* @return resource|null Underlying PHP stream, if any
*/
public function detach()
{
return null;
}
/**
* Get the size of the stream if known.
*
* @return int|null Returns the size in bytes if known, or null if unknown.
*/
public function getSize()
{
if(!empty($this->data)){
$this->serializedContent = $this->getContents();
return strlen($this->serializedContent);
}else{
return 0;
}
}
/**
* Returns the current position of the file read/write pointer
*
* @return int Position of the file pointer
* @throws \RuntimeException on error.
*/
public function tell()
{
return -1;
}
/**
* Returns true if the stream is at the end of the stream.
*
* @return bool
*/
public function eof()
{
return false;
}
/**
* Returns whether or not the stream is seekable.
*
* @return bool
*/
public function isSeekable()
{
return false;
}
/**
* 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 $whence values for `fseek()`. SEEK_SET: Set position equal to
* offset bytes SEEK_CUR: Set position to current location plus offset
* SEEK_END: Set position to end-of-stream plus offset.
* @throws \RuntimeException on failure.
*/
public function seek($offset, $whence = SEEK_SET){}
/**
* 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(){}
/**
* Returns whether or not the stream is writable.
*
* @return bool
*/
public function isWritable(){
return true;
}
/**
* Write data to the stream.
*
* @param string $string The string that is to be written.
* @return int Returns the number of bytes written to the stream.
* @throws \RuntimeException on failure.
*/
public function write($string){
return strlen($string);
}
/**
* Returns whether or not the stream is readable.
*
* @return bool
*/
public function isReadable(){
return true;
}
/**
* 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){
return '';
}
/**
* 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){
return null;
}
}