Streaming body parser: Multipart

composer.json

@@ -9,7 +9,8 @@
         "react/socket": "^1.0 || ^0.8 || ^0.7 || ^0.6 || ^0.5",
         "react/stream": "^1.0 || ^0.7 || ^0.6 || ^0.5 || ^0.4.6",
         "react/promise": "^2.1 || ^1.2.1",
-        "evenement/evenement": "^2.0 || ^1.0"
+        "evenement/evenement": "^2.0 || ^1.0",
+        "react/promise-stream": "^0.1"
     },
     "autoload": {
         "psr-4": {
@@ -18,7 +19,6 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8.10||^5.0",
-        "react/promise-stream": "^0.1.1",
         "react/socket": "^1.0 || ^0.8 || ^0.7",
         "clue/block-react": "^1.1"
     }

src/StreamingBodyParser/MultipartParser.php

@@ -0,0 +1,307 @@
+<?php
+
+namespace React\Http\StreamingBodyParser;
+
+use Evenement\EventEmitter;
+use Psr\Http\Message\RequestInterface;
+use React\Http\HttpBodyStream;
+use React\Http\UploadedFile;
+use React\Stream\ThroughStream;
+
+final class MultipartParser extends EventEmitter
+{
+    /**
+     * @var string
+     */
+    protected $buffer = '';
+
+    /**
+     * @var string
+     */
+    protected $ending = '';
+
+    /**
+     * @var int
+     */
+    protected $endingSize = 0;
+
+    /**
+     * @var string
+     */
+    protected $boundary;
+
+    /**
+     * @var RequestInterface
+     */
+    protected $request;
+
+    /**
+     * @var HttpBodyStream
+     */
+    protected $body;
+
+    /**
+     * @var callable
+     */
+    protected $onDataCallable;
+
+    public function __construct(RequestInterface $request)
+    {
+        $this->onDataCallable = array($this, 'onData');
+        $this->request = $request;
+        $this->body = $this->request->getBody();
+        $dataMethod = $this->determineOnDataMethod();
+        $this->setOnDataListener(array($this, $dataMethod));
+    }
+
+    protected function determineOnDataMethod()
+    {
+        if (!$this->request->hasHeader('content-type')) {
+            return 'findBoundary';
+        }
+
+        $contentType = $this->request->getHeaderLine('content-type');
+        preg_match('/boundary="?(.*)"?$/', $contentType, $matches);
+        if (isset($matches[1])) {
+            $this->setBoundary($matches[1]);
+            return 'onData';
+        }
+
+        return 'findBoundary';
+    }
+
+    protected function setBoundary($boundary)
+    {
+        $this->boundary = $boundary;
+        $this->ending = $this->boundary . "--\r\n";
+        $this->endingSize = strlen($this->ending);
+    }
+
+    public function findBoundary($data)
+    {
+        $this->buffer .= $data;
+
+        if (substr($this->buffer, 0, 3) === '---' && strpos($this->buffer, "\r\n") !== false) {
+            $boundary = substr($this->buffer, 2, strpos($this->buffer, "\r\n"));
+            $boundary = substr($boundary, 0, -2);
+            $this->setBoundary($boundary);
+            $this->setOnDataListener(array($this, 'onData'));
+        }
+    }
+
+    public function onData($data)
+    {
+        $this->buffer .= $data;
+        $ending = strpos($this->buffer, $this->ending) == strlen($this->buffer) - $this->endingSize;
+
+        if (
+            strrpos($this->buffer, $this->boundary) < strrpos($this->buffer, "\r\n\r\n") || $ending
+        ) {
+            $this->parseBuffer();
+        }
+
+        if ($ending) {
+            $this->emit('end');
+        }
+    }
+
+    protected function parseBuffer()
+    {
+        $chunks = preg_split('/-+' . $this->boundary . '/', $this->buffer);
+        $this->buffer = array_pop($chunks);
+        foreach ($chunks as $chunk) {
+            $chunk = $this->stripTrailingEOL($chunk);
+            $this->parseChunk($chunk);
+        }
+
+        $split = explode("\r\n\r\n", $this->buffer, 2);
+        if (count($split) <= 1) {
+            return;
+        }
+
+        $chunks = preg_split('/-+' . $this->boundary . '/', $split[0], -1, PREG_SPLIT_NO_EMPTY);
+        $headers = $this->parseHeaders(trim($chunks[0]));
+        if (isset($headers['content-disposition']) && $this->headerStartsWith($headers['content-disposition'], 'filename')) {
+            $this->parseFile($headers, $split[1]);
+            $this->buffer = '';
+        }
+    }
+
+    protected function parseChunk($chunk)
+    {
+        if ($chunk === '') {
+            return;
+        }
+
+        list ($header, $body) = explode("\r\n\r\n", $chunk, 2);
+        $headers = $this->parseHeaders($header);
+
+        if (!isset($headers['content-disposition'])) {
+            return;
+        }
+
+        if ($this->headerStartsWith($headers['content-disposition'], 'filename')) {
+            $this->parseFile($headers, $body, false);
+            return;
+        }
+
+        if ($this->headerStartsWith($headers['content-disposition'], 'name')) {
+            $this->parsePost($headers, $body);
+            return;
+        }
+    }
+
+    protected function parseFile($headers, $body, $streaming = true)
+    {
+        if (
+            !$this->headerContains($headers['content-disposition'], 'name=') ||
+            !$this->headerContains($headers['content-disposition'], 'filename=')
+        ) {
+            return;
+        }
+
+        $stream = new ThroughStream();
+        $this->emit('file', array(
+            $this->getFieldFromHeader($headers['content-disposition'], 'name'),
+            new UploadedFile(
+                new HttpBodyStream($stream, null),
+                0,
+                UPLOAD_ERR_OK,
+                $this->getFieldFromHeader($headers['content-disposition'], 'filename'),
+                $headers['content-type'][0]
+            ),
+            $headers,
+        ));
+
+        if (!$streaming) {
+            $stream->end($body);
+            return;
+        }
+
+        $this->setOnDataListener($this->chunkStreamFunc($stream));
+        $stream->write($body);
+    }
+
+    protected function chunkStreamFunc(ThroughStream $stream)
+    {
+        $that = $this;
+        $boundary = $this->boundary;
+        $buffer = '';
+        $func = function($data) use (&$buffer, $stream, $that, $boundary) {
+            $buffer .= $data;
+            if (strpos($buffer, $boundary) !== false) {
+                $chunks = preg_split('/-+' . $boundary . '/', $buffer);
+                $chunk = array_shift($chunks);
+                $chunk = $that->stripTrailingEOL($chunk);
+                $stream->end($chunk);
+
+                $that->setOnDataListener(array($that, 'onData'));
+
+                if (count($chunks) == 1) {
+                    array_unshift($chunks, '');
+                }
+
+                $that->onData(implode('-' . $boundary, $chunks));
+                return;
+            }
+
+            if (strlen($buffer) >= strlen($boundary) * 3) {
+                $stream->write($buffer);
+                $buffer = '';
+            }
+        };
+        return $func;
+    }
+
+    protected function parsePost($headers, $body)
+    {
+        foreach ($headers['content-disposition'] as $part) {
+            if (strpos($part, 'name') === 0) {
+                preg_match('/name="?(.*)"$/', $part, $matches);
+                $this->emit('post', array(
+                    $matches[1],
+                    $body,
+                    $headers,
+                ));
+            }
+        }
+    }
+
+    protected function parseHeaders($header)
+    {
+        $headers = array();
+
+        foreach (explode("\r\n", trim($header)) as $line) {
+            list($key, $values) = explode(':', $line, 2);
+            $key = trim($key);
+            $key = strtolower($key);
+            $values = explode(';', $values);
+            $values = array_map('trim', $values);
+            $headers[$key] = $values;
+        }
+
+        return $headers;
+    }
+
+    protected function headerStartsWith(array $header, $needle)
+    {
+        foreach ($header as $part) {
+            if (strpos($part, $needle) === 0) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    protected function headerContains(array $header, $needle)
+    {
+        foreach ($header as $part) {
+            if (strpos($part, $needle) !== false) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    protected function getFieldFromHeader(array $header, $field)
+    {
+        foreach ($header as $part) {
+            if (strpos($part, $field) === 0) {
+                preg_match('/' . $field . '="?(.*)"$/', $part, $matches);
+                return $matches[1];
+            }
+        }
+
+        return '';
+    }
+
+    /**
+     * @internal
+     */
+    public function setOnDataListener($callable)
+    {
+        $this->body->removeListener('data', $this->onDataCallable);
+        $this->onDataCallable = $callable;
+        $this->body->on('data', $this->onDataCallable);
+    }
+
+    public function cancel()
+    {
+        $this->body->removeListener('data', $this->onDataCallable);
+        $this->body->close();
+    }
+
+    /**
+     * @internal
+     */
+    public function stripTrailingEOL($chunk)
+    {
+        if (substr($chunk, -2) === "\r\n") {
+            return substr($chunk, 0, -2);
+        }
+
+        return $chunk;
+    }
+}