runff 1.0 commit

lib/aws/Aws/Api/Parser/AbstractParser.php

@@ -0,0 +1,46 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\Service;
+use Aws\Api\StructureShape;
+use Aws\CommandInterface;
+use Aws\ResultInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * @internal
+ */
+abstract class AbstractParser
+{
+    /** @var \Aws\Api\Service Representation of the service API*/
+    protected $api;
+
+    /** @var callable */
+    protected $parser;
+
+    /**
+     * @param Service $api Service description.
+     */
+    public function __construct(Service $api)
+    {
+        $this->api = $api;
+    }
+
+    /**
+     * @param CommandInterface  $command  Command that was executed.
+     * @param ResponseInterface $response Response that was received.
+     *
+     * @return ResultInterface
+     */
+    abstract public function __invoke(
+        CommandInterface $command,
+        ResponseInterface $response
+    );
+
+    abstract public function parseMemberFromStream(
+        StreamInterface $stream,
+        StructureShape $member,
+        $response
+    );
+}

lib/aws/Aws/Api/Parser/AbstractRestParser.php

@@ -0,0 +1,173 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\DateTimeResult;
+use Aws\Api\Shape;
+use Aws\Api\StructureShape;
+use Aws\Result;
+use Aws\CommandInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * @internal
+ */
+abstract class AbstractRestParser extends AbstractParser
+{
+    use PayloadParserTrait;
+    /**
+     * Parses a payload from a response.
+     *
+     * @param ResponseInterface $response Response to parse.
+     * @param StructureShape    $member   Member to parse
+     * @param array             $result   Result value
+     *
+     * @return mixed
+     */
+    abstract protected function payload(
+        ResponseInterface $response,
+        StructureShape $member,
+        array &$result
+    );
+
+    public function __invoke(
+        CommandInterface $command,
+        ResponseInterface $response
+    ) {
+        $output = $this->api->getOperation($command->getName())->getOutput();
+        $result = [];
+
+        if ($payload = $output['payload']) {
+            $this->extractPayload($payload, $output, $response, $result);
+        }
+
+        foreach ($output->getMembers() as $name => $member) {
+            switch ($member['location']) {
+                case 'header':
+                    $this->extractHeader($name, $member, $response, $result);
+                    break;
+                case 'headers':
+                    $this->extractHeaders($name, $member, $response, $result);
+                    break;
+                case 'statusCode':
+                    $this->extractStatus($name, $response, $result);
+                    break;
+            }
+        }
+
+        if (!$payload
+            && $response->getBody()->getSize() > 0
+            && count($output->getMembers()) > 0
+        ) {
+            // if no payload was found, then parse the contents of the body
+            $this->payload($response, $output, $result);
+        }
+
+        return new Result($result);
+    }
+
+    private function extractPayload(
+        $payload,
+        StructureShape $output,
+        ResponseInterface $response,
+        array &$result
+    ) {
+        $member = $output->getMember($payload);
+
+        if (!empty($member['eventstream'])) {
+            $result[$payload] = new EventParsingIterator(
+                $response->getBody(),
+                $member,
+                $this
+            );
+        } else if ($member instanceof StructureShape) {
+            // Structure members parse top-level data into a specific key.
+            $result[$payload] = [];
+            $this->payload($response, $member, $result[$payload]);
+        } else {
+            // Streaming data is just the stream from the response body.
+            $result[$payload] = $response->getBody();
+        }
+    }
+
+    /**
+     * Extract a single header from the response into the result.
+     */
+    private function extractHeader(
+        $name,
+        Shape $shape,
+        ResponseInterface $response,
+        &$result
+    ) {
+        $value = $response->getHeaderLine($shape['locationName'] ?: $name);
+
+        switch ($shape->getType()) {
+            case 'float':
+            case 'double':
+                $value = (float) $value;
+                break;
+            case 'long':
+                $value = (int) $value;
+                break;
+            case 'boolean':
+                $value = filter_var($value, FILTER_VALIDATE_BOOLEAN);
+                break;
+            case 'blob':
+                $value = base64_decode($value);
+                break;
+            case 'timestamp':
+                try {
+                    if (!empty($shape['timestampFormat'])
+                        && $shape['timestampFormat'] === 'unixTimestamp') {
+                        $value = DateTimeResult::fromEpoch($value);
+                    }
+                    $value = new DateTimeResult($value);
+                    break;
+                } catch (\Exception $e) {
+                    // If the value cannot be parsed, then do not add it to the
+                    // output structure.
+                    return;
+                }
+            case 'string':
+                if ($shape['jsonvalue']) {
+                    $value = $this->parseJson(base64_decode($value), $response);
+                }
+                break;
+        }
+
+        $result[$name] = $value;
+    }
+
+    /**
+     * Extract a map of headers with an optional prefix from the response.
+     */
+    private function extractHeaders(
+        $name,
+        Shape $shape,
+        ResponseInterface $response,
+        &$result
+    ) {
+        // Check if the headers are prefixed by a location name
+        $result[$name] = [];
+        $prefix = $shape['locationName'];
+        $prefixLen = strlen($prefix);
+
+        foreach ($response->getHeaders() as $k => $values) {
+            if (!$prefixLen) {
+                $result[$name][$k] = implode(', ', $values);
+            } elseif (stripos($k, $prefix) === 0) {
+                $result[$name][substr($k, $prefixLen)] = implode(', ', $values);
+            }
+        }
+    }
+
+    /**
+     * Places the status code of the response into the result array.
+     */
+    private function extractStatus(
+        $name,
+        ResponseInterface $response,
+        array &$result
+    ) {
+        $result[$name] = (int) $response->getStatusCode();
+    }
+}

lib/aws/Aws/Api/Parser/Crc32ValidatingParser.php

@@ -0,0 +1,54 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\StructureShape;
+use Aws\CommandInterface;
+use Aws\Exception\AwsException;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+use GuzzleHttp\Psr7;
+
+/**
+ * @internal Decorates a parser and validates the x-amz-crc32 header.
+ */
+class Crc32ValidatingParser extends AbstractParser
+{
+    /**
+     * @param callable $parser Parser to wrap.
+     */
+    public function __construct(callable $parser)
+    {
+        $this->parser = $parser;
+    }
+
+    public function __invoke(
+        CommandInterface $command,
+        ResponseInterface $response
+    ) {
+        if ($expected = $response->getHeaderLine('x-amz-crc32')) {
+            $hash = hexdec(Psr7\hash($response->getBody(), 'crc32b'));
+            if ($expected != $hash) {
+                throw new AwsException(
+                    "crc32 mismatch. Expected {$expected}, found {$hash}.",
+                    $command,
+                    [
+                        'code'             => 'ClientChecksumMismatch',
+                        'connection_error' => true,
+                        'response'         => $response
+                    ]
+                );
+            }
+        }
+
+        $fn = $this->parser;
+        return $fn($command, $response);
+    }
+
+    public function parseMemberFromStream(
+        StreamInterface $stream,
+        StructureShape $member,
+        $response
+    ) {
+        return $this->parser->parseMemberFromStream($stream, $member, $response);
+    }
+}

lib/aws/Aws/Api/Parser/DecodingEventStreamIterator.php

@@ -0,0 +1,335 @@
+<?php
+
+namespace Aws\Api\Parser;
+
+use \Iterator;
+use Aws\Api\DateTimeResult;
+use GuzzleHttp\Psr7;
+use Psr\Http\Message\StreamInterface;
+use Aws\Api\Parser\Exception\ParserException;
+
+/**
+ * @internal Implements a decoder for a binary encoded event stream that will
+ * decode, validate, and provide individual events from the stream.
+ */
+class DecodingEventStreamIterator implements Iterator
+{
+    const HEADERS = 'headers';
+    const PAYLOAD = 'payload';
+
+    const LENGTH_TOTAL = 'total_length';
+    const LENGTH_HEADERS = 'headers_length';
+
+    const CRC_PRELUDE = 'prelude_crc';
+
+    const BYTES_PRELUDE = 12;
+    const BYTES_TRAILING = 4;
+
+    private static $preludeFormat = [
+        self::LENGTH_TOTAL => 'decodeUint32',
+        self::LENGTH_HEADERS => 'decodeUint32',
+        self::CRC_PRELUDE => 'decodeUint32',
+    ];
+
+    private static $lengthFormatMap = [
+        1 => 'decodeUint8',
+        2 => 'decodeUint16',
+        4 => 'decodeUint32',
+        8 => 'decodeUint64',
+    ];
+
+    private static $headerTypeMap = [
+        0 => 'decodeBooleanTrue',
+        1 => 'decodeBooleanFalse',
+        2 => 'decodeInt8',
+        3 => 'decodeInt16',
+        4 => 'decodeInt32',
+        5 => 'decodeInt64',
+        6 => 'decodeBytes',
+        7 => 'decodeString',
+        8 => 'decodeTimestamp',
+        9 => 'decodeUuid',
+    ];
+
+    /** @var StreamInterface Stream of eventstream shape to parse. */
+    private $stream;
+
+    /** @var array Currently parsed event. */
+    private $currentEvent;
+
+    /** @var int Current in-order event key. */
+    private $key;
+
+    /** @var resource|HashContext CRC32 hash context for event validation */
+    private $hashContext;
+
+    /** @var int $currentPosition */
+    private $currentPosition;
+
+    /**
+     * DecodingEventStreamIterator constructor.
+     *
+     * @param StreamInterface $stream
+     */
+    public function __construct(StreamInterface $stream)
+    {
+        $this->stream = $stream;
+        $this->rewind();
+    }
+
+    private function parseHeaders($headerBytes)
+    {
+        $headers = [];
+        $bytesRead = 0;
+
+        while ($bytesRead < $headerBytes) {
+            list($key, $numBytes) = $this->decodeString(1);
+            $bytesRead += $numBytes;
+
+            list($type, $numBytes) = $this->decodeUint8();
+            $bytesRead += $numBytes;
+
+            $f = self::$headerTypeMap[$type];
+            list($value, $numBytes) = $this->{$f}();
+            $bytesRead += $numBytes;
+
+            if (isset($headers[$key])) {
+                throw new ParserException('Duplicate key in event headers.');
+            }
+            $headers[$key] = $value;
+        }
+
+        return [$headers, $bytesRead];
+    }
+
+    private function parsePrelude()
+    {
+        $prelude = [];
+        $bytesRead = 0;
+
+        $calculatedCrc = null;
+        foreach (self::$preludeFormat as $key => $decodeFunction) {
+            if ($key === self::CRC_PRELUDE) {
+                $hashCopy = hash_copy($this->hashContext);
+                $calculatedCrc = hash_final($this->hashContext, true);
+                $this->hashContext = $hashCopy;
+            }
+            list($value, $numBytes) = $this->{$decodeFunction}();
+            $bytesRead += $numBytes;
+
+            $prelude[$key] = $value;
+        }
+
+        if (unpack('N', $calculatedCrc)[1] !== $prelude[self::CRC_PRELUDE]) {
+            throw new ParserException('Prelude checksum mismatch.');
+        }
+
+        return [$prelude, $bytesRead];
+    }
+
+    private function parseEvent()
+    {
+        $event = [];
+
+        if ($this->stream->tell() < $this->stream->getSize()) {
+            $this->hashContext = hash_init('crc32b');
+
+            $bytesLeft = $this->stream->getSize() - $this->stream->tell();
+            list($prelude, $numBytes) = $this->parsePrelude();
+            if ($prelude[self::LENGTH_TOTAL] > $bytesLeft) {
+                throw new ParserException('Message length too long.');
+            }
+            $bytesLeft -= $numBytes;
+
+            if ($prelude[self::LENGTH_HEADERS] > $bytesLeft) {
+                throw new ParserException('Headers length too long.');
+            }
+
+            list(
+                $event[self::HEADERS],
+                $numBytes
+            ) = $this->parseHeaders($prelude[self::LENGTH_HEADERS]);
+
+            $event[self::PAYLOAD] = Psr7\stream_for(
+                $this->readAndHashBytes(
+                    $prelude[self::LENGTH_TOTAL] - self::BYTES_PRELUDE
+                    - $numBytes - self::BYTES_TRAILING
+                )
+            );
+
+            $calculatedCrc = hash_final($this->hashContext, true);
+            $messageCrc = $this->stream->read(4);
+            if ($calculatedCrc !== $messageCrc) {
+                throw new ParserException('Message checksum mismatch.');
+            }
+        }
+
+        return $event;
+    }
+
+    // Iterator Functionality
+
+    /**
+     * @return array
+     */
+    public function current()
+    {
+        return $this->currentEvent;
+    }
+
+    /**
+     * @return int
+     */
+    public function key()
+    {
+        return $this->key;
+    }
+
+    public function next()
+    {
+        $this->currentPosition = $this->stream->tell();
+        if ($this->valid()) {
+            $this->key++;
+            $this->currentEvent = $this->parseEvent();
+        }
+    }
+
+    public function rewind()
+    {
+        $this->stream->rewind();
+        $this->key = 0;
+        $this->currentPosition = 0;
+        $this->currentEvent = $this->parseEvent();
+    }
+
+    /**
+     * @return bool
+     */
+    public function valid()
+    {
+        return $this->currentPosition < $this->stream->getSize();
+    }
+
+    // Decoding Utilities
+
+    private function readAndHashBytes($num)
+    {
+        $bytes = $this->stream->read($num);
+        hash_update($this->hashContext, $bytes);
+        return $bytes;
+    }
+
+    private function decodeBooleanTrue()
+    {
+        return [true, 0];
+    }
+
+    private function decodeBooleanFalse()
+    {
+        return [false, 0];
+    }
+
+    private function uintToInt($val, $size)
+    {
+        $signedCap = pow(2, $size - 1);
+        if ($val > $signedCap) {
+            $val -= (2 * $signedCap);
+        }
+        return $val;
+    }
+
+    private function decodeInt8()
+    {
+        $val = (int)unpack('C', $this->readAndHashBytes(1))[1];
+        return [$this->uintToInt($val, 8), 1];
+    }
+
+    private function decodeUint8()
+    {
+        return [unpack('C', $this->readAndHashBytes(1))[1], 1];
+    }
+
+    private function decodeInt16()
+    {
+        $val = (int)unpack('n', $this->readAndHashBytes(2))[1];
+        return [$this->uintToInt($val, 16), 2];
+    }
+
+    private function decodeUint16()
+    {
+        return [unpack('n', $this->readAndHashBytes(2))[1], 2];
+    }
+
+    private function decodeInt32()
+    {
+        $val = (int)unpack('N', $this->readAndHashBytes(4))[1];
+        return [$this->uintToInt($val, 32), 4];
+    }
+
+    private function decodeUint32()
+    {
+        return [unpack('N', $this->readAndHashBytes(4))[1], 4];
+    }
+
+    private function decodeInt64()
+    {
+        $val = $this->unpackInt64($this->readAndHashBytes(8))[1];
+        return [$this->uintToInt($val, 64), 8];
+    }
+
+    private function decodeUint64()
+    {
+        return [$this->unpackInt64($this->readAndHashBytes(8))[1], 8];
+    }
+
+    private function unpackInt64($bytes)
+    {
+        if (version_compare(PHP_VERSION, '5.6.3', '<')) {
+            $d = unpack('N2', $bytes);
+            return [1 => $d[1] << 32 | $d[2]];
+        }
+        return unpack('J', $bytes);
+    }
+
+    private function decodeBytes($lengthBytes=2)
+    {
+        if (!isset(self::$lengthFormatMap[$lengthBytes])) {
+            throw new ParserException('Undefined variable length format.');
+        }
+        $f = self::$lengthFormatMap[$lengthBytes];
+        list($len, $bytes) = $this->{$f}();
+        return [$this->readAndHashBytes($len), $len + $bytes];
+    }
+
+    private function decodeString($lengthBytes=2)
+    {
+        if (!isset(self::$lengthFormatMap[$lengthBytes])) {
+            throw new ParserException('Undefined variable length format.');
+        }
+        $f = self::$lengthFormatMap[$lengthBytes];
+        list($len, $bytes) = $this->{$f}();
+        return [$this->readAndHashBytes($len), $len + $bytes];
+    }
+
+    private function decodeTimestamp()
+    {
+        list($val, $bytes) = $this->decodeInt64();
+        return [
+            DateTimeResult::createFromFormat('U.u', $val / 1000),
+            $bytes
+        ];
+    }
+
+    private function decodeUuid()
+    {
+        $val = unpack('H32', $this->readAndHashBytes(16))[1];
+        return [
+            substr($val, 0, 8) . '-'
+            . substr($val, 8, 4) . '-'
+            . substr($val, 12, 4) . '-'
+            . substr($val, 16, 4) . '-'
+            . substr($val, 20, 12),
+            16
+        ];
+    }
+}

lib/aws/Aws/Api/Parser/EventParsingIterator.php

@@ -0,0 +1,107 @@
+<?php
+
+namespace Aws\Api\Parser;
+
+use \Iterator;
+use Aws\Exception\EventStreamDataException;
+use Aws\Api\Parser\Exception\ParserException;
+use Aws\Api\StructureShape;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * @internal Implements a decoder for a binary encoded event stream that will
+ * decode, validate, and provide individual events from the stream.
+ */
+class EventParsingIterator implements Iterator
+{
+    /** @var StreamInterface */
+    private $decodingIterator;
+
+    /** @var StructureShape */
+    private $shape;
+
+    /** @var AbstractParser */
+    private $parser;
+
+    public function __construct(
+        StreamInterface $stream,
+        StructureShape $shape,
+        AbstractParser $parser
+    ) {
+        $this->decodingIterator = new DecodingEventStreamIterator($stream);
+        $this->shape = $shape;
+        $this->parser = $parser;
+    }
+
+    public function current()
+    {
+        return $this->parseEvent($this->decodingIterator->current());
+    }
+
+    public function key()
+    {
+        return $this->decodingIterator->key();
+    }
+
+    public function next()
+    {
+        $this->decodingIterator->next();
+    }
+
+    public function rewind()
+    {
+        $this->decodingIterator->rewind();
+    }
+
+    public function valid()
+    {
+        return $this->decodingIterator->valid();
+    }
+
+    private function parseEvent(array $event)
+    {
+        if (!empty($event['headers'][':message-type'])) {
+            if ($event['headers'][':message-type'] === 'error') {
+                return $this->parseError($event);
+            }
+            if ($event['headers'][':message-type'] !== 'event') {
+                throw new ParserException('Failed to parse unknown message type.');
+            }
+        }
+
+        if (empty($event['headers'][':event-type'])) {
+            throw new ParserException('Failed to parse without event type.');
+        }
+        $eventShape = $this->shape->getMember($event['headers'][':event-type']);
+
+        $parsedEvent = [];
+        foreach ($eventShape['members'] as $shape => $details) {
+            if (!empty($details['eventpayload'])) {
+                $payloadShape = $eventShape->getMember($shape);
+                if ($payloadShape['type'] === 'blob') {
+                    $parsedEvent[$shape] = $event['payload'];
+                } else {
+                    $parsedEvent[$shape] = $this->parser->parseMemberFromStream(
+                        $event['payload'],
+                        $payloadShape,
+                        null
+                    );
+                }
+            } else {
+                $parsedEvent[$shape] = $event['headers'][$shape];
+            }
+        }
+
+        return [
+            $event['headers'][':event-type'] => $parsedEvent
+        ];
+    }
+
+    private function parseError(array $event)
+    {
+        throw new EventStreamDataException(
+            $event['headers'][':error-code'],
+            $event['headers'][':error-message']
+        );
+    }
+}

lib/aws/Aws/Api/Parser/Exception/ParserException.php

@@ -0,0 +1,31 @@
+<?php
+namespace Aws\Api\Parser\Exception;
+
+use Aws\HasMonitoringEventsTrait;
+use Aws\MonitoringEventsInterface;
+use Aws\ResponseContainerInterface;
+
+class ParserException extends \RuntimeException implements
+    MonitoringEventsInterface,
+    ResponseContainerInterface
+{
+    use HasMonitoringEventsTrait;
+
+    private $response;
+
+    public function __construct($message = '', $code = 0, $previous = null, array $context = [])
+    {
+        $this->response = isset($context['response']) ? $context['response'] : null;
+        parent::__construct($message, $code, $previous);
+    }
+
+    /**
+     * Get the received HTTP response if any.
+     *
+     * @return ResponseInterface|null
+     */
+    public function getResponse()
+    {
+        return $this->response;
+    }
+}

lib/aws/Aws/Api/Parser/JsonParser.php

@@ -0,0 +1,62 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\DateTimeResult;
+use Aws\Api\Shape;
+
+/**
+ * @internal Implements standard JSON parsing.
+ */
+class JsonParser
+{
+    public function parse(Shape $shape, $value)
+    {
+        if ($value === null) {
+            return $value;
+        }
+
+        switch ($shape['type']) {
+            case 'structure':
+                $target = [];
+                foreach ($shape->getMembers() as $name => $member) {
+                    $locationName = $member['locationName'] ?: $name;
+                    if (isset($value[$locationName])) {
+                        $target[$name] = $this->parse($member, $value[$locationName]);
+                    }
+                }
+                return $target;
+
+            case 'list':
+                $member = $shape->getMember();
+                $target = [];
+                foreach ($value as $v) {
+                    $target[] = $this->parse($member, $v);
+                }
+                return $target;
+
+            case 'map':
+                $values = $shape->getValue();
+                $target = [];
+                foreach ($value as $k => $v) {
+                    $target[$k] = $this->parse($values, $v);
+                }
+                return $target;
+
+            case 'timestamp':
+                if (!empty($shape['timestampFormat'])
+                    && $shape['timestampFormat'] !== 'unixTimestamp') {
+                    return new DateTimeResult($value);
+                }
+                // The Unix epoch (or Unix time or POSIX time or Unix
+                // timestamp) is the number of seconds that have elapsed since
+                // January 1, 1970 (midnight UTC/GMT).
+                return DateTimeResult::fromEpoch($value);
+
+            case 'blob':
+                return base64_decode($value);
+
+            default:
+                return $value;
+        }
+    }
+}

lib/aws/Aws/Api/Parser/JsonRpcParser.php

@@ -0,0 +1,51 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\StructureShape;
+use Aws\Api\Service;
+use Aws\Result;
+use Aws\CommandInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * @internal Implements JSON-RPC parsing (e.g., DynamoDB)
+ */
+class JsonRpcParser extends AbstractParser
+{
+    use PayloadParserTrait;
+
+    /**
+     * @param Service    $api    Service description
+     * @param JsonParser $parser JSON body builder
+     */
+    public function __construct(Service $api, JsonParser $parser = null)
+    {
+        parent::__construct($api);
+        $this->parser = $parser ?: new JsonParser();
+    }
+
+    public function __invoke(
+        CommandInterface $command,
+        ResponseInterface $response
+    ) {
+        $operation = $this->api->getOperation($command->getName());
+        $result = null === $operation['output']
+            ? null
+            : $this->parseMemberFromStream(
+                $response->getBody(),
+                $operation->getOutput(),
+                $response
+            );
+
+        return new Result($result ?: []);
+    }
+
+    public function parseMemberFromStream(
+        StreamInterface $stream,
+        StructureShape $member,
+        $response
+    ) {
+        return $this->parser->parse($member, $this->parseJson($stream, $response));
+    }
+}

lib/aws/Aws/Api/Parser/PayloadParserTrait.php

@@ -0,0 +1,61 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\Parser\Exception\ParserException;
+use Psr\Http\Message\ResponseInterface;
+
+trait PayloadParserTrait
+{
+    /**
+     * @param string $json
+     *
+     * @throws ParserException
+     *
+     * @return array
+     */
+    private function parseJson($json, $response)
+    {
+        $jsonPayload = json_decode($json, true);
+
+        if (JSON_ERROR_NONE !== json_last_error()) {
+            throw new ParserException(
+                'Error parsing JSON: ' . json_last_error_msg(),
+                0,
+                null,
+                ['response' => $response]
+            );
+        }
+
+        return $jsonPayload;
+    }
+
+    /**
+     * @param string $xml
+     *
+     * @throws ParserException
+     *
+     * @return \SimpleXMLElement
+     */
+    private function parseXml($xml, $response)
+    {
+        $priorSetting = libxml_use_internal_errors(true);
+        try {
+            libxml_clear_errors();
+            $xmlPayload = new \SimpleXMLElement($xml);
+            if ($error = libxml_get_last_error()) {
+                throw new \RuntimeException($error->message);
+            }
+        } catch (\Exception $e) {
+            throw new ParserException(
+                "Error parsing XML: {$e->getMessage()}",
+                0,
+                $e,
+                ['response' => $response]
+            );
+        } finally {
+            libxml_use_internal_errors($priorSetting);
+        }
+
+        return $xmlPayload;
+    }
+}

lib/aws/Aws/Api/Parser/QueryParser.php

@@ -0,0 +1,60 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\Service;
+use Aws\Api\StructureShape;
+use Aws\Result;
+use Aws\CommandInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * @internal Parses query (XML) responses (e.g., EC2, SQS, and many others)
+ */
+class QueryParser extends AbstractParser
+{
+    use PayloadParserTrait;
+
+    /** @var bool */
+    private $honorResultWrapper;
+
+    /**
+     * @param Service   $api                Service description
+     * @param XmlParser $xmlParser          Optional XML parser
+     * @param bool      $honorResultWrapper Set to false to disable the peeling
+     *                                      back of result wrappers from the
+     *                                      output structure.
+     */
+    public function __construct(
+        Service $api,
+        XmlParser $xmlParser = null,
+        $honorResultWrapper = true
+    ) {
+        parent::__construct($api);
+        $this->parser = $xmlParser ?: new XmlParser();
+        $this->honorResultWrapper = $honorResultWrapper;
+    }
+
+    public function __invoke(
+        CommandInterface $command,
+        ResponseInterface $response
+    ) {
+        $output = $this->api->getOperation($command->getName())->getOutput();
+        $xml = $this->parseXml($response->getBody(), $response);
+
+        if ($this->honorResultWrapper && $output['resultWrapper']) {
+            $xml = $xml->{$output['resultWrapper']};
+        }
+
+        return new Result($this->parser->parse($output, $xml));
+    }
+
+    public function parseMemberFromStream(
+        StreamInterface $stream,
+        StructureShape $member,
+        $response
+    ) {
+        $xml = $this->parseXml($stream, $response);
+        return $this->parser->parse($member, $xml);
+    }
+}

lib/aws/Aws/Api/Parser/RestJsonParser.php

@@ -0,0 +1,49 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\Service;
+use Aws\Api\StructureShape;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * @internal Implements REST-JSON parsing (e.g., Glacier, Elastic Transcoder)
+ */
+class RestJsonParser extends AbstractRestParser
+{
+    use PayloadParserTrait;
+
+    /**
+     * @param Service    $api    Service description
+     * @param JsonParser $parser JSON body builder
+     */
+    public function __construct(Service $api, JsonParser $parser = null)
+    {
+        parent::__construct($api);
+        $this->parser = $parser ?: new JsonParser();
+    }
+
+    protected function payload(
+        ResponseInterface $response,
+        StructureShape $member,
+        array &$result
+    ) {
+        $jsonBody = $this->parseJson($response->getBody(), $response);
+
+        if ($jsonBody) {
+            $result += $this->parser->parse($member, $jsonBody);
+        }
+    }
+
+    public function parseMemberFromStream(
+        StreamInterface $stream,
+        StructureShape $member,
+        $response
+    ) {
+        $jsonBody = $this->parseJson($stream, $response);
+        if ($jsonBody) {
+            return $this->parser->parse($member, $jsonBody);
+        }
+        return [];
+    }
+}

lib/aws/Aws/Api/Parser/RestXmlParser.php

@@ -0,0 +1,42 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\StructureShape;
+use Aws\Api\Service;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * @internal Implements REST-XML parsing (e.g., S3, CloudFront, etc...)
+ */
+class RestXmlParser extends AbstractRestParser
+{
+    use PayloadParserTrait;
+
+    /**
+     * @param Service   $api    Service description
+     * @param XmlParser $parser XML body parser
+     */
+    public function __construct(Service $api, XmlParser $parser = null)
+    {
+        parent::__construct($api);
+        $this->parser = $parser ?: new XmlParser();
+    }
+
+    protected function payload(
+        ResponseInterface $response,
+        StructureShape $member,
+        array &$result
+    ) {
+        $result += $this->parseMemberFromStream($response->getBody(), $member, $response);
+    }
+
+    public function parseMemberFromStream(
+        StreamInterface $stream,
+        StructureShape $member,
+        $response
+    ) {
+        $xml = $this->parseXml($stream, $response);
+        return $this->parser->parse($member, $xml);
+    }
+}

lib/aws/Aws/Api/Parser/XmlParser.php

@@ -0,0 +1,138 @@
+<?php
+namespace Aws\Api\Parser;
+
+use Aws\Api\DateTimeResult;
+use Aws\Api\ListShape;
+use Aws\Api\MapShape;
+use Aws\Api\Shape;
+use Aws\Api\StructureShape;
+
+/**
+ * @internal Implements standard XML parsing for REST-XML and Query protocols.
+ */
+class XmlParser
+{
+    public function parse(StructureShape $shape, \SimpleXMLElement $value)
+    {
+        return $this->dispatch($shape, $value);
+    }
+
+    private function dispatch($shape, \SimpleXMLElement $value)
+    {
+        static $methods = [
+            'structure' => 'parse_structure',
+            'list'      => 'parse_list',
+            'map'       => 'parse_map',
+            'blob'      => 'parse_blob',
+            'boolean'   => 'parse_boolean',
+            'integer'   => 'parse_integer',
+            'float'     => 'parse_float',
+            'double'    => 'parse_float',
+            'timestamp' => 'parse_timestamp',
+        ];
+
+        $type = $shape['type'];
+        if (isset($methods[$type])) {
+            return $this->{$methods[$type]}($shape, $value);
+        }
+
+        return (string) $value;
+    }
+
+    private function parse_structure(
+        StructureShape $shape,
+        \SimpleXMLElement $value
+    ) {
+        $target = [];
+
+        foreach ($shape->getMembers() as $name => $member) {
+            // Extract the name of the XML node
+            $node = $this->memberKey($member, $name);
+            if (isset($value->{$node})) {
+                $target[$name] = $this->dispatch($member, $value->{$node});
+            }
+        }
+
+        return $target;
+    }
+
+    private function memberKey(Shape $shape, $name)
+    {
+        if (null !== $shape['locationName']) {
+            return $shape['locationName'];
+        }
+
+        if ($shape instanceof ListShape && $shape['flattened']) {
+            return $shape->getMember()['locationName'] ?: $name;
+        }
+
+        return $name;
+    }
+
+    private function parse_list(ListShape $shape, \SimpleXMLElement  $value)
+    {
+        $target = [];
+        $member = $shape->getMember();
+
+        if (!$shape['flattened']) {
+            $value = $value->{$member['locationName'] ?: 'member'};
+        }
+
+        foreach ($value as $v) {
+            $target[] = $this->dispatch($member, $v);
+        }
+
+        return $target;
+    }
+
+    private function parse_map(MapShape $shape, \SimpleXMLElement $value)
+    {
+        $target = [];
+
+        if (!$shape['flattened']) {
+            $value = $value->entry;
+        }
+
+        $mapKey = $shape->getKey();
+        $mapValue = $shape->getValue();
+        $keyName = $shape->getKey()['locationName'] ?: 'key';
+        $valueName = $shape->getValue()['locationName'] ?: 'value';
+
+        foreach ($value as $node) {
+            $key = $this->dispatch($mapKey, $node->{$keyName});
+            $value = $this->dispatch($mapValue, $node->{$valueName});
+            $target[$key] = $value;
+        }
+
+        return $target;
+    }
+
+    private function parse_blob(Shape $shape, $value)
+    {
+        return base64_decode((string) $value);
+    }
+
+    private function parse_float(Shape $shape, $value)
+    {
+        return (float) (string) $value;
+    }
+
+    private function parse_integer(Shape $shape, $value)
+    {
+        return (int) (string) $value;
+    }
+
+    private function parse_boolean(Shape $shape, $value)
+    {
+        return $value == 'true';
+    }
+
+    private function parse_timestamp(Shape $shape, $value)
+    {
+        if (!empty($shape['timestampFormat'])
+            && $shape['timestampFormat'] === 'unixTimestamp') {
+            return DateTimeResult::fromEpoch((string) $value);
+        }
+        return new DateTimeResult($value);
+    }
+}