766 lines
24 KiB
PHP
766 lines
24 KiB
PHP
<?php
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/**
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* Copyright 2010-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License").
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* You may not use this file except in compliance with the License.
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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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namespace Aws\S3;
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use Aws\Common\Exception\RuntimeException;
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use Aws\S3\Exception\S3Exception;
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use Aws\S3\Exception\NoSuchKeyException;
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use Aws\S3\Iterator\ListObjectsIterator;
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use Guzzle\Http\QueryString;
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use Guzzle\Http\EntityBody;
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use Guzzle\Http\CachingEntityBody;
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use Guzzle\Stream\PhpStreamRequestFactory;
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use Guzzle\Service\Command\CommandInterface;
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/**
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* Amazon S3 stream wrapper to use "s3://<bucket>/<key>" files with PHP streams, supporting "r", "w", "a", "x".
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*
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* # Supported stream related PHP functions:
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* - fopen, fclose, fread, fwrite, fseek, ftell, feof, fflush
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* - opendir, closedir, readdir, rewinddir
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* - copy, rename, unlink
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* - mkdir, rmdir, rmdir (recursive)
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* - file_get_contents, file_put_contents
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* - file_exists, filesize, is_file, is_dir
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*
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* # Opening "r" (read only) streams:
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*
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* Read only streams are truly streaming by default and will not allow you to seek. This is because data
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* read from the stream is not kept in memory or on the local filesystem. You can force a "r" stream to be seekable
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* by setting the "seekable" stream context option true. This will allow true streaming of data from Amazon S3, but
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* will maintain a buffer of previously read bytes in a 'php://temp' stream to allow seeking to previously read bytes
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* from the stream.
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*
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* You may pass any GetObject parameters as 's3' stream context options. These options will affect how the data is
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* downloaded from Amazon S3.
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*
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* # Opening "w" and "x" (write only) streams:
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*
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* Because Amazon S3 requires a Content-Length header, write only streams will maintain a 'php://temp' stream to buffer
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* data written to the stream until the stream is flushed (usually by closing the stream with fclose).
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*
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* You may pass any PutObject parameters as 's3' stream context options. These options will affect how the data is
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* uploaded to Amazon S3.
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*
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* When opening an "x" stream, the file must exist on Amazon S3 for the stream to open successfully.
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*
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* # Opening "a" (write only append) streams:
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*
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* Similar to "w" streams, opening append streams requires that the data be buffered in a "php://temp" stream. Append
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* streams will attempt to download the contents of an object in Amazon S3, seek to the end of the object, then allow
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* you to append to the contents of the object. The data will then be uploaded using a PutObject operation when the
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* stream is flushed (usually with fclose).
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*
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* You may pass any GetObject and/or PutObject parameters as 's3' stream context options. These options will affect how
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* the data is downloaded and uploaded from Amazon S3.
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*
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* Stream context options:
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*
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* - "seekable": Set to true to create a seekable "r" (read only) stream by using a php://temp stream buffer
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* - "throw_exceptions": Set to true to throw exceptions instead of trigger_errors
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* - For "unlink" only: Any option that can be passed to the DeleteObject operation
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*/
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class StreamWrapper
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{
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/**
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* @var resource|null Stream context (this is set by PHP when a context is used)
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*/
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public $context;
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/**
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* @var S3Client Client used to send requests
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*/
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protected static $client;
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/**
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* @var string Mode the stream was opened with
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*/
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protected $mode;
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/**
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* @var EntityBody Underlying stream resource
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*/
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protected $body;
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/**
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* @var array Current parameters to use with the flush operation
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*/
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protected $params;
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/**
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* @var ListObjectsIterator Iterator used with opendir() and subsequent readdir() calls
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*/
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protected $objectIterator;
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/**
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* @var string The bucket that was opened when opendir() was called
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*/
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protected $openedBucket;
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/**
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* @var string The prefix of the bucket that was opened with opendir()
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*/
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protected $openedBucketPrefix;
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/**
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* @var array The next key to retrieve when using a directory iterator. Helps for fast directory traversal.
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*/
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protected static $nextStat = array();
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/**
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* Register the 's3://' stream wrapper
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*
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* @param S3Client $client Client to use with the stream wrapper
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*/
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public static function register(S3Client $client)
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{
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if (in_array('s3', stream_get_wrappers())) {
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stream_wrapper_unregister('s3');
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}
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stream_wrapper_register('s3', __CLASS__, STREAM_IS_URL);
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self::$client = $client;
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}
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/**
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* Close the stream
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*/
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public function stream_close()
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{
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$this->body = null;
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}
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/**
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* @param string $path
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* @param string $mode
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* @param int $options
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* @param string $opened_path
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*
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* @return bool
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*/
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public function stream_open($path, $mode, $options, &$opened_path)
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{
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// We don't care about the binary flag
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$this->mode = $mode = rtrim($mode, 'bt');
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$this->params = $params = $this->getParams($path);
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$errors = array();
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if (!$params['Key']) {
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$errors[] = 'Cannot open a bucket. You must specify a path in the form of s3://bucket/key';
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}
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if (strpos($mode, '+')) {
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$errors[] = 'The Amazon S3 stream wrapper does not allow simultaneous reading and writing.';
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}
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if (!in_array($mode, array('r', 'w', 'a', 'x'))) {
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$errors[] = "Mode not supported: {$mode}. Use one 'r', 'w', 'a', or 'x'.";
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}
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// When using mode "x" validate if the file exists before attempting to read
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if ($mode == 'x' && !self::$client->doesObjectExist($params['Bucket'], $params['Key'], $this->getOptions())) {
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$errors[] = "{$path} does not exist on Amazon S3";
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}
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if (!$errors) {
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if ($mode == 'r') {
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$this->openReadStream($params, $errors);
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} elseif ($mode == 'a') {
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$this->openAppendStream($params, $errors);
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} else {
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$this->openWriteStream($params, $errors);
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}
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}
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return $errors ? $this->triggerError($errors) : true;
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}
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/**
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* @return bool
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*/
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public function stream_eof()
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{
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return $this->body->feof();
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}
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/**
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* @return bool
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*/
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public function stream_flush()
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{
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if ($this->mode == 'r') {
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return false;
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}
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$this->body->rewind();
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$params = $this->params;
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$params['Body'] = $this->body;
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try {
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self::$client->putObject($params);
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return true;
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} catch (\Exception $e) {
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return $this->triggerError($e->getMessage());
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}
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}
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/**
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* Read data from the underlying stream
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*
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* @param int $count Amount of bytes to read
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*
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* @return string
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*/
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public function stream_read($count)
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{
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return $this->body->read($count);
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}
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/**
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* Seek to a specific byte in the stream
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*
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* @param int $offset Seek offset
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* @param int $whence Whence (SEEK_SET, SEEK_CUR, SEEK_END)
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*
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* @return bool
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*/
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public function stream_seek($offset, $whence = SEEK_SET)
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{
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return $this->body->seek($offset, $whence);
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}
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/**
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* Get the current position of the stream
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*
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* @return int Returns the current position in the stream
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*/
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public function stream_tell()
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{
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return $this->body->ftell();
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}
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/**
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* Write data the to the stream
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*
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* @param string $data
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*
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* @return int Returns the number of bytes written to the stream
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*/
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public function stream_write($data)
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{
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return $this->body->write($data);
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}
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/**
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* Delete a specific object
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*
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* @param string $path
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* @return bool
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*/
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public function unlink($path)
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{
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try {
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$this->clearStatInfo($path);
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self::$client->deleteObject($this->getParams($path));
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return true;
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} catch (\Exception $e) {
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return $this->triggerError($e->getMessage());
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}
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}
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/**
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* @return array
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*/
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public function stream_stat()
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{
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$stat = fstat($this->body->getStream());
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// Add the size of the underlying stream if it is known
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if ($this->mode == 'r' && $this->body->getSize()) {
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$stat[7] = $stat['size'] = $this->body->getSize();
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}
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return $stat;
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}
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/**
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* Provides information for is_dir, is_file, filesize, etc. Works on buckets, keys, and prefixes
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*
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* @param string $path
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* @param int $flags
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*
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* @return array Returns an array of stat data
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* @link http://www.php.net/manual/en/streamwrapper.url-stat.php
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*/
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public function url_stat($path, $flags)
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{
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// Check if this path is in the url_stat cache
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if (isset(self::$nextStat[$path])) {
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return self::$nextStat[$path];
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}
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$parts = $this->getParams($path);
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// Stat a bucket or just s3://
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if (!$parts['Key'] && (!$parts['Bucket'] || self::$client->doesBucketExist($parts['Bucket']))) {
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return $this->formatUrlStat($path);
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}
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// You must pass either a bucket or a bucket + key
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if (!$parts['Key']) {
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return $this->triggerError("File or directory not found: {$path}", $flags);
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}
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try {
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try {
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// Attempt to stat and cache regular object
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return $this->formatUrlStat(self::$client->headObject($parts)->toArray());
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} catch (NoSuchKeyException $e) {
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// Maybe this isn't an actual key, but a prefix. Do a prefix listing of objects to determine.
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$result = self::$client->listObjects(array(
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'Bucket' => $parts['Bucket'],
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'Prefix' => $parts['Key'],
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'MaxKeys' => 1
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));
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if (!$result['Contents'] && !$result['CommonPrefixes']) {
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return $this->triggerError("File or directory not found: {$path}", $flags);
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}
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// This is a directory prefix
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return $this->formatUrlStat($path);
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}
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} catch (\Exception $e) {
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return $this->triggerError($e->getMessage(), $flags);
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}
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}
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/**
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* Support for mkdir().
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*
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* @param string $path Directory which should be created.
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* @param int $mode Permissions. 700-range permissions map to ACL_PUBLIC. 600-range permissions map to
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* ACL_AUTH_READ. All other permissions map to ACL_PRIVATE. Expects octal form.
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* @param int $options A bitwise mask of values, such as STREAM_MKDIR_RECURSIVE. (unused)
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*
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* @return bool
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* @link http://www.php.net/manual/en/streamwrapper.mkdir.php
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*/
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public function mkdir($path, $mode, $options)
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{
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$params = $this->getParams($path);
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$this->clearStatInfo($path);
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if (!$params['Bucket'] || $params['Key']) {
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return false;
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}
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try {
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if (!isset($params['ACL'])) {
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$mode = decoct($mode);
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if ($mode >= 700 and $mode <= 799) {
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$params['ACL'] = 'public-read';
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} elseif ($mode >= 600 && $mode <= 699) {
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$params['ACL'] = 'authenticated-read';
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} else {
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$params['ACL'] = 'private';
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}
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}
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self::$client->createBucket($params);
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return true;
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} catch (\Exception $e) {
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return $this->triggerError($e->getMessage());
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}
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}
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/**
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* Remove a bucket from Amazon S3
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*
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* @param string $path the directory path
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*
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* @return bool true if directory was successfully removed
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* @link http://www.php.net/manual/en/streamwrapper.rmdir.php
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*/
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public function rmdir($path)
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{
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$params = $this->getParams($path);
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if (!$params['Bucket']) {
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return $this->triggerError('You cannot delete s3://. Please specify a bucket.');
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} elseif ($params['Key']) {
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return $this->triggerError('rmdir() only supports bucket deletion');
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}
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try {
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self::$client->deleteBucket(array('Bucket' => $params['Bucket']));
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$this->clearStatInfo($path);
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return true;
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} catch (\Exception $e) {
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return $this->triggerError($e->getMessage());
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}
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}
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/**
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* Support for opendir().
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*
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* @param string $path The path to the directory (e.g. "s3://dir[</prefix>]")
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* @param string $options Whether or not to enforce safe_mode (0x04). Unused.
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*
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* @return bool true on success
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* @see http://www.php.net/manual/en/function.opendir.php
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*/
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public function dir_opendir($path, $options)
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{
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// Reset the cache
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$this->clearStatInfo();
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$params = $this->getParams($path);
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$delimiter = $this->getOption('delimiter');
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if ($delimiter === null) {
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$delimiter = '/';
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}
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if ($params['Key']) {
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$suffix = $delimiter ?: '/';
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$params['Key'] = rtrim($params['Key'], $suffix) . $suffix;
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}
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$this->openedBucket = $params['Bucket'];
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$this->openedBucketPrefix = $params['Key'];
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$operationParams = array('Bucket' => $params['Bucket'], 'Prefix' => $params['Key']);
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if ($delimiter) {
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$operationParams['Delimiter'] = $delimiter;
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}
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$this->objectIterator = self::$client->getIterator('ListObjects', $operationParams, array(
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'return_prefixes' => true,
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'sort_results' => true
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));
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$this->objectIterator->next();
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|
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return true;
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}
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|
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/**
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* Close the directory listing handles
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*
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* @return bool true on success
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*/
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public function dir_closedir()
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{
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$this->objectIterator = null;
|
|
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return true;
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}
|
|
|
|
/**
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* This method is called in response to rewinddir()
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|
*
|
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* @return boolean true on success
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*/
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public function dir_rewinddir()
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{
|
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$this->clearStatInfo();
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$this->objectIterator->rewind();
|
|
|
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return true;
|
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}
|
|
|
|
/**
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|
* This method is called in response to readdir()
|
|
*
|
|
* @return string Should return a string representing the next filename, or false if there is no next file.
|
|
*
|
|
* @link http://www.php.net/manual/en/function.readdir.php
|
|
*/
|
|
public function dir_readdir()
|
|
{
|
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$result = false;
|
|
if ($this->objectIterator->valid()) {
|
|
$current = $this->objectIterator->current();
|
|
if (isset($current['Prefix'])) {
|
|
// Include "directories"
|
|
$result = str_replace($this->openedBucketPrefix, '', $current['Prefix']);
|
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$key = "s3://{$this->openedBucket}/{$current['Prefix']}";
|
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$stat = $this->formatUrlStat($current['Prefix']);
|
|
} else {
|
|
// Remove the prefix from the result to emulate other stream wrappers
|
|
$result = str_replace($this->openedBucketPrefix, '', $current['Key']);
|
|
$key = "s3://{$this->openedBucket}/{$current['Key']}";
|
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$stat = $this->formatUrlStat($current);
|
|
}
|
|
|
|
// Cache the object data for quick url_stat lookups used with RecursiveDirectoryIterator
|
|
self::$nextStat = array($key => $stat);
|
|
$this->objectIterator->next();
|
|
}
|
|
|
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return $result;
|
|
}
|
|
|
|
/**
|
|
* Called in response to rename() to rename a file or directory. Currently only supports renaming objects.
|
|
*
|
|
* @param string $path_from the path to the file to rename
|
|
* @param string $path_to the new path to the file
|
|
*
|
|
* @return bool true if file was successfully renamed
|
|
* @link http://www.php.net/manual/en/function.rename.php
|
|
*/
|
|
public function rename($path_from, $path_to)
|
|
{
|
|
$partsFrom = $this->getParams($path_from);
|
|
$partsTo = $this->getParams($path_to);
|
|
$this->clearStatInfo($path_from);
|
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$this->clearStatInfo($path_to);
|
|
|
|
if (!$partsFrom['Key'] || !$partsTo['Key']) {
|
|
return $this->triggerError('The Amazon S3 stream wrapper only supports copying objects');
|
|
}
|
|
|
|
try {
|
|
// Copy the object and allow overriding default parameters if desired, but by default copy metadata
|
|
self::$client->copyObject($this->getOptions() + array(
|
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'Bucket' => $partsTo['Bucket'],
|
|
'Key' => $partsTo['Key'],
|
|
'CopySource' => '/' . $partsFrom['Bucket'] . '/' . rawurlencode($partsFrom['Key']),
|
|
'MetadataDirective' => 'COPY'
|
|
));
|
|
// Delete the original object
|
|
self::$client->deleteObject(array(
|
|
'Bucket' => $partsFrom['Bucket'],
|
|
'Key' => $partsFrom['Key']
|
|
) + $this->getOptions());
|
|
} catch (\Exception $e) {
|
|
return $this->triggerError($e->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Cast the stream to return the underlying file resource
|
|
*
|
|
* @param int $cast_as STREAM_CAST_FOR_SELECT or STREAM_CAST_AS_STREAM
|
|
*
|
|
* @return resource
|
|
*/
|
|
public function stream_cast($cast_as)
|
|
{
|
|
return $this->body->getStream();
|
|
}
|
|
|
|
/**
|
|
* Get the stream context options available to the current stream
|
|
*
|
|
* @return array
|
|
*/
|
|
protected function getOptions()
|
|
{
|
|
$context = $this->context ?: stream_context_get_default();
|
|
$options = stream_context_get_options($context);
|
|
|
|
return isset($options['s3']) ? $options['s3'] : array();
|
|
}
|
|
|
|
/**
|
|
* Get a specific stream context option
|
|
*
|
|
* @param string $name Name of the option to retrieve
|
|
*
|
|
* @return mixed|null
|
|
*/
|
|
protected function getOption($name)
|
|
{
|
|
$options = $this->getOptions();
|
|
|
|
return isset($options[$name]) ? $options[$name] : null;
|
|
}
|
|
|
|
/**
|
|
* Get the bucket and key from the passed path (e.g. s3://bucket/key)
|
|
*
|
|
* @param string $path Path passed to the stream wrapper
|
|
*
|
|
* @return array Hash of 'Bucket', 'Key', and custom params
|
|
*/
|
|
protected function getParams($path)
|
|
{
|
|
$parts = explode('/', substr($path, 5), 2);
|
|
|
|
$params = $this->getOptions();
|
|
unset($params['seekable']);
|
|
unset($params['throw_exceptions']);
|
|
|
|
return array(
|
|
'Bucket' => $parts[0],
|
|
'Key' => isset($parts[1]) ? $parts[1] : null
|
|
) + $params;
|
|
}
|
|
|
|
/**
|
|
* Serialize and sign a command, returning a request object
|
|
*
|
|
* @param CommandInterface $command Command to sign
|
|
*
|
|
* @return RequestInterface
|
|
*/
|
|
protected function getSignedRequest($command)
|
|
{
|
|
$request = $command->prepare();
|
|
$request->dispatch('request.before_send', array('request' => $request));
|
|
|
|
return $request;
|
|
}
|
|
|
|
/**
|
|
* Initialize the stream wrapper for a read only stream
|
|
*
|
|
* @param array $params Operation parameters
|
|
* @param array $errors Any encountered errors to append to
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function openReadStream(array $params, array &$errors)
|
|
{
|
|
// Create the command and serialize the request
|
|
$request = $this->getSignedRequest(self::$client->getCommand('GetObject', $params));
|
|
// Create a stream that uses the EntityBody object
|
|
$factory = $this->getOption('stream_factory') ?: new PhpStreamRequestFactory();
|
|
$this->body = $factory->fromRequest($request, array(), array('stream_class' => 'Guzzle\Http\EntityBody'));
|
|
|
|
// Wrap the body in a caching entity body if seeking is allowed
|
|
if ($this->getOption('seekable')) {
|
|
$this->body = new CachingEntityBody($this->body);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Initialize the stream wrapper for a write only stream
|
|
*
|
|
* @param array $params Operation parameters
|
|
* @param array $errors Any encountered errors to append to
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function openWriteStream(array $params, array &$errors)
|
|
{
|
|
$this->body = new EntityBody(fopen('php://temp', 'r+'));
|
|
}
|
|
|
|
/**
|
|
* Initialize the stream wrapper for an append stream
|
|
*
|
|
* @param array $params Operation parameters
|
|
* @param array $errors Any encountered errors to append to
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function openAppendStream(array $params, array &$errors)
|
|
{
|
|
try {
|
|
// Get the body of the object
|
|
$this->body = self::$client->getObject($params)->get('Body');
|
|
$this->body->seek(0, SEEK_END);
|
|
} catch (S3Exception $e) {
|
|
// The object does not exist, so use a simple write stream
|
|
$this->openWriteStream($params, $errors);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Trigger one or more errors
|
|
*
|
|
* @param string|array $errors Errors to trigger
|
|
* @param mixed $flags If set to STREAM_URL_STAT_QUIET, then no error or exception occurs
|
|
*
|
|
* @return bool Returns false
|
|
* @throws RuntimeException if throw_errors is true
|
|
*/
|
|
protected function triggerError($errors, $flags = null)
|
|
{
|
|
if ($flags != STREAM_URL_STAT_QUIET) {
|
|
if ($this->getOption('throw_exceptions')) {
|
|
throw new RuntimeException(implode("\n", (array) $errors));
|
|
} else {
|
|
trigger_error(implode("\n", (array) $errors), E_USER_WARNING);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Prepare a url_stat result array
|
|
*
|
|
* @param string|array $result Data to add
|
|
*
|
|
* @return array Returns the modified url_stat result
|
|
*/
|
|
protected function formatUrlStat($result = null)
|
|
{
|
|
static $statTemplate = array(
|
|
0 => 0, 'dev' => 0,
|
|
1 => 0, 'ino' => 0,
|
|
2 => 0, 'mode' => 0,
|
|
3 => 0, 'nlink' => 0,
|
|
4 => 0, 'uid' => 0,
|
|
5 => 0, 'gid' => 0,
|
|
6 => -1, 'rdev' => -1,
|
|
7 => 0, 'size' => 0,
|
|
8 => 0, 'atime' => 0,
|
|
9 => 0, 'mtime' => 0,
|
|
10 => 0, 'ctime' => 0,
|
|
11 => -1, 'blksize' => -1,
|
|
12 => -1, 'blocks' => -1,
|
|
);
|
|
|
|
$stat = $statTemplate;
|
|
|
|
// Determine what type of data is being cached
|
|
if (!$result || is_string($result)) {
|
|
// Directory with 0777 access - see "man 2 stat".
|
|
$stat['mode'] = $stat[2] = 0040777;
|
|
} elseif (is_array($result) && isset($result['LastModified'])) {
|
|
// ListObjects or HeadObject result
|
|
$stat['mtime'] = $stat[9] = $stat['ctime'] = $stat[10] = strtotime($result['LastModified']);
|
|
$stat['size'] = $stat[7] = (isset($result['ContentLength']) ? $result['ContentLength'] : $result['Size']);
|
|
// Regular file with 0777 access - see "man 2 stat".
|
|
$stat['mode'] = $stat[2] = 0100777;
|
|
} else {
|
|
$stat['mode'] = $stat[2] = 0100777;
|
|
}
|
|
|
|
return $stat;
|
|
}
|
|
|
|
/**
|
|
* Clear the next stat result from the cache
|
|
*
|
|
* @param string $path If a path is specific, clearstatcache() will be called
|
|
*/
|
|
protected function clearStatInfo($path = null)
|
|
{
|
|
self::$nextStat = array();
|
|
if ($path) {
|
|
clearstatcache(true, $path);
|
|
}
|
|
}
|
|
}
|