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Merge pull request #20965 from nextcloud/backport/20033/stable18
[stable18] Enable fseek for files in S3 storage
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,192 @@ | ||
| <?php | ||
| /** | ||
| * | ||
| * @copyright Copyright (c) 2020, Lukas Stabe (lukas@stabe.de) | ||
| * | ||
| * @license GNU AGPL version 3 or any later version | ||
| * | ||
| * This program 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. | ||
| * | ||
| * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. | ||
| * | ||
| */ | ||
|
|
||
| namespace OC\Files\Stream; | ||
|
|
||
| use Icewind\Streams\File; | ||
|
|
||
| /** | ||
| * A stream wrapper that uses http range requests to provide a seekable stream for http reading | ||
| */ | ||
| class SeekableHttpStream implements File { | ||
| private const PROTOCOL = 'httpseek'; | ||
|
|
||
| private static $registered = false; | ||
|
|
||
| /** | ||
| * Registers the stream wrapper using the `httpseek://` url scheme | ||
| * $return void | ||
| */ | ||
| private static function registerIfNeeded() { | ||
| if (!self::$registered) { | ||
| stream_wrapper_register( | ||
| self::PROTOCOL, | ||
| self::class | ||
| ); | ||
| self::$registered = true; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Open a readonly-seekable http stream | ||
| * | ||
| * The provided callback will be called with byte range and should return an http stream for the requested range | ||
| * | ||
| * @param callable $callback | ||
| * @return false|resource | ||
| */ | ||
| public static function open(callable $callback) { | ||
| $context = stream_context_create([ | ||
| SeekableHttpStream::PROTOCOL => [ | ||
| 'callback' => $callback | ||
| ], | ||
| ]); | ||
|
|
||
| SeekableHttpStream::registerIfNeeded(); | ||
| return fopen(SeekableHttpStream::PROTOCOL . '://', 'r', false, $context); | ||
| } | ||
|
|
||
| /** @var resource */ | ||
| public $context; | ||
|
|
||
| /** @var callable */ | ||
| private $openCallback; | ||
|
|
||
| /** @var resource */ | ||
| private $current; | ||
| /** @var int */ | ||
| private $offset = 0; | ||
|
|
||
| private function reconnect(int $start) { | ||
| $range = $start . '-'; | ||
| if ($this->current != null) { | ||
| fclose($this->current); | ||
| } | ||
|
|
||
| $this->current = ($this->openCallback)($range); | ||
|
|
||
| if ($this->current === false) { | ||
| return false; | ||
| } | ||
|
|
||
| $responseHead = stream_get_meta_data($this->current)['wrapper_data']; | ||
| $rangeHeaders = array_values(array_filter($responseHead, function ($v) { | ||
| return preg_match('#^content-range:#i', $v) === 1; | ||
| })); | ||
| if (!$rangeHeaders) { | ||
| return false; | ||
| } | ||
| $contentRange = $rangeHeaders[0]; | ||
|
|
||
| $content = trim(explode(':', $contentRange)[1]); | ||
| $range = trim(explode(' ', $content)[1]); | ||
| $begin = intval(explode('-', $range)[0]); | ||
|
|
||
| if ($begin !== $start) { | ||
| return false; | ||
| } | ||
|
|
||
| $this->offset = $begin; | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| public function stream_open($path, $mode, $options, &$opened_path) { | ||
| $options = stream_context_get_options($this->context)[self::PROTOCOL]; | ||
| $this->openCallback = $options['callback']; | ||
|
|
||
| return $this->reconnect(0); | ||
| } | ||
|
|
||
| public function stream_read($count) { | ||
| if (!$this->current) { | ||
| return false; | ||
| } | ||
| $ret = fread($this->current, $count); | ||
| $this->offset += strlen($ret); | ||
| return $ret; | ||
| } | ||
|
|
||
| public function stream_seek($offset, $whence = SEEK_SET) { | ||
| switch ($whence) { | ||
| case SEEK_SET: | ||
| if ($offset === $this->offset) { | ||
| return true; | ||
| } | ||
| return $this->reconnect($offset); | ||
| case SEEK_CUR: | ||
| if ($offset === 0) { | ||
| return true; | ||
| } | ||
| return $this->reconnect($this->offset + $offset); | ||
| case SEEK_END: | ||
| return false; | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| public function stream_tell() { | ||
| return $this->offset; | ||
| } | ||
|
|
||
| public function stream_stat() { | ||
| if (is_resource($this->current)) { | ||
| return fstat($this->current); | ||
| } else { | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| public function stream_eof() { | ||
| if (is_resource($this->current)) { | ||
| return feof($this->current); | ||
| } else { | ||
| return true; | ||
| } | ||
| } | ||
|
|
||
| public function stream_close() { | ||
| if (is_resource($this->current)) { | ||
| fclose($this->current); | ||
| } | ||
| } | ||
|
|
||
| public function stream_write($data) { | ||
| return false; | ||
| } | ||
|
|
||
| public function stream_set_option($option, $arg1, $arg2) { | ||
| return false; | ||
| } | ||
|
|
||
| public function stream_truncate($size) { | ||
| return false; | ||
| } | ||
|
|
||
| public function stream_lock($operation) { | ||
| return false; | ||
| } | ||
|
|
||
| public function stream_flush() { | ||
| return; //noop because readonly stream | ||
| } | ||
| } |
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