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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * SPDX-License-Identifier: EUPL-1.2 |
| 5 | * |
| 6 | * This file is part of icap-flow. |
| 7 | * |
| 8 | * Licensed under the EUPL, Version 1.2 only (the "Licence"); |
| 9 | * you may not use this work except in compliance with the Licence. |
| 10 | * You may obtain a copy of the Licence at: |
| 11 | * |
| 12 | * https://joinup.ec.europa.eu/collection/eupl/eupl-text-eupl-12 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the Licence is distributed on an "AS IS" basis, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | */ |
| 18 | |
| 19 | declare(strict_types=1); |
| 20 | |
| 21 | namespace Ndrstmr\Icap; |
| 22 | |
| 23 | use Ndrstmr\Icap\DTO\IcapResponse; |
| 24 | use Ndrstmr\Icap\Exception\IcapMalformedResponseException; |
| 25 | |
| 26 | /** |
| 27 | * Parses raw ICAP server responses into {@link IcapResponse} value |
| 28 | * objects. A string is one complete response: {@see ResponseDecoder} reads it |
| 29 | * by its `Encapsulated` layout (RFC 3507 §4.4) with the same rules the |
| 30 | * transports frame it by, and decodes the chunked body. A response that does |
| 31 | * not follow them, is cut off, or has bytes behind its end is refused. |
| 32 | */ |
| 33 | final class ResponseParser implements ResponseParserInterface |
| 34 | { |
| 35 | private const int DEFAULT_MAX_HEADER_COUNT = 100; |
| 36 | private const int DEFAULT_MAX_HEADER_LINE = 8192; |
| 37 | |
| 38 | public function __construct( |
| 39 | private readonly int $maxHeaderCount = self::DEFAULT_MAX_HEADER_COUNT, |
| 40 | private readonly int $maxHeaderLineLength = self::DEFAULT_MAX_HEADER_LINE, |
| 41 | ) { |
| 42 | if ($maxHeaderCount < 1 || $maxHeaderLineLength < 1) { |
| 43 | throw new \InvalidArgumentException('Parser limits must be >= 1'); |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | #[\Override] |
| 48 | public function parse(string $rawResponse): IcapResponse |
| 49 | { |
| 50 | // All the bytes are here, so the response cannot be larger than they are. |
| 51 | $decoder = new ResponseDecoder( |
| 52 | maxResponseSize: max(1, strlen($rawResponse)), |
| 53 | maxHeaderCount: $this->maxHeaderCount, |
| 54 | maxHeaderLineLength: $this->maxHeaderLineLength, |
| 55 | ); |
| 56 | $decoder->feed($rawResponse); |
| 57 | |
| 58 | if (!$decoder->isComplete()) { |
| 59 | throw new IcapMalformedResponseException('Invalid ICAP response: it ends before the response is complete.'); |
| 60 | } |
| 61 | if ($decoder->remainder() !== '') { |
| 62 | throw new IcapMalformedResponseException('Invalid ICAP response: bytes follow the end of the response.'); |
| 63 | } |
| 64 | |
| 65 | return $decoder->response(); |
| 66 | } |
| 67 | } |