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Editing: Parser.php
<?php // SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue // SPDX-License-Identifier: BSD-3-Clause declare(strict_types=1); namespace SimplePie\HTTP; /** * HTTP Response Parser * @template Psr7Compatible of bool */ class Parser { /** * HTTP Version * * @var float */ public $http_version = 0.0; /** * Status code * * @var int */ public $status_code = 0; /** * Reason phrase * * @var string */ public $reason = ''; /** * @var Psr7Compatible whether headers are compatible with PSR-7 format. */ private $psr7Compatible; /** * Key/value pairs of the headers * * @var (Psr7Compatible is true ? array<string, non-empty-array<string>> : array<string, string>) */ public $headers = []; /** * Body of the response * * @var string */ public $body = ''; private const STATE_HTTP_VERSION = 'http_version'; private const STATE_STATUS = 'status'; private const STATE_REASON = 'reason'; private const STATE_NEW_LINE = 'new_line'; private const STATE_BODY = 'body'; private const STATE_NAME = 'name'; private const STATE_VALUE = 'value'; private const STATE_VALUE_CHAR = 'value_char'; private const STATE_QUOTE = 'quote'; private const STATE_QUOTE_ESCAPED = 'quote_escaped'; private const STATE_QUOTE_CHAR = 'quote_char'; private const STATE_CHUNKED = 'chunked'; private const STATE_EMIT = 'emit'; private const STATE_ERROR = false; /** * Current state of the state machine * * @var self::STATE_* */ protected $state = self::STATE_HTTP_VERSION; /** * Input data * * @var string */ protected $data = ''; /** * Input data length (to avoid calling strlen() everytime this is needed) * * @var int */ protected $data_length = 0; /** * Current position of the pointer * * @var int */ protected $position = 0; /** * Name of the header currently being parsed * * @var string */ protected $name = ''; /** * Value of the header currently being parsed * * @var string */ protected $value = ''; /** * Create an instance of the class with the input data * * @param string $data Input data * @param Psr7Compatible $psr7Compatible Whether the data types are in format compatible with PSR-7. */ public function __construct(string $data, bool $psr7Compatible = false) { $this->data = $data; $this->data_length = strlen($this->data); $this->psr7Compatible = $psr7Compatible; } /** * Parse the input data * * @return bool true on success, false on failure */ public function parse() { while ($this->state && $this->state !== self::STATE_EMIT && $this->has_data()) { $state = $this->state; $this->$state(); } $this->data = ''; if ($this->state === self::STATE_EMIT || $this->state === self::STATE_BODY) { return true; } // Reset the parser state. $this->http_version = 0.0; $this->status_code = 0; $this->reason = ''; $this->headers = []; $this->body = ''; return false; } /** * Check whether there is data beyond the pointer * * @return bool true if there is further data, false if not */ protected function has_data() { return (bool) ($this->position < $this->data_length); } /** * See if the next character is LWS * * @return bool true if the next character is LWS, false if not */ protected function is_linear_whitespace() { return (bool) ($this->data[$this->position] === "\x09" || $this->data[$this->position] === "\x20" || ($this->data[$this->position] === "\x0A" && isset($this->data[$this->position + 1]) && ($this->data[$this->position + 1] === "\x09" || $this->data[$this->position + 1] === "\x20"))); } /** * Parse the HTTP version * @return void */ protected function http_version() { if (strpos($this->data, "\x0A") !== false && strtoupper(substr($this->data, 0, 5)) === 'HTTP/') { $len = strspn($this->data, '0123456789.', 5); $http_version = substr($this->data, 5, $len); $this->position += 5 + $len; if (substr_count($http_version, '.') <= 1) { $this->http_version = (float) $http_version; $this->position += strspn($this->data, "\x09\x20", $this->position); $this->state = self::STATE_STATUS; } else { $this->state = self::STATE_ERROR; } } else { $this->state = self::STATE_ERROR; } } /** * Parse the status code * @return void */ protected function status() { if ($len = strspn($this->data, '0123456789', $this->position)) { $this->status_code = (int) substr($this->data, $this->position, $len); $this->position += $len; $this->state = self::STATE_REASON; } else { $this->state = self::STATE_ERROR; } } /** * Parse the reason phrase * @return void */ protected function reason() { $len = strcspn($this->data, "\x0A", $this->position); $this->reason = trim(substr($this->data, $this->position, $len), "\x09\x0D\x20"); $this->position += $len + 1; $this->state = self::STATE_NEW_LINE; } private function add_header(string $name, string $value): void { if ($this->psr7Compatible) { // For PHPStan: should be enforced by template parameter but PHPStan is not smart enough. /** @var array<string, non-empty-array<string>> */ $headers = &$this->headers; $headers[$name][] = $value; } else { // For PHPStan: should be enforced by template parameter but PHPStan is not smart enough. /** @var array<string, string>) */ $headers = &$this->headers; $headers[$name] .= ', ' . $value; } } private function replace_header(string $name, string $value): void { if ($this->psr7Compatible) { // For PHPStan: should be enforced by template parameter but PHPStan is not smart enough. /** @var array<string, non-empty-array<string>> */ $headers = &$this->headers; $headers[$name] = [$value]; } else { // For PHPStan: should be enforced by template parameter but PHPStan is not smart enough. /** @var array<string, string>) */ $headers = &$this->headers; $headers[$name] = $value; } } /** * Deal with a new line, shifting data around as needed * @return void */ protected function new_line() { $this->value = trim($this->value, "\x0D\x20"); if ($this->name !== '' && $this->value !== '') { $this->name = strtolower($this->name); // We should only use the last Content-Type header. c.f. issue #1 if (isset($this->headers[$this->name]) && $this->name !== 'content-type') { $this->add_header($this->name, $this->value); } else { $this->replace_header($this->name, $this->value); } } $this->name = ''; $this->value = ''; if (substr($this->data[$this->position], 0, 2) === "\x0D\x0A") { $this->position += 2; $this->state = self::STATE_BODY; } elseif ($this->data[$this->position] === "\x0A") { $this->position++; $this->state = self::STATE_BODY; } else { $this->state = self::STATE_NAME; } } /** * Parse a header name * @return void */ protected function name() { $len = strcspn($this->data, "\x0A:", $this->position); if (isset($this->data[$this->position + $len])) { if ($this->data[$this->position + $len] === "\x0A") { $this->position += $len; $this->state = self::STATE_NEW_LINE; } else { $this->name = substr($this->data, $this->position, $len); $this->position += $len + 1; $this->state = self::STATE_VALUE; } } else { $this->state = self::STATE_ERROR; } } /** * Parse LWS, replacing consecutive LWS characters with a single space * @return void */ protected function linear_whitespace() { do { if (substr($this->data, $this->position, 2) === "\x0D\x0A") { $this->position += 2; } elseif ($this->data[$this->position] === "\x0A") { $this->position++; } $this->position += strspn($this->data, "\x09\x20", $this->position); } while ($this->has_data() && $this->is_linear_whitespace()); $this->value .= "\x20"; } /** * See what state to move to while within non-quoted header values * @return void */ protected function value() { if ($this->is_linear_whitespace()) { $this->linear_whitespace(); } else { switch ($this->data[$this->position]) { case '"': // Workaround for ETags: we have to include the quotes as // part of the tag. if (strtolower($this->name) === 'etag') { $this->value .= '"'; $this->position++; $this->state = self::STATE_VALUE_CHAR; break; } $this->position++; $this->state = self::STATE_QUOTE; break; case "\x0A": $this->position++; $this->state = self::STATE_NEW_LINE; break; default: $this->state = self::STATE_VALUE_CHAR; break; } } } /** * Parse a header value while outside quotes * @return void */ protected function value_char() { $len = strcspn($this->data, "\x09\x20\x0A\"", $this->position); $this->value .= substr($this->data, $this->position, $len); $this->position += $len; $this->state = self::STATE_VALUE; } /** * See what state to move to while within quoted header values * @return void */ protected function quote() { if ($this->is_linear_whitespace()) { $this->linear_whitespace(); } else { switch ($this->data[$this->position]) { case '"': $this->position++; $this->state = self::STATE_VALUE; break; case "\x0A": $this->position++; $this->state = self::STATE_NEW_LINE; break; case '\\': $this->position++; $this->state = self::STATE_QUOTE_ESCAPED; break; default: $this->state = self::STATE_QUOTE_CHAR; break; } } } /** * Parse a header value while within quotes * @return void */ protected function quote_char() { $len = strcspn($this->data, "\x09\x20\x0A\"\\", $this->position); $this->value .= substr($this->data, $this->position, $len); $this->position += $len; $this->state = self::STATE_VALUE; } /** * Parse an escaped character within quotes * @return void */ protected function quote_escaped() { $this->value .= $this->data[$this->position]; $this->position++; $this->state = self::STATE_QUOTE; } /** * Parse the body * @return void */ protected function body() { $this->body = substr($this->data, $this->position); if (!empty($this->headers['transfer-encoding'])) { unset($this->headers['transfer-encoding']); $this->state = self::STATE_CHUNKED; } else { $this->state = self::STATE_EMIT; } } /** * Parsed a "Transfer-Encoding: chunked" body * @return void */ protected function chunked() { if (!preg_match('/^([0-9a-f]+)[^\r\n]*\r\n/i', trim($this->body))) { $this->state = self::STATE_EMIT; return; } $decoded = ''; $encoded = $this->body; while (true) { $is_chunked = (bool) preg_match('/^([0-9a-f]+)[^\r\n]*\r\n/i', $encoded, $matches); if (!$is_chunked) { // Looks like it's not chunked after all $this->state = self::STATE_EMIT; return; } $length = hexdec(trim($matches[1])); // For PHPStan: this will only be float when larger than PHP_INT_MAX. // But even on 32-bit systems, it would mean 2GiB chunk, which sounds unlikely. \assert(\is_int($length), "Length needs to be shorter than PHP_INT_MAX"); if ($length === 0) { // Ignore trailer headers $this->state = self::STATE_EMIT; $this->body = $decoded; return; } $chunk_length = strlen($matches[0]); $decoded .= substr($encoded, $chunk_length, $length); $encoded = substr($encoded, $chunk_length + $length + 2); // BC for PHP < 8.0: substr() can return bool instead of string $encoded = ($encoded === false) ? '' : $encoded; if (trim($encoded) === '0' || empty($encoded)) { $this->state = self::STATE_EMIT; $this->body = $decoded; return; } } } /** * Prepare headers (take care of proxies headers) * * @param string $headers Raw headers * @param non-negative-int $count Redirection count. Default to 1. * * @return string */ public static function prepareHeaders(string $headers, int $count = 1) { $data = explode("\r\n\r\n", $headers, $count); $data = array_pop($data); if (false !== stripos($data, "HTTP/1.0 200 Connection established\r\n")) { $exploded = explode("\r\n\r\n", $data, 2); $data = end($exploded); } if (false !== stripos($data, "HTTP/1.1 200 Connection established\r\n")) { $exploded = explode("\r\n\r\n", $data, 2); $data = end($exploded); } return $data; } } class_alias('SimplePie\HTTP\Parser', 'SimplePie_HTTP_Parser');
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