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<?php |
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namespace Spatie\Robots; |
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class RobotsTxt |
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{ |
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protected static $robotsCache = []; |
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protected $disallowsPerUserAgent = []; |
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public static function readFrom(string $source): self |
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{ |
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$content = @file_get_contents($source) ?? ''; |
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return new self($content); |
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} |
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public function __construct(string $content) |
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{ |
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$this->disallowsPerUserAgent = $this->getDisallowsPerUserAgent($content); |
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} |
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public static function create(string $source): self |
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{ |
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if ( |
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strpos($source, 'http') !== false |
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&& strpos($source, 'robots.txt') !== false |
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) { |
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return self::readFrom($source); |
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} |
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return new self($source); |
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} |
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public function allows(string $url, ?string $userAgent = '*'): bool |
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{ |
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$userAgent = strtolower($userAgent); |
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if ($userAgent === null) { |
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$userAgent = '*'; |
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} |
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$path = parse_url($url, PHP_URL_PATH) ?? ''; |
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$disallows = $this->disallowsPerUserAgent[$userAgent] ?? []; |
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// check for exact |
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$type = null; |
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if ($return = $this->pathIsDenied($path, $disallows, $type) !== null) { |
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// if it's in a dir, maybe wildcard authorize or forbid it |
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if ($type === 1 && $wildCardReturn = $this->checkForWildcard($url, $userAgent) !== null) { |
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return $wildCardReturn; |
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} |
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// if it's in a dir but wildcard forbid access |
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if ($type === 1 && $wildCardReturn = $this->pathIsDenied($path, $disallows) !== null) { |
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if ($wildCardReturn === true) { |
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return false; |
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} |
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} |
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return ! $return; |
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} |
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// check for wildcrad user agent |
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if ($return = $this->checkForWildcard($url, $userAgent) !== null) { |
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return $return; |
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} |
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// check for wildcard |
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if ($return = $this->pathIsDenied($path, $disallows) !== null) { |
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return ! $return; |
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} |
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return true; |
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} |
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protected function checkForWildcard(string $path, string $userAgent) |
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{ |
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if ($userAgent !== '*') { |
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for ($i = 1; $i <= strlen($userAgent); $i++) { |
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$wildCardUserAgent = substr($userAgent, 0, $i).'*'; |
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if (isset($this->disallowsPerUserAgent[$wildCardUserAgent])) { |
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return ! $this->pathIsDenied($path, $this->disallowsPerUserAgent[$wildCardUserAgent]); |
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} |
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} |
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} |
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} |
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protected function pathIsDenied(string $path, array $rules, &$type = null) |
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{ |
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foreach ($rules as $uri => $rule) { |
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$trimUri = rtrim($uri, '/'); |
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if (in_array($path, [$uri, $trimUri])) { |
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$type = 0; |
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return $rule; |
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} |
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if ($this->isUrlInDirectory($path, $uri)) { |
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$type = 1; |
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return $rule; |
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} |
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} |
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} |
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protected function getDisallowsPerUserAgent(string $content): array |
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{ |
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$lines = explode(PHP_EOL, $content); |
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$lines = array_filter($lines); |
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$disallowsPerUserAgent = []; |
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$currentUserAgent = null; |
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foreach ($lines as $line) { |
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if ($this->isUserAgentLine($line)) { |
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$disallowsPerUserAgent[$this->parseUserAgent($line)] = []; |
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$currentUserAgent = &$disallowsPerUserAgent[$this->parseUserAgent($line)]; |
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continue; |
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} |
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if ($currentUserAgent === null) { |
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continue; |
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} |
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$rule = null; |
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$disallowUrl = $this->parse($line, $rule); |
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if ($disallowUrl !== null) { // other than allow/disallow |
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$currentUserAgent[$disallowUrl] = $rule; |
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} |
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} |
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return $disallowsPerUserAgent; |
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} |
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protected function isUserAgentLine(string $line): bool |
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{ |
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return preg_match('/^User-agent\s*:/i', trim($line)); |
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} |
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protected function parseUserAgent(string $line): string |
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{ |
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return strtolower(trim(preg_replace('/^User-agent\s*:/i', '', trim($line)))); |
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} |
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protected function parse(string $line, &$type): ?string |
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{ |
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$line = trim(preg_replace('/\s+!/', ':', $line)); |
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if (stripos($line, 'disallow:') === 0) { |
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$type = true; |
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return trim(preg_replace('/^disallow:/i', '', $line)); |
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} |
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if (stripos($line, 'allow:') === 0) { |
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$type = false; |
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return trim(preg_replace('/^allow:/i', '', $line)); |
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} |
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// else: could be crawl-delay, sitemap... |
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} |
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protected function isUrlInDirectory(string $url, string $path): bool |
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{ |
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return strpos($url, $path) === 0; |
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} |
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} |
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spatie /
robots-txt
