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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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// Google says (https://developers.google.com/search/reference/robots_txt) : |
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// Only one group of group-member records is valid for a particular crawler. |
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// The crawler must determine the correct group of records by finding the group |
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// with the most specific user-agent that still matches. |
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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($url, PHP_URL_PATH) ?? ''; |
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if ($userAgent != '*' && isset($this->disallowsPerUserAgent[$userAgent])) { |
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return ! $this->pathIsDenied($path, $this->disallowsPerUserAgent[$userAgent]) ?? true; |
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} elseif ($userAgent != '*' && $wildCardUserAgent = $this->getWildCardUserAgent($userAgent)) { |
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return ! $this->pathIsDenied($path, $this->disallowsPerUserAgent[$wildCardUserAgent]) ?? true; |
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} elseif (isset($this->disallowsPerUserAgent['*'])) { |
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return ! $this->pathIsDenied($path, $this->disallowsPerUserAgent['*']) ?? true; |
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} |
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return true; |
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} |
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protected function getWildCardUserAgent(string $userAgent): ?string |
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{ |
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$wildcardUserAgents = array_filter(array_keys($this->disallowsPerUserAgent), function ($userAgent) { |
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return $userAgent != '*' && strpos($userAgent, '*') !== false; |
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}); |
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foreach ($wildcardUserAgents as $wildcardUserAgent) { |
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if (strpos($userAgent, substr($wildcardUserAgent, 0, -1)) === 0) { |
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return $wildcardUserAgent; |
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} |
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} |
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return null; |
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} |
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protected function pathIsDenied(string $path, array $rules) |
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{ |
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foreach ($rules as $pattern => $rule) { |
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if ($this->match($pattern, $path)) { |
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return $rule; |
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} |
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} |
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} |
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protected function match($pattern, $string) |
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{ |
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$pattern = preg_quote($pattern, '/'); |
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$pattern = str_replace('\*', '.*', $pattern); |
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$pattern = substr($pattern, -2) == '\$' ? substr($pattern, 0, strlen($pattern) - 2).'$' : $pattern; |
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$pattern = preg_replace('/\/$/', '/?', $pattern); |
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return (bool) preg_match('/^'.$pattern.'/', $string); |
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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 ($currentUserAgent === null) { |
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continue; |
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} |
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list($pattern, $rule) = $this->parse($line); |
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if ($pattern !== null) { // other than allow/disallow |
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$currentUserAgent[$pattern] = $rule; |
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} |
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} |
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return $this->orderRules($disallowsPerUserAgent); |
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} |
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// Google says (https://developers.google.com/search/reference/robots_txt) : |
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// At a group-member level, in particular for allow and disallow directives, the most specific rule |
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// based on the length of the [path] entry will trump the less specific (shorter) rule. The order of |
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// precedence for rules with wildcards is undefined. |
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protected function orderRules(array $disallowsPerUserAgent): array |
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{ |
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foreach ($disallowsPerUserAgent as $userAgent => $rules) { |
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array_multisort(array_map('strlen', array_keys($rules)), SORT_DESC, $rules); |
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$disallowsPerUserAgent[$userAgent] = $rules; |
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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 stripos(str_replace(' ', '', $line), 'user-agent:') === 0; |
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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 $line): ?array |
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{ |
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$line = trim(preg_replace('/\s+!/', ':', $line)); |
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if (stripos($line, 'disallow:') === 0) { |
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return [trim(preg_replace('/^disallow:/i', '', $line)), true]; |
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} |
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if (stripos($line, 'allow:') === 0) { |
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return [trim(preg_replace('/^allow:/i', '', $line)), false]; |
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} |
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return null; // 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
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