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<?php |
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namespace Spatie\Robots; |
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use InvalidArgumentException; |
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class RobotsHeaders |
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{ |
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protected $robotHeadersProperties = []; |
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public static function readFrom(string $source): self |
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{ |
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$content = @file_get_contents($source); |
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if ($content === false) { |
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throw new InvalidArgumentException("Could not read from source `{$source}`"); |
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} |
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return new self($http_response_header ?? []); |
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} |
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public static function create(array $headers): self |
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{ |
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return new self($headers); |
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} |
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public function __construct(array $headers) |
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{ |
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$this->robotHeadersProperties = $this->parseHeaders($headers); |
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} |
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public function mayIndex(string $userAgent = '*'): bool |
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{ |
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return ! $this->noindex($userAgent); |
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} |
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public function mayFollow(string $userAgent = '*'): bool |
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{ |
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return ! $this->nofollow($userAgent); |
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} |
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public function noindex(string $userAgent = '*'): bool |
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{ |
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$userAgent = strtolower($userAgent); |
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return |
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$this->robotHeadersProperties[$userAgent]['noindex'] |
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?? $this->robotHeadersProperties[$this->getWildCardUserAgent($userAgent)]['noindex'] |
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?? $this->robotHeadersProperties['*']['noindex'] |
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?? false; |
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} |
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public function nofollow(string $userAgent = '*'): bool |
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{ |
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$userAgent = strtolower($userAgent); |
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return |
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$this->robotHeadersProperties[$userAgent]['nofollow'] |
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?? $this->robotHeadersProperties[$this->getWildCardUserAgent($userAgent)]['nofollow'] |
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?? $this->robotHeadersProperties['*']['nofollow'] |
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?? false; |
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} |
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protected function getWildCardUserAgent(string $userAgent): ?string |
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{ |
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if ($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->robotHeadersProperties[$wildCardUserAgent])) { |
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return $wildCardUserAgent; |
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} |
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} |
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} |
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return null; |
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} |
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protected function parseHeaders(array $headers): array |
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{ |
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$robotHeaders = $this->filterRobotHeaders($headers); |
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return array_reduce($robotHeaders, function (array $parsedHeaders, $header) { |
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$header = $this->normalizeHeaders($header); |
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$headerParts = explode(':', $header); |
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$userAgent = count($headerParts) === 3 |
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? trim($headerParts[1]) |
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: '*'; |
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$userAgent = strtolower($userAgent); |
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$options = end($headerParts); |
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$parsedHeaders[$userAgent] = []; |
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if (strpos(strtolower($options), 'index')) { |
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$parsedHeaders[$userAgent]['noindex'] = strpos(strtolower($options), 'noindex') !== false; |
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} |
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if (strpos(strtolower($options), 'follow')) { |
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$parsedHeaders[$userAgent]['nofollow'] = strpos(strtolower($options), 'nofollow') !== false; |
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} |
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return $parsedHeaders; |
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}, []); |
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} |
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protected function filterRobotHeaders(array $headers): array |
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{ |
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return array_filter($headers, function ($header) use ($headers) { |
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$headerContent = $this->normalizeHeaders($headers[$header] ?? []); |
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return strpos(strtolower($header), 'x-robots-tag') === 0 |
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|| strpos(strtolower($headerContent), 'x-robots-tag') === 0; |
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}, ARRAY_FILTER_USE_KEY); |
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} |
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protected function normalizeHeaders($headers): string |
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{ |
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return implode(',', (array) $headers); |
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} |
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} |
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spatie /
robots-txt
