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<?php
namespace Spatie\Robots;
class RobotsTxt
{
protected static array $robotsCache = [];
protected array $disallowsPerUserAgent = [];
protected array $allowsPerUserAgent = [];
protected bool $matchExactly = true;
protected bool $includeGlobalGroup = true;
public function ignoreGlobalGroup(): self
{
$this->includeGlobalGroup = false;
return $this;
}
public function includeGlobalGroup(): self
{
$this->includeGlobalGroup = true;
return $this;
}
public function withPartialMatches(): self
{
$this->matchExactly = false;
return $this;
}
public function exactMatchesOnly(): self
{
$this->matchExactly = true;
return $this;
}
public static function readFrom(string $source): self
{
$content = @file_get_contents($source);
return new self($content !== false ? $content : '');
}
public function __construct(string $content)
{
$this->disallowsPerUserAgent = $this->getDisallowsPerUserAgent($content);
$this->allowsPerUserAgent = $this->getAllowsPerUserAgent($content);
}
public static function create(string $source): self
{
if (
strpos($source, 'http') !== false
&& strpos($source, 'robots.txt') !== false
) {
return self::readFrom($source);
}
return new self($source);
}
public function allows(string $url, ?string $userAgent = '*'): bool
{
$requestUri = '';
$parts = parse_url($url);
if ($parts !== false) {
if (isset($parts['path'])) {
$requestUri .= $parts['path'];
}
if (isset($parts['query'])) {
$requestUri .= '?'.$parts['query'];
} elseif ($this->hasEmptyQueryString($url)) {
$requestUri .= '?';
}
}
$disallowsPerUserAgent = $this->includeGlobalGroup
? $this->disallowsPerUserAgent
: array_filter($this->disallowsPerUserAgent, fn ($key) => $key !== '*', ARRAY_FILTER_USE_KEY);
$allowsPerUserAgent = $this->includeGlobalGroup
? $this->allowsPerUserAgent
: array_filter($this->allowsPerUserAgent, fn ($key) => $key !== '*', ARRAY_FILTER_USE_KEY);
$normalizedUserAgent = strtolower(trim($userAgent ?? ''));
$disallows = $this->matchExactly
? $this->getDisallowsExactly($normalizedUserAgent, $disallowsPerUserAgent)
: $this->getDisallowsContaining($normalizedUserAgent, $disallowsPerUserAgent);
$allows = $this->matchExactly
? $this->getDisallowsExactly($normalizedUserAgent, $allowsPerUserAgent)
: $this->getDisallowsContaining($normalizedUserAgent, $allowsPerUserAgent);
if ($this->pathIsExplicitAllowed($url, $allows)) {
return true;
}
$isDenied = $this->pathIsDenied($requestUri, $disallows);
if ($isDenied) {
$isAllowedWeight = $this->pathMatchWeight($requestUri, $allows);
if ($isAllowedWeight === 0) {
return false;
}
$isDisallowedWeight = $this->pathMatchWeight($requestUri, $disallows);
return $isAllowedWeight > $isDisallowedWeight;
}
return ! $isDenied;
}
protected function pathMatchWeight(string $requestUri, array $itemsPerUseragent): int
{
$weight = 0;
foreach ($itemsPerUseragent as $item => $strlen) {
$startsWith = str_starts_with($requestUri, $item);
if ($startsWith && $strlen > $weight) {
$weight = (int) $strlen;
}
}
return $weight;
}
protected function getDisallowsExactly(string $userAgent, array $disallowsPerUserAgent): array
{
return $disallowsPerUserAgent[$userAgent] ?? $disallowsPerUserAgent['*'] ?? [];
}
protected function getDisallowsContaining(string $userAgent, array $disallowsPerUserAgent): array
{
$disallows = [];
foreach ($disallowsPerUserAgent as $userAgentKey => $disallowsPerUserAgentKey) {
$contains = strpos($userAgent, $userAgentKey) !== false;
if ($contains || $userAgentKey === '*') {
$disallows = [...$disallows, ...$disallowsPerUserAgentKey];
}
}
return $disallows;
}
protected function pathIsExplicitAllowed(string $requestUri, array $allows): bool
{
return in_array($requestUri, array_keys($allows));
}
protected function pathIsDenied(string $requestUri, array $disallows): bool
{
foreach ($disallows as $disallow => $value) {
if ($disallow === '') {
continue;
}
$stopAtEndOfString = false;
if ($disallow[-1] === '$') {
// if the pattern ends with a dollar sign, the string must end there
$disallow = substr($disallow, 0, -1);
$stopAtEndOfString = true;
}
// convert to regexp
$disallowRegexp = preg_quote($disallow, '/');
// the pattern must start at the beginning of the string...
$disallowRegexp = '^'.$disallowRegexp;
// ...and optionally stop at the end of the string
if ($stopAtEndOfString) {
$disallowRegexp .= '$';
}
// replace (preg_quote'd) stars with an eager match
$disallowRegexp = str_replace('\\*', '.*', $disallowRegexp);
// enclose in delimiters
$disallowRegexp = '/'.$disallowRegexp.'/';
if (preg_match($disallowRegexp, $requestUri) === 1) {
return true;
}
}
return false;
}
/**
* Checks for an empty query string.
*
* This works around the fact that parse_url() will not set the 'query' key when the query string is empty.
* See: https://bugs.php.net/bug.php?id=78385
*/
protected function hasEmptyQueryString(string $url): bool
{
if ($url === '') {
return false;
}
if ($url[-1] === '?') { // ends with ?
return true;
}
if (strpos($url, '?#') !== false) { // empty query string, followed by a fragment
return true;
}
return false;
}
protected function getDisallowsPerUserAgent(string $content): array
{
$lines = explode(PHP_EOL, $content);
$lines = array_filter($lines);
$disallowsPerUserAgent = [];
$currentUserAgents = [];
$treatAllowDisallowLine = false;
foreach ($lines as $line) {
if ($this->isComment($line)) {
continue;
}
if ($this->isEmptyLine($line)) {
continue;
}
if ($this->isUserAgentLine($line)) {
if ($treatAllowDisallowLine) {
$treatAllowDisallowLine = false;
$currentUserAgents = [];
}
$disallowsPerUserAgent[$this->parseUserAgent($line)] = [];
$currentUserAgents[] = &$disallowsPerUserAgent[$this->parseUserAgent($line)];
continue;
}
if ($this->isDisallowLine($line)) {
$treatAllowDisallowLine = true;
}
if ($this->isAllowLine($line)) {
$treatAllowDisallowLine = true;
continue;
}
$disallowUrl = $this->parseDisallow($line);
foreach ($currentUserAgents as &$currentUserAgent) {
$currentUserAgent[$disallowUrl] = strlen($disallowUrl);
}
}
return $disallowsPerUserAgent;
}
protected function getAllowsPerUserAgent(string $content): array
{
$lines = explode(PHP_EOL, $content);
$lines = array_filter($lines);
$allowsPerUserAgent = [];
$currentUserAgents = [];
$treatAllowDisallowLine = false;
foreach ($lines as $line) {
if ($this->isComment($line)) {
continue;
}
if ($this->isEmptyLine($line)) {
continue;
}
if ($this->isUserAgentLine($line)) {
if ($treatAllowDisallowLine) {
$treatAllowDisallowLine = false;
$currentUserAgents = [];
}
$allowsPerUserAgent[$this->parseUserAgent($line)] = [];
$currentUserAgents[] = &$allowsPerUserAgent[$this->parseUserAgent($line)];
continue;
}
if ($this->isDisallowLine($line)) {
$treatAllowDisallowLine = true;
continue;
}
if ($this->isAllowLine($line)) {
$treatAllowDisallowLine = true;
}
$allowUrl = $this->parseAllow($line);
foreach ($currentUserAgents as &$currentUserAgent) {
$currentUserAgent[$allowUrl] = strlen($allowUrl);
}
}
$allowsPerUserAgent = array_filter($allowsPerUserAgent, function ($item) {
return count($item) > 0;
});
return $allowsPerUserAgent;
}
protected function isComment(string $line): bool
{
return strpos(trim($line), '#') === 0;
}
protected function isEmptyLine(string $line): bool
{
return trim($line) === '';
}
protected function isUserAgentLine(string $line): bool
{
return strpos(trim(strtolower($line)), 'user-agent') === 0;
}
protected function parseUserAgent(string $line): string
{
return trim(str_replace('user-agent', '', strtolower(trim($line))), ': ');
}
protected function parseDisallow(string $line): string
{
return trim(substr_replace(trim($line), '', 0, 8), ': ');
}
protected function parseAllow(string $line): string
{
return trim(substr_replace(trim($line), '', 0, 6), ': ');
}
protected function isDisallowLine(string $line): string
{
return trim(substr(str_replace(' ', '', strtolower(trim($line))), 0, 8), ': ') === 'disallow';
}
protected function isAllowLine(string $line): string
{
return trim(substr(str_replace(' ', '', strtolower(trim($line))), 0, 6), ': ') === 'allow';
}
}