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<?php |
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namespace Spatie\Csp\Policies; |
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use Spatie\Csp\Value; |
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use Spatie\Csp\Directive; |
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use Illuminate\Http\Request; |
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use Spatie\Csp\Exceptions\InvalidDirective; |
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use Symfony\Component\HttpFoundation\Response; |
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abstract class Policy |
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{ |
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protected $directives = []; |
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protected $reportOnly = false; |
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abstract public function configure(); |
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/** |
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* @param string $directive |
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* @param string|array $values |
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* |
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* @return \Spatie\Csp\Policies\Policy |
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* |
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* @throws \Spatie\Csp\Exceptions\InvalidDirective |
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*/ |
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public function addDirective(string $directive, $values): self |
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{ |
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$this->guardAgainstInvalidDirectives($directive); |
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$rules = array_flatten(array_map(function ($values) { |
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return array_filter(explode(' ', $values), function ($value) { |
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return !empty($value); |
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}); |
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}, array_wrap($values))); |
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foreach ($rules as $rule) { |
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$sanitizedValue = $this->sanitizeValue($rule); |
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if (! in_array($sanitizedValue, $this->directives[$directive] ?? [])) { |
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$this->directives[$directive][] = $sanitizedValue; |
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} |
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} |
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return $this; |
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} |
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public function reportOnly(): self |
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{ |
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$this->reportOnly = true; |
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return $this; |
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} |
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public function enforce(): self |
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{ |
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$this->reportOnly = false; |
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return $this; |
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} |
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public function reportTo(string $uri): self |
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{ |
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$this->directives['report-uri'] = [$uri]; |
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return $this; |
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} |
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public function shouldBeApplied(Request $request, Response $response): bool |
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{ |
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return config('csp.enabled'); |
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} |
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public function addNonceForDirective(string $directive): self |
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{ |
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return $this->addDirective($directive, "'nonce-".app('csp-nonce')."'"); |
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} |
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public function applyTo(Response $response) |
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{ |
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$this->configure(); |
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$headerName = $this->reportOnly |
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? 'Content-Security-Policy-Report-Only' |
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: 'Content-Security-Policy'; |
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if ($response->headers->has($headerName)) { |
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return; |
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} |
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$response->headers->set($headerName, (string) $this); |
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} |
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public function __toString() |
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{ |
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return collect($this->directives) |
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->map(function (array $values, string $directive) { |
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$valueString = implode(' ', $values); |
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return "{$directive} {$valueString}"; |
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}) |
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->implode(';'); |
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} |
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protected function guardAgainstInvalidDirectives(string $directive) |
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{ |
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if (! Directive::isValid($directive)) { |
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throw InvalidDirective::notSupported($directive); |
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} |
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} |
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protected function isHash(string $value): bool |
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{ |
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$acceptableHashingAlgorithms = [ |
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'sha256', |
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'sha384', |
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'sha512', |
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]; |
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return in_array(explode('-', $value)[0], $acceptableHashingAlgorithms); |
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} |
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protected function sanitizeValue(string $value): string |
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{ |
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$specialDirectiveValues = [ |
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Value::NONE, |
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Value::REPORT_SAMPLE, |
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Value::SELF, |
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Value::STRICT_DYNAMIC, |
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Value::UNSAFE_EVAL, |
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Value::UNSAFE_INLINE, |
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]; |
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if (in_array($value, $specialDirectiveValues) || $this->isHash($value)) { |
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return "'{$value}'"; |
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} |
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return $value; |
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} |
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} |
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spatie /
laravel-csp
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This check looks from parameters that have been defined for a function or method, but which are not used in the method body.