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<?php |
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|
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namespace IvyForms\Services\Payment; |
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|
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/** |
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* Appends payment-provider hosts to an existing Content-Security-Policy. |
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* |
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* A plugin must not emit a standalone CSP — that would lock the rest of the site. |
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*/ |
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class PaymentCspHeaders |
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{ |
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private const SOURCES = [ |
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'https://web.squarecdn.com', |
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'https://sandbox.web.squarecdn.com', |
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'https://pci-connect.squareup.com', |
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'https://pci-connect.squareupsandbox.com', |
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'https://connect.squareup.com', |
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'https://connect.squareupsandbox.com', |
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'https://js.stripe.com', |
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'https://hooks.stripe.com', |
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'https://api.stripe.com', |
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'https://www.paypal.com', |
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'https://www.sandbox.paypal.com', |
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'https://www.paypalobjects.com', |
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]; |
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|
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public static function register(): void |
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{ |
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add_filter('wp_headers', [self::class, 'appendSources']); |
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} |
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|
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/** |
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* @param array<string, mixed> $headers |
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* @return array<string, mixed> |
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*/ |
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public static function appendSources(array $headers): array |
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{ |
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$extra = implode(' ', self::SOURCES); |
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|
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foreach (['Content-Security-Policy', 'Content-Security-Policy-Report-Only'] as $name) { |
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if (empty($headers[$name]) || !is_string($headers[$name])) { |
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continue; |
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} |
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$headers[$name] = self::appendToPolicy($headers[$name], $extra); |
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} |
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|
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return $headers; |
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} |
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|
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private static function appendToPolicy(string $policy, string $extra): string |
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{ |
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foreach (['script-src', 'frame-src', 'connect-src', 'child-src'] as $directive) { |
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if (!preg_match('/' . preg_quote($directive, '/') . '\s/i', $policy)) { |
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continue; |
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} |
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$policy = preg_replace( |
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'/' . preg_quote($directive, '/') . '\s([^;]*)/i', |
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$directive . ' $1 ' . $extra, |
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$policy, |
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1 |
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) ?? $policy; |
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} |
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|
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return $policy; |
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} |
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} |
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|
