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index.ts
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index.ts
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import { IncomingMessage, ServerResponse } from "http";
export interface CrossOriginResourcePolicyOptions {
policy?: "same-origin" | "same-site" | "cross-origin";
}
const ALLOWED_POLICIES = new Set(["same-origin", "same-site", "cross-origin"]);
function getHeaderValueFromOptions({
policy = "same-origin",
}: Readonly<CrossOriginResourcePolicyOptions>): string {
if (ALLOWED_POLICIES.has(policy)) {
return policy;
} else {
throw new Error(
`Cross-Origin-Resource-Policy does not support the ${JSON.stringify(
policy
)} policy`
);
}
}
function crossOriginResourcePolicy(
options: Readonly<CrossOriginResourcePolicyOptions> = {}
) {
const headerValue = getHeaderValueFromOptions(options);
return function crossOriginResourcePolicyMiddleware(
_req: IncomingMessage,
res: ServerResponse,
next: () => void
) {
res.setHeader("Cross-Origin-Resource-Policy", headerValue);
next();
};
}
export default crossOriginResourcePolicy;