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index.ts
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index.ts
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import { IncomingMessage, ServerResponse } from "http";
export interface XPermittedCrossDomainPoliciesOptions {
permittedPolicies?: "none" | "master-only" | "by-content-type" | "all";
}
const ALLOWED_PERMITTED_POLICIES = new Set([
"none",
"master-only",
"by-content-type",
"all",
]);
function getHeaderValueFromOptions({
permittedPolicies = "none",
}: Readonly<XPermittedCrossDomainPoliciesOptions>): string {
if (ALLOWED_PERMITTED_POLICIES.has(permittedPolicies)) {
return permittedPolicies;
} else {
throw new Error(
`X-Permitted-Cross-Domain-Policies does not support ${JSON.stringify(
permittedPolicies
)}`
);
}
}
function xPermittedCrossDomainPolicies(
options: Readonly<XPermittedCrossDomainPoliciesOptions> = {}
) {
const headerValue = getHeaderValueFromOptions(options);
return function xPermittedCrossDomainPoliciesMiddleware(
_req: IncomingMessage,
res: ServerResponse,
next: () => void
) {
res.setHeader("X-Permitted-Cross-Domain-Policies", headerValue);
next();
};
}
export default xPermittedCrossDomainPolicies;