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middleware.ts
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middleware.ts
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// Copyright 2023-latest the httpland authors. All rights reserved. MIT license.
// This module is browser compatible.
import { Handler, Middleware, withHeader } from "./deps.ts";
import { Directive, Header } from "./constants.ts";
/** Create `X-Content-Type-Options` header middleware.
*
* Add `X-Content-Type-Options` header field to `Response`.
* ```http
* X-Content-Type-Options: nosniff
* ```
*
* @example
* ```ts
* import {
* type Handler,
* xcto,
* } from "https://deno.land/x/xcto_middleware@$VERSION/mod.ts";
* import { assert } from "https://deno.land/std/testing/asserts.ts";
*
* declare const request: Request;
* declare const handler: Handler;
*
* const middleware = xcto();
* const response = await middleware(request, handler);
*
* assert(response.headers.has("x-content-type-options"));
* ```
*/
export function xcto(): Middleware {
return xctoMiddleware;
}
export async function xctoMiddleware(
request: Request,
next: Handler,
): Promise<Response> {
const response = await next(request);
if (response.headers.has(Header.XContentTypeOptions)) return response;
return withHeader(response, Header.XContentTypeOptions, Directive.Nosniff);
}