@httpland/coep-middleware
v1.0.0
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HTTP cross-origin embedder policy(COEP) middleware
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coep-middleware
HTTP cross-origin embedder policy(COEP) middleware.
Compliant with HTML Living Standard, 7.1.4 Cross-origin embedder policies.
Middleware
For a definition of Universal HTTP middleware, see the http-middleware project.
Usage
Middleware adds the Cross-Origin-Embedder-Policy
header to the response.
import {
coep,
type Handler,
} from "https://deno.land/x/coep_middleware@$VERSION/mod.ts";
import { assert } from "https://deno.land/std/testing/asserts.ts";
declare const request: Request;
declare const handler: Handler;
const middleware = coep();
const response = await middleware(request, handler);
assert(response.headers.has("cross-origin-embedder-policy"));
yield:
Cross-Origin-Embedder-Policy: require-corp
Options
The middleware factory accepts the following fields:
| Name | Type | Default | Description |
| ---------- | --------------------------------------------------------------- | :--------------: | ------------------------------------- |
| policy | "require-corp"
| "unsafe-none"
| credentialless
| "require-corp"
| Embedder policy value. |
| reportTo | string
| - | Reporting endpoint name. |
| reportOnly | boolean
| false
| Whether header is report-only or not. |
policy
If specified, change the embedder policy value.
import { coep } from "https://deno.land/x/coep_middleware@$VERSION/middleware.ts";
const middleware = coep({ policy: "credentialless" });
yield:
Cross-Origin-Embedder-Policy: credentialless
reportTo
If specified, adds a report-to
param to the output.
import { coep } from "https://deno.land/x/coep_middleware@$VERSION/middleware.ts";
const middleware = coep({ reportTo: "default" });
yield:
Cross-Origin-Embedder-Policy: require-corp;report-to=default
reportOnly
Depending on the value, the header will be:
| Value | Field name |
| ------- | ------------------------------------------ |
| true
| Cross-Origin-Embedder-Policy-Report-Only
|
| false
| Cross-Origin-Embedder-Policy
|
import { coep } from "https://deno.land/x/coep_middleware@$VERSION/middleware.ts";
const middleware = coep({ reportOnly: true });
yield:
Cross-Origin-Embedder-Policy-Report-Only: require-corp
Throwing error
If serialize of embedder policy fails, it may throw TypeError
.
Serialize fails in the following cases:
- If
reportTo
field is an invalid<sf-token>
syntax
import { coep } from "https://deno.land/x/coep_middleware@$VERSION/middleware.ts";
import { assertThrows } from "https://deno.land/std/testing/asserts.ts";
assertThrows(() => coep({ reportTo: "<invalid>" }));
Conditions
Middleware will execute if all of the following conditions are met:
- Response does not include
Cross-Origin-Embedder-Policy
header - Response does not include
Cross-Origin-Embedder-Policy-Report-Only
header
Effects
Middleware may make changes to the following elements of the HTTP message.
- HTTP Headers
- Cross-Origin-Embedder-Policy
- Cross-Origin-Embedder-Policy-Report-Only
API
All APIs can be found in the deno doc.
License
Copyright © 2023-present httpland.
Released under the MIT license