/**
* (c) Copyright Ascensio System SIA 2025
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @license
*/
/**
* @module
* @mergeModuleWith util/fetch
*/
/* eslint-disable typescript/consistent-type-definitions */
import type * as context from "../context.ts"
export type ForwardingContextProvider = {
get(): context.Context | undefined
}
export function withForwarding(cp: ForwardingContextProvider, fetch: typeof globalThis.fetch): typeof globalThis.fetch {
return async(input, init) => {
let ctx = cp.get()
if (ctx && (ctx.forwardedFor || ctx.realIp)) {
if (!(input instanceof Request)) {
throw new Error(`Invalid input type "${typeof input}"`)
}
input = input.clone()
if (ctx.forwardedFor) {
input.headers.set("X-Forwarded-For", ctx.forwardedFor)
}
if (ctx.realIp) {
input.headers.set("X-Real-IP", ctx.realIp)
}
}
return await fetch(input, init)
}
}
