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headers.ts
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headers.ts
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/*
* Licensed to Elasticsearch B.V. under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch B.V. licenses this file to you 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.
*/
import { pick } from '../../../utils';
/** @public */
export type Headers = Record<string, string | string[] | undefined>;
const normalizeHeaderField = (field: string) => field.trim().toLowerCase();
export function filterHeaders(
headers: Headers,
fieldsToKeep: string[],
fieldsToExclude: string[] = []
) {
const fieldsToExcludeNormalized = fieldsToExclude.map(normalizeHeaderField);
// Normalize list of headers we want to allow in upstream request
const fieldsToKeepNormalized = fieldsToKeep
.map(normalizeHeaderField)
.filter(name => !fieldsToExcludeNormalized.includes(name));
return pick(headers, fieldsToKeepNormalized);
}