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headers.ts
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headers.ts
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/**
* Copyright 2023-present DreamNum Inc.
*
* 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:https://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.
*/
interface IHeadersConstructorProps {
[key: string]: string | number | boolean;
}
// Header keys in `HTTPHeaders` should be in lower case.
export const ApplicationJSONType = 'application/json';
/**
* It wraps headers of HTTP requests' and responses' headers.
*/
export class HTTPHeaders {
private readonly _headers: Map<string, string[]> = new Map();
constructor(headers?: IHeadersConstructorProps | Headers | string) {
if (typeof headers === 'string') {
this._handleHeadersString(headers);
} else if (headers instanceof Headers) {
this._handleHeaders(headers);
} else if (headers) {
this._handleHeadersConstructorProps(headers);
}
}
forEach(callback: (name: string, value: string[]) => void): void {
this._headers.forEach((v, key) => callback(key, v));
}
has(key: string): boolean {
return !!this._headers.has(key.toLowerCase());
}
get(key: string): string[] | null {
const k = key.toLowerCase();
return this._headers.has(k) ? this._headers.get(k)! : null;
}
toHeadersInit(): HeadersInit {
const headers: HeadersInit = {};
this._headers.forEach((values, key) => {
headers[key] = values.join(',');
});
headers.Accept ??= 'application/json, text/plain, */*';
return headers;
}
private _setHeader(name: string, value: string | number | boolean): void {
const lowerCase = name.toLowerCase();
if (this._headers.has(lowerCase)) {
this._headers.get(lowerCase)!.push(value.toString());
} else {
this._headers.set(lowerCase, [value.toString()]);
}
}
private _handleHeadersString(headers: string): void {
headers.split('\n').forEach((header) => {
const [name, value] = header.split(':');
if (name && value) {
this._setHeader(name, value);
}
});
}
private _handleHeadersConstructorProps(headers: IHeadersConstructorProps): void {
Object.keys(headers).forEach(([name, value]) => {
this._setHeader(name, value);
});
}
private _handleHeaders(headers: Headers): void {
headers.forEach((value, name) => {
this._setHeader(name, value);
});
}
}