theluyuan
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82 lines
2.1 KiB
TypeScript
82 lines
2.1 KiB
TypeScript
import base64js from 'base64-js';
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import { timeoutPromise } from './timeoutPromise';
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/**
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* The number of milliseconds before deciding that we need retry a fetch request.
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*
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* @type {number}
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*/
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const RETRY_TIMEOUT = 3000;
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/**
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* Wrapper around fetch GET requests to handle json-ifying the response
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* and logging errors.
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*
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* @param {string} url - The URL to perform a GET against.
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* @param {?boolean} retry - Whether the request will be retried after short timeout.
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* @param {?Object} options - The request options.
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* @returns {Promise<Object>} The response body, in JSON format, will be
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* through the Promise.
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*/
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export function doGetJSON(url: string, retry?: boolean, options?: Object) {
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const fetchPromise = fetch(url, options)
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.then(response => {
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const jsonify = response.json();
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if (response.ok) {
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return jsonify;
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}
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return jsonify
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.then(result => Promise.reject(result));
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});
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if (retry) {
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return timeoutPromise(fetchPromise, RETRY_TIMEOUT)
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.catch(response => {
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if (response.status >= 400 && response.status < 500) {
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return Promise.reject(response);
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}
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return timeoutPromise(fetchPromise, RETRY_TIMEOUT);
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});
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}
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return fetchPromise;
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}
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/**
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* Encodes strings to Base64URL.
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*
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* @param {any} data - The byte array to encode.
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* @returns {string}
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*/
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export const encodeToBase64URL = (data: string): string => base64js
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.fromByteArray(new window.TextEncoder().encode(data))
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.replace(/=/g, '')
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.replace(/\+/g, '-')
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.replace(/\//g, '_');
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/**
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* Decodes strings from Base64URL.
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*
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* @param {string} data - The byte array to decode.
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* @returns {string}
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*/
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export const decodeFromBase64URL = (data: string): string => {
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let s = data;
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// Convert from Base64URL to Base64.
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if (s.length % 4 === 2) {
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s += '==';
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} else if (s.length % 4 === 3) {
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s += '=';
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}
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s = s.replace(/-/g, '+').replace(/_/g, '/');
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// Convert Base64 to a byte array.
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return new window.TextDecoder().decode(base64js.toByteArray(s));
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};
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