fetch library
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/528458/1549748/UTILS_FETCH%20Library.js
// ==UserScript==
// @name UTILS_FETCH Library
// @namespace dannysaurus.epik
// @version 1.0
// @description fetch library
//
// @license MIT
// @grant GM_xmlhttpRequest
// @grant GM.getValue
// @grant GM.setValue
// @grant unsafeWindow
// ==/UserScript==
/* jslint esversion: 11 */
/* global unsafeWindow */
(() => {
'use strict';
unsafeWindow.dannysaurus_epik ??= {};
unsafeWindow.dannysaurus_epik.libraries ??= {};
unsafeWindow.dannysaurus_epik.libraries.UTILS_FETCH = (() => {
/**
* General fetch method using GM_xmlhttpRequest.
*
* @param {string} url - The URL to fetch the data from.
* @param {string} [method='GET'] - The HTTP method to use for the request.
* @returns {Promise<Response>} The fetched response.
* @throws {Error} If there is an error fetching the data.
*/
const fetch = async (url, method = 'GET') => {
return new Promise((resolve, reject) => GM_xmlhttpRequest({
method: method,
url: url,
onload: (response) => {
if (response.status >= 200 && response.status < 300) {
resolve(response);
} else {
console.error('HTTP error! status:', response.status);
reject(new Error(`HTTP error! status: ${response.status}`));
}
},
onerror: (error) => {
console.error('Request error:', error);
reject(error);
}
}));
};
/**
* Fetches JSON data from the specified URL.
*
* @param {string} url - The URL to fetch the JSON data from.
* @param {string} [method='GET'] - The HTTP method to use for the request.
* @returns {Promise<Object>} The fetched JSON data.
* @throws {Error} If there is an error fetching or parsing the JSON data.
*/
const fetchJSON = async (url, method = 'GET') => {
const response = await fetch(url, method);
try {
return JSON.parse(response.responseText);
} catch (error) {
console.error('Error parsing JSON:', error);
throw error;
}
};
/**
* Fetches the names of accepted users from the users - JSON.
*
* @param {Object} options
* @param {string} [options.url] - The URL to fetch the JSON data from.
* @param {string} [options.localStorageId] - The ID to store the fetched JSON data in the local storage.
* @param {number} [options.delayMs] - The delay in milliseconds to wait before fetching the data again.
*
* @returns {Promise<Object>} fetched JSON data.
*/
const fetchJsonWithStorageCache = (() => {
const cacheByUrl = {};
return async ({ url, localStorageId, delayMs } = {}) => {
localStorageId = localStorageId.replace(/\s/g, '');
const cache = cacheByUrl[url] ??= {
jsonData: null,
timestamp: 0,
};
let fetchedJsonData = null;
if (cache.jsonData === null || Date.now() - cache.timestamp >= delayMs) {
try {
fetchedJsonData = await fetchJSON(url);
const propertyNamesCached = Object.keys(cache.jsonData || {});
const propertyNamesFetched = Object.keys(fetchedJsonData || {});
if (propertyNamesCached.length !== propertyNamesFetched.length
|| propertyNamesCached.some(propName => propertyNamesCached[propName] !== propertyNamesFetched[propName])
) {
try {
await GM.setValue(localStorageId, fetchedJsonData);
} catch (storageError) {
console.error(`Error saving json data to local storage:`, storageError);
}
}
} catch (error) {
try {
fetchedJsonData = await GM.getValue(localStorageId, null);
} catch (storageError) {
console.error(`Error loading ${localStorageId} from local storage:`, storageError);
}
}
if (fetchedJsonData) {
cache.jsonData = fetchedJsonData;
}
cache.timestamp = Date.now();
}
return cache.jsonData || {};
};
})();
return {
fetch,
fetchJSON,
fetchJsonWithStorageCache,
};
})();
})();