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UTILS_FETCH Library

fetch library

Verzia zo dňa 08.03.2025. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://updategreasyfork.deno.dev/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,
        };
    })();
})();