HttpRequest

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HttpRequest for any type of request and HttpRequestHTML to request webpage. Supports caching of responses to handle status 304.

当前为 2020-06-13 提交的版本，查看最新版本。

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/405144/815926/HttpRequest.js

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换行

// ==UserScript==
// @name         HttpRequest
// @namespace    hoehleg.userscripts.private
// @version      0.1
// @description  HttpRequest for any type of request and HttpRequestHTML to request webpage. Supports caching of responses to handle status 304.
// @author       Gerrit Höhle
//
// @grant        GM_xmlhttpRequest
//
// @require      http://greasyfork.icu/scripts/405143-simplecache/code/SimpleCache.js
// @require      http://greasyfork.icu/scripts/405144-httprequest/code/HttpRequest.js
//
// @require      https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js
//
// ==/UserScript==

/* jshint esnext: true */
/* globals globals $, jQuery, SimpleCache */
const HttpRequest = (() => {
    const responsesCache = new SimpleCache({ keyExtractor: (httpRequest) => [ httpRequest.method, httpRequest.url, httpRequest.headers, httpRequest.data, httpRequest.params ].join() });

    const urlWithParams = (url, paramsObject) => {
        const params = Object.entries(paramsObject).map(([key, value]) => key + '=' + value).join('&');
        return (url.length > 0) ? url + '?' + params : params;
    };

    return class HttpRequest {
        constructor({ method, url = window.location.href, onLoad = () => {}, onError = () => {}, headers = '', data = '', keepInCacheTimoutMs = 10 * 60000, params = {} } = {}) {
            Object.assign(this, { method, url, onLoad, onError, headers, data, keepInCacheTimoutMs, params });
        }

        send() {
            const method = this.method.toUpperCase();
            let url = this.url;
            let headers = this.headers;
            let data = this.data;
            const onload = (response) => {
                switch (response.status) {
                    case 200:
                        if (this.keepInCacheTimoutMs > 0) {
                            responsesCache.set(this, response, this.keepInCacheTimoutMs);
                        }
                        break;
                    case 304:
                        if (this.isCached()) {
                            response = this.getFromCache();
                            response.status = 304;
                        }
                        break;
                    default:
                        this.onError(response);
                        return;
                }
                this.onLoad(response);
            };
            const onerror = this.onError;

            switch (method) {
                case 'GET':
                    if (this.params) {
                        url = urlWithParams(url, this.params);
                    }
                    break;
                case 'POST':
                case 'PUT':
                    Object.assign(headers, { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8' });
                    if (this.params) {
                        data = urlWithParams(data, this.params);
                    }
                    break;
            }

            return GM_xmlhttpRequest({ method, url, onload, onerror: this.onError, headers: this.headers, data });
        }

        isCached() {
            return responsesCache.has(this);
        }

        getFromCache() {
            return responsesCache.get(this);
        }
    };
})();

class HttpRequestHtml extends HttpRequest {
    constructor({ url, method = "GET", onSuccess = () => {}, onError, headers, data, keepInCacheTimoutMs } = {}) {
        super({ method, url, onError, headers, data, keepInCacheTimoutMs });

        Object.defineProperty(this, 'onLoad', {
            value: (response) => {
                if (response.status == 200) {
                    response.responseHtml = new DOMParser().parseFromString(response.responseText, 'text/html');
                    this.onSuccess(response);
                }
            },
            enumerable: true
        });

        this.onSuccess = onSuccess;
    }
}