102 lines
3.3 KiB
JavaScript
102 lines
3.3 KiB
JavaScript
 
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// 主世界钩子(document_start):被动观察页面自己发出的请求,把命中的响应体副本
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// postMessage 给 content.js。参照 FetchV / 猫抓一类捕获扩展的通行模式。
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//
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// 铁律:只观察,不改写请求与响应;任何异常都必须静默,绝不能影响页面本身。
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(() => {
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"use strict";
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const MARKER = "__hexi_bf2042_capture__";
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const API_PREFIX =
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"https://api.tracker.gg/api/v2/bf2042/standard/profile/";
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function match(url) {
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return typeof url === "string" && url.startsWith(API_PREFIX);
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}
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function report(url, status, body) {
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try {
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window.postMessage({ [MARKER]: true, url, status, body }, "*");
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} catch (_) {
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/* 忽略:上报失败不能影响页面 */
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}
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}
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// ---- fetch ----
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// 用 Proxy 包一层:Function.prototype.toString.call() 显示为 native
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// (Proxy 的 target 是原生函数),比"改写后补 toString"更难被识破。
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if (typeof window.fetch === "function") {
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const orig = window.fetch;
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window.fetch = new Proxy(orig, {
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apply(target, thisArg, args) {
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const input = args[0];
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const url =
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typeof input === "string" ? input : (input && input.url) || "";
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const result = Reflect.apply(target, thisArg, args);
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if (match(url)) {
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result
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.then((resp) => {
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try {
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const ctype = resp.headers.get("content-type") || "";
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if (!ctype.includes("json")) return;
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// 立刻 clone,免得页面随后消费了原响应体
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resp
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.clone()
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.json()
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.then((body) => report(url, resp.status, body))
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.catch(() => {});
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} catch (_) {}
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})
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.catch(() => {});
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}
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return result;
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},
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});
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}
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// ---- XMLHttpRequest ----
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const XHR = window.XMLHttpRequest;
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if (XHR && XHR.prototype) {
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const origOpen = XHR.prototype.open;
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const origSend = XHR.prototype.send;
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const urls = new WeakMap(); // 挂在实例上会留可见的自定义属性,用 WeakMap 更干净
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XHR.prototype.open = new Proxy(origOpen, {
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apply(target, thisArg, args) {
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try {
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urls.set(thisArg, String(args[1] ?? ""));
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} catch (_) {}
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return Reflect.apply(target, thisArg, args);
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},
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});
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XHR.prototype.send = new Proxy(origSend, {
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apply(target, thisArg, args) {
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try {
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const url = urls.get(thisArg);
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if (match(url)) {
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thisArg.addEventListener(
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"loadend",
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() => {
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try {
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const rt = thisArg.responseType;
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let body = null;
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if (rt === "" || rt === "text") {
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body = JSON.parse(thisArg.responseText);
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} else if (rt === "json") {
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body = thisArg.response;
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} else {
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return; // arraybuffer / blob 等类型不处理
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}
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if (body != null) report(url, thisArg.status, body);
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} catch (_) {}
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},
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{ once: true }
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);
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}
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} catch (_) {}
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return Reflect.apply(target, thisArg, args);
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},
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});
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}
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})();
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