746 lines
20 KiB
JavaScript
Executable File
746 lines
20 KiB
JavaScript
Executable File
#!/usr/bin/env node
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"use strict";
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const fs = require("fs");
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const fsp = require("fs/promises");
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const http = require("http");
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const os = require("os");
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const path = require("path");
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const { spawn } = require("child_process");
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const DEFAULT_VIEWPORT_WIDTH = 1365;
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const DEFAULT_VIEWPORT_HEIGHT = 900;
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const DEFAULT_WAIT_MS = 1500;
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const DEFAULT_TIMEOUT_MS = 45000;
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const DEFAULT_MAX_CHARS = 16000;
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function stdout(message) {
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process.stdout.write(`${message}\n`);
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}
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function parseArgs(argv) {
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const result = {};
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for (let index = 0; index < argv.length; index += 1) {
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const token = argv[index];
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if (!token.startsWith("--")) {
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throw new Error(`存在不支持的参数: ${token}`);
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}
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const equalIndex = token.indexOf("=");
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let key = token.slice(2);
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let value;
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if (equalIndex >= 0) {
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key = token.slice(2, equalIndex);
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value = token.slice(equalIndex + 1);
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} else {
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const next = argv[index + 1];
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if (next === undefined || next.startsWith("--")) {
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value = "true";
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} else {
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value = next;
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index += 1;
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}
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}
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result[key] = value;
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}
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return result;
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}
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function parseNumber(value, name, fallback = undefined) {
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if (value === undefined || value === "") {
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return fallback;
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}
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const parsed = Number(value);
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if (!Number.isFinite(parsed)) {
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throw new Error(`${name} 必须是数字`);
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}
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return parsed;
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}
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function parseInteger(value, name, fallback) {
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const parsed = parseNumber(value, name, fallback);
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if (!Number.isInteger(parsed)) {
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throw new Error(`${name} 必须是整数`);
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}
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return parsed;
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}
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function validateUrl(value) {
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if (!value || !value.trim()) {
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throw new Error("缺少网页链接");
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}
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let parsed;
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try {
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parsed = new URL(value.trim());
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} catch (error) {
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throw new Error(`网页链接格式不正确: ${value}`);
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}
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if (!["http:", "https:"].includes(parsed.protocol) || !parsed.hostname) {
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throw new Error("网页链接必须是 http 或 https 地址");
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}
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return parsed.toString();
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}
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function normalizeParams(raw) {
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const url = validateUrl(raw.url || "");
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const mode = raw.mode || "content";
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if (!["content", "screenshot"].includes(mode)) {
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throw new Error("mode 只能是 content 或 screenshot");
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}
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const screenshotMode = raw.screenshot_mode || "full";
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if (!["full", "viewport", "selector", "region"].includes(screenshotMode)) {
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throw new Error(
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"screenshot_mode 只能是 full、viewport、selector 或 region",
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);
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}
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const viewportWidth = parseInteger(
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raw.viewport_width || raw.width,
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"width",
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DEFAULT_VIEWPORT_WIDTH,
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);
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const viewportHeight = parseInteger(
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raw.viewport_height || raw.height,
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"height",
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DEFAULT_VIEWPORT_HEIGHT,
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);
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const waitMs = parseInteger(raw.wait_ms, "wait_ms", DEFAULT_WAIT_MS);
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const timeoutMs = parseInteger(
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raw.timeout_ms,
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"timeout_ms",
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DEFAULT_TIMEOUT_MS,
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);
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const maxChars = parseInteger(raw.max_chars, "max_chars", DEFAULT_MAX_CHARS);
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const maxFullHeight = parseInteger(
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raw.max_full_height,
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"max_full_height",
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60000,
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);
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if (viewportWidth <= 0 || viewportHeight <= 0) {
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throw new Error("视口 width 和 height 必须大于 0");
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}
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if (waitMs < 0) {
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throw new Error("wait_ms 不能小于 0");
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}
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if (timeoutMs <= 0) {
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throw new Error("timeout_ms 必须大于 0");
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}
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if (maxChars <= 0) {
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throw new Error("max_chars 必须大于 0");
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}
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if (maxFullHeight <= 0) {
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throw new Error("max_full_height 必须大于 0");
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}
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const params = {
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url,
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mode,
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screenshotMode,
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selector: raw.selector || "",
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x: parseNumber(raw.x, "x"),
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y: parseNumber(raw.y, "y"),
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regionWidth: parseNumber(
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raw.region_width || (screenshotMode === "region" ? raw.width : undefined),
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"width",
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),
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regionHeight: parseNumber(
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raw.region_height ||
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(screenshotMode === "region" ? raw.height : undefined),
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"height",
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),
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viewportWidth,
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viewportHeight,
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waitMs,
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timeoutMs,
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maxChars,
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maxFullHeight,
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output: raw.output || "",
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send: raw.send || "auto",
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};
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if (!["auto", "true", "false"].includes(params.send)) {
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throw new Error("send 只能是 auto、true 或 false");
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}
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if (
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mode === "screenshot" &&
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screenshotMode === "selector" &&
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!params.selector.trim()
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) {
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throw new Error("selector 截图模式必须传 selector");
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}
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if (mode === "screenshot" && screenshotMode === "region") {
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for (const key of ["x", "y", "regionWidth", "regionHeight"]) {
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if (params[key] === undefined) {
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throw new Error("region 截图模式必须传 x、y、width、height");
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}
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}
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if (params.regionWidth <= 0 || params.regionHeight <= 0) {
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throw new Error("region 截图区域 width 和 height 必须大于 0");
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}
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}
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return params;
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}
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function fileExists(filePath) {
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try {
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fs.accessSync(filePath, fs.constants.X_OK);
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return true;
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} catch (error) {
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return false;
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}
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}
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function findChromium() {
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const candidates = [
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process.env.CHROME_BIN,
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process.env.CHROME_PATH,
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"/usr/bin/chromium",
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"/usr/bin/chromium-browser",
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"/usr/bin/google-chrome",
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"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome",
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"/Applications/Chromium.app/Contents/MacOS/Chromium",
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].filter(Boolean);
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for (const candidate of candidates) {
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if (fileExists(candidate)) {
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return candidate;
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}
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}
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throw new Error("未找到 Chromium，请设置 CHROME_BIN 或 CHROME_PATH");
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}
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function wait(ms) {
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return new Promise((resolve) => setTimeout(resolve, ms));
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}
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function withTimeout(promise, ms, message) {
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let timer;
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const timeout = new Promise((_, reject) => {
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timer = setTimeout(() => reject(new Error(message)), ms);
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});
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return Promise.race([promise, timeout]).finally(() => clearTimeout(timer));
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}
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async function launchChromium(params) {
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const chromeBin = findChromium();
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const userDataDir = await fsp.mkdtemp(
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path.join(os.tmpdir(), "web-page-chromium-"),
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);
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const args = [
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"--headless=new",
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"--no-sandbox",
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"--disable-gpu",
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"--disable-dev-shm-usage",
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"--disable-background-networking",
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"--disable-default-apps",
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"--disable-extensions",
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"--disable-sync",
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"--hide-scrollbars",
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"--no-first-run",
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"--no-default-browser-check",
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"--remote-debugging-port=0",
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`--user-data-dir=${userDataDir}`,
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`--window-size=${params.viewportWidth},${params.viewportHeight}`,
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"about:blank",
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];
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const chrome = spawn(chromeBin, args, { stdio: ["ignore", "pipe", "pipe"] });
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let logBuffer = "";
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const websocketUrlPromise = new Promise((resolve, reject) => {
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const onData = (chunk) => {
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logBuffer += chunk.toString("utf8");
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const match = logBuffer.match(/DevTools listening on (ws:\/\/[^\s]+)/);
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if (match) {
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resolve(match[1]);
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}
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};
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chrome.stdout.on("data", onData);
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chrome.stderr.on("data", onData);
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chrome.once("error", reject);
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chrome.once("exit", (code) => {
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reject(
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new Error(`Chromium 启动失败，退出码: ${code}; ${logBuffer.trim()}`),
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);
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});
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});
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const websocketUrl = await withTimeout(
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websocketUrlPromise,
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params.timeoutMs,
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"等待 Chromium DevTools 地址超时",
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);
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return { chrome, userDataDir, websocketUrl };
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}
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class CdpClient {
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constructor(websocketUrl) {
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this.websocketUrl = websocketUrl;
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this.nextId = 1;
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this.pending = new Map();
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this.listeners = [];
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this.ws = null;
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}
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async connect(timeoutMs) {
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if (typeof WebSocket === "undefined") {
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throw new Error(
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"当前 Node.js 缺少 WebSocket 支持，请使用 Node.js 22+ 或基础镜像中的 Node.js 24+",
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);
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}
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this.ws = new WebSocket(this.websocketUrl);
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this.ws.addEventListener("message", (event) =>
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this.handleMessage(event.data),
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);
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await withTimeout(
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new Promise((resolve, reject) => {
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this.ws.addEventListener("open", resolve, { once: true });
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this.ws.addEventListener(
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"error",
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() => reject(new Error("连接 Chromium DevTools 失败")),
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{ once: true },
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);
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}),
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timeoutMs,
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"连接 Chromium DevTools 超时",
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);
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}
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handleMessage(raw) {
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let rawText;
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if (typeof raw === "string") {
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rawText = raw;
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} else if (Buffer.isBuffer(raw)) {
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rawText = raw.toString("utf8");
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} else if (raw instanceof ArrayBuffer) {
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rawText = Buffer.from(raw).toString("utf8");
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} else {
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rawText = String(raw);
|
||
}
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let message;
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try {
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message = JSON.parse(rawText);
|
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} catch (error) {
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return;
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}
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if (message.id && this.pending.has(message.id)) {
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const { resolve, reject } = this.pending.get(message.id);
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this.pending.delete(message.id);
|
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if (message.error) {
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reject(
|
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new Error(message.error.message || JSON.stringify(message.error)),
|
||
);
|
||
} else {
|
||
resolve(message.result || {});
|
||
}
|
||
return;
|
||
}
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||
|
||
if (message.method) {
|
||
for (const listener of [...this.listeners]) {
|
||
if (listener.method !== message.method) {
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continue;
|
||
}
|
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if (listener.sessionId && listener.sessionId !== message.sessionId) {
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continue;
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}
|
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listener.resolve(message.params || {});
|
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this.listeners = this.listeners.filter((item) => item !== listener);
|
||
}
|
||
}
|
||
}
|
||
|
||
send(method, params = {}, sessionId = undefined) {
|
||
const id = this.nextId;
|
||
this.nextId += 1;
|
||
const payload = { id, method, params };
|
||
if (sessionId) {
|
||
payload.sessionId = sessionId;
|
||
}
|
||
|
||
return new Promise((resolve, reject) => {
|
||
this.pending.set(id, { resolve, reject });
|
||
this.ws.send(JSON.stringify(payload));
|
||
});
|
||
}
|
||
|
||
waitForEvent(method, sessionId, timeoutMs) {
|
||
return withTimeout(
|
||
new Promise((resolve) => {
|
||
this.listeners.push({ method, sessionId, resolve });
|
||
}),
|
||
timeoutMs,
|
||
`等待事件 ${method} 超时`,
|
||
);
|
||
}
|
||
|
||
close() {
|
||
if (this.ws) {
|
||
this.ws.close();
|
||
}
|
||
}
|
||
}
|
||
|
||
async function createPage(client, params) {
|
||
const target = await client.send("Target.createTarget", {
|
||
url: "about:blank",
|
||
});
|
||
const attached = await client.send("Target.attachToTarget", {
|
||
targetId: target.targetId,
|
||
flatten: true,
|
||
});
|
||
const sessionId = attached.sessionId;
|
||
await client.send("Page.enable", {}, sessionId);
|
||
await client.send("Runtime.enable", {}, sessionId);
|
||
await client.send("Network.enable", {}, sessionId);
|
||
await client.send(
|
||
"Emulation.setDeviceMetricsOverride",
|
||
{
|
||
width: params.viewportWidth,
|
||
height: params.viewportHeight,
|
||
deviceScaleFactor: 1,
|
||
mobile: false,
|
||
},
|
||
sessionId,
|
||
);
|
||
return sessionId;
|
||
}
|
||
|
||
async function navigate(client, sessionId, params) {
|
||
const loadEvent = client
|
||
.waitForEvent("Page.loadEventFired", sessionId, params.timeoutMs)
|
||
.catch(() => null);
|
||
await client.send("Page.navigate", { url: params.url }, sessionId);
|
||
await loadEvent;
|
||
if (params.waitMs > 0) {
|
||
await wait(params.waitMs);
|
||
}
|
||
}
|
||
|
||
async function evaluate(client, sessionId, expression) {
|
||
const result = await client.send(
|
||
"Runtime.evaluate",
|
||
{
|
||
expression,
|
||
awaitPromise: true,
|
||
returnByValue: true,
|
||
},
|
||
sessionId,
|
||
);
|
||
if (result.exceptionDetails) {
|
||
throw new Error(result.exceptionDetails.text || "页面脚本执行失败");
|
||
}
|
||
return result.result ? result.result.value : undefined;
|
||
}
|
||
|
||
function cleanText(text) {
|
||
return String(text || "")
|
||
.replace(/\u00a0/g, " ")
|
||
.split("\n")
|
||
.map((line) => line.trim().replace(/[ \t]+/g, " "))
|
||
.filter((line, index, lines) => line || lines[index - 1])
|
||
.join("\n")
|
||
.trim();
|
||
}
|
||
|
||
async function extractContent(client, sessionId, params) {
|
||
const data = await evaluate(
|
||
client,
|
||
sessionId,
|
||
`(() => {
|
||
const textOf = (node) => (node && node.innerText ? node.innerText.trim() : '');
|
||
const meta = (selector) => {
|
||
const el = document.querySelector(selector);
|
||
return el ? (el.getAttribute('content') || '').trim() : '';
|
||
};
|
||
const candidates = Array.from(document.querySelectorAll('article, main, [role="main"], #content, .content, .article, .post, .entry-content'));
|
||
let root = document.body;
|
||
const bodyLength = textOf(document.body).length;
|
||
let bestLength = 0;
|
||
for (const candidate of candidates) {
|
||
const length = textOf(candidate).length;
|
||
if (length > bestLength) {
|
||
root = candidate;
|
||
bestLength = length;
|
||
}
|
||
}
|
||
if (bestLength < bodyLength * 0.25) {
|
||
root = document.body;
|
||
}
|
||
const headings = Array.from(document.querySelectorAll('h1, h2, h3'))
|
||
.map((el) => el.innerText.trim())
|
||
.filter(Boolean)
|
||
.slice(0, 30);
|
||
const links = Array.from(document.querySelectorAll('a[href]'))
|
||
.map((el) => ({ text: el.innerText.trim().replace(/\s+/g, ' '), href: el.href }))
|
||
.filter((item) => item.text && item.href && /^https?:/.test(item.href))
|
||
.slice(0, 40);
|
||
return {
|
||
title: document.title || '',
|
||
url: location.href,
|
||
lang: document.documentElement.lang || '',
|
||
description: meta('meta[name="description"]') || meta('meta[property="og:description"]'),
|
||
text: textOf(root) || textOf(document.body),
|
||
headings,
|
||
links,
|
||
};
|
||
})()`,
|
||
);
|
||
|
||
const text = cleanText(data.text || "");
|
||
const truncated = text.length > params.maxChars;
|
||
const body = truncated
|
||
? `${text.slice(0, params.maxChars)}\n\n[内容过长，已截断到 ${params.maxChars} 字]`
|
||
: text;
|
||
const headings = [...new Set(data.headings || [])].slice(0, 20);
|
||
const links = [];
|
||
const seenLinks = new Set();
|
||
for (const link of data.links || []) {
|
||
const key = `${link.text}\t${link.href}`;
|
||
if (seenLinks.has(key)) {
|
||
continue;
|
||
}
|
||
seenLinks.add(key);
|
||
links.push(link);
|
||
if (links.length >= 20) {
|
||
break;
|
||
}
|
||
}
|
||
|
||
const parts = [
|
||
`标题：${data.title || "(无标题)"}`,
|
||
`URL：${data.url || params.url}`,
|
||
];
|
||
if (data.lang) {
|
||
parts.push(`语言：${data.lang}`);
|
||
}
|
||
if (data.description) {
|
||
parts.push(`页面描述：${cleanText(data.description)}`);
|
||
}
|
||
if (headings.length) {
|
||
parts.push(
|
||
`主要标题：\n${headings.map((heading) => `- ${heading}`).join("\n")}`,
|
||
);
|
||
}
|
||
parts.push(`正文：\n${body || "(未抽取到可见正文)"}`);
|
||
if (links.length) {
|
||
parts.push(
|
||
`主要链接：\n${links.map((link) => `- ${link.text}: ${link.href}`).join("\n")}`,
|
||
);
|
||
}
|
||
return parts.join("\n\n");
|
||
}
|
||
|
||
async function getLayoutMetrics(client, sessionId) {
|
||
const metrics = await client.send("Page.getLayoutMetrics", {}, sessionId);
|
||
return (
|
||
metrics.cssContentSize ||
|
||
metrics.contentSize || { x: 0, y: 0, width: 0, height: 0 }
|
||
);
|
||
}
|
||
|
||
async function getSelectorClip(client, sessionId, selector) {
|
||
const encodedSelector = JSON.stringify(selector);
|
||
const rect = await evaluate(
|
||
client,
|
||
sessionId,
|
||
`(async () => {
|
||
const el = document.querySelector(${encodedSelector});
|
||
if (!el) return null;
|
||
el.scrollIntoView({ block: 'center', inline: 'center' });
|
||
await new Promise((resolve) => requestAnimationFrame(() => requestAnimationFrame(resolve)));
|
||
const r = el.getBoundingClientRect();
|
||
return { x: r.left + window.scrollX, y: r.top + window.scrollY, width: r.width, height: r.height };
|
||
})()`,
|
||
);
|
||
if (!rect) {
|
||
throw new Error(`未找到 selector 对应元素: ${selector}`);
|
||
}
|
||
if (rect.width <= 0 || rect.height <= 0) {
|
||
throw new Error(`selector 对应元素尺寸为空: ${selector}`);
|
||
}
|
||
return rect;
|
||
}
|
||
|
||
async function getScreenshotClip(client, sessionId, params) {
|
||
if (params.screenshotMode === "region") {
|
||
return {
|
||
x: params.x,
|
||
y: params.y,
|
||
width: params.regionWidth,
|
||
height: params.regionHeight,
|
||
scale: 1,
|
||
};
|
||
}
|
||
if (params.screenshotMode === "selector") {
|
||
const rect = await getSelectorClip(client, sessionId, params.selector);
|
||
return { ...rect, scale: 1 };
|
||
}
|
||
if (params.screenshotMode === "viewport") {
|
||
return {
|
||
x: 0,
|
||
y: 0,
|
||
width: params.viewportWidth,
|
||
height: params.viewportHeight,
|
||
scale: 1,
|
||
};
|
||
}
|
||
|
||
const contentSize = await getLayoutMetrics(client, sessionId);
|
||
const width = Math.max(
|
||
1,
|
||
Math.ceil(contentSize.width || params.viewportWidth),
|
||
);
|
||
const rawHeight = Math.max(
|
||
1,
|
||
Math.ceil(contentSize.height || params.viewportHeight),
|
||
);
|
||
const height = Math.min(rawHeight, params.maxFullHeight);
|
||
return {
|
||
x: 0,
|
||
y: 0,
|
||
width,
|
||
height,
|
||
scale: 1,
|
||
truncated: rawHeight > height,
|
||
rawHeight,
|
||
};
|
||
}
|
||
|
||
async function captureScreenshot(client, sessionId, params) {
|
||
const clip = await getScreenshotClip(client, sessionId, params);
|
||
const result = await client.send(
|
||
"Page.captureScreenshot",
|
||
{
|
||
format: "png",
|
||
fromSurface: true,
|
||
captureBeyondViewport: true,
|
||
clip: {
|
||
x: Math.max(0, clip.x),
|
||
y: Math.max(0, clip.y),
|
||
width: Math.max(1, clip.width),
|
||
height: Math.max(1, clip.height),
|
||
scale: 1,
|
||
},
|
||
},
|
||
sessionId,
|
||
);
|
||
if (!result.data) {
|
||
throw new Error("Chromium 未返回截图数据");
|
||
}
|
||
const output =
|
||
params.output ||
|
||
path.join(os.tmpdir(), `web-page-screenshot-${Date.now()}.png`);
|
||
await fsp.mkdir(path.dirname(output), { recursive: true });
|
||
await fsp.writeFile(output, Buffer.from(result.data, "base64"));
|
||
return { output, clip };
|
||
}
|
||
|
||
function postJson(url, body, timeoutMs) {
|
||
return new Promise((resolve, reject) => {
|
||
const parsed = new URL(url);
|
||
const payload = Buffer.from(JSON.stringify(body), "utf8");
|
||
const request = http.request(
|
||
{
|
||
hostname: parsed.hostname,
|
||
port: parsed.port,
|
||
path: parsed.pathname + parsed.search,
|
||
method: "POST",
|
||
headers: {
|
||
"Content-Type": "application/json",
|
||
"Content-Length": payload.length,
|
||
},
|
||
timeout: timeoutMs,
|
||
},
|
||
(response) => {
|
||
const chunks = [];
|
||
response.on("data", (chunk) => chunks.push(chunk));
|
||
response.on("end", () => {
|
||
const text = Buffer.concat(chunks).toString("utf8");
|
||
if (response.statusCode < 200 || response.statusCode >= 300) {
|
||
reject(new Error(`HTTP ${response.statusCode}: ${text}`));
|
||
return;
|
||
}
|
||
resolve(text);
|
||
});
|
||
},
|
||
);
|
||
request.on("error", reject);
|
||
request.on("timeout", () =>
|
||
request.destroy(new Error("请求机器人客户端超时")),
|
||
);
|
||
request.write(payload);
|
||
request.end();
|
||
});
|
||
}
|
||
|
||
async function maybeSendScreenshot(params, filePath) {
|
||
if (params.send === "false") {
|
||
return false;
|
||
}
|
||
const clientPort = (process.env.ROBOT_WECHAT_CLIENT_PORT || "").trim();
|
||
const toWxid = (process.env.ROBOT_FROM_WX_ID || "").trim();
|
||
if (!clientPort || !toWxid) {
|
||
if (params.send === "true") {
|
||
throw new Error(
|
||
"环境变量 ROBOT_WECHAT_CLIENT_PORT 或 ROBOT_FROM_WX_ID 未配置",
|
||
);
|
||
}
|
||
return false;
|
||
}
|
||
const sendUrl = `http://127.0.0.1:${clientPort}/api/v1/robot/message/send/image/local`;
|
||
await postJson(
|
||
sendUrl,
|
||
{ to_wxid: toWxid, file_path: filePath },
|
||
params.timeoutMs,
|
||
);
|
||
return true;
|
||
}
|
||
|
||
async function run() {
|
||
const params = normalizeParams(parseArgs(process.argv.slice(2)));
|
||
const browser = await launchChromium(params);
|
||
const client = new CdpClient(browser.websocketUrl);
|
||
try {
|
||
await client.connect(params.timeoutMs);
|
||
const sessionId = await createPage(client, params);
|
||
await navigate(client, sessionId, params);
|
||
|
||
if (params.mode === "content") {
|
||
stdout(await extractContent(client, sessionId, params));
|
||
return;
|
||
}
|
||
|
||
const screenshot = await captureScreenshot(client, sessionId, params);
|
||
const sent = await maybeSendScreenshot(params, screenshot.output);
|
||
if (sent) {
|
||
const suffix = screenshot.clip.truncated
|
||
? `，页面过长，已截取前 ${Math.round(screenshot.clip.height)}px / ${Math.round(screenshot.clip.rawHeight)}px`
|
||
: "";
|
||
stdout(`页面截图已发送${suffix}`);
|
||
} else {
|
||
const suffix = screenshot.clip.truncated
|
||
? `（页面过长，已截取前 ${Math.round(screenshot.clip.height)}px / ${Math.round(screenshot.clip.rawHeight)}px）`
|
||
: "";
|
||
stdout(`页面截图已保存: ${screenshot.output}${suffix}`);
|
||
}
|
||
} finally {
|
||
client.close();
|
||
browser.chrome.kill("SIGKILL");
|
||
await fsp.rm(browser.userDataDir, { recursive: true, force: true });
|
||
}
|
||
}
|
||
|
||
run().catch((error) => {
|
||
stdout(`执行失败: ${error && error.stack ? error.stack : error}`);
|
||
process.exit(1);
|
||
});
|