Bilibili-Evolved/extras/video-link-downloader/video-link-downloader.js
2019-04-23 12:58:52 +08:00

167 lines
6.3 KiB
JavaScript

#!/usr/bin/env node
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const commandLineArgs = require("command-line-args");
const clipboardy = require("clipboardy");
const request = require("request");
const fs = require("fs");
const ProgressBar = require("progress");
const optionDefinitions = [
{ name: 'info', alias: 'i', defaultOption: true, type: String, defaultValue: undefined },
{ name: 'parts', alias: 'p', type: Number, defaultValue: 30 },
{ name: 'output', alias: 'o', type: String, defaultValue: '.' },
];
const commandLineOptions = commandLineArgs(optionDefinitions);
let options = commandLineOptions;
// if (fs.existsSync("settings.json"))
// {
// const jsonOptions = JSON.parse(fs.readFileSync("settings.json").toString("utf-8")) as Settings;
// options = Object.assign(jsonOptions, options);
// }
if (options.parts < 1) {
console.error("分段数不能小于1");
process.exit();
}
class Downloader {
constructor(inputData, progress) {
this.inputData = inputData;
this.progress = progress;
this.progressMap = new Map();
}
updateProgress() {
const progress = this.progressMap ?
[...this.progressMap.values()].reduce((a, b) => a + b, 0) / this.inputData.totalSize : 0;
this.progress && this.progress(progress);
}
cancelDownload() {
[...this.progressMap.keys()].forEach(it => it.abort());
const files = fs.readdirSync(".");
const parts = files.filter(it => it.includes(this.inputData.title));
parts.forEach(file => fs.unlinkSync(file));
console.log("已取消下载");
}
async downloadUrl(url, index = -1) {
const partialLength = Math.round(this.inputData.totalSize / options.parts);
const title = (index === -1 ? this.inputData.title : this.inputData.title + " - " + index.toString());
let startByte = 0;
let part = 0;
const promises = [];
while (startByte < this.inputData.totalSize) {
const endByte = Math.min(this.inputData.totalSize - 1, Math.round(startByte + partialLength));
const range = `bytes=${startByte}-${endByte}`;
promises.push(new Promise((resolve, reject) => {
const makeRequest = () => {
const req = request({
url,
method: "GET",
headers: {
Range: range,
Origin: "https://www.bilibili.com",
Referer: "https://www.bilibili.com",
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36",
},
}).on("complete", response => {
if (response.statusCode.toString()[0] === "2") {
resolve(response);
}
else {
reject(`请求失败`);
}
}).on("data", data => {
this.progressMap.set(req, this.progressMap.get(req) + data.length);
this.updateProgress();
}).on("error", error => {
this.progressMap.set(req, 0);
this.updateProgress();
// makeRequest();
console.error(error);
});
req.pipe(fs.createWriteStream(`${title}.part${part}`));
return req;
};
this.progressMap.set(makeRequest(), 0);
}));
startByte = Math.round(startByte + partialLength) + 1;
part++;
}
await Promise.all(promises);
const dest = title + ".flv";
console.log("正在合并文件...");
if (options.parts === 1) {
fs.renameSync(title + ".part0", dest);
}
else {
if (fs.existsSync(dest)) {
fs.unlinkSync(dest);
}
const files = fs.readdirSync(".");
const parts = files.filter(it => it.includes(title + ".part"));
const partRegex = /.*\.part([\d]+)/;
parts.sort((a, b) => {
const partA = parseInt(a.replace(partRegex, "$1"));
const partB = parseInt(b.replace(partRegex, "$1"));
return partA - partB;
}).forEach(file => {
const buffer = fs.readFileSync(file);
fs.appendFileSync(dest, buffer);
});
parts.forEach(file => fs.unlinkSync(file));
}
return dest;
}
async download() {
if (this.inputData.urls.length === 1) {
return await this.downloadUrl(this.inputData.urls[0]);
}
else {
return await Promise.all(this.inputData.urls.map((url, i) => this.downloadUrl(url, i)));
}
}
}
(async () => {
// console.log(`分段值: ${options.parts}`);
let jsonText = '';
if (fs.existsSync(options.info)) {
jsonText = fs.readFileSync(options.info).toString("utf-8");
}
else {
jsonText = await clipboardy.read();
}
let inputData = { urls: [], totalSize: 0, title: '' };
try {
inputData = JSON.parse(jsonText);
}
catch (error) {
console.log(`未在剪贴板检测到有效数据, 也没有指定输入文件.`);
process.exit();
}
try {
process.chdir(options.output);
const progressBar = new ProgressBar(":percent [:bar]", {
total: inputData.totalSize,
width: 20,
incomplete: ' ',
});
const downloader = new Downloader(inputData, progress => {
progressBar.update(progress);
});
process.on("SIGINT", () => {
progressBar.terminate();
downloader.cancelDownload();
process.exit();
});
progressBar.render();
const result = await downloader.download();
console.log(`下载完成: `);
if (typeof result === "string") {
console.log(result);
}
else {
result.forEach(console.log);
}
}
catch (error) {
console.error(`错误: ${error}`);
}
})();