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import * as fs from 'node:fs';
import * as stream from 'node:stream';
import * as util from 'node:util';
import { Inject, Injectable } from '@nestjs/common';
import IPCIDR from 'ip-cidr';
import PrivateIp from 'private-ip';
import chalk from 'chalk';
import got, * as Got from 'got';
import { parse } from 'content-disposition';
import { DI } from '@/di-symbols.js';
import type { Config } from '@/config.js';
import { HttpRequestService } from '@/core/HttpRequestService.js';
import { createTemp } from '@/misc/create-temp.js';
import { StatusError } from '@/misc/status-error.js';
import { LoggerService } from '@/core/LoggerService.js';
import type Logger from '@/logger.js';
const pipeline = util.promisify(stream.pipeline);
import { bindThis } from '@/decorators.js';
@Injectable()
export class DownloadService {
private logger: Logger;
constructor(
@Inject(DI.config)
private config: Config,
private httpRequestService: HttpRequestService,
private loggerService: LoggerService,
) {
this.logger = this.loggerService.getLogger('download');
}
@bindThis
public async downloadUrl(url: string, path: string): Promise<{
filename: string;
}> {
this.logger.info(`Downloading ${chalk.cyan(url)} to ${chalk.cyanBright(path)} ...`);
const timeout = 30 * 1000;
const operationTimeout = 60 * 1000;
const maxSize = this.config.maxFileSize ?? 262144000;
const urlObj = new URL(url);
let filename = urlObj.pathname.split('/').pop() ?? 'untitled';
const req = got.stream(url, {
headers: {
'User-Agent': this.config.userAgent,
},
timeout: {
lookup: timeout,
connect: timeout,
secureConnect: timeout,
socket: timeout, // read timeout
response: timeout,
send: timeout,
request: operationTimeout, // whole operation timeout
},
agent: {
http: this.httpRequestService.httpAgent,
https: this.httpRequestService.httpsAgent,
},
http2: false, // default
retry: {
limit: 0,
},
enableUnixSockets: false,
}).on('response', (res: Got.Response) => {
if ((process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'test') && !this.config.proxy && res.ip) {
if (this.isPrivateIp(res.ip)) {
this.logger.warn(`Blocked address: ${res.ip}`);
req.destroy();
}
}
const contentLength = res.headers['content-length'];
if (contentLength != null) {
const size = Number(contentLength);
if (size > maxSize) {
this.logger.warn(`maxSize exceeded (${size} > ${maxSize}) on response`);
req.destroy();
}
}
const contentDisposition = res.headers['content-disposition'];
if (contentDisposition != null) {
const parsed = parse(contentDisposition);
if (parsed.parameters.filename) {
filename = parsed.parameters.filename;
}
}
}).on('downloadProgress', (progress: Got.Progress) => {
if (progress.transferred > maxSize) {
this.logger.warn(`maxSize exceeded (${progress.transferred} > ${maxSize}) on downloadProgress`);
req.destroy();
}
});
try {
await pipeline(req, fs.createWriteStream(path));
} catch (e) {
if (e instanceof Got.HTTPError) {
throw new StatusError(`${e.response.statusCode} ${e.response.statusMessage}`, e.response.statusCode, e.response.statusMessage);
} else {
throw e;
}
}
this.logger.succ(`Download finished: ${chalk.cyan(url)}`);
return {
filename,
};
}
@bindThis
public async downloadTextFile(url: string): Promise<string> {
// Create temp file
const [path, cleanup] = await createTemp();
this.logger.info(`text file: Temp file is ${path}`);
try {
// write content at URL to temp file
await this.downloadUrl(url, path);
const text = await util.promisify(fs.readFile)(path, 'utf8');
return text;
} finally {
cleanup();
}
}
@bindThis
private isPrivateIp(ip: string): boolean {
for (const net of this.config.allowedPrivateNetworks ?? []) {
const cidr = new IPCIDR(net);
if (cidr.contains(ip)) {
return false;
}
}
return PrivateIp(ip) ?? false;
}
}
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