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/**
* Copyright 2023 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {createWriteStream} from 'fs';
import * as http from 'http';
import * as https from 'https';
import {URL} from 'url';
import createHttpsProxyAgent from 'https-proxy-agent';
import {getProxyForUrl} from 'proxy-from-env';
export function headHttpRequest(url: URL): Promise<boolean> {
return new Promise(resolve => {
const request = httpRequest(
url,
'HEAD',
response => {
resolve(response.statusCode === 200);
},
false
);
request.on('error', () => {
resolve(false);
});
});
}
export function httpRequest(
url: URL,
method: string,
response: (x: http.IncomingMessage) => void,
keepAlive = true
): http.ClientRequest {
const options: http.RequestOptions = {
protocol: url.protocol,
hostname: url.hostname,
port: url.port,
path: url.pathname + url.search,
method,
headers: keepAlive ? {Connection: 'keep-alive'} : undefined,
};
const proxyURL = getProxyForUrl(url.toString());
if (proxyURL) {
const proxy = new URL(proxyURL);
if (proxy.protocol === 'http:') {
options.path = url.href;
options.hostname = proxy.hostname;
options.protocol = proxy.protocol;
options.port = proxy.port;
options.headers ??= {};
options.headers['Host'] ||= url.host;
} else {
options.agent = createHttpsProxyAgent({
host: proxy.host,
path: proxy.pathname,
port: proxy.port,
secureProxy: proxy.protocol === 'https:',
headers: options.headers,
});
}
}
const requestCallback = (res: http.IncomingMessage): void => {
if (
res.statusCode &&
res.statusCode >= 300 &&
res.statusCode < 400 &&
res.headers.location
) {
httpRequest(new URL(res.headers.location), method, response);
} else {
response(res);
}
};
const request =
options.protocol === 'https:'
? https.request(options, requestCallback)
: http.request(options, requestCallback);
request.end();
return request;
}
/**
* @internal
*/
export function downloadFile(
url: URL,
destinationPath: string,
progressCallback?: (downloadedBytes: number, totalBytes: number) => void
): Promise<void> {
return new Promise<void>((resolve, reject) => {
let downloadedBytes = 0;
let totalBytes = 0;
function onData(chunk: string): void {
downloadedBytes += chunk.length;
progressCallback!(downloadedBytes, totalBytes);
}
const request = httpRequest(url, 'GET', response => {
if (response.statusCode !== 200) {
const error = new Error(
`Download failed: server returned code ${response.statusCode}. URL: ${url}`
);
// consume response data to free up memory
response.resume();
reject(error);
return;
}
const file = createWriteStream(destinationPath);
file.on('finish', () => {
return resolve();
});
file.on('error', error => {
return reject(error);
});
response.pipe(file);
totalBytes = parseInt(response.headers['content-length']!, 10);
if (progressCallback) {
response.on('data', onData);
}
});
request.on('error', error => {
return reject(error);
});
});
}
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