A simple Python HTTP proxy that forwards all requests to download.cypress.io to enable Cypress download from NPM behind a Nexus proxy.

cypress-proxy.py

"""
A simple Python HTTP proxy that forwards all requests to download.cypress.io
to enable Cypress download from NPM behind a Nexus proxy.

This is to work around Nexus proxy limitations, see
- https://issues.sonatype.org/browse/NEXUS-22887 and
- https://issues.sonatype.org/browse/NEXUS-22889.

Requires Python 3.

How to run:

  python3 -m venv venv
  . venv/bin/activate
  pip install requests
  python3 cypress-proxy.py
  
See https://stackoverflow.com/a/62643730/258772 if you want to run the script as a daemon.
"""

from http.server import HTTPServer, SimpleHTTPRequestHandler
from io import BytesIO
import requests

PORT = 8000
PLATFORM = "win32"
ARCH = "x64"


class Proxy(SimpleHTTPRequestHandler):
    def do_GET(self):
        url = f"https://download.cypress.io{self.path}?platform={PLATFORM}&arch={ARCH}"
        print(f"Proxying request to {url}")
        response = requests.get(url)
        self.copyfile(BytesIO(response.content), self.wfile)


def run():
    server_address = ('', PORT)
    httpd = HTTPServer(server_address, Proxy)
    print(f"Cypress proxy running on port {PORT}")
    httpd.serve_forever()


if __name__ == '__main__':
    run()