!/usr/bin/env python3

import cgi

import os

import socket

import ssl

import sys

import urllib.parse

def absolutise_url(base, relative):

# Absolutise relative links

if "://" not in relative:

# Python's URL tools somehow only work with known schemes?

base = base.replace("gemini://","http://")

relative = urllib.parse.urljoin(base, relative)

relative = relative.replace("http://", "gemini://")

return relative

if len(sys.argv) != 2:

print("Usage:")

print("gcat gemini://gemini.circumlunar.space")

sys.exit(1)

url = sys.argv[1]

parsed_url = urllib.parse.urlparse(url)

if parsed_url.scheme == "":

url = "gemini://"+url

parsed_url = urllib.parse.urlparse(url)

if parsed_url.scheme != "gemini":

print("Sorry, Gemini links only.")

sys.exit(1)

if parsed_url.port is not None:

useport = parsed_url.port

else:

useport = 1965

Do the Gemini transaction

while True:

s = socket.create_connection((parsed_url.hostname, useport))

context = ssl.SSLContext()

context.check_hostname = False

context.verify_mode = ssl.CERT_NONE

s = context.wrap_socket(s, server_hostname = parsed_url.netloc)

s.sendall((url + '\r\n').encode("UTF-8"))

# Get header and check for redirects

fp = s.makefile("rb")

header = fp.readline()

print(header.decode("UTF-8"), end="")

header = header.decode("UTF-8").strip()

status, mime = header.split()[:2]

# Handle input requests

if status.startswith("1"):

# Prompt

query = input("INPUT" + mime + "> ")

url += "?" + urllib.parse.quote(query) # Bit lazy...

# Follow redirects

elif status.startswith("3"):

url = absolutise_url(url, mime)

parsed_url = urllib.parse.urlparse(url)

# Otherwise, we're done.

else:

break

Fail if transaction was not successful

if status.startswith("2"):

if mime.startswith("text/"):

# Decode according to declared charset

mime, mime_opts = cgi.parse_header(mime)

body = fp.read()

body = body.decode(mime_opts.get("charset","UTF-8"))

print(body, end="")

else:

print(fp.read(), end="")