python gemini client library
git clone
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commit 65027e09b7c621a3fb80400a43cc10bba3428a57
Author: Jason McBrayer <>
Date:   Fri, 20 Sep 2019 12:17:32 -0400

Initial project commit

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diff --git a/ b/ @@ -0,0 +1,660 @@ +### GNU AFFERO GENERAL PUBLIC LICENSE + +Version 3, 19 November 2007 + +Copyright (C) 2007 Free Software Foundation, Inc. +<> + +Everyone is permitted to copy and distribute verbatim copies of this +license document, but changing it is not allowed. + +### Preamble + +The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + +The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +our General Public Licenses are intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains +free software for all its users. + +When we speak of free software, we are referring to freedom, not +price. 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If not, see <>. + +Also add information on how to contact you by electronic and paper +mail. + +If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for +the specific requirements. + +You should also get your employer (if you work as a programmer) or +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. For more information on this, and how to apply and follow +the GNU AGPL, see <>. diff --git a/README.rst b/README.rst @@ -0,0 +1,10 @@ +gusmobile +======= + +This is a client library for the Gemini protocol. It is intended to provide a +programming interface that will be familiar to the users of the `requests' +library, though much simpler. + +It is largely extracted from the code of AV-98, the command-line Gemini client +by solderpunk, the initiator of the Gemini protocol project. + diff --git a/docs/index.rst b/docs/index.rst @@ -0,0 +1,14 @@ +gusmobile +=========== + +This is a client library for the Gemini protocol. + +Basic usage:: + + import gusmobile + + r = gusmobile.get("gemini://") + print(r.text) + + + diff --git a/gusmobile/ b/gusmobile/ @@ -0,0 +1 @@ +from .client import Response, GeminiClient diff --git a/gusmobile/ b/gusmobile/ @@ -0,0 +1,192 @@ +# +# +# Copyright 2019 Jason McBrayer +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. +# +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see <>. + +import cgi +import codecs +import collections +import fnmatch +import io +import mimetypes +import os.path +import random +import shlex +import shutil +import socket +import subprocess +import tempfile +import urllib.parse +import ssl +import time + + +class Response: + content = None + content_type = None + url = None + status = None + status_meta = None + + def __init__(self, content=None, content_type=None, url=None, status=None): + self.content = content + self.content_type = content_type + self.url = url + self.status = status + + +class GeminiClient: + def fetch(self, url): + # Do everything which touches the network in one block, + # so we only need to catch exceptions once + try: + # Is this a local file? + if not + address, f = None, open(url.path, "rb") + else: + address, f = self._send_request(url) + # Read response header + header = f.readline() + header = header.decode("UTF-8").strip() + self._debug("Response header: %s." % header) + + # Catch network errors which may happen on initial connection + except Exception as err: + # Print an error message + if isinstance(err, socket.gaierror): + self.log["dns_failures"] += 1 + print("ERROR: DNS error!") + elif isinstance(err, ConnectionRefusedError): + self.log["refused_connections"] += 1 + print("ERROR: Connection refused!") + elif isinstance(err, ConnectionResetError): + self.log["reset_connections"] += 1 + print("ERROR: Connection reset!") + elif isinstance(err, (TimeoutError, socket.timeout)): + self.log["timeouts"] += 1 + print( + """ERROR: Connection timed out! +Slow internet connection? Use 'set timeout' to be more patient.""" + ) + else: + print("ERROR: " + str(err)) + return + # Validate header + status, meta = header.split(maxsplit=1) + if len(header) > 1024 or len(status) != 2 or not status.isnumeric(): + print("ERROR: Received invalid header from server!") + f.close() + return + + # Handle headers. Not all headers are handled yet. + if status.startswith("1"): + raise NotImplementedError() + # Redirects + elif status.startswith("3"): + raise NotImplementedError() + # Errors + elif status.startswith("4") or status.startswith("5"): + raise NotImplementedError() + # Client cert + elif status.startswith("6"): + raise NotImplementedError() + # Invalid status + elif not status.startswith("2"): + print("ERROR: Server returned undefined status code %s!" % status) + return + + # Handle success + assert status.startswith("2") + mime = meta + if mime == "": + mime = "text/gemini; charset=utf-8" + mime, mime_options = cgi.parse_header(mime) + if "charset" in mime_options: + try: + codecs.lookup(mime_options["charset"]) + except LookupError: + print("Header declared unknown encoding %s" % value) + return + # Read the response body over the network + body = + + # And return. + return Response( + content=body, content_type=mime, url=url.geturl(), status=status + ) + + def _send_request(self, url): + """Send a selector to a given host and port. + Returns the resolved address and binary file with the reply.""" + addresses = self._get_addresses(, url.port) + # Connect to remote host by any address possible + err = None + for address in addresses: + self._debug("Connecting to: " + str(address[4])) + s = socket.socket(address[0], address[1]) + s.settimeout(self.options["timeout"]) + context = ssl.SSLContext() + context.check_hostname = False + context.verify_mode = ssl.CERT_NONE + # Impose minimum TLS version + if sys.version_info.minor == 7: + context.minimum_version = ssl.TLSVersion.TLSv1_2 + else: + context.options | ssl.OP_NO_TLSv1_1 + context.options | ssl.OP_NO_SSLv3 + context.options | ssl.OP_NO_SSLv2 + context.set_ciphers( + "AES+DHE:AES+ECDHE:CHACHA20+DHE:CHACHA20+ECDHE:!SHA1:@STRENGTH" + ) + # print(context.get_ciphers()) + s = context.wrap_socket(s, + try: + s.connect(address[4]) + break + except OSError as e: + err = e + else: + # If we couldn't connect to *any* of the addresses, just + # bubble up the exception from the last attempt and deny + # knowledge of earlier failures. + raise err + + self._debug("Established {} connection.".format(s.version())) + self._debug("Cipher is: {}.".format(s.cipher())) + + # Send request and wrap response in a file descriptor + self._debug("Sending %s<CRLF>" % url.geturl()) + s.sendall((url.geturl() + CRLF).encode("UTF-8")) + return address, s.makefile(mode="rb") + + def _get_addresses(self, host, port): + # DNS lookup - will get IPv4 and IPv6 records if IPv6 is enabled + if ":" in host: + # This is likely a literal IPv6 address, so we can *only* ask for + # IPv6 addresses or getaddrinfo will complain + family_mask = socket.AF_INET6 + elif socket.has_ipv6 and self.options["ipv6"]: + # Accept either IPv4 or IPv6 addresses + family_mask = 0 + else: + # IPv4 only + family_mask = socket.AF_INET + addresses = socket.getaddrinfo( + host, port, family=family_mask, type=socket.SOCK_STREAM + ) + # Sort addresses so IPv6 ones come first + addresses.sort(key=lambda add: add[0] == socket.AF_INET6, reverse=True) + + return addresses diff --git a/ b/ @@ -0,0 +1,29 @@ +import os +from setuptools import setup + + +def read(fname): + return, fname)).read() + + +setup( + name="gusmobile", + version="0.1.0", + author="Jason McBrayer", + author_email="", + description=( + "A simple library for requesting resources using the " "gemini protocol" + ), + license="AGPL3", + keywords="gemini client internet", + url="", + packages=["gusmobile", "tests"], + long_description=read("README.rst"), + classifiers=[ + "Development Status :: 3 - Alpha", + "Intended Audience :: Developers", + "License :: OSI Approved :: GNU Affero General Public License v3 " + "or later (AGPLv3+)", + "Topic :: Internet", + ], +) diff --git a/tests/ b/tests/ diff --git a/tests/ b/tests/ @@ -0,0 +1,6 @@ +import sys +import os + +sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))) + +import gusmobile