gusmobile

Unnamed repository; edit this file 'description' to name the repository.
git clone git://code.clttr.info/gusmobile.git
Log | Files | Refs | LICENSE

commit 65027e09b7c621a3fb80400a43cc10bba3428a57
Author: Jason McBrayer <jmcbray@carcosa.net>
Date:   Fri, 20 Sep 2019 12:17:32 -0400

Initial project commit

Diffstat:
ALICENSE.md | 660+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AREADME.rst | 10++++++++++
Adocs/index.rst | 14++++++++++++++
Agusmobile/__init__.py | 1+
Agusmobile/client.py | 192+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Asetup.py | 29+++++++++++++++++++++++++++++
Atests/__init__.py | 0
Atests/context.py | 6++++++
8 files changed, 912 insertions(+), 0 deletions(-)

diff --git a/LICENSE.md b/LICENSE.md @@ -0,0 +1,660 @@ +### GNU AFFERO GENERAL PUBLIC LICENSE + +Version 3, 19 November 2007 + +Copyright (C) 2007 Free Software Foundation, Inc. +<https://fsf.org/> + +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. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +them if you wish), that you receive source code or can get it if you +want it, that you can change the software or use pieces of it in new +free programs, and that you know you can do these things. + +Developers that use our General Public Licenses protect your rights +with two steps: (1) assert copyright on the software, and (2) offer +you this License which gives you legal permission to copy, distribute +and/or modify the software. + +A secondary benefit of defending all users' freedom is that +improvements made in alternate versions of the program, if they +receive widespread use, become available for other developers to +incorporate. Many developers of free software are heartened and +encouraged by the resulting cooperation. However, in the case of +software used on network servers, this result may fail to come about. +The GNU General Public License permits making a modified version and +letting the public access it on a server without ever releasing its +source code to the public. + +The GNU Affero General Public License is designed specifically to +ensure that, in such cases, the modified source code becomes available +to the community. It requires the operator of a network server to +provide the source code of the modified version running there to the +users of that server. Therefore, public use of a modified version, on +a publicly accessible server, gives the public access to the source +code of the modified version. + +An older license, called the Affero General Public License and +published by Affero, was designed to accomplish similar goals. 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Additional Terms. + +"Additional permissions" are terms that supplement the terms of this +License by making exceptions from one or more of its conditions. +Additional permissions that are applicable to the entire Program shall +be treated as though they were included in this License, to the extent +that they are valid under applicable law. If additional permissions +apply only to part of the Program, that part may be used separately +under those permissions, but the entire Program remains governed by +this License without regard to the additional permissions. + +When you convey a copy of a covered work, you may at your option +remove any additional permissions from that copy, or from any part of +it. (Additional permissions may be written to require their own +removal in certain cases when you modify the work.) 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Termination. + +You may not propagate or modify a covered work except as expressly +provided under this License. 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You may not convey a covered work if you +are a party to an arrangement with a third party that is in the +business of distributing software, under which you make payment to the +third party based on the extent of your activity of conveying the +work, and under which the third party grants, to any of the parties +who would receive the covered work from you, a discriminatory patent +license (a) in connection with copies of the covered work conveyed by +you (or copies made from those copies), or (b) primarily for and in +connection with specific products or compilations that contain the +covered work, unless you entered into that arrangement, or that patent +license was granted, prior to 28 March 2007. + +Nothing in this License shall be construed as excluding or limiting +any implied license or other defenses to infringement that may +otherwise be available to you under applicable patent law. + +#### 12. No Surrender of Others' Freedom. + +If conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot convey a +covered work so as to satisfy simultaneously your obligations under +this License and any other pertinent obligations, then as a +consequence you may not convey it at all. For example, if you agree to +terms that obligate you to collect a royalty for further conveying +from those to whom you convey the Program, the only way you could +satisfy both those terms and this License would be to refrain entirely +from conveying the Program. + +#### 13. Remote Network Interaction; Use with the GNU General Public License. + +Notwithstanding any other provision of this License, if you modify the +Program, your modified version must prominently offer all users +interacting with it remotely through a computer network (if your +version supports such interaction) an opportunity to receive the +Corresponding Source of your version by providing access to the +Corresponding Source from a network server at no charge, through some +standard or customary means of facilitating copying of software. This +Corresponding Source shall include the Corresponding Source for any +work covered by version 3 of the GNU General Public License that is +incorporated pursuant to the following paragraph. + +Notwithstanding any other provision of this License, you have +permission to link or combine any covered work with a work licensed +under version 3 of the GNU General Public License into a single +combined work, and to convey the resulting work. The terms of this +License will continue to apply to the part which is the covered work, +but the work with which it is combined will remain governed by version +3 of the GNU General Public License. + +#### 14. Revised Versions of this License. + +The Free Software Foundation may publish revised and/or new versions +of the GNU Affero General Public License from time to time. Such new +versions will be similar in spirit to the present version, but may +differ in detail to address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies that a certain numbered version of the GNU Affero General +Public License "or any later version" applies to it, you have the +option of following the terms and conditions either of that numbered +version or of any later version published by the Free Software +Foundation. If the Program does not specify a version number of the +GNU Affero General Public License, you may choose any version ever +published by the Free Software Foundation. + +If the Program specifies that a proxy can decide which future versions +of the GNU Affero General Public License can be used, that proxy's +public statement of acceptance of a version permanently authorizes you +to choose that version for the Program. + +Later license versions may give you additional or different +permissions. However, no additional obligations are imposed on any +author or copyright holder as a result of your choosing to follow a +later version. + +#### 15. Disclaimer of Warranty. + +THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY +APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT +WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND +PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE +DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR +CORRECTION. + +#### 16. Limitation of Liability. + +IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR +CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES +ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT +NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR +LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM +TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER +PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. + +#### 17. Interpretation of Sections 15 and 16. + +If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + +END OF TERMS AND CONDITIONS + +### How to Apply These Terms to Your New Programs + +If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these +terms. + +To do so, attach the following notices to the program. It is safest to +attach them to the start of each source file to most effectively state +the exclusion of warranty; and each file should have at least the +"copyright" line and a pointer to where the full notice is found. + + <one line to give the program's name and a brief idea of what it does.> + Copyright (C) <year> <name of author> + + 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 <https://www.gnu.org/licenses/>. + +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 <https://www.gnu.org/licenses/>. 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://circumlunar.space:1965/") + print(r.text) + + + diff --git a/gusmobile/__init__.py b/gusmobile/__init__.py @@ -0,0 +1 @@ +from .client import Response, GeminiClient diff --git a/gusmobile/client.py b/gusmobile/client.py @@ -0,0 +1,192 @@ +# client.py +# +# 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 <http://www.gnu.org/licenses/>. + +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 url.host: + 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 = f.read() + + # 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.host, 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, server_hostname=url.host) + 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/setup.py b/setup.py @@ -0,0 +1,29 @@ +import os +from setuptools import setup + + +def read(fname): + return os.open(os.path.join(os.path.dirname(__file__), fname)).read() + + +setup( + name="gusmobile", + version="0.1.0", + author="Jason McBrayer", + author_email="jmcbray@carcosa.net", + description=( + "A simple library for requesting resources using the " "gemini protocol" + ), + license="AGPL3", + keywords="gemini client internet", + url="https://git.carcosa.net/jmcbray/gusmobile/", + 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/__init__.py b/tests/__init__.py diff --git a/tests/context.py b/tests/context.py @@ -0,0 +1,6 @@ +import sys +import os + +sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))) + +import gusmobile