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.vscode
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LICENSE
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6
MANIFEST.in
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include *.in
include *.py
include LICENSE
include tox.ini
include requirements.txt
recursive-include tests *.py

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README.md
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# Synapse Mozilla SAML MXID Mapper
Custom SAML auth response -> MXID mapping algorithm used during the Mozilla
Matrix trial run.
## Installation
This plugin can be installed via [PyPi](https://pypi.org):
```
pip install matrix-synapse-saml-moz
```
## Usage
Example synapse config:
```yaml
saml2_config:
mapping_provider: "saml_mapping_provider.SamlMappingProvider"
```
## Development and Testing
This repository uses `tox` to run linting and tests.
### Linting code
Code is linted with the `flake8` tool. Run `tox -e pep8` to check for linting
errors in the codebase.
### Tests
This repository uses `unittest` to run the tests located in the `tests`
directory. They can be ran with `tox -e tests`.

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requirements.txt
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-e .

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saml_mapping_provider.py
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# -*- coding: utf-8 -*-
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# 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 re
import string
__version__ = "0.0.1"
class SamlMappingProvider(object):
def __init__(self):
mxid_localpart_allowed_characters = set(
"_-./=" + string.ascii_lowercase + string.digits
)
self._dot_replace_pattern = re.compile(
("[^%s]" % (re.escape("".join(mxid_localpart_allowed_characters)),))
)
self._multiple_to_single_dot_pattern = re.compile(r"\.{2,}")
self._string_end_dot_pattern = re.compile(r"\.$")
def mxid_source_to_mxid_localpart(self, mxid_source: str, failures: int = 0) -> str:
"""Maps some text from a SAML response to the localpart of a new mxid
Args:
mxid_source (str): The input text from a SAML auth response
failures (int): How many times a call to this function with this
mxid_source has resulted in a failure (possibly due to the localpart
already existing)
Returns:
str: The localpart of a new mxid
"""
# Truncate the username to the first found '@' character to prevent complete
# emails being leaked
pos = mxid_source.find("@")
if pos >= 0:
mxid_source = mxid_source[:pos]
mxid_localpart = self._dotreplace_for_mxid(mxid_source)
# Append suffix integer if last call to this function failed to produce
# a usable mxid
return mxid_localpart + (str(failures) if failures else "")
def _dotreplace_for_mxid(self, username: str) -> str:
"""Replace non-allowed mxid characters with a '.'
Args:
username (str): The username to process
Returns:
str: The processed username
"""
username = username.lower()
username = self._dot_replace_pattern.sub(".", username)
# regular mxids aren't allowed to start with an underscore either
username = re.sub("^_", "", username)
# Change all instances of multiple dots together into a single dot
username = self._multiple_to_single_dot_pattern.sub(".", username)
# Remove any trailing dots
username = self._string_end_dot_pattern.sub("", username)
return username

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setup.cfg
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[flake8]
max-line-length = 90
# W503 requires that binary operators be at the end, not start, of lines. Erik doesn't like it.
ignore = W503

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setup.py
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#!/usr/bin/env python
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# 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.
from setuptools import setup
from codecs import open
import os
here = os.path.abspath(os.path.dirname(__file__))
def read_file(path_segments):
"""Read a UTF-8 file from the package. Takes a list of strings to join to
make the path"""
file_path = os.path.join(here, *path_segments)
with open(file_path, encoding="utf-8") as f:
return f.read()
def exec_file(path_segments, name):
"""Extract a constant from a python file by looking for a line defining
the constant and executing it."""
result = {}
code = read_file(path_segments)
lines = [line for line in code.split('\n') if line.startswith(name)]
exec("\n".join(lines), result)
return result[name]
setup(
name="matrix-synapse-saml-moz",
version=exec_file(("saml_mapping_provider.py",), "__version__"),
py_modules=["matrix-synapse-saml-moz"],
description="An Mozilla-flavoured SAML MXID mapper for Synapse",
install_requires=[],
long_description=read_file(("README.md",)),
classifiers=[
'Development Status :: 4 - Beta',
'License :: OSI Approved :: Apache Software License',
'Programming Language :: Python :: 3',
],
)

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tests/__init__.py
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from saml_mapping_provider import SamlMappingProvider
def create_mapping_provider() -> SamlMappingProvider:
return SamlMappingProvider()

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tests/test_username.py
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# -*- coding: utf-8 -*-
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# 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 logging
import unittest
from . import create_mapping_provider
logging.basicConfig()
class SamlUsernameTestCase(unittest.TestCase):
def test_normal_user(self):
provider = create_mapping_provider()
username = "john*doe2000#@example.com"
localpart = provider.mxid_source_to_mxid_localpart(username)
self.assertEqual(localpart, "john.doe2000")
def test_multiple_adjacent_symbols(self):
provider = create_mapping_provider()
username = "bob%^$&#!bobby@example.com"
localpart = provider.mxid_source_to_mxid_localpart(username)
self.assertEqual(localpart, "bob.bobby")
def test_username_does_not_end_with_dot(self):
"""This is allowed in mxid syntax, but is not aesthetically pleasing"""
provider = create_mapping_provider()
username = "bob.bobby$@example.com"
localpart = provider.mxid_source_to_mxid_localpart(username)
self.assertEqual(localpart, "bob.bobby")
def test_username_no_email(self):
provider = create_mapping_provider()
username = "bob.bobby"
localpart = provider.mxid_source_to_mxid_localpart(username)
self.assertEqual(localpart, "bob.bobby")
def test_username_starting_with_underscore(self):
provider = create_mapping_provider()
username = "_twilight (sparkle)@somewhere.com"
localpart = provider.mxid_source_to_mxid_localpart(username)
self.assertEqual(localpart, "twilight.sparkle")
def test_existing_user(self):
provider = create_mapping_provider()
username = "wibble%@wobble.com"
localpart = provider.mxid_source_to_mxid_localpart(username)
# Simulate a failure on the first attempt
localpart = provider.mxid_source_to_mxid_localpart(username, failures=1)
self.assertEqual(localpart, "wibble1")

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tox.ini
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[tox]
envlist = packaging, pep8
[testenv]
setenv =
PYTHONDONTWRITEBYTECODE = no_byte_code
PYTHONPATH = .
[testenv:tests]
commands =
python -m unittest discover
[testenv:packaging]
deps =
check-manifest
commands =
check-manifest
[testenv:pep8]
skip_install = True
basepython = python3
deps =
flake8
commands =
flake8 saml_mapping_provider.py tests/*
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