Add initial project structure

This patch adds the initial project structure, including licenses,
linters and their configuration, and a basic test case that ensures that
the module can be loaded.

Most tooling is taken over from pynitrokey.  One notable exception is
that flit is replaced by poetry.  This only affects developers, not end
users.  We recently made the same change in nitrokey-app2 [0], so I
think it makes sense to use the same tooling here.

[0] Nitrokey/nitrokey-app2#172

In the CI builds, we check that both the lockfile and the latest
dependency versions work.  It would good to also run it for the minimum
versions specified in pyproject.toml, but this is currently not
supported by poetry or pip:

python-poetry/poetry#3527
pypa/pip#8085

.flake8

@@ -0,0 +1,7 @@
+[flake8]
+# E203,E701 suggested by black, see:
+# https://black.readthedocs.io/en/stable/guides/using_black_with_other_tools.html#flake8
+# E501 (line length) disabled as this is handled by black which takes better care of edge cases
+extend-ignore = E203,E501,E701
+max-complexity = 18
+extend-exclude = pynitrokey/trussed/bootloader/nrf52_upload

.github/workflows/ci.yaml

@@ -0,0 +1,114 @@
+name: Continuous integration
+on: [push, pull_request]
+
+env:
+  REQUIRED_PACKAGES: make
+
+jobs:
+  format-code:
+    name: Check code format
+    runs-on: ubuntu-latest
+    container: python:3.9-slim
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install required packages
+        run: apt update && apt install -y ${REQUIRED_PACKAGES}
+      - name: Install Poetry
+        run: pip install poetry
+      - name: Create virtual environment
+        run: make install
+      - name: Check code format
+        run: make check-format
+  format-import:
+    name: Check imports sorting
+    runs-on: ubuntu-latest
+    container: python:3.9-slim
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install required packages
+        run: apt update && apt install -y ${REQUIRED_PACKAGES}
+      - name: Install Poetry
+        run: pip install poetry
+      - name: Create virtual environment
+        run: make install
+      - name: Check code import format
+        run: make check-import-sorting
+  lint-style:
+    name: Check code style
+    runs-on: ubuntu-latest
+    container: python:3.9-slim
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install required packages
+        run: apt update && apt install -y ${REQUIRED_PACKAGES}
+      - name: Install Poetry
+        run: pip install poetry
+      - name: Create virtual environment
+        run: make install
+      - name: Check code style
+        run: make check-style
+  lint-typing:
+    name: Check static typing
+    runs-on: ubuntu-latest
+    container: python:3.9-slim
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install required packages
+        run: apt update && apt install -y ${REQUIRED_PACKAGES}
+      - name: Install Poetry
+        run: pip install poetry
+      - name: Create virtual environment
+        run: make install
+      - name: Check code static typing
+        run: make check-typing
+  lint-poetry:
+    name: Check poetry configuration
+    runs-on: ubuntu-latest
+    container: python:3.9-slim
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install required packages
+        run: apt update && apt install -y ${REQUIRED_PACKAGES}
+      - name: Install Poetry
+        run: pip install poetry
+      - name: Create virtual environment
+        run: make install
+      - name: Check poetry configuration
+        run: make check-poetry
+  test:
+    name: Run test suite
+    runs-on: ubuntu-latest
+    container: python:3.9-slim
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install required packages
+        run: apt update && apt install -y ${REQUIRED_PACKAGES}
+      - name: Install Poetry
+        run: pip install poetry
+      - name: Create virtual environment
+        run: make install
+      - name: Run test suite
+        run: make test
+  test-update:
+    name: Run test suite with updated dependencies
+    runs-on: ubuntu-latest
+    container: python:3.9-slim
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Install required packages
+        run: apt update && apt install -y ${REQUIRED_PACKAGES}
+      - name: Install Poetry
+        run: pip install poetry
+      - name: Create virtual environment
+        run: make install
+      - name: Update locked dependencies
+        run: make update
+      - name: Run test suite
+        run: make test

.gitignore

@@ -0,0 +1 @@
+*.pyc

CHANGELOG.md

@@ -0,0 +1,5 @@
+# Changelog
+
+## Unreleased
+
+-

LICENSES/Apache-2.0.txt

@@ -0,0 +1,73 @@
+Apache License
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+http://www.apache.org/licenses/
+
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+
+APPENDIX: How to apply the Apache License to your work.
+
+To apply the Apache License to your work, attach the following boilerplate notice, with the fields enclosed by brackets "[]" replaced with your own identifying information. (Don't include the brackets!)  The text should be enclosed in the appropriate comment syntax for the file format. We also recommend that a file or class name and description of purpose be included on the same "printed page" as the copyright notice for easier identification within third-party archives.
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LICENSES/MIT.txt

@@ -0,0 +1,9 @@
+MIT License
+
+Copyright (c) <year> <copyright holders>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Makefile

@@ -0,0 +1,43 @@
+.PHONY: install
+install:
+	poetry install --sync --with dev
+
+.PHONY: lock
+lock:
+	poetry lock --no-update
+
+.PHONY: update
+update:
+	poetry update --with dev
+
+.PHONY: check
+check: check-format check-import-sorting check-poetry check-style check-typing
+
+.PHONY: check-format
+check-format:
+	poetry run black --check src
+
+.PHONY: check-import-sorting
+check-import-sorting:
+	poetry run isort --check-only src
+
+.PHONY: check-poetry
+check-poetry:
+	poetry check
+
+.PHONY: check-style
+check-style:
+	poetry run flake8 src
+
+.PHONY: check-typing
+check-typing:
+	poetry run mypy src
+
+.PHONY: fix
+fix:
+	poetry run black src
+	poetry run isort src
+
+.PHONY: test
+test:
+	poetry run python -m unittest -v

README.md

@@ -0,0 +1,72 @@
+# Nitrokey Python SDK
+
+The Nitrokey Python SDK can be used to use and configure Nitrokey devices.
+
+## Installation
+
+The Nitrokey Python SDK has not been released yet.
+You can install the current version from GitHub using the following command:
+
+```
+$ pip install "nitrokey @ git+https://github.com/Nitrokey/nitrokey-sdk-py.git"
+```
+
+## Compatibility
+
+The Nitrokey Python SDK currently requires Python 3.9 or later.
+Support for old Python versions may be dropped in minor releases.
+
+## Related Projects
+
+- [pynitrokey](https://github.com/Nitrokey/pynitrokey):
+  A command line interface for the Nitrokey FIDO2, Nitrokey Start, Nitrokey 3 and NetHSM
+- [nitrokey-app2](https://github.com/nitrokey/nitrokey-app2):
+  A graphical application to manage and use Nitrokey 3 devices
+- [nethsm-sdk-py](https://github.com/Nitrokey/nethsm-sdk-py):
+  A client-side Python SDK for NetHSM
+
+## Development
+
+The following software is required for the development of the SDK:
+
+- Python 3.9 or newer
+- [poetry](https://python-poetry.org/)
+- GNU Make
+- git
+
+After checking out the source code from GitHub, you can install the SDK and its dev dependencies into a new virtual environment managed by poetry using `make install`:
+
+```
+$ git clone https://github.com/Nitrokey/nitrokey-sdk-py.git
+$ cd nitrokey-sdk-py
+$ make install
+```
+
+We use multiple checks and linters for this project.
+Use `make check` to run all required checks.
+Some problems can automatically be fixed by running `make fix`.
+
+The SDK also includes minimal tests to ensure that it is installed and loaded correctly.
+Use `make test` to run these tests.
+
+### Dependency Management
+
+We use [poetry](https://python-poetry.org) for dependency management.
+poetry maintains a lockfile with pinned dependency versions that is used for development environments and in CI.
+This lockfile includes the hash of the `pyproject.toml` file, so it needs to be updated if `pyproject.toml` is changed.
+These make targets can be used to invoke poetry for the most common tasks:
+
+- `make install` installs the SDK and its dependencies as specified in the lockfile (must be up-to-date)
+- `make lock` updates the lockfile without changing pinned dependency versions
+- `make update` bumps all dependencies, installs them and updates the lockfile
+
+For more information, see poetry’s documentation on [Managing depencies](https://python-poetry.org/docs/managing-dependencies/) and [Commands](https://python-poetry.org/docs/cli/).
+
+## License
+
+This software is fully open source.
+
+All software, unless otherwise noted, is dual licensed under [Apache 2.0](./LICENSES/Apache-2.0.txt) and [MIT](./LICENSES/MIT.txt).
+You may use the software under the terms of either the Apache 2.0 license or MIT license.
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.