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Initial version with identity handling

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Gergely Polonkai 2022-04-11 15:45:45 +02:00
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[run]
branch = True
[report]
fail_under = 100
show_missing = true
skip_covered = true

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/.coverage

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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright © 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.
This version of the GNU Lesser General Public License incorporates the terms and conditions of version 3 of the GNU General Public License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, “this License” refers to version 3 of the GNU Lesser General Public License, and the “GNU GPL” refers to version 3 of the GNU General Public License.
“The Library” refers to a covered work governed by this License, other than an Application or a Combined Work as defined below.
An “Application” is any work that makes use of an interface provided by the Library, but which is not otherwise based on the Library. Defining a subclass of a class defined by the Library is deemed a mode of using an interface provided by the Library.
A “Combined Work” is a work produced by combining or linking an Application with the Library. The particular version of the Library with which the Combined Work was made is also called the “Linked Version”.
The “Minimal Corresponding Source” for a Combined Work means the Corresponding Source for the Combined Work, excluding any source code for portions of the Combined Work that, considered in isolation, are based on the Application, and not on the Linked Version.
The “Corresponding Application Code” for a Combined Work means the object code and/or source code for the Application, including any data and utility programs needed for reproducing the Combined Work from the Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a facility refers to a function or data to be supplied by an Application that uses the facility (other than as an argument passed when the facility is invoked), then you may convey a copy of the modified version:
a) under this License, provided that you make a good faith effort to ensure that, in the event an Application does not supply the function or data, the facility still operates, and performs whatever part of its purpose remains meaningful, or
b) under the GNU GPL, with none of the additional permissions of this License applicable to that copy.
3. Object Code Incorporating Material from Library Header Files.
The object code form of an Application may incorporate material from a header file that is part of the Library. You may convey such object code under terms of your choice, provided that, if the incorporated material is not limited to numerical parameters, data structure layouts and accessors, or small macros, inline functions and templates (ten or fewer lines in length), you do both of the following:
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You may convey a Combined Work under terms of your choice that, taken together, effectively do not restrict modification of the portions of the Library contained in the Combined Work and reverse engineering for debugging such modifications, if you also do each of the following:
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1) Use a suitable shared library mechanism for linking with the Library. A suitable mechanism is one that (a) uses at run time a copy of the Library already present on the user's computer system, and (b) will operate properly with a modified version of the Library that is interface-compatible with the Linked Version.
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6. Revised Versions of the GNU Lesser General Public License.
The Free Software Foundation may publish revised and/or new versions of the GNU Lesser 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 Library as you received it specifies that a certain numbered version of the GNU Lesser General Public License “or any later version” applies to it, you have the option of following the terms and conditions either of that published version or of any later version published by the Free Software Foundation. If the Library as you received it does not specify a version number of the GNU Lesser General Public License, you may choose any version of the GNU Lesser General Public License ever published by the Free Software Foundation.
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Python implementation of Earthstar
##################################
**WARNING!**
This library is very limited in functionality, and is under active development. Be prepared for
things to break.
Usage
=====
Create an identity and save it as a mnemonic:
.. code-block:: python
from earthsnake import Identity
identity = Identity('test')
mnemonic = identity.mnemonic
Then you can load it back from the mnemonic:
.. code-block:: python
identity = Identity.from_mnemonic(mnemonic)
Development
===========
Type checking:
.. code-block:: sh
env MYPYPATH=mypy-stubs poetry run mypy --strict earthsnake tests
Static linting:
.. code-block:: sh
poetry run pylint earthsnake tests
Tests:
.. code-block:: sh
poetry run pytest -vv --cov=. tests

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"""Earthsnake - An Earthstar implementation in Python
##################################################
Usage example
=============
.. code-block:: python
import earthsnake
identity = earthsnake.Identity('test')
mnemonic = identity.mnemonic
"""
__version__ = '0.1.0'
from .identity import Identity

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"""Base32 encoding/decoding
For base32 encoding we use rfc4648, no padding, lowercase, prefixed with "b".
Base32 character set: 'abcdefghijklmnopqrstuvwxyz234567'
The Multibase format adds a "b" prefix to specify this particular encoding.
We leave the "b" prefix there because we don't want the encoded string
to start with a number (so we can use it as a URL location).
When decoding, we require it to start with a "b" -- no other multibase formats are allowed.
The decoding must be strict (it doesn't allow a 1 in place of an i, etc).
"""
from base64 import b32decode, b32encode
def base32_bytes_to_string(bytes_: bytes) -> str:
"""Encode uint8array bytes to base32 string"""
return 'b' + b32encode(bytes_).lower().strip(b'=').decode('utf-8')
def base32_string_to_bytes(string: str) -> bytes:
"""Decode base32 string to a uint8array of bytes
:raises ValidationError: if the string is bad
"""
if not string.startswith("b"):
raise ValueError(
f"can't decode base32 string - it should start with a 'b'. {str}"
)
string = string[1:]
# this library combines padding and looseness settings into a single "loose" option, so
# we have to set "loose: true" in order to handle unpadded inputs.
# with a custom codec, loose mode:
# -- allows padding or no padding -- we have to check for this
# -- does not allow uppercase -- good
# -- does not allow 1/i substitution -- good
# make sure no padding characters are on the end
if string.endswith("="):
raise ValueError(
"can't decode base32 string - it contains padding characters ('=')"
)
pad_length = 8 - len(string) % 8
string += '=' * pad_length
return b32decode(string.upper())

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"""Exception types for Earthsnake
"""
class EarthsnakeError(Exception):
"""Basic Earthsnake error
Should not be used except as a base type.
"""
class ValidationError(EarthsnakeError):
"""Raised when something doesn’t pass as a valid Earthsnake object
"""

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"""Identity management"""
import re
from typing import Optional
import bip39
from ed25519 import SigningKey, VerifyingKey, create_keypair
from .base32 import base32_bytes_to_string, base32_string_to_bytes
from .exc import ValidationError
from .types import ALPHA_LOWER, ALPHA_LOWER_OR_DIGIT, B32_CHAR
class Identity:
"""Class representing and Earthstar identity
.. code-block:: python
identity = Identity()
mnemonic = identity.mnemonic
identity = Identity.from_mnemonic(mnemonic)
"""
_KEY_PATTERN = f'b[{B32_CHAR}]{{52}}'
_NAME_PATTERN = f'[{ALPHA_LOWER}][{ALPHA_LOWER_OR_DIGIT}]{{3}}'
_PATTERN = f'^@{_NAME_PATTERN}\\.{_KEY_PATTERN}$'
_SECRET_PATTERN = f'^{_KEY_PATTERN}$'
def __init__(
self,
name: str,
verify_key: Optional[VerifyingKey] = None,
sign_key: Optional[SigningKey] = None,
) -> None:
if not self.valid_name(name):
raise ValidationError(f'Invalid name: {name}')
if (
sign_key
and verify_key
and sign_key.get_verifying_key().to_bytes() != verify_key.to_bytes()
):
raise ValidationError('Signing and verifying keys don’t match')
if sign_key and not verify_key:
verify_key = sign_key.get_verifying_key()
if not verify_key:
raise ValidationError('At least verify_key must be present')
self.name = name
self.verify_key = verify_key
self.sign_key = sign_key
def __str__(self) -> str:
return f'@{self.name}.{base32_bytes_to_string(self.verify_key.to_bytes())}'
def __repr__(self) -> str:
return f'<Identity {self}>'
@classmethod
def from_address(cls, address: str) -> 'Identity':
"""Load an identity from an author address"""
if not cls.valid_address(address):
raise ValidationError(f'Invalid address {address}')
address = address[1:]
name, verify_key_data = address.split('.')
verify_key_bytes = base32_string_to_bytes(verify_key_data)
verify_key = VerifyingKey(verify_key_bytes)
return cls(name, verify_key=verify_key)
@classmethod
def valid_name(cls, name: str) -> bool:
"""Validate an address’ name part"""
return bool(re.match(f'^{cls._NAME_PATTERN}$', name))
@classmethod
def valid_address(cls, address: str) -> bool:
"""Validate an author address"""
if not address.startswith('@'):
return False
address = address[1:]
try:
name, verify_key_data = address.split('.')
except ValueError:
return False
try:
verify_key_bytes = base32_string_to_bytes(verify_key_data)
VerifyingKey(verify_key_bytes)
except BaseException: # pylint: disable=broad-except
return False
return cls.valid_name(name)
@classmethod
def generate(cls, name: str) -> 'Identity':
"""Generate a new entity"""
sign_key, verify_key = create_keypair()
return cls(name, verify_key=verify_key, sign_key=sign_key)
@classmethod
def from_mnemonic(cls, mnemonic: str) -> 'Identity':
"""Load an identity from a mnemonic"""
name, mnemonic = mnemonic.split(' ', 1)
seed = bip39.decode_phrase(mnemonic)
sign_key = SigningKey(seed)
return cls(name, sign_key=sign_key)
@property
def mnemonic(self) -> Optional[str]:
"""Convert the identify to a BIP39 mnemonic
If the identity doesn’t have a stored signing (secret) key, it returns None."""
if self.sign_key is None:
return None
seed = self.sign_key.to_seed()
mnemonic = bip39.encode_bytes(seed)
return f'{self.name} {mnemonic}'

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"""Generic types and definitions
"""
ALPHA_LOWER = 'abcdefghijklmnopqrstuvwxyz'
DIGIT = '0123456789'
B32_CHAR = ALPHA_LOWER + '234567'
ALPHA_LOWER_OR_DIGIT = ALPHA_LOWER + DIGIT

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from .keys import (
BadSignatureError,
BadPrefixError,
create_keypair,
SigningKey,
VerifyingKey,
remove_prefix,
to_ascii,
from_ascii,
)
__all__ = (
'BadSignatureError',
'BadPrefixError',
'create_keypair',
'SigningKey',
'VerifyingKey',
'remove_prefix',
'to_ascii',
'from_ascii',
'__version__'
)

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version_json: str
def get_versions(): ...

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from typing import Any, Callable, Optional, Tuple
BadSignatureError: Any
def create_keypair(entropy: Callable[[int], bytes] = ...) -> Tuple[SigningKey, VerifyingKey]: ...
class BadPrefixError(Exception): ...
def remove_prefix(s_bytes: bytes, prefix: bytes) -> bytes: ...
def to_ascii(s_bytes: bytes, prefix: str = ..., encoding: str = ...) -> str: ...
def from_ascii(s_ascii: str, prefix: str = ..., encoding: str = ...) -> bytes: ...
class SigningKey:
sk_s: bytes
vk_s: bytes
def __init__(self, sk_s: bytes, prefix: str = ..., encoding: Optional[str] = ...) -> None: ...
def to_bytes(self, prefix: str = ...) -> bytes: ...
def to_ascii(self, prefix: str = ..., encoding: Optional[str] = ...) -> str: ...
def to_seed(self, prefix: str = ...) -> bytes: ...
def __eq__(self, them: object) -> bool: ...
def get_verifying_key(self) -> VerifyingKey: ...
def sign(self, msg: bytes, prefix: str = ..., encoding: Optional[str] = ...) -> bytes: ...
class VerifyingKey:
vk_s: bytes
def __init__(self, vk_s: bytes, prefix: str = ..., encoding: Optional[str] = ...) -> None: ...
def to_bytes(self, prefix: str = ...) -> bytes: ...
def to_ascii(self, prefix: str = ..., encoding: Optional[str] = ...) -> str: ...
def __eq__(self, them: object) -> bool: ...
def verify(self, sig: bytes, msg: bytes, prefix: str = ..., encoding: Optional[str] = ...) -> bool: ...
def selftest() -> None: ...

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28
pyproject.toml Normal file
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[tool.poetry]
name = "earthsnake"
version = "0.1.0"
description = ""
authors = ["Gergely Polonkai <gergely@polonkai.eu>"]
[tool.poetry.dependencies]
python = "^3.10"
ed25519 = "^1.5"
bip39 = "^0.0.2"
[tool.poetry.dev-dependencies]
pytest = "^7.1.1"
pylint = "^2.13.5"
pytest-mock = "^3.7.0"
black = "^22.3.0"
mypy = "^0.942"
pytest-cov = "^3.0.0"
[tool.pytest.ini_options]
markers = [
"id_key_seed: seed to create an identity secret from",
"id_name: the name to use in the identity"
]
[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

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tests/__init__.py Normal file
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30
tests/conftest.py Normal file
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"""Test configuration and global fixtures
"""
from ed25519 import SigningKey
import pytest
from _pytest.fixtures import SubRequest
from earthsnake.identity import Identity
from .helpers import random_name
@pytest.fixture
def identity(request: SubRequest) -> Identity:
"""A valid identity"""
seed = b''
name = random_name()
for marker in request.node.iter_markers('id_key_seed'):
for seed in marker.args:
pass
for marker in request.node.iter_markers('id_name'):
for name in marker.args:
pass
sign = SigningKey(seed)
return Identity(name, sign_key=sign)

12
tests/helpers.py Normal file
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"""Helper functions for tests
"""
from random import choice
from earthsnake.types import ALPHA_LOWER, ALPHA_LOWER_OR_DIGIT
def random_name() -> str:
"""Generate a valid random author name"""
return choice(ALPHA_LOWER) + ''.join(choice(ALPHA_LOWER_OR_DIGIT) for _ in range(3))

56
tests/test_base32.py Normal file
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"""Tests for the base32 encode/decode utilities
"""
from base64 import _b32decode, _b32encode # type: ignore
from base64 import b32decode, b32encode
from random import choice
import pytest
from earthsnake.base32 import base32_bytes_to_string, base32_string_to_bytes
from earthsnake.types import B32_CHAR
def test_alphabet() -> None:
"""Test if Python’s Base32 alphabet is the uppercase version of the one we expect"""
alphabet = B32_CHAR.encode('utf-8')
test_data = b'\x00D2\x14\xc7BT\xb65\xcf\x84e:V\xd7\xc6u\xbew\xdf'
test_encoded = B32_CHAR.upper().encode('utf-8')
assert _b32encode(alphabet, test_data) == b32encode(test_data).lower()
assert _b32decode(alphabet, alphabet) == b32decode(test_encoded)
def test_bytes_to_string() -> None:
"""Test if base32_bytes_to_string encodes bytes as expected"""
data = bytes(choice(range(255)) for _ in range(10))
our_version = base32_bytes_to_string(data)
py_version = 'b' + b32encode(data).lower().strip(b'=').decode('utf-8')
assert our_version == py_version
def test_string_to_bytes_noprefix() -> None:
"""Test if base32_string_to_bytes refuses to decode strings without the 'b' prefix"""
with pytest.raises(ValueError) as ctx:
base32_string_to_bytes('test')
assert 'it should start with a \'b\'' in str(ctx.value)
def test_string_to_bytes_padding() -> None:
"""Test if base32_string_to_bytes refuses to decode strings with padding characters"""
with pytest.raises(ValueError) as ctx:
base32_string_to_bytes('btest=')
assert 'it contains padding characters (\'=\')' in str(ctx.value)
def test_string_to_bytes() -> None:
"""Test if base32_string_to_bytes dedoces strings as expected"""
assert base32_string_to_bytes('borsxg5a') == b'test'

185
tests/test_identity.py Normal file
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"""Tests for the Identity class
"""
import bip39
from ed25519 import SigningKey, create_keypair
import pytest
from pytest_mock.plugin import MockerFixture
from earthsnake.exc import ValidationError
from earthsnake.identity import Identity
from .helpers import random_name
TEST_SEED = (
b'\xe5:\xc9\x95$\x9d\xc5F\xee\xe6\x84\xbe\xcc\xda^\xc4'
b'z\x84\xb7\xd2\x02q\xfa\xe8W\xd8z\x05E\xfb2\xd5'
)
TEST_MNEMONIC = bip39.encode_bytes(TEST_SEED)
@pytest.mark.parametrize(
'name',
[
pytest.param('s', id='veryshort'),
pytest.param('sho', id='short'),
pytest.param('longy', id='long'),
pytest.param('verylong', id='verylong'),
pytest.param('0num', id='numberstart'),
],
)
def test_init_bad_name(name: str) -> None:
"""Test if initialisation is not possible with an invalid name"""
sign, verify = create_keypair()
with pytest.raises(ValidationError) as ctx:
Identity(name, verify_key=verify, sign_key=sign)
assert 'Invalid name' in str(ctx.value)
def test_init_key_mismatch() -> None:
"""Test if initialisation fails if the signing and verifying keys don’t match"""
sign1, _ = create_keypair()
_, verify2 = create_keypair()
with pytest.raises(ValidationError) as ctx:
Identity('name', verify_key=verify2, sign_key=sign1)
assert 'Signing and verifying keys don’t match' in str(ctx.value)
def test_init_no_keys() -> None:
"""Test if initialisation is not possible without keys"""
with pytest.raises(ValidationError) as ctx:
Identity('name')
assert 'At least verify_key must be present' in str(ctx.value)
@pytest.mark.id_key_seed(TEST_SEED)
@pytest.mark.id_name('test')
def test_str(identity: Identity) -> None:
"""Test if the __str__ method returns the author address"""
assert (
str(identity) == '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
)
@pytest.mark.id_key_seed(TEST_SEED)
@pytest.mark.id_name('test')
def test_repr(identity: Identity) -> None:
"""Test if the __str__ method returns the author address"""
assert (
repr(identity) == '<Identity @test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya>'
)
def test_from_address() -> None:
"""Test loading an identity from an author address"""
skey = SigningKey(TEST_SEED)
vkey = skey.get_verifying_key()
identity = Identity.from_address(
'@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
)
assert identity.name == 'test'
assert identity.sign_key is None
assert identity.verify_key.to_bytes() == vkey.to_bytes()
def test_from_invalid_address() -> None:
"""Test loading an identity from an invalid address"""
with pytest.raises(ValidationError) as ctx:
Identity.from_address('@inva.lid')
assert 'Invalid address @inva.lid' in str(ctx.value)
def test_generate(mocker: MockerFixture) -> None:
"""Test the generate property"""
skey = SigningKey(TEST_SEED)
vkey = skey.get_verifying_key()
mocker.patch('earthsnake.identity.create_keypair', return_value=(skey, vkey))
identity = Identity.generate('test')
assert (
str(identity) == '@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
)
assert identity.sign_key
assert identity.verify_key
assert identity.name == 'test'
@pytest.mark.id_key_seed(TEST_SEED)
@pytest.mark.id_name('test')
def test_mnemonic(identity: Identity) -> None:
"""Test the mnemonic property"""
assert identity.mnemonic == f'test {TEST_MNEMONIC}'
def test_mnemonic_no_signing_key() -> None:
"""Test if the mnemonic property returns None if there is no signing key"""
identity = Identity.from_address(
'@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
)
assert identity.mnemonic is None
def test_from_mnemonic() -> None:
"""Test if identities can be loaded from mnemonics"""
name = random_name()
identity = Identity.from_mnemonic(f'{name} {TEST_MNEMONIC}')
assert identity.name == name
assert identity.sign_key
assert identity.sign_key.to_seed() == TEST_SEED
assert (
str(identity)
== f'@{name}.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
)
@pytest.mark.parametrize(
'address',
[
pytest.param(
'noat.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya', id='no_at'
),
pytest.param(
'@toolong.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
id='too_long',
),
pytest.param('@test.invalidkey', id='invalid_key'),
pytest.param(
'@test.cz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya',
id='nonprefixed_key',
),
pytest.param('@test.many.periods', id='many_periods'),
],
)
def test_valid_address_invalid(address: str) -> None:
"""Test if valid_address fails for invalid addresses"""
assert Identity.valid_address(address) is False
def test_valid_address() -> None:
"""Test if valid_address passes on valid addresses"""
assert Identity.valid_address(
'@test.bcz76z52y5dlpohtkmpuj3jsdcvfmebzpcgfmtmhu4u7hlexzreya'
)