118 lines
5.1 KiB
Python
118 lines
5.1 KiB
Python
from django.contrib import auth
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from django.contrib.auth.models import AbstractUser
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from django.db import models, transaction
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from django.db.utils import IntegrityError
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from nacl.encoding import HexEncoder
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from nacl.exceptions import BadSignatureError
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from nacl.signing import SigningKey, VerifyKey
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class KnownIdentity(models.Model):
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username = models.CharField(max_length=255)
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domain = models.CharField(max_length=255)
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public_key = models.CharField(max_length=255)
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friends = models.ManyToManyField('self', symmetrical=True)
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class Meta:
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unique_together = ('username', 'domain')
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indexes = [
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models.Index(fields=['username', 'domain'], name='identity_idx'),
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]
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def __str__(self):
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return f"{self.username}@{self.domain}"
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def is_authenticated(self):
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return True
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def verify(self, message, signature):
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if len(signature) != 128 or type(signature) != str:
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raise TypeError('Signature must be 128 characters long and a string')
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if type(message) != str:
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raise TypeError('Message must be a string')
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try:
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VerifyKey(bytes.fromhex(self.public_key)).verify(message.encode('utf-8'), bytes.fromhex(signature))
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return True
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except BadSignatureError:
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return False
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class ToolshedUserManager(auth.models.BaseUserManager):
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def create_user(self, username, email, password, **extra_fields):
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domain = extra_fields.pop('domain', 'localhost')
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private_key_hex = extra_fields.pop('private_key', None)
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if private_key_hex and type(private_key_hex) != str:
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raise TypeError('Private key must be a string or no private key must be provided')
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if private_key_hex and len(private_key_hex) != 64:
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raise ValueError('Private key must be 64 characters long or no private key must be provided')
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if private_key_hex and not all(c in '0123456789abcdef' for c in private_key_hex):
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raise ValueError('Private key must be a hexadecimal string or no private key must be provided')
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private_key = SigningKey(bytes.fromhex(private_key_hex)) if private_key_hex else SigningKey.generate()
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public_key = SigningKey(private_key.encode()).verify_key
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extra_fields['private_key'] = private_key.encode(encoder=HexEncoder).decode('utf-8')
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try:
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with transaction.atomic():
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extra_fields['public_identity'] = identity = KnownIdentity.objects.create(
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username=username, domain=domain, public_key=public_key.encode(encoder=HexEncoder).decode('utf-8'))
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except IntegrityError:
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raise ValueError('Username already exists')
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else:
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try:
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with transaction.atomic():
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user = super().create(username=username, email=email, password=password, domain=domain,
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**extra_fields)
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user.save()
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except IntegrityError:
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identity.delete()
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raise ValueError('Username or email already exists')
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else:
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return user
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def create_superuser(self, username, email, password, **extra_fields):
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user = self.create_user(username=username, email=email, password=password, **extra_fields)
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user.is_staff = True
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user.is_superuser = True
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return user
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class ToolshedUser(AbstractUser):
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email = models.EmailField(unique=True)
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domain = models.CharField(max_length=255, default='localhost')
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private_key = models.CharField(max_length=255)
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public_identity = models.ForeignKey(KnownIdentity, on_delete=models.CASCADE, related_name='user')
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objects = ToolshedUserManager()
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class Meta:
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unique_together = [('username', 'domain'), ['email']]
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indexes = [
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models.Index(fields=['username', 'domain'], name='user_idx'),
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]
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def __str__(self):
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return f"{self.username}@{self.domain}"
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@property
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def friends(self):
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return self.public_identity.friends
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def sign(self, message):
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if type(message) != str:
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raise TypeError('Message must be a string')
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private_key = SigningKey(self.private_key.encode(), encoder=HexEncoder)
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return private_key.sign(message.encode('utf-8'), encoder=HexEncoder).signature.decode('utf-8')
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class FriendRequestOutgoing(models.Model):
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secret = models.CharField(max_length=255)
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befriender_user = models.ForeignKey(ToolshedUser, on_delete=models.CASCADE, related_name='friend_requests_outgoing')
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befriendee_username = models.CharField(max_length=255)
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befriendee_domain = models.CharField(max_length=255)
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class FriendRequestIncoming(models.Model):
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secret = models.CharField(max_length=255)
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befriender_username = models.CharField(max_length=255)
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befriender_domain = models.CharField(max_length=255)
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befriender_public_key = models.CharField(max_length=255)
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befriendee_user = models.ForeignKey(ToolshedUser, on_delete=models.CASCADE, related_name='friend_requests_incoming')
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created_at = models.DateTimeField(auto_now_add=True)
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