237 lines
6.8 KiB
Python
237 lines
6.8 KiB
Python
# Eos - Verifiable elections
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# Copyright © 2017 RunasSudo (Yingtong Li)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from eos.core.objects import *
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from eos.core.bigint import *
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from eos.base.workflow import *
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class Answer(EmbeddedObject):
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pass
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class EncryptedAnswer(EmbeddedObject):
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pass
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class NullEncryptedAnswer(EncryptedAnswer):
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answer = EmbeddedObjectField()
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def decrypt(self):
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return None, self.answer
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class Ballot(EmbeddedObject):
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#_id = UUIDField()
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encrypted_answers = EmbeddedObjectListField()
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election_id = UUIDField()
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election_hash = StringField()
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answers = EmbeddedObjectListField(is_hashed=False) # Used for ballots to be audited
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def deaudit(self):
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encrypted_answers_deaudit = EosList()
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for encrypted_answer in self.encrypted_answers:
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encrypted_answers_deaudit.append(encrypted_answer.deaudit())
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return Ballot(encrypted_answers=encrypted_answers_deaudit, election_id=self.election_id, election_hash=self.election_hash)
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class Vote(EmbeddedObject):
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_ver = StringField(default='0.5')
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ballot = EmbeddedObjectField()
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cast_at = DateTimeField()
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comment = StringField()
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cast_ip = StringField(is_protected=True)
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cast_fingerprint = BlobField(is_protected=True)
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class Voter(EmbeddedObject):
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_id = UUIDField()
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votes = EmbeddedObjectListField()
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class User(EmbeddedObject):
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admins = []
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def matched_by(self, other):
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return self == other
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def is_admin(self):
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for admin in User.admins:
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if admin.matched_by(self):
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return True
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return False
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def generate_password():
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if is_python:
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#__pragma__('skip')
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import random
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return ''.join(random.SystemRandom().choices('23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz', k=12))
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#__pragma__('noskip')
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else:
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return None
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class EmailUser(User):
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name = StringField()
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email = StringField(is_protected=True)
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password = StringField(is_protected=True, default=generate_password)
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def matched_by(self, other):
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if not isinstance(other, EmailUser):
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return False
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return self.email.lower() == other.email.lower() and self.password == other.password
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def send_email(self, host, port, username, password, from_email, content):
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#__pragma__('skip')
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import smtplib
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#__pragma__('noskip')
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with smtplib.SMTP(host, port) as smtp:
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if username is not None:
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smtp.login(username, password)
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smtp.sendmail(from_email, [self.email], content)
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def email_password(self, host, port, username, password, from_email):
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self.send_email(host, port, username, password, from_email, 'Subject: Registered to vote in {1}\nFrom: {4}\nTo: {2}\n\nDear {0},\n\nYou are registered to vote in the election {1}. Your log in details are as follows:\n\nEmail: {2}\nPassword: {3}'.format(self.name, self.recurse_parents(Election).name, self.email, self.password, from_email))
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class UserVoter(Voter):
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user = EmbeddedObjectField()
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@property
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def name(self):
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return self.user.name
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class Question(EmbeddedObject):
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prompt = StringField()
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class Result(EmbeddedObject):
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pass
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class ListChoiceQuestion(Question):
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_ver = StringField(default='0.5')
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choices = EmbeddedObjectListField()
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min_choices = IntField()
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max_choices = IntField()
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randomise_choices = BooleanField(default=False)
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def pretty_answer(self, answer):
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if len(answer.choices) == 0:
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return '(blank votes)'
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flat_choices = self.flatten_choices()
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return ', '.join([flat_choices[choice].name for choice in answer.choices])
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def max_bits(self):
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answer = self.answer_type(choices=list(range(self.max_choices)))
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return len(EosObject.to_json(EosObject.serialise_and_wrap(answer))) * 8
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def flatten_choices(self):
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# Return a flat list of Choices, without Tickets
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flat_choices = []
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for choice in self.choices:
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if isinstance(choice, Ticket):
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for choice2 in choice.choices:
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flat_choices.append(choice2)
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else:
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flat_choices.append(choice)
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return flat_choices
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def randomised_choices(self):
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if not self.randomise_choices:
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return self.choices
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else:
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# Clone list
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output = EosList([x for x in self.choices])
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# Fisher-Yates shuffle
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i = len(output)
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while i != 0:
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rnd = BigInt.noncrypto_random(0, i - 1)
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rnd = rnd.__int__()
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i -= 1
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output[rnd], output[i] = output[i], output[rnd]
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return output
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class ApprovalAnswer(Answer):
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choices = ListField(IntField())
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class ApprovalQuestion(ListChoiceQuestion):
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answer_type = ApprovalAnswer
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class PreferentialAnswer(Answer):
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choices = ListField(IntField())
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class PreferentialQuestion(ListChoiceQuestion):
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answer_type = PreferentialAnswer
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class Choice(EmbeddedObject):
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name = StringField()
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party = StringField(default=None)
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@property
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def party_or_ticket(self):
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if self.party is not None:
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return self.party
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else:
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ticket = self.recurse_parents(Ticket)
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if ticket:
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return ticket.name
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return None
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class Ticket(EmbeddedObject):
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name = StringField()
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choices = EmbeddedObjectListField()
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class RawResult(Result):
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plaintexts = ListField(EmbeddedObjectListField())
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answers = EmbeddedObjectListField()
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def count(self):
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combined = []
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for answer in self.answers:
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index = next((i for i, val in enumerate(combined) if val[0] == answer), None)
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if index is None:
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combined.append([answer, 1])
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else:
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combined[index][1] += 1
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combined.sort(key=lambda x: x[1], reverse=True)
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return combined
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class MultipleResult(Result):
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results = EmbeddedObjectListField()
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class STVResult(Result):
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elected = ListField(IntField())
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log = StringField()
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random = BlobField()
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class Election(TopLevelObject):
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_id = UUIDField()
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workflow = EmbeddedObjectField(Workflow) # Once saved, we don't care what kind of workflow it is
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name = StringField()
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kind = StringField(default='election')
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voters = EmbeddedObjectListField(is_hashed=False)
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questions = EmbeddedObjectListField()
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results = EmbeddedObjectListField(is_hashed=False)
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def verify(self):
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#__pragma__('skip')
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from eos.core.hashing import SHA256
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#__pragma__('noskip')
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election_hash = SHA256().update_obj(self).hash_as_b64()
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for voter in self.voters:
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for vote in voter.votes:
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if vote.ballot.election_id != self._id:
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raise Exception('Invalid election ID on ballot')
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if vote.ballot.election_hash != election_hash:
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raise Exception('Invalid election hash on ballot')
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