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from sqlalchemy import Table, Column
from sqlalchemy import Integer, String, Float, ForeignKey, Boolean
from sqlalchemy.dialects.mysql import BLOB, TINYINT
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship, backref
from exc import *
Base = declarative_base()
_SALT_LEN = 16
_TOKEN_LEN = 16
MAX_USERNAME_SIZE = 20
MAX_PASSWORD_SIZE = 20
NOT_A_LAT = NOT_A_LNG = 300
_table_typical_settings = {
'mysql_engine' : 'InnoDB',
'mysql_charset' : 'utf8',
'mysql_auto_increment' : '1'}
class _TableName: # avoid typoes
UserModel = 'users'
LocationInfo = 'location_info'
UserAuth = 'user_auth'
GroupInfo = 'group_info'
GroupSub = 'group_sub'
class GroupInfo(Base):
__tablename__ = _TableName.GroupInfo
__table_args__ = _table_typical_settings
id = Column(Integer, primary_key = True)
subscribers = None
def __init__(self, gid):
self.id = gid
group_sub = Table(_TableName.GroupSub, Base.metadata,
Column('uid', Integer, ForeignKey(_TableName.UserModel + '.id')),
Column('gid', Integer, ForeignKey(_TableName.GroupInfo + '.id')),
mysql_engine = 'InnoDB')
class UserModel(Base):
__tablename__ = _TableName.UserModel
__table_args__ = _table_typical_settings
id = Column(Integer, primary_key = True)
username = Column(String(MAX_USERNAME_SIZE),
unique = True, nullable = False)
nickname = Column(String(MAX_USERNAME_SIZE),
unique = False)
sex = Column(Boolean, nullable = False)
comp_id = Column(Integer)
sec_id = Column(Integer)
perm = Column(TINYINT, nullable = False)
sub = relationship("GroupInfo",
secondary = group_sub,
backref = "subscribers")
location = None
auth = None
@classmethod
def to_gid(self, comp_no, sec_no):
return comp_no * 256 + sec_no
def __init__(self, username, nickname, sex, comp_no, sec_no, perm):
self.username = username
self.nickname = nickname
self.sex = sex
self.comp_id = UserModel.to_gid(comp_no, 0xff)
self.sec_id = UserModel.to_gid(comp_no, sec_no)
self.sub = list()
self.perm = perm
class LocationInfo(Base):
__tablename__ = _TableName.LocationInfo
__table_args__ = _table_typical_settings
uid = Column(Integer, ForeignKey(_TableName.UserModel + '.id'),
primary_key = True)
lat = Column(Float(precesion = 64), nullable = False)
lng = Column(Float(precesion = 64), nullable = False)
user = relationship("UserModel", uselist = False,
backref = backref("location", uselist = False,
cascade = "all, delete-orphan"))
# More: last_update
from hashlib import sha256
from os import urandom
def _sprinkle_salt(uauth, passwd):
data = sha256(uauth.salt)
data.update(chr(0))
data.update(passwd)
return data.digest()
def _random_binary_string(length):
return urandom(length)
class UserAuth(Base):
__tablename__ = _TableName.UserAuth
__table_args__ = _table_typical_settings
uid = Column(Integer, ForeignKey(_TableName.UserModel + '.id'), primary_key = True)
password = Column(BLOB)
salt = Column(BLOB)
token = Column(BLOB)
user = relationship("UserModel", uselist = False,
backref = backref("auth", uselist = False,
cascade = "all, delete-orphan"))
def regen_token(self):
self.token = sha256(_random_binary_string(_TOKEN_LEN)).digest()
def __init__(self, passwd):
self.set_password(passwd)
def set_password(self, passwd):
self.salt = _random_binary_string(_SALT_LEN)
self.password = _sprinkle_salt(self, passwd)
self.regen_token()
def check_password(self, passwd):
passwd = _sprinkle_salt(self, passwd)
return passwd == self.password
def check_token(self, tk):
return self.token == tk
def get_token(self):
return self.token
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