text: from datetime import datetime
  import hashlib
  from werkzeug.security import generate_password_hash, check_password_hash
  from itsdangerous import TimedJSONWebSignatureSerializer as Serializer
  #from markdown import markdown
  import bleach
  from flask import current_app, request
  from flask.ext.login import UserMixin, AnonymousUserMixin
  from . import db, login_manager
  
  
  class Permission:
      FOLLOW = 0x01
      COMMENT = 0x02
      WRITE_ARTICLES = 0x04
      MODERATE_COMMENTS = 0x08
      ADMINISTER = 0x80
  
  
  class Role(db.Model):
      __tablename__ = 'roles'
      id = db.Column(db.Integer, primary_key=True)
      name = db.Column(db.String(64), unique=True)
      default = db.Column(db.Boolean, default=False, index=True)
      permissions = db.Column(db.Integer)
      users = db.relationship('User', backref='role', lazy='dynamic')
  
      @staticmethod
      def insert_roles():
          roles = {
              'User': (Permission.FOLLOW |
                       Permission.COMMENT |
                       Permission.WRITE_ARTICLES, True),
              'Moderator': (Permission.FOLLOW |
                            Permission.COMMENT |
                            Permission.WRITE_ARTICLES |
                            Permission.MODERATE_COMMENTS, False),
              'Administrator': (0xff, False)
          }
          for r in roles:
              role = Role.query.filter_by(name=r).first()
              if role is None:
                  role = Role(name=r)
              role.permissions = roles[r][0]
              role.default = roles[r][1]
              db.session.add(role)
          db.session.commit()
  
      def __repr__(self):
          return '<Role %r>' % self.name
  
  
  class User(UserMixin, db.Model):
      __tablename__ = 'users'
      id = db.Column(db.Integer, primary_key=True)
      email = db.Column(db.String(64), unique=True, index=True)
      username = db.Column(db.String(64), unique=True, index=True)
      role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))
      password_hash = db.Column(db.String(128))
      confirmed = db.Column(db.Boolean, default=False)
      name = db.Column(db.String(64))
      location = db.Column(db.String(64))
      about_me = db.Column(db.Text())
      member_since = db.Column(db.DateTime(), default=datetime.utcnow)
      last_seen = db.Column(db.DateTime(), default=datetime.utcnow)
      avatar_hash = db.Column(db.String(32))
      posts = db.relationship('Post', backref='author', lazy='dynamic')
      updates = db.relationship('Update', backref='author', lazy='dynamic')
  
      @staticmethod
      def generate_fake(count=100):
          from sqlalchemy.exc import IntegrityError
          from random import seed
          import forgery_py
  
          seed()
          for i in range(count):
              u = User(email=forgery_py.internet.email_address(),
                       username=forgery_py.internet.user_name(True),
                       password=forgery_py.lorem_ipsum.word(),
                       confirmed=True,
                       name=forgery_py.name.full_name(),
                       location=forgery_py.address.city(),
                       about_me=forgery_py.lorem_ipsum.sentence(),
                       member_since=forgery_py.date.date(True))
              db.session.add(u)
              try:
                  db.session.commit()
              except IntegrityError:
                  db.session.rollback()
  
      def __init__(self, **kwargs):
          super(User, self).__init__(**kwargs)
          if self.role is None:
              if self.email == current_app.config['FLASKY_ADMIN']:
                  self.role = Role.query.filter_by(permissions=0xff).first()
              if self.role is None:
                  self.role = Role.query.filter_by(default=True).first()
          if self.email is not None and self.avatar_hash is None:
              self.avatar_hash = hashlib.md5(
                  self.email.encode('utf-8')).hexdigest()
  
      @property
      def password(self):
          raise AttributeError('password is not a readable attribute')
  
      @password.setter
      def password(self, password):
          self.password_hash = generate_password_hash(password)
  
      def verify_password(self, password):
          return check_password_hash(self.password_hash, password)
  
      def generate_confirmation_token(self, expiration=3600):
          s = Serializer(current_app.config['SECRET_KEY'], expiration)
          return s.dumps({'confirm': self.id})
  
      def confirm(self, token):
          s = Serializer(current_app.config['SECRET_KEY'])
          try:
              data = s.loads(token)
          except:
              return False
          if data.get('confirm') != self.id:
              return False
          self.confirmed = True
          db.session.add(self)
          return True
  
      def generate_reset_token(self, expiration=3600):
          s = Serializer(current_app.config['SECRET_KEY'], expiration)
          return s.dumps({'reset': self.id})
  
      def reset_password(self, token, new_password):
          s = Serializer(current_app.config['SECRET_KEY'])
          try:
              data = s.loads(token)
          except:
              return False
          if data.get('reset') != self.id:
              return False
          self.password = new_password
          db.session.add(self)
          return True
  
      def generate_email_change_token(self, new_email, expiration=3600):
          s = Serializer(current_app.config['SECRET_KEY'], expiration)
          return s.dumps({'change_email': self.id, 'new_email': new_email})
  
      def change_email(self, token):
          s = Serializer(current_app.config['SECRET_KEY'])
          try:
              data = s.loads(token)
          except:
              return False
          if data.get('change_email') != self.id:
              return False
          new_email = data.get('new_email')
          if new_email is None:
              return False
          if self.query.filter_by(email=new_email).first() is not None:
              return False
          self.email = new_email
          self.avatar_hash = hashlib.md5(
              self.email.encode('utf-8')).hexdigest()
          db.session.add(self)
          return True
  
      def can(self, permissions):
          return self.role is not None and \
              (self.role.permissions & permissions) == permissions
  
      def is_administrator(self):
          return self.can(Permission.ADMINISTER)
  
      def ping(self):
          self.last_seen = datetime.utcnow()
          db.session.add(self)
  
      def gravatar(self, size=100, default='identicon', rating='g'):
          if request.is_secure:
              url = 'https://secure.gravatar.com/avatar'
          else:
              url = 'http://www.gravatar.com/avatar'
          hash = self.avatar_hash or hashlib.md5(
              self.email.encode('utf-8')).hexdigest()
          return '{url}/{hash}?s={size}&d={default}&r={rating}'.format(
              url=url, hash=hash, size=size, default=default, rating=rating)
  
      def __repr__(self):
          return '<User %r>' % self.username
  
  
  class AnonymousUser(AnonymousUserMixin):
      def can(self, permissions):
          return False
  
      def is_administrator(self):
          return False
  
  login_manager.anonymous_user = AnonymousUser
  
  
  @login_manager.user_loader
  def load_user(user_id):
      return User.query.get(int(user_id))
  
  
  class Post(db.Model):
      __tablename__ = 'posts'
      id = db.Column(db.Integer, primary_key=True)
      body = db.Column(db.Text)
      body_html = db.Column(db.Text)
      timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
      author_id = db.Column(db.Integer, db.ForeignKey('users.id'))
      category = db.Column(db.String(24))
      category_id = db.Column(db.Integer, db.ForeignKey('initiatives.id'))
      attachurls = db.Column(db.Text)
      
      @staticmethod
      def generate_fake(count=100):
          from random import seed, randint
          import forgery_py
  
          seed()
          user_count = User.query.count()
          for i in range(count):
              u = User.query.offset(randint(0, user_count - 1)).first()
              p = Post(body=forgery_py.lorem_ipsum.sentences(randint(1, 5)),
                       timestamp=forgery_py.date.date(True),
                       author=u)
              db.session.add(p)
              db.session.commit()
  
      @staticmethod
      def on_changed_body(target, value, oldvalue, initiator):
          allowed_tags = ['a', 'abbr', 'acronym', 'b', 'blockquote', 'code',
                          'em', 'i', 'li', 'ol', 'pre', 'strong', 'ul',
                          'h1', 'h2', 'h3', 'p', 'table', 'tbody', 'tr', 'td', 'border']
          target.body_html = bleach.linkify(bleach.clean(
              value, tags=allowed_tags, strip=True))
  
  db.event.listen(Post.body, 'set', Post.on_changed_body)
  
  class Initiative(db.Model):
      __tablename__ = 'initiatives'
      id = db.Column(db.Integer, primary_key=True)
      name = db.Column(db.String(20), unique=True, index=True)
      body = db.Column(db.Text)
      body_html = db.Column(db.Text)
      timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
      updates = db.relationship('Update', backref='initiative', lazy='dynamic')
      
  class Update(db.Model):
      __tablename__ = 'updates'
      id = db.Column(db.Integer, primary_key=True)
      body = db.Column(db.Text)
      body_html = db.Column(db.Text)
      timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
      author_id = db.Column(db.Integer, db.ForeignKey('users.id'))
      initiative_id = db.Column(db.Integer, db.ForeignKey('initiatives.id'))
      