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 itsdangerous import BadSignature from flask import current_app from flask_login import UserMixin, AnonymousUserMixin from . import db, login_manager class Permission: FOLLOW = 1 COMMENT = 2 WRITE = 4 MODERATE = 8 ADMIN = 16 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') def __init__(self, **kwargs): super(Role, self).__init__(**kwargs) if self.permissions is None: self.permissions = 0 @staticmethod def insert_roles(): roles = { 'User': [Permission.FOLLOW, Permission.COMMENT, Permission.WRITE], 'Moderator': [Permission.FOLLOW, Permission.COMMENT, Permission.WRITE, Permission.MODERATE], 'Administrator': [Permission.FOLLOW, Permission.COMMENT, Permission.WRITE, Permission.MODERATE, Permission.ADMIN] } default_role = 'User' for r in roles: role = Role.query.filter_by(name=r).first() if role is None: role = Role(name=r) role.reset_permissions() for perm in roles[r]: role.add_permission(perm) role.default = (role.name == default_role) db.session.add(role) db.session.commit() def add_permission(self, perm): if not self.has_permission(perm): self.permissions += perm def remove_permission(self, perm): if self.has_permission(perm): self.permissions -= perm def reset_permissions(self): self.permissions = 0 def has_permission(self, perm): return self.permissions & perm == perm def __repr__(self): return '' % self.name class Follow(db.Model): __tablename__ = 'follows' follower_id = db.Column(db.Integer, db.ForeignKey('users.id'), primary_key=True) followed_id = db.Column(db.Integer, db.ForeignKey('users.id'), primary_key=True) timestamp = db.Column(db.DateTime, default=datetime.utcnow) 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') followed = db.relationship('Follow', foreign_keys=[Follow.follower_id], backref=db.backref('follower', lazy='joined'), lazy='dynamic', cascade='all, delete-orphan') followers = db.relationship('Follow', foreign_keys=[Follow.followed_id], backref=db.backref('followed', lazy='joined'), lazy='dynamic', cascade='all, delete-orphan') 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(name='Administrator').first() else: self.role = Role.query.filter_by(default=True).first() if self.email is not None and self.avatar_hash is None: self.avatar_hash = self.gravatar_hash() @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}).decode('utf-8') def confirm(self, token): s = Serializer(current_app.config['SECRET_KEY']) try: data = s.loads(token.encode('utf-8')) except BadSignature: 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}).decode('utf-8') @staticmethod def reset_password(token, new_password): s = Serializer(current_app.config['SECRET_KEY']) try: data = s.loads(token.encode('utf-8')) except BadSignature: return False user = User.query.get(data.get('reset')) if user is None: return False user.password = new_password db.session.add(user) 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}).decode('utf-8') def change_email(self, token): s = Serializer(current_app.config['SECRET_KEY']) try: data = s.loads(token.encode('utf-8')) except BadSignature: 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.gravatar_hash = self.gravatar_hash() db.session.add(self) return True def can(self, perm): return self.role is not None and self.role.has_permission(perm) def is_administrator(self): return self.can(Permission.ADMIN) def ping(self): self.last_seen = datetime.utcnow() db.session.add(self) db.session.commit() def gravatar_hash(self): return hashlib.md5(self.email.lower().encode('utf-8')).hexdigest() def gravatar(self, size=100, default='identicon', rating='g'): url = 'https://secure.gravatar.com/avatar' hash = self.avatar_hash or self.gravatar_hash() return '{url}/{hash}?s={size}&d={default}&r={rating}'.format( url=url, hash=hash, size=size, default=default, rating=rating) def follow(self, user): if not self.is_following(user): f = Follow(follower=self, followed=user) db.session.add(f) def unfollow(self, user): f = self.followed.filter_by(followed_id=user.id).first() if f: db.session.delete(f) def is_following(self, user): if user.id is None: return False return self.followed.filter_by( followed_id=user.id).first() is not None def is_followed_by(self, user): if user.id is None: return False return self.followers.filter_by( follower_id=user.id).first() is not None def __repr__(self): return '' % self.username 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')) @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'] md = markdown(value, output_format='html') clean_md = bleach.clean(md, tags=allowed_tags, strip=True) target.body_html = bleach.linkify(clean_md) db.event.listen(Post.body, 'set', Post.on_changed_body) class AnonymousUser(AnonymousUserMixin): def can(self, perm): 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))