Porter97/app\models(21).py

## app\models(21).py
from datetime import datetime
import hashlib
from werkzeug.security import generate_password_hash, check_password_hash
from itsdangerous import TimedJSONWebSignatureSerializer as Serializer
from flask import current_app
from flask_login import UserMixin, AnonymousUserMixin
from . import db, login_manager
import stream


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 '<Role %r>' % self.name


class CollectionFollow(db.Model):
    __tablename__ = 'collection_follows'
    follower_id = db.Column(db.Integer, db.ForeignKey('users.id'),
                            primary_key=True)
    collection_id = db.Column(db.Integer, db.ForeignKey('collections.id'),
                              primary_key=True)
    timestamp = db.Column(db.DateTime, default=datetime.utcnow)


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(db.Model, UserMixin):
    __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))
    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))
    collections = db.relationship('Collection', backref='author', lazy='dynamic', cascade='all, delete-orphan')
    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')
    followed_collection = db.relationship('CollectionFollow',
                                          foreign_keys=[CollectionFollow.follower_id],
                                          backref=db.backref('c_follower', 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['OFFBRAND_ADMIN']:
                self.role = Role.query.filter_by(name='Administrator').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 = self.gravatar_hash()
        self.follow(self)

    @staticmethod
    def add_self_follows():
        for user in User.query.all():
            if not user.is_following(user):
                user.follow(user)
                db.session.add(user)
                db.session.commit()

    @staticmethod
    def add_self_collection_follows():
        for user in User.query.all():
            for collection in user.collections:
                if not user.is_following_collection(collection):
                    user.follow_collection(collection)
                    db.session.add(user)
                    db.session.commit()

    @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:
            return False
        if data.get('confirm') != self.id:
            return False
        try:
            # Attempt to add user to Stream
            client = stream.connect(current_app.config["STREAM_API_KEY"], current_app.config['STREAM_SECRET'])
            client.users.add(str(self.id), {"username": self.username, "gravatar": self.gravatar(size=40)})
        except:
            # If attempt is unsuccessful, return False
            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:
            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:
            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 = self.gravatar_hash()
        db.session.add(self)
        try:
            # Attempt to add edited user to Stream
            client = stream.connect(current_app.config["STREAM_API_KEY"], current_app.config['STREAM_SECRET'])
            client.users.update(str(self.id), {"username": self.username, "gravatar": self.gravatar(size=40)})
        except:
            # If attempt is unsuccessful, return False
            return False
        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)

    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 stream_user_token(self):
        client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
        return client.create_user_token(str(self.id))

    def follow(self, user):
        client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
        user_feed = client.feed("Notifications", str(self.id))
        if not self.is_following(user):
            user_feed.follow("User", str(user.id))
            f = Follow(follower=self, followed=user)
            db.session.add(f)
            return True

    def unfollow(self, user):
        client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
        user_feed = client.feed("Notifications", str(self.id))
        f = self.followed.filter_by(followed_id=user.id).first()
        if f:
            user_feed.unfollow("User", str(user.id))
            db.session.delete(f)
            return True

    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 is_following_collection(self, collection):
        if collection is None:
            return False
        if collection.id is None:
            return False
        return self.followed_collection.filter_by(
            collection_id=collection.id).first() is not None

    def follow_collection(self, collection):
        client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
        user_feed = client.feed("Timeline", str(self.id))
        if not self.is_following_collection(collection):
            user_feed.follow("Collections", str(collection.id))
            f = CollectionFollow(c_follower=self, following=collection)
            db.session.add(f)
            return True

    def unfollow_collection(self, collection):
        client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
        user_feed = client.feed("Timeline", str(self.id))
        f = self.followed_collection.filter_by(
            collection_id=collection.id).first()
        if f:
            user_feed.unfollow("Collections", str(collection.id))
            db.session.delete(f)
            return True

    def __repr__(self):
        return '<User %r>' % self.username


class AnonymousUser(AnonymousUserMixin):
    def can(self, permissions):
        return False

    def is_administrator(self):
        return False

    def stream_user_token(self):
        return None


login_manager.anonymous_user = AnonymousUser


@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))


class Collection(db.Model):
    __tablename__ = 'collections'
    id = db.Column(db.Integer, primary_key=True)
    stream_id = db.Column(db.String(64))
    name = db.Column(db.String(64))
    description = db.Column(db.String(256))
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    author_id = db.Column(db.Integer, db.ForeignKey('users.id'))
    content = db.relationship('Content', backref='collection', lazy='dynamic', cascade='all, delete-orphan')
    user_followers = db.relationship('CollectionFollow',
                                     foreign_keys=[CollectionFollow.collection_id],
                                     backref=db.backref('following', lazy='joined'),
                                     lazy='dynamic',
                                     cascade='all, delete-orphan')

    def has_content(self, url):
        return self.content.filter_by(url=url).first() is not None

    def add_to_stream(self):
        # Initialize client and add activity to user feed
        try:
            client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
            client.feed("User", str(self.author_id)).add_activity({'actor': client.users.create_reference(str(self.author_id)),
                                                                   'verb': 'create',
                                                                   'object': 'Collection:' + str(self.id),
                                                                   'create': self.name,
                                                                   'foreign_id': 'Collection:' + str(self.id),
                                                                   'description': self.description,
                                                                   'time': self.timestamp
                                                                   })
            return True
        except:
            # If the Stream Client throws an exception or there is a network issue
            return False

    def update_stream(self):
        # Initialize client and update activity
        try:
            client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
            client.update_activity({'actor': client.users.create_reference(str(self.author_id)),
                                    'verb': 'create',
                                    'object': 'Collection:' + str(self.id),
                                    'create': self.name,
                                    'foreign_id': 'Collection:' + str(self.id),
                                    'description': self.description,
                                    'time': self.timestamp
                                    })
            return True
        except:
            return False

    def delete_from_stream(self):
        # Initialize client and delete activity
        try:
            client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
            user_feed = client.feed('User', str(self.author_id))
            user_feed.remove_activity(foreign_id="Collection:" + str(self.id))
            return True
        except:
            return False


class Content(db.Model):
    __tablename__ = 'content'
    id = db.Column(db.Integer, primary_key=True)
    stream_id = db.Column(db.String(64))
    image = db.Column(db.String, default=None)
    title = db.Column(db.String(64))
    url = db.Column(db.String(128))
    description = db.Column(db.String(256))
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    collection_id = db.Column(db.Integer, db.ForeignKey('collections.id'))

    def add_to_stream(self):
        # Initialize client and add activity to user feed
        try:
            client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
            client.feed("Collections", str(self.collection_id)).add_activity({'actor': client.users.create_reference(str(self.collection.author_id)),
                                                                              'verb': 'post',
                                                                              'object': 'Content:' + str(self.id),
                                                                              'post': self.title,
                                                                              'url': self.url,
                                                                              'image': self.image,
                                                                              'description': self.description,
                                                                              'time': self.timestamp,
                                                                              'collection': {
                                                                                  'id': self.collection_id,
                                                                                  'name': self.collection.name
                                                                                   },
                                                                              'foreign_id': 'Content:' + str(self.id)
                                                                             })
            return True
        except:
            # If the Stream Client throws an exception or there is a network issue
            return False

    def add_fields_to_stream(self, **kwargs):
        # Update Stream with new/removed fields
        try:
            client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
            client.activity_partial_update(foreign_id='Content:' + str(self.id),
                                           time=self.timestamp,
                                           set=kwargs
                                           )
            return True
        except:
            return False

    def remove_fields_from_stream(self, **kwargs):
        try:
            client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
            client.activity_partial_update(foreign_id='Content:' + str(self.id),
                                           time=self.timestamp,
                                           unset=kwargs
                                           )
            return True
        except:
            return False

    def update_stream(self):
        # Initialize client and update activity
        try:
            client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
            client.update_activity({'actor': client.users.create_reference(str(self.collection.author_id)),
                                    'verb': 'post',
                                    'object': 'Content:' + str(self.id),
                                    'post': self.title,
                                    'url': self.url,
                                    'description': self.description,
                                    'time': self.timestamp,
                                    'collection': {'id': self.collection_id,
                                                   'name': self.collection.name},
                                    'foreign_id': 'Content:' + str(self.id)
                                    })
            return True
        except:
            return False

    def delete_from_stream(self):
        # Initialize client and delete activity
        try:
            client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
            user_feed = client.feed('Collections', str(self.collection_id))
            user_feed.remove_activity(foreign_id="Content:" + str(self.id))
            return True
        except:
            return False
	from datetime import datetime
	import hashlib
	from werkzeug.security import generate_password_hash, check_password_hash
	from itsdangerous import TimedJSONWebSignatureSerializer as Serializer
	from flask import current_app
	from flask_login import UserMixin, AnonymousUserMixin
	from . import db, login_manager
	import stream


	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 '<Role %r>' % self.name


	class CollectionFollow(db.Model):
	__tablename__ = 'collection_follows'
	follower_id = db.Column(db.Integer, db.ForeignKey('users.id'),
	primary_key=True)
	collection_id = db.Column(db.Integer, db.ForeignKey('collections.id'),
	primary_key=True)
	timestamp = db.Column(db.DateTime, default=datetime.utcnow)


	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(db.Model, UserMixin):
	__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))
	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))
	collections = db.relationship('Collection', backref='author', lazy='dynamic', cascade='all, delete-orphan')
	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')
	followed_collection = db.relationship('CollectionFollow',
	foreign_keys=[CollectionFollow.follower_id],
	backref=db.backref('c_follower', 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['OFFBRAND_ADMIN']:
	self.role = Role.query.filter_by(name='Administrator').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 = self.gravatar_hash()
	self.follow(self)

	@staticmethod
	def add_self_follows():
	for user in User.query.all():
	if not user.is_following(user):
	user.follow(user)
	db.session.add(user)
	db.session.commit()

	@staticmethod
	def add_self_collection_follows():
	for user in User.query.all():
	for collection in user.collections:
	if not user.is_following_collection(collection):
	user.follow_collection(collection)
	db.session.add(user)
	db.session.commit()

	@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:
	return False
	if data.get('confirm') != self.id:
	return False
	try:
	# Attempt to add user to Stream
	client = stream.connect(current_app.config["STREAM_API_KEY"], current_app.config['STREAM_SECRET'])
	client.users.add(str(self.id), {"username": self.username, "gravatar": self.gravatar(size=40)})
	except:
	# If attempt is unsuccessful, return False
	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:
	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:
	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 = self.gravatar_hash()
	db.session.add(self)
	try:
	# Attempt to add edited user to Stream
	client = stream.connect(current_app.config["STREAM_API_KEY"], current_app.config['STREAM_SECRET'])
	client.users.update(str(self.id), {"username": self.username, "gravatar": self.gravatar(size=40)})
	except:
	# If attempt is unsuccessful, return False
	return False
	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)

	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 stream_user_token(self):
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	return client.create_user_token(str(self.id))

	def follow(self, user):
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	user_feed = client.feed("Notifications", str(self.id))
	if not self.is_following(user):
	user_feed.follow("User", str(user.id))
	f = Follow(follower=self, followed=user)
	db.session.add(f)
	return True

	def unfollow(self, user):
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	user_feed = client.feed("Notifications", str(self.id))
	f = self.followed.filter_by(followed_id=user.id).first()
	if f:
	user_feed.unfollow("User", str(user.id))
	db.session.delete(f)
	return True

	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 is_following_collection(self, collection):
	if collection is None:
	return False
	if collection.id is None:
	return False
	return self.followed_collection.filter_by(
	collection_id=collection.id).first() is not None

	def follow_collection(self, collection):
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	user_feed = client.feed("Timeline", str(self.id))
	if not self.is_following_collection(collection):
	user_feed.follow("Collections", str(collection.id))
	f = CollectionFollow(c_follower=self, following=collection)
	db.session.add(f)
	return True

	def unfollow_collection(self, collection):
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	user_feed = client.feed("Timeline", str(self.id))
	f = self.followed_collection.filter_by(
	collection_id=collection.id).first()
	if f:
	user_feed.unfollow("Collections", str(collection.id))
	db.session.delete(f)
	return True

	def __repr__(self):
	return '<User %r>' % self.username


	class AnonymousUser(AnonymousUserMixin):
	def can(self, permissions):
	return False

	def is_administrator(self):
	return False

	def stream_user_token(self):
	return None


	login_manager.anonymous_user = AnonymousUser


	@login_manager.user_loader
	def load_user(user_id):
	return User.query.get(int(user_id))


	class Collection(db.Model):
	__tablename__ = 'collections'
	id = db.Column(db.Integer, primary_key=True)
	stream_id = db.Column(db.String(64))
	name = db.Column(db.String(64))
	description = db.Column(db.String(256))
	timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
	author_id = db.Column(db.Integer, db.ForeignKey('users.id'))
	content = db.relationship('Content', backref='collection', lazy='dynamic', cascade='all, delete-orphan')
	user_followers = db.relationship('CollectionFollow',
	foreign_keys=[CollectionFollow.collection_id],
	backref=db.backref('following', lazy='joined'),
	lazy='dynamic',
	cascade='all, delete-orphan')

	def has_content(self, url):
	return self.content.filter_by(url=url).first() is not None

	def add_to_stream(self):
	# Initialize client and add activity to user feed
	try:
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	client.feed("User", str(self.author_id)).add_activity({'actor': client.users.create_reference(str(self.author_id)),
	'verb': 'create',
	'object': 'Collection:' + str(self.id),
	'create': self.name,
	'foreign_id': 'Collection:' + str(self.id),
	'description': self.description,
	'time': self.timestamp
	})
	return True
	except:
	# If the Stream Client throws an exception or there is a network issue
	return False

	def update_stream(self):
	# Initialize client and update activity
	try:
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	client.update_activity({'actor': client.users.create_reference(str(self.author_id)),
	'verb': 'create',
	'object': 'Collection:' + str(self.id),
	'create': self.name,
	'foreign_id': 'Collection:' + str(self.id),
	'description': self.description,
	'time': self.timestamp
	})
	return True
	except:
	return False

	def delete_from_stream(self):
	# Initialize client and delete activity
	try:
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	user_feed = client.feed('User', str(self.author_id))
	user_feed.remove_activity(foreign_id="Collection:" + str(self.id))
	return True
	except:
	return False


	class Content(db.Model):
	__tablename__ = 'content'
	id = db.Column(db.Integer, primary_key=True)
	stream_id = db.Column(db.String(64))
	image = db.Column(db.String, default=None)
	title = db.Column(db.String(64))
	url = db.Column(db.String(128))
	description = db.Column(db.String(256))
	timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
	collection_id = db.Column(db.Integer, db.ForeignKey('collections.id'))

	def add_to_stream(self):
	# Initialize client and add activity to user feed
	try:
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	client.feed("Collections", str(self.collection_id)).add_activity({'actor': client.users.create_reference(str(self.collection.author_id)),
	'verb': 'post',
	'object': 'Content:' + str(self.id),
	'post': self.title,
	'url': self.url,
	'image': self.image,
	'description': self.description,
	'time': self.timestamp,
	'collection': {
	'id': self.collection_id,
	'name': self.collection.name
	},
	'foreign_id': 'Content:' + str(self.id)
	})
	return True
	except:
	# If the Stream Client throws an exception or there is a network issue
	return False

	def add_fields_to_stream(self, **kwargs):
	# Update Stream with new/removed fields
	try:
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	client.activity_partial_update(foreign_id='Content:' + str(self.id),
	time=self.timestamp,
	set=kwargs
	)
	return True
	except:
	return False

	def remove_fields_from_stream(self, **kwargs):
	try:
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	client.activity_partial_update(foreign_id='Content:' + str(self.id),
	time=self.timestamp,
	unset=kwargs
	)
	return True
	except:
	return False

	def update_stream(self):
	# Initialize client and update activity
	try:
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	client.update_activity({'actor': client.users.create_reference(str(self.collection.author_id)),
	'verb': 'post',
	'object': 'Content:' + str(self.id),
	'post': self.title,
	'url': self.url,
	'description': self.description,
	'time': self.timestamp,
	'collection': {'id': self.collection_id,
	'name': self.collection.name},
	'foreign_id': 'Content:' + str(self.id)
	})
	return True
	except:
	return False

	def delete_from_stream(self):
	# Initialize client and delete activity
	try:
	client = stream.connect(current_app.config['STREAM_API_KEY'], current_app.config['STREAM_SECRET'])
	user_feed = client.feed('Collections', str(self.collection_id))
	user_feed.remove_activity(foreign_id="Content:" + str(self.id))
	return True
	except:
	return False