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from datetime import datetime, timezone
from hashlib import md5
from time import time
from typing import Optional
import sqlalchemy as sa
import sqlalchemy.orm as so
from flask import current_app
from flask_login import UserMixin
from werkzeug.security import generate_password_hash, check_password_hash
import jwt
from app import db, login
from app.search import add_to_index, remove_from_index, query_index
class SearchableMixin:
@classmethod
def search(cls, expression, page, per_page):
ids, total = query_index(cls.__tablename__, expression, page, per_page)
if total == 0:
return [], 0
when = []
for i in range(len(ids)):
when.append((ids[i], i))
query = sa.select(cls).where(cls.id.in_(ids)).order_by(
db.case(*when, value=cls.id))
return db.session.scalars(query), total
@classmethod
def before_commit(cls, session):
session._changes = {
'add': list(session.new),
'update': list(session.dirty),
'delete': list(session.deleted)
}
@classmethod
def after_commit(cls, session):
for obj in session._changes['add']:
if isinstance(obj, SearchableMixin):
add_to_index(obj.__tablename__, obj)
for obj in session._changes['update']:
if isinstance(obj, SearchableMixin):
add_to_index(obj.__tablename__, obj)
for obj in session._changes['delete']:
if isinstance(obj, SearchableMixin):
remove_from_index(obj.__tablename__, obj)
session._changes = None
@classmethod
def reindex(cls):
for obj in db.session.scalars(sa.select(cls)):
add_to_index(cls.__tablename__, obj)
db.event.listen(db.session, 'before_commit', SearchableMixin.before_commit)
db.event.listen(db.session, 'after_commit', SearchableMixin.after_commit)
followers = sa.Table(
'followers',
db.metadata,
sa.Column('follower_id', sa.Integer, sa.ForeignKey('user.id'),
primary_key=True),
sa.Column('followed_id', sa.Integer, sa.ForeignKey('user.id'),
primary_key=True)
)
class User(UserMixin, db.Model):
id: so.Mapped[int] = so.mapped_column(primary_key=True)
username: so.Mapped[str] = so.mapped_column(sa.String(64), index=True,
unique=True)
email: so.Mapped[str] = so.mapped_column(sa.String(120), index=True,
unique=True)
password_hash: so.Mapped[Optional[str]] = so.mapped_column(sa.String(256))
about_me: so.Mapped[Optional[str]] = so.mapped_column(sa.String(140))
last_seen: so.Mapped[Optional[datetime]] = so.mapped_column(
default=lambda: datetime.now(timezone.utc))
posts: so.WriteOnlyMapped['Post'] = so.relationship(
back_populates='author')
following: so.WriteOnlyMapped['User'] = so.relationship(
secondary=followers, primaryjoin=(followers.c.follower_id == id),
secondaryjoin=(followers.c.followed_id == id),
back_populates='followers')
followers: so.WriteOnlyMapped['User'] = so.relationship(
secondary=followers, primaryjoin=(followers.c.followed_id == id),
secondaryjoin=(followers.c.follower_id == id),
back_populates='following')
def __repr__(self):
return '<User {}>'.format(self.username)
def set_password(self, password):
self.password_hash = generate_password_hash(password)
def check_password(self, password):
return check_password_hash(self.password_hash, password)
def avatar(self, size):
digest = md5(self.email.lower().encode('utf-8')).hexdigest()
return f'https://www.gravatar.com/avatar/{digest}?d=identicon&s={size}'
def follow(self, user):
if not self.is_following(user):
self.following.add(user)
def unfollow(self, user):
if self.is_following(user):
self.following.remove(user)
def is_following(self, user):
query = self.following.select().where(User.id == user.id)
return db.session.scalar(query) is not None
def followers_count(self):
query = sa.select(sa.func.count()).select_from(
self.followers.select().subquery())
return db.session.scalar(query)
def following_count(self):
query = sa.select(sa.func.count()).select_from(
self.following.select().subquery())
return db.session.scalar(query)
def following_posts(self):
Author = so.aliased(User)
Follower = so.aliased(User)
return (
sa.select(Post)
.join(Post.author.of_type(Author))
.join(Author.followers.of_type(Follower), isouter=True)
.where(sa.or_(
Follower.id == self.id,
Author.id == self.id,
))
.group_by(Post)
.order_by(Post.timestamp.desc())
)
def get_reset_password_token(self, expires_in=600):
return jwt.encode(
{'reset_password': self.id, 'exp': time() + expires_in},
current_app.config['SECRET_KEY'], algorithm='HS256')
@staticmethod
def verify_reset_password_token(token):
try:
id = jwt.decode(token, current_app.config['SECRET_KEY'],
algorithms=['HS256'])['reset_password']
except Exception:
return
return db.session.get(User, id)
@login.user_loader
def load_user(id):
return db.session.get(User, int(id))
class Post(SearchableMixin, db.Model):
__searchable__ = ['body']
id: so.Mapped[int] = so.mapped_column(primary_key=True)
body: so.Mapped[str] = so.mapped_column(sa.String(140))
timestamp: so.Mapped[datetime] = so.mapped_column(
index=True, default=lambda: datetime.now(timezone.utc))
user_id: so.Mapped[int] = so.mapped_column(sa.ForeignKey(User.id),
index=True)
language: so.Mapped[Optional[str]] = so.mapped_column(sa.String(5))
author: so.Mapped[User] = so.relationship(back_populates='posts')
def __repr__(self):
return '<Post {}>'.format(self.body)
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