site/backend/app/models.py

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import os
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from datetime import datetime, timezone
from typing import Optional
import sqlalchemy as sa
import sqlalchemy.orm as so
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from werkzeug.security import generate_password_hash, check_password_hash
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import pydenticon, hashlib, base64
from app import db, login
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from flask_login import UserMixin
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class User(UserMixin, db.Model):
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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))
posts: so.WriteOnlyMapped['Post'] = so.relationship(back_populates='author')
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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))
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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)
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def gen_avatar(self, write_png=True):
foreground = [ "rgb(45,79,255)",
"rgb(254,180,44)",
"rgb(226,121,234)",
"rgb(30,179,253)",
"rgb(232,77,65)",
"rgb(49,203,115)",
"rgb(141,69,170)" ]
background = "rgb(22,22,22)"
digest = hashlib.md5(self.email.lower().encode('utf-8')).hexdigest()
basedir = os.path.abspath(os.path.dirname(__file__))
pngloc = os.path.join(basedir, 'usercontent', 'identicon', str(digest) + '.png')
icongen = pydenticon.Generator(5, 5, digest=hashlib.md5, foreground=foreground, background=background)
pngicon = icongen.generate(self.email, 120, 120, padding=(10, 10, 10, 10), inverted=False, output_format="png")
if write_png:
pngfile = open(pngloc, "wb")
pngfile.write(pngicon)
pngfile.close()
else:
return str(base64.b64encode(pngicon))[2:-1]
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def avatar_path(self):
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digest = hashlib.md5(self.email.lower().encode('utf-8')).hexdigest()
basedir = os.path.abspath(os.path.dirname(__file__))
pngloc = os.path.join(basedir, 'usercontent', 'identicon', digest + '.png')
return pngloc
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def __repr__(self):
return '<User {}>'.format(self.username)
class Post(db.Model):
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)
author: so.Mapped[User] = so.relationship(back_populates='posts')
def __repr__(self):
return '<Post {}>'.format(self.body)
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@login.user_loader
def load_user(id):
return db.session.get(User, int(id))