132 lines
3.9 KiB
Python
132 lines
3.9 KiB
Python
# The Mia! Accounting Demonstration Website.
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# Author: imacat@mail.imacat.idv.tw (imacat), 2023/1/27
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# Copyright (c) 2023 imacat.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""The authentication for the Mia! Accounting demonstration website.
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"""
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import typing as t
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from flask import Blueprint, render_template, Flask, redirect, url_for, \
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session, request, g, Response, abort
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from sqlalchemy.orm import Mapped, mapped_column
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from . import db
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bp: Blueprint = Blueprint("auth", __name__, url_prefix="/")
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"""The authentication blueprint."""
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class User(db.Model):
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"""A user."""
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__tablename__ = "users"
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"""The table name."""
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id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
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"""The ID."""
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username: Mapped[str] = mapped_column(unique=True)
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"""The username."""
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def __str__(self) -> str:
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"""Returns the string representation of the user.
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:return: The string representation of the user.
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"""
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return self.username
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@bp.get("login", endpoint="login-form")
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def show_login_form() -> str | Response:
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"""Shows the login form.
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:return: The login form.
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"""
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if "user" in session:
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return redirect(url_for("accounting-report.default"))
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return render_template("login.html")
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@bp.post("login", endpoint="login")
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def login() -> redirect:
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"""Logs in the user.
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:return: The redirection to the home page.
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"""
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from accounting.utils.next_uri import inherit_next, or_next
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if request.form.get("username") not in {"viewer", "editor", "admin",
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"nobody"}:
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return redirect(inherit_next(url_for("auth.login")))
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session["user"] = request.form.get("username")
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return redirect(or_next(url_for("accounting-report.default")))
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@bp.post("logout", endpoint="logout")
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def logout() -> redirect:
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"""Logs out the user.
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:return: The redirection to the home page.
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"""
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if "user" in session:
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del session["user"]
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return redirect(url_for("home.home"))
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def current_user() -> User | None:
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"""Returns the current user.
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:return: The current user, or None if the user did not log in.
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"""
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if not hasattr(g, "user"):
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if "user" not in session:
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g.user = None
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else:
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g.user = User.query.filter(
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User.username == session["user"]).first()
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return g.user
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def admin_required(view: t.Callable) -> t.Callable:
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"""The view decorator to require the user to be an administrator.
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:param view: The view.
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:return: The decorated view.
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"""
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def decorated_view(*args, **kwargs):
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"""The decorated view that tests against a permission rule.
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:param args: The arguments of the view.
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:param kwargs: The keyword arguments of the view.
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:return: The response of the view.
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:raise Forbidden: When the user is denied.
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"""
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from accounting.utils.next_uri import append_next
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if "user" not in session:
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return redirect(append_next(url_for("auth.login")))
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if session["user"] != "admin":
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abort(403)
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return view(*args, **kwargs)
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return decorated_view
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def init_app(app: Flask) -> None:
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"""Initialize the localization.
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:param app: The Flask application.
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:return: None.
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"""
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app.register_blueprint(bp)
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app.jinja_env.globals["current_user"] = current_user
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