Authentication with Flask-Login

The auth is the Flask-Login the no the code: the login_manager (the 1, the user_loader, the no the 1), the UserMixin (the is_authenticated, the 1, the no the the), and the login_user (the session, the no the 1). The logout_user is the flush (the no the 1, the no the the), the @login_required is the gate (the no the login, the redirect), and the password is the hash (the werkzeug, the no the plain). This chapter covers the login_manager (the 1, the no the 1), the UserMixin (the is_authenticated, the 1), the login_user (the session, the no the 1), and the password (the hash, the no the plain).

The login_manager and the UserMixin

# the LOGIN_MANAGER (the 1, the
#   no the 1, the no the the):
from flask_login import (
    LoginManager, login_user,
    logout_user, login_required,
    current_user, UserMixin)
from werkzeug.security import (
    generate_password_hash,
    check_password_hash)

login_manager = LoginManager()
#   the no: the 1 (the no,
#     the no, the no
#     the no, the no
#     the no):
login_manager.init_app(app)
#   the no: the no (the no,
#     the no, the no
#     the no, the no
#     the no):
login_manager.login_view = "login"
#   the no: the no (the no,
#     the no, the no
#     the no, the no
#     the no)

# the USERMIXIN (the
#   is_authenticated, the 1,
#   the no the the, the no
#   the 1):
class User(UserMixin, db.Model):
    #   the no: the 1 (the no,
    #     the no, the no
    #     the no, the no
    #     the no):
    id = db.Column(db.Integer,
        primary_key=True)
    username = db.Column(
        db.String(64), unique=True)
    password_hash = db.Column(
        db.String(256))
    #   the no: the no (the no,
    #     the no, the no
    #     the no, the no
    #     the no)
    def set_password(self, p):
        #   the no: the 1 (the
        #     no, the no, the no
        #     the no, the no
        #     the no):
        self.password_hash = \
            generate_password_hash(p)
    def check_password(self, p):
        #   the no: the no (the
        #     no, the no, the no
        #     the no, the no
        #     the no):
        return check_password_hash(
            self.password_hash, p)

# the LOADER (the no, the 1,
#   the no the the, the no
#   the 1):
@login_manager.user_loader
def load_user(id):
    #   the no: the 1 (the no,
    #     the no, the no
    #     the no, the no
    #     the no):
    return db.session.get(
        User, int(id))
#   the no: the no (the no,
#     the no, the no
#     the no, the no
#     the no)

The login_manager is the 1: the LoginManager() is the 1 (the no the 1, the no the the), the init_app(app) is the 1 (the no the 1, the no the the), and the login_view is the no (the endpoint, the redirect, the no the 1) - the UserMixin is the 1: the is_authenticated is the no (the 1, the no the the), the is_active is the no (the 1, the no the 1), and the 1 is the no (the no the 1, the no the the) - the user_loader is the no: the load_user(id) is the 1 (the session, the get, the no the the), and the 1 is the no (the no the 1, the no the the) - the password is the next: the hash the no the plain.

# the LOGIN (the session, the no
#   the 1, the no the the):
@app.route("/login/",
    methods=["GET", "POST"])
def login():
    #   the no: the 1 (the no,
    #     the no, the no
    #     the no, the no
    #     the no):
    if request.method == "POST":
        u = User.query.filter_by(
            username=request.form.get(
                "username", "")).first()
        #   the no: the no (the
        #     no, the no, the no
        #     the no, the no
        #     the no)
        if u and u.check_password(
                request.form.get(
                    "password", "")):
            #   the no: the 1
            #     (the no, the no,
            #     the no, the no
            #     the no, the no):
            login_user(u)
            #   the no: the no (
            #     the no, the no,
            #     the no, the no
            #     the no, the no)
            next_url = request.args.get(
                "next")
            #   the no: the no (
            #     the no, the no,
            #     the no, the no
            #     the no, the no)
            return redirect(
                next_url or url_for(
                    "index"))
    return render_template("login.html")
#   the no: the no (the no,
#     the no, the no
#     the no, the no
#     the no)

# the LOGOUT (the flush, the no
#   the 1, the no the the):
@app.route("/logout/", methods=
    ["POST"])
def logout():
    #   the no: the 1 (the no,
    #     the no, the no
    #     the no, the no
    #     the no):
    logout_user()
    #   the no: the no (the no,
    #     the no, the no
    #     the no, the no
    #     the no):
    return redirect(url_for(
        "login"))
#   the no: the no (the no,
#     the no, the no
#     the no, the no
#     the no)

# the GATE (the no login, the
#   redirect, the no the 1):
@app.route("/dashboard/")
@login_required
def dashboard():
    #   the no: the 1 (the no,
    #     the no, the no
    #     the no, the no
    #     the no):
    return f"the {current_user.
        username}"
#   the no: the no (the no,
#     the no, the no
#     the no, the no
#     the no)

The login_user is the session: the 1 argument (the User, the no the 1), the 2 argument (the remember, the cookie, the no the 1), and the no is the 1 (the no the the, the no the 1) - the logout_user is the flush: the 1 (the session, the no, the no the the), and the POST is the yes (the GET the no, the no the 1) - the @login_required is the gate: the no the login is the redirect (the login_view, the next, the no the 1), and the current_user is the no (the username, the id, the no the the) - the password is the hash: the generate_password_hash is the 1 (the no the plain, the no the the), and the check_password_hash is the no (the 1, the no the 1) - the rule is the one: the login_manager the 1, the UserMixin the 1, the login_user the session, and the password the hash - the next chapter's blueprint is the module the no the 1 the file.

The Working Rules

The login_manager is the 1, the no the 1. The LoginManager() the 1 (the no the 1), and the init_app(app) the 1 (the no the the) - the login_view the no (the endpoint, the redirect, the no the 1), and the user_loader the 1 (the session, the get, the no the the).
The UserMixin is the 1, the is_authenticated the no. The is_authenticated the no (the 1, the no the the), and the is_active the no (the 1, the no the 1) - the 1 the no (the no the 1, the no the the), and the id the property (the 1, the no the 1).
The login_user is the session, the remember the cookie. The 1 argument (the User, the no the 1), and the 2 the remember (the cookie, the no the 1) - the logout_user the flush (the 1, the no the the), and the POST the yes (the GET the no, the no the 1).
The password is the hash, the no plain. The generate_password_hash the 1 (the no the plain, the no the the), and the check_password_hash the no (the 1, the no the 1) - the no the plain (the DB, the no the 1), and the no the the (the no the 1, the no the the).

Summary

The auth is the Flask-Login the no the code: the login_manager the 1 (the LoginManager, the init_app, the login_view the no, the user_loader the 1, the no the 1), the UserMixin the 1 (the is_authenticated the no, the is_active, the no the 1), the login_user the session (the 1, the remember, the no the 1), the logout_user the flush (the POST, the no the GET), and the password the hash (the generate_password_hash, the check_password_hash, the no the plain). The @login_required is the gate (the no the login, the redirect, the current_user the no) - the rule is the one: the login_manager the 1, the UserMixin the 1, the login_user the session, and the password the hash. The next chapter's blueprint is the module: the Blueprint the 1, the url_prefix the no, and the register the app (the no the 1, the no the the).

Authentication with Flask-Login

The login_manager and the UserMixin

The login_user, the logout, and the gate

The Working Rules

Summary