Add login, register, logout methods

app/forms.py

@@ -1,6 +1,7 @@
 from flask_wtf import FlaskForm
 from wtforms import StringField, PasswordField, BooleanField, SubmitField
 from wtforms.validators import ValidationError, DataRequired, Email, EqualTo
+from app.models import User
 
 
 class LoginForm(FlaskForm):
@@ -8,3 +9,22 @@ class LoginForm(FlaskForm):
     password = PasswordField('Password', validators=[DataRequired()])
     remember_me = BooleanField('Remember Me')
     submit = SubmitField('Sign In')
+
+
+class RegistrationForm(FlaskForm):
+    username = StringField('Username', validators=[DataRequired()])
+    email = StringField('Email', validators=[DataRequired(), Email()])
+    password = PasswordField('Password', validators=[DataRequired()])
+    password2 = PasswordField(
+        'Repeat Password', validators=[DataRequired(), EqualTo('password')])
+    submit = SubmitField('Register')
+
+    def validate_username(self, username):
+        user = User.query.filter_by(username=username.data).first()
+        if user is not None:
+            raise ValidationError('Please use a different username.')
+
+    def validate_email(self, email):
+        user = User.query.filter_by(email=email.data).first()
+        if user is not None:
+            raise ValidationError('Please use a different email address.')

app/routes.py

@@ -1,4 +1,11 @@
 from app import app
+from app import db
+from app.forms import LoginForm, RegistrationForm
+from app.models import User
+from flask import render_template, flash, redirect, url_for
+from flask_login import current_user, login_user, logout_user
+from flask_login import login_required
+
 
 @app.route('/')
 @app.route('/index')
@@ -6,11 +13,43 @@ def index():
     return "Hello, World!"
 
 
-@app.route('/login')
-def index():
-    return "Hello, World!"
+@app.route('/register', methods=['GET', 'POST'])
+def register():
+    if current_user.is_authenticated:
+        return redirect(url_for('index'))
+    form = RegistrationForm()
+    if form.validate_on_submit():
+        user = User(username=form.username.data, email=form.email.data)
+        user.set_password(form.password.data)
+        db.session.add(user)
+        db.session.commit()
+        flash('Congratulations, you are now a registered user!')
+        return redirect(url_for('login'))
+    return render_template('register.html', title='Register', form=form)
+
+
+@app.route('/login', methods=['GET', 'POST'])
+def login():
+    if current_user.is_authenticated:
+        return redirect(url_for('index'))
+    form = LoginForm()
+    if form.validate_on_submit():
+        user = User.query.filter_by(username=form.username.data).first()
+        if user is None or not user.check_password(form.password.data):
+            flash('Invalid username or password')
+            return redirect(url_for('login'))
+        login_user(user, remember=form.remember_me.data)
+        return redirect(url_for('admin'))
+    return render_template('login.html', title='Sign In', form=form)
 
 
 @app.route('/admin')
-def index():
+@login_required
+def admin():
     return "Hello, World!"
+
+
+@app.route('/logout')
+def logout():
+    logout_user()
+    return redirect(url_for('index'))

app/templates/login.html

@@ -1,6 +1,7 @@
 {% extends "base.html" %}
 
 {% block content %}
+    <h1>Hi, {{ current_user.username }}!</h1>
     <h1>Sign In</h1>
     <form action="" method="post" novalidate>
         {{ form.hidden_tag() }}

app/templates/register.html

@@ -0,0 +1,38 @@
+{% extends "base.html" %}
+
+{% block content %}
+    <h1>Hi, {{ current_user.username }}!</h1>
+    <h1>Register</h1>
+    <form action="" method="post">
+        {{ form.hidden_tag() }}
+        <p>
+            {{ form.username.label }}<br>
+            {{ form.username(size=32) }}<br>
+            {% for error in form.username.errors %}
+            <span style="color: red;">[{{ error }}]</span>
+            {% endfor %}
+        </p>
+        <p>
+            {{ form.email.label }}<br>
+            {{ form.email(size=64) }}<br>
+            {% for error in form.email.errors %}
+            <span style="color: red;">[{{ error }}]</span>
+            {% endfor %}
+        </p>
+        <p>
+            {{ form.password.label }}<br>
+            {{ form.password(size=32) }}<br>
+            {% for error in form.password.errors %}
+            <span style="color: red;">[{{ error }}]</span>
+            {% endfor %}
+        </p>
+        <p>
+            {{ form.password2.label }}<br>
+            {{ form.password2(size=32) }}<br>
+            {% for error in form.password2.errors %}
+            <span style="color: red;">[{{ error }}]</span>
+            {% endfor %}
+        </p>
+        <p>{{ form.submit() }}</p>
+    </form>
+{% endblock %}