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blog.py
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blog.py
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from flask import Flask, render_template, request, redirect, url_for, flash
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, SubmitField, ValidationError, TextAreaField
from wtforms.validators import DataRequired, Email, EqualTo, Length
from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import login_user, current_user, login_required, logout_user, LoginManager, UserMixin
from datetime import datetime
app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///database.db"
app.config["SECRET_KEY"] = "so secret that i dont even know what my secret key is"
db = SQLAlchemy(app)
migrate = Migrate(app, db)
login_manager = LoginManager(app)
login_manager.init_app(app)
login_manager.login_view = "login"
# help login manager get info about user
@login_manager.user_loader
def load_user(user_id):
return Users.query.get(user_id)
class Users(UserMixin, db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(80), nullable=False, unique=True)
email = db.Column(db.String(255), nullable=False, unique=True)
password = db.Column(db.String(120), nullable=False)
# hash password
def set_password(self, password):
self.password = generate_password_hash(password)
# check if passwords are the same
def check_password(self, password):
return check_password_hash(self.password, password)
db.create_all()
class Blogs(db.Model):
id = db.Column(db.Integer, primary_key=True)
title = db.Column(db.String(150), nullable=False)
body = db.Column(db.String(), nullable=False)
author_name = db.Column(db.String(80), nullable=False)
created_on = db.Column(db.DateTime)
updated_on = db.Column(db.DateTime)
db.create_all()
class RegistrationForm(FlaskForm):
username = StringField("Username", validators=[
DataRequired(), Length(min=3, max=79)])
email = StringField("Email", validators=[DataRequired()])
password = PasswordField("Password", validators=[
DataRequired(), EqualTo("pass_confirm")])
pass_confirm = PasswordField(
"Confirm Password", validators=[DataRequired()])
submit = SubmitField("Register")
# Using function to validate username
def validate_username(self, field):
if Users.query.filter_by(username=field.data).first():
flash("Existed username")
raise ValidationError("Existed Username")
# Using function to validate email
def validate_email(self, field):
if Users.query.filter_by(email=field.data).first():
flash("Existed email")
raise ValidationError("Existed Email")
class LoginForm(FlaskForm):
username = StringField("Username", validators=[DataRequired()])
password = PasswordField("Password", validators=[DataRequired()])
submit = SubmitField("Login")
class BlogForm(FlaskForm):
title = StringField("Title", validators=[
DataRequired(), Length(min=3, max=150)])
body = TextAreaField("Body", validators=[DataRequired()])
submit = SubmitField("Create")
@app.route("/")
def index():
return render_template("index.html")
@app.route("/register", methods=["POST", "GET"])
def register():
form = RegistrationForm()
if form.validate_on_submit():
# create user
new_user = Users(username=form.username.data,
email=form.email.data)
new_user.set_password(form.password.data)
db.session.add(new_user)
db.session.commit()
# looking for login() function and redirect to its route
return redirect(url_for("login"))
return render_template("register.html", form=form)
@app.route("/login", methods=["POST", "GET"])
def login():
form = LoginForm()
if form.validate_on_submit():
log_user = Users.query.filter_by(username=form.username.data).first()
# check if username exists
if log_user is None:
flash("Invalid Username")
return redirect(url_for("login"))
# if username is correct
if not log_user.check_password(form.password.data):
# Handle passsword is not correct
flash("Incorrect password")
return redirect(url_for("login"))
# we have the correct username and password
login_user(log_user)
return redirect(url_for("welcome"))
return render_template("login.html", form=form)
@app.route("/logout")
def logout():
logout_user()
return redirect(url_for("index"))
@app.route("/welcome")
@login_required
def welcome():
return render_template("welcome.html")
@app.route("/create", methods=["POST", "GET"])
@login_required
def create():
form = BlogForm()
if form.validate_on_submit():
author_name = current_user.username
create = datetime.now()
new_post = Blogs(title=form.title.data,
body=form.body.data,
author_name=author_name,
created_on=create)
db.session.add(new_post)
db.session.commit()
return redirect(url_for("posts"))
return render_template("create.html", form=form)
@app.route("/posts")
def posts():
posts = Blogs.query.all()
return render_template("posts.html", posts=posts)
@app.route("/update/<post_id>", methods=["POST", "GET"])
@login_required
def update(post_id):
post = Blogs.query.filter_by(id=post_id).first()
form = BlogForm()
form.title.data = post.title
form.body.data = post.body
if current_user.username != post.author_name:
flash("You are not the owner of this post")
return redirect(url_for("posts"))
if form.validate_on_submit():
post.title = form.title.data
post.body = form.body.data
post.updated_on = datetime.now()
db.session.commit()
return redirect(url_for("posts"))
return render_template("update.html", form=form)
@app.route("/delete/<post_id>", methods=["POST", "GET"])
@login_required
def delete(post_id):
post = Blogs.query.filter_by(id=post_id).first()
form = BlogForm()
if current_user.username != post.author_name:
flash("You are not the owner of this post")
return redirect(url_for("posts"))
db.session.delete(post)
db.session.commit()
return redirect(url_for("posts"))
if __name__ == "__main__":
app.run(debug=True)