server.py

import os
from flask import Flask, render_template, redirect, url_for, flash, abort
from flask_bootstrap import Bootstrap
from flask_ckeditor import CKEditor
from datetime import date
from werkzeug.security import generate_password_hash, check_password_hash
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy.orm import relationship
from flask_login import UserMixin, login_user, LoginManager, login_required, current_user, logout_user
from forms import CreatePostForm, RegisterForm, LoginForm, CommentForm
from flask_gravatar import Gravatar
from functools import wraps


app = Flask(__name__)
app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY')
ckeditor = CKEditor(app)
Bootstrap(app)

app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///blog.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)


class User(UserMixin, db.Model):
    __tablename__ = "users"
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(100), unique=True)
    password = db.Column(db.String(100))
    name = db.Column(db.String(100))
    posts = relationship("BlogPost", back_populates="author")
    comments = relationship("Comment", back_populates="comment_author")


class BlogPost(db.Model):
    __tablename__ = "blog_posts"
    id = db.Column(db.Integer, primary_key=True)
    author_id = db.Column(db.Integer, db.ForeignKey("users.id"))
    author = relationship("User", back_populates="posts")
    title = db.Column(db.String(250), unique=True, nullable=False)
    subtitle = db.Column(db.String(250), nullable=False)
    date = db.Column(db.String(250), nullable=False)
    body = db.Column(db.Text, nullable=False)
    img_url = db.Column(db.String(250), nullable=False)
    comments = relationship("Comment", back_populates="parent_post")


class Comment(db.Model):
    __tablename__ = "comments"
    id = db.Column(db.Integer, primary_key=True)
    post_id = db.Column(db.Integer, db.ForeignKey("blog_posts.id"))
    author_id = db.Column(db.Integer, db.ForeignKey("users.id"))
    parent_post = relationship("BlogPost", back_populates="comments")
    comment_author = relationship("User", back_populates="comments")
    text = db.Column(db.Text, nullable=False)


db.create_all()


@app.route('/')
def get_all_posts():
    if current_user.is_authenticated:
        posts = BlogPost.query.all()
        return render_template("index.html", all_posts=posts)
    else:
        return redirect(url_for('login'))


@app.route('/register', methods=["GET", "POST"])
def register():
    form = RegisterForm()
    if form.validate_on_submit():
        email = form.email.data
        if db.session.query(User).filter_by(email=email).first():
            flash("You've already signed up with email ID. Please login!")
            return redirect(url_for('login'))
        else:
            hash_and_salted_password = generate_password_hash(
                form.password.data,
                method='pbkdf2:sha256',
                salt_length=8
            )
            new_user = User(email=email, name=form.name.data, password=hash_and_salted_password)
            db.session.add(new_user)
            db.session.commit()
            login_user(new_user)
            return redirect(url_for("get_all_posts"))

    return render_template("register.html", form=form)


login_manager = LoginManager()
login_manager.init_app(app)


@login_manager.user_loader
def load_user(user_id):
    return db.session.query(User).filter_by(id=int(user_id)).first()


@app.route('/login', methods=["GET", "POST"])
def login():
    form = LoginForm()
    if form.validate_on_submit():
        email = form.email.data
        if db.session.query(User).filter_by(email=email).first():
            password = form.password.data
            user = db.session.query(User).filter_by(email=email).first()
            if check_password_hash(user.password, password):
                login_user(user)
                return redirect(url_for('get_all_posts'))
            else:
                flash("The password is incorrect!")
        else:
            flash("This email ID doesn't exist. Please try again!")
    return render_template("login.html", form=form)


@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('login'))


@app.route("/post/<int:post_id>", methods=["GET", "POST"])
@login_required
def show_post(post_id):
    form = CommentForm()
    requested_post = BlogPost.query.get(post_id)

    if form.validate_on_submit():
        if not current_user.is_authenticated:
            flash("You need to login or register to comment.")
            return redirect(url_for("login"))

        new_comment = Comment(
            text=form.comment_text.data,
            comment_author=current_user,
            parent_post=requested_post
        )
        db.session.add(new_comment)
        db.session.commit()

    return render_template("post.html", post=requested_post, form=form, current_user=current_user)


@app.route("/about")
def about():
    return render_template("about.html")


@app.route("/contact")
def contact():
    return render_template("contact.html")


def admin_only(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        # If id is not 1 then return abort with 403 error
        if current_user.id != 1:
            return abort(403)
        # Otherwise continue with the route function
        return f(*args, **kwargs)
    return decorated_function


@app.route("/new-post", methods=["GET", "POST"])
@login_required
@admin_only
def add_new_post():
    form = CreatePostForm()
    if form.validate_on_submit():
        new_post = BlogPost(
            title=form.title.data,
            subtitle=form.subtitle.data,
            body=form.body.data,
            img_url=form.img_url.data,
            author=current_user,
            date=date.today().strftime("%B %d, %Y")
        )
        db.session.add(new_post)
        db.session.commit()
        return redirect(url_for("get_all_posts"))

    return render_template("make-post.html", form=form, current_user=current_user)


@app.route("/edit-post/<int:post_id>")
@login_required
@admin_only
def edit_post(post_id):
    if current_user.id == 1:
        post = BlogPost.query.get(post_id)
        edit_form = CreatePostForm(
            title=post.title,
            subtitle=post.subtitle,
            img_url=post.img_url,
            author=post.author,
            body=post.body
        )
        if edit_form.validate_on_submit():
            post.title = edit_form.title.data
            post.subtitle = edit_form.subtitle.data
            post.img_url = edit_form.img_url.data
            post.author = edit_form.author.data
            post.body = edit_form.body.data
            db.session.commit()
            return redirect(url_for("show_post", post_id=post.id))

    return render_template("make-post.html", form=edit_form, current_user=current_user)


@app.route("/delete/<int:post_id>")
@login_required
@admin_only
def delete_post(post_id):
    if current_user.id == 1:
        post_to_delete = BlogPost.query.get(post_id)
        db.session.delete(post_to_delete)
        db.session.commit()
        return redirect(url_for('get_all_posts'))


if __name__ == "__main__":
    app.run(debug=True)