main.py

from flask import Flask, render_template, redirect, url_for, flash
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 sqlalchemy import Table, Column, Integer, ForeignKey
from sqlalchemy.ext.declarative import declarative_base
from flask_login import UserMixin, login_user, LoginManager, login_required, current_user, logout_user
from forms import CreatePostForm, CreateUserForm, LogInForm, CommentForm
from flask_gravatar import Gravatar
from functools import wraps

app = Flask(__name__)
app.config['SECRET_KEY'] = '8BYkEfBA6O6donzWlSihBXox7C0sKR6b'
ckeditor = CKEditor(app)
Bootstrap(app)

## RELATIVE DB BASE
Base = declarative_base()

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

##FLASK LOGIN
login_manager = LoginManager()
login_manager.init_app(app)

##FLASK GRAVATAR
gravatar = Gravatar(app,
                    size=100,
                    rating='g',
                    default='retro',
                    force_default=False,
                    force_lower=False,
                    use_ssl=False,
                    base_url=None)

@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))

##CONFIGURE TABLES

class BlogPost(db.Model, Base):
    __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 User(UserMixin, db.Model):
    __tablename__ = "users"
    posts = relationship("BlogPost", back_populates="author")
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(250), unique=True, nullable=False)
    password = db.Column(db.String(250), nullable=False)
    name = db.Column(db.String(250), nullable=False)
    comments = relationship("Comment", back_populates="comment_author")

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

db.create_all()

##DECORATOR FOR ADMIN ONLY PAGES
def admin_only(function):
    @wraps(function)
    def wrapper_function(*args, **kwargs):
        if current_user.is_authenticated and int(current_user.id) == 1 :
            pass
        else:
            return redirect(url_for("get_all_posts"))
        return function(*args, **kwargs)
    return wrapper_function

@app.route('/')
def get_all_posts():
    posts = BlogPost.query.all()
    if current_user.is_authenticated:
        user_id = current_user.id
    else: 
        user_id = 0
    return render_template("index.html", all_posts=posts, logged_in=current_user.is_authenticated, user_id=user_id)


@app.route('/register', methods=["POST", "GET"])
def register():
    form = CreateUserForm()
    if form.validate_on_submit():
        if User.query.filter_by(email=form.email.data).first():
            flash("Such user exists. You're redirected to the login page")
            return redirect(url_for("login"))
        else:
            hashed_salted_password = generate_password_hash(
                password=form.password.data,
                method='pbkdf2:sha256',
                salt_length=8
            )
            new_user = User(
                name=form.name.data,
                password=hashed_salted_password,
                email=form.email.data
            )
            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, logged_in=current_user.is_authenticated)


@app.route('/login', methods=["POST", "GET"])
def login():
    form = LogInForm()
    if form.validate_on_submit():
        email = form.email.data
        password = form.password.data
        requested_user = User.query.filter_by(email=email).first()
        if requested_user:
            if check_password_hash(requested_user.password, password):
                login_user(requested_user)
                return redirect(url_for("get_all_posts"))
            else:
                flash("Password isn't correct.")
                return redirect(url_for('login'))
        else:
            flash("Such user doesn't exist")
            return redirect(url_for('login'))

    return render_template("login.html", form=form, logged_in=current_user.is_authenticated)


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


@app.route("/post/<int:post_id>", methods=["POST", "GET"])
def show_post(post_id):
    requested_post = BlogPost.query.get(post_id)
    form = CommentForm()
    if form.validate_on_submit():
        if current_user.is_authenticated:
            new_comment = Comment(
                text = form.comment.data,
                comment_author = current_user,
                parent_post = requested_post
            )
            db.session.add(new_comment)
            db.session.commit()
        else:
            flash("To post comments you have to log in.")
            return redirect(url_for('login'))
    return render_template("post.html", post=requested_post, form=form, logged_in=current_user.is_authenticated)


@app.route("/about")
def about():
    return render_template("about.html", logged_in=current_user.is_authenticated)


@app.route("/contact")
def contact():
    return render_template("contact.html", logged_in=current_user.is_authenticated)


@app.route("/new-post", methods=["POST", "GET"])
@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, logged_in=current_user.is_authenticated)


@app.route("/edit-post/<int:post_id>", methods=["POST", "GET"])
@admin_only
def edit_post(post_id):
    post = BlogPost.query.get(post_id)
    edit_form = CreatePostForm(
        title=post.title,
        subtitle=post.subtitle,
        img_url=post.img_url,
        author=current_user,
        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.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, logged_in=current_user.is_authenticated)


@app.route("/delete/<int:post_id>")
def delete_post(post_id):
    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(host='0.0.0.0', port=5000)