main.py

from functools import wraps
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
import os

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

##CONNECT TO DB
app.config['SQLALCHEMY_DATABASE_URI'] = os.environ.get("DATABASE_URL")
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)


##CONFIGURE TABLES

class BlogPost(db.Model):
    __tablename__ = "blog_posts"
    id = db.Column(db.Integer, primary_key=True)
    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)

    # User
    author = relationship("User", back_populates="posts")
    author_id = db.Column(db.Integer, db.ForeignKey('user.id'))

    # Comment
    comments = relationship("Comment", back_populates="parent_post")


class Comment(db.Model):
    __tablename__ = "comments"
    id = db.Column(db.Integer, primary_key=True)
    text = db.Column(db.Text, nullable=False)
    date = db.Column(db.String(250), nullable=False)
    # User
    comment_author = relationship("User", back_populates="comments")
    author_id = db.Column(db.Integer, db.ForeignKey('user.id'))

    # Post
    post_id = db.Column(db.Integer, db.ForeignKey('blog_posts.id'))
    parent_post = relationship("BlogPost", back_populates="comments")


class User(UserMixin, db.Model):
    __tablename__ = "user"
    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)

    # Post
    posts = relationship("BlogPost", back_populates="author")

    # Comment
    comments = relationship("Comment", back_populates="comment_author")


db.create_all()

login_manager = LoginManager()
login_manager.init_app(app)

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(user_id)


def admin_only(function):
    @wraps(function)
    def decorated_function(*args, **kwargs):
        return function(*args, **kwargs) if current_user.id == 1 else abort(403)

    return decorated_function


@app.route('/')
def get_all_posts():
    posts = BlogPost.query.all()
    return render_template("index.html", all_posts=posts, user=current_user)


@app.route('/register', methods=['GET', 'POST'])
def register():
    form = RegisterForm()
    if form.validate_on_submit():
        if User.query.filter_by(email=form.email.data).first():
            flash("Already sign up email")
            return redirect(url_for('login'))
        new_user = User(email=form.email.data,
                        password=generate_password_hash(form.password.data, method='pbkdf2:sha256', salt_length=8),
                        name=form.name.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, user=current_user)


@app.route('/login', methods=['GET', 'POST'])
def login():
    form = LoginForm()
    if form.validate_on_submit():
        query_user = User.query.filter_by(email=form.email.data).first()
        if not query_user:
            flash('Email does not exit.')
            return redirect(url_for('login'))

        if check_password_hash(query_user.password, form.password.data):
            login_user(query_user)
            return redirect(url_for('get_all_posts'))
        else:
            flash("Password not correct")
            return redirect(url_for('login'))

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


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


@app.route("/post/<int:post_id>", methods=['GET', 'POST'])
def show_post(post_id):
    requested_post = BlogPost.query.get(post_id)
    form = CommentForm()
    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.data,
                              comment_author=current_user,
                              parent_post=requested_post,
                              date=date.today().strftime("%B %d, %Y")
                              )
        db.session.add(new_comment)
        db.session.commit()
    return render_template("post.html", post=requested_post, user=current_user, form=form)


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


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


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


@app.route("/edit-post/<int:post_id>", methods=['GET', 'POST'])
@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,
        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, user=current_user)


@app.route("/delete/<int:post_id>")
@admin_only
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)
    app.run(debug=True)