main.py

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
from functools import wraps
from sqlalchemy.ext.declarative import declarative_base

app = Flask(__name__)
# app.config['SECRET_KEY'] = os.urandom(16)
app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY')
ckeditor = CKEditor(app)
Bootstrap(app)
login_manager = LoginManager()
login_manager.init_app(app)
Base = declarative_base()
gravatar = Gravatar(app, size=100, rating='g', default='retro', force_default=False, force_lower=False, use_ssl=False,
                    base_url=None)

# CONNECT TO DB
app.config['SQLALCHEMY_DATABASE_URI'] = os.environ.get('DATABASE_URL', 'sqlite:///blog.db')
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)
    # Create Foreign Key, "users.id" the users refers to the table name of User.
    author_id = db.Column(db.Integer, db.ForeignKey("users.id"))
    # Create reference to the User object, the "posts" refers to the posts property in the User class.
    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)
    # ***************Parent Relationship*************#
    comments = relationship("Comment", back_populates="parent_post")


class User(UserMixin, db.Model):
    __tablename__ = "users"
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(250), nullable=False)
    email = db.Column(db.String(250), unique=True, nullable=False)
    password = db.Column(db.String(250), nullable=False)
    # This will act like a List of BlogPost objects attached to each User.
    # The "author" refers to the author property in the BlogPost class.
    posts = relationship("BlogPost", back_populates="author")
    comments = relationship("Comment", back_populates="comment_author")


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


def admin_only(function):
    @wraps(function)
    def wrapper_function(*args, **kwargs):
        if not current_user.is_authenticated or current_user.id != 1:
            return abort(403)
        else:
            return function(*args, **kwargs)

    return wrapper_function


# Create all the tables in the database
db.create_all()


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


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


@app.route('/register', methods=['GET', 'POST'])
def register():
    form = RegisterForm()
    if form.validate_on_submit():
        email_add = form.email.data
        if User.query.filter_by(email=email_add).first():
            flash('User email already registered, log in instead')
            return redirect(url_for('login'))
        else:
            new_user = User(
                name=form.name.data,
                email=email_add,
                password=generate_password_hash(form.password.data, method='pbkdf2:sha256', salt_length=8)
            )
            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)


@app.route('/login', methods=['GET', 'POST'])
def login():
    form = LoginForm()
    if form.validate_on_submit():
        email_add = form.email.data
        user = User.query.filter_by(email=email_add).first()
        if user:
            if check_password_hash(user.password, form.password.data):
                login_user(user)
                return redirect(url_for('get_all_posts'))
            else:
                flash('Password incorrect, try again')
                return redirect(url_for('login'))
        else:
            flash('That email does not exist. Please register or try another email')
            return redirect(url_for('login'))

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


@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):
    form = CommentForm()
    requested_post = BlogPost.query.get(post_id)
    if form.validate_on_submit():
        comment = form.comment_text.data
        if not current_user.is_authenticated:
            flash('You need to login, or register to comment.')
            return redirect(url_for('login'))
        else:
            new_comment = Comment(
                text=comment,
                comment_author=current_user,
                parent_post=requested_post
            )
            db.session.add(new_comment)
            db.session.commit()

            return redirect(url_for('show_post', post_id=post_id))

    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")


@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, current_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,
        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>")
@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='localhost', port=5000, debug=True)