main.py

from flask import Flask, render_template, redirect, url_for, flash, request, 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 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, RegisterForm, LoginForm, CommentForm
from flask_gravatar import Gravatar
from functools import wraps
import os

app = Flask(__name__)
app.config['SECRET_KEY'] = os.environ.get("SECRET_KEY", '8BYkEfBA6O6donzWlSihBXox7C0sKR6b')
ckeditor = CKEditor(app)
Bootstrap(app)

##CONNECT TO DBl
app.config['SQLALCHEMY_DATABASE_URI'] = os.environ.get("DATABASE_URL", "sqlite:///blog.db")#'sqite:///blog.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)
Base = declarative_base()

login_manager = LoginManager()
login_manager.init_app(app)


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


gravatar = Gravatar(app, size=100, rating='g', default='retro', force_default=False,
                    force_lower=False, use_ssl=False, base_url=None)
##CONFIGURE TABLES
class User(UserMixin,db.Model,Base):
    __tablename__ = 'users'
    posts = relationship('BlogPost', back_populates="author")
    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(1000))
    comments = relationship("Comment", back_populates="comment_author")
# with app.app_context():
#     db.create_all()


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

    author_id = Column(Integer, 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")
# with app.app_context():
#     db.create_all()


class Comment(db.Model, Base):
    __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")

    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)

with app.app_context():
    db.create_all()



#Create admin decorator
def admin_only(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        #Write inside function what decorator will do
        #if user id != 1 , return abort error
        if current_user.id != 1:
            return abort(403)
        #sino, retornar con la funcion
        return f(*args, **kwargs)
    return decorated_function




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


@app.route('/register', methods=["GET", "POST"])
def register():
    form = RegisterForm()
    if request.method == "POST" and form.validate_on_submit():

        if User.query.filter_by(email=request.form.get("email")).first():
            flash("This email is already on use!")
            return redirect(url_for('login'))

        hash_and_salted_pass = generate_password_hash(
            request.form.get("password"),
            method='pbkdf2:sha256',
            salt_length=8
        )
        user_name = request.form.get("name")
        new_user = User(
            email=form.email.data,
            password=hash_and_salted_pass,
            name=form.name.data
        )
        db.session.add(new_user)
        db.session.commit()
        return redirect(url_for('get_all_posts', name=user_name))
    return render_template("register.html", form=form, current_user=current_user)


@app.route('/login', methods=["GET", "POST"])
def login():
    form = LoginForm()
    if request.method == "POST":
        email = form.email.data
        password = form.password.data

        user = User.query.filter_by(email=email).first()

        if not user:
            flash("That email doesnt exist,  try again!")
        elif not check_password_hash(user.password, password):
            flash("Wrong Password!")
            return redirect(url_for('login'))
        else:
            login_user(user)
            return redirect(url_for('get_all_posts', name=user.name))
    return render_template("login.html", form=form,  current_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):
    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,  current_user=current_user, form=form)


@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(debug=True)