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app.py
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app.py
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import os
from dotenv import load_dotenv
from flask import Flask, render_template, request, flash, redirect, session, g
from flask_debugtoolbar import DebugToolbarExtension
from sqlalchemy.exc import IntegrityError
from werkzeug.exceptions import Unauthorized
from forms import UserAddForm, LoginForm, MessageForm, CsrfForm, EditForm
from models import db, connect_db, User, Message, DEFAULT_IMAGE_URL, DEFAULT_HEADER_IMAGE_URL
load_dotenv()
CURR_USER_KEY = "curr_user"
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = os.environ['DATABASE_URL']
app.config['SQLALCHEMY_ECHO'] = False
app.config['DEBUG_TB_INTERCEPT_REDIRECTS'] = False
app.config['SECRET_KEY'] = os.environ['SECRET_KEY']
# toolbar = DebugToolbarExtension(app)
connect_db(app)
##############################################################################
# User signup/login/logout
@app.before_request
def add_user_and_csrf_to_g():
"""If we're logged in, add curr user and csrf form to Flask global."""
if CURR_USER_KEY in session:
g.user = User.query.get(session[CURR_USER_KEY])
g.csrf_form = CsrfForm()
else:
g.user = None
def do_login(user):
"""Log in user."""
session[CURR_USER_KEY] = user.id
def do_logout():
"""Log out user."""
if CURR_USER_KEY in session:
del session[CURR_USER_KEY]
@app.route('/signup', methods=["GET", "POST"])
def signup():
"""Handle user signup.
Create new user and add to DB. Redirect to home page.
If form not valid, present form.
If the there already is a user with that username: flash message
and re-present form.
"""
do_logout()
form = UserAddForm()
if form.validate_on_submit():
try:
user = User.signup(
username=form.username.data,
password=form.password.data,
email=form.email.data,
image_url=form.image_url.data or User.image_url.default.arg,
)
db.session.commit()
except IntegrityError:
flash("Username already taken", 'danger')
return render_template('users/signup.html', form=form)
do_login(user)
return redirect("/")
else:
return render_template('users/signup.html', form=form)
@app.route('/login', methods=["GET", "POST"])
def login():
"""Handle user login and redirect to homepage on success."""
form = LoginForm()
if form.validate_on_submit():
user = User.authenticate(
form.username.data,
form.password.data,
)
if user:
do_login(user)
flash(f"Hello, {user.username}!", "success")
return redirect("/")
flash("Invalid credentials.", 'danger')
return render_template('users/login.html', form=form)
@app.post('/logout')
def logout():
"""Handle logout of user and redirect to homepage."""
if g.csrf_form.validate_on_submit():
do_logout()
flash("User Logged Out")
return redirect("/login")
##############################################################################
# General user routes:
@app.get('/users')
def list_users():
"""Page with listing of users.
Can take a 'q' param in querystring to search by that username.
"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
search = request.args.get('q')
if not search:
users = User.query.all()
else:
users = User.query.filter(User.username.like(f"%{search}%")).all()
return render_template('users/index.html', users=users)
@app.get('/users/<int:user_id>')
def show_user(user_id):
"""Show user profile."""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
user = User.query.get_or_404(user_id)
return render_template('users/show.html', user=user)
@app.get('/users/<int:user_id>/following')
def show_following(user_id):
"""Show list of people this user is following."""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
user = User.query.get_or_404(user_id)
return render_template('users/following.html', user=user)
@app.get('/users/<int:user_id>/followers')
def show_followers(user_id):
"""Show list of followers of this user."""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
user = User.query.get_or_404(user_id)
return render_template('users/followers.html', user=user)
@app.get("/users/<int:user_id>/likes")
def show_favorite_warbles(user_id):
"""show favorite warbles"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
user = User.query.get(user_id)
return render_template('users/liked_warbles.html', user=user)
@app.post('/users/follow/<int:follow_id>')
def start_following(follow_id):
"""Add a follow for the currently-logged-in user.
Redirect to following page for the current for the current user.
"""
if not g.user or not g.csrf_form.validate_on_submit():
flash("Access unauthorized.", "danger")
return redirect("/")
followed_user = User.query.get_or_404(follow_id)
if followed_user == g.user:
flash("You can not follow yourself.", "danger")
return redirect("/users")
g.user.following.append(followed_user)
db.session.commit()
return redirect(f"/users/{g.user.id}/following")
@app.post('/users/stop-following/<int:follow_id>')
def stop_following(follow_id):
"""Have currently-logged-in-user stop following this user.
Redirect to following page for the current for the current user.
"""
if not g.user or not g.csrf_form.validate_on_submit():
flash("Access unauthorized.", "danger")
return redirect("/")
followed_user = User.query.get_or_404(follow_id)
g.user.following.remove(followed_user)
db.session.commit()
return redirect(f"/users/{g.user.id}/following")
@app.route('/users/profile', methods=["GET", "POST"])
def profile():
"""Update profile for current user."""
form = EditForm(obj=g.user)
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
if form.validate_on_submit():
edit_user = User.authenticate(g.user.username, form.password.data)
if edit_user:
g.user.username = form.username.data
g.user.email = form.email.data
g.user.image_url = form.image_url.data or DEFAULT_IMAGE_URL
g.user.header_image_url = form.header_image_url.data or DEFAULT_HEADER_IMAGE_URL
g.user.bio = form.bio.data or " "
try:
db.session.commit()
return redirect(f"/users/{g.user.id}")
except IntegrityError:
db.session.rollback()
form.username.errors = ["Username Already Taken"]
else:
form.password.errors = ["Bad Password"]
return render_template('/users/edit.html', user=g.user, form=form)
@app.post('/users/delete')
def delete_user():
"""Delete user.
Redirect to signup page.
"""
if not g.user or not g.csrf_form.validate_on_submit():
flash("Access unauthorized.", "danger")
return redirect("/")
# cascade kicks in here so no need to delete messages separately (must have delete cascade in models though!)
User.query.filter_by(id=g.user.id).delete()
db.session.commit()
do_logout()
return redirect("/signup")
##############################################################################
# Messages routes:
@app.route('/messages/new', methods=["GET", "POST"])
def add_message():
"""Add a message:
Show form if GET. If valid, update message and redirect to user page.
"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
form = MessageForm()
if form.validate_on_submit():
msg = Message(text=form.text.data)
g.user.messages.append(msg)
db.session.commit()
return redirect(f"/users/{g.user.id}")
return render_template('messages/create.html', form=form)
@app.get('/messages/<int:message_id>')
def show_message(message_id):
"""Show a message."""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
msg = Message.query.get_or_404(message_id)
return render_template('messages/show.html', message=msg)
@app.post('/messages/<int:message_id>/delete')
def delete_message(message_id):
"""Delete a message.
Check that this message was written by the current user.
Redirect to user page on success.
"""
msg = Message.query.get_or_404(message_id)
if not g.user or (msg.user_id != g.user.id):
flash("Access unauthorized.", "danger")
return redirect("/")
if g.csrf_form.validate_on_submit():
db.session.delete(msg)
db.session.commit()
return redirect(f"/users/{g.user.id}")
else:
raise Unauthorized()
@app.post("/message/<int:message_id>/favorite")
def handle_favorites(message_id):
"""handle the favoriting/unfavoriting of a function"""
# page = request.get(url)
# breakpoint()
if not g.user or not g.csrf_form.validate_on_submit():
flash("Access unauthorized.", "danger")
return redirect('/')
msg = Message.query.get_or_404(message_id)
origin_url = request.form.get('origin_url')
if msg not in g.user.liked_messages:
g.user.liked_messages.append(msg)
db.session.commit()
else:
g.user.liked_messages.remove(msg)
db.session.commit()
return redirect(origin_url)
##############################################################################
# Homepage and error pages
@app.get('/')
def homepage():
"""Show homepage:
- anon users: no messages
- logged in: 100 most recent messages of self & followed_users
"""
if g.user:
following_ids = [user.id for user in g.user.following] + [g.user.id]
messages = (Message
.query
.filter(Message.user_id.in_(following_ids))
.order_by(Message.timestamp.desc())
.limit(100)
.all())
return render_template('home.html',
messages=messages)
return render_template('home-anon.html')
@app.after_request
def add_header(response):
"""Add non-caching headers on every request."""
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
response.cache_control.no_store = True
return response