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app.py
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app.py
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import os
import re
import psycopg2
from flask import Flask, render_template, request, flash, redirect, session, g, abort, jsonify
import requests
from flask_debugtoolbar import DebugToolbarExtension
from sqlalchemy.exc import IntegrityError
from models import db, connect_db, User, VehicleTripCalculation, ShippingCalculation, FlightCalculation, ElectricityCalculation
from forms import RegisterForm, LoginForm, VehicleTripForm, ShippingForm, FlightForm, ElectricityForm
from footprint import get_all_vehicle_brands, get_vehicle_estimate, get_shipping_estimate, get_flight_estimate, get_electricity_estimate
CURR_USER_KEY = "curr_user"
SECRET_API_KEY = os.environ.get('CARBON_SECRET_KEY')
app = Flask(__name__)
uri = os.environ.get('DATABASE_URL', 'postgresql:///footprint_db')
if uri.startswith("postgres://"):
uri = uri.replace("postgres://", "postgresql://", 1)
app.config['SQLALCHEMY_DATABASE_URI'] = uri
DATABASE_URL = os.environ['DATABASE_URL']
conn = psycopg2.connect(DATABASE_URL, sslmode='require')
# app.config['SQLALCHEMY_DATABASE_URI'] = (
# os.environ.get('DATABASE_URL', 'postgresql:///footprint_db'))
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SQLALCHEMY_ECHO'] = True
app.config['SECRET_KEY'] = os.environ.get("SECRET_KEY", 'alsdajjdsad999999')
app.config['DEBUG_TB_INTERCEPT_REDIRECTS'] = False
debug = DebugToolbarExtension(app)
connect_db(app)
##############################
# User signup, logout, login #
##############################
@app.before_request
def add_user_to_g():
"""If we're logged in, add curr user to Flask global."""
if CURR_USER_KEY in session:
g.user = User.query.get(session[CURR_USER_KEY])
else:
g.user = None
def do_login(user):
"""Log in user."""
session[CURR_USER_KEY] = user.id
def do_logout():
"""Logout 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.
"""
if CURR_USER_KEY in session:
del session[CURR_USER_KEY]
form = RegisterForm()
if form.validate_on_submit():
try:
user = User.signup(
username=form.username.data,
password=form.password.data,
email=form.email.data,
)
db.session.commit()
except IntegrityError as e:
flash("Username already taken", 'danger')
return render_template('signup.html', form=form)
do_login(user)
return redirect("/choices")
else:
return render_template('signup.html', form=form)
@app.route('/login', methods=["GET", "POST"])
def login():
"""Handle user login."""
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("/choices")
flash("Invalid credentials.", 'danger')
return render_template('login.html', form=form)
@app.route('/logout')
def logout():
"""Handle logout of user."""
do_logout()
flash("You have successfully logged out.", 'success')
return redirect("/")
##############
# Start page #
##############
@app.route('/')
def introduce():
"""Show start_page"""
return render_template("start.html")
#######################
# Calculation choices #
#######################
@app.route('/choices', methods=['GET'])
def present_choices():
"""Present choices of calculation types to user"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
return render_template("choices.html")
###################
# Add My Car Form #
###################
@app.route('/add_my_car', methods=['GET'])
def choose_vehicle_model_id():
"""User will choose car brand and model in order to get the vehicle_model_id,
then user gets redirected to main vehicle emissions form"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
BRAND_LIST = get_all_vehicle_brands()
return render_template('calculation_forms/vehicle-form2.html', BRAND_LIST=BRAND_LIST)
@app.route('/get_models/<vehicle_brand_id>', methods=['GET'])
def make_request_for_brand_models(vehicle_brand_id):
"""This route is for providing the app.js file with models without exposing the SECRET_API_KEY"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
response = requests.get(url=f'https://www.carboninterface.com/api/v1/vehicle_makes/{vehicle_brand_id}/vehicle_models', headers={
'Authorization': f'Bearer {SECRET_API_KEY}',
'Content-Type': 'application/json'
})
data = response.json()
return(data)
@app.route('/add_my_car/<vehicle_model_id>', methods=['GET'])
def collect_vehicle_model_id(vehicle_model_id):
"""After choosing a vehicle, this route is fired to add the vehicle to our database"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
return redirect(f'/car_trip_form/{vehicle_model_id}' )
##########################
# Carbon Footprint Forms #
##########################
@app.route('/car_trip_form/<vehicle_model_id>', methods=['GET', 'POST'])
def present_vehicle_emissions_form(vehicle_model_id):
"""Now that a user has chosen a specific vehicle, they can now enter data needed for an emissions estimate.
The vehicle chosen will be added to user's vehicles"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
form = VehicleTripForm()
if form.validate_on_submit():
distance_unit = form.distance_unit.data
distance_value = form.distance_value.data
# emission_unit = form.emission_unit.data
emission_unit = request.form.get('emission_unit')
carbon = get_vehicle_estimate(distance_value, distance_unit, vehicle_model_id, emission_unit)
# Add new vehicle trip calculation instance into the database.
new_vehicle_trip = VehicleTripCalculation(user_id=g.user.id,
distance_value=distance_value,
distance_unit=distance_unit,
vehicle_model_id=vehicle_model_id,
carbon=carbon,
emission_unit=emission_unit
)
g.user.vehicle_calculations.append(new_vehicle_trip)
db.session.add(new_vehicle_trip)
db.session.commit()
user = User.query.get_or_404(g.user.id)
return render_template('result.html', carbon=carbon, emission_unit=emission_unit, user=user)
return render_template('calculation_forms/vehicle-trip.html', form=form)
@app.route('/shipping', methods=['GET', 'POST'])
def present_shipping_form():
"""User can put in data for calculating emissions from shipping"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
form = ShippingForm()
if form.validate_on_submit():
weight_unit = form.weight_unit.data
weight_value = form.weight_value.data
distance_unit = form.distance_unit.data
distance_value = form.distance_value.data
# transport_method = form.transport_method.data
transport_method = request.form.get('transport_method')
# emission_unit = form.emission_unit.data
emission_unit = request.form.get('emission_unit')
new_shipping_order = ShippingCalculation(
user_id=g.user.id,
distance_value=distance_value,
distance_unit=distance_unit,
weight_value=weight_value,
weight_unit=weight_unit,
transport_method=transport_method,
)
g.user.shipping_calculations.append(new_shipping_order)
db.session.add(new_shipping_order)
db.session.commit()
carbon = get_shipping_estimate(weight_unit, weight_value, distance_unit, distance_value, transport_method, emission_unit)
user = User.query.get_or_404(g.user.id)
return render_template('result.html', carbon=carbon, emission_unit=emission_unit, user=user)
return render_template('calculation_forms/shipping.html', form=form)
@app.route('/flight', methods=['GET', 'POST'])
def present_flight_form():
"""User can put in data for calculating emissions from a flight"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
form = FlightForm()
if form.validate_on_submit():
distance_unit = form.distance_unit.data
distance_value = form.distance_value.data
# emission_unit = form.emission_unit.data
emission_unit = request.form.get('emission_unit')
new_flight = FlightCalculation(
user_id=g.user.id,
distance_value=distance_value,
distance_unit=distance_unit,
)
g.user.flight_calculations.append(new_flight)
db.session.add(new_flight)
db.session.commit()
carbon = get_flight_estimate(distance_unit, distance_value, emission_unit)
user = User.query.get_or_404(g.user.id)
return render_template('result.html', carbon=carbon, emission_unit=emission_unit, user=user)
return render_template('calculation_forms/flights.html', form=form)
@app.route('/electricity', methods=['GET', 'POST'])
def present_electricity_form():
"""User can put in data for calculating emissions from electricity consumption"""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
form = ElectricityForm()
if form.validate_on_submit():
electricity_value=form.electricity_value.data
electricity_unit=form.electricity_unit.data
country = form.country.data
# emission_unit = form.emission_unit.data
emission_unit = request.form.get('emission_unit')
new_electricity = ElectricityCalculation(
user_id=g.user.id,
electricity_value=electricity_value,
electricity_unit=electricity_unit,
country=country
)
g.user.electricity_calculations.append(new_electricity)
db.session.add(new_electricity)
db.session.commit()
carbon = get_electricity_estimate(electricity_value, electricity_unit, country, emission_unit)
user = User.query.get_or_404(g.user.id)
return render_template('result.html', carbon=carbon, emission_unit=emission_unit, user=user)
return render_template('calculation_forms/electricity.html', form=form)
###########
# Profile #
###########
@app.route('/user/<int:user_id>', methods=['GET'])
def show_user_profile(user_id):
"""User should see a list of all their recent calculations,
as well as have access to a navbar to perform new calculations.
In the future, we want this to have an interactive graph that displays user emissions data over time."""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
user = User.query.get_or_404(user_id)
return render_template('profile.html',
vehicle_calculations=user.vehicle_calculations,
shipping_calculations=user.shipping_calculations,
flight_calculations=user.flight_calculations,
electricity_calculations=user.electricity_calculations,
user=user
)
@app.route('/user/data', methods=["GET", "POST"])
def get_user_vehicle_calc_data():
"""This route should return the json data from user vehicle emissions."""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
data = g.user.vehicle_calculations
dates = []
carbon = []
for calc in data:
if calc.emission_unit == 'lbs':
carbon_kg = calc.carbon / .45
carbon.append(carbon_kg)
elif calc.emission_unit == 'g':
carbon_kg = calc.carbon / 1000
carbon.append(carbon_kg)
elif calc.emission_unit == 'mt(metric tonnes)':
carbon_kg = calc.carbon * 1000
carbon.append(carbon_kg)
else:
carbon.append(calc.carbon)
dates.append(calc.timestamp)
return jsonify({"Carbon": carbon, "Dates": dates})
@app.route('/user/chart', methods=["GET"])
def show_user_carbon_line_chart():
"""User should see a line chart with every type of calculation made, tracking emissions over time."""
if not g.user:
flash("Access unauthorized.", "danger")
return redirect("/")
return render_template("chart.html")
@app.after_request
def add_header(req):
"""Add non-caching headers on every request."""
req.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
req.headers["Pragma"] = "no-cache"
req.headers["Expires"] = "0"
req.headers['Cache-Control'] = 'public, max-age=0'
return req