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application.py
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application.py
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import os
import sqlite3
from flask import Flask, flash, redirect, render_template, request, session
from flask_session import Session
from tempfile import mkdtemp
from werkzeug.exceptions import default_exceptions, HTTPException, InternalServerError
from werkzeug.security import check_password_hash, generate_password_hash
from datetime import datetime
from helpers import apology, login_required, lookup, usd
# Configure application
app = Flask(__name__)
# Ensure templates are auto-reloaded
app.config["TEMPLATES_AUTO_RELOAD"] = True
# Ensure responses aren't cached
@app.after_request
def after_request(response):
response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
response.headers["Expires"] = 0
response.headers["Pragma"] = "no-cache"
return response
# Custom filter
app.jinja_env.filters["usd"] = usd
# Configure session to use filesystem (instead of signed cookies)
app.config["SESSION_FILE_DIR"] = mkdtemp()
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_TYPE"] = "filesystem"
Session(app)
#DATABASE name for this app
DATABASE = './finance.db'
# Configure sqlite3 libraray to connect to Database, to return reponse in dict form rather than tuple
def get_db_connection():
conn = sqlite3.connect(DATABASE)
conn.row_factory = sqlite3.Row
return conn
# Make sure API key is set
if not os.environ.get("API_KEY"):
raise RuntimeError("API_KEY not set")
# Calculate share counts user owns using stockes database rows
def calc_shares(rows):
scounts = {}
for row in rows:
if not scounts.get(row["symbol"], 0):
scounts[row["symbol"]] = 0
scounts[row["symbol"]] += row["shares"]
return scounts
@app.route("/")
@login_required
def index():
"""Show portfolio of stocks"""
# Connect to database to query for required information to display
conn = get_db_connection()
cursor = conn.cursor()
# Query database for current user's all transactions and integrate them in dict with symbol and total shares for the symbol
cursor.execute("SELECT * FROM stockes WHERE user_id = (?)", [session["user_id"]])
rows = cursor.fetchall()
# Dict of share counts
scounts = calc_shares(rows)
# Total cash that user owns
cursor.execute("SELECT cash FROM users WHERE username = (?)", [session["username"]])
rows = cursor.fetchall()
users_cash = rows[0]["cash"]
# Lookup company name, current price for each symbol in user's transaction
used_cash = 0
result = []
for symbol in scounts.keys():
vals = lookup(symbol)
obj = {}
obj["name"] = vals["name"]
obj["price"] = vals["price"]
obj["symbol"] = symbol
obj["shares"] = scounts[symbol]
obj["total"] = vals["price"] * scounts[symbol]
used_cash += obj["total"]
result.append(obj)
remain_cash = users_cash - used_cash
total_cash = users_cash + used_cash
conn.close()
return render_template("index.html", result=result, remain_cash=remain_cash, total_cash=total_cash)
@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
"""Buy shares of stock"""
if request.method == "POST":
# Ensure symbol was submitted
if not request.form.get("symbol"):
return apology("must provide symbol", 403)
# Ensure shares were submitted
elif not request.form.get("shares"):
return apology("must provide shares", 403)
res = lookup(request.form.get("symbol"))
# Ensure shares submitted were positive integers
if int(request.form.get("shares")) <= 0:
return apology("must provide valid shares", 403)
elif not res:
return apology("must provide valid symbol", 403)
current_share_price = float(res["price"])
number_of_shares = int(request.form.get("shares"))
# Connect to database
conn = get_db_connection()
cursor = conn.cursor()
cursor.execute("SELECT cash FROM users WHERE username = (?)", [session["username"]])
rows = cursor.fetchall()
# Check if user is eligible to buy stocks
current_balance = int(rows[0]["cash"])
if current_balance < current_share_price * number_of_shares:
return apology("Sorry! You cannot afford the number of shares at the current price.", 400)
symbol = res["symbol"]
tdate = datetime.now().strftime('%Y/%m/%d %H:%M:%S')
# Store new purchase data into database
cursor.execute("INSERT INTO stockes(symbol, shares, price, user_id, date) VALUES (?, ?, ?, ?, ?)", [symbol, number_of_shares, current_share_price, session["user_id"], tdate])
conn.commit()
remain_cash = current_balance - (number_of_shares * current_share_price)
# Make changes in user to show current available cash
cursor.execute("UPDATE users SET cash = (?) WHERE id = (?)", [remain_cash, session["user_id"]])
conn.commit()
conn.close()
# Flash user message
flash("Bought!")
# Redirect user to index
return redirect("/")
else:
return render_template("buy.html")
@app.route("/history")
@login_required
def history():
"""Show history of transactions"""
# Connect to database
conn = get_db_connection()
cursor = conn.cursor()
cursor.execute("SELECT * FROM stockes WHERE user_id = (?)", [session["user_id"]])
rows = cursor.fetchall()
return render_template("history.html", rows=rows)
@app.route("/login", methods=["GET", "POST"])
def login():
"""Log user in"""
# Forget any user_id
session.clear()
# User reached route via POST (as by submitting a form via POST)
if request.method == "POST":
# Ensure username was submitted
if not request.form.get("username"):
return apology("must provide username", 403)
# Ensure password was submitted
elif not request.form.get("password"):
return apology("must provide password", 403)
# Query database for username
conn = get_db_connection()
cursor = conn.cursor()
cursor.execute("SELECT * FROM users WHERE username = (?)", [request.form.get("username")])
rows = cursor.fetchall()
conn.close()
# Ensure username exists and password is correct
if len(rows) != 1 or not check_password_hash(rows[0]["hash"], request.form.get("password")):
return apology("invalid username and/or password", 403)
# Remember which user has logged in
session["user_id"] = rows[0]["id"]
session["username"] = rows[0]["username"]
# Redirect user to home page
return redirect("/")
# User reached route via GET (as by clicking a link or via redirect)
else:
return render_template("login.html")
@app.route("/logout")
def logout():
"""Log user out"""
# Forget any user_id
session.clear()
# Redirect user to login form
return redirect("/")
@app.route("/quote", methods=["GET", "POST"])
@login_required
def quote():
"""Get stock quote."""
if request.method == "GET":
return render_template("quote.html")
else:
res = lookup(request.form.get("symbol"))
# If symbol does not exits, render apology
if not res:
return apology("Symbol doesn't exit", 404)
else:
return render_template("quoted.html", res=res)
@app.route("/register", methods=["GET", "POST"])
def register():
"""Register user"""
if request.method == "POST":
equal = request.form.get("password") == request.form.get("confirm_password")
# Connect to database
conn = get_db_connection()
cursor = conn.cursor()
# Ensure username was submitted
if not request.form.get("username"):
return apology("must provide username", 403)
# Ensure password and confirm password were submitted and are equal
elif not request.form.get("password") or not request.form.get("confirm_password") or not equal:
return apology("must provide password", 403)
username = request.form.get("username")
hash = generate_password_hash(request.form.get("password"))
# Check if username already exists
cursor.execute("SELECT * FROM users WHERE username = (?)", [username])
rows = cursor.fetchall()
if len(rows) == 1:
return apology("username already taken", 403)
# Store new user's data into database
cursor.execute("INSERT INTO users (username, hash) VALUES (?, ?)", [username, hash])
conn.commit()
# Flash user message
flash("Registered!")
# Extract user'id to login
cursor.execute("SELECT * FROM users WHERE username = (?)", [username])
rows = cursor.fetchall()
# Log user in and redirect to "/"
session["user_id"] = rows[0]["id"]
session["username"] = rows[0]["username"]
conn.close()
return redirect("/")
else:
return render_template("register.html")
@app.route("/sell", methods=["GET", "POST"])
@login_required
def sell():
"""Sell shares of stock"""
if request.method == "GET":
# Connect to database
conn = get_db_connection()
cursor = conn.cursor()
# Query for stocks and shares for stocks that user owns
cursor.execute("SELECT * FROM stockes WHERE user_id = (?)", [session["user_id"]])
rows = cursor.fetchall()
# Dict of share counts
scounts = calc_shares(rows)
# Send list of stockes that user owns
stockes = list(scounts.keys())
conn.close()
return render_template("sell.html", stockes=stockes)
else:
# Connect to database
conn = get_db_connection()
cursor = conn.cursor()
# Query for stocks and shares for stocks that user owns
cursor.execute("SELECT * FROM stockes WHERE user_id = (?)", [session["user_id"]])
rows = cursor.fetchall()
# Dict of share counts
scounts = calc_shares(rows)
share_to_sell = int(request.form.get("shares"))
symbol = request.form.get("symbol")
# Ensure symbol was submitted
if not symbol:
return apology("must provide symbol", 403)
# Ensure shares were submitted
elif not share_to_sell:
return apology("must provide shares", 403)
# Check shares count is positive and user owns <= share_count provided
if share_to_sell <= 0 or share_to_sell > scounts[symbol]:
return apology("must provide valid shares", 403)
tdate = datetime.now().strftime('%Y/%m/%d %H:%M:%S')
# Current cash available with user
cursor.execute("SELECT cash FROM users WHERE id = (?)", [session["user_id"]])
rows = cursor.fetchall()
current_cash = rows[0]["cash"]
current_price = lookup(symbol)["price"]
remain_cash = share_to_sell * current_price + current_cash
# Make changes to stockes database
cursor.execute("INSERT INTO stockes(symbol, shares, price, user_id, date) VALUES (?, ?, ?, ?, ?)", [symbol, -share_to_sell, current_price, session["user_id"], tdate])
conn.commit()
# Make changes in user to show current available cash
cursor.execute("UPDATE users SET cash = (?) WHERE id = (?)", [remain_cash, session["user_id"]])
conn.commit()
conn.close()
# Flask message
flash("Sold!")
return redirect("/")
@app.route("/change_password", methods=["GET", "POST"])
def change_password():
""" Change password """
# User reached route via GET
if request.method == "GET":
return render_template("change_password.html")
else:
# User reached route via POST (as by submitting a form via POST)
if request.method == "POST":
# Ensure username was submitted
if not request.form.get("username"):
return apology("must provide username", 403)
# Ensure new password was submitted
elif not request.form.get("newpassword"):
return apology("must provide new password", 403)
# Ensure password was submitted
elif not request.form.get("password"):
return apology("must provide password", 403)
# Query database for username
conn = get_db_connection()
cursor = conn.cursor()
cursor.execute("SELECT * FROM users WHERE username = (?)", [request.form.get("username")])
rows = cursor.fetchall()
# Ensure username exists and password is correct
if len(rows) != 1 or not check_password_hash(rows[0]["hash"], request.form.get("password")):
return apology("invalid username and/or password", 403)
username = request.form.get("username")
hash = generate_password_hash(request.form.get("newpassword"))
# Store new password into database
cursor.execute("UPDATE users SET hash = (?) WHERE username = (?)", [hash, username])
conn.commit()
# Flash user message
flash("Your password is changed!")
# Redirect user to home page
return redirect("/")
@app.route("/add_cash", methods=["GET", "POST"])
@login_required
def add_cash():
"""Add cash"""
if request.method == "POST":
# Ensure valid addcash was submitted
if not request.form.get("addcash"):
return apology("must provide value", 403)
elif int(request.form.get("addcash")) <= 0:
return apology("must provide valid value", 403)
# Connect to database
conn = get_db_connection()
cursor = conn.cursor()
# Extract current cash value for this user
cursor.execute("SELECT cash FROM users WHERE username = (?)", [session["username"]])
rows = cursor.fetchall()
current_cash = rows[0]["cash"]
updated_cash = current_cash + int(request.form.get("addcash"))
# Store new cash data into user's into database
cursor.execute("UPDATE users SET cash = (?) WHERE username = (?)", [updated_cash, session["username"]])
conn.commit()
conn.close()
return redirect("/")
else:
return render_template("add_cash.html")
def errorhandler(e):
"""Handle error"""
if not isinstance(e, HTTPException):
e = InternalServerError()
return apology(e.name, e.code)
# Listen for errors
for code in default_exceptions:
app.errorhandler(code)(errorhandler)