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| import os
from cs50 import SQL
from flask import Flask, flash, redirect, render_template, request, session
from flask_session import Session
from werkzeug.security import check_password_hash, generate_password_hash
from helpers import apology, login_required, lookup, usd
app = Flask(__name__)
app.jinja_env.filters["usd"] = usd
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_TYPE"] = "filesystem"
Session(app)
db = SQL("sqlite:///finance.db")
@app.after_request
def after_request(response):
"""Ensure responses aren't cached"""
response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
response.headers["Expires"] = 0
response.headers["Pragma"] = "no-cache"
return response
@app.route("/")
@login_required
def index():
"""Show portfolio of stocks"""
rows = db.execute("SELECT * FROM portfolio WHERE userid = ?", session["user_id"])
cash_result = db.execute("SELECT cash FROM users WHERE id = ?", session["user_id"])
cash = cash_result[0]['cash']
sum = cash
for row in rows:
stock_info = lookup(row['symbol'])
if stock_info is None:
continue
row['name'] = stock_info['name']
try:
price_numeric = float(stock_info['price'])
except (ValueError, TypeError):
continue
row['price'] = price_numeric
row['total'] = price_numeric * row['shares']
sum = sum + row['total']
row['price_usd'] = usd(price_numeric)
row['total_usd'] = usd(row['total'])
return render_template("index.html", rows=rows, cash=usd(cash), sum=usd(sum))
@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
"""Buy shares of stock"""
if request.method == "GET":
return render_template("buy.html")
else:
symbol = request.form.get("symbol")
shares = request.form.get("shares")
quote = lookup(symbol)
if not symbol:
return apology("Please provide a stock symbol!", 400)
if not shares:
return apology("Please provide number of shares!", 400)
if quote == None:
return apology("Invalid stock symbol!", 400)
try:
shares = float(shares)
if shares != int(shares):
return apology("Shares must be a whole number (no fractions)!", 400)
shares = int(shares)
if shares <= 0:
return apology("Shares must be a positive number!", 400)
except (ValueError, TypeError):
return apology("Shares must be a numeric value!", 400)
symbol = symbol.upper()
try:
price = float(quote['price'])
except (ValueError, TypeError):
return apology("Invalid stock price data!", 400)
purchase = price * shares
balance_result = db.execute("SELECT cash FROM users WHERE id = ?", session["user_id"])
balance = balance_result[0]['cash']
remainder = balance - purchase
if remainder < 0:
return apology("Insufficient money!", 400)
db.execute("UPDATE users SET cash = ? WHERE id = ?", remainder, session["user_id"])
existing = db.execute("SELECT shares FROM portfolio WHERE userid = ? AND symbol = ?",
session["user_id"], symbol)
if existing:
old_shares = existing[0]['shares']
new_shares = old_shares + shares
db.execute("UPDATE portfolio SET shares = ? WHERE userid = ? AND symbol = ?",
new_shares, session["user_id"], symbol)
else:
db.execute("INSERT INTO portfolio (userid, symbol, shares) VALUES (?, ?, ?)",
session["user_id"], symbol, shares)
db.execute("INSERT INTO history (userid, symbol, shares, method, price) VALUES (?, ?, ?, ?, ?)",
session["user_id"], symbol, shares, 'Buy', price)
flash(f"Bought {shares} shares of {symbol} costing {usd(purchase)}")
return redirect("/")
@app.route("/history")
@login_required
def history():
"""Show history of transactions"""
rows = db.execute("SELECT * FROM history WHERE userid = ?", session["user_id"])
return render_template("history.html", rows=rows)
@app.route("/login", methods=["GET", "POST"])
def login():
"""Log user in"""
session.clear()
if request.method == "POST":
username = request.form.get("username")
if not username:
return apology("must provide username", 403)
password = request.form.get("password")
if not password:
return apology("must provide password", 403)
rows = db.execute(
"SELECT * FROM users WHERE username = ?", username
)
if len(rows) != 1 or not check_password_hash(
rows[0]["hash"], password
):
return apology("invalid username and/or password", 403)
session["user_id"] = rows[0]["id"]
return redirect("/")
else:
return render_template("login.html")
@app.route("/logout")
def logout():
"""Log user out"""
session.clear()
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:
symbol = lookup(request.form.get("symbol"))
if symbol == None:
return apology("invalid stock symbol", 400)
else:
return render_template("quoted.html", symbol=symbol)
@app.route("/register", methods=["GET", "POST"])
def register():
"""Register user"""
session.clear()
if request.method == "POST":
if not request.form.get("username"):
return apology("Username is required!", 400)
elif not request.form.get("password"):
return apology("Password is required!", 400)
elif not request.form.get("confirmation"):
return apology("Confirmation is required!", 400)
password = request.form.get("password")
confirmation = request.form.get("confirmation")
if not password or not confirmation:
return apology("Password fields cannot be empty!", 400)
if password != confirmation:
return apology("Passwords do not match!", 400)
username = request.form.get("username")
hash = generate_password_hash(password)
rows = db.execute("SELECT * FROM users WHERE username = ?", username)
if len(rows) != 0:
return apology("Username already exists!", 400)
db.execute("INSERT INTO users (username, hash) VALUES (?, ?)", username, hash)
id = db.execute("SELECT id FROM users WHERE username = ?", username)
session["user_id"] = id[0]["id"]
return redirect("/login")
else:
return render_template("register.html")
@app.route("/sell", methods=["GET", "POST"])
@login_required
def sell():
"""Sell shares of stock"""
if request.method == "GET":
portfolio = db.execute("SELECT symbol FROM portfolio WHERE userid = ?", session["user_id"])
return render_template("sell.html", portfolio=portfolio)
else:
symbol = request.form.get("symbol")
shares = request.form.get("shares")
if not symbol:
return apology("Must provide valid stock symbol!", 400)
quote = lookup(symbol)
if quote is None:
return apology("Invalid stock symbol!", 400)
rows = db.execute("SELECT * FROM portfolio WHERE userid = ? AND symbol = ?",
session["user_id"], symbol.upper())
if len(rows) != 1:
return apology("Must provide valid stock symbol!", 400)
if not shares:
return apology("Must provide number of shares!", 400)
try:
shares = float(shares)
if shares != int(shares):
return apology("Shares must be a whole number (no fractions)!", 400)
shares = int(shares)
if shares <= 0:
return apology("Shares must be a positive number!", 400)
except (ValueError, TypeError):
return apology("Shares must be a numeric value!", 400)
oldshares = rows[0]['shares']
if shares > oldshares:
return apology("Shares sold can't exceed shares owned", 400)
try:
price = float(quote['price'])
except (ValueError, TypeError):
return apology("Invalid stock price data!", 400)
sold = price * shares
cash_result = db.execute("SELECT cash FROM users WHERE id = ?", session["user_id"])
cash = cash_result[0]['cash']
cash = cash + sold
db.execute("UPDATE users SET cash = ? WHERE id = ?", cash, session["user_id"])
newshares = oldshares - shares
if newshares > 0:
db.execute("UPDATE portfolio SET shares = ? WHERE userid = ? AND symbol = ?",
newshares, session["user_id"], symbol)
else:
db.execute("DELETE FROM portfolio WHERE symbol = ? AND userid = ?",
symbol, session["user_id"])
db.execute("INSERT INTO history (userid, symbol, shares, method, price) VALUES (?, ?, ?, ?, ?)",
session["user_id"], symbol, shares, 'Sell', price)
flash(f"Sold {shares} shares of {symbol.upper()} for {usd(sold)}")
return redirect("/")
|
