application.py

import os

from cs50 import SQL
from flask import Flask, flash, jsonify, 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 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)

# Configure CS50 Library to use SQLite database
db = SQL("sqlite:///finance.db")

# Make sure API key is set
if not os.environ.get("API_KEY"):
    raise RuntimeError("API_KEY not set")


@app.route("/")
@login_required
def index():
    """Show portfolio of stocks"""
    rows = db.execute("SELECT cash FROM users WHERE id = :id", id=session["user_id"])
    balance = rows[0]['cash']
    grandtotal = balance
    rows = db.execute("SELECT symbol FROM tranzact WHERE user_id=:id", id=session["user_id"])
    symbols = []
    for row in rows:
        symbols.append(row['symbol'])
    symbols = list(set(symbols))
    data = []
    print(symbols)
    for i in range(len(symbols)):
        rows = db.execute("SELECT symbol, SUM(shares) FROM tranzact WHERE user_id=:id AND symbol=:symbol",
                          id=session["user_id"], symbol=symbols[i])

        quote = lookup(symbols[i])
        rows[0]['price'] = quote['price']
        rows[0]['name'] = quote['name']
        rows[0]['symbol'] = quote['symbol']
        rows[0]['total'] = rows[0]['SUM(shares)']*rows[0]['price']
        if rows[0]['SUM(shares)'] > 0:
            data.append(rows[0])
            grandtotal += rows[0]['total']
    print(data)
    return render_template("index.html", bigdata=data, balance=balance, grandtotal=grandtotal)


@app.route("/buy", methods=["GET", "POST"])
@login_required
def buy():
    """Buy shares of stock"""

    if request.method == "POST":
        symbol = request.form.get("symbol")
        try:
            shares = int(request.form.get("shares"))
        except ValueError:
            return apology("you can only supply an integer", 400)
        if not symbol:
            return apology("must provide symbol", 400)
        quote = lookup(symbol)
        if not quote:
            return apology("Enter a valid symbol plix", 400)
        if not shares:
            return apology("must provide shares", 400)
        if shares < 1:
            return apology("shares should be a positive integer", 400)
        price = shares * quote["price"]
        rows = db.execute("SELECT cash FROM users WHERE id = :id", id=session["user_id"])
        cash = rows[0]['cash']

        if cash < price:
            return apology("Sorry ... You can't afford this", 400)

        balance = cash - price
        symbol = quote['symbol']
        db.execute("INSERT INTO tranzact (user_id, symbol, shares, price) VALUES (:user, :symbol, :shares, :price)",
                   user=session["user_id"], symbol=symbol, shares=shares, price=quote["price"])

        db.execute("UPDATE users SET cash=:balance WHERE id=:id", balance=balance, id=session["user_id"])

        # Redirect user to home page
        return redirect("/")
    else:
        return render_template("buy.html")


@app.route("/check", methods=["GET"])
def check():
    """Return true if username available, else false, in JSON format"""
    username = request.args.get("username")
    print(username)
    # Query database for username
    rows = db.execute("SELECT * FROM users WHERE username = :username",
                      username=username)
    print(rows)
    # Ensure username exists and password is correct
    if len(rows) >= 1:
        return jsonify(False)
    else:
        return jsonify(True)


@app.route("/history")
@login_required
def history():
    """Show history of transactions"""

    rows = db.execute("SELECT symbol, shares, price, time FROM tranzact WHERE user_id=:id ORDER BY time DESC",
                      id=session["user_id"])
    print(rows)
    return render_template("history.html", bigdata=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":
        username = request.form.get("username").strip()
        password = request.form.get("password")
        # Ensure username was submitted
        if not username:
            return apology("must provide username", 403)

        # Ensure password was submitted
        elif not password:
            return apology("must provide password", 403)

        username = request.form.get("username")

        # Query database for username
        rows = db.execute("SELECT * FROM users WHERE username = :username",
                          username=username)

        # Ensure username exists and password is correct
        if len(rows) != 1 or not check_password_hash(rows[0]["hash"], password):
            return apology("invalid username and/or password", 403)
        print
        # Remember which user has logged in
        session["user_id"] = rows[0]["id"]

        # 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 == "POST":
        symbol = request.form.get("symbol")
        if not symbol:
            return apology("must provide symbol", 400)
        quote = lookup(symbol)
        if not quote:
            return apology("Enter a valid symbol plix", 400)
        return render_template("quoted.html", quote=quote)

    else:
        return render_template("quote.html")


@app.route("/register", methods=["GET", "POST"])
def register():
    """Register user"""

    # Forget any user_id
    session.clear()

    # User reached route via POST (as by submitting a form via POST)
    if request.method == "POST":
        username = request.form.get("username").strip()
        password = request.form.get("password")
        confirmation = request.form.get("confirmation")
        # Ensure username was submitted
        if not username:
            return apology("must provide username", 400)

        # Ensure password was submitted
        elif not password:
            return apology("must provide password", 400)

        if password != confirmation:
            return apology("passwords must match", 400)

        else:
            rows = db.execute("SELECT * FROM users WHERE username = :username",
                              username=username)

            # Ensure username exists and password is correct
            if len(rows) >= 1:
                return apology("User already exists", 400)

            hash = generate_password_hash(password, method='pbkdf2:sha256', salt_length=8)
            db.execute("INSERT INTO users (username, hash) VALUES (:username, :hash)",
                       username=username, hash=hash)

        # Query database for username
        rows = db.execute("SELECT * FROM users WHERE username = :username",
                          username=username)

        # Remember which user has logged in
        session["user_id"] = rows[0]["id"]
        # Redirect user to home page
        return redirect("/")

    # User reached route via GET (as by clicking a link or via redirect)
    else:
        return render_template("register.html")


@app.route("/sell", methods=["GET", "POST"])
@login_required
def sell():
    """Sell shares of stock"""

    if request.method == "POST":
        symbol = request.form.get("symbol")
        shares = int(request.form.get("shares"))
        if not symbol:
            return apology("must provide symbol", 400)
        quote = lookup(symbol)

        if not quote:
            return apology("Enter a valid symbol plix", 400)
        if not shares:
            return apology("must provide shares", 400)
        if shares < 1:
            return apology("shares should be a positive integer", 400)
        symbol = quote['symbol']
        rows = db.execute("SELECT SUM(shares) FROM tranzact WHERE user_id = :id AND symbol = :symbol",
                          id=session["user_id"], symbol=symbol)

        stock = rows[0]['SUM(shares)']
        if not stock:
            return apology(f"Sorry ... You don't have any shares with {quote['name']}", 400)

        if stock < shares:
            return apology(f"Sorry ... You don't have enough {quote['name']} shares to sell", 400)

        price = shares * quote['price']
        shares = -shares

        db.execute("INSERT INTO tranzact (user_id, symbol, shares, price) VALUES (:user, :symbol, :shares, :price)",
                   user=session["user_id"], symbol=symbol, shares=shares, price=quote["price"])

        rows = db.execute("SELECT cash FROM users WHERE id = :id", id=session["user_id"])
        cash = rows[0]['cash']
        balance = cash + price
        db.execute("UPDATE users SET cash=:balance WHERE id=:id", balance=balance, id=session["user_id"])

        # Redirect user to home page
        return redirect("/")
    else:
        rows = db.execute("SELECT symbol FROM tranzact WHERE user_id=:id", id=session["user_id"])
        symbols = []
        for row in rows:
            symbols.append(row['symbol'])
        symbols = list(set(symbols))
        data = []
        for symbol in symbols:
            rows = db.execute("SELECT symbol, SUM(shares) FROM tranzact WHERE user_id=:id AND symbol=:symbol",
                            id=session["user_id"], symbol=symbol)
            if rows[0]['SUM(shares)'] > 0:
                data.append(rows[0]['symbol'])
        print(data)
        return render_template("sell.html", data=data)


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)