add pset7

pset7/README.md

@@ -0,0 +1 @@
+https://docs.cs50.net/2018/x/psets/7/pset7.html

pset7/finance/README.md

@@ -0,0 +1 @@
+https://docs.cs50.net/2018/x/psets/7/finance/finance.html

pset7/finance/application.py

@@ -0,0 +1,139 @@
+import os
+
+from cs50 import SQL
+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
+from werkzeug.security import check_password_hash, generate_password_hash
+
+from helpers import apology, login_required, lookup, usd
+
+# Ensure environment variable is set
+if not os.environ.get("API_KEY"):
+    raise RuntimeError("API_KEY not set")
+
+# 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")
+
+
+@app.route("/")
+@login_required
+def index():
+    """Show portfolio of stocks"""
+    return apology("TODO")
+
+
+@app.route("/buy", methods=["GET", "POST"])
+@login_required
+def buy():
+    """Buy shares of stock"""
+    return apology("TODO")
+
+
+@app.route("/history")
+@login_required
+def history():
+    """Show history of transactions"""
+    return apology("TODO")
+
+
+@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
+        rows = db.execute("SELECT * FROM users WHERE username = :username",
+                          username=request.form.get("username"))
+
+        # 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"]
+
+        # 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."""
+    return apology("TODO")
+
+
+@app.route("/register", methods=["GET", "POST"])
+def register():
+    """Register user"""
+    return apology("TODO")
+
+
+@app.route("/sell", methods=["GET", "POST"])
+@login_required
+def sell():
+    """Sell shares of stock"""
+    return apology("TODO")
+
+
+def errorhandler(e):
+    """Handle error"""
+    return apology(e.name, e.code)
+
+
+# listen for errors
+for code in default_exceptions:
+    app.errorhandler(code)(errorhandler)

pset7/finance/helpers.py

@@ -0,0 +1,84 @@
+import csv
+import os
+import urllib.request
+
+from flask import redirect, render_template, request, session
+from functools import wraps
+
+
+def apology(message, code=400):
+    """Render message as an apology to user."""
+    def escape(s):
+        """
+        Escape special characters.
+
+        https://github.com/jacebrowning/memegen#special-characters
+        """
+        for old, new in [("-", "--"), (" ", "-"), ("_", "__"), ("?", "~q"),
+                         ("%", "~p"), ("#", "~h"), ("/", "~s"), ("\"", "''")]:
+            s = s.replace(old, new)
+        return s
+    return render_template("apology.html", top=code, bottom=escape(message)), code
+
+
+def login_required(f):
+    """
+    Decorate routes to require login.
+
+    http://flask.pocoo.org/docs/0.12/patterns/viewdecorators/
+    """
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        if session.get("user_id") is None:
+            return redirect("/login")
+        return f(*args, **kwargs)
+    return decorated_function
+
+
+def lookup(symbol):
+    """Look up quote for symbol."""
+
+    # Reject symbol if it starts with caret
+    if symbol.startswith("^"):
+        return None
+
+    # Reject symbol if it contains comma
+    if "," in symbol:
+        return None
+
+    # Query Alpha Vantage for quote
+    # https://www.alphavantage.co/documentation/
+    try:
+
+        # GET CSV
+        url = f"https://www.alphavantage.co/query?apikey={os.getenv('API_KEY')}&datatype=csv&function=TIME_SERIES_INTRADAY&interval=1min&symbol={symbol}"
+        webpage = urllib.request.urlopen(url)
+
+        # Parse CSV
+        datareader = csv.reader(webpage.read().decode("utf-8").splitlines())
+
+        # Ignore first row
+        next(datareader)
+
+        # Parse second row
+        row = next(datareader)
+
+        # Ensure stock exists
+        try:
+            price = float(row[4])
+        except:
+            return None
+
+        # Return stock's name (as a str), price (as a float), and (uppercased) symbol (as a str)
+        return {
+            "price": price,
+            "symbol": symbol.upper()
+        }
+
+    except:
+        return None
+
+
+def usd(value):
+    """Format value as USD."""
+    return f"${value:,.2f}"

pset7/finance/requirements.txt

@@ -0,0 +1,3 @@
+cs50
+Flask
+Flask-Session

pset7/finance/static/styles.css

@@ -0,0 +1,47 @@
+nav .navbar-brand
+{
+    /* size for brand */
+    font-size: xx-large;
+}
+
+/* colors for brand */
+nav .navbar-brand .blue
+{
+    color: #537fbe;
+}
+nav .navbar-brand .red
+{
+    color: #ea433b;
+}
+nav .navbar-brand .yellow
+{
+    color: #f5b82e;
+}
+nav .navbar-brand .green
+{
+    color: #2e944b;
+}
+
+main .form-control
+{
+    /* center form controls */
+    display: inline-block;
+
+    /* override Bootstrap's 100% width for form controls */
+    width: auto;
+}
+
+main
+{
+    /* scroll horizontally as needed */
+    overflow-x: auto;
+
+    /* center contents */
+    text-align: center;
+}
+
+main img
+{
+    /* constrain images on small screens */
+    max-width: 100%;
+}

pset7/finance/templates/apology.html

@@ -0,0 +1,9 @@
+{% extends "layout.html" %}
+
+{% block title %}
+    Apology
+{% endblock %}
+
+{% block main %}
+    <img alt="{{ top }}" class="border" src="http://memegen.link/custom/{{ top | urlencode }}/{{ bottom | urlencode }}.jpg?alt=https://i.imgur.com/CsCgN7Ll.png"/>
+{% endblock %}

pset7/finance/templates/layout.html

@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+
+<html lang="en">
+
+    <head>
+
+        <!-- Required meta tags -->
+        <meta charset="utf-8"/>
+        <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"/>
+
+        <!-- documentation at http://getbootstrap.com/docs/4.0/, alternative themes at https://bootswatch.com/4-alpha/ -->
+        <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" rel="stylesheet"/>
+
+        <link href="/static/styles.css" rel="stylesheet"/>
+
+        <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js"></script>
+        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
+
+        <title>C$50 Finance: {% block title %}{% endblock %}</title>
+
+    </head>
+
+    <body>
+
+        <nav class="navbar navbar-expand-md navbar-light bg-light border">
+            <a class="navbar-brand" href="/"><span class="blue">C</span><span class="red">$</span><span class="yellow">5</span><span class="green">0</span> <span class="red">Finance</span></a>
+            <button aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation" class="navbar-toggler" data-target="#navbar" data-toggle="collapse" type="button">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+            <div class="collapse navbar-collapse" id="navbar">
+                {% if session.user_id %}
+                    <ul class="navbar-nav mr-auto mt-2">
+                        <li class="nav-item"><a class="nav-link" href="/quote">Quote</a></li>
+                        <li class="nav-item"><a class="nav-link" href="/buy">Buy</a></li>
+                        <li class="nav-item"><a class="nav-link" href="/sell">Sell</a></li>
+                        <li class="nav-item"><a class="nav-link" href="/history">History</a></li>
+                    </ul>
+                    <ul class="navbar-nav ml-auto mt-2">
+                        <li class="nav-item"><a class="nav-link" href="/logout">Log Out</a></li>
+                    </ul>
+                {% else %}
+                    <ul class="navbar-nav ml-auto mt-2">
+                        <li class="nav-item"><a class="nav-link" href="/register">Register</a></li>
+                        <li class="nav-item"><a class="nav-link" href="/login">Log In</a></li>
+                    </ul>
+                {% endif %}
+            </div>
+        </nav>
+
+        {% if get_flashed_messages() %}
+            <header>
+                <div class="alert alert-primary border text-center" role="alert">
+                    {{ get_flashed_messages() | join(" ") }}
+                </div>
+            </header>
+        {% endif %}
+
+        <main class="container p-5">
+            {% block main %}{% endblock %}
+        </main>
+
+    </body>
+
+</html>

pset7/finance/templates/login.html

@@ -0,0 +1,17 @@
+{% extends "layout.html" %}
+
+{% block title %}
+    Log In
+{% endblock %}
+
+{% block main %}
+    <form action="/login" method="post">
+        <div class="form-group">
+            <input autocomplete="off" autofocus class="form-control" name="username" placeholder="Username" type="text"/>
+        </div>
+        <div class="form-group">
+            <input class="form-control" name="password" placeholder="Password" type="password"/>
+        </div>
+        <button class="btn btn-primary" type="submit">Log In</button>
+    </form>
+{% endblock %}