added the ability to log in

app.py

@@ -29,12 +29,40 @@ def after_request(response):
     return response
 
 @app.route("/")
-def home():
+def index():
     return render_template("index.html")
 
-@app.route("/login")
+@app.route("/login", methods=["GET", "POST"])
 def login():
-    return render_template("login.html")
+
+    session.clear()
+
+    if request.method == "POST":
+
+        if not request.form.get("username"):
+            return apology("must provide username", 400)
+
+        elif not request.form.get("password"):
+            return apology("must provide password", 400)
+
+        rows = db.execute(
+            "SELECT * FROM users WHERE username = ?", (request.form.get("username"),)
+        )
+        conn.commit()
+
+        data = rows.fetchall()
+
+        if len(data) != 1 or not check_password_hash(
+            data[0][2], request.form.get("password")
+        ):
+            return apology("Invalid username and/or password", 400)
+
+        #session["user_id"] = rows[0]["id"]
+
+        return redirect("/")
+
+    elif request.method == "GET":
+        return render_template("login.html")
 
 @app.route("/register", methods=["GET", "POST"])
 def register():

templates/login.html

@@ -7,12 +7,12 @@
 {% block main %}
     <form action="/login" method="post">
         <div class="py-1 text-center">
-            <label for="exampleInputEmail1">Email address</label>
-            <input type="email" class="form-control mx-auto w-auto" id="username" aria-describedby="emailHelp">
+            <label for="username">Username</label>
+            <input type="text" class="form-control mx-auto w-auto" name="username" aria-describedby="emailHelp">
         </div>
         <div class="py-1 text-center">
-            <label for="exampleInputPassword1">Password</label>
-            <input type="password" class="form-control mx-auto w-auto" id="password">
+            <label for="password">Password</label>
+            <input type="password" class="form-control mx-auto w-auto" name="password">
         </div>
         <div class="py-3 text-center">
             <button type="submit" class="btn btn-primary">Submit</button>