Remove PyPi build, convert project to not be a python module, add Docker build and files, update README,

app.py

@@ -0,0 +1,114 @@
+from flask import Flask, Response, render_template, redirect, url_for, g, request
+
+from flask_login import LoginManager, login_required
+
+from pattern import Pattern
+
+import sqlite3, os, flask_login, dotenv, secrets
+
+if os.path.exists(".env"):
+    dotenv.load_dotenv(".env")
+else:
+    print(".env file not found. Continuing with Docker environment or default values.")
+
+login_manager = LoginManager()
+app = Flask(__name__)
+app.secret_key = os.getenv("APP_KEY", secrets.token_urlsafe(64))
+
+login_manager.init_app(app)
+
+def get_db():
+    db = getattr(g, '_database', None)
+
+    if db is None:
+        db = g._database = sqlite3.connect(os.environ.get("DB_FILE", "data.db"))
+        db.execute("""
+            CREATE TABLE IF NOT EXISTS Users (
+                username TEXT PRIMARY KEY,
+                pattern TEXT UNIQUE
+            )
+        """)
+
+    return db
+
+@app.teardown_appcontext
+def close_connection(exception):
+    db = getattr(g, '_database', None)
+    if db is not None:
+        db.close()
+
+class User(flask_login.UserMixin):
+    pass
+
+@login_manager.user_loader
+def user_loader(user_id):
+    user = User()
+    user.id = user_id
+    return user
+
+@login_manager.unauthorized_handler
+def unathorized_handler():
+    return redirect(url_for("login"))
+
+@app.route("/")
+@login_required
+def main():
+    return render_template("index.jinja2")
+
+@app.route("/login", methods=["GET", "POST"])
+def login():
+    if request.method == "GET":
+        if flask_login.current_user.is_authenticated:
+            return redirect(url_for("main"))
+
+        return render_template("login.jinja2", grid_size=os.getenv("GRID_SIZE", 25))
+    
+    elif request.method == "POST":
+        username = request.form["username"]
+        pattern = Pattern.from_str(request.form["pattern"])
+
+        cur = get_db().cursor()
+
+        cur.execute("SELECT pattern from Users WHERE username = ?", (username, ))
+
+        required_pattern = cur.fetchone()
+        if not required_pattern:
+            cur.close()
+            return Response("An account with this username doesn't exist.", 400)
+
+        if pattern == Pattern.from_json_str(required_pattern[0]):
+            cur.close()
+
+            user = User()
+            user.id = username
+            flask_login.login_user(user, remember=True)
+
+            return redirect(url_for("main"))
+
+@app.route("/register", methods=["GET", "POST"])
+def register():
+    if request.method == "GET":
+        if flask_login.current_user.is_authenticated:
+            return redirect(url_for("main"))
+        
+        return render_template("register.jinja2", grid_size=os.getenv("GRID_SIZE", 25))
+    
+    elif request.method == "POST":
+        username = request.form["username"]
+        pattern = Pattern.from_str(request.form["pattern"])
+
+        cur = get_db().cursor()
+
+        cur.execute("SELECT username from Users WHERE username = ?", (username, ))
+
+        if cur.fetchone():
+            cur.close()
+            return Response("An account with this username already exists.", 400)
+
+        cur.execute("INSERT INTO Users (username, pattern) VALUES (?, ?)", (username, pattern.to_json_str()))
+        get_db().commit()
+        cur.close()
+
+        return redirect(url_for("login"))
+
+app.run(host=os.getenv("HOST", "0.0.0.0"), port=os.getenv("PORT", 8080), debug=os.getenv("DEBUG_MODE", False))