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routes.py

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+import re
+
+from flask import render_template, redirect, url_for, flash, request
+from flask_login import login_user, logout_user, login_required, current_user
+from sqlalchemy.exc import IntegrityError
+
+
+from extensions import db
+from models import User
+from . import bp
+
+@bp.get("/register")
+def register_form():
+    if current_user.is_authenticated: 
+        return redirect(url_for("playlist.home"))
+    return render_template("auth/register.html")
+
+
+@bp.post("/register")
+def register():
+    username = request.form.get("username", "").strip()
+    email = request.form.get("email", "").strip().lower()
+    password = request.form.get("password", "").strip()
+    confirm = request.form.get("confirm", "").strip()
+
+    if not all([username,email,password, confirm]):
+        flash("Fill in every field!", "error")
+        return redirect(url_for("auth.register_form"))
+    
+    email_regex = r"^[\w\.-]+@[\w\.-]+\.\w+$"
+    if not re.match(email_regex, email):
+        flash("invalid email address!", "error")
+        return redirect(url_for("auth.register"))
+    
+    if password != confirm:
+        flash("invalid password", "error")
+        return redirect(url_for("auth.register_form"))
+    
+    if not re.search(r"[A-Z]", password):
+        flash("invalid password", "error")
+        return redirect(url_for("auth.register"))
+    
+    if not re.search(r"[a-z]", password):
+        flash("invalid password", "error")
+        return redirect(url_for("register"))
+    
+    if not re.search(r"\d", password):
+        flash("invalid password", "error")
+        return redirect(url_for("auth.register"))
+    
+    exiting_user = User.query.filter_by(email=email).first()
+
+    if exiting_user:
+        flash("User already exits!", "error")
+        return redirect(url_for("auth.register"))
+
+    user = User(username=username, email=email)
+
+    try: 
+        user.set_password(password)
+    except  ValueError as e:
+        flash(str(e), "error")
+        return redirect(url_for("auth.register_form"))
+    
+    try: 
+        db.session.add(user)
+        db.session.commit()
+    except IntegrityError:
+        db.session.rollback()
+        flash("Username or email already registerd", "error")
+        return redirect(url_for("auth.register_form"))
+    
+    flash("Account has been created!", "success")
+    return redirect(url_for("auth.login_form"))
+
+
+@bp.get("/login")
+def login_form():
+    if current_user.is_authenticated:
+        return redirect(url_for("playlist.home"))
+    return render_template("auth/login.html")
+
+
+@bp.post("/login")
+def login():
+    email = request.form.get("email", "").strip().lower()
+    password = request.form.get("password", "")
+
+    user = User.query.filter_by(email=email).first()
+
+    if not user or not user.check_password(password):
+        flash("wrong email or password", "error")
+        return redirect(url_for("auth.login_form"))
+    
+    login_user(user)
+
+    next_page = request.args.get("next")
+    return redirect(next_page or url_for("playlist.home"))
+
+
+@bp.get("/logout")
+def logout():
+    logout_user()
+    flash("You are now logged out!", "error")
+    return redirect(url_for("auth.login_form"))