Repository: vuyp/bluenest
Pull request #2: feat: Initial setup for BlueNest social media platform
Author: login: vuyp
Labels: name: hoji:reviewed
Created: 2025-05-20T17:54:20Z | Merged: 2025-05-20T17:54:28Z

This commit includes the foundational structure and core features for the BlueNest application.

Key components established:
- Basic project structure (frontend, backend, database directories).
- Conceptual database schema (users, posts, comments).
- Backend API (Flask) with in-memory data storage for:
    - User registration (/register)
    - User login (/login)
    - Post creation and retrieval (/posts GET, POST)
- Frontend UI (HTML, CSS, JS) for:
    - Registration page
    - Login page
    - Main feed page for viewing and creating posts
- Core feature integration between frontend and backend.
- Initial UI/UX refinements for a cleaner look and feel.
- Backend unit tests (pytest) for API endpoints.

The frontend is served by a simple Python HTTP server, and the backend uses Flask's development server. CORS support has been added to the backend.


Diff:
diff --git a/backend/__pycache__/app.cpython-310.pyc b/backend/__pycache__/app.cpython-310.pyc
new file mode 100644
index 0000000..4ba32d3
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diff --git a/backend/app.py b/backend/app.py
new file mode 100644
index 0000000..3d398e2
--- /dev/null
+++ b/backend/app.py
@@ -0,0 +1,89 @@
+from flask import Flask, request, jsonify
+from flask_bcrypt import Bcrypt
+from flask_cors import CORS
+
+app = Flask(__name__)
+CORS(app) # Enable CORS for all routes
+bcrypt = Bcrypt(app)
+
+# In-memory data stores
+users = []
+posts = []
+user_id_counter = 1
+post_id_counter = 1
+
+@app.route('/register', methods=['POST'])
+def register():
+    global user_id_counter
+    data = request.get_json()
+    username = data.get('username')
+    email = data.get('email')
+    password = data.get('password')
+
+    if not username or not email or not password:
+        return jsonify({'error': 'Missing username, email, or password'}), 400
+
+    # Check for uniqueness
+    if any(user['username'] == username for user in users):
+        return jsonify({'error': 'Username already exists'}), 409
+    if any(user['email'] == email for user in users):
+        return jsonify({'error': 'Email already exists'}), 409
+
+    hashed_password = bcrypt.generate_password_hash(password).decode('utf-8')
+    
+    new_user = {
+        'user_id': user_id_counter,
+        'username': username,
+        'email': email,
+        'password_hash': hashed_password
+    }
+    users.append(new_user)
+    user_id_counter += 1
+    return jsonify({'message': 'User registered successfully', 'user': new_user}), 201
+
+@app.route('/login', methods=['POST'])
+def login():
+    data = request.get_json()
+    email = data.get('email')
+    password = data.get('password')
+
+    if not email or not password:
+        return jsonify({'error': 'Missing email or password'}), 400
+
+    user = next((user for user in users if user['email'] == email), None)
+
+    if user and bcrypt.check_password_hash(user['password_hash'], password):
+        # In a real app, return a token (e.g., JWT)
+        return jsonify({'message': 'Login successful', 'user_id': user['user_id']}), 200
+    else:
+        return jsonify({'error': 'Invalid email or password'}), 401
+
+@app.route('/posts', methods=['POST'])
+def create_post():
+    global post_id_counter
+    data = request.get_json()
+    user_id = data.get('user_id') 
+    content = data.get('content')
+
+    if not user_id or not content:
+        return jsonify({'error': 'Missing user_id or content'}), 400
+
+    # Check if user exists (optional, but good practice)
+    if not any(user['user_id'] == user_id for user in users):
+        return jsonify({'error': 'User not found'}), 404
+        
+    new_post = {
+        'post_id': post_id_counter,
+        'user_id': user_id,
+        'content': content
+    }
+    posts.append(new_post)
+    post_id_counter += 1
+    return jsonify({'message': 'Post created successfully', 'post': new_post}), 201
+
+@app.route('/posts', methods=['GET'])
+def get_posts():
+    return jsonify(posts), 200
+
+if __name__ == '__main__':
+    app.run(debug=True)
diff --git a/backend/requirements.txt b/backend/requirements.txt
new file mode 100644
index 0000000..75a6ccd
--- /dev/null
+++ b/backend/requirements.txt
@@ -0,0 +1,4 @@
+Flask
+Flask-Bcrypt
+Flask-CORS
+pytest
diff --git a/backend/run.sh b/backend/run.sh
new file mode 100755
index 0000000..b39b4e7
--- /dev/null
+++ b/backend/run.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+export FLASK_APP=app.py
+flask run
diff --git a/backend/tests/__pycache__/test_app.cpython-310-pytest-8.3.5.pyc b/backend/tests/__pycache__/test_app.cpython-310-pytest-8.3.5.pyc
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index 0000000..2f30ead
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diff --git a/backend/tests/test_app.py b/backend/tests/test_app.py
new file mode 100644
index 0000000..a871a2f
--- /dev/null
+++ b/backend/tests/test_app.py
@@ -0,0 +1,211 @@
+import pytest
+import json
+
+# Assuming tests are run from the 'backend' directory (e.g., `cd backend; python -m pytest`)
+# So, 'app.py' is in the current path.
+from app import app as flask_app  # This is the Flask instance: app = Flask(__name__)
+from app import users, posts      # These are the global lists: users = [], posts = []
+import app as app_module          # This is the module app.py itself, to reset global counters
+
+@pytest.fixture
+def client():
+    flask_app.config['TESTING'] = True
+    
+    # Reset global in-memory stores and counters from app_module before each test
+    users.clear()  # Direct modification of imported list 'users'
+    posts.clear()  # Direct modification of imported list 'posts'
+    
+    # Counters are global variables in app.py. To reset them, we need to modify them in their module.
+    app_module.user_id_counter = 1
+    app_module.post_id_counter = 1
+    
+    with flask_app.test_client() as current_client:
+        yield current_client
+    
+    # Optional: Cleanup after tests. Resetting at the start of the fixture is typical for pytest.
+    # users.clear()
+    # posts.clear()
+    # app_module.user_id_counter = 1
+    # app_module.post_id_counter = 1
+
+# --- Test User Registration ---
+def test_register_success(client):
+    """Test successful user registration."""
+    response = client.post('/register', json={
+        'username': 'testuser',
+        'email': 'test@example.com',
+        'password': 'password123'
+    })
+    data = response.get_json()
+    assert response.status_code == 201
+    assert data['message'] == 'User registered successfully'
+    assert data['user']['username'] == 'testuser'
+    assert data['user']['email'] == 'test@example.com'
+    assert 'user_id' in data['user']
+    assert data['user']['user_id'] == 1 # First user
+    assert len(users) == 1
+    assert users[0]['username'] == 'testuser'
+    assert users[0]['user_id'] == 1
+    assert app_module.user_id_counter == 2 # Counter should have incremented
+
+def test_register_missing_data(client):
+    """Test registration with missing email."""
+    response = client.post('/register', json={
+        'username': 'testuser2',
+        'password': 'password123'
+        # Email is missing
+    })
+    data = response.get_json()
+    assert response.status_code == 400
+    assert 'error' in data
+    assert data['error'] == 'Missing username, email, or password'
+    assert len(users) == 0
+    assert app_module.user_id_counter == 1 # Counter should not have incremented
+
+def test_register_duplicate_username(client):
+    """Test registration with a duplicate username."""
+    client.post('/register', json={'username': 'testuser', 'email': 'test1@example.com', 'password': 'password123'})
+    
+    response = client.post('/register', json={
+        'username': 'testuser', # Duplicate username
+        'email': 'test2@example.com',
+        'password': 'password123'
+    })
+    data = response.get_json()
+    assert response.status_code == 409
+    assert data['error'] == 'Username already exists'
+    assert len(users) == 1 # Only the first user should be registered
+    assert app_module.user_id_counter == 2 # Counter incremented for the first user only
+
+def test_register_duplicate_email(client):
+    """Test registration with a duplicate email."""
+    client.post('/register', json={'username': 'testuser1', 'email': 'test@example.com', 'password': 'password123'})
+    
+    response = client.post('/register', json={
+        'username': 'testuser2',
+        'email': 'test@example.com', # Duplicate email
+        'password': 'password123'
+    })
+    data = response.get_json()
+    assert response.status_code == 409
+    assert data['error'] == 'Email already exists'
+    assert len(users) == 1
+    assert app_module.user_id_counter == 2
+
+# --- Test User Login ---
+def test_login_success(client):
+    """Test successful user login."""
+    reg_response = client.post('/register', json={'username': 'loginuser', 'email': 'login@example.com', 'password': 'password123'})
+    assert reg_response.status_code == 201
+    registered_user_id = reg_response.get_json()['user']['user_id']
+    
+    response = client.post('/login', json={
+        'email': 'login@example.com',
+        'password': 'password123'
+    })
+    data = response.get_json()
+    assert response.status_code == 200
+    assert data['message'] == 'Login successful'
+    assert 'user_id' in data
+    assert data['user_id'] == registered_user_id
+
+def test_login_incorrect_password(client):
+    """Test login with an incorrect password."""
+    client.post('/register', json={'username': 'loginuser', 'email': 'login@example.com', 'password': 'password123'})
+    
+    response = client.post('/login', json={
+        'email': 'login@example.com',
+        'password': 'wrongpassword'
+    })
+    data = response.get_json()
+    assert response.status_code == 401
+    assert data['error'] == 'Invalid email or password'
+
+def test_login_non_existent_user(client):
+    """Test login with a non-existent email."""
+    response = client.post('/login', json={
+        'email': 'nouser@example.com',
+        'password': 'password123'
+    })
+    data = response.get_json()
+    assert response.status_code == 401 
+    assert data['error'] == 'Invalid email or password'
+
+# --- Test Posts ---
+def test_create_post_success(client):
+    """Test creating a post successfully."""
+    reg_response = client.post('/register', json={'username': 'postuser', 'email': 'postuser@example.com', 'password': 'password'})
+    user_id = reg_response.get_json()['user']['user_id']
+
+    response = client.post('/posts', json={
+        'user_id': user_id,
+        'content': 'This is a test post.'
+    })
+    data = response.get_json()
+    assert response.status_code == 201
+    assert data['message'] == 'Post created successfully'
+    assert data['post']['content'] == 'This is a test post.'
+    assert data['post']['user_id'] == user_id
+    assert data['post']['post_id'] == 1 # First post
+    assert len(posts) == 1
+    assert posts[0]['content'] == 'This is a test post.'
+    assert posts[0]['post_id'] == 1
+    assert app_module.post_id_counter == 2 # Counter should have incremented
+
+def test_create_post_missing_data(client):
+    """Test creating a post with missing content or user_id."""
+    reg_response = client.post('/register', json={'username': 'postuser', 'email': 'postuser@example.com', 'password': 'password'})
+    user_id = reg_response.get_json()['user']['user_id']
+    
+    # Missing content
+    response_no_content = client.post('/posts', json={'user_id': user_id})
+    data_no_content = response_no_content.get_json()
+    assert response_no_content.status_code == 400
+    assert data_no_content['error'] == 'Missing user_id or content'
+    
+    # Missing user_id
+    response_no_user = client.post('/posts', json={'content': 'A post without a user'})
+    data_no_user = response_no_user.get_json()
+    assert response_no_user.status_code == 400
+    assert data_no_user['error'] == 'Missing user_id or content'
+    
+    assert len(posts) == 0
+    assert app_module.post_id_counter == 1 # Counter should not increment
+
+def test_create_post_user_not_found(client):
+    """Test creating a post for a non-existent user."""
+    response = client.post('/posts', json={
+        'user_id': 999, # Assuming user_id 999 does not exist
+        'content': 'This post should fail.'
+    })
+    data = response.get_json()
+    assert response.status_code == 404 
+    assert data['error'] == 'User not found'
+    assert len(posts) == 0
+    assert app_module.post_id_counter == 1
+
+def test_get_posts_empty(client):
+    """Test fetching posts when there are none."""
+    response = client.get('/posts')
+    data = response.get_json()
+    assert response.status_code == 200
+    assert isinstance(data, list)
+    assert len(data) == 0
+
+def test_get_posts_with_content(client):
+    """Test fetching posts when some exist."""
+    reg_response = client.post('/register', json={'username': 'postuser', 'email': 'postuser@example.com', 'password': 'password'})
+    user_id = reg_response.get_json()['user']['user_id']
+    
+    client.post('/posts', json={'user_id': user_id, 'content': 'First post!'})
+    client.post('/posts', json={'user_id': user_id, 'content': 'Second post!'})
+
+    response = client.get('/posts')
+    data = response.get_json()
+    assert response.status_code == 200
+    assert len(data) == 2
+    assert data[0]['content'] == 'First post!'
+    assert data[0]['post_id'] == 1
+    assert data[1]['content'] == 'Second post!'
+    assert data[1]['post_id'] == 2
+    assert app_module.post_id_counter == 3 # Incremented for each post
diff --git a/database/schema.md b/database/schema.md
new file mode 100644
index 0000000..261259c
--- /dev/null
+++ b/database/schema.md
@@ -0,0 +1,36 @@
+# BlueNest Database Schema
+
+## Users Table
+
+| Column              | Data Type                     | Constraints                               | Description                                   |
+|---------------------|-------------------------------|-------------------------------------------|-----------------------------------------------|
+| `user_id`           | Auto-incrementing Integer     | Primary Key                               | Unique identifier for the user.               |
+| `username`          | String                        | Unique                                    | User's chosen username.                       |
+| `email`             | String                        | Unique                                    | User's email address.                         |
+| `password_hash`     | String                        |                                           | Hashed password for security.                 |
+| `profile_picture_url` | String                        | Optional                                  | URL to the user's profile picture.            |
+| `bio`               | Text                          | Optional                                  | Short biography or description from the user. |
+| `created_at`        | Timestamp                     |                                           | Timestamp of when the user account was created. |
+
+## Posts Table
+
+| Column        | Data Type                     | Constraints                               | Description                                     |
+|---------------|-------------------------------|-------------------------------------------|-------------------------------------------------|
+| `post_id`     | Auto-incrementing Integer     | Primary Key                               | Unique identifier for the post.                 |
+| `user_id`     | Integer                       | Foreign Key (references Users.user_id)    | Identifier of the user who created the post.    |
+| `content`     | Text                          |                                           | Textual content of the post.                    |
+| `media_url`   | String                        | Optional                                  | URL to any media (image/video) attached to the post. |
+| `created_at`  | Timestamp                     |                                           | Timestamp of when the post was created.         |
+| `updated_at`  | Timestamp                     |                                           | Timestamp of when the post was last updated.    |
+
+## Comments Table
+
+| Column              | Data Type                     | Constraints                               | Description                                     |
+|---------------------|-------------------------------|-------------------------------------------|-------------------------------------------------|
+| `comment_id`        | Auto-incrementing Integer     | Primary Key                               | Unique identifier for the comment.              |
+| `post_id`           | Integer                       | Foreign Key (references Posts.post_id)    | Identifier of the post to which the comment belongs. |
+| `user_id`           | Integer                       | Foreign Key (references Users.user_id)    | Identifier of the user who wrote the comment.   |
+| `parent_comment_id` | Integer                       | Foreign Key (references Comments.comment_id), Optional | Identifier of the parent comment for threading. |
+| `content`           | Text                          |                                           | Textual content of the comment.                 |
+| `created_at`        | Timestamp                     |                                           | Timestamp of when the comment was created.      |
+| `updated_at`        | Timestamp                     |                                           | Timestamp of when the comment was last updated. |
diff --git a/frontend/run_frontend.sh b/frontend/run_frontend.sh
new file mode 100755
index 0000000..4974b0f
--- /dev/null
+++ b/frontend/run_frontend.sh
@@ -0,0 +1,2 @@
+#!/bin/bash
+python3 serve_frontend.py
diff --git a/frontend/serve_frontend.py b/frontend/serve_frontend.py
new file mode 100644
index 0000000..e465a38
--- /dev/null
+++ b/frontend/serve_frontend.py
@@ -0,0 +1,34 @@
+# frontend/serve_frontend.py
+import http.server
+import socketserver
+import os
+
+PORT = 8000
+WEB_DIR = os.path.dirname(os.path.abspath(__file__)) # Should serve from the 'frontend' directory
+
+class Handler(http.server.SimpleHTTPRequestHandler):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, directory=WEB_DIR, **kwargs)
+
+    def do_GET(self):
+        original_path = self.path
+        
+        if original_path == '/':
+            self.path = '/templates/index.html'
+        elif original_path == '/register':
+            self.path = '/templates/register.html'
+        elif original_path == '/login':
+            self.path = '/templates/login.html'
+        # For other paths like /static/css/style.css or /static/js/auth.js,
+        # SimpleHTTPRequestHandler will serve them directly from the WEB_DIR 
+        # (e.g., WEB_DIR/static/css/style.css)
+        # So, no specific handling is needed for them here, self.path remains as is.
+
+        # print(f"Serving request: Original='{original_path}', Mapped='{self.path}' relative to '{WEB_DIR}'")
+        return http.server.SimpleHTTPRequestHandler.do_GET(self)
+
+
+with socketserver.TCPServer(("", PORT), Handler) as httpd:
+    print(f"Serving frontend at http://localhost:{PORT}")
+    print(f"Web directory: {WEB_DIR}")
+    httpd.serve_forever()
diff --git a/frontend/static/css/style.css b/frontend/static/css/style.css
new file mode 100644
index 0000000..5b38ce4
--- /dev/null
+++ b/frontend/static/css/style.css
@@ -0,0 +1,244 @@
+@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');
+
+body {
+    font-family: 'Roboto', sans-serif;
+    margin: 0;
+    background-color: #eef1f5; /* Light blue-gray background */
+    color: #333;
+    line-height: 1.6;
+}
+
+.container {
+    width: 90%;
+    max-width: 1000px; /* Max width for larger screens */
+    margin: 20px auto;
+    overflow: hidden;
+    padding: 20px;
+    background-color: #fff;
+    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
+    border-radius: 8px;
+}
+
+/* Centering for auth pages */
+.auth-container {
+    width: 90%;
+    max-width: 450px; /* Narrower for auth forms */
+    margin: 50px auto;
+    padding: 30px;
+    background-color: #fff;
+    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
+    border-radius: 8px;
+    text-align: center;
+}
+
+h1, h2 {
+    color: #007bff; /* BlueNest primary blue */
+    margin-bottom: 20px;
+}
+
+h1 {
+    font-size: 2.2em;
+    text-align: center;
+}
+
+h2 {
+    font-size: 1.8em;
+}
+
+label {
+    display: block;
+    margin-top: 15px;
+    margin-bottom: 5px;
+    color: #555;
+    font-weight: 500;
+    text-align: left;
+}
+
+input[type="text"],
+input[type="email"],
+input[type="password"],
+textarea {
+    width: calc(100% - 24px); /* Full width minus padding */
+    padding: 12px;
+    margin-top: 5px;
+    border: 1px solid #ccc;
+    border-radius: 6px;
+    box-sizing: border-box;
+    font-size: 1em;
+    transition: border-color 0.3s ease;
+}
+
+input[type="text"]:focus,
+input[type="email"]:focus,
+input[type="password"]:focus,
+textarea:focus {
+    border-color: #007bff;
+    outline: none;
+    box-shadow: 0 0 0 2px rgba(0,123,255,.25);
+}
+
+textarea {
+    resize: vertical; /* Allow vertical resize */
+    min-height: 80px;
+}
+
+button {
+    background-color: #007bff;
+    color: white;
+    padding: 12px 20px;
+    border: none;
+    border-radius: 6px;
+    cursor: pointer;
+    margin-top: 25px;
+    font-size: 1.1em;
+    font-weight: 500;
+    transition: background-color 0.3s ease;
+    display: inline-block; /* To center if text-align: center is on parent */
+}
+
+button:hover {
+    background-color: #0056b3; /* Darker blue on hover */
+}
+
+button:disabled {
+    background-color: #a0a0a0;
+    cursor: not-allowed;
+}
+
+#message, #postMessage {
+    margin-top: 20px;
+    padding: 12px;
+    border-radius: 6px;
+    font-size: 0.95em;
+    text-align: center; /* Center message text */
+}
+
+#message.success, #postMessage.success {
+    background-color: #d4edda;
+    color: #155724;
+    border: 1px solid #c3e6cb;
+}
+
+#message.error, #postMessage.error {
+    background-color: #f8d7da;
+    color: #721c24;
+    border: 1px solid #f5c6cb;
+}
+
+p a {
+    color: #007bff;
+    text-decoration: none;
+}
+
+p a:hover {
+    text-decoration: underline;
+}
+
+.create-post {
+    margin-bottom: 40px;
+    padding: 20px;
+    background-color: #f9f9f9;
+    border-radius: 8px;
+    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
+}
+
+.posts-section {
+    margin-top: 30px;
+}
+
+.post {
+    background-color: #ffffff;
+    border: 1px solid #e0e0e0;
+    padding: 20px;
+    margin-bottom: 20px;
+    border-radius: 8px;
+    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
+    transition: box-shadow 0.3s ease, transform 0.2s ease; /* For hover effect */
+}
+
+.post:hover {
+    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
+    transform: translateY(-3px); /* Subtle lift effect */
+}
+
+.post h3 {
+    margin-top: 0;
+    margin-bottom: 10px;
+    color: #333;
+    font-size: 1.2em;
+    font-weight: 500;
+}
+
+.post p { /* Content of the post */
+    font-size: 1em;
+    color: #444;
+    margin-bottom: 10px;
+    white-space: pre-wrap; /* Preserve line breaks */
+}
+
+.post small { /* Post metadata */
+    font-size: 0.85em;
+    color: #777;
+    display: block; /* Ensure it takes its own line if needed */
+}
+
+/* Loading indicator styles */
+.loader {
+    border: 4px solid #f3f3f3; /* Light grey */
+    border-top: 4px solid #007bff; /* Blue */
+    border-radius: 50%;
+    width: 20px;
+    height: 20px;
+    animation: spin 1s linear infinite;
+    display: none; /* Hidden by default */
+    margin: 10px auto; /* Center it */
+}
+
+@keyframes spin {
+    0% { transform: rotate(0deg); }
+    100% { transform: rotate(360deg); }
+}
+
+/* Responsive Design */
+@media (max-width: 768px) {
+    .container, .auth-container {
+        width: 95%;
+        margin: 15px auto;
+        padding: 15px;
+    }
+
+    h1 {
+        font-size: 1.8em;
+    }
+
+    h2 {
+        font-size: 1.5em;
+    }
+
+    button {
+        width: 100%; /* Full width buttons on smaller screens */
+        padding: 12px 15px;
+    }
+
+    input[type="text"],
+    input[type="email"],
+    input[type="password"],
+    textarea {
+        font-size: 0.95em;
+    }
+}
+
+@media (max-width: 480px) {
+    body {
+        font-size: 15px; /* Slightly smaller base font for very small screens */
+    }
+    .container, .auth-container {
+        padding: 10px;
+    }
+    h1 {
+        font-size: 1.6em;
+    }
+    h2 {
+        font-size: 1.3em;
+    }
+}
diff --git a/frontend/static/js/app.js b/frontend/static/js/app.js
new file mode 100644
index 0000000..29ff007
--- /dev/null
+++ b/frontend/static/js/app.js
@@ -0,0 +1,117 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const createPostForm = document.getElementById('createPostForm');
+    const postMessageDiv = document.getElementById('postMessage');
+    const postsContainer = document.getElementById('postsContainer');
+    const createPostLoader = document.getElementById('createPostLoader');
+    const postsLoader = document.getElementById('postsLoader'); // Loader for the feed
+    const createPostButton = createPostForm ? createPostForm.querySelector('button[type="submit"]') : null;
+
+    const showCreatePostLoader = (show) => {
+        if (createPostLoader) createPostLoader.style.display = show ? 'block' : 'none';
+        if (createPostButton) createPostButton.disabled = show;
+    };
+
+    const showPostsLoader = (show) => {
+        if (postsLoader) postsLoader.style.display = show ? 'block' : 'none';
+    };
+
+    const displayPostMessage = (message, type) => {
+        if (postMessageDiv) {
+            postMessageDiv.textContent = message;
+            postMessageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    const fetchAndDisplayPosts = async () => {
+        if (!postsContainer) return;
+        showPostsLoader(true);
+        postsContainer.innerHTML = ''; // Clear previous posts before loading
+
+        try {
+            const response = await fetch('http://localhost:5000/posts');
+            if (!response.ok) {
+                postsContainer.innerHTML = '<p>Error loading posts. Could not connect to server.</p>';
+                console.error('Failed to fetch posts:', response.status);
+                return;
+            }
+            const posts = await response.json();
+            if (posts.length === 0) {
+                postsContainer.innerHTML = '<p>No posts yet. Be the first to create one!</p>';
+                return;
+            }
+            // postsContainer.innerHTML = ''; // Already cleared
+            posts.forEach(post => {
+                const postElement = document.createElement('div');
+                postElement.className = 'post';
+                // In a real app, user_id would be used to fetch username
+                postElement.innerHTML = `
+                    <h3>Post by User #${post.user_id}</h3>
+                    <p>${post.content.replace(/\n/g, '<br>')}</p> 
+                    <small>Post ID: ${post.post_id}</small>
+                `;
+                postsContainer.appendChild(postElement);
+            });
+        } catch (error) {
+            console.error('Error fetching posts:', error);
+            postsContainer.innerHTML = '<p>Error loading posts. Please try again later.</p>';
+        } finally {
+            showPostsLoader(false);
+        }
+    };
+
+    if (createPostForm) {
+        createPostForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayPostMessage('', ''); // Clear previous messages
+            showCreatePostLoader(true);
+            const content = document.getElementById('postContent').value;
+            
+            // Retrieve user info from localStorage
+            const userInfo = JSON.parse(localStorage.getItem('userInfo'));
+            let userId; 
+            if (userInfo && userInfo.userId) {
+                userId = userInfo.userId;
+            } else {
+                displayPostMessage('You must be logged in to post. Redirecting to login...', 'error');
+                showCreatePostLoader(false);
+                setTimeout(() => { window.location.href = '/login'; }, 2000);
+                return;
+            }
+
+            if (!content.trim()) {
+                displayPostMessage('Post content cannot be empty.', 'error');
+                showCreatePostLoader(false);
+                return;
+            }
+
+            try {
+                const response = await fetch('http://localhost:5000/posts', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify({ user_id: userId, content: content }),
+                });
+                const result = await response.json();
+                if (response.ok) {
+                    displayPostMessage('Post created successfully!', 'success');
+                    createPostForm.reset();
+                    fetchAndDisplayPosts(); // Refresh the posts list
+                } else {
+                    displayPostMessage(result.error || 'Failed to create post.', 'error');
+                }
+            } catch (error) {
+                console.error('Create post error:', error);
+                displayPostMessage('An error occurred while creating the post.', 'error');
+            } finally {
+                showCreatePostLoader(false);
+            }
+        });
+    }
+
+    // Initial fetch of posts when the page loads
+    // Ensure this runs only on pages with postsContainer (like index.html)
+    if (postsContainer) { 
+        fetchAndDisplayPosts();
+    }
+});
diff --git a/frontend/static/js/auth.js b/frontend/static/js/auth.js
new file mode 100644
index 0000000..d9a775d
--- /dev/null
+++ b/frontend/static/js/auth.js
@@ -0,0 +1,92 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const registerForm = document.getElementById('registerForm');
+    const loginForm = document.getElementById('loginForm');
+    const messageDiv = document.getElementById('message');
+    // General selector for loader, assuming one loader per auth page
+    const loader = document.querySelector('.loader'); 
+    const submitButton = document.querySelector('button[type="submit"]');
+
+    const showLoader = (show) => {
+        if (loader) loader.style.display = show ? 'block' : 'none';
+        if (submitButton) submitButton.disabled = show;
+    };
+
+    const displayMessage = (message, type) => {
+        if (messageDiv) {
+            messageDiv.textContent = message;
+            messageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    if (registerForm) {
+        registerForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayMessage('', ''); // Clear previous messages
+            showLoader(true);
+            const formData = new FormData(registerForm);
+            const data = Object.fromEntries(formData.entries());
+
+            try {
+                const response = await fetch('http://localhost:5000/register', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(data),
+                });
+                const result = await response.json();
+                if (response.ok) {
+                    displayMessage(`Registration successful! User ID: ${result.user.user_id}`, 'success');
+                    registerForm.reset();
+                    // Optionally redirect to login
+                    // window.location.href = '/login'; 
+                } else {
+                    displayMessage(result.error || 'Registration failed.', 'error');
+                }
+            } catch (error) {
+                console.error('Registration error:', error);
+                displayMessage('An error occurred during registration.', 'error');
+            } finally {
+                showLoader(false);
+            }
+        });
+    }
+
+    if (loginForm) {
+        loginForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayMessage('', ''); // Clear previous messages
+            showLoader(true);
+            const formData = new FormData(loginForm);
+            const data = Object.fromEntries(formData.entries());
+
+            try {
+                const response = await fetch('http://localhost:5000/login', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(data),
+                });
+                const result = await response.json();
+                if (response.ok) {
+                    // Message displayed by redirecting page or not at all
+                    localStorage.setItem('userInfo', JSON.stringify({ userId: result.user_id, email: data.email }));
+                    loginForm.reset();
+                    // Redirect to the main feed page
+                    window.location.href = '/'; 
+                    // No displayMessage here because of redirect
+                } else {
+                    displayMessage(result.error || 'Login failed.', 'error');
+                }
+            } catch (error) {
+                console.error('Login error:', error);
+                displayMessage('An error occurred during login.', 'error');
+            } finally {
+                // Hide loader only if not redirecting, but it's safer to always hide
+                // if an error occurs before redirect. If redirect is immediate, this might not run.
+                showLoader(false);
+            }
+        });
+    }
+});
diff --git a/frontend/templates/index.html b/frontend/templates/index.html
new file mode 100644
index 0000000..abd95dc
--- /dev/null
+++ b/frontend/templates/index.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>BlueNest - Feed</title>
+    <link rel="stylesheet" href="/static/css/style.css">
+</head>
+<body>
+    <div class="container">
+        <h1>BlueNest Feed</h1>
+        <div class="create-post">
+            <h2>Create New Post</h2>
+            <form id="createPostForm">
+                <div>
+                    <label for="postContent">What's on your mind?</label>
+                    <textarea id="postContent" name="content" rows="3" required></textarea>
+                </div>
+                <button type="submit">Post</button>
+            </form>
+            <div class="loader" id="createPostLoader" style="display: none;"></div>
+            <div id="postMessage"></div>
+        </div>
+
+        <hr>
+
+        <div class="posts-section">
+            <h2>Posts</h2>
+            <div id="postsLoader" class="loader" style="display: none;"></div> <!-- Loader for initial post fetch -->
+            <div id="postsContainer">
+                <!-- Posts will be loaded here by JavaScript -->
+            </div>
+        </div>
+    </div>
+
+    <script src="/static/js/app.js"></script>
+</body>
+</html>
diff --git a/frontend/templates/login.html b/frontend/templates/login.html
new file mode 100644
index 0000000..16189d2
--- /dev/null
+++ b/frontend/templates/login.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Login - BlueNest</title>
+    <link rel="stylesheet" href="/static/css/style.css">
+</head>
+<body>
+    <div class="auth-container">
+        <h1>Login</h1>
+        <form id="loginForm">
+            <div>
+                <label for="email">Email:</label>
+                <input type="email" id="email" name="email" required>
+            </div>
+            <div>
+                <label for="password">Password:</label>
+                <input type="password" id="password" name="password" required>
+            </div>
+            <button type="submit">Login</button>
+        </form>
+        <div class="loader" style="display: none;"></div>
+        <div id="message"></div>
+        <p>Don't have an account? <a href="/register">Register here</a></p>
+    </div>
+    <script src="/static/js/auth.js"></script>
+</body>
+</html>
diff --git a/frontend/templates/register.html b/frontend/templates/register.html
new file mode 100644
index 0000000..c0aea23
--- /dev/null
+++ b/frontend/templates/register.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Register - BlueNest</title>
+    <link rel="stylesheet" href="/static/css/style.css">
+</head>
+<body>
+    <div class="auth-container">
+        <h1>Register</h1>
+        <form id="registerForm">
+            <div>
+                <label for="username">Username:</label>
+                <input type="text" id="username" name="username" required>
+            </div>
+            <div>
+                <label for="email">Email:</label>
+                <input type="email" id="email" name="email" required>
+            </div>
+            <div>
+                <label for="password">Password:</label>
+                <input type="password" id="password" name="password" required>
+            </div>
+            <button type="submit">Register</button>
+        </form>
+        <div class="loader" style="display: none;"></div>
+        <div id="message"></div>
+        <p>Already have an account? <a href="/login">Login here</a></p>
+    </div>
+    <script src="/static/js/auth.js"></script>
+</body>
+</html>


Reviews:
user: login: hoji-ai[bot]
body: ## Summary
- Added Base Flask application with user registration and login endpoints, and basic post creation/retrieval functionality.
- Implemented frontend components for user interaction with the Flask backend, including basic page templates, frontend form handling, and data display.
- Provided CSS styles for frontend layout.
- Included test cases for user registration, login, and post creation using pytest.

## Review
Reviewed recent pull request for a Flask-based web application and accompanying frontend. Recommendations were made to improve security in state management between frontend and backend, enhance the maintainability of route handling, and ensure better isolation of test states.
	
state: COMMENTED
author_association: NONE
submitted_at: 2025-05-20T17:54:58Z
user: login: mentatbot[bot]
state: COMMENTED
author_association: NONE
submitted_at: 2025-05-20T17:57:41Z
user: login: devloai[bot]
body: ### PR Summary:
This PR establishes the foundation for the BlueNest social media platform with key components:
- Project structure (frontend/backend/database)
- Backend API (Flask) with registration, login, and post functionality
- Frontend UI with registration, login, and post viewing/creation
- In-memory data storage for development
- UI/UX styling and responsive design
- Backend unit tests for API endpoints

### Review Summary:
The PR provides a solid structure for the BlueNest platform with functioning user management and post features. I've identified several security concerns that should be addressed early in the development process, including authentication token implementation, XSS vulnerabilities, and secure data storage practices. The implementation is clean and well-organized, but security should be prioritized before adding more features. Please let me know if you'd like clarification on any of my comments.

#### Follow-up suggestions:
@devloai implement JWT authentication as suggested in comment #3
@devloai fix XSS vulnerability in post content rendering
state: COMMENTED
author_association: NONE
submitted_at: 2025-05-20T17:58:47Z

Review comments:
diff_hunk: @@ -0,0 +1,89 @@
+from flask import Flask, request, jsonify
+from flask_bcrypt import Bcrypt
+from flask_cors import CORS
+
+app = Flask(__name__)
+CORS(app) # Enable CORS for all routes
+bcrypt = Bcrypt(app)
+
+# In-memory data stores
+users = []
+posts = []
+user_id_counter = 1
+post_id_counter = 1
+
+@app.route('/register', methods=['POST'])
+def register():
+    global user_id_counter
+    data = request.get_json()
+    username = data.get('username')
+    email = data.get('email')
+    password = data.get('password')
+
+    if not username or not email or not password:
+        return jsonify({'error': 'Missing username, email, or password'}), 400
+
+    # Check for uniqueness
+    if any(user['username'] == username for user in users):
+        return jsonify({'error': 'Username already exists'}), 409
+    if any(user['email'] == email for user in users):
+        return jsonify({'error': 'Email already exists'}), 409
+
+    hashed_password = bcrypt.generate_password_hash(password).decode('utf-8')
+    
+    new_user = {
+        'user_id': user_id_counter,
+        'username': username,
+        'email': email,
+        'password_hash': hashed_password
+    }
+    users.append(new_user)
+    user_id_counter += 1
+    return jsonify({'message': 'User registered successfully', 'user': new_user}), 201
+
+@app.route('/login', methods=['POST'])
+def login():
+    data = request.get_json()
+    email = data.get('email')
+    password = data.get('password')
+
+    if not email or not password:
+        return jsonify({'error': 'Missing email or password'}), 400
+
+    user = next((user for user in users if user['email'] == email), None)
+
+    if user and bcrypt.check_password_hash(user['password_hash'], password):
+        # In a real app, return a token (e.g., JWT)
+        return jsonify({'message': 'Login successful', 'user_id': user['user_id']}), 200
+    else:
+        return jsonify({'error': 'Invalid email or password'}), 401
+
+@app.route('/posts', methods=['POST'])
+def create_post():
+    global post_id_counter
+    data = request.get_json()
+    user_id = data.get('user_id') 
+    content = data.get('content')
+
+    if not user_id or not content:
+        return jsonify({'error': 'Missing user_id or content'}), 400
+
+    # Check if user exists (optional, but good practice)
+    if not any(user['user_id'] == user_id for user in users):
+        return jsonify({'error': 'User not found'}), 404
+        
+    new_post = {
+        'post_id': post_id_counter,
+        'user_id': user_id,
+        'content': content
+    }
+    posts.append(new_post)
+    post_id_counter += 1
+    return jsonify({'message': 'Post created successfully', 'post': new_post}), 201
+
+@app.route('/posts', methods=['GET'])
+def get_posts():
+    return jsonify(posts), 200
+
path: backend/app.py
user: login: hoji-ai[bot]
body: Running the Flask app in debug mode is suitable for development, but be aware that it exposes detailed error information and automatically reloads the server on file changes. Make sure to disable debug mode in a production environment.
created_at: 2025-05-20T17:54:57Z
author_association: NONE
diff_hunk: @@ -0,0 +1,211 @@
+import pytest
+import json
+
+# Assuming tests are run from the 'backend' directory (e.g., `cd backend; python -m pytest`)
+# So, 'app.py' is in the current path.
+from app import app as flask_app  # This is the Flask instance: app = Flask(__name__)
+from app import users, posts      # These are the global lists: users = [], posts = []
path: backend/tests/test_app.py
user: login: hoji-ai[bot]
body: Manipulating global variables directly in your tests can lead to state pollution across tests. Consider encapsulating these in a class or reset them consistently using teardown methods to ensure isolated test executions.
created_at: 2025-05-20T17:54:57Z
author_association: NONE
diff_hunk: @@ -0,0 +1,34 @@
+# frontend/serve_frontend.py
+import http.server
+import socketserver
+import os
+
+PORT = 8000
+WEB_DIR = os.path.dirname(os.path.abspath(__file__)) # Should serve from the 'frontend' directory
+
+class Handler(http.server.SimpleHTTPRequestHandler):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, directory=WEB_DIR, **kwargs)
+
+    def do_GET(self):
+        original_path = self.path
+        
+        if original_path == '/':
path: frontend/serve_frontend.py
user: login: hoji-ai[bot]
body: Handling only predefined paths ('/', '/register', '/login') can be limiting as more features are added. Consider using a more dynamic or modular approach for mapping routes, especially as the application grows.
created_at: 2025-05-20T17:54:57Z
author_association: NONE
diff_hunk: @@ -0,0 +1,117 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const createPostForm = document.getElementById('createPostForm');
+    const postMessageDiv = document.getElementById('postMessage');
+    const postsContainer = document.getElementById('postsContainer');
+    const createPostLoader = document.getElementById('createPostLoader');
+    const postsLoader = document.getElementById('postsLoader'); // Loader for the feed
+    const createPostButton = createPostForm ? createPostForm.querySelector('button[type="submit"]') : null;
+
+    const showCreatePostLoader = (show) => {
+        if (createPostLoader) createPostLoader.style.display = show ? 'block' : 'none';
+        if (createPostButton) createPostButton.disabled = show;
+    };
+
+    const showPostsLoader = (show) => {
+        if (postsLoader) postsLoader.style.display = show ? 'block' : 'none';
+    };
+
+    const displayPostMessage = (message, type) => {
+        if (postMessageDiv) {
+            postMessageDiv.textContent = message;
+            postMessageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    const fetchAndDisplayPosts = async () => {
+        if (!postsContainer) return;
+        showPostsLoader(true);
+        postsContainer.innerHTML = ''; // Clear previous posts before loading
+
+        try {
+            const response = await fetch('http://localhost:5000/posts');
+            if (!response.ok) {
+                postsContainer.innerHTML = '<p>Error loading posts. Could not connect to server.</p>';
+                console.error('Failed to fetch posts:', response.status);
+                return;
+            }
+            const posts = await response.json();
+            if (posts.length === 0) {
+                postsContainer.innerHTML = '<p>No posts yet. Be the first to create one!</p>';
+                return;
+            }
+            // postsContainer.innerHTML = ''; // Already cleared
+            posts.forEach(post => {
+                const postElement = document.createElement('div');
+                postElement.className = 'post';
+                // In a real app, user_id would be used to fetch username
+                postElement.innerHTML = `
+                    <h3>Post by User #${post.user_id}</h3>
+                    <p>${post.content.replace(/\n/g, '<br>')}</p> 
+                    <small>Post ID: ${post.post_id}</small>
+                `;
+                postsContainer.appendChild(postElement);
+            });
+        } catch (error) {
+            console.error('Error fetching posts:', error);
+            postsContainer.innerHTML = '<p>Error loading posts. Please try again later.</p>';
+        } finally {
+            showPostsLoader(false);
+        }
+    };
+
+    if (createPostForm) {
+        createPostForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayPostMessage('', ''); // Clear previous messages
+            showCreatePostLoader(true);
+            const content = document.getElementById('postContent').value;
+            
+            // Retrieve user info from localStorage
+            const userInfo = JSON.parse(localStorage.getItem('userInfo'));
+            let userId; 
+            if (userInfo && userInfo.userId) {
+                userId = userInfo.userId;
+            } else {
+                displayPostMessage('You must be logged in to post. Redirecting to login...', 'error');
path: frontend/static/js/app.js
user: login: hoji-ai[bot]
body: Instead of hardcoding a 2-second delay, consider a dynamic approach like displaying an overlay with a spinner and redirecting once asynchronous authentication confirmation is received. Also, inform the user UI-wise while the navigation is in progress.
created_at: 2025-05-20T17:54:57Z
author_association: NONE
diff_hunk: @@ -0,0 +1,117 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const createPostForm = document.getElementById('createPostForm');
+    const postMessageDiv = document.getElementById('postMessage');
+    const postsContainer = document.getElementById('postsContainer');
+    const createPostLoader = document.getElementById('createPostLoader');
+    const postsLoader = document.getElementById('postsLoader'); // Loader for the feed
+    const createPostButton = createPostForm ? createPostForm.querySelector('button[type="submit"]') : null;
+
+    const showCreatePostLoader = (show) => {
+        if (createPostLoader) createPostLoader.style.display = show ? 'block' : 'none';
+        if (createPostButton) createPostButton.disabled = show;
+    };
+
+    const showPostsLoader = (show) => {
+        if (postsLoader) postsLoader.style.display = show ? 'block' : 'none';
+    };
+
+    const displayPostMessage = (message, type) => {
+        if (postMessageDiv) {
+            postMessageDiv.textContent = message;
+            postMessageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    const fetchAndDisplayPosts = async () => {
+        if (!postsContainer) return;
+        showPostsLoader(true);
+        postsContainer.innerHTML = ''; // Clear previous posts before loading
+
+        try {
+            const response = await fetch('http://localhost:5000/posts');
+            if (!response.ok) {
+                postsContainer.innerHTML = '<p>Error loading posts. Could not connect to server.</p>';
+                console.error('Failed to fetch posts:', response.status);
+                return;
+            }
+            const posts = await response.json();
+            if (posts.length === 0) {
+                postsContainer.innerHTML = '<p>No posts yet. Be the first to create one!</p>';
+                return;
+            }
+            // postsContainer.innerHTML = ''; // Already cleared
+            posts.forEach(post => {
+                const postElement = document.createElement('div');
+                postElement.className = 'post';
+                // In a real app, user_id would be used to fetch username
+                postElement.innerHTML = `
+                    <h3>Post by User #${post.user_id}</h3>
+                    <p>${post.content.replace(/\n/g, '<br>')}</p> 
+                    <small>Post ID: ${post.post_id}</small>
+                `;
+                postsContainer.appendChild(postElement);
+            });
+        } catch (error) {
+            console.error('Error fetching posts:', error);
+            postsContainer.innerHTML = '<p>Error loading posts. Please try again later.</p>';
+        } finally {
+            showPostsLoader(false);
+        }
+    };
+
+    if (createPostForm) {
+        createPostForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayPostMessage('', ''); // Clear previous messages
+            showCreatePostLoader(true);
+            const content = document.getElementById('postContent').value;
+            
+            // Retrieve user info from localStorage
path: frontend/static/js/app.js
user: login: hoji-ai[bot]
body: Storing data such as user credentials (even IDs) in localStorage should be done with consideration for security. It's generally more secure to handle sensitive information server-side and use tokens or session IDs for authentication management.
created_at: 2025-05-20T17:54:58Z
author_association: NONE
diff_hunk: @@ -0,0 +1,92 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const registerForm = document.getElementById('registerForm');
+    const loginForm = document.getElementById('loginForm');
+    const messageDiv = document.getElementById('message');
+    // General selector for loader, assuming one loader per auth page
+    const loader = document.querySelector('.loader'); 
+    const submitButton = document.querySelector('button[type="submit"]');
+
+    const showLoader = (show) => {
+        if (loader) loader.style.display = show ? 'block' : 'none';
+        if (submitButton) submitButton.disabled = show;
+    };
+
+    const displayMessage = (message, type) => {
+        if (messageDiv) {
+            messageDiv.textContent = message;
+            messageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    if (registerForm) {
+        registerForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayMessage('', ''); // Clear previous messages
+            showLoader(true);
+            const formData = new FormData(registerForm);
+            const data = Object.fromEntries(formData.entries());
+
+            try {
+                const response = await fetch('http://localhost:5000/register', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(data),
+                });
+                const result = await response.json();
+                if (response.ok) {
+                    displayMessage(`Registration successful! User ID: ${result.user.user_id}`, 'success');
+                    registerForm.reset();
+                    // Optionally redirect to login
+                    // window.location.href = '/login'; 
+                } else {
+                    displayMessage(result.error || 'Registration failed.', 'error');
+                }
+            } catch (error) {
+                console.error('Registration error:', error);
+                displayMessage('An error occurred during registration.', 'error');
+            } finally {
+                showLoader(false);
+            }
+        });
+    }
+
+    if (loginForm) {
+        loginForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayMessage('', ''); // Clear previous messages
+            showLoader(true);
+            const formData = new FormData(loginForm);
+            const data = Object.fromEntries(formData.entries());
+
+            try {
+                const response = await fetch('http://localhost:5000/login', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(data),
+                });
+                const result = await response.json();
+                if (response.ok) {
+                    // Message displayed by redirecting page or not at all
+                    localStorage.setItem('userInfo', JSON.stringify({ userId: result.user_id, email: data.email }));
+                    loginForm.reset();
+                    // Redirect to the main feed page
+                    window.location.href = '/'; 
+                    // No displayMessage here because of redirect
+                } else {
+                    displayMessage(result.error || 'Login failed.', 'error');
+                }
path: frontend/static/js/auth.js
user: login: hoji-ai[bot]
body: Consider avoiding storing sensitive information like user IDs in localStorage. Although this implementation seems basic, in a full application you'd better handle authentication tokens and sensitive data more securely, likely involving server-side sessions or secure cookies instead of client-side storage.
created_at: 2025-05-20T17:54:58Z
author_association: NONE
diff_hunk: @@ -0,0 +1,89 @@
+from flask import Flask, request, jsonify
+from flask_bcrypt import Bcrypt
+from flask_cors import CORS
+
+app = Flask(__name__)
+CORS(app) # Enable CORS for all routes
+bcrypt = Bcrypt(app)
+
+# In-memory data stores
+users = []
+posts = []
+user_id_counter = 1
+post_id_counter = 1
path: backend/app.py
user: login: mentatbot[bot]
body: For a more production-ready application, consider:
1. Using an application factory pattern for better testability
2. Configuring CORS for specific origins rather than allowing all origins
3. Moving data storage to a proper database (as outlined in your schema.md)
4. Using a more thread-safe approach for ID counters when moving beyond single-threaded development
created_at: 2025-05-20T17:57:22Z
author_association: NONE
diff_hunk: @@ -0,0 +1,89 @@
+from flask import Flask, request, jsonify
+from flask_bcrypt import Bcrypt
+from flask_cors import CORS
+
+app = Flask(__name__)
+CORS(app) # Enable CORS for all routes
+bcrypt = Bcrypt(app)
+
+# In-memory data stores
+users = []
+posts = []
+user_id_counter = 1
+post_id_counter = 1
+
+@app.route('/register', methods=['POST'])
+def register():
+    global user_id_counter
+    data = request.get_json()
+    username = data.get('username')
+    email = data.get('email')
+    password = data.get('password')
+
+    if not username or not email or not password:
+        return jsonify({'error': 'Missing username, email, or password'}), 400
+
+    # Check for uniqueness
+    if any(user['username'] == username for user in users):
+        return jsonify({'error': 'Username already exists'}), 409
+    if any(user['email'] == email for user in users):
+        return jsonify({'error': 'Email already exists'}), 409
+
+    hashed_password = bcrypt.generate_password_hash(password).decode('utf-8')
+    
+    new_user = {
+        'user_id': user_id_counter,
+        'username': username,
+        'email': email,
+        'password_hash': hashed_password
+    }
+    users.append(new_user)
+    user_id_counter += 1
+    return jsonify({'message': 'User registered successfully', 'user': new_user}), 201
+
+@app.route('/login', methods=['POST'])
+def login():
+    data = request.get_json()
+    email = data.get('email')
+    password = data.get('password')
+
+    if not email or not password:
+        return jsonify({'error': 'Missing email or password'}), 400
+
+    user = next((user for user in users if user['email'] == email), None)
+
+    if user and bcrypt.check_password_hash(user['password_hash'], password):
+        # In a real app, return a token (e.g., JWT)
+        return jsonify({'message': 'Login successful', 'user_id': user['user_id']}), 200
path: backend/app.py
user: login: mentatbot[bot]
body: This modification improves the login endpoint by:
1. Returning more user data besides just the ID
2. Structuring the response in a way that would make implementing proper authentication easier in the future
3. Preparing for a pattern where you'd return a JWT token with user information
```suggestion
        # Create a simple token for authentication (In real app, use JWT with expiration)
        user_data = {
            'user_id': user['user_id'],
            'username': user['username']
        }
        return jsonify({'message': 'Login successful', 'user_data': user_data}), 200
```
created_at: 2025-05-20T17:57:23Z
author_association: NONE
diff_hunk: @@ -0,0 +1,92 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const registerForm = document.getElementById('registerForm');
+    const loginForm = document.getElementById('loginForm');
+    const messageDiv = document.getElementById('message');
+    // General selector for loader, assuming one loader per auth page
+    const loader = document.querySelector('.loader'); 
+    const submitButton = document.querySelector('button[type="submit"]');
+
+    const showLoader = (show) => {
+        if (loader) loader.style.display = show ? 'block' : 'none';
+        if (submitButton) submitButton.disabled = show;
+    };
+
+    const displayMessage = (message, type) => {
+        if (messageDiv) {
+            messageDiv.textContent = message;
+            messageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    if (registerForm) {
+        registerForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayMessage('', ''); // Clear previous messages
+            showLoader(true);
+            const formData = new FormData(registerForm);
+            const data = Object.fromEntries(formData.entries());
+
+            try {
+                const response = await fetch('http://localhost:5000/register', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(data),
+                });
+                const result = await response.json();
+                if (response.ok) {
+                    displayMessage(`Registration successful! User ID: ${result.user.user_id}`, 'success');
+                    registerForm.reset();
+                    // Optionally redirect to login
+                    // window.location.href = '/login'; 
+                } else {
+                    displayMessage(result.error || 'Registration failed.', 'error');
+                }
+            } catch (error) {
+                console.error('Registration error:', error);
+                displayMessage('An error occurred during registration.', 'error');
+            } finally {
+                showLoader(false);
+            }
+        });
+    }
+
+    if (loginForm) {
+        loginForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayMessage('', ''); // Clear previous messages
+            showLoader(true);
+            const formData = new FormData(loginForm);
+            const data = Object.fromEntries(formData.entries());
+
+            try {
+                const response = await fetch('http://localhost:5000/login', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(data),
+                });
+                const result = await response.json();
+                if (response.ok) {
+                    // Message displayed by redirecting page or not at all
+                    localStorage.setItem('userInfo', JSON.stringify({ userId: result.user_id, email: data.email }));
+                    loginForm.reset();
+                    // Redirect to the main feed page
+                    window.location.href = '/'; 
+                    // No displayMessage here because of redirect
path: frontend/static/js/auth.js
user: login: mentatbot[bot]
body: This improvement:
1. Prepares for the suggested backend API change
2. Adds better security by not storing sensitive information like email
3. Adds a timestamp for potential session management
4. Provides feedback to the user before redirecting
5. Includes comments about the security implications of localStorage
```suggestion
                    // When API changes to return user_data instead of user_id
                    const userData = result.user_data || { user_id: result.user_id };
                    
                    // In production, consider using secure HTTP-only cookies instead
                    // of localStorage for sensitive authentication data
                    localStorage.setItem('userInfo', JSON.stringify({ 
                        userId: userData.user_id,
                        username: userData.username,
                        // Don't store email or other sensitive info
                        lastLogin: new Date().toISOString()
                    }));
                    
                    displayMessage('Login successful! Redirecting...', 'success');
                    loginForm.reset();
                    
                    // Short delay for user to see success message
                    setTimeout(() => {
                        window.location.href = '/';
                    }, 800);
```
created_at: 2025-05-20T17:57:23Z
author_association: NONE
diff_hunk: @@ -0,0 +1,211 @@
+import pytest
+import json
+
+# Assuming tests are run from the 'backend' directory (e.g., `cd backend; python -m pytest`)
+# So, 'app.py' is in the current path.
+from app import app as flask_app  # This is the Flask instance: app = Flask(__name__)
+from app import users, posts      # These are the global lists: users = [], posts = []
+import app as app_module          # This is the module app.py itself, to reset global counters
path: backend/tests/test_app.py
user: login: mentatbot[bot]
body: This improvement creates a more structured approach to managing test data:
1. Encapsulates the data access and reset operations
2. Makes it clearer how test data is being managed
3. Provides a foundation for more sophisticated test data management as the app grows
4. Later you could extend this to use database transactions or mocking
```suggestion
# Import the Flask app and create a more structured approach for test data management
from app import app as flask_app
import app as app_module

# Create a test data manager to isolate test state
class TestDataManager:
    @staticmethod
    def reset_data():
        """Reset all application data between tests"""
        app_module.users.clear()
        app_module.posts.clear()
        app_module.user_id_counter = 1
        app_module.post_id_counter = 1
    
    @staticmethod
    def get_users():
        return app_module.users
    
    @staticmethod
    def get_posts():
        return app_module.posts
```
created_at: 2025-05-20T17:57:23Z
author_association: NONE
diff_hunk: @@ -0,0 +1,211 @@
+import pytest
+import json
+
+# Assuming tests are run from the 'backend' directory (e.g., `cd backend; python -m pytest`)
+# So, 'app.py' is in the current path.
+from app import app as flask_app  # This is the Flask instance: app = Flask(__name__)
+from app import users, posts      # These are the global lists: users = [], posts = []
+import app as app_module          # This is the module app.py itself, to reset global counters
+
+@pytest.fixture
+def client():
+    flask_app.config['TESTING'] = True
+    
+    # Reset global in-memory stores and counters from app_module before each test
+    users.clear()  # Direct modification of imported list 'users'
+    posts.clear()  # Direct modification of imported list 'posts'
+    
+    # Counters are global variables in app.py. To reset them, we need to modify them in their module.
+    app_module.user_id_counter = 1
+    app_module.post_id_counter = 1
+    
+    with flask_app.test_client() as current_client:
+        yield current_client
+    
+    # Optional: Cleanup after tests. Resetting at the start of the fixture is typical for pytest.
+    # users.clear()
+    # posts.clear()
+    # app_module.user_id_counter = 1
+    # app_module.post_id_counter = 1
path: backend/tests/test_app.py
user: login: mentatbot[bot]
body: This improved test fixture:
1. Uses the proposed TestDataManager for cleaner state management
2. Removes direct manipulation of imported global variables
3. Makes the intent clearer through better documentation
4. Removes commented-out code that adds noise
```suggestion
    """Create a test client with a clean application state"""
    flask_app.config['TESTING'] = True
    
    # Reset application state before each test using the TestDataManager
    TestDataManager.reset_data()
    
    with flask_app.test_client() as current_client:
        yield current_client
    
    # Optionally reset after tests as well, but typically not needed with pytest's isolation
```
created_at: 2025-05-20T17:57:23Z
author_association: NONE
diff_hunk: @@ -0,0 +1,34 @@
+# frontend/serve_frontend.py
+import http.server
+import socketserver
+import os
+
+PORT = 8000
+WEB_DIR = os.path.dirname(os.path.abspath(__file__)) # Should serve from the 'frontend' directory
+
+class Handler(http.server.SimpleHTTPRequestHandler):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, directory=WEB_DIR, **kwargs)
+
+    def do_GET(self):
+        original_path = self.path
+        
+        if original_path == '/':
+            self.path = '/templates/index.html'
+        elif original_path == '/register':
+            self.path = '/templates/register.html'
+        elif original_path == '/login':
+            self.path = '/templates/login.html'
+        # For other paths like /static/css/style.css or /static/js/auth.js,
+        # SimpleHTTPRequestHandler will serve them directly from the WEB_DIR 
+        # (e.g., WEB_DIR/static/css/style.css)
+        # So, no specific handling is needed for them here, self.path remains as is.
+
+        # print(f"Serving request: Original='{original_path}', Mapped='{self.path}' relative to '{WEB_DIR}'")
+        return http.server.SimpleHTTPRequestHandler.do_GET(self)
path: frontend/serve_frontend.py
user: login: mentatbot[bot]
body: For future development, consider:
1. Using a more robust web server like Flask's built-in server with proper templates
2. Implementing a router that can handle more dynamic paths (e.g., /user/{id})
3. Adding error handling for 404s with custom pages
4. Supporting other HTTP methods like POST for form submissions directly

While this simple handler works for development, it has limitations for a production application.
created_at: 2025-05-20T17:57:23Z
author_association: NONE
diff_hunk: @@ -0,0 +1,117 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const createPostForm = document.getElementById('createPostForm');
+    const postMessageDiv = document.getElementById('postMessage');
+    const postsContainer = document.getElementById('postsContainer');
+    const createPostLoader = document.getElementById('createPostLoader');
+    const postsLoader = document.getElementById('postsLoader'); // Loader for the feed
+    const createPostButton = createPostForm ? createPostForm.querySelector('button[type="submit"]') : null;
+
+    const showCreatePostLoader = (show) => {
+        if (createPostLoader) createPostLoader.style.display = show ? 'block' : 'none';
+        if (createPostButton) createPostButton.disabled = show;
+    };
+
+    const showPostsLoader = (show) => {
+        if (postsLoader) postsLoader.style.display = show ? 'block' : 'none';
+    };
+
+    const displayPostMessage = (message, type) => {
+        if (postMessageDiv) {
+            postMessageDiv.textContent = message;
+            postMessageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    const fetchAndDisplayPosts = async () => {
+        if (!postsContainer) return;
+        showPostsLoader(true);
+        postsContainer.innerHTML = ''; // Clear previous posts before loading
+
+        try {
+            const response = await fetch('http://localhost:5000/posts');
+            if (!response.ok) {
+                postsContainer.innerHTML = '<p>Error loading posts. Could not connect to server.</p>';
+                console.error('Failed to fetch posts:', response.status);
+                return;
+            }
+            const posts = await response.json();
+            if (posts.length === 0) {
+                postsContainer.innerHTML = '<p>No posts yet. Be the first to create one!</p>';
+                return;
+            }
+            // postsContainer.innerHTML = ''; // Already cleared
+            posts.forEach(post => {
+                const postElement = document.createElement('div');
+                postElement.className = 'post';
+                // In a real app, user_id would be used to fetch username
+                postElement.innerHTML = `
+                    <h3>Post by User #${post.user_id}</h3>
+                    <p>${post.content.replace(/\n/g, '<br>')}</p> 
+                    <small>Post ID: ${post.post_id}</small>
+                `;
+                postsContainer.appendChild(postElement);
+            });
path: frontend/static/js/app.js
user: login: mentatbot[bot]
body: Consider these improvements for the post rendering:
1. Create a separate function to render a post for better code organization
2. Add XSS protection when rendering user-generated content (replace `post.content.replace()` with proper HTML sanitization)
3. Implement a GET `/users/{id}` endpoint to fetch usernames and use that instead of displaying user IDs
4. Add relative timestamps for posts (e.g., "2 hours ago") once you implement created_at fields
created_at: 2025-05-20T17:57:23Z
author_association: NONE
diff_hunk: @@ -0,0 +1,89 @@
+from flask import Flask, request, jsonify
+from flask_bcrypt import Bcrypt
+from flask_cors import CORS
+
+app = Flask(__name__)
+CORS(app) # Enable CORS for all routes
+bcrypt = Bcrypt(app)
+
+# In-memory data stores
+users = []
+posts = []
+user_id_counter = 1
path: backend/app.py
user: login: devloai[bot]
body: Consider using more robust data structures for in-memory storage to improve performance as data grows. Dictionary-based collections with indexes would provide faster lookups by user_id, username, or email rather than iterating through lists with 'any()' and list comprehensions. This becomes especially important as the user base grows.
created_at: 2025-05-20T17:58:47Z
author_association: NONE
diff_hunk: @@ -0,0 +1,89 @@
+from flask import Flask, request, jsonify
+from flask_bcrypt import Bcrypt
+from flask_cors import CORS
+
+app = Flask(__name__)
+CORS(app) # Enable CORS for all routes
+bcrypt = Bcrypt(app)
+
+# In-memory data stores
+users = []
+posts = []
+user_id_counter = 1
+post_id_counter = 1
+
+@app.route('/register', methods=['POST'])
+def register():
+    global user_id_counter
+    data = request.get_json()
+    username = data.get('username')
+    email = data.get('email')
+    password = data.get('password')
+
+    if not username or not email or not password:
+        return jsonify({'error': 'Missing username, email, or password'}), 400
+
+    # Check for uniqueness
+    if any(user['username'] == username for user in users):
+        return jsonify({'error': 'Username already exists'}), 409
+    if any(user['email'] == email for user in users):
+        return jsonify({'error': 'Email already exists'}), 409
+
+    hashed_password = bcrypt.generate_password_hash(password).decode('utf-8')
path: backend/app.py
user: login: devloai[bot]
body: The password hashing is properly implemented using bcrypt, which is good for security. However, there's no password validation logic (minimum length, complexity requirements, etc.). Consider adding password strength validation to ensure users create secure passwords.
created_at: 2025-05-20T17:58:47Z
author_association: NONE
diff_hunk: @@ -0,0 +1,89 @@
+from flask import Flask, request, jsonify
+from flask_bcrypt import Bcrypt
+from flask_cors import CORS
+
+app = Flask(__name__)
+CORS(app) # Enable CORS for all routes
+bcrypt = Bcrypt(app)
+
+# In-memory data stores
+users = []
+posts = []
+user_id_counter = 1
+post_id_counter = 1
+
+@app.route('/register', methods=['POST'])
+def register():
+    global user_id_counter
+    data = request.get_json()
+    username = data.get('username')
+    email = data.get('email')
+    password = data.get('password')
+
+    if not username or not email or not password:
+        return jsonify({'error': 'Missing username, email, or password'}), 400
+
+    # Check for uniqueness
+    if any(user['username'] == username for user in users):
+        return jsonify({'error': 'Username already exists'}), 409
+    if any(user['email'] == email for user in users):
+        return jsonify({'error': 'Email already exists'}), 409
+
+    hashed_password = bcrypt.generate_password_hash(password).decode('utf-8')
+    
+    new_user = {
+        'user_id': user_id_counter,
+        'username': username,
+        'email': email,
+        'password_hash': hashed_password
+    }
+    users.append(new_user)
+    user_id_counter += 1
+    return jsonify({'message': 'User registered successfully', 'user': new_user}), 201
+
+@app.route('/login', methods=['POST'])
+def login():
+    data = request.get_json()
+    email = data.get('email')
+    password = data.get('password')
+
+    if not email or not password:
+        return jsonify({'error': 'Missing email or password'}), 400
+
+    user = next((user for user in users if user['email'] == email), None)
+
+    if user and bcrypt.check_password_hash(user['password_hash'], password):
+        # In a real app, return a token (e.g., JWT)
+        return jsonify({'message': 'Login successful', 'user_id': user['user_id']}), 200
path: backend/app.py
user: login: devloai[bot]
body: The login endpoint correctly returns a success message and user_id, but as noted in the comment, a real application should return a token. Consider implementing JWT authentication now to avoid refactoring later, as authentication is a core component that other features will depend on.
created_at: 2025-05-20T17:58:47Z
author_association: NONE
diff_hunk: @@ -0,0 +1,89 @@
+from flask import Flask, request, jsonify
+from flask_bcrypt import Bcrypt
+from flask_cors import CORS
+
+app = Flask(__name__)
+CORS(app) # Enable CORS for all routes
+bcrypt = Bcrypt(app)
+
+# In-memory data stores
+users = []
+posts = []
+user_id_counter = 1
+post_id_counter = 1
+
+@app.route('/register', methods=['POST'])
+def register():
+    global user_id_counter
+    data = request.get_json()
+    username = data.get('username')
+    email = data.get('email')
+    password = data.get('password')
+
+    if not username or not email or not password:
+        return jsonify({'error': 'Missing username, email, or password'}), 400
+
+    # Check for uniqueness
+    if any(user['username'] == username for user in users):
+        return jsonify({'error': 'Username already exists'}), 409
+    if any(user['email'] == email for user in users):
+        return jsonify({'error': 'Email already exists'}), 409
+
+    hashed_password = bcrypt.generate_password_hash(password).decode('utf-8')
+    
+    new_user = {
+        'user_id': user_id_counter,
+        'username': username,
+        'email': email,
+        'password_hash': hashed_password
+    }
+    users.append(new_user)
+    user_id_counter += 1
+    return jsonify({'message': 'User registered successfully', 'user': new_user}), 201
+
+@app.route('/login', methods=['POST'])
+def login():
+    data = request.get_json()
+    email = data.get('email')
+    password = data.get('password')
+
+    if not email or not password:
+        return jsonify({'error': 'Missing email or password'}), 400
+
+    user = next((user for user in users if user['email'] == email), None)
+
+    if user and bcrypt.check_password_hash(user['password_hash'], password):
+        # In a real app, return a token (e.g., JWT)
+        return jsonify({'message': 'Login successful', 'user_id': user['user_id']}), 200
+    else:
+        return jsonify({'error': 'Invalid email or password'}), 401
+
+@app.route('/posts', methods=['POST'])
+def create_post():
+    global post_id_counter
+    data = request.get_json()
+    user_id = data.get('user_id') 
+    content = data.get('content')
+
+    if not user_id or not content:
+        return jsonify({'error': 'Missing user_id or content'}), 400
+
+    # Check if user exists (optional, but good practice)
+    if not any(user['user_id'] == user_id for user in users):
+        return jsonify({'error': 'User not found'}), 404
+        
+    new_post = {
+        'post_id': post_id_counter,
+        'user_id': user_id,
+        'content': content
+    }
+    posts.append(new_post)
+    post_id_counter += 1
+    return jsonify({'message': 'Post created successfully', 'post': new_post}), 201
+
+@app.route('/posts', methods=['GET'])
+def get_posts():
+    return jsonify(posts), 200
+
+if __name__ == '__main__':
+    app.run(debug=True)
path: backend/app.py
user: login: devloai[bot]
body: The debug mode is enabled in production code. This can expose sensitive information and should be turned off in a production environment. Consider using environment variables to control debug settings:

```python
if __name__ == '__main__':
    app.run(debug=os.environ.get('FLASK_DEBUG', 'False').lower() == 'true')
```

Don't forget to add `import os` at the top of the file.
created_at: 2025-05-20T17:58:47Z
author_association: NONE
diff_hunk: @@ -0,0 +1,92 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const registerForm = document.getElementById('registerForm');
+    const loginForm = document.getElementById('loginForm');
+    const messageDiv = document.getElementById('message');
+    // General selector for loader, assuming one loader per auth page
+    const loader = document.querySelector('.loader'); 
+    const submitButton = document.querySelector('button[type="submit"]');
+
+    const showLoader = (show) => {
+        if (loader) loader.style.display = show ? 'block' : 'none';
+        if (submitButton) submitButton.disabled = show;
+    };
+
+    const displayMessage = (message, type) => {
+        if (messageDiv) {
+            messageDiv.textContent = message;
+            messageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    if (registerForm) {
+        registerForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayMessage('', ''); // Clear previous messages
+            showLoader(true);
+            const formData = new FormData(registerForm);
+            const data = Object.fromEntries(formData.entries());
+
+            try {
+                const response = await fetch('http://localhost:5000/register', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(data),
+                });
+                const result = await response.json();
+                if (response.ok) {
+                    displayMessage(`Registration successful! User ID: ${result.user.user_id}`, 'success');
+                    registerForm.reset();
+                    // Optionally redirect to login
+                    // window.location.href = '/login'; 
+                } else {
+                    displayMessage(result.error || 'Registration failed.', 'error');
+                }
+            } catch (error) {
+                console.error('Registration error:', error);
+                displayMessage('An error occurred during registration.', 'error');
+            } finally {
+                showLoader(false);
+            }
+        });
+    }
+
+    if (loginForm) {
+        loginForm.addEventListener('submit', async (event) => {
+            event.preventDefault();
+            displayMessage('', ''); // Clear previous messages
+            showLoader(true);
+            const formData = new FormData(loginForm);
+            const data = Object.fromEntries(formData.entries());
+
+            try {
+                const response = await fetch('http://localhost:5000/login', {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                    },
+                    body: JSON.stringify(data),
+                });
+                const result = await response.json();
+                if (response.ok) {
path: frontend/static/js/auth.js
user: login: devloai[bot]
body: Storing user credentials in localStorage is not secure as it's vulnerable to XSS attacks. Consider using HTTP-only cookies for authentication tokens instead, which are not accessible via JavaScript. If you must store data client-side, avoid storing sensitive information like emails.
created_at: 2025-05-20T17:58:47Z
author_association: NONE
diff_hunk: @@ -0,0 +1,117 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const createPostForm = document.getElementById('createPostForm');
+    const postMessageDiv = document.getElementById('postMessage');
+    const postsContainer = document.getElementById('postsContainer');
+    const createPostLoader = document.getElementById('createPostLoader');
+    const postsLoader = document.getElementById('postsLoader'); // Loader for the feed
+    const createPostButton = createPostForm ? createPostForm.querySelector('button[type="submit"]') : null;
+
+    const showCreatePostLoader = (show) => {
+        if (createPostLoader) createPostLoader.style.display = show ? 'block' : 'none';
+        if (createPostButton) createPostButton.disabled = show;
+    };
+
+    const showPostsLoader = (show) => {
+        if (postsLoader) postsLoader.style.display = show ? 'block' : 'none';
+    };
+
+    const displayPostMessage = (message, type) => {
+        if (postMessageDiv) {
+            postMessageDiv.textContent = message;
+            postMessageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    const fetchAndDisplayPosts = async () => {
+        if (!postsContainer) return;
+        showPostsLoader(true);
+        postsContainer.innerHTML = ''; // Clear previous posts before loading
+
+        try {
+            const response = await fetch('http://localhost:5000/posts');
+            if (!response.ok) {
+                postsContainer.innerHTML = '<p>Error loading posts. Could not connect to server.</p>';
+                console.error('Failed to fetch posts:', response.status);
+                return;
+            }
+            const posts = await response.json();
path: frontend/static/js/app.js
user: login: devloai[bot]
body: There's no error handling for different HTTP status codes. Consider adding specific error messages based on status codes (400, 401, 403, 500, etc.) to provide more helpful information to users when things go wrong.
created_at: 2025-05-20T17:58:47Z
author_association: NONE
diff_hunk: @@ -0,0 +1,117 @@
+document.addEventListener('DOMContentLoaded', () => {
+    const createPostForm = document.getElementById('createPostForm');
+    const postMessageDiv = document.getElementById('postMessage');
+    const postsContainer = document.getElementById('postsContainer');
+    const createPostLoader = document.getElementById('createPostLoader');
+    const postsLoader = document.getElementById('postsLoader'); // Loader for the feed
+    const createPostButton = createPostForm ? createPostForm.querySelector('button[type="submit"]') : null;
+
+    const showCreatePostLoader = (show) => {
+        if (createPostLoader) createPostLoader.style.display = show ? 'block' : 'none';
+        if (createPostButton) createPostButton.disabled = show;
+    };
+
+    const showPostsLoader = (show) => {
+        if (postsLoader) postsLoader.style.display = show ? 'block' : 'none';
+    };
+
+    const displayPostMessage = (message, type) => {
+        if (postMessageDiv) {
+            postMessageDiv.textContent = message;
+            postMessageDiv.className = type; // 'success' or 'error'
+        }
+    };
+
+    const fetchAndDisplayPosts = async () => {
+        if (!postsContainer) return;
+        showPostsLoader(true);
+        postsContainer.innerHTML = ''; // Clear previous posts before loading
+
+        try {
+            const response = await fetch('http://localhost:5000/posts');
+            if (!response.ok) {
+                postsContainer.innerHTML = '<p>Error loading posts. Could not connect to server.</p>';
+                console.error('Failed to fetch posts:', response.status);
+                return;
+            }
+            const posts = await response.json();
+            if (posts.length === 0) {
+                postsContainer.innerHTML = '<p>No posts yet. Be the first to create one!</p>';
+                return;
+            }
+            // postsContainer.innerHTML = ''; // Already cleared
+            posts.forEach(post => {
+                const postElement = document.createElement('div');
+                postElement.className = 'post';
+                // In a real app, user_id would be used to fetch username
+                postElement.innerHTML = `
+                    <h3>Post by User #${post.user_id}</h3>
+                    <p>${post.content.replace(/\n/g, '<br>')}</p> 
path: frontend/static/js/app.js
user: login: devloai[bot]
body: Directly inserting HTML content from user inputs can lead to Cross-Site Scripting (XSS) vulnerabilities. The post content needs to be properly sanitized before rendering:

```suggestion
                    <p>${escapeHTML(post.content).replace(/\n/g, '<br>')}</p>
```

Add an escapeHTML function that sanitizes user input by escaping HTML special characters.
created_at: 2025-05-20T17:58:47Z
author_association: NONE

PR comments:
user: login: mentatbot[bot]
created_at: 2025-05-20T17:54:27Z
body: I'm getting to work. See my steps and track my cost [here](https://mentat.ai/gh/vuyp/bluenest/agent/2aca9c33-004e-49a1-8589-d4bc657d7f98).

- [ ] Wake on any new activity.
<sub>I always see new activity while actively working. When paused, I'll only respond when tagged unless this box is checked.</sub>
author_association: NONE
user: login: mentatbot[bot]
created_at: 2025-05-20T17:57:43Z
body: # BlueNest Initial Setup PR Review

I've reviewed the code and ran the tests - everything passes successfully. This is a solid foundation for a social media platform with core functionality in place. Here are some observations and suggestions for future improvements:

## General Architecture

- **Separation of Concerns**: Consider restructuring the Flask application to follow a more modular pattern (blueprints, factory pattern) as the application grows.
- **Database Integration**: The current in-memory data storage works for prototyping but implementing the database schema in `database/schema.md` with SQLAlchemy would be a logical next step.
- **Configuration Management**: Add a configuration system to handle different environments (dev, test, prod).
- **Documentation**: Consider adding API documentation (e.g., using Swagger/OpenAPI).

## Security Enhancements

- **Authentication**: Implement JWT or session-based authentication rather than storing user IDs in localStorage.
- **Password Policies**: Add password strength requirements.
- **CSRF Protection**: Implement CSRF protection for form submissions.
- **Input Sanitization**: Add more thorough input validation and sanitization, especially for post content.
- **Rate Limiting**: Implement rate limiting for authentication endpoints to prevent brute force attacks.

## Backend Improvements

- **API Versioning**: Consider adding API versioning (e.g., `/api/v1/posts`).
- **Error Handling**: Implement a global error handler for more consistent error responses.
- **Logging**: Add proper logging throughout the application.
- **Query Parameters**: Add support for pagination, filtering, and sorting on the `/posts` endpoint.
- **Timestamps**: Add created_at/updated_at fields to users and posts as mentioned in the schema.

## Frontend Enhancements

- **Environment Variables**: Use environment variables for API URLs instead of hardcoding localhost:5000.
- **Form Validation**: Add client-side validation for forms.
- **State Management**: Consider a more structured approach to state management as the app grows.
- **Accessibility**: Improve accessibility with proper ARIA attributes and semantic HTML.
- **UI Feedback**: Add more user feedback for actions (loading states, success/error messages).

## Testing Improvements

- **Test Organization**: Organize tests by feature or resource type.
- **Mock Services**: Use mocks instead of directly manipulating global state.
- **Integration Tests**: Add integration tests between frontend and backend.
- **Test Coverage**: Expand test coverage to include more edge cases.

Overall, this is a strong foundation for the BlueNest platform. The code is clean, well-structured, and includes comprehensive tests for the basic functionality. These suggestions are meant for future development iterations as the platform grows.
author_association: NONE