Merge pull request 'Refactor and Enhance Admin Panel: Security, Logging, and Code Quality Improvements' (#2) from newsletter into main

Reviewed-on: https://brew.bsd.cafe/RideAware/admin-panel/pulls/2

Dockerfile

@@ -16,4 +16,3 @@ ENV FLASK_APP=server.py
 EXPOSE 5001
 
 CMD ["gunicorn", "--bind", "0.0.0.0:5001", "app:app"]
-

app.py

@@ -1,103 +1,136 @@
 import os
+import logging
 import smtplib
 from email.mime.text import MIMEText
-from flask import Flask, render_template, request, redirect, url_for, flash, session
+from flask import (
+    Flask,
+    render_template,
+    request,
+    redirect,
+    url_for,
+    flash,
+    session,
+)
 from dotenv import load_dotenv
 from werkzeug.security import check_password_hash
+from functools import wraps  # Import wraps
 from database import get_connection, init_db, get_all_emails, get_admin, create_default_admin
 
 load_dotenv()
 app = Flask(__name__)
-# Use a secret key from .env; ensure your .env sets SECRET_KEY
-app.secret_key = os.getenv('SECRET_KEY')
-base_url = os.getenv('BASE_URL')
+app.secret_key = os.getenv("SECRET_KEY")
+base_url = os.getenv("BASE_URL")
 
 # SMTP settings (for sending update emails)
-SMTP_SERVER = os.getenv('SMTP_SERVER')
+SMTP_SERVER = os.getenv("SMTP_SERVER")
 SMTP_PORT = int(os.getenv("SMTP_PORT", 465))
-SMTP_USER = os.getenv('SMTP_USER')
-SMTP_PASSWORD = os.getenv('SMTP_PASSWORD')
+SMTP_USER = os.getenv("SMTP_USER")
+SMTP_PASSWORD = os.getenv("SMTP_PASSWORD")
+SENDER_EMAIL = os.getenv("SENDER_EMAIL", SMTP_USER) # Use SENDER_EMAIL
+
+# Logging setup
+logging.basicConfig(
+    level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
+)
+logger = logging.getLogger(__name__)
 
 # Initialize the database and create default admin user if necessary.
 init_db()
 create_default_admin()
 
+# Decorator for requiring login
 def login_required(f):
-    from functools import wraps
-    @wraps(f)
+    @wraps(f)  # Use wraps to preserve function metadata
     def decorated_function(*args, **kwargs):
         if "username" not in session:
-            return redirect(url_for('login'))
+            return redirect(url_for("login"))
         return f(*args, **kwargs)
+
     return decorated_function
 
+
+def send_update_email(subject, body, email):
+    """Sends email, returns True on success, False on failure."""
+    try:
+        server = smtplib.SMTP_SSL(SMTP_SERVER, SMTP_PORT, timeout=10)
+        server.set_debuglevel(False)  # Keep debug level at False for production
+        server.login(SMTP_USER, SMTP_PASSWORD)
+
+        unsub_link = f"https://{base_url}/unsubscribe?email={email}"
+        custom_body = (
+            f"{body}<br><br>"
+            f"If you ever wish to unsubscribe, please click <a href='{unsub_link}'>here</a>"
+        )
+
+        msg = MIMEText(custom_body, "html", "utf-8")
+        msg["Subject"] = subject
+        msg["From"] = SENDER_EMAIL  # Use sender email
+        msg["To"] = email
+
+        server.sendmail(SENDER_EMAIL, email, msg.as_string())  # Use sender email
+
+        server.quit()
+        logger.info(f"Update email sent to: {email}")
+        return True
+    except Exception as e:
+        logger.error(f"Failed to send email to {email}: {e}")
+        return False
+
+
 def process_send_update_email(subject, body):
     """Helper function to send an update email to all subscribers."""
     subscribers = get_all_emails()
     if not subscribers:
         return "No subscribers found."
     try:
-        server = smtplib.SMTP_SSL(SMTP_SERVER, SMTP_PORT, timeout=10)
-        server.set_debuglevel(True)
-        server.login(SMTP_USER, SMTP_PASSWORD)
         for email in subscribers:
-            unsub_link = f"https://{base_url}/unsubscribe?email={email}"
-            custom_body = (
-                f"{body}<br><br>"
-                f"If you ever wish to unsubscribe, please click <a href='{unsub_link}'>here</a>"
-            )
-            msg = MIMEText(custom_body, 'html', 'utf-8')
-            msg['Subject'] = subject
-            msg['From'] = SMTP_USER
-            msg['To'] = email
-            server.sendmail(SMTP_USER, email, msg.as_string())
-            print(f"Update email sent to: {email}")
-        server.quit()
-        
+            if not send_update_email(subject, body, email):
+                return f"Failed to send to {email}"  # Specific failure message
+
+        # Log newsletter content for audit purposes
         conn = get_connection()
         cursor = conn.cursor()
         cursor.execute(
-                "INSERT INTO newsletters (subject, body) VALUES (%s, %s)",
-                (subject, body)
-            )
+            "INSERT INTO newsletters (subject, body) VALUES (%s, %s)", (subject, body)
+        )
         conn.commit()
         cursor.close()
         conn.close()
 
-        return "Email has been sent."
+        return "Email has been sent to all subscribers."
     except Exception as e:
-        print(f"Failed to send email: {e}")
+        logger.exception("Error processing sending updates")
         return f"Failed to send email: {e}"
 
-@app.route('/')
+
+@app.route("/")
 @login_required
 def index():
     """Displays all subscriber emails"""
     emails = get_all_emails()
     return render_template("admin_index.html", emails=emails)
 
-@app.route('/send_update', methods=['GET', 'POST'])
+@app.route("/send_update", methods=["GET", "POST"])
 @login_required
 def send_update():
     """Display a form to send an update email; process submission on POST."""
-    if request.method == 'POST':
-        subject = request.form['subject']
-        body = request.form['body']
-        # Call the helper function using its new name.
+    if request.method == "POST":
+        subject = request.form["subject"]
+        body = request.form["body"]
         result_message = process_send_update_email(subject, body)
         flash(result_message)
         return redirect(url_for("send_update"))
     return render_template("send_update.html")
 
-@app.route('/login', methods=['GET', 'POST'])
+
+@app.route("/login", methods=["GET", "POST"])
 def login():
-    if request.method == 'POST':
-        username = request.form.get('username')
-        password = request.form.get('password')
+    if request.method == "POST":
+        username = request.form.get("username")
+        password = request.form.get("password")
         admin = get_admin(username)
-        # Expect get_admin() to return a tuple like (username, password_hash)
         if admin and check_password_hash(admin[1], password):
-            session['username'] = username
+            session["username"] = username
             flash("Logged in successfully", "success")
             return redirect(url_for("index"))
         else:
@@ -105,11 +138,13 @@ def login():
             return redirect(url_for("login"))
     return render_template("login.html")
 
-@app.route('/logout')
+
+@app.route("/logout")
 def logout():
-    session.pop('username', None)
+    session.pop("username", None)
     flash("Logged out successfully", "success")
     return redirect(url_for("login"))
 
-if __name__ == '__main__':
+
+if __name__ == "__main__":
     app.run(port=5001, debug=True)

database.py

@@ -1,43 +1,89 @@
 import os
+import logging
 import psycopg2
 from psycopg2 import IntegrityError
 from dotenv import load_dotenv
 from werkzeug.security import generate_password_hash
+
 load_dotenv()
 
+# Logging setup
+logging.basicConfig(
+    level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
+)
+logger = logging.getLogger(__name__)
+
+
 def get_connection():
     """Return a new connection to the PostgreSQL database."""
-    return psycopg2.connect(
-        host=os.getenv("PG_HOST"),
-        port=os.getenv("PG_PORT"),
-        dbname=os.getenv("PG_DATABASE"),
-        user=os.getenv("PG_USER"),
-        password=os.getenv("PG_PASSWORD"),
-        connect_timeout=10
-    )
+    try:
+        conn = psycopg2.connect(
+            host=os.getenv("PG_HOST"),
+            port=os.getenv("PG_PORT"),
+            dbname=os.getenv("PG_DATABASE"),
+            user=os.getenv("PG_USER"),
+            password=os.getenv("PG_PASSWORD"),
+            connect_timeout=10,
+        )
+        return conn
+    except Exception as e:
+        logger.error(f"Database connection error: {e}")
+        raise
+
 
 def init_db():
     """Initialize the database tables."""
-    conn = get_connection()
-    cursor = conn.cursor()
-    # Create subscribers table (if not exists)
-    cursor.execute("""
-        CREATE TABLE IF NOT EXISTS subscribers (
-            id SERIAL PRIMARY KEY,
-            email TEXT UNIQUE NOT NULL
+    conn = None
+    try:
+        conn = get_connection()
+        cursor = conn.cursor()
+
+        # Create subscribers table (if not exists)
+        cursor.execute(
+            """
+            CREATE TABLE IF NOT EXISTS subscribers (
+                id SERIAL PRIMARY KEY,
+                email TEXT UNIQUE NOT NULL
+            )
+        """
         )
-    """)
-    # Create admin_users table (if not exists)
-    cursor.execute("""
-        CREATE TABLE IF NOT EXISTS admin_users (
-            id SERIAL PRIMARY KEY,
-            username TEXT UNIQUE NOT NULL,
-            password TEXT NOT NULL
+
+        # Create admin_users table (if not exists)
+        cursor.execute(
+            """
+            CREATE TABLE IF NOT EXISTS admin_users (
+                id SERIAL PRIMARY KEY,
+                username TEXT UNIQUE NOT NULL,
+                password TEXT NOT NULL
+            )
+        """
         )
-    """)
-    conn.commit()
-    cursor.close()
-    conn.close()
+
+        # Newsletter storage
+        cursor.execute(
+            """
+        CREATE TABLE IF NOT EXISTS newsletters (
+            id SERIAL PRIMARY KEY,
+            subject TEXT NOT NULL,
+            body TEXT NOT NULL,
+            sent_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+        )
+        """
+        )
+
+        conn.commit()
+        logger.info("Database initialized successfully.")
+    except Exception as e:
+        logger.error(f"Database initialization error: {e}")
+        if conn:
+            conn.rollback()  # Rollback if there's an error
+
+        raise
+    finally:
+        if conn:
+            cursor.close()
+            conn.close()
+
 
 def get_all_emails():
     """Return a list of all subscriber emails."""
@@ -46,78 +92,112 @@ def get_all_emails():
         cursor = conn.cursor()
         cursor.execute("SELECT email FROM subscribers")
         results = cursor.fetchall()
-        cursor.close()
-        conn.close()
-        return [row[0] for row in results]
+        emails = [row[0] for row in results]
+        logger.debug(f"Retrieved emails: {emails}")
+        return emails
     except Exception as e:
-        print(f"Error retrieving emails: {e}")
+        logger.error(f"Error retrieving emails: {e}")
         return []
+    finally:
+        if conn:
+            cursor.close()
+            conn.close()
+
 
 def add_email(email):
     """Insert an email into the subscribers table."""
+    conn = None
     try:
         conn = get_connection()
         cursor = conn.cursor()
         cursor.execute("INSERT INTO subscribers (email) VALUES (%s)", (email,))
         conn.commit()
-        cursor.close()
-        conn.close()
+        logger.info(f"Email {email} added successfully.")
         return True
     except IntegrityError:
+        logger.warning(f"Attempted to add duplicate email: {email}")
         return False
     except Exception as e:
-        print(f"Error adding email: {e}")
+        logger.error(f"Error adding email {email}: {e}")
         return False
+    finally:
+        if conn:
+            cursor.close()
+            conn.close()
+
 
 def remove_email(email):
     """Remove an email from the subscribers table."""
+    conn = None
     try:
         conn = get_connection()
         cursor = conn.cursor()
         cursor.execute("DELETE FROM subscribers WHERE email = %s", (email,))
-        conn.commit()
         rowcount = cursor.rowcount
-        cursor.close()
-        conn.close()
+        conn.commit()
+        logger.info(f"Email {email} removed successfully.")
         return rowcount > 0
     except Exception as e:
-        print(f"Error removing email: {e}")
+        logger.error(f"Error removing email {email}: {e}")
         return False
+    finally:
+        if conn:
+            cursor.close()
+            conn.close()
+
 
 def get_admin(username):
     """Retrieve admin credentials for a given username.
-       Returns a tuple (username, password_hash) if found, otherwise None.
+    Returns a tuple (username, password_hash) if found, otherwise None.
     """
+    conn = None
     try:
         conn = get_connection()
         cursor = conn.cursor()
-        cursor.execute("SELECT username, password FROM admin_users WHERE username = %s", (username,))
+        cursor.execute(
+            "SELECT username, password FROM admin_users WHERE username = %s",
+            (username,),
+        )
         result = cursor.fetchone()
-        cursor.close()
-        conn.close()
         return result  # (username, password_hash)
     except Exception as e:
-        print(f"Error retrieving admin: {e}")
+        logger.error(f"Error retrieving admin: {e}")
         return None
+    finally:
+        if conn:
+            cursor.close()
+            conn.close()
+
 
 def create_default_admin():
     """Create a default admin user if one doesn't already exist."""
     default_username = os.getenv("ADMIN_USERNAME", "admin")
     default_password = os.getenv("ADMIN_PASSWORD", "changeme")
-    hashed = generate_password_hash(default_password, method="pbkdf2:sha256")
+    hashed_password = generate_password_hash(default_password, method="pbkdf2:sha256")
+    conn = None
     try:
         conn = get_connection()
         cursor = conn.cursor()
+
         # Check if the admin already exists
-        cursor.execute("SELECT id FROM admin_users WHERE username = %s", (default_username,))
+        cursor.execute(
+            "SELECT id FROM admin_users WHERE username = %s", (default_username,)
+        )
         if cursor.fetchone() is None:
-            cursor.execute("INSERT INTO admin_users (username, password) VALUES (%s, %s)",
-                           (default_username, hashed))
+            cursor.execute(
+                "INSERT INTO admin_users (username, password) VALUES (%s, %s)",
+                (default_username, hashed_password),
+            )
             conn.commit()
-            print("Default admin created successfully")
+            logger.info("Default admin created successfully")
         else:
-            print("Default admin already exists")
-        cursor.close()
-        conn.close()
+            logger.info("Default admin already exists")
     except Exception as e:
-        print(f"Error creating default admin: {e}")
+        logger.error(f"Error creating default admin: {e}")
+        if conn:
+            conn.rollback()
+    finally:
+        if conn:
+            cursor.close()
+            conn.close()
+

static/css/style.css

@@ -0,0 +1,55 @@
+body {
+    font-family: Arial, sans-serif;
+    padding: 20px;
+  }
+  
+  table {
+    border-collapse: collapse;
+    width: 100%;
+  }
+  
+  th,
+  td {
+    border: 1px solid #ddd;
+    padding: 8px;
+    text-align: left;
+  }
+  
+  th {
+    background-color: #f2f2f2;
+  }
+  
+  a {
+    margin-right: 10px;
+  }
+  
+  form {
+    max-width: 600px;
+    margin: 0 auto;
+  }
+  
+  label {
+    display: block;
+    margin-top: 15px;
+  }
+  
+  input[type="text"],
+  input[type="password"],
+  textarea {
+    width: 100%;
+    padding: 8px;
+  }
+  
+  button {
+    margin-top: 15px;
+    padding: 10px 20px;
+  }
+  
+  .flash {
+    background-color: #f8d7da;
+    color: #721c24;
+    padding: 10px;
+    margin-bottom: 10px;
+    text-align: center;
+  }
+  

templates/admin_index.html

@@ -4,30 +4,41 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Admin Center - Subscribers</title>
-    <style>
-        body { font-family: Arial, sans-serif; padding: 20px; }
-        table { border-collapse: collapse; width: 100%; }
-        th, td { border: 1px solid #ddd; padding: 8px; text-align: left; }
-        th { background-color: #f2f2f2; }
-        a { margin-right: 10px; }
-    </style>
+    <link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
 </head>
 <body>
+
     <h1>Subscribers</h1>
-  <p><a href="{{ url_for('send_update') }}">Send Update Email</a></p>
-  {% if emails %}
-    <table>
-      <tr>
-        <th>Email Address</th>
-      </tr>
-      {% for email in emails %}
-      <tr>
-        <td>{{ email }}</td>
-      </tr>
-      {% endfor %}
-    </table>
-  {% else %}
-    <p>No subscribers found.</p>
-  {% endif %}
+    <p>
+      <a href="{{ url_for('send_update') }}">Send Update Email</a>|
+      <a href="{{ url_for('logout') }}">Logout</a>
+    </p>
+
+    {% with messages = get_flashed_messages(with_categories=true) %}
+      {% if messages %}
+        {% for category, message in messages %}
+          <div class="flash">{{ message }}</div>
+        {% endfor %}
+      {% endif %}
+    {% endwith %}
+
+    {% if emails %}
+        <table>
+            <thead>
+                <tr>
+                    <th>Email Address</th>
+                </tr>
+            </thead>
+            <tbody>
+                {% for email in emails %}
+                    <tr>
+                        <td>{{ email }}</td>
+                    </tr>
+                {% endfor %}
+            </tbody>
+        </table>
+    {% else %}
+        <p>No subscribers found.</p>
+    {% endif %}
 </body>
-</html>
+</html>

templates/login.html

@@ -1,26 +1,21 @@
 <!DOCTYPE html>
 <html lang="en">
+
 <head>
-  <meta charset="UTF-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Admin Login</title>
-  <style>
-    body { font-family: Arial, sans-serif; padding: 20px; }
-    form { max-width: 400px; margin: 0 auto; }
-    label { display: block; margin-top: 15px; }
-    input[type="text"], input[type="password"] { width: 100%; padding: 8px; }
-    button { margin-top: 15px; padding: 10px 20px; }
-    .flash { background-color: #f8d7da; color: #721c24; padding: 10px; margin-bottom: 10px; text-align: center; }
-  </style>
+  <link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
 </head>
+
 <body>
   <h1>Admin Login</h1>
   {% with messages = get_flashed_messages(with_categories=true) %}
-    {% if messages %}
-      {% for category, message in messages %}
-        <div class="flash">{{ message }}</div>
-      {% endfor %}
-    {% endif %}
+  {% if messages %}
+  {% for category, message in messages %}
+  <div class="flash">{{ message }}</div>
+  {% endfor %}
+  {% endif %}
   {% endwith %}
   <form action="{{ url_for('login') }}" method="POST">
     <label for="username">Username:</label>
@@ -30,4 +25,5 @@
     <button type="submit">Login</button>
   </form>
 </body>
-</html>
+
+</html>

templates/send_update.html

@@ -1,25 +1,19 @@
 <!DOCTYPE html>
 <html lang="en">
+
 <head>
-  <meta charset="UTF-8" />
+  <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Admin Center - Send Update</title>
-  <style>
-    body { font-family: Arial, sans-serif; padding: 20px; }
-    form { max-width: 600px; }
-    label { display: block; margin-top: 15px; }
-    input[type="text"], textarea { width: 100%; padding: 8px; }
-    button { margin-top: 15px; padding: 10px 20px; }
-    .flash {
-      background-color: #f8d7da;
-      color: #721c24;
-      padding: 10px;
-      margin-bottom: 10px;
-    }
-  </style>
+  <link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
 </head>
+
 <body>
   <h1>Send Update Email</h1>
+  <p>
+    <a href="{{ url_for('index') }}">Back to Subscribers List</a> |
+    <a href="{{ url_for('logout') }}">Logout</a>
+  </p>
   {% with messages = get_flashed_messages() %}
     {% if messages %}
       {% for message in messages %}
@@ -37,9 +31,7 @@
 
     <button type="submit">Send Update</button>
   </form>
-  <p>
-    <a href="{{ url_for('index') }}">Back to Subscribers List</a> |
-    <a href="{{ url_for('logout') }}">Logout</a>
-  </p>
+
 </body>
+
 </html>