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+I'll provide you with comprehensive Firebase security implementation guidance. Here's a detailed security setup:
+
+## 1. Firebase Security Rules & Configuration
+
+### Firebase Security Rules (`firebase.json`)
+```json
+{
+  "firestore": {
+    "rules": "firestore.rules",
+    "indexes": "firestore.indexes.json"
+  },
+  "storage": {
+    "rules": "storage.rules"
+  },
+  "hosting": {
+    "public": "public",
+    "ignore": ["firebase.json", "**/.*", "**/node_modules/**"],
+    "headers": [
+      {
+        "source": "**",
+        "headers": [
+          {
+            "key": "X-Frame-Options",
+            "value": "DENY"
+          },
+          {
+            "key": "X-Content-Type-Options",
+            "value": "nosniff"
+          },
+          {
+            "key": "X-XSS-Protection",
+            "value": "1; mode=block"
+          },
+          {
+            "key": "Strict-Transport-Security",
+            "value": "max-age=31536000; includeSubDomains"
+          }
+        ]
+      }
+    ],
+    "rewrites": [
+      {
+        "source": "**",
+        "destination": "/index.html"
+      }
+    ]
+  },
+  "emulators": {
+    "auth": {
+      "port": 9099
+    },
+    "firestore": {
+      "port": 8080
+    },
+    "storage": {
+      "port": 9199
+    },
+    "ui": {
+      "enabled": true
+    }
+  }
+}
+```
+
+## 2. Firestore Security Rules
+
+### `firestore.rules`
+```javascript
+rules_version = '2';
+service cloud.firestore {
+  match /databases/{database}/documents {
+    // Global read/write control - adjust as needed
+    match /{document=**} {
+      allow read, write: if request.auth != null;
+    }
+
+    // Users can only access their own user data
+    match /users/{userId} {
+      allow read, write: if request.auth != null && request.auth.uid == userId;
+      allow create: if request.auth != null && 
+        request.auth.uid == userId &&
+        request.resource.data.keys().hasAll(['email', 'createdAt']) &&
+        request.resource.data.email is string &&
+        request.resource.data.createdAt is timestamp;
+    }
+
+    // Posts collection - users can read all, but only write their own
+    match /posts/{postId} {
+      allow read: if request.auth != null;
+      allow create: if request.auth != null &&
+        request.auth.uid == request.resource.data.authorId &&
+        request.resource.data.keys().hasAll(['title', 'content', 'createdAt']) &&
+        request.resource.data.title is string &&
+        request.resource.data.content is string &&
+        request.resource.data.createdAt is timestamp;
+      
+      allow update, delete: if request.auth != null && 
+        request.auth.uid == resource.data.authorId;
+    }
+
+    // Comments - users can read all, but only write their own
+    match /posts/{postId}/comments/{commentId} {
+      allow read: if request.auth != null;
+      allow create: if request.auth != null &&
+        request.auth.uid == request.resource.data.authorId &&
+        request.resource.data.keys().hasAll(['content', 'createdAt']) &&
+        request.resource.data.content is string &&
+        request.resource.data.createdAt is timestamp;
+      
+      allow update, delete: if request.auth != null && 
+        request.auth.uid == resource.data.authorId;
+    }
+
+    // Admin role check function
+    function isAdmin() {
+      return request.auth.token.admin == true;
+    }
+
+    // Admin-only collections
+    match /admin/{document=**} {
+      allow read, write: if isAdmin();
+    }
+
+    // Audit trail - read only for admins
+    match /audit/{document=**} {
+      allow read: if isAdmin();
+      allow write: if request.auth != null;
+    }
+  }
+}
+```
+
+## 3. Firebase Storage Security Rules
+
+### `storage.rules`
+```javascript
+rules_version = '2';
+service firebase.storage {
+  match /b/{bucket}/o {
+    // Users can only upload to their own folder
+    match /users/{userId}/{allPaths=**} {
+      allow read: if request.auth != null;
+      allow write: if request.auth != null && request.auth.uid == userId;
+    }
+
+    // Profile pictures - users can read all, but only write their own
+    match /profile_pictures/{userId} {
+      allow read: if request.auth != null;
+      allow write: if request.auth != null && request.auth.uid == userId;
+    }
+
+    // Post images - readable by all authenticated users
+    match /post_images/{postId}/{imageId} {
+      allow read: if request.auth != null;
+      allow write: if request.auth != null && 
+        exists(/databases/$(database)/documents/posts/$(postId)) &&
+        get(/databases/$(database)/documents/posts/$(postId)).data.authorId == request.auth.uid;
+    }
+
+    // Public read-only files
+    match /public/{allPaths=**} {
+      allow read: if true;
+      allow write: if request.auth != null && isAdmin();
+    }
+
+    function isAdmin() {
+      return request.auth.token.admin == true;
+    }
+  }
+}
+```
+
+## 4. Firebase Authentication Security
+
+### Security Configuration
+```javascript
+// firebase-auth-security.js
+import { initializeApp } from 'firebase/app';
+import { 
+  getAuth, 
+  createUserWithEmailAndPassword,
+  signInWithEmailAndPassword,
+  signOut,
+  updateProfile,
+  sendEmailVerification,
+  sendPasswordResetEmail,
+  setPersistence,
+  browserSessionPersistence,
+  browserLocalPersistence,
+  onAuthStateChanged
+} from 'firebase/auth';
+
+const firebaseConfig = {
+  apiKey: process.env.REACT_APP_FIREBASE_API_KEY,
+  authDomain: process.env.REACT_APP_FIREBASE_AUTH_DOMAIN,
+  projectId: process.env.REACT_APP_FIREBASE_PROJECT_ID,
+  storageBucket: process.env.REACT_APP_FIREBASE_STORAGE_BUCKET,
+  messagingSenderId: process.env.REACT_APP_FIREBASE_MESSAGING_SENDER_ID,
+  appId: process.env.REACT_APP_FIREBASE_APP_ID
+};
+
+const app = initializeApp(firebaseConfig);
+const auth = getAuth(app);
+
+class FirebaseAuthSecurity {
+  constructor() {
+    this.auth = auth;
+    this.setupSecurityPolicies();
+  }
+
+  setupSecurityPolicies() {
+    // Set session persistence based on user preference
+    setPersistence(this.auth, browserLocalPersistence);
+    
+    // Monitor auth state for security
+    onAuthStateChanged(this.auth, (user) => {
+      if (user) {
+        this.logSecurityEvent('user_signed_in', user.uid);
+        this.validateUserSession(user);
+      } else {
+        this.logSecurityEvent('user_signed_out');
+      }
+    });
+  }
+
+  async validateUserSession(user) {
+    // Check if email is verified
+    if (!user.emailVerified) {
+      await sendEmailVerification(user);
+      throw new Error('Please verify your email before proceeding');
+    }
+
+    // Check if token is recent (less than 1 hour old)
+    const tokenTime = user.metadata.lastSignInTime;
+    const currentTime = new Date();
+    const timeDiff = (currentTime - new Date(tokenTime)) / (1000 * 60 * 60);
+    
+    if (timeDiff > 24) {
+      await this.auth.signOut();
+      throw new Error('Session expired. Please sign in again.');
+    }
+  }
+
+  async secureSignUp(email, password, displayName) {
+    try {
+      // Validate password strength
+      this.validatePassword(password);
+      
+      const userCredential = await createUserWithEmailAndPassword(
+        this.auth, email, password
+      );
+      
+      // Update profile
+      await updateProfile(userCredential.user, {
+        displayName: displayName
+      });
+
+      // Send email verification
+      await sendEmailVerification(userCredential.user);
+
+      // Log security event
+      this.logSecurityEvent('user_registered', userCredential.user.uid);
+
+      return userCredential;
+    } catch (error) {
+      this.logSecurityEvent('registration_failed', null, error.message);
+      throw error;
+    }
+  }
+
+  async secureSignIn(email, password) {
+    try {
+      const userCredential = await signInWithEmailAndPassword(
+        this.auth, email, password
+      );
+
+      // Validate session
+      await this.validateUserSession(userCredential.user);
+
+      this.logSecurityEvent('login_success', userCredential.user.uid);
+      return userCredential;
+    } catch (error) {
+      this.logSecurityEvent('login_failed', null, error.message);
+      throw error;
+    }
+  }
+
+  validatePassword(password) {
+    const minLength = 8;
+    const hasUpperCase = /[A-Z]/.test(password);
+    const hasLowerCase = /[a-z]/.test(password);
+    const hasNumbers = /\d/.test(password);
+    const hasSpecialChar = /[!@#$%^&*(),.?":{}|<>]/.test(password);
+
+    if (password.length < minLength) {
+      throw new Error('Password must be at least 8 characters long');
+    }
+    if (!hasUpperCase) {
+      throw new Error('Password must contain at least one uppercase letter');
+    }
+    if (!hasLowerCase) {
+      throw new Error('Password must contain at least one lowercase letter');
+    }
+    if (!hasNumbers) {
+      throw new Error('Password must contain at least one number');
+    }
+    if (!hasSpecialChar) {
+      throw new Error('Password must contain at least one special character');
+    }
+  }
+
+  async logSecurityEvent(eventType, userId = null, details = null) {
+    // Log to Firestore for audit trail
+    const securityLog = {
+      eventType,
+      userId,
+      timestamp: new Date(),
+      userAgent: navigator.userAgent,
+      ipAddress: await this.getClientIP(),
+      details
+    };
+
+    // In a real app, you'd write this to Firestore
+    console.log('Security Event:', securityLog);
+  }
+
+  async getClientIP() {
+    // This would typically be handled by a cloud function
+    // that can see the real IP address
+    return 'client-ip-not-available-in-client';
+  }
+}
+
+export default FirebaseAuthSecurity;
+```
+
+## 5. Firebase App Check Implementation
+
+```javascript
+// firebase-app-check.js
+import { initializeAppCheck, ReCaptchaV3Provider } from 'firebase/app-check';
+
+const appCheck = initializeAppCheck(app, {
+  provider: new ReCaptchaV3Provider('your-recaptcha-v3-site-key'),
+  isTokenAutoRefreshEnabled: true
+});
+```
+
+## 6. Firebase Security Functions
+
+### Cloud Functions for Security
+```javascript
+// functions/security.js
+const functions = require('firebase-functions');
+const admin = require('firebase-admin');
+admin.initializeApp();
+
+// Security: Monitor for suspicious activities
+exports.monitorSuspiciousActivities = functions.firestore
+  .document('audit/{auditId}')
+  .onCreate(async (snapshot, context) => {
+    const auditData = snapshot.data();
+    
+    // Check for multiple failed logins
+    if (auditData.eventType === 'login_failed') {
+      const oneHourAgo = new Date(Date.now() - 60 * 60 * 1000);
+      
+      const failedLogins = await admin.firestore()
+        .collection('audit')
+        .where('eventType', '==', 'login_failed')
+        .where('timestamp', '>', oneHourAgo)
+        .where('userId', '==', auditData.userId)
+        .get();
+      
+      if (failedLogins.size > 5) {
+        // Suspend account or send alert
+        await admin.firestore()
+          .collection('security_alerts')
+          .add({
+            type: 'suspicious_login_attempts',
+            userId: auditData.userId,
+            count: failedLogins.size,
+            timestamp: new Date()
+          });
+      }
+    }
+  });
+
+// Security: Clean up old audit logs
+exports.cleanupOldLogs = functions.pubsub
+  .schedule('every 24 hours')
+  .onRun(async (context) => {
+    const thirtyDaysAgo = new Date(Date.now() - 30 * 24 * 60 * 60 * 1000);
+    
+    const oldLogs = await admin.firestore()
+      .collection('audit')
+      .where('timestamp', '<', thirtyDaysAgo)
+      .get();
+    
+    const batch = admin.firestore().batch();
+    oldLogs.docs.forEach(doc => {
+      batch.delete(doc.ref);
+    });
+    
+    await batch.commit();
+    console.log(`Cleaned up ${oldLogs.size} old audit logs`);
+  });
+```
+
+## 7. Environment Security Configuration
+
+### `.env` file
+```env
+# Firebase Configuration
+REACT_APP_FIREBASE_API_KEY=your_api_key_here
+REACT_APP_FIREBASE_AUTH_DOMAIN=your-project.firebaseapp.com
+REACT_APP_FIREBASE_PROJECT_ID=your-project-id
+REACT_APP_FIREBASE_STORAGE_BUCKET=your-project.appspot.com
+REACT_APP_FIREBASE_MESSAGING_SENDER_ID=your_sender_id
+REACT_APP_FIREBASE_APP_ID=your_app_id
+
+# Security
+REACT_APP_RECAPTCHA_SITE_KEY=your_recaptcha_site_key
+REACT_APP_SECURITY_LOG_RETENTION_DAYS=30
+```
+
+## 8. Security Best Practices Implementation
+
+```javascript
+// security-best-practices.js
+export class SecurityBestPractices {
+  static async validateFileUpload(file) {
+    // Check file size (max 5MB)
+    const maxSize = 5 * 1024 * 1024;
+    if (file.size > maxSize) {
+      throw new Error('File size too large. Maximum 5MB allowed.');
+    }
+
+    // Check file type
+    const allowedTypes = ['image/jpeg', 'image/png', 'image/gif', 'application/pdf'];
+    if (!allowedTypes.includes(file.type)) {
+      throw new Error('File type not allowed.');
+    }
+
+    // Check for potential malicious files
+    if (file.name.includes('..') || file.name.includes('/')) {
+      throw new Error('Invalid file name.');
+    }
+  }
+
+  static sanitizeUserInput(input) {
+    // Basic XSS prevention
+    return input
+      .replace(/</g, '&lt;')
+      .replace(/>/g, '&gt;')
+      .replace(/"/g, '&quot;')
+      .replace(/'/g, '&#x27;')
+      .replace(/\//g, '&#x2F;');
+  }
+
+  static validateEmail(email) {
+    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+    return emailRegex.test(email);
+  }
+
+  static generateSecureToken(length = 32) {
+    const array = new Uint8Array(length);
+    crypto.getRandomValues(array);
+    return Array.from(array, byte => byte.toString(16).padStart(2, '0')).join('');
+  }
+}
+```
+
+## 9. Usage Example
+
+```javascript
+// app.js
+import FirebaseAuthSecurity from './firebase-auth-security';
+import { SecurityBestPractices } from './security-best-practices';
+
+const authSecurity = new FirebaseAuthSecurity();
+
+// Secure user registration
+async function registerUser(email, password, displayName) {
+  try {
+    await SecurityBestPractices.validateEmail(email);
+    const userCredential = await authSecurity.secureSignUp(email, password, displayName);
+    console.log('User registered securely:', userCredential.user.uid);
+  } catch (error) {
+    console.error('Registration failed:', error.message);
+  }
+}
+
+// Secure file upload
+async function uploadFile(file, userId) {
+  try {
+    await SecurityBestPractices.validateFileUpload(file);
+    // Proceed with Firebase Storage upload
+  } catch (error) {
+    console.error('File upload rejected:', error.message);
+  }
+}
+```
+
+This comprehensive Firebase security implementation provides:
+
+- ✅ **Firestore Security Rules** with role-based access
+- ✅ **Storage Security Rules** with user isolation
+- ✅ **Authentication Security** with email verification and session management
+- ✅ **App Check** for API protection
+- ✅ **Security Monitoring** with audit trails
+- ✅ **Input Validation** and sanitization
+- ✅ **File Upload Security** with type and size validation
+- ✅ **Security Headers** for web hosting
+
+The implementation follows Firebase security best practices and provides multiple layers of protection for your application.