Implemented Google Authentication using firebase

.github/copilot-instructions.md

@@ -0,0 +1,100 @@
+# Splitwiser - AI Coding Guide
+
+This document provides essential context for AI assistants working with the Splitwiser codebase.
+
+## Project Overview
+
+Splitwiser is an expense tracking and splitting application with:
+- Backend: FastAPI + MongoDB 
+- Frontend POC: Streamlit
+- Frontend: Expo/React Native (implemented with Google/Firebase authentication)
+
+The app allows users to create groups, add expenses with flexible splitting options, track balances, and handle settlements.
+
+## Architecture
+
+### Backend (FastAPI)
+- Located in `/backend/`
+- RESTful API using FastAPI with Python 3.9+
+- MongoDB for database (nonrelational schema)
+- JWT authentication with refresh token rotation
+- Modular design with services:
+  - `app/auth/`: Authentication & user registration
+  - `app/user/`: User profile management
+  - `app/groups/`: Group creation & management
+  - `app/expenses/`: Expense tracking & splitting
+
+### Frontend POC (Streamlit)
+- Located in `/ui-poc/`
+- `Home.py`: Entry point with login/registration
+- `pages/`: Contains main application pages
+  - `Groups.py`: Group management & expense creation 
+  - `Friends.py`: Friend balance tracking
+
+## Key Development Patterns
+
+### API Communication
+```python
+# Example API call with retry logic from Groups.py
+response = make_api_request(
+    method="get",
+    url=f"{API_URL}/groups/{group_id}",
+    headers={"Authorization": f"Bearer {st.session_state.access_token}"},
+    max_retries=3
+)
+```
+
+### State Management
+- Backend: MongoDB stores persistent data
+- Frontend: Streamlit session state manages user session
+```python
+# Session state initialization (see Home.py)
+if "access_token" not in st.session_state:
+    st.session_state.access_token = None
+```
+
+### Expense Handling
+- Support for different split types: equal, unequal, percentage-based
+- Each expense has a payer and multiple splits (recipients)
+- Settlements track debt resolution between users
+
+## Developer Workflows
+
+### Setup & Running
+1. Backend: 
+   ```bash
+   cd backend
+   pip install -r requirements.txt
+   uvicorn main:app --reload
+   ```
+2. Frontend POC:
+   ```bash
+   cd ui-poc
+   pip install -r requirements.txt
+   streamlit run Home.py
+   ```
+3. Test Data Generation:
+   ```bash
+   cd ui-poc
+   python setup_test_data.py
+   ```
+
+### Testing
+- Backend tests in `/backend/tests/`
+- Run tests with: `cd backend && pytest`
+- Test data setup script: `/ui-poc/setup_test_data.py`
+
+## Critical Files & Dependencies
+
+- `backend/main.py`: Main FastAPI application entry point
+- `backend/app/config.py`: Configuration settings
+- `backend/app/database.py`: MongoDB connection
+- `ui-poc/Home.py`: Streamlit application entry point
+- `ui-poc/openapi.json`: API specification for frontend reference
+
+## Common Tasks
+
+- Adding new API endpoint: Add route to appropriate service router file
+- Adding new UI component: Modify files in `/ui-poc/pages/`
+- Testing data flow: Use the `setup_test_data.py` to create test scenarios
+- Troubleshooting auth: Check JWT token handling in `app/auth/security.py`

.gitignore

@@ -24,6 +24,7 @@ node_modules/
 dist/
 web-build/
 expo-env.d.ts
+eas.json
 
 # Native
 .kotlin/

backend/.env.example

@@ -10,7 +10,7 @@ REFRESH_TOKEN_EXPIRE_DAYS=30
 # Firebase Config
 FIREBASE_PROJECT_ID=your-firebase-project-id
 FIREBASE_SERVICE_ACCOUNT_PATH=./firebase-service-account.json
-
+FIREBASE_CREDENTIALS_PATH=./firebase-credentials.json
 # CORS Configuration
 ALLOWED_ORIGINS=http://localhost:3000,http://localhost:5173,http://127.0.0.1:3000,http://127.0.0.1:5173
 ALLOW_ALL_ORIGINS=False

backend/app/firebase_config.py

@@ -0,0 +1,24 @@
+import firebase_admin
+from firebase_admin import credentials, auth
+
+def initialize_firebase():
+    """Initialize Firebase Admin SDK with proper error handling."""
+    try:
+        # Use environment variable or fallback to relative path
+        credentials_path = os.getenv(
+            'FIREBASE_CREDENTIALS_PATH', 
+            '../firebase_service_account.json'
+        )
+
+        if not Path(credentials_path).exists():
+            raise FileNotFoundError(f"Firebase credentials file not found: {credentials_path}")
+
+        cred = credentials.Certificate(credentials_path)
+        firebase_admin.initialize_app(cred)
+        print("Firebase Admin SDK initialized successfully")
+    except Exception as e:
+        print(f"Failed to initialize Firebase Admin SDK: {e}")
+        raise
+
+# Initialize Firebase
+initialize_firebase()

backend/requirements.txt

@@ -1,4 +1,4 @@
-fastapi==0.115.12
+fastapi==0.116.1
 uvicorn[standard]==0.34.3
 python-jose[cryptography]==3.5.0
 passlib[bcrypt]==1.7.4

frontend/app.json

@@ -16,17 +16,41 @@
       "**/*"
     ],
     "ios": {
-      "supportsTablet": true
-    },    "android": {
+      "supportsTablet": true,
+      "bundleIdentifier": "splitwiser.app",
+      "infoPlist": {
+        "ITSAppUsesNonExemptEncryption": false
+      }
+    },
+    "android": {
       "adaptiveIcon": {
         "foregroundImage": "./assets/adaptive-icon.png",
         "backgroundColor": "#ffffff"
       },
       "googleServicesFile": "./google-services.json",
-      "package": "splitwiser.app"
+      "package": "com.splitwiser.app"
     },
     "web": {
       "favicon": "./assets/favicon.png"
+    },
+    "plugins": [
+      [
+        "expo-build-properties",
+        {
+          "android": {
+            "compileSdkVersion": 34,
+            "targetSdkVersion": 34
+          },
+          "ios": {
+            "deploymentTarget": "13.0"
+          }
+        }
+      ]
+    ],
+    "extra": {
+      "eas": {
+        "projectId": "7d966fbc-616f-44d2-974f-36d61a2f9ae7"
+      }
     }
   }
 }

frontend/babel.config.js

@@ -0,0 +1,8 @@
+        // babel.config.js
+        module.exports = function(api) {
+          api.cache(true);
+          return {
+            presets: ['babel-preset-expo'],
+            plugins: ['module:react-native-dotenv'] // Add this line
+          };
+        };