CodeRabbit Code Review

# CodeRabbit Code Review Report: User Authentication Module

**Project:** SecurePay API | **Language:** Python | **Review Triggered:** Manual
**Reviewed by:** CodeRabbit AI | **Date:** 2023-11-15

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## 🔴 Critical Issues (2)

### 1. [auth.py:42] SQL Injection Vulnerability
**Severity:** Critical
**Description:** User input from `request.json['username']` is directly interpolated into SQL query without sanitization.
```python
query = f"SELECT * FROM users WHERE username = '{username}'"  # UNSAFE
```
**Impact:** Allows attackers to execute arbitrary SQL commands.
**Fix:** Use parameterized queries:
```python
query = "SELECT * FROM users WHERE username = %s"
cursor.execute(query, (username,))
```

### 2. [auth.py:89] Hardcoded API Key
**Severity:** Critical
**Description:** Stripe API key is hardcoded in production code.
```python
STRIPE_KEY = "sk_test_51ABC123..."  # Never hardcode secrets!
```
**Impact:** Exposes sensitive credentials if code is leaked.
**Fix:** Use environment variables:
```python
import os
STRIPE_KEY = os.getenv("STRIPE_SECRET_KEY")
```

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## ⚠️ High Issues (3)

### 3. [auth.py:112] Missing Password Hashing
**Severity:** High
**Description:** User passwords are stored in plaintext.
```python
password = request.json['password']  # Never store plaintext passwords!
```
**Impact:** Compromised database = all user accounts exposed.
**Fix:** Use bcrypt:
```python
import bcrypt
hashed_password = bcrypt.hashpw(password.encode(), bcrypt.gensalt())
```

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## 📊 Code Quality Metrics

| Metric               | Current | Target | Status      |
|----------------------|---------|--------|-------------|
| Cyclomatic Complexity| 18      | < 10   | Needs Refactor |
| Test Coverage        | 45%     | 80%+  | Inadequate  |
| Duplicated Code      | 12%     | < 5%   | Needs Cleanup |

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## 🔧 Recommended Actions

1. **Immediate:** Apply fixes for Critical issues (Priority: P0)
2. **This Sprint:** Address High issues and refactor auth.py to reduce complexity
3. **Next Sprint:** Add unit tests (target: 80% coverage) and implement CI/CD pipeline with automated security scanning

**Total Issues Found:** 8 | **Critical:** 2 | **High:** 3 | **Medium:** 2 | **Low:** 1

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*Generated by CodeRabbit AI | Next review recommended in 2 weeks or after major changes.*