LibreChat

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Real Null 26a58fcabc 🚨 fix: Redis CA file handling (#9692 )

* 🚨 fix: Critical Redis CA file handling bug that could crash app

🔧 Added safe error handling for Redis CA certificate file reading in cacheConfig.js

## 🐛 Problem
- fs.readFileSync() was called directly without error handling
- Missing or inaccessible REDIS_CA files would throw unhandled exceptions
- 💥 Application would crash during startup with cryptic filesystem errors
- ❌ No validation of file existence before attempting to read

## ✅ Solution
- ➕ Added getRedisCA() helper function with comprehensive error handling
- 🔍 Implemented fs.existsSync() check before file reading attempts
- 🛡️ Added try-catch block to handle filesystem errors gracefully
- 📝 Added informative warning/error logging for troubleshooting
- 🔄 Function returns null safely on any error condition

## 🎯 Benefits
- 🚫 Prevents application crashes from misconfigured CA certificate paths
- 🔍 Provides clear error messages for debugging certificate issues
- ✅ Maintains backward compatibility for valid certificate configurations
- 🚀 Improves production stability and deployment reliability

## 🧪 Testing Results
- ✅ Verified handling of missing REDIS_CA environment variable
- ✅ Tested with non-existent file paths (returns null with warning)
- ✅ Confirmed valid certificate files are read correctly
- ✅ Validated error handling for permission/access issues

🎉 This fix ensures LibreChat continues running regardless of Redis CA
certificate configuration problems, improving overall system reliability.

🏷️ Type: 🐛 Bug Fix
📊 Impact: 🔴 High (prevents application crashes)
🎯 Area: Cache Configuration, Redis Integration

* chore: Redis CA certificate handling with proper logging + JSDocs

* chore: Improve error logging for Redis CA certificate file read failure

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Co-authored-by: Danny Avila <danny@librechat.ai>