# Trust Gateway: The Middleware Gap Solution

## The Problem

### The Naive Approach:
"Let's use a startup's API that auto-routes our traffic to the cheapest model."

### The Engineering Reality:
No Enterprise CISO (Chief Information Security Officer) will send their proprietary data to a random middleware startup just to save 30% on tokens. **The risk of data leakage is too high.**

This layer—the "Model Gateway"—is critical, but it requires **massive trust**.

## The Opportunity

There is a gap here, but it's not for a SaaS. **It's for Infrastructure.**

### The Big Players:
Microsoft (Azure AI Gateway) and Google will likely dominate this because they own the pipe.

### The Startup Play:
**Don't build a SaaS Router. Build an On-Prem / Private Cloud Router.**

The winner won't be the one with the smartest routing algorithm; **it will be the one the Enterprise trusts with the keys to the kingdom.**

## The Solution: Trust Gateway

Context-as-a-Service provides an **enterprise-grade Trust Gateway** that can be deployed within your own infrastructure, addressing CISO concerns while maintaining intelligent routing capabilities.

### Key Principles

1. **Data Never Leaves Your Infrastructure** - Deploy on-premises or in your private cloud
2. **Zero Third-Party Risk** - No data sent to external middleware services
3. **Full Audit Trail** - Complete visibility for compliance and security
4. **Configurable Security** - Match your organization's security requirements
5. **Battle-Tested Routing** - Uses proven heuristic routing (Speed > Smarts)

## Architecture

```
┌─────────────────────────────────────────────────────────┐
│         YOUR INFRASTRUCTURE (On-Prem / Private Cloud)   │
│                                                          │
│  ┌────────────────────────────────────────────────┐    │
│  │           Trust Gateway                         │    │
│  │  ┌──────────────────────────────────────────┐  │    │
│  │  │  Security Policy Engine                  │  │    │
│  │  │  - Authentication & Authorization        │  │    │
│  │  │  - Data Classification                   │  │    │
│  │  │  - Encryption Controls                   │  │    │
│  │  └──────────────────────────────────────────┘  │    │
│  │  ┌──────────────────────────────────────────┐  │    │
│  │  │  Heuristic Router                        │  │    │
│  │  │  - 0ms routing decisions                 │  │    │
│  │  │  - Deterministic rules                   │  │    │
│  │  │  - No external AI calls                  │  │    │
│  │  └──────────────────────────────────────────┘  │    │
│  │  ┌──────────────────────────────────────────┐  │    │
│  │  │  Audit & Compliance Logger               │  │    │
│  │  │  - Full request tracking                 │  │    │
│  │  │  - Compliance reporting                  │  │    │
│  │  │  - Data retention policies               │  │    │
│  │  └──────────────────────────────────────────┘  │    │
│  └────────────────────────────────────────────────┘    │
│                          │                              │
│                          ▼                              │
│  ┌────────────────────────────────────────────────┐    │
│  │     Your Internal AI Models                    │    │
│  │     (GPT, Claude, LLaMA, etc.)                 │    │
│  └────────────────────────────────────────────────┘    │
│                                                          │
└─────────────────────────────────────────────────────────┘

NO DATA LEAVES YOUR INFRASTRUCTURE
```

## Deployment Modes

### 1. On-Premises (`on_prem`)
Deploy Trust Gateway directly on your own servers.

**Use Case:** Maximum control and security  
**Best For:** Financial institutions, Healthcare, Government  
**Data Flow:** All data stays within your data center

```python
from caas.gateway import TrustGateway, SecurityPolicy, DeploymentMode

policy = SecurityPolicy(
    deployment_mode=DeploymentMode.ON_PREM,
    security_level="maximum"
)

gateway = TrustGateway(security_policy=policy)
```

### 2. Private Cloud (`private_cloud`)
Deploy in your private cloud environment (AWS VPC, Azure VNet, GCP VPC).

**Use Case:** Cloud-native with isolated network  
**Best For:** Enterprise cloud adopters  
**Data Flow:** Data stays within your VPC/VNet

```python
policy = SecurityPolicy(
    deployment_mode=DeploymentMode.PRIVATE_CLOUD,
    security_level="high"
)

gateway = TrustGateway(security_policy=policy)
```

### 3. Hybrid (`hybrid`)
Local processing with cloud backup capabilities.

**Use Case:** Disaster recovery and failover  
**Best For:** Organizations with hybrid infrastructure  
**Data Flow:** Primary processing local, encrypted backup to cloud

```python
policy = SecurityPolicy(
    deployment_mode=DeploymentMode.HYBRID,
    security_level="high"
)

gateway = TrustGateway(security_policy=policy)
```

### 4. Air-Gapped (`air_gapped`)
Completely isolated from the internet.

**Use Case:** Maximum security, zero external connectivity  
**Best For:** Defense, Critical infrastructure  
**Data Flow:** No external connectivity whatsoever

```python
policy = SecurityPolicy(
    deployment_mode=DeploymentMode.AIR_GAPPED,
    security_level="maximum",
    data_retention=DataRetentionPolicy(
        retain_requests=False,
        retention_days=0,
        auto_delete=True
    )
)

gateway = TrustGateway(security_policy=policy)
```

## Security Features

### 1. Authentication & Authorization

```python
policy = SecurityPolicy(
    require_authentication=True,
    allowed_users=["user1", "user2", "admin"],
    allowed_ip_ranges=["10.0.0.0/8", "192.168.0.0/16"]
)
```

### 2. Data Classification

Enforce data classification for compliance:

```python
policy = SecurityPolicy(
    data_classification_required=True,
    allowed_classifications=["public", "internal", "confidential", "secret"]
)

# Route request with classification
result = gateway.route_request(
    query="Analyze Q3 financials",
    user_id="analyst@company.com",
    data_classification="confidential"
)
```

### 3. Encryption

```python
policy = SecurityPolicy(
    encrypt_in_transit=True,   # Require TLS/HTTPS
    encrypt_at_rest=True,      # Encrypt stored data
)
```

### 4. Data Retention Policies

```python
from caas.gateway import DataRetentionPolicy

retention = DataRetentionPolicy(
    retain_requests=True,
    retention_days=90,          # Keep for 90 days
    auto_delete=True,           # Auto-delete after 90 days
    encrypt_at_rest=True,       # Encrypt stored data
    pii_scrubbing=True          # Scrub PII from logs
)

policy = SecurityPolicy(data_retention=retention)
```

### 5. Audit & Compliance

Full audit trail for regulatory compliance:

```python
policy = SecurityPolicy(
    audit_all_requests=True,
    audit_data_access=True,
    compliance_mode="GDPR"  # or "HIPAA", "SOC2", etc.
)

gateway = TrustGateway(security_policy=policy, audit_enabled=True)

# Get audit logs
logs = gateway.get_audit_logs(
    event_type="request_routed",
    start_time="2024-01-01T00:00:00"
)
```

## Usage Examples

### Basic Usage

```python
from caas.gateway import TrustGateway, SecurityPolicy, DeploymentMode

# Create gateway with enterprise security
policy = SecurityPolicy(
    deployment_mode=DeploymentMode.ON_PREM,
    security_level="high",
    require_authentication=True
)

gateway = TrustGateway(security_policy=policy)

# Route request through gateway
result = gateway.route_request(
    query="Summarize this document",
    user_id="john@company.com",
    data_classification="internal"
)

print(result)
```

**Output:**
```json
{
  "status": "approved",
  "request_id": "abc-123-def-456",
  "routing_decision": {
    "model_tier": "smart",
    "suggested_model": "gpt-4o",
    "estimated_cost": "high",
    "reason": "Complex task keywords detected: summarize"
  },
  "security_context": {
    "deployment_mode": "on_prem",
    "security_level": "high",
    "data_classification": "internal",
    "encrypted": true,
    "audited": true
  }
}
```

### Request Validation

```python
# Validate request against security policy
validation = gateway.validate_request(
    request_data={"query": "Analyze sales data"},
    user_id="analyst@company.com",
    data_classification="confidential"
)

if validation["valid"]:
    print("Request approved")
else:
    print("Violations:", validation["violations"])
```

### Audit Logs

```python
# Get all audit logs
all_logs = gateway.get_audit_logs()

# Filter by event type
routing_logs = gateway.get_audit_logs(event_type="request_routed")

# Filter by user
user_logs = gateway.get_audit_logs(user_id="admin@company.com")

# Filter by time range
recent_logs = gateway.get_audit_logs(
    start_time="2024-01-01T00:00:00",
    end_time="2024-01-31T23:59:59"
)
```

### Deployment Information

```python
# Get deployment info
info = gateway.get_deployment_info()

print(f"Deployment Mode: {info['deployment_mode']}")
print(f"Security Level: {info['security_level']}")
print(f"Total Audit Logs: {info['total_audit_logs']}")
print("\nTrust Guarantees:")
for guarantee in info['trust_guarantees']:
    print(f"  ✅ {guarantee}")
```

## API Integration

The Trust Gateway integrates seamlessly with the existing Context-as-a-Service API:

```bash
# Route through Trust Gateway with security context
curl -X POST "http://localhost:8000/gateway/route" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer <token>" \
  -d '{
    "query": "Analyze Q3 financials",
    "user_id": "analyst@company.com",
    "data_classification": "confidential"
  }'
```

## Comparison: SaaS vs Trust Gateway

| Feature | SaaS Router | Trust Gateway |
|---------|-------------|---------------|
| **Deployment** | External service | Your infrastructure |
| **Data Location** | Third-party servers | Your servers only |
| **Data Security** | ⚠️ Third-party trust required | ✅ Complete control |
| **CISO Approval** | ❌ Difficult (data leakage risk) | ✅ Easy (zero external data) |
| **Compliance** | ⚠️ Depends on provider | ✅ Your controls |
| **Audit Trail** | ⚠️ Limited visibility | ✅ Full transparency |
| **Cost Savings** | 30% token savings | 30% token savings |
| **Latency** | +500ms (external API) | 0ms (local routing) |
| **Trust** | ⚠️ Requires third-party trust | ✅ Self-hosted trust |

## Why Trust Gateway Wins

### 1. **Zero Data Leakage**
Your proprietary data never leaves your infrastructure. This is the #1 CISO concern.

### 2. **No External Dependencies**
Heuristic routing runs locally with 0ms decisions. No external AI classifier needed.

### 3. **Full Audit Trail**
Every request, routing decision, and data access is logged for compliance.

### 4. **Battle-Tested Routing**
Uses the same proven heuristic router as the main service (Speed > Smarts).

### 5. **Enterprise Controls**
Authentication, authorization, data classification, encryption - all configurable.

### 6. **Deployment Flexibility**
Works on-prem, private cloud, hybrid, or air-gapped environments.

## Compliance & Certifications

Trust Gateway is designed to support:

- **GDPR** - Data retention, right to deletion, audit trails
- **HIPAA** - Encryption, access controls, audit logging
- **SOC 2** - Security controls, change management, monitoring
- **ISO 27001** - Information security management
- **FedRAMP** - Federal security requirements

Configure compliance mode:

```python
policy = SecurityPolicy(compliance_mode="HIPAA")
```

## Comparison with Big Players

### Microsoft Azure AI Gateway
- ✅ Trust from Microsoft brand
- ❌ Vendor lock-in to Azure
- ❌ Data still in Microsoft's cloud

### Google Vertex AI
- ✅ Trust from Google brand
- ❌ Vendor lock-in to GCP
- ❌ Data still in Google's cloud

### Context-as-a-Service Trust Gateway
- ✅ Zero vendor lock-in
- ✅ Deploy anywhere (on-prem, any cloud, air-gapped)
- ✅ Data never leaves YOUR infrastructure
- ✅ Open source transparency

## Cost Analysis

### SaaS Router Approach (External Service)

```
Monthly Cost:
- External routing service: $500/month
- Data egress fees: $200/month
- Third-party security audit: $1,000/month
- Risk of data breach: Priceless

Total: $1,700/month + breach risk
```

### Trust Gateway Approach (Self-Hosted)

```
Monthly Cost:
- Server resources: $100/month (marginal)
- No external service fees: $0
- No data egress: $0
- No third-party risk: $0
- Peace of mind: Priceless

Total: $100/month + full control
```

**Annual Savings: $19,200 + eliminated security risk**

## Getting Started

### Installation

```bash
pip install -r requirements.txt
```

### Quick Start

```python
from caas.gateway import TrustGateway, SecurityPolicy, DeploymentMode

# Create Trust Gateway
policy = SecurityPolicy(deployment_mode=DeploymentMode.ON_PREM)
gateway = TrustGateway(security_policy=policy)

# Route request
result = gateway.route_request(
    query="What is Python?",
    user_id="developer@company.com"
)

print(result)
```

### Production Deployment

For production deployment with full security:

```python
from caas.gateway import (
    TrustGateway, 
    SecurityPolicy, 
    DeploymentMode,
    SecurityLevel,
    DataRetentionPolicy
)

# Configure production security policy
retention = DataRetentionPolicy(
    retain_requests=True,
    retention_days=90,
    auto_delete=True,
    encrypt_at_rest=True,
    pii_scrubbing=True
)

policy = SecurityPolicy(
    deployment_mode=DeploymentMode.PRIVATE_CLOUD,
    security_level=SecurityLevel.MAXIMUM,
    data_retention=retention,
    require_authentication=True,
    allowed_users=["admin@company.com"],
    data_classification_required=True,
    encrypt_in_transit=True,
    encrypt_at_rest=True,
    audit_all_requests=True,
    compliance_mode="SOC2"
)

gateway = TrustGateway(security_policy=policy, audit_enabled=True)
```

## Best Practices

### 1. Start with Maximum Security
Begin with the highest security level and relax as needed:

```python
policy = SecurityPolicy(
    deployment_mode=DeploymentMode.AIR_GAPPED,
    security_level=SecurityLevel.MAXIMUM
)
```

### 2. Enable Audit Logging
Always enable audit logging for compliance:

```python
gateway = TrustGateway(security_policy=policy, audit_enabled=True)
```

### 3. Classify Your Data
Implement data classification from day one:

```python
result = gateway.route_request(
    query=query,
    data_classification="confidential"  # Always specify
)
```

### 4. Regular Audit Reviews
Review audit logs regularly:

```python
# Weekly audit review
logs = gateway.get_audit_logs(
    start_time=(datetime.now() - timedelta(days=7)).isoformat()
)
```

### 5. Test Security Policies
Test your security policies before production:

```python
validation = gateway.validate_request(
    request_data={"query": "test"},
    user_id="test@company.com",
    data_classification="public"
)

assert validation["valid"], validation["violations"]
```

## Roadmap

Future enhancements for Trust Gateway:

- [ ] Multi-tenancy support
- [ ] Role-based access control (RBAC)
- [ ] Integration with enterprise SSO (SAML, OAuth)
- [ ] Advanced threat detection
- [ ] Automated compliance reporting
- [ ] Kubernetes deployment templates
- [ ] Docker container images
- [ ] Terraform modules for infrastructure as code

## Support

For enterprise support, deployment assistance, or questions:

- GitHub Issues: [context-as-a-service/issues](https://github.com/imran-siddique/context-as-a-service/issues)
- Email: enterprise-support@contextasaservice.com

## License

MIT License - see LICENSE file for details.

---

**Trust Gateway** - The middleware solution enterprises can trust with the keys to the kingdom.
