### Run Basic Scan Example

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Execute the basic scan example using Cargo. This demonstrates the fundamental scanning functionality.

```bash
# Basic scanning
cargo run --example basic_scan
```

--------------------------------

### Run Custom Backend Example

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Execute the custom backend implementation example using Cargo. This is useful for demonstrating custom scanner integrations.

```bash
# Custom backend implementation
cargo run --example custom_backend
```

--------------------------------

### Run Circuit Breaker Example

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Execute the circuit breaker demonstration example using Cargo. This showcases how the circuit breaker pattern is applied.

```bash
# Circuit breaker demonstration
cargo run --example with_circuit_breaker
```

--------------------------------

### Create Backend Module

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Create a new Rust file for the backend module. This example creates 'src/backends/threat_intel.rs'.

```rust
#[cfg(feature = "threat-intel")]
pub mod threat_intel;

#[cfg(feature = "threat-intel")]
pub use threat_intel::ThreatIntelScanner;

```

--------------------------------

### Basic Scanbridge Usage with MockScanner

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Demonstrates how to initialize Scanbridge with a mock scanner, build a scan manager, and perform a scan on a file. This example shows how to check if a file is clean or infected.

```rust
use scanbridge::prelude::*;
use scanbridge::backends::MockScanner;

#[tokio::main] async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Create a scanner
    let scanner = MockScanner::new_clean();
    
    // Build the scan manager
    let manager = ScanManager::builder()
        .add_scanner(scanner)
        .build()?;
    
    // Scan a file
    let input = FileInput::from_bytes(b"file content".to_vec());
    let context = ScanContext::new().with_tenant_id("my-tenant");
    let report = manager.scan(input, context).await?;
    
    if report.is_clean() {
        println!("File is clean!");
    } else if report.is_infected() {
        println!("Threats detected: {:?}", report.all_threats());
    }
    
    Ok(())
}
```

--------------------------------

### Configure Log Rotation

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Example configuration for daily log rotation, keeping 365 days of compressed logs. Ensure logs are not rotated if empty.

```bash
# Example log rotation config
/var/log/scanbridge/audit.json {
    daily
    rotate 365
    compress
    notifempty
    missingok
}
```

--------------------------------

### Policy Rule for FailOpen Source

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Example of a policy rule to block files when the circuit breaker is in FailOpen mode and the source is 'failopen'.

```rust
PolicyRule::new("block-fallback", PolicyAction::require_review())
    .with_condition(Condition::SourceEquals { source: "failopen".into() })
```

--------------------------------

### Implement Custom S3 Quarantine Storage Backend

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Example implementation of the `QuarantineStore` trait for storing quarantine records in AWS S3. This includes methods for storing, retrieving, deleting, and listing records.

```rust
use scanbridge::quarantine::{QuarantineStore, QuarantineRecord, QuarantineId, QuarantineFilter};
use scanbridge::core::{FileInput, QuarantineError};
use async_trait::async_trait;

#[derive(Debug)]
pub struct S3QuarantineStore {
    bucket: String,
    client: aws_sdk_s3::Client,
}

#[async_trait]
impl QuarantineStore for S3QuarantineStore {
    async fn store(
        &self,
        input: &FileInput,
        record: QuarantineRecord,
    ) -> Result<QuarantineId, QuarantineError> {
        // Upload to S3 with metadata
        todo!()
    }

    async fn retrieve(
        &self,
        id: &QuarantineId,
    ) -> Result<(Vec<u8>, QuarantineRecord), QuarantineError> {
        // Download from S3
        todo!()
    }

    async fn delete(&self, id: &QuarantineId) -> Result<(), QuarantineError> {
        // Delete from S3
        todo!()
    }

    async fn list(
        &self,
        filter: QuarantineFilter,
    ) -> Result<Vec<QuarantineRecord>, QuarantineError> {
        // Query DynamoDB/metadata store
        todo!()
    }
}
```

--------------------------------

### Integrate FilesystemQuarantine with ScanManager

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Configures ScanManager to use FilesystemQuarantine for storing quarantined files. This setup automatically handles file storage and audit events when a scan policy dictates quarantine.

```rust
use scanbridge::quarantine::FilesystemQuarantine;

let quarantine = FilesystemQuarantine::new("/var/quarantine")?;

let manager = ScanManager::builder()
    .add_scanner(scanner)
    .with_quarantine(quarantine)
    .build()?;
```

--------------------------------

### Add Feature Flag in Cargo.toml

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Define a new feature flag in Cargo.toml to enable the backend. This example uses 'threat-intel' and depends on the 'reqwest' crate.

```toml
[features]
threat-intel = ["reqwest"]

```

--------------------------------

### Scan Started Event Structure

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

This JSON structure represents an audit log event emitted when a scan begins. It includes identifiers for the scan, tenant, user, and source.

```json
{
  "event_type": "scan_started",
  "scan_id": "550e8400-e29b-41d4-a716-446655440000",
  "file_hash_blake3": "abc123...",
  "tenant_id": "customer-123",
  "user_id": "user-456",
  "source": "upload"
}
```

--------------------------------

### Perform Periodic Cleanup of Expired Quarantine

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Execute a cleanup operation to remove expired quarantine records. This function should be run periodically, for example, as a daily cron job.

```rust
// Run periodically (e.g., daily cron job)
let deleted = quarantine.cleanup_expired().await?;
tracing::info!(deleted = deleted, "Quarantine cleanup complete");
```

--------------------------------

### Create FilesystemQuarantine Storage

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Initializes a new FilesystemQuarantine instance. Ensure the specified directory exists and has appropriate permissions.

```rust
use scanbridge::quarantine::FilesystemQuarantine;

// Create quarantine storage
let quarantine = FilesystemQuarantine::new("/var/lib/scanbridge/quarantine")?;
```

--------------------------------

### Initialize Filesystem Quarantine

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Create a FilesystemQuarantine instance to store infected files. Files are stored with integrity verification.

```rust
use scanbridge::quarantine::FilesystemQuarantine;

let quarantine = FilesystemQuarantine::new("/var/quarantine")?;

// Files are stored with integrity verification
// and can be retrieved, listed, or deleted
```

--------------------------------

### Basic Circuit Breaker Usage

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Demonstrates how to initialize and use a circuit breaker to protect a scanner. This snippet shows setting up a mock scanner, configuring the circuit breaker with custom thresholds and durations, and then using the protected scanner.

```rust
use scanbridge::backends::MockScanner;
use scanbridge::circuit_breaker::{CircuitBreaker, CircuitBreakerConfig};
use std::time::Duration;

// Create a scanner
let scanner = MockScanner::new_clean();

// Configure the circuit breaker
let config = CircuitBreakerConfig::default()
    .with_failure_threshold(5)
    .with_open_duration(Duration::from_secs(30))
    .with_success_threshold(3);

// Wrap the scanner
let protected = CircuitBreaker::new(scanner, config);

// Use protected just like a regular scanner
let result = protected.scan(&input).await;
```

--------------------------------

### Basic Stdout Logging

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Initializes simple logging to standard output with INFO level verbosity.

```rust
use tracing_subscriber::fmt;

// Simple stdout logging
tracing_subscriber::fmt()
    .with_max_level(tracing::Level::INFO)
    .init();
```

--------------------------------

### Multiple Log Outputs (File and Console)

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Sets up two distinct logging layers: one for JSON audit logs to a file, and another for general INFO level logs to the console.

```rust
use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
use tracing_subscriber::fmt;

// File output for audit logs
let audit_file = std::fs::File::create("/var/log/scanbridge/audit.json")?;
let audit_layer = fmt::layer()
    .json()
    .with_writer(audit_file)
    .with_filter(tracing_subscriber::filter::filter_fn(|meta| {
        meta.target().starts_with("scanbridge::audit")
    }));

// Console output for everything
let console_layer = fmt::layer()
    .with_filter(tracing::Level::INFO);

tracing_subscriber::registry()
    .with(audit_layer)
    .with(console_layer)
    .init();
```

--------------------------------

### Implement Threat Intel Scanner Helper Methods

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Provides implementations for reading file inputs (path or bytes) and querying a threat intelligence API. It handles API requests, response parsing, and specific error conditions like rate limiting or not found.

```rust
impl ThreatIntelScanner {
    async fn read_file(&self, input: &FileInput) -> Result<Vec<u8>, ScanError> {
        match input {
            FileInput::Path(path) => {
                tokio::fs::read(path)
                    .await
                    .map_err(ScanError::Io)
            }
            FileInput::Bytes { data, .. } => Ok(data.clone()),
            FileInput::Stream { .. } => {
                Err(ScanError::internal("Streaming not supported"))
            }
        }
    }

    async fn query_api(&self, hash: &FileHash) -> Result<ScanOutcome, ScanError> {
        use secrecy::ExposeSecret;

        let sha256 = hash.sha256.as_ref().ok_or_else(|| {
            ScanError::internal("SHA256 required for threat intel API")
        })?;

        let url = format!("{}/lookup/{}", self.config.api_url, sha256);

        let response = self.client
            .get(&url)
            .header("X-API-Key", self.config.api_key.expose_secret())
            .send()
            .await
            .map_err(|e| ScanError::connection_failed(self.name(), e.to_string()))?;

        match response.status() {
            s if s.is_success() => {
                let body: serde_json::Value = response.json().await
                    .map_err(|e| ScanError::AmbiguousResponse {
                        engine: self.name().into(),
                        details: e.to_string(),
                    })?;

                self.parse_response(&body)
            }
            reqwest::StatusCode::NOT_FOUND => {
                // Hash not in database = clean
                Ok(ScanOutcome::Clean)
            }
            reqwest::StatusCode::TOO_MANY_REQUESTS => {
                Err(ScanError::RateLimited {
                    engine: self.name().into(),
                    retry_after: Some(std::time::Duration::from_secs(60)),
                })
            }
            s => {
                Err(ScanError::engine_unavailable(
                    self.name(),
                    format!("API returned {}", s),
                ))
            }
        }
    }

    fn parse_response(&self, json: &serde_json::Value) -> Result<ScanOutcome, ScanError> {
        let is_malicious = json.get("malicious")
            .and_then(|v| v.as_bool())
            .unwrap_or(false);

        if is_malicious {
            let threat_name = json.get("threat_name")
                .and_then(|v| v.as_str())
                .unwrap_or("Unknown");

            let severity = match json.get("severity").and_then(|v| v.as_str()) {
                Some("critical") => ThreatSeverity::Critical,
                Some("high") => ThreatSeverity::High,
                Some("medium") => ThreatSeverity::Medium,
                _ => ThreatSeverity::Low,
            };

            Ok(ScanOutcome::Infected {
                threats: vec![
                    ThreatInfo::new(threat_name, severity, self.name())
                ],
            })
        } else {
            Ok(ScanOutcome::Clean)
        }
    }
}
```

--------------------------------

### Elasticsearch/OpenSearch Logging with Bunyan Format

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Integrates with Elasticsearch or OpenSearch by formatting logs using the Bunyan format and writing them to a rolling daily file.

```rust
use tracing_bunyan_formatter::{BunyanFormattingLayer, JsonStorageLayer};
use tracing_subscriber::Registry;

let app_name = "scanbridge-service";
let (non_blocking, _guard) = tracing_appender::non_blocking(
    tracing_appender::rolling::daily("/var/log/scanbridge", "audit")
);

let bunyan_layer = BunyanFormattingLayer::new(app_name.into(), non_blocking);

Registry::default()
    .with(JsonStorageLayer)
    .with(bunyan_layer)
    .init();
```

--------------------------------

### Fail Open Fallback Behavior

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Configure the circuit breaker to allow files through when the circuit is open. Use with caution as this may allow potentially infected files to pass.

```rust
.with_fallback_behavior(FallbackBehavior::FailOpen)
```

--------------------------------

### Include Context in Scan

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Add tenant, user, request, and source information to the scan context. This is crucial for detailed audit trails.

```rust
let context = ScanContext::new()
    .with_tenant_id(&tenant_id)
    .with_user_id(&user_id)
    .with_request_id(&request_id)
    .with_source("api-upload");
```

--------------------------------

### Quarantine File Recovery Workflow

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

This Rust code demonstrates the workflow for recovering a file determined to be a false positive from quarantine. It includes retrieving, optionally re-scanning, returning the file, deleting from quarantine, and logging the action.

```rust
// 1. Retrieve the file
let (data, record) = quarantine.retrieve(&id).await?;

// 2. Re-scan with updated signatures (optional)
let input = FileInput::from_bytes(data.clone());
let new_result = manager.scan(input, context).await?;

if new_result.is_clean() {
    // 3. Return to user/original location
    tokio::fs::write(&original_path, &data).await?;
    
    // 4. Delete from quarantine
    quarantine.delete(&id).await?;
    
    // 5. Log the recovery
    tracing::info!(
        quarantine_id = %id,
        file_hash = %record.file_hash.blake3,
        "False positive recovered from quarantine"
    );
}
```

--------------------------------

### Add Scanbridge to Cargo.toml

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Include Scanbridge and Tokio as dependencies in your project's Cargo.toml file. Ensure Tokio is configured with the 'full' feature set.

```toml
[dependencies]
scanbridge = "0.1"
tokio = { version = "1", features = ["full"] }
```

--------------------------------

### Configure JSON Audit Logging Subscriber

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Set up a tracing subscriber to output audit events in JSON format. This is useful for compliance logging.

```rust
use tracing_subscriber::fmt::format::FmtSpan;

// Configure a JSON subscriber for compliance logging
tracing_subscriber::fmt()
    .json()
    .with_target(true)
    .init();
```

--------------------------------

### Configure Non-Blocking File Writer for Tracing

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Configure a non-blocking writer for the tracing subscriber to improve audit logging performance in high-volume scenarios. This prevents blocking I/O on the critical path.

```rust
use tracing_appender::non_blocking;

let (non_blocking_writer, _guard) = non_blocking(file);
tracing_subscriber::fmt()
    .with_writer(non_blocking_writer)
    .init();
```

--------------------------------

### Apply Various Filtering Options for Quarantine Records

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Construct a QuarantineFilter to specify criteria for listing records, including tenant ID, file hash, date range, and pagination. Optionally include expired records.

```rust
let filter = QuarantineFilter::new()
    // By tenant
    .with_tenant_id("tenant-123")
    
    // By file hash
    .with_file_hash("abc123...")
    
    // By date range
    .with_date_range(
        Some(Utc::now() - chrono::Duration::days(7)),
        None,
    )
    
    // Pagination
    .with_pagination(20, 0)  // limit, offset
    
    // Include expired records
    .with_include_expired(true);
```

--------------------------------

### Store a File in Quarantine

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Create a QuarantineRecord with file details and store it using the quarantine system. This is used after a scan identifies an infected file.

```rust
use scanbridge::quarantine::{QuarantineRecord, FilesystemQuarantine};

// After a scan with infected result...
let record = QuarantineRecord::new(
    result.file_hash().clone(),
    result.file_metadata.size,
    "Malware detected: Trojan.GenericKD",
    result.clone(),
)
.with_original_filename("suspicious.exe")
.with_tenant_id("customer-123")
.with_metadata("source", "email-attachment");

let id = quarantine.store(&input, record).await?;
println!("File quarantined with ID: {}", id);
```

--------------------------------

### CloudWatch Logs Configuration

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Sets up JSON logging for CloudWatch. Disables ANSI color codes for compatibility with CloudWatch's text-based log streams.

```rust
// Use tracing-subscriber with JSON formatting
// Forward stdout/stderr to CloudWatch via container logging driver
tracing_subscriber::fmt()
    .json()
    .with_target(true)
    .with_ansi(false)  // No color codes
    .init();
```

--------------------------------

### JSON Output Logging

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Configures logging to output in JSON format for machine readability. Includes target information but disables current span tracking.

```rust
use tracing_subscriber::fmt::format::FmtSpan;

tracing_subscriber::fmt()
    .json()
    .with_target(true)
    .with_current_span(false)
    .init();
```

--------------------------------

### Configure Half-Open Max Probes

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Limits the number of concurrent probe requests allowed when the circuit is in the half-open state. This prevents overwhelming a recovering service.

```rust
.with_half_open_max_probes(1)  // Default: 1
```

--------------------------------

### Datadog JSON Logging

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Configures JSON logging suitable for Datadog, including target information and current span tracking. Alternatively, suggests using the `datadog-tracing` crate for native integration.

```rust
// Datadog expects specific JSON format
// Use custom formatting or datadog-tracing crate
tracing_subscriber::fmt()
    .json()
    .with_target(true)
    .with_current_span(true)
    .init();

// Or use datadog-tracing for native integration
```

--------------------------------

### ThreatIntelScanner Constructor

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Creates a new ThreatIntelScanner instance, initializing the HTTP client with a specified timeout.

```rust
impl ThreatIntelScanner {
    pub fn new(config: ThreatIntelConfig) -> Result<Self, ScanError> {
        let client = reqwest::Client::builder()
            .timeout(config.timeout)
            .build()
            .map_err(|e| ScanError::configuration(format!(
                "Failed to create HTTP client: {}", e
            )))?;

        Ok(Self {
            config,
            client,
            // Enable SHA256 for API compatibility
            hasher: FileHasher::new().with_sha256(true),
        })
    }
}
```

--------------------------------

### Implement a Custom Scanner Backend

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Implement the Scanner trait to create a custom backend for Scanbridge. This involves defining the scanner's name, scan logic, and health check.

```rust
use scanbridge::prelude::*;
use async_trait::async_trait;

#[derive(Debug)]
struct MyScanner { /* ... */ }

#[async_trait]
impl Scanner for MyScanner {
    fn name(&self) -> &str { "my-scanner" }

    async fn scan(&self, input: &FileInput) -> Result<ScanResult, ScanError> {
        // Your scanning logic here
        todo!()
    }

    async fn health_check(&self) -> Result<(), ScanError> {
        // Verify scanner is operational
        Ok(())
    }
}
```

--------------------------------

### Fallback Scanner Configuration

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Set up an alternate scanner to be used when the primary scanner's circuit breaker is open. This ensures scans continue using a fallback mechanism.

```rust
use std::sync::Arc;

let primary = ClamAvScanner::new(config)?;
let fallback: Arc<dyn Scanner> = Arc::new(MockScanner::new_clean());

let config = CircuitBreakerConfig::default()
    .with_fallback_behavior(FallbackBehavior::Fallback(fallback));

let protected = CircuitBreaker::new(primary, config);
```

--------------------------------

### Strict Circuit Breaker Configuration

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Use this configuration for security-critical paths. It opens quickly and recovers slowly.

```rust
let config = CircuitBreakerConfig::strict();
// failure_threshold: 3
// success_threshold: 5
// open_duration: 60s
// fallback: FailClosed
```

--------------------------------

### OpenTelemetry Logging with Jaeger

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Configures logging to send traces to Jaeger via OpenTelemetry. Includes standard console logging alongside the OpenTelemetry layer.

```rust
use tracing_opentelemetry::OpenTelemetryLayer;
use opentelemetry::global;

let tracer = opentelemetry_jaeger::new_pipeline()
    .with_service_name("scanbridge")
    .install_simple()?;

tracing_subscriber::registry()
    .with(tracing_subscriber::fmt::layer())
    .with(OpenTelemetryLayer::new(tracer))
    .init();
```

--------------------------------

### Access Circuit Breaker Metrics

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Retrieve and print various performance metrics of the circuit breaker, such as request counts, rejection counts, and success rate.

```rust
let metrics = protected.metrics();

println!("Total requests: {}", metrics.total_requests);
println!("Successful: {}", metrics.successful_requests);
println!("Failed: {}", metrics.failed_requests);
println!("Rejected (circuit open): {}", metrics.rejected_requests);
println!("Times opened: {}", metrics.times_opened);
println!("Times closed: {}", metrics.times_closed);
println!("Success rate: {:.1}%", metrics.success_rate() * 100.0);
```

--------------------------------

### Define Policy Rules for Scan Results

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Use PolicyEngine to define rules with conditions and actions for handling scan results. Rules can be prioritized.

```rust
use scanbridge::policy::{PolicyEngine, PolicyRule, Condition, PolicyAction};

let policy = PolicyEngine::new()
    .with_rule(
        PolicyRule::new("block-infected", PolicyAction::block("Malware detected"))
            .with_condition(Condition::is_infected())
            .with_priority(100)
    )
    .with_rule(
        PolicyRule::new("quarantine-suspicious", PolicyAction::quarantine("Review needed"))
            .with_condition(Condition::is_suspicious())
            .with_priority(90)
    );
```

--------------------------------

### Built-in Failure Policies

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Utilize predefined failure policies for common scenarios. Options include the default policy, counting all errors, or only connection-related failures.

```rust
// Default: timeouts, connections, unavailable
let policy = FailurePolicy::default();
```

```rust
// Count all errors as failures
let policy = FailurePolicy::all_errors();
```

```rust
// Only connection-related failures
let policy = FailurePolicy::connection_only();
```

--------------------------------

### List Quarantine Records with Filter

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Retrieve a list of quarantine records based on specified filters, such as tenant ID. This is useful for auditing or managing quarantined items.

```rust
use scanbridge::quarantine::QuarantineFilter;

// List all records for a tenant
let filter = QuarantineFilter::new()
    .with_tenant_id("customer-123");

let records = quarantine.list(filter).await?;
for record in records {
    println!("{}: {} ({})", 
        record.id, 
        record.original_filename.unwrap_or_default(),
        record.quarantined_at);
}
```

--------------------------------

### Integrate Scanner with Circuit Breaker

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Demonstrates how to wrap a ThreatIntelScanner instance with a CircuitBreaker for enhanced resilience. This protected instance can then be added to the ScanManager.

```rust
use scanbridge::circuit_breaker::{CircuitBreaker, CircuitBreakerConfig};

let scanner = ThreatIntelScanner::new(config)?;
let protected = CircuitBreaker::new(
    scanner,
    CircuitBreakerConfig::default(),
);

// Now protected can be used with ScanManager
let manager = ScanManager::builder()
    .add_scanner(protected)
    .build()?;
```

--------------------------------

### Retrieve a File from Quarantine

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Fetch quarantined file data and its associated record using a unique ID. Handle retrieved files with extreme caution as they may be malicious.

```rust
let (file_data, record) = quarantine.retrieve(&id).await?;

println!("Original filename: {:?}", record.original_filename);
println!("Quarantined at: {}", record.quarantined_at);
println!("Reason: {}", record.reason);
println!("File size: {} bytes", file_data.len());
```

--------------------------------

### ThreatIntelConfig Struct

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Configuration for the threat intel scanner, including API details and timeouts.

```rust
use scanbridge::prelude::*;
use async_trait::async_trait;

/// Configuration for the threat intel scanner.
#[derive(Debug, Clone)]
pub struct ThreatIntelConfig {
    pub api_url: String,
    pub api_key: secrecy::SecretString,
    pub timeout: std::time::Duration,
    pub max_file_size: u64,
}

impl Default for ThreatIntelConfig {
    fn default() -> Self {
        Self {
            api_url: "https://api.threatintel.example.com/v1".into(),
            api_key: secrecy::SecretString::new("".into()),
            timeout: std::time::Duration::from_secs(30),
            max_file_size: 100 * 1024 * 1024, // 100 MB
        }
    }
}
```

--------------------------------

### Emit Custom Audit Event

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Use this snippet to log application-specific events within the audit log. Ensure the `tracing` crate is included and the target filter is set correctly.

```rust
use tracing::info;

// After processing a scan result
info!(
    target: "scanbridge::audit",
    event_type = "file_processed",
    file_hash_blake3 = %report.file_hash.blake3,
    outcome = ?report.aggregated_outcome,
    storage_path = %final_path,
    processing_duration_ms = processing_time.as_millis(),
    "File processing completed"
);
```

--------------------------------

### Fail Closed Fallback Behavior

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Configure the circuit breaker to reject all scans when the circuit is open. This is the safest default option.

```rust
use scanbridge::circuit_breaker::FallbackBehavior;

let config = CircuitBreakerConfig::default()
    .with_fallback_behavior(FallbackBehavior::FailClosed);
```

--------------------------------

### Configure Success Threshold

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Determines the number of successful probes needed in the half-open state to close the circuit. A higher threshold ensures the service is stable before resuming normal traffic.

```rust
.with_success_threshold(3)  // Default: 3
```

--------------------------------

### Integrate Circuit Breaker Scanners with ScanManager

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Wrap scanners with circuit breakers and add them to a ScanManager. Each scanner will have its own independent circuit breaker state.

```rust
use std::sync::Arc;

let clamav = ClamAvScanner::new(clamav_config)?;
let clamav_cb = CircuitBreaker::new(clamav, CircuitBreakerConfig::strict());

let vt = VirusTotalScanner::new(vt_config)?;
let vt_cb = CircuitBreaker::new(vt, CircuitBreakerConfig::high_availability());

let manager = ScanManager::builder()
    .add_arc_scanner(Arc::new(clamav_cb))
    .add_arc_scanner(Arc::new(vt_cb))
    .build()?;
```

--------------------------------

### Integration Test for Real API Scan

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Tests the scanner's ability to interact with a real API by scanning the EICAR test file. Requires the THREAT_INTEL_API_KEY environment variable to be set.

```rust
#[tokio::test]
#[ignore] // Run with: cargo test -- --ignored
async fn test_real_api() {
    let config = ThreatIntelConfig {
        api_key: std::env::var("THREAT_INTEL_API_KEY")
            .expect("Set THREAT_INTEL_API_KEY")
            .into(),
        ..Default::default()
    };

    let scanner = ThreatIntelScanner::new(config).unwrap();
    
    // Test with EICAR test file
    let eicar = b"X5O!P%@AP[4\\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*";
    let input = FileInput::from_bytes(eicar.to_vec());
    
    let result = scanner.scan(&input).await.unwrap();
    assert!(result.is_infected());
}
```

--------------------------------

### Configure Open Duration

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Specifies how long the circuit breaker remains in the open state before transitioning to half-open. This duration allows the protected service time to recover.

```rust
.with_open_duration(Duration::from_secs(30))  // Default: 30s
```

--------------------------------

### Configure Circuit Breaker

Source: https://github.com/dotdon/scanbridge/blob/main/README.md

Configure the circuit breaker with failure and success thresholds, and the duration the circuit remains open. This helps prevent cascading failures by temporarily blocking requests to an unhealthy scanner.

```rust
use scanbridge::circuit_breaker::{CircuitBreaker, CircuitBreakerConfig};
use std::time::Duration;

let config = CircuitBreakerConfig::default()
    .with_failure_threshold(5)           // Open after 5 failures
    .with_open_duration(Duration::from_secs(30))  // Stay open 30s
    .with_success_threshold(3);          // Close after 3 successes

let protected = CircuitBreaker::new(scanner, config);
```

--------------------------------

### Policy Rule Structure

Source: https://github.com/dotdon/scanbridge/blob/main/docs/architecture.md

Defines a policy rule for the policy engine, specifying conditions and actions. Higher priority rules are evaluated first.

```rust
PolicyRule {
    id: "block-infected",
    name: "Block Infected Files",
    conditions: [Condition::is_infected()],
    action: PolicyAction::Block { reason: "Malware detected" },
    priority: 100,  // Higher = evaluated first
}
```

--------------------------------

### Custom Failure Policy Configuration

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Configure which error types are counted as failures for the circuit breaker. Set specific boolean flags for timeouts, connection failures, engine unavailability, rate limiting, and all other errors.

```rust
use scanbridge::circuit_breaker::FailurePolicy;

let policy = FailurePolicy {
    count_timeouts: true,              // Connection/scan timeouts
    count_connection_failures: true,   // Network errors
    count_engine_unavailable: true,    // Service down
    count_rate_limited: false,         // Rate limiting (expected)
    count_all_errors: false,           // Everything else
};

let config = CircuitBreakerConfig::default()
    .with_failure_policy(policy);
```

--------------------------------

### Implement Scanner Trait for ThreatIntelScanner

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Implements the Scanner trait for ThreatIntelScanner, defining how it scans files and performs health checks.

```rust
@async_trait
impl Scanner for ThreatIntelScanner {
    fn name(&self) -> &str {
        "threat-intel"
    }

    async fn scan(&self, input: &FileInput) -> Result<ScanResult, ScanError> {
        use std::time::Instant;
        let start = Instant::now();

        // 1. Read and hash the file
        let data = self.read_file(input).await?;
        
        if data.len() as u64 > self.config.max_file_size {
            return Err(ScanError::FileTooLarge {
                size: data.len() as u64,
                max: self.config.max_file_size,
            });
        }

        let hash = self.hasher.hash_bytes(&data);

        // 2. Query the threat intel API
        let outcome = self.query_api(&hash).await?;

        // 3. Build the result
        let duration = start.elapsed();
        let metadata = FileMetadata::new(data.len() as u64, hash)
            .with_filename(input.filename().unwrap_or("unknown").to_string());

        Ok(ScanResult::new(
            outcome,
            metadata,
            self.name(),
            duration,
            ScanContext::new(),
        ))
    }

    async fn health_check(&self) -> Result<(), ScanError> {
        // Check API is reachable with a simple request
        let url = format!("{}/health", self.config.api_url);
        
        let response = self.client
            .get(&url)
            .header("X-API-Key", self.config.api_key.expose_secret())
            .send()
            .await
            .map_err(|e| ScanError::connection_failed(self.name(), e.to_string()))?;

        if response.status().is_success() {
            Ok(())
        } else {
            Err(ScanError::engine_unavailable(
                self.name(),
                format!("Health check failed: {}", response.status()),
            ))
        }
    }

    fn max_file_size(&self) -> Option<u64> {
        Some(self.config.max_file_size)
    }
}
```

--------------------------------

### QuarantineStore Trait Interface

Source: https://github.com/dotdon/scanbridge/blob/main/docs/architecture.md

Defines the asynchronous interface for interacting with the quarantine storage system. Implement this trait for custom storage backends.

```rust
pub trait QuarantineStore: Send + Sync {
    async fn store(&self, input: &FileInput, record: QuarantineRecord) -> Result<QuarantineId, QuarantineError>;
    async fn retrieve(&self, id: &QuarantineId) -> Result<(Vec<u8>, QuarantineRecord), QuarantineError>;
    async fn delete(&self, id: &QuarantineId) -> Result<(), QuarantineError>;
    async fn list(&self, filter: QuarantineFilter) -> Result<Vec<QuarantineRecord>, QuarantineError>;
}
```

--------------------------------

### High Availability Circuit Breaker Configuration

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

This configuration is tolerant of failures with quick recovery, suitable for non-critical scans.

```rust
let config = CircuitBreakerConfig::high_availability();
// failure_threshold: 10
// success_threshold: 2
// open_duration: 10s
// fallback: FailClosed
```

--------------------------------

### ThreatIntelScanner Struct

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Represents a scanner that queries a threat intelligence API.

```rust
/// A scanner that checks file hashes against a threat intelligence API.
#[derive(Debug)]
pub struct ThreatIntelScanner {
    config: ThreatIntelConfig,
    client: reqwest::Client,
    hasher: FileHasher,
}
```

--------------------------------

### Filter to Audit Events

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

Configures JSON logging to filter and only display events from the 'scanbridge::audit' target at INFO level or higher.

```rust
use tracing_subscriber::EnvFilter;

tracing_subscriber::fmt()
    .json()
    .with_env_filter(
        EnvFilter::new("scanbridge::audit=info")
    )
    .init();
```

--------------------------------

### Increment Quarantine Metrics

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Use this snippet to increment metrics after quarantine operations, such as adding a file or updating storage usage.

```rust
// After quarantine operations
metrics.quarantine_files_total.inc();
metrics.quarantine_storage_bytes.add(record.file_size as f64);
```

--------------------------------

### Scanner Trait Definition

Source: https://github.com/dotdon/scanbridge/blob/main/docs/architecture.md

Defines the core interface for all scanning backends. Implementations must handle sending data and parsing results asynchronously.

```rust
#[async_trait]
pub trait Scanner: Send + Sync + Debug {
    fn name(&self) -> &str;
    async fn scan(&self, input: &FileInput) -> Result<ScanResult, ScanError>;
    async fn health_check(&self) -> Result<(), ScanError>;
}
```

--------------------------------

### Quarantine Operation Event Structure

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

This JSON structure details an audit log event for quarantine actions. It includes the quarantine ID, file hash, operation type, reason, and file size.

```json
{
  "event_type": "quarantine_operation",
  "quarantine_id": "770e8400-e29b-41d4-a716-446655440002",
  "file_hash_blake3": "abc123...",
  "operation": "store",
  "reason": "Malware detected",
  "tenant_id": "customer-123",
  "file_size": 15234
}
```

--------------------------------

### Scan Completed Event Structure

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

This JSON structure details an audit log event for a completed scan by a single engine. It includes file hashes, scan outcome, engine used, and duration.

```json
{
  "event_type": "scan_completed",
  "scan_id": "550e8400-e29b-41d4-a716-446655440000",
  "file_hash_blake3": "abc123...",
  "file_hash_sha256": "def456...",
  "outcome": "clean",
  "engine": "clamav",
  "duration_ms": 150,
  "tenant_id": "customer-123",
  "cached": false
}
```

--------------------------------

### Configure Failure Threshold

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Sets the number of consecutive failures required to open the circuit. Lower values are stricter, while higher values are more tolerant of temporary issues.

```rust
.with_failure_threshold(5)  // Default: 5
```

--------------------------------

### Inspect Circuit Breaker State

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Retrieve and print the current state of the circuit breaker, including details specific to each state (Closed, Open, HalfOpen).

```rust
let state = protected.state();
println!("Current state: {:?}", state.name());
// "closed", "open", or "half_open"

match state {
    BreakerState::Closed { failure_count } => {
        println!("Failures so far: {}", failure_count);
    }
    BreakerState::Open { opened_at, until } => {
        println!("Opened at: {:?}", opened_at);
        println!("Will transition at: {:?}", until);
    }
    BreakerState::HalfOpen { success_count, probe_count } => {
        println!("Successes: {}/{}", success_count, config.success_threshold);
    }
}
```

--------------------------------

### Unit Test for Health Check

Source: https://github.com/dotdon/scanbridge/blob/main/docs/adding-backends.md

Tests the health check functionality of a scanner using a mock server. Ensures the scanner correctly reports a healthy status.

```rust
#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn test_health_check_success() {
        // Set up mock server
        let mock_server = mockito::Server::new();
        let _m = mock_server.mock("GET", "/health")
            .with_status(200)
            .create();

        let config = ThreatIntelConfig {
            api_url: mock_server.url(),
            ..Default::default()
        };

        let scanner = ThreatIntelScanner::new(config).unwrap();
        assert!(scanner.health_check().await.is_ok());
    }

    #[tokio::test]
    async fn test_scan_clean_file() {
        // Test scanning returns Clean for unknown hash
    }

    #[tokio::test]
    async fn test_scan_malicious_file() {
        // Test scanning returns Infected for known-bad hash
    }
}
```

--------------------------------

### Policy Decision Event Structure

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

This JSON structure represents an audit log event when a policy decision is made. It details the file hash, the action taken, and the matched rule.

```json
{
  "event_type": "policy_decision",
  "file_hash_blake3": "abc123...",
  "action": "block",
  "matched_rule_id": "block-infected",
  "matched_rule_name": "Block Infected Files",
  "reason": "Matched rule: Block Infected Files",
  "tenant_id": "customer-123"
}
```

--------------------------------

### Scan Report Event Structure

Source: https://github.com/dotdon/scanbridge/blob/main/docs/audit-logging.md

This JSON structure represents an audit log event for a complete scan report, aggregating results from multiple engines. It includes aggregated outcome, engine details, and threat information.

```json
{
  "event_type": "scan_report",
  "report_id": "660e8400-e29b-41d4-a716-446655440001",
  "file_hash_blake3": "abc123...",
  "aggregated_outcome": "infected",
  "engines": ["clamav", "virustotal"],
  "engine_count": 2,
  "total_duration_ms": 1250,
  "tenant_id": "customer-123",
  "threat_count": 1,
  "threats": [
    {"name": "Trojan.GenericKD", "severity": "high", "engine": "clamav"}
  ]
}
```

--------------------------------

### Manually Control Circuit Breaker State

Source: https://github.com/dotdon/scanbridge/blob/main/docs/circuit-breaker.md

Manually force the circuit breaker into an open or closed state, or reset its state and metrics.

```rust
// Force circuit open (e.g., during maintenance)
protected.force_open();

// Force circuit closed
protected.force_close();

// Reset state and metrics
protected.reset();
```

--------------------------------

### Delete and Cleanup Quarantine Records

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Remove a specific quarantine record by its ID or clean up all expired records from the quarantine system. The cleanup operation returns the count of deleted records.

```rust
// Delete a specific record
quarantine.delete(&id).await?;

// Clean up expired records
let deleted_count = quarantine.cleanup_expired().await?;
println!("Cleaned up {} expired records", deleted_count);
```

--------------------------------

### Set Expiration for Quarantined Records

Source: https://github.com/dotdon/scanbridge/blob/main/docs/quarantine.md

Set an expiration date for a quarantined record using chrono::Duration. This is useful for automatically removing old quarantine entries.

```rust
use chrono::{Utc, Duration};

let record = QuarantineRecord::new(...) 
    .with_expires_at(Utc::now() + Duration::days(90));
```

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