kindly-guard-server 0.11.14

// Copyright 2025 Kindly Software Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! WASM plugin loader for sandboxed plugins
//!
//! Loads plugins compiled to WebAssembly for strong isolation

use super::*;
use anyhow::Result;
use std::path::Path;
use tracing::{debug, info, warn};

/// WASM plugin loader stub
///
/// In production, this would use wasmtime or wasmer to load and execute
/// WASM modules in a sandboxed environment
pub struct WasmPluginLoader {
    _private: (),
}

impl WasmPluginLoader {
    /// Create a new WASM plugin loader
    pub fn new() -> Result<Self> {
        warn!("WASM plugin support is not fully implemented");
        Ok(Self { _private: () })
    }
}

#[async_trait]
impl PluginLoader for WasmPluginLoader {
    async fn load_plugin(&self, path: &Path) -> Result<Box<dyn SecurityPlugin>> {
        // In a real implementation, this would:
        // 1. Load the WASM module
        // 2. Create a sandboxed runtime
        // 3. Instantiate the plugin
        // 4. Return a wrapper that communicates with the WASM instance

        Err(anyhow::anyhow!("WASM plugin loading not implemented"))
    }

    async fn validate_plugin(&self, path: &Path) -> Result<PluginMetadata> {
        // Check if it's a WASM file
        let extension = path
            .extension()
            .and_then(|e| e.to_str())
            .ok_or_else(|| anyhow::anyhow!("No file extension"))?;

        if extension != "wasm" {
            return Err(anyhow::anyhow!("Not a WASM file"));
        }

        // In real implementation, would load and validate WASM module
        Err(anyhow::anyhow!("WASM validation not implemented"))
    }

    fn loader_type(&self) -> &'static str {
        "wasm"
    }
}

/// Example of what a WASM plugin wrapper would look like
#[allow(dead_code)]
struct WasmPluginWrapper {
    // engine: wasmtime::Engine,
    // instance: wasmtime::Instance,
    metadata: PluginMetadata,
}

#[async_trait]
impl SecurityPlugin for WasmPluginWrapper {
    fn metadata(&self) -> PluginMetadata {
        self.metadata.clone()
    }

    async fn initialize(&mut self, _config: serde_json::Value) -> Result<()> {
        // Call WASM export: plugin_initialize
        Ok(())
    }

    async fn scan(&self, _context: ScanContext<'_>) -> Result<Vec<Threat>> {
        // Call WASM export: plugin_scan
        // Marshal data in/out of WASM memory
        Ok(Vec::new())
    }

    async fn health_check(&self) -> Result<HealthStatus> {
        // Call WASM export: plugin_health_check
        Ok(HealthStatus {
            healthy: true,
            message: "WASM plugin healthy".to_string(),
            last_check: chrono::Utc::now(),
            metrics: PluginMetrics::default(),
        })
    }

    async fn shutdown(&mut self) -> Result<()> {
        // Call WASM export: plugin_shutdown
        Ok(())
    }
}