compliance-scanner-agent/compliance-dast/src/tools/api_fuzzer.rs

use compliance_core::error::CoreError;
use compliance_core::traits::dast_agent::{
    DastAgent, DastContext, DiscoveredEndpoint, EndpointParameter,
};
use compliance_core::traits::pentest_tool::{PentestTool, PentestToolContext, PentestToolResult};
use serde_json::json;

use crate::agents::api_fuzzer::ApiFuzzerAgent;

/// PentestTool wrapper around the existing ApiFuzzerAgent.
pub struct ApiFuzzerTool {
    _http: reqwest::Client,
    agent: ApiFuzzerAgent,
}

impl ApiFuzzerTool {
    pub fn new(http: reqwest::Client) -> Self {
        let agent = ApiFuzzerAgent::new(http.clone());
        Self { _http: http, agent }
    }

    fn parse_endpoints(input: &serde_json::Value) -> Vec<DiscoveredEndpoint> {
        let mut endpoints = Vec::new();
        if let Some(arr) = input.get("endpoints").and_then(|v| v.as_array()) {
            for ep in arr {
                let url = ep
                    .get("url")
                    .and_then(|v| v.as_str())
                    .unwrap_or_default()
                    .to_string();
                let method = ep
                    .get("method")
                    .and_then(|v| v.as_str())
                    .unwrap_or("GET")
                    .to_string();
                let mut parameters = Vec::new();
                if let Some(params) = ep.get("parameters").and_then(|v| v.as_array()) {
                    for p in params {
                        parameters.push(EndpointParameter {
                            name: p
                                .get("name")
                                .and_then(|v| v.as_str())
                                .unwrap_or_default()
                                .to_string(),
                            location: p
                                .get("location")
                                .and_then(|v| v.as_str())
                                .unwrap_or("query")
                                .to_string(),
                            param_type: p
                                .get("param_type")
                                .and_then(|v| v.as_str())
                                .map(String::from),
                            example_value: p
                                .get("example_value")
                                .and_then(|v| v.as_str())
                                .map(String::from),
                        });
                    }
                }
                endpoints.push(DiscoveredEndpoint {
                    url,
                    method,
                    parameters,
                    content_type: ep
                        .get("content_type")
                        .and_then(|v| v.as_str())
                        .map(String::from),
                    requires_auth: ep
                        .get("requires_auth")
                        .and_then(|v| v.as_bool())
                        .unwrap_or(false),
                });
            }
        }
        endpoints
    }
}

impl PentestTool for ApiFuzzerTool {
    fn name(&self) -> &str {
        "api_fuzzer"
    }

    fn description(&self) -> &str {
        "Fuzzes API endpoints to discover misconfigurations, information disclosure, and hidden \
         endpoints. Probes common sensitive paths and tests for verbose error messages."
    }

    fn input_schema(&self) -> serde_json::Value {
        json!({
            "type": "object",
            "properties": {
                "endpoints": {
                    "type": "array",
                    "description": "Known endpoints to fuzz",
                    "items": {
                        "type": "object",
                        "properties": {
                            "url": { "type": "string" },
                            "method": { "type": "string", "enum": ["GET", "POST", "PUT", "PATCH", "DELETE"] },
                            "parameters": {
                                "type": "array",
                                "items": {
                                    "type": "object",
                                    "properties": {
                                        "name": { "type": "string" },
                                        "location": { "type": "string" },
                                        "param_type": { "type": "string" },
                                        "example_value": { "type": "string" }
                                    },
                                    "required": ["name"]
                                }
                            }
                        },
                        "required": ["url"]
                    }
                },
                "base_url": {
                    "type": "string",
                    "description": "Base URL to probe for common sensitive paths (used if no endpoints provided)"
                }
            }
        })
    }

    fn execute<'a>(
        &'a self,
        input: serde_json::Value,
        context: &'a PentestToolContext,
    ) -> std::pin::Pin<
        Box<dyn std::future::Future<Output = Result<PentestToolResult, CoreError>> + Send + 'a>,
    > {
        Box::pin(async move {
            let mut endpoints = Self::parse_endpoints(&input);

            // If a base_url is provided but no endpoints, create a default endpoint
            if endpoints.is_empty() {
                if let Some(base) = input.get("base_url").and_then(|v| v.as_str()) {
                    endpoints.push(DiscoveredEndpoint {
                        url: base.to_string(),
                        method: "GET".to_string(),
                        parameters: Vec::new(),
                        content_type: None,
                        requires_auth: false,
                    });
                }
            }

            if endpoints.is_empty() {
                return Ok(PentestToolResult {
                    summary: "No endpoints or base_url provided to fuzz.".to_string(),
                    findings: Vec::new(),
                    data: json!({}),
                });
            }

            let dast_context = DastContext {
                endpoints,
                technologies: Vec::new(),
                sast_hints: Vec::new(),
            };

            let findings = self.agent.run(&context.target, &dast_context).await?;
            let count = findings.len();

            Ok(PentestToolResult {
                summary: if count > 0 {
                    format!("Found {count} API misconfigurations or information disclosures.")
                } else {
                    "No API misconfigurations detected.".to_string()
                },
                findings,
                data: json!({ "endpoints_tested": dast_context.endpoints.len() }),
            })
        })
    }
}