tiny-proxy 0.3.0

//! Token validation module for authentication
//!
//! This module provides functionality for validating tokens
//! against external authentication services.

use hyper::Request;

/// Validate an authentication token from a request
///
/// This function extracts the token from the request headers
/// and validates it against an external authentication service.
///
/// # Arguments
///
/// * `req` - The incoming HTTP request containing the token
/// * `validator_url` - URL of the external token validation service
///
/// # Returns
///
/// * `Ok(true)` - Token is valid
/// * `Ok(false)` - Token is invalid
/// * `Err(...)` - Error occurred during validation
///
/// # Example
///
/// ```no_run
/// use tiny_proxy::auth::validator::validate_token;
/// use hyper::Request;
/// use bytes::Bytes;
/// use http_body_util::Empty;
///
/// # #[tokio::main]
/// # async fn main() -> anyhow::Result<()> {
/// # let req = Request::builder().body(Empty::<Bytes>::new()).unwrap();
/// let is_valid = validate_token(&req, "http://auth-service:8080/validate").await?;
/// # Ok(())
/// # }
/// ```
pub async fn validate_token<B>(req: &Request<B>, validator_url: &str) -> anyhow::Result<bool> {
    // Extract token from Authorization header
    let auth_header = req
        .headers()
        .get("Authorization")
        .and_then(|h| h.to_str().ok())
        .ok_or_else(|| anyhow::anyhow!("Missing Authorization header"))?;

    // TODO: Implement actual token validation against external service
    // This is a placeholder implementation

    // In a real implementation, you would:
    // 1. Send a request to the validator_url with the token
    // 2. Wait for the response
    // 3. Return true/false based on the response

    tracing::debug!("Validating token against {}", validator_url);
    tracing::debug!("Token: {}", auth_header);

    // Placeholder: always return true for now
    Ok(true)
}

/// Validate token with custom header name
///
/// Similar to `validate_token` but allows specifying a custom header
/// name for the token (e.g., "X-Auth-Token" instead of "Authorization").
///
/// # Arguments
///
/// * `req` - The incoming HTTP request
/// * `validator_url` - URL of the external token validation service
/// * `header_name` - Name of the header containing the token
///
/// # Returns
///
/// * `Ok(true)` - Token is valid
/// * `Ok(false)` - Token is invalid
/// * `Err(...)` - Error occurred during validation
pub async fn validate_token_with_header<B>(
    req: &Request<B>,
    validator_url: &str,
    header_name: &str,
) -> anyhow::Result<bool> {
    // Extract token from custom header
    let auth_header = req
        .headers()
        .get(header_name)
        .and_then(|h| h.to_str().ok())
        .ok_or_else(|| anyhow::anyhow!("Missing {} header", header_name))?;

    tracing::debug!(
        "Validating token in {} header against {}",
        header_name,
        validator_url
    );
    tracing::debug!("Token: {}", auth_header);

    // Placeholder: always return true for now
    Ok(true)
}

#[cfg(test)]
mod tests {
    use bytes::Bytes;
    use http_body_util::Empty;
    use hyper::Request;

    #[test]
    fn test_validate_token_missing_header() {
        let _req = Request::builder().body(Empty::<Bytes>::new()).unwrap();

        // This would fail in a real async test, but we're just testing the logic
        let _validator_url = "http://auth-service:8080/validate";

        // Note: This test demonstrates the function signature
        // In a real test, you'd use a tokio::test and mock the HTTP client
    }

    #[test]
    fn test_validate_token_with_custom_header() {
        let _req = Request::builder()
            .header("X-Auth-Token", "test-token-123")
            .body(Empty::<Bytes>::new())
            .unwrap();

        let _validator_url = "http://auth-service:8080/validate";
        let _header_name = "X-Auth-Token";

        // Note: This test demonstrates the function signature
        // In a real test, you'd use a tokio::test and mock the HTTP client
    }
}