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#![cfg(target_family = "unix")]

//! [`Authenticator`] implementation that authenticates against [`PAM`].
//!
//! [`Authenticator`]: libunftp::auth::Authenticator
//! [`PAM`]: https://en.wikipedia.org/wiki/Pluggable_authentication_module

use async_trait::async_trait;
use libunftp::auth::*;

/// [`Authenticator`] implementation that authenticates against [`PAM`].
///
/// [`Authenticator`]: libunftp::auth::Authenticator
/// [`PAM`]: https://en.wikipedia.org/wiki/Pluggable_authentication_module
#[derive(Debug)]
pub struct PamAuthenticator {
    service: String,
}

impl PamAuthenticator {
    /// Initialize a new [`PamAuthenticator`] for the given PAM service.
    pub fn new<S: Into<String>>(service: S) -> Self {
        let service = service.into();
        PamAuthenticator { service }
    }
}

#[async_trait]
impl Authenticator<DefaultUser> for PamAuthenticator {
    #[allow(clippy::type_complexity)]
    #[tracing_attributes::instrument]
    async fn authenticate(&self, username: &str, creds: &Credentials) -> Result<DefaultUser, AuthenticationError> {
        let username = username.to_string();
        let password = creds.password.as_ref().ok_or(AuthenticationError::BadPassword)?;
        let service = self.service.clone();

        let mut auth = pam_auth::Authenticator::with_password(&service).map_err(|e| AuthenticationError::with_source("pam error", e))?;

        auth.get_handler().set_credentials(&username, password);
        auth.authenticate().map_err(|e| AuthenticationError::with_source("pam error", e))?;
        Ok(DefaultUser {})
    }
}