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// Copyright 2017 Dmitry Tantsur <divius.inside@gmail.com>
//
// 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.

//! Base code for authentication.

use std::fmt::Debug;

use reqwest::{Method, Url};

use super::super::Result;
use super::super::session::RequestBuilder;


/// Trait for an authentication method.
///
/// An OpenStack authentication method is expected to be able to:
///
/// 1. get an authentication token to use when accessing services,
/// 2. get an endpoint URL for the given service type.
///
/// An authentication method should cache the token as long as it's valid.
pub trait AuthMethod: BoxedClone + Debug {
    /// Default endpoint interface that is used when none is provided.
    fn default_endpoint_interface(&self) -> String {
        String::from("public")
    }

    /// Region used with this authentication (if any).
    fn region(&self) -> Option<String> { None }

    /// Get a URL for the requested service.
    fn get_endpoint(&self, service_type: String,
                    endpoint_interface: Option<String>) -> Result<Url>;

    /// Create an authenticated request.
    fn request(&self, method: Method, url: Url) -> Result<RequestBuilder>;

    /// Refresh the authentication (renew the token, etc).
    fn refresh(&mut self) -> Result<()>;
}


/// Helper trait to allow cloning of sessions.
pub trait BoxedClone {
    /// Clone the authentication method.
    fn boxed_clone(&self) -> Box<AuthMethod>;
}

impl<T> BoxedClone for T where T: 'static + AuthMethod + Clone {
    fn boxed_clone(&self) -> Box<AuthMethod> {
        Box::new(self.clone())
    }
}

impl Clone for Box<AuthMethod> {
    fn clone(&self) -> Box<AuthMethod> {
        self.boxed_clone()
    }
}