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// Copyright 2020 The Tink-Rust Authors
//
// 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.
//
///////////////////////////////////////////////////////////////////////////////

//! Testing server for PRF.

use crate::proto;

#[derive(Debug, Default)]
pub struct PrfSetServerImpl;

#[tonic::async_trait]
impl proto::prf_set_server::PrfSet for PrfSetServerImpl {
    async fn key_ids(
        &self,
        request: tonic::Request<proto::PrfSetKeyIdsRequest>,
    ) -> Result<tonic::Response<proto::PrfSetKeyIdsResponse>, tonic::Status> {
        let req = request.into_inner(); // discard metadata
        let closure = move || -> Result<_, tink_core::TinkError> {
            let cursor = std::io::Cursor::new(req.keyset);
            let mut reader = tink_core::keyset::BinaryReader::new(cursor);
            let handle = tink_core::keyset::insecure::read(&mut reader)?;
            let primitive = tink_prf::Set::new(&handle)?;
            let mut output = proto::prf_set_key_ids_response::Output {
                primary_key_id: primitive.primary_id,
                key_id: Vec::new(),
            };
            for key_id in primitive.prfs.keys() {
                output.key_id.push(*key_id);
            }
            Ok(output)
        };
        Ok(tonic::Response::new(proto::PrfSetKeyIdsResponse {
            result: Some(match closure() {
                Ok(output) => proto::prf_set_key_ids_response::Result::Output(output),
                Err(e) => proto::prf_set_key_ids_response::Result::Err(format!("{:?}", e)),
            }),
        }))
    }
    async fn compute(
        &self,
        request: tonic::Request<proto::PrfSetComputeRequest>,
    ) -> Result<tonic::Response<proto::PrfSetComputeResponse>, tonic::Status> {
        let req = request.into_inner(); // discard metadata
        let closure = move || {
            let cursor = std::io::Cursor::new(req.keyset.clone());
            let mut reader = tink_core::keyset::BinaryReader::new(cursor);
            let handle = tink_core::keyset::insecure::read(&mut reader)?;
            let primitive = tink_prf::Set::new(&handle)?;
            primitive.prfs[&req.key_id].compute_prf(&req.input_data, req.output_length as usize)
        };
        Ok(tonic::Response::new(proto::PrfSetComputeResponse {
            result: Some(match closure() {
                Ok(output) => proto::prf_set_compute_response::Result::Output(output),
                Err(e) => proto::prf_set_compute_response::Result::Err(format!("{:?}", e)),
            }),
        }))
    }
}