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    // MinIO Rust Library for Amazon S3 Compatible Cloud Storage
    // Copyright 2022 MinIO, Inc.
    //
    // 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.

    use crate::s3::utils;
    use std::any::Any;

    pub trait Sse: std::fmt::Debug {
        fn headers(&self) -> utils::Multimap;
        fn copy_headers(&self) -> utils::Multimap;
        fn tls_required(&self) -> bool;
        fn as_any(&self) -> &dyn Any;
    }

    #[derive(Clone, Debug)]
    pub struct SseCustomerKey {
        headers: utils::Multimap,
        copy_headers: utils::Multimap,
    }

    impl SseCustomerKey {
        pub fn new(key: &str) -> SseCustomerKey {
            let b64key = utils::b64encode(key);
            let md5key = utils::md5sum_hash(key.as_bytes());

            let mut headers = utils::Multimap::new();
            headers.insert(
                String::from("X-Amz-Server-Side-Encryption-Customer-Algorithm"),
                String::from("AES256"),
            );
            headers.insert(
                String::from("X-Amz-Server-Side-Encryption-Customer-Key"),
                b64key.clone(),
            );
            headers.insert(
                String::from("X-Amz-Server-Side-Encryption-Customer-Key-MD5"),
                md5key.clone(),
            );

            let mut copy_headers = utils::Multimap::new();
            copy_headers.insert(
                String::from("X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm"),
                String::from("AES256"),
            );
            copy_headers.insert(
                String::from("X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key"),
                b64key.clone(),
            );
            copy_headers.insert(
                String::from("X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-MD5"),
                md5key.clone(),
            );

            SseCustomerKey {
                headers: headers,
                copy_headers: copy_headers,
            }
        }
    }

    impl Sse for SseCustomerKey {
        fn headers(&self) -> utils::Multimap {
            self.headers.clone()
        }

        fn copy_headers(&self) -> utils::Multimap {
            self.copy_headers.clone()
        }

        fn tls_required(&self) -> bool {
            true
        }

        fn as_any(&self) -> &dyn Any {
            self
        }
    }

    #[derive(Clone, Debug)]
    pub struct SseKms {
        headers: utils::Multimap,
    }

    impl SseKms {
        pub fn new(key: &str, context: Option<&str>) -> SseKms {
            let mut headers = utils::Multimap::new();
            headers.insert(
                String::from("X-Amz-Server-Side-Encryption-Aws-Kms-Key-Id"),
                key.to_string(),
            );
            headers.insert(
                String::from("X-Amz-Server-Side-Encryption"),
                String::from("aws:kms"),
            );
            if let Some(v) = context {
                headers.insert(
                    String::from("X-Amz-Server-Side-Encryption-Context"),
                    utils::b64encode(v),
                );
            }

            SseKms { headers: headers }
        }
    }

    impl Sse for SseKms {
        fn headers(&self) -> utils::Multimap {
            self.headers.clone()
        }

        fn copy_headers(&self) -> utils::Multimap {
            utils::Multimap::new()
        }

        fn tls_required(&self) -> bool {
            true
        }

        fn as_any(&self) -> &dyn Any {
            self
        }
    }

    #[derive(Clone, Debug)]
    pub struct SseS3 {
        headers: utils::Multimap,
    }

    impl SseS3 {
        pub fn new() -> SseS3 {
            let mut headers = utils::Multimap::new();
            headers.insert(
                String::from("X-Amz-Server-Side-Encryption"),
                String::from("AES256"),
            );

            SseS3 { headers: headers }
        }
    }

    impl Sse for SseS3 {
        fn headers(&self) -> utils::Multimap {
            self.headers.clone()
        }

        fn copy_headers(&self) -> utils::Multimap {
            utils::Multimap::new()
        }

        fn tls_required(&self) -> bool {
            false
        }

        fn as_any(&self) -> &dyn Any {
            self
        }
    }