reqsign-volcengine-tos 3.0.0

Volcengine TOS signing implementation for reqsign.
Documentation 
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 reqsign_core::SigningCredential;
use reqsign_core::utils::Redact;
use std::fmt::{Debug, Formatter};

/// Credential for Volcengine TOS.
#[derive(Clone)]
pub struct Credential {
    /// Access key id.
    pub access_key_id: String,
    /// Secret access key.
    pub secret_access_key: String,
    /// Session token.
    pub session_token: Option<String>,
}

impl Credential {
    pub fn new(access_key_id: &str, secret_access_key: &str) -> Self {
        Self {
            access_key_id: access_key_id.to_string(),
            secret_access_key: secret_access_key.to_string(),
            session_token: None,
        }
    }

    pub fn with_session_token(mut self, token: &str) -> Self {
        self.session_token = Some(token.to_string());
        self
    }
}

impl Debug for Credential {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Credential")
            .field("access_key_id", &Redact::from(&self.access_key_id))
            .field("secret_access_key", &Redact::from(&self.secret_access_key))
            .field("session_token", &Redact::from(&self.session_token))
            .finish()
    }
}

impl SigningCredential for Credential {
    fn is_valid(&self) -> bool {
        !self.access_key_id.is_empty() && !self.secret_access_key.is_empty()
    }
}