minio-rsc 0.2.6

rust for minio, api is compliant with the Amazon S3 protocol.
Documentation 
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//! Credential provider
use futures::Future;
use std::{env, pin::Pin};

use crate::Credentials;

pub type CredentialFuture = Pin<Box<dyn Future<Output = Credentials> + Send>>;

/// define Credential retriever.
pub trait Provider: Send + Sync {
    fn fetch(&self) -> CredentialFuture;
}

#[derive(Debug, Clone)]
pub struct StaticProvider(Credentials);

impl StaticProvider {
    /// Create a new StaticProvider instance.
    pub fn new<T: Into<String>>(ak: T, sk: T, st: Option<String>) -> Self {
        Self(Credentials::new(ak, sk, st, None))
    }

    /// load Credentials from MinIO environment variables.
    /// - `MINIO_ACCESS_KEY`
    /// - `MINIO_SECRET_KEY`
    /// - `MINIO_SESSION_TOKEN`
    pub fn from_env() -> Option<Self> {
        if let (Ok(ak), Ok(sk), st) = (
            env::var("MINIO_ACCESS_KEY"),
            env::var("MINIO_SECRET_KEY"),
            env::var("MINIO_SESSION_TOKEN"),
        ) {
            Some(Self::new(ak, sk, st.ok()))
        } else {
            None
        }
    }

    /// load Credentials from AWS environment variables.
    /// - `AWS_ACCESS_KEY_ID` or `AWS_ACCESS_KEY`
    /// - `AWS_SECRET_ACCESS_KEY` or `AWS_SECRET_KEY`
    /// - `AWS_SESSION_TOKEN`
    pub fn from_env_aws() -> Option<Self> {
        let ak = env::var("AWS_ACCESS_KEY_ID").or_else(|_| env::var("AWS_ACCESS_KEY"));
        let sk = env::var("AWS_SECRET_ACCESS_KEY").or_else(|_| env::var("AWS_SECRET_KEY"));
        let st = env::var("AWS_SESSION_TOKEN");
        if let (Ok(ak), Ok(sk), st) = (ak, sk, st) {
            Some(Self::new(ak, sk, st.ok()))
        } else {
            None
        }
    }
}

impl Provider for StaticProvider {
    fn fetch(&self) -> CredentialFuture {
        let cred = self.0.clone();
        Box::pin(async move { cred })
    }
}