Doc: how to request S3 compatible API with signature

[foreseaz]

https://gist.github.com/foreseaz/0da077d6f2b2ac75cfc23946be2c470d

[foreseaz]

use sha2::{Sha256, Digest};

const S3_ACCESS: &str = "ACCESS";
const S3_SECRET: &str = "SECRET";

fn sha256_string(input: String) -> String {
    let mut hasher = Sha256::new();
    hasher.update(input);
    let result = hasher.finalize();
    format!("{:x}", result)
}

#[tokio::main]
async fn main() -> Result<(), reqwest::Error> {
    let datetime = chrono::Utc::now();
    let host = "{ACCOUNT_ID}.r2.cloudflarestorage.com";
    let url = format!("https://{}", host);
    let mut headers = reqwest::header::HeaderMap::new();

    headers.insert(
        "X-Amz-Date",
        datetime
            .format("%Y%m%dT%H%M%SZ")
            .to_string()
            .parse()
            .unwrap(),
    );
    headers.insert("host", host.parse().unwrap());
    let payload = "".to_string();
    let hashed_payload = sha256_string(payload);
    headers.insert("x-amz-content-sha256", hashed_payload.parse().unwrap());

    let s = aws_sign_v4::AwsSign::new(
        "GET",
        &url,
        &datetime,
        &headers,
        "auto",
        &S3_ACCESS,
        &S3_SECRET,
        "s3",
        ""
    );
    let signature = s.sign();
    println!("{:#?}", signature);
    headers.insert(reqwest::header::AUTHORIZATION, signature.parse().unwrap());

    let client = reqwest::Client::new();
    let res = client
        .get(url)
        .headers(headers.to_owned())
        .body("")
        .send()
        .await?;

    println!("Status: {}", res.status());
    let body = res.text().await?;
    println!("Body:\n\n{}", body);
    Ok(())
}

Rust version is simpler with aws_sign_v4