piam-types 0.0.0

Patsnap IAM types
Documentation 
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use std::{ops::Deref, time::SystemTime};

use anyhow::Result;
use aws_sigv4::http_request::{
    sign, Error, SignableBody, SignableRequest, SigningParams, SigningSettings,
};
use aws_smithy_checksums::http::SHA_256_HEADER_NAME;
use http::{header::AUTHORIZATION, Request};
use hyper::{body, Body};

use crate::{
    amz_canonical_request::header::{X_AMZ_CONTENT_SHA_256, X_AMZ_DATE, X_AMZ_SECURITY_TOKEN},
    type_alias::{AmzSignParams, HttpRequest},
};

pub async fn sign_with_actual_key(
    mut req: HttpRequest,
    params: AmzSignParams,
) -> Result<HttpRequest> {
    // save checksum before signing
    let checksum = req.headers().get(X_AMZ_CONTENT_SHA_256).unwrap().clone();

    // see `aws_sigv4::http_request::sign::calculate_signing_headers`
    req.headers_mut().remove(X_AMZ_DATE);
    req.headers_mut().remove(X_AMZ_CONTENT_SHA_256);
    req.headers_mut().remove(X_AMZ_SECURITY_TOKEN);
    req.headers_mut().remove(AUTHORIZATION);

    // convert body to bytes for signing
    let (p, b) = req.into_parts();
    let bytes = body::to_bytes(b).await?;
    let mut byte_req = Request::from_parts(p, bytes);

    // do signing
    let signing_settings = SigningSettings::default();
    let signing_params = SigningParams::builder()
        .access_key(params.access_key)
        .secret_key(params.secret_key)
        .region(params.region)
        .service_name(params.service)
        .time(SystemTime::now())
        .settings(signing_settings)
        .build()?;
    let signable_request = SignableRequest::from(&byte_req);
    let (signing_instructions, _signature) = sign(signable_request, &signing_params)
        .unwrap()
        .into_parts();
    signing_instructions.apply_to_request(&mut byte_req);

    // restore body from bytes
    let (p, b) = byte_req.into_parts();
    req = Request::from_parts(p, Body::from(b));

    // restore checksum after signing
    req.headers_mut().insert(X_AMZ_CONTENT_SHA_256, checksum);
    Ok(req)
}