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#![allow(dead_code)]
use std::collections::HashMap;
use std::convert::TryFrom;
use chrono::{offset::Utc, DateTime};
use hmac::{Hmac, Mac};
use hyper::client::HttpConnector;
use hyper::{Body, Client, Method, Request, Response, Uri};
use super::garage::{Instance, Key};
use garage_api::signature;
/// You should ever only use this to send requests AWS sdk won't send,
/// like to reproduce behavior of unusual implementations found to be
/// problematic.
#[derive(Clone)]
pub struct CustomRequester {
key: Key,
uri: Uri,
service: &'static str,
client: Client<HttpConnector>,
}
impl CustomRequester {
pub fn new_s3(instance: &Instance, key: &Key) -> Self {
CustomRequester {
key: key.clone(),
uri: instance.s3_uri(),
service: "s3",
client: Client::new(),
}
}
pub fn new_k2v(instance: &Instance, key: &Key) -> Self {
CustomRequester {
key: key.clone(),
uri: instance.k2v_uri(),
service: "k2v",
client: Client::new(),
}
}
pub fn builder(&self, bucket: String) -> RequestBuilder<'_> {
RequestBuilder {
requester: self,
service: self.service,
bucket,
method: Method::GET,
path: String::new(),
query_params: HashMap::new(),
signed_headers: HashMap::new(),
unsigned_headers: HashMap::new(),
body: Vec::new(),
body_signature: BodySignature::Classic,
vhost_style: false,
}
}
}
pub struct RequestBuilder<'a> {
requester: &'a CustomRequester,
service: &'static str,
bucket: String,
method: Method,
path: String,
query_params: HashMap<String, Option<String>>,
signed_headers: HashMap<String, String>,
unsigned_headers: HashMap<String, String>,
body: Vec<u8>,
body_signature: BodySignature,
vhost_style: bool,
}
impl<'a> RequestBuilder<'a> {
pub fn service(&mut self, service: &'static str) -> &mut Self {
self.service = service;
self
}
pub fn method(&mut self, method: Method) -> &mut Self {
self.method = method;
self
}
pub fn path(&mut self, path: impl ToString) -> &mut Self {
self.path = path.to_string();
self
}
pub fn query_params(&mut self, query_params: HashMap<String, Option<String>>) -> &mut Self {
self.query_params = query_params;
self
}
pub fn query_param<T, U>(&mut self, param: T, value: Option<U>) -> &mut Self
where
T: ToString,
U: ToString,
{
self.query_params
.insert(param.to_string(), value.as_ref().map(ToString::to_string));
self
}
pub fn signed_headers(&mut self, signed_headers: HashMap<String, String>) -> &mut Self {
self.signed_headers = signed_headers;
self
}
pub fn signed_header(&mut self, name: impl ToString, value: impl ToString) -> &mut Self {
self.signed_headers
.insert(name.to_string(), value.to_string());
self
}
pub fn unsigned_headers(&mut self, unsigned_headers: HashMap<String, String>) -> &mut Self {
self.unsigned_headers = unsigned_headers;
self
}
pub fn unsigned_header(&mut self, name: impl ToString, value: impl ToString) -> &mut Self {
self.unsigned_headers
.insert(name.to_string(), value.to_string());
self
}
pub fn body(&mut self, body: Vec<u8>) -> &mut Self {
self.body = body;
self
}
pub fn body_signature(&mut self, body_signature: BodySignature) -> &mut Self {
self.body_signature = body_signature;
self
}
pub fn vhost_style(&mut self, vhost_style: bool) -> &mut Self {
self.vhost_style = vhost_style;
self
}
pub async fn send(&mut self) -> hyper::Result<Response<Body>> {
// TODO this is a bit incorrect in that path and query params should be url-encoded and
// aren't, but this is good enought for now.
let query = query_param_to_string(&self.query_params);
let (host, path) = if self.vhost_style {
(
format!("{}.{}.garage", self.bucket, self.service),
format!("{}{}", self.path, query),
)
} else {
(
format!("{}.garage", self.service),
format!("{}/{}{}", self.bucket, self.path, query),
)
};
let uri = format!("{}{}", self.requester.uri, path);
let now = Utc::now();
let scope = signature::compute_scope(&now, super::REGION.as_ref(), self.service);
let mut signer = signature::signing_hmac(
&now,
&self.requester.key.secret,
super::REGION.as_ref(),
self.service,
)
.unwrap();
let streaming_signer = signer.clone();
let mut all_headers = self.signed_headers.clone();
let date = now.format(signature::LONG_DATETIME).to_string();
all_headers.insert("x-amz-date".to_owned(), date);
all_headers.insert("host".to_owned(), host);
let body_sha = match self.body_signature {
BodySignature::Unsigned => "UNSIGNED-PAYLOAD".to_owned(),
BodySignature::Classic => hex::encode(garage_util::data::sha256sum(&self.body)),
BodySignature::Streaming(size) => {
all_headers.insert("content-encoding".to_owned(), "aws-chunked".to_owned());
all_headers.insert(
"x-amz-decoded-content-length".to_owned(),
self.body.len().to_string(),
);
// Get lenght of body by doing the conversion to a streaming body with an
// invalid signature (we don't know the seed) just to get its length. This
// is a pretty lazy and inefficient way to do it, but it's enought for test
// code.
all_headers.insert(
"content-length".to_owned(),
to_streaming_body(&self.body, size, String::new(), signer.clone(), now, "")
.len()
.to_string(),
);
"STREAMING-AWS4-HMAC-SHA256-PAYLOAD".to_owned()
}
};
all_headers.insert("x-amz-content-sha256".to_owned(), body_sha.clone());
let mut signed_headers = all_headers
.iter()
.map(|(k, _)| k.as_ref())
.collect::<Vec<&str>>();
signed_headers.sort();
let signed_headers = signed_headers.join(";");
all_headers.extend(self.unsigned_headers.clone());
let canonical_request = signature::payload::canonical_request(
&self.method,
&Uri::try_from(&uri).unwrap(),
&all_headers,
&signed_headers,
&body_sha,
);
let string_to_sign = signature::payload::string_to_sign(&now, &scope, &canonical_request);
signer.update(string_to_sign.as_bytes());
let signature = hex::encode(signer.finalize().into_bytes());
let authorization = format!(
"AWS4-HMAC-SHA256 Credential={}/{},SignedHeaders={},Signature={}",
self.requester.key.id, scope, signed_headers, signature
);
all_headers.insert("authorization".to_owned(), authorization);
let mut request = Request::builder();
for (k, v) in all_headers {
request = request.header(k, v);
}
let body = if let BodySignature::Streaming(size) = self.body_signature {
to_streaming_body(&self.body, size, signature, streaming_signer, now, &scope)
} else {
self.body.clone()
};
let request = request
.uri(uri)
.method(self.method.clone())
.body(Body::from(body))
.unwrap();
self.requester.client.request(request).await
}
}
pub enum BodySignature {
Unsigned,
Classic,
Streaming(usize),
}
fn query_param_to_string(params: &HashMap<String, Option<String>>) -> String {
if params.is_empty() {
return String::new();
}
"?".to_owned()
+ ¶ms
.iter()
.map(|(k, v)| {
if let Some(v) = v {
format!("{}={}", k, v)
} else {
k.clone()
}
})
.collect::<Vec<String>>()
.join("&")
}
fn to_streaming_body(
body: &[u8],
chunk_size: usize,
mut seed: String,
hasher: Hmac<sha2::Sha256>,
now: DateTime<Utc>,
scope: &str,
) -> Vec<u8> {
const SHA_NULL: &str = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
let now = now.format(signature::LONG_DATETIME).to_string();
let mut res = Vec::with_capacity(body.len());
for chunk in body.chunks(chunk_size).chain(std::iter::once(&[][..])) {
let to_sign = format!(
"AWS4-HMAC-SHA256-PAYLOAD\n{}\n{}\n{}\n{}\n{}",
now,
scope,
seed,
SHA_NULL,
hex::encode(garage_util::data::sha256sum(chunk))
);
let mut hasher = hasher.clone();
hasher.update(to_sign.as_bytes());
seed = hex::encode(hasher.finalize().into_bytes());
let header = format!("{:x};chunk-signature={}\r\n", chunk.len(), seed);
res.extend_from_slice(header.as_bytes());
res.extend_from_slice(chunk);
res.extend_from_slice(b"\r\n");
}
res
}
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