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use std::convert::{TryFrom, TryInto};
use std::hash::Hasher;
use base64::prelude::*;
use crc32c::Crc32cHasher as Crc32c;
use crc32fast::Hasher as Crc32;
use md5::{Digest, Md5};
use sha1::Sha1;
use sha2::Sha256;
use http::{HeaderMap, HeaderValue};
use garage_util::error::OkOrMessage;
use garage_model::s3::object_table::*;
use garage_api_common::signature::checksum::*;
use crate::error::*;
#[derive(Default)]
pub(crate) struct MultipartChecksummer {
pub md5: Md5,
pub extra: Option<MultipartExtraChecksummer>,
}
pub(crate) enum MultipartExtraChecksummer {
Crc32(Crc32),
Crc32c(Crc32c),
Sha1(Sha1),
Sha256(Sha256),
}
impl MultipartChecksummer {
pub(crate) fn init(algo: Option<ChecksumAlgorithm>) -> Self {
Self {
md5: Md5::new(),
extra: match algo {
None => None,
Some(ChecksumAlgorithm::Crc32) => {
Some(MultipartExtraChecksummer::Crc32(Crc32::new()))
}
Some(ChecksumAlgorithm::Crc32c) => {
Some(MultipartExtraChecksummer::Crc32c(Crc32c::default()))
}
Some(ChecksumAlgorithm::Sha1) => Some(MultipartExtraChecksummer::Sha1(Sha1::new())),
Some(ChecksumAlgorithm::Sha256) => {
Some(MultipartExtraChecksummer::Sha256(Sha256::new()))
}
},
}
}
pub(crate) fn update(
&mut self,
etag: &str,
checksum: Option<ChecksumValue>,
) -> Result<(), Error> {
self.md5
.update(&hex::decode(&etag).ok_or_message("invalid etag hex")?);
match (&mut self.extra, checksum) {
(None, _) => (),
(
Some(MultipartExtraChecksummer::Crc32(ref mut crc32)),
Some(ChecksumValue::Crc32(x)),
) => {
crc32.update(&x);
}
(
Some(MultipartExtraChecksummer::Crc32c(ref mut crc32c)),
Some(ChecksumValue::Crc32c(x)),
) => {
crc32c.write(&x);
}
(Some(MultipartExtraChecksummer::Sha1(ref mut sha1)), Some(ChecksumValue::Sha1(x))) => {
sha1.update(&x);
}
(
Some(MultipartExtraChecksummer::Sha256(ref mut sha256)),
Some(ChecksumValue::Sha256(x)),
) => {
sha256.update(&x);
}
(Some(_), b) => {
return Err(Error::internal_error(format!(
"part checksum was not computed correctly, got: {:?}",
b
)))
}
}
Ok(())
}
pub(crate) fn finalize(self) -> (Md5Checksum, Option<ChecksumValue>) {
let md5 = self.md5.finalize()[..].try_into().unwrap();
let extra = match self.extra {
None => None,
Some(MultipartExtraChecksummer::Crc32(crc32)) => {
Some(ChecksumValue::Crc32(u32::to_be_bytes(crc32.finalize())))
}
Some(MultipartExtraChecksummer::Crc32c(crc32c)) => Some(ChecksumValue::Crc32c(
u32::to_be_bytes(u32::try_from(crc32c.finish()).unwrap()),
)),
Some(MultipartExtraChecksummer::Sha1(sha1)) => {
Some(ChecksumValue::Sha1(sha1.finalize()[..].try_into().unwrap()))
}
Some(MultipartExtraChecksummer::Sha256(sha256)) => Some(ChecksumValue::Sha256(
sha256.finalize()[..].try_into().unwrap(),
)),
};
(md5, extra)
}
}
// ----
/// Extract the value of the x-amz-checksum-algorithm header
pub(crate) fn request_checksum_algorithm(
headers: &HeaderMap<HeaderValue>,
) -> Result<Option<ChecksumAlgorithm>, Error> {
match headers.get(X_AMZ_CHECKSUM_ALGORITHM) {
None => Ok(None),
Some(x) if x == "CRC32" => Ok(Some(ChecksumAlgorithm::Crc32)),
Some(x) if x == "CRC32C" => Ok(Some(ChecksumAlgorithm::Crc32c)),
Some(x) if x == "SHA1" => Ok(Some(ChecksumAlgorithm::Sha1)),
Some(x) if x == "SHA256" => Ok(Some(ChecksumAlgorithm::Sha256)),
_ => Err(Error::bad_request("invalid checksum algorithm")),
}
}
/// Extract the value of any of the x-amz-checksum-* headers
pub(crate) fn request_checksum_value(
headers: &HeaderMap<HeaderValue>,
) -> Result<Option<ChecksumValue>, Error> {
let mut ret = vec![];
if let Some(crc32_str) = headers.get(X_AMZ_CHECKSUM_CRC32) {
let crc32 = BASE64_STANDARD
.decode(&crc32_str)
.ok()
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-crc32 header")?;
ret.push(ChecksumValue::Crc32(crc32))
}
if let Some(crc32c_str) = headers.get(X_AMZ_CHECKSUM_CRC32C) {
let crc32c = BASE64_STANDARD
.decode(&crc32c_str)
.ok()
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-crc32c header")?;
ret.push(ChecksumValue::Crc32c(crc32c))
}
if let Some(sha1_str) = headers.get(X_AMZ_CHECKSUM_SHA1) {
let sha1 = BASE64_STANDARD
.decode(&sha1_str)
.ok()
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-sha1 header")?;
ret.push(ChecksumValue::Sha1(sha1))
}
if let Some(sha256_str) = headers.get(X_AMZ_CHECKSUM_SHA256) {
let sha256 = BASE64_STANDARD
.decode(&sha256_str)
.ok()
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-sha256 header")?;
ret.push(ChecksumValue::Sha256(sha256))
}
if ret.len() > 1 {
return Err(Error::bad_request(
"multiple x-amz-checksum-* headers given",
));
}
Ok(ret.pop())
}
/// Checks for the presence of x-amz-checksum-algorithm
/// if so extract the corresponding x-amz-checksum-* value
pub(crate) fn request_checksum_algorithm_value(
headers: &HeaderMap<HeaderValue>,
) -> Result<Option<ChecksumValue>, Error> {
match headers.get(X_AMZ_CHECKSUM_ALGORITHM) {
Some(x) if x == "CRC32" => {
let crc32 = headers
.get(X_AMZ_CHECKSUM_CRC32)
.and_then(|x| BASE64_STANDARD.decode(&x).ok())
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-crc32 header")?;
Ok(Some(ChecksumValue::Crc32(crc32)))
}
Some(x) if x == "CRC32C" => {
let crc32c = headers
.get(X_AMZ_CHECKSUM_CRC32C)
.and_then(|x| BASE64_STANDARD.decode(&x).ok())
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-crc32c header")?;
Ok(Some(ChecksumValue::Crc32c(crc32c)))
}
Some(x) if x == "SHA1" => {
let sha1 = headers
.get(X_AMZ_CHECKSUM_SHA1)
.and_then(|x| BASE64_STANDARD.decode(&x).ok())
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-sha1 header")?;
Ok(Some(ChecksumValue::Sha1(sha1)))
}
Some(x) if x == "SHA256" => {
let sha256 = headers
.get(X_AMZ_CHECKSUM_SHA256)
.and_then(|x| BASE64_STANDARD.decode(&x).ok())
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-sha256 header")?;
Ok(Some(ChecksumValue::Sha256(sha256)))
}
Some(_) => Err(Error::bad_request("invalid x-amz-checksum-algorithm")),
None => Ok(None),
}
}
pub(crate) fn add_checksum_response_headers(
checksum: &Option<ChecksumValue>,
mut resp: http::response::Builder,
) -> http::response::Builder {
match checksum {
Some(ChecksumValue::Crc32(crc32)) => {
resp = resp.header(X_AMZ_CHECKSUM_CRC32, BASE64_STANDARD.encode(&crc32));
}
Some(ChecksumValue::Crc32c(crc32c)) => {
resp = resp.header(X_AMZ_CHECKSUM_CRC32C, BASE64_STANDARD.encode(&crc32c));
}
Some(ChecksumValue::Sha1(sha1)) => {
resp = resp.header(X_AMZ_CHECKSUM_SHA1, BASE64_STANDARD.encode(&sha1));
}
Some(ChecksumValue::Sha256(sha256)) => {
resp = resp.header(X_AMZ_CHECKSUM_SHA256, BASE64_STANDARD.encode(&sha256));
}
None => (),
}
resp
}
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