use std::collections::{BTreeMap, VecDeque};
use std::fmt::Write;
use std::sync::Arc;
use futures::stream::*;
use hyper::{Body, Request, Response};
use md5::{digest::generic_array::*, Digest as Md5Digest, Md5};
use sha2::{Digest as Sha256Digest, Sha256};
use garage_table::*;
use garage_util::data::*;
use garage_util::error::Error as GarageError;
use garage_model::block::INLINE_THRESHOLD;
use garage_model::block_ref_table::*;
use garage_model::garage::Garage;
use garage_model::object_table::*;
use garage_model::version_table::*;
use crate::encoding::*;
use crate::error::*;
use crate::signature::verify_signed_content;
pub async fn handle_put(
garage: Arc<Garage>,
req: Request<Body>,
bucket: &str,
key: &str,
content_sha256: Option<Hash>,
) -> Result<Response<Body>, Error> {
// Generate identity of new version
let version_uuid = gen_uuid();
let version_timestamp = now_msec();
// Retrieve interesting headers from request
let headers = get_headers(&req)?;
debug!("Object headers: {:?}", headers);
let content_md5 = match req.headers().get("content-md5") {
Some(x) => Some(x.to_str()?.to_string()),
None => None,
};
// Parse body of uploaded file
let body = req.into_body();
let mut chunker = BodyChunker::new(body, garage.config.block_size);
let first_block = chunker.next().await?.unwrap_or(vec![]);
// If body is small enough, store it directly in the object table
// as "inline data". We can then return immediately.
if first_block.len() < INLINE_THRESHOLD {
let mut md5sum = Md5::new();
md5sum.update(&first_block[..]);
let md5sum_arr = md5sum.finalize();
let md5sum_hex = hex::encode(md5sum_arr);
let sha256sum_hash = sha256sum(&first_block[..]);
ensure_checksum_matches(
md5sum_arr.as_slice(),
sha256sum_hash,
content_md5.as_deref(),
content_sha256,
)?;
let object_version = ObjectVersion {
uuid: version_uuid,
timestamp: version_timestamp,
state: ObjectVersionState::Complete(ObjectVersionData::Inline(
ObjectVersionMeta {
headers,
size: first_block.len() as u64,
etag: md5sum_hex.clone(),
},
first_block,
)),
};
let object = Object::new(bucket.into(), key.into(), vec![object_version]);
garage.object_table.insert(&object).await?;
return Ok(put_response(version_uuid, md5sum_hex));
}
// Write version identifier in object table so that we have a trace
// that we are uploading something
let mut object_version = ObjectVersion {
uuid: version_uuid,
timestamp: now_msec(),
state: ObjectVersionState::Uploading(headers.clone()),
};
let object = Object::new(bucket.into(), key.into(), vec![object_version.clone()]);
garage.object_table.insert(&object).await?;
// Initialize corresponding entry in version table
let version = Version::new(version_uuid, bucket.into(), key.into(), false);
let first_block_hash = sha256sum(&first_block[..]);
// Transfer data and verify checksum
let tx_result = read_and_put_blocks(
&garage,
version,
1,
first_block,
first_block_hash,
&mut chunker,
)
.await
.and_then(|(total_size, md5sum_arr, sha256sum)| {
ensure_checksum_matches(
md5sum_arr.as_slice(),
sha256sum,
content_md5.as_deref(),
content_sha256,
)
.map(|()| (total_size, md5sum_arr))
});
// If something went wrong, clean up
let (total_size, md5sum_arr) = match tx_result {
Ok(rv) => rv,
Err(e) => {
// Mark object as aborted, this will free the blocks further down
object_version.state = ObjectVersionState::Aborted;
let object = Object::new(bucket.into(), key.into(), vec![object_version.clone()]);
garage.object_table.insert(&object).await?;
return Err(e);
}
};
// Save final object state, marked as Complete
let md5sum_hex = hex::encode(md5sum_arr);
object_version.state = ObjectVersionState::Complete(ObjectVersionData::FirstBlock(
ObjectVersionMeta {
headers,
size: total_size,
etag: md5sum_hex.clone(),
},
first_block_hash,
));
let object = Object::new(bucket.into(), key.into(), vec![object_version]);
garage.object_table.insert(&object).await?;
Ok(put_response(version_uuid, md5sum_hex))
}
/// Validate MD5 sum against content-md5 header
/// and sha256sum against signed content-sha256
fn ensure_checksum_matches(
md5sum: &[u8],
sha256sum: garage_util::data::FixedBytes32,
content_md5: Option<&str>,
content_sha256: Option<garage_util::data::FixedBytes32>,
) -> Result<(), Error> {
if let Some(expected_sha256) = content_sha256 {
if expected_sha256 != sha256sum {
return Err(Error::BadRequest(format!(
"Unable to validate x-amz-content-sha256"
)));
} else {
trace!("Successfully validated x-amz-content-sha256");
}
}
if let Some(expected_md5) = content_md5 {
if expected_md5.trim_matches('"') != base64::encode(md5sum) {
return Err(Error::BadRequest(format!("Unable to validate content-md5")));
} else {
trace!("Successfully validated content-md5");
}
}
Ok(())
}
async fn read_and_put_blocks(
garage: &Arc<Garage>,
version: Version,
part_number: u64,
first_block: Vec<u8>,
first_block_hash: Hash,
chunker: &mut BodyChunker,
) -> Result<(u64, GenericArray<u8, typenum::U16>, Hash), Error> {
let mut md5hasher = Md5::new();
let mut sha256hasher = Sha256::new();
md5hasher.update(&first_block[..]);
sha256hasher.input(&first_block[..]);
let mut next_offset = first_block.len();
let mut put_curr_version_block = put_block_meta(
garage.clone(),
&version,
part_number,
0,
first_block_hash,
first_block.len() as u64,
);
let mut put_curr_block = garage
.block_manager
.rpc_put_block(first_block_hash, first_block);
loop {
let (_, _, next_block) =
futures::try_join!(put_curr_block, put_curr_version_block, chunker.next())?;
if let Some(block) = next_block {
md5hasher.update(&block[..]);
sha256hasher.input(&block[..]);
let block_hash = sha256sum(&block[..]);
let block_len = block.len();
put_curr_version_block = put_block_meta(
garage.clone(),
&version,
part_number,
next_offset as u64,
block_hash,
block_len as u64,
);
put_curr_block = garage.block_manager.rpc_put_block(block_hash, block);
next_offset += block_len;
} else {
break;
}
}
let total_size = next_offset as u64;
let md5sum_arr = md5hasher.finalize();
let sha256sum_arr = sha256hasher.result();
let mut hash = [0u8; 32];
hash.copy_from_slice(&sha256sum_arr[..]);
let sha256sum_arr = Hash::from(hash);
Ok((total_size, md5sum_arr, sha256sum_arr))
}
async fn put_block_meta(
garage: Arc<Garage>,
version: &Version,
part_number: u64,
offset: u64,
hash: Hash,
size: u64,
) -> Result<(), GarageError> {
// TODO: don't clone, restart from empty block list ??
let mut version = version.clone();
version.blocks.put(
VersionBlockKey {
part_number,
offset,
},
VersionBlock { hash, size },
);
let block_ref = BlockRef {
block: hash,
version: version.uuid,
deleted: false.into(),
};
futures::try_join!(
garage.version_table.insert(&version),
garage.block_ref_table.insert(&block_ref),
)?;
Ok(())
}
struct BodyChunker {
body: Body,
read_all: bool,
block_size: usize,
buf: VecDeque<u8>,
}
impl BodyChunker {
fn new(body: Body, block_size: usize) -> Self {
Self {
body,
read_all: false,
block_size,
buf: VecDeque::with_capacity(2 * block_size),
}
}
async fn next(&mut self) -> Result<Option<Vec<u8>>, GarageError> {
while !self.read_all && self.buf.len() < self.block_size {
if let Some(block) = self.body.next().await {
let bytes = block?;
trace!("Body next: {} bytes", bytes.len());
self.buf.extend(&bytes[..]);
} else {
self.read_all = true;
}
}
if self.buf.len() == 0 {
Ok(None)
} else if self.buf.len() <= self.block_size {
let block = self.buf.drain(..).collect::<Vec<u8>>();
Ok(Some(block))
} else {
let block = self.buf.drain(..self.block_size).collect::<Vec<u8>>();
Ok(Some(block))
}
}
}
pub fn put_response(version_uuid: UUID, md5sum_hex: String) -> Response<Body> {
Response::builder()
.header("x-amz-version-id", hex::encode(version_uuid))
.header("ETag", format!("\"{}\"", md5sum_hex))
.body(Body::from(vec![]))
.unwrap()
}
pub async fn handle_create_multipart_upload(
garage: Arc<Garage>,
req: &Request<Body>,
bucket: &str,
key: &str,
) -> Result<Response<Body>, Error> {
let version_uuid = gen_uuid();
let headers = get_headers(req)?;
let object_version = ObjectVersion {
uuid: version_uuid,
timestamp: now_msec(),
state: ObjectVersionState::Uploading(headers),
};
let object = Object::new(bucket.to_string(), key.to_string(), vec![object_version]);
garage.object_table.insert(&object).await?;
let mut xml = String::new();
writeln!(&mut xml, r#"<?xml version="1.0" encoding="UTF-8"?>"#).unwrap();
writeln!(
&mut xml,
r#"<InitiateMultipartUploadResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">"#
)
.unwrap();
writeln!(&mut xml, "\t<Bucket>{}</Bucket>", bucket).unwrap();
writeln!(&mut xml, "\t<Key>{}</Key>", xml_escape(key)).unwrap();
writeln!(
&mut xml,
"\t<UploadId>{}</UploadId>",
hex::encode(version_uuid)
)
.unwrap();
writeln!(&mut xml, "</InitiateMultipartUploadResult>").unwrap();
Ok(Response::new(Body::from(xml.into_bytes())))
}
pub async fn handle_put_part(
garage: Arc<Garage>,
req: Request<Body>,
bucket: &str,
key: &str,
part_number_str: &str,
upload_id: &str,
content_sha256: Option<Hash>,
) -> Result<Response<Body>, Error> {
// Check parameters
let part_number = part_number_str
.parse::<u64>()
.ok_or_bad_request("Invalid part number")?;
let version_uuid = decode_upload_id(upload_id)?;
let content_md5 = match req.headers().get("content-md5") {
Some(x) => Some(x.to_str()?.to_string()),
None => None,
};
// Read first chuck, and at the same time try to get object to see if it exists
let bucket = bucket.to_string();
let key = key.to_string();
let mut chunker = BodyChunker::new(req.into_body(), garage.config.block_size);
let (object, first_block) =
futures::try_join!(garage.object_table.get(&bucket, &key), chunker.next(),)?;
// Check object is valid and multipart block can be accepted
let first_block = first_block.ok_or(Error::BadRequest(format!("Empty body")))?;
let object = object.ok_or(Error::BadRequest(format!("Object not found")))?;
if !object
.versions()
.iter()
.any(|v| v.uuid == version_uuid && v.is_uploading())
{
return Err(Error::NotFound);
}
// Copy block to store
let version = Version::new(version_uuid, bucket, key, false);
let first_block_hash = sha256sum(&first_block[..]);
let (_, md5sum_arr, sha256sum) = read_and_put_blocks(
&garage,
version,
part_number,
first_block,
first_block_hash,
&mut chunker,
)
.await?;
ensure_checksum_matches(
md5sum_arr.as_slice(),
sha256sum,
content_md5.as_deref(),
content_sha256,
)?;
let response = Response::builder()
.header("ETag", format!("\"{}\"", hex::encode(md5sum_arr)))
.body(Body::from(vec![]))
.unwrap();
Ok(response)
}
pub async fn handle_complete_multipart_upload(
garage: Arc<Garage>,
req: Request<Body>,
bucket: &str,
key: &str,
upload_id: &str,
content_sha256: Option<Hash>,
) -> Result<Response<Body>, Error> {
let body = hyper::body::to_bytes(req.into_body()).await?;
verify_signed_content(content_sha256, &body[..])?;
let body_xml = roxmltree::Document::parse(&std::str::from_utf8(&body)?)?;
let body_list_of_parts = parse_complete_multpart_upload_body(&body_xml)
.ok_or_bad_request("Invalid CompleteMultipartUpload XML")?;
debug!(
"CompleteMultipartUpload list of parts: {:?}",
body_list_of_parts
);
let version_uuid = decode_upload_id(upload_id)?;
let bucket = bucket.to_string();
let key = key.to_string();
let (object, version) = futures::try_join!(
garage.object_table.get(&bucket, &key),
garage.version_table.get(&version_uuid, &EmptyKey),
)?;
let object = object.ok_or(Error::BadRequest(format!("Object not found")))?;
let object_version = object
.versions()
.iter()
.find(|v| v.uuid == version_uuid && v.is_uploading());
let mut object_version = match object_version {
None => return Err(Error::NotFound),
Some(x) => x.clone(),
};
let version = version.ok_or(Error::BadRequest(format!("Version not found")))?;
if version.blocks.len() == 0 {
return Err(Error::BadRequest(format!("No data was uploaded")));
}
let headers = match object_version.state {
ObjectVersionState::Uploading(headers) => headers.clone(),
_ => unreachable!(),
};
// Check that the list of parts they gave us corresponds to the parts we have here
// TODO: check MD5 sum of all uploaded parts? but that would mean we have to store them somewhere...
let mut parts = version
.blocks
.items()
.iter()
.map(|x| x.0.part_number)
.collect::<Vec<_>>();
parts.dedup();
let same_parts = body_list_of_parts
.iter()
.map(|x| &x.part_number)
.eq(parts.iter());
if !same_parts {
return Err(Error::BadRequest(format!("We don't have the same parts")));
}
// ETag calculation: we produce ETags that have the same form as
// those of S3 multipart uploads, but we don't use their actual
// calculation for the first part (we use random bytes). This
// shouldn't impact compatibility as the S3 docs specify that
// the ETag is an opaque value in case of a multipart upload.
// See also: https://teppen.io/2018/06/23/aws_s3_etags/
let num_parts = version.blocks.items().last().unwrap().0.part_number
- version.blocks.items().first().unwrap().0.part_number
+ 1;
let etag = format!(
"{}-{}",
hex::encode(&rand::random::<[u8; 16]>()[..]),
num_parts
);
let total_size = version
.blocks
.items()
.iter()
.map(|x| x.1.size)
.fold(0, |x, y| x + y);
object_version.state = ObjectVersionState::Complete(ObjectVersionData::FirstBlock(
ObjectVersionMeta {
headers,
size: total_size,
etag,
},
version.blocks.items()[0].1.hash,
));
let final_object = Object::new(bucket.clone(), key.clone(), vec![object_version]);
garage.object_table.insert(&final_object).await?;
let mut xml = String::new();
writeln!(&mut xml, r#"<?xml version="1.0" encoding="UTF-8"?>"#).unwrap();
writeln!(
&mut xml,
r#"<CompleteMultipartUploadResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">"#
)
.unwrap();
writeln!(
&mut xml,
"\t<Location>{}</Location>",
garage.config.s3_api.s3_region
)
.unwrap();
writeln!(&mut xml, "\t<Bucket>{}</Bucket>", bucket).unwrap();
writeln!(&mut xml, "\t<Key>{}</Key>", xml_escape(&key)).unwrap();
writeln!(&mut xml, "</CompleteMultipartUploadResult>").unwrap();
Ok(Response::new(Body::from(xml.into_bytes())))
}
pub async fn handle_abort_multipart_upload(
garage: Arc<Garage>,
bucket: &str,
key: &str,
upload_id: &str,
) -> Result<Response<Body>, Error> {
let version_uuid = decode_upload_id(upload_id)?;
let object = garage
.object_table
.get(&bucket.to_string(), &key.to_string())
.await?;
let object = object.ok_or(Error::BadRequest(format!("Object not found")))?;
let object_version = object
.versions()
.iter()
.find(|v| v.uuid == version_uuid && v.is_uploading());
let mut object_version = match object_version {
None => return Err(Error::NotFound),
Some(x) => x.clone(),
};
object_version.state = ObjectVersionState::Aborted;
let final_object = Object::new(bucket.to_string(), key.to_string(), vec![object_version]);
garage.object_table.insert(&final_object).await?;
Ok(Response::new(Body::from(vec![])))
}
fn get_mime_type(req: &Request<Body>) -> Result<String, Error> {
Ok(req
.headers()
.get(hyper::header::CONTENT_TYPE)
.map(|x| x.to_str())
.unwrap_or(Ok("blob"))?
.to_string())
}
fn get_headers(req: &Request<Body>) -> Result<ObjectVersionHeaders, Error> {
let content_type = get_mime_type(req)?;
let other_headers = vec![
hyper::header::CACHE_CONTROL,
hyper::header::CONTENT_DISPOSITION,
hyper::header::CONTENT_ENCODING,
hyper::header::CONTENT_LANGUAGE,
hyper::header::EXPIRES,
];
let mut other = BTreeMap::new();
for h in other_headers.iter() {
if let Some(v) = req.headers().get(h) {
match v.to_str() {
Ok(v_str) => {
other.insert(h.to_string(), v_str.to_string());
}
Err(e) => {
warn!("Discarding header {}, error in .to_str(): {}", h, e);
}
}
}
}
Ok(ObjectVersionHeaders {
content_type,
other,
})
}
fn decode_upload_id(id: &str) -> Result<UUID, Error> {
let id_bin = hex::decode(id).ok_or_bad_request("Invalid upload ID")?;
if id_bin.len() != 32 {
return None.ok_or_bad_request("Invalid upload ID");
}
let mut uuid = [0u8; 32];
uuid.copy_from_slice(&id_bin[..]);
Ok(UUID::from(uuid))
}
#[derive(Debug)]
struct CompleteMultipartUploadPart {
etag: String,
part_number: u64,
}
fn parse_complete_multpart_upload_body(
xml: &roxmltree::Document,
) -> Option<Vec<CompleteMultipartUploadPart>> {
let mut parts = vec![];
let root = xml.root();
let cmu = root.first_child()?;
if !cmu.has_tag_name("CompleteMultipartUpload") {
return None;
}
for item in cmu.children() {
if item.has_tag_name("Part") {
let etag = item.children().find(|e| e.has_tag_name("ETag"))?.text()?;
let part_number = item
.children()
.find(|e| e.has_tag_name("PartNumber"))?
.text()?;
parts.push(CompleteMultipartUploadPart {
etag: etag.trim_matches('"').to_string(),
part_number: part_number.parse().ok()?,
});
} else {
return None;
}
}
Some(parts)
}
