use std::collections::{BTreeMap, BTreeSet, VecDeque};
use std::sync::Arc;
use futures::prelude::*;
use hyper::body::{Body, Bytes};
use hyper::header::{HeaderMap, HeaderValue};
use hyper::{Request, Response};
use md5::{digest::generic_array::*, Digest as Md5Digest, Md5};
use sha2::Sha256;
use garage_table::*;
use garage_util::data::*;
use garage_util::error::Error as GarageError;
use garage_util::time::*;
use garage_block::manager::INLINE_THRESHOLD;
use garage_model::garage::Garage;
use garage_model::s3::block_ref_table::*;
use garage_model::s3::object_table::*;
use garage_model::s3::version_table::*;
use crate::error::*;
use crate::s3::xml as s3_xml;
use crate::signature::verify_signed_content;
pub async fn handle_put(
garage: Arc<Garage>,
req: Request<Body>,
bucket_id: Uuid,
key: &str,
content_sha256: Option<Hash>,
) -> Result<Response<Body>, Error> {
// Retrieve interesting headers from request
let headers = get_headers(req.headers())?;
debug!("Object headers: {:?}", headers);
let content_md5 = match req.headers().get("content-md5") {
Some(x) => Some(x.to_str()?.to_string()),
None => None,
};
let (_head, body) = req.into_parts();
let body = body.map_err(Error::from);
save_stream(
garage,
headers,
body,
bucket_id,
key,
content_md5,
content_sha256,
)
.await
.map(|(uuid, md5)| put_response(uuid, md5))
}
pub(crate) async fn save_stream<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
garage: Arc<Garage>,
headers: ObjectVersionHeaders,
body: S,
bucket_id: Uuid,
key: &str,
content_md5: Option<String>,
content_sha256: Option<FixedBytes32>,
) -> Result<(Uuid, String), Error> {
// Generate identity of new version
let version_uuid = gen_uuid();
let version_timestamp = now_msec();
let mut chunker = StreamChunker::new(body, garage.config.block_size);
let first_block = chunker.next().await?.unwrap_or_default();
// 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 data_md5sum = md5sum.finalize();
let data_md5sum_hex = hex::encode(data_md5sum);
let data_sha256sum = sha256sum(&first_block[..]);
ensure_checksum_matches(
data_md5sum.as_slice(),
data_sha256sum,
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: data_md5sum_hex.clone(),
},
first_block,
)),
};
let object = Object::new(bucket_id, key.into(), vec![object_version]);
garage.object_table.insert(&object).await?;
return Ok((version_uuid, data_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: version_timestamp,
state: ObjectVersionState::Uploading(headers.clone()),
};
let object = Object::new(bucket_id, key.into(), vec![object_version.clone()]);
garage.object_table.insert(&object).await?;
// Initialize corresponding entry in version table
// Write this entry now, even with empty block list,
// to prevent block_ref entries from being deleted (they can be deleted
// if the reference a version that isn't found in the version table)
let version = Version::new(version_uuid, bucket_id, key.into(), false);
garage.version_table.insert(&version).await?;
// Transfer data and verify checksum
let first_block_hash = blake2sum(&first_block[..]);
let tx_result = read_and_put_blocks(
&garage,
&version,
1,
first_block,
first_block_hash,
&mut chunker,
)
.await
.and_then(|(total_size, data_md5sum, data_sha256sum)| {
ensure_checksum_matches(
data_md5sum.as_slice(),
data_sha256sum,
content_md5.as_deref(),
content_sha256,
)
.map(|()| (total_size, data_md5sum))
});
// 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_id, 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_id, key.into(), vec![object_version]);
garage.object_table.insert(&object).await?;
Ok((version_uuid, md5sum_hex))
}
/// Validate MD5 sum against content-md5 header
/// and sha256sum against signed content-sha256
fn ensure_checksum_matches(
data_md5sum: &[u8],
data_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 != data_sha256sum {
return Err(Error::BadRequest(
"Unable to validate x-amz-content-sha256".to_string(),
));
} else {
trace!("Successfully validated x-amz-content-sha256");
}
}
if let Some(expected_md5) = content_md5 {
if expected_md5.trim_matches('"') != base64::encode(data_md5sum) {
return Err(Error::BadRequest(
"Unable to validate content-md5".to_string(),
));
} else {
trace!("Successfully validated content-md5");
}
}
Ok(())
}
async fn read_and_put_blocks<S: Stream<Item = Result<Bytes, Error>> + Unpin>(
garage: &Garage,
version: &Version,
part_number: u64,
first_block: Vec<u8>,
first_block_hash: Hash,
chunker: &mut StreamChunker<S>,
) -> Result<(u64, GenericArray<u8, typenum::U16>, Hash), Error> {
let mut md5hasher = Md5::new();
let mut sha256hasher = Sha256::new();
md5hasher.update(&first_block[..]);
sha256hasher.update(&first_block[..]);
let mut next_offset = first_block.len();
let mut put_curr_version_block = put_block_meta(
garage,
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.map_err(Error::from),
put_curr_version_block.map_err(Error::from),
chunker.next(),
)?;
if let Some(block) = next_block {
md5hasher.update(&block[..]);
sha256hasher.update(&block[..]);
let block_hash = blake2sum(&block[..]);
let block_len = block.len();
put_curr_version_block = put_block_meta(
garage,
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 data_md5sum = md5hasher.finalize();
let data_sha256sum = sha256hasher.finalize();
let data_sha256sum = Hash::try_from(&data_sha256sum[..]).unwrap();
Ok((total_size, data_md5sum, data_sha256sum))
}
async fn put_block_meta(
garage: &Garage,
version: &Version,
part_number: u64,
offset: u64,
hash: Hash,
size: u64,
) -> Result<(), GarageError> {
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 StreamChunker<S: Stream<Item = Result<Bytes, Error>>> {
stream: S,
read_all: bool,
block_size: usize,
buf: VecDeque<u8>,
}
impl<S: Stream<Item = Result<Bytes, Error>> + Unpin> StreamChunker<S> {
fn new(stream: S, block_size: usize) -> Self {
Self {
stream,
read_all: false,
block_size,
buf: VecDeque::with_capacity(2 * block_size),
}
}
async fn next(&mut self) -> Result<Option<Vec<u8>>, Error> {
while !self.read_all && self.buf.len() < self.block_size {
if let Some(block) = self.stream.next().await {
let bytes = block?;
trace!("Body next: {} bytes", bytes.len());
self.buf.extend(bytes);
} else {
self.read_all = true;
}
}
if self.buf.is_empty() {
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_name: &str,
bucket_id: Uuid,
key: &str,
) -> Result<Response<Body>, Error> {
let version_uuid = gen_uuid();
let headers = get_headers(req.headers())?;
// Create object in object table
let object_version = ObjectVersion {
uuid: version_uuid,
timestamp: now_msec(),
state: ObjectVersionState::Uploading(headers),
};
let object = Object::new(bucket_id, key.to_string(), vec![object_version]);
garage.object_table.insert(&object).await?;
// Insert empty version so that block_ref entries refer to something
// (they are inserted concurrently with blocks in the version table, so
// there is the possibility that they are inserted before the version table
// is created, in which case it is allowed to delete them, e.g. in repair_*)
let version = Version::new(version_uuid, bucket_id, key.into(), false);
garage.version_table.insert(&version).await?;
// Send success response
let result = s3_xml::InitiateMultipartUploadResult {
xmlns: (),
bucket: s3_xml::Value(bucket_name.to_string()),
key: s3_xml::Value(key.to_string()),
upload_id: s3_xml::Value(hex::encode(version_uuid)),
};
let xml = s3_xml::to_xml_with_header(&result)?;
Ok(Response::new(Body::from(xml.into_bytes())))
}
pub async fn handle_put_part(
garage: Arc<Garage>,
req: Request<Body>,
bucket_id: Uuid,
key: &str,
part_number: u64,
upload_id: &str,
content_sha256: Option<Hash>,
) -> Result<Response<Body>, Error> {
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 key = key.to_string();
let body = req.into_body().map_err(Error::from);
let mut chunker = StreamChunker::new(body, garage.config.block_size);
let (object, version, first_block) = futures::try_join!(
garage
.object_table
.get(&bucket_id, &key)
.map_err(Error::from),
garage
.version_table
.get(&version_uuid, &EmptyKey)
.map_err(Error::from),
chunker.next(),
)?;
// Check object is valid and multipart block can be accepted
let first_block = first_block.ok_or_bad_request("Empty body")?;
let object = object.ok_or_bad_request("Object not found")?;
if !object
.versions()
.iter()
.any(|v| v.uuid == version_uuid && v.is_uploading())
{
return Err(Error::NoSuchUpload);
}
// Check part hasn't already been uploaded
if let Some(v) = version {
if v.has_part_number(part_number) {
return Err(Error::BadRequest(format!(
"Part number {} has already been uploaded",
part_number
)));
}
}
// Copy block to store
let version = Version::new(version_uuid, bucket_id, key, false);
let first_block_hash = blake2sum(&first_block[..]);
let (_, data_md5sum, data_sha256sum) = read_and_put_blocks(
&garage,
&version,
part_number,
first_block,
first_block_hash,
&mut chunker,
)
.await?;
// Verify that checksums map
ensure_checksum_matches(
data_md5sum.as_slice(),
data_sha256sum,
content_md5.as_deref(),
content_sha256,
)?;
// Store part etag in version
let data_md5sum_hex = hex::encode(data_md5sum);
let mut version = version;
version
.parts_etags
.put(part_number, data_md5sum_hex.clone());
garage.version_table.insert(&version).await?;
let response = Response::builder()
.header("ETag", format!("\"{}\"", data_md5sum_hex))
.body(Body::empty())
.unwrap();
Ok(response)
}
pub async fn handle_complete_multipart_upload(
garage: Arc<Garage>,
req: Request<Body>,
bucket_name: &str,
bucket_id: Uuid,
key: &str,
upload_id: &str,
content_sha256: Option<Hash>,
) -> Result<Response<Body>, Error> {
let body = hyper::body::to_bytes(req.into_body()).await?;
if let Some(content_sha256) = content_sha256 {
verify_signed_content(content_sha256, &body[..])?;
}
let body_xml = roxmltree::Document::parse(std::str::from_utf8(&body)?)?;
let body_list_of_parts = parse_complete_multipart_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)?;
// Get object and version
let key = key.to_string();
let (object, version) = futures::try_join!(
garage.object_table.get(&bucket_id, &key),
garage.version_table.get(&version_uuid, &EmptyKey),
)?;
let object = object.ok_or(Error::NoSuchKey)?;
let mut object_version = object
.versions()
.iter()
.find(|v| v.uuid == version_uuid && v.is_uploading())
.cloned()
.ok_or(Error::NoSuchUpload)?;
let version = version.ok_or(Error::NoSuchKey)?;
if version.blocks.is_empty() {
return Err(Error::BadRequest("No data was uploaded".to_string()));
}
let headers = match object_version.state {
ObjectVersionState::Uploading(headers) => headers,
_ => unreachable!(),
};
// Check that part numbers are an increasing sequence.
// (it doesn't need to start at 1 nor to be a continuous sequence,
// see discussion in #192)
if body_list_of_parts.is_empty() {
return Err(Error::EntityTooSmall);
}
if !body_list_of_parts
.iter()
.zip(body_list_of_parts.iter().skip(1))
.all(|(p1, p2)| p1.part_number < p2.part_number)
{
return Err(Error::InvalidPartOrder);
}
// Garage-specific restriction, see #204: part numbers must be
// consecutive starting at 1
if body_list_of_parts[0].part_number != 1
|| !body_list_of_parts
.iter()
.zip(body_list_of_parts.iter().skip(1))
.all(|(p1, p2)| p1.part_number + 1 == p2.part_number)
{
return Err(Error::NotImplemented("Garage does not support completing a Multipart upload with non-consecutive part numbers. This is a restriction of Garage's data model, which might be fixed in a future release. See issue #204 for more information on this topic.".into()));
}
// Check that the list of parts they gave us corresponds to the parts we have here
debug!("Expected parts from request: {:?}", body_list_of_parts);
debug!("Parts stored in version: {:?}", version.parts_etags.items());
let parts = version
.parts_etags
.items()
.iter()
.map(|pair| (&pair.0, &pair.1));
let same_parts = body_list_of_parts
.iter()
.map(|x| (&x.part_number, &x.etag))
.eq(parts);
if !same_parts {
return Err(Error::InvalidPart);
}
// Check that all blocks belong to one of the parts
let block_parts = version
.blocks
.items()
.iter()
.map(|(bk, _)| bk.part_number)
.collect::<BTreeSet<_>>();
let same_parts = body_list_of_parts
.iter()
.map(|x| x.part_number)
.eq(block_parts.into_iter());
if !same_parts {
return Err(Error::BadRequest(
"Part numbers in block list and part list do not match. This can happen if a part was partially uploaded. Please abort the multipart upload and try again.".into(),
));
}
// Calculate etag of final object
// To understand how etags are calculated, read more here:
// https://teppen.io/2018/06/23/aws_s3_etags/
let num_parts = body_list_of_parts.len();
let mut etag_md5_hasher = Md5::new();
for (_, etag) in version.parts_etags.items().iter() {
etag_md5_hasher.update(etag.as_bytes());
}
let etag = format!("{}-{}", hex::encode(etag_md5_hasher.finalize()), num_parts);
// Calculate total size of final object
let total_size = version.blocks.items().iter().map(|x| x.1.size).sum();
// Write final object version
object_version.state = ObjectVersionState::Complete(ObjectVersionData::FirstBlock(
ObjectVersionMeta {
headers,
size: total_size,
etag: etag.clone(),
},
version.blocks.items()[0].1.hash,
));
let final_object = Object::new(bucket_id, key.clone(), vec![object_version]);
garage.object_table.insert(&final_object).await?;
// Send response saying ok we're done
let result = s3_xml::CompleteMultipartUploadResult {
xmlns: (),
location: None,
bucket: s3_xml::Value(bucket_name.to_string()),
key: s3_xml::Value(key),
etag: s3_xml::Value(format!("\"{}\"", etag)),
};
let xml = s3_xml::to_xml_with_header(&result)?;
Ok(Response::new(Body::from(xml.into_bytes())))
}
pub async fn handle_abort_multipart_upload(
garage: Arc<Garage>,
bucket_id: Uuid,
key: &str,
upload_id: &str,
) -> Result<Response<Body>, Error> {
let version_uuid = decode_upload_id(upload_id)?;
let object = garage
.object_table
.get(&bucket_id, &key.to_string())
.await?;
let object = object.ok_or(Error::NoSuchKey)?;
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::NoSuchUpload),
Some(x) => x.clone(),
};
object_version.state = ObjectVersionState::Aborted;
let final_object = Object::new(bucket_id, key.to_string(), vec![object_version]);
garage.object_table.insert(&final_object).await?;
Ok(Response::new(Body::from(vec![])))
}
fn get_mime_type(headers: &HeaderMap<HeaderValue>) -> Result<String, Error> {
Ok(headers
.get(hyper::header::CONTENT_TYPE)
.map(|x| x.to_str())
.unwrap_or(Ok("blob"))?
.to_string())
}
pub(crate) fn get_headers(headers: &HeaderMap<HeaderValue>) -> Result<ObjectVersionHeaders, Error> {
let content_type = get_mime_type(headers)?;
let mut other = BTreeMap::new();
// Preserve standard headers
let standard_header = vec![
hyper::header::CACHE_CONTROL,
hyper::header::CONTENT_DISPOSITION,
hyper::header::CONTENT_ENCODING,
hyper::header::CONTENT_LANGUAGE,
hyper::header::EXPIRES,
];
for h in standard_header.iter() {
if let Some(v) = 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);
}
}
}
}
// Preserve x-amz-meta- headers
for (k, v) in headers.iter() {
if k.as_str().starts_with("x-amz-meta-") {
match v.to_str() {
Ok(v_str) => {
other.insert(k.to_string(), v_str.to_string());
}
Err(e) => {
warn!("Discarding header {}, error in .to_str(): {}", k, e);
}
}
}
}
Ok(ObjectVersionHeaders {
content_type,
other,
})
}
pub fn decode_upload_id(id: &str) -> Result<Uuid, Error> {
let id_bin = hex::decode(id).map_err(|_| Error::NoSuchUpload)?;
if id_bin.len() != 32 {
return Err(Error::NoSuchUpload);
}
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_multipart_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() {
// Only parse <Part> nodes
if !item.is_element() {
continue;
}
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)
}
