garage/src/api/s3_delete.rs

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Rust
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use std::fmt::Write;
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use std::sync::Arc;
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use hyper::{Body, Request, Response};
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use garage_util::data::*;
use garage_util::error::Error;
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use garage_model::garage::Garage;
use garage_model::object_table::*;
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use crate::encoding::*;
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async fn handle_delete_internal(
garage: &Garage,
bucket: &str,
key: &str,
) -> Result<(UUID, UUID), Error> {
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let object = match garage
.object_table
.get(&bucket.to_string(), &key.to_string())
.await?
{
None => {
// No need to delete
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return Err(Error::NotFound);
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}
Some(o) => o,
};
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let interesting_versions = object.versions().iter().filter(|v| match v.state {
ObjectVersionState::Aborted => false,
ObjectVersionState::Complete(ObjectVersionData::DeleteMarker) => false,
_ => true,
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});
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let mut must_delete = None;
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let mut timestamp = now_msec();
for v in interesting_versions {
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if v.timestamp + 1 > timestamp || must_delete.is_none() {
must_delete = Some(v.uuid);
}
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timestamp = std::cmp::max(timestamp, v.timestamp + 1);
}
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let deleted_version = match must_delete {
None => return Err(Error::NotFound),
Some(v) => v,
};
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let version_uuid = gen_uuid();
let object = Object::new(
bucket.into(),
key.into(),
vec![ObjectVersion {
uuid: version_uuid,
timestamp: now_msec(),
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state: ObjectVersionState::Complete(ObjectVersionData::DeleteMarker),
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}],
);
garage.object_table.insert(&object).await?;
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return Ok((deleted_version, version_uuid));
}
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pub async fn handle_delete(
garage: Arc<Garage>,
bucket: &str,
key: &str,
) -> Result<Response<Body>, Error> {
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let (_deleted_version, delete_marker_version) =
handle_delete_internal(&garage, bucket, key).await?;
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Ok(Response::builder()
.header("x-amz-version-id", hex::encode(delete_marker_version))
.body(Body::from(vec![]))
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.unwrap())
}
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pub async fn handle_delete_objects(
garage: Arc<Garage>,
bucket: &str,
req: Request<Body>,
) -> Result<Response<Body>, Error> {
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let body = hyper::body::to_bytes(req.into_body()).await?;
let cmd_xml = roxmltree::Document::parse(&std::str::from_utf8(&body)?)?;
let cmd = parse_delete_objects_xml(&cmd_xml)
.map_err(|e| Error::BadRequest(format!("Invald delete XML query: {}", e)))?;
let mut retxml = String::new();
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writeln!(&mut retxml, r#"<?xml version="1.0" encoding="UTF-8"?>"#).unwrap();
writeln!(&mut retxml, "<DeleteObjectsOutput>").unwrap();
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for obj in cmd.objects.iter() {
match handle_delete_internal(&garage, bucket, &obj.key).await {
Ok((deleted_version, delete_marker_version)) => {
writeln!(&mut retxml, "\t<Deleted>").unwrap();
writeln!(&mut retxml, "\t\t<Key>{}</Key>", obj.key).unwrap();
writeln!(
&mut retxml,
"\t\t<VersionId>{}</VersionId>",
hex::encode(deleted_version)
)
.unwrap();
writeln!(
&mut retxml,
"\t\t<DeleteMarkerVersionId>{}</DeleteMarkerVersionId>",
hex::encode(delete_marker_version)
)
.unwrap();
writeln!(&mut retxml, "\t</Deleted>").unwrap();
}
Err(e) => {
writeln!(&mut retxml, "\t<Error>").unwrap();
writeln!(&mut retxml, "\t\t<Code>{}</Code>", e.http_status_code()).unwrap();
writeln!(&mut retxml, "\t\t<Key>{}</Key>", obj.key).unwrap();
writeln!(
&mut retxml,
"\t\t<Message>{}</Message>",
xml_escape(&format!("{}", e))
)
.unwrap();
writeln!(&mut retxml, "\t</Error>").unwrap();
}
}
}
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writeln!(&mut retxml, "</DeleteObjectsOutput>").unwrap();
Ok(Response::new(Body::from(retxml.into_bytes())))
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}
struct DeleteRequest {
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objects: Vec<DeleteObject>,
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}
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struct DeleteObject {
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key: String,
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}
fn parse_delete_objects_xml(xml: &roxmltree::Document) -> Result<DeleteRequest, String> {
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let mut ret = DeleteRequest { objects: vec![] };
let root = xml.root();
let delete = match root.first_child() {
Some(del) => del,
None => return Err(format!("Delete tag not found")),
};
if !delete.has_tag_name("Delete") {
return Err(format!("Invalid root tag: {:?}", root));
}
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for item in delete.children() {
if item.has_tag_name("Object") {
if let Some(key) = item.children().find(|e| e.has_tag_name("Key")) {
if let Some(key_str) = key.text() {
ret.objects.push(DeleteObject {
key: key_str.to_string(),
});
} else {
return Err(format!("No text for key: {:?}", key));
}
} else {
return Err(format!("No delete key for item: {:?}", item));
}
} else {
return Err(format!("Invalid delete item: {:?}", item));
}
}
Ok(ret)
}