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path: root/src/api/s3_delete.rs
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use std::sync::Arc;
use std::fmt::Write;

use hyper::{Body, Request, Response};

use garage_util::data::*;
use garage_util::error::Error;

use garage_core::garage::Garage;
use garage_core::object_table::*;

use crate::http_util::*;
use crate::encoding::*;

async fn handle_delete_internal(garage: &Garage, bucket: &str, key: &str) -> Result<(UUID, UUID), Error> {
	let object = match garage
		.object_table
		.get(&bucket.to_string(), &key.to_string())
		.await?
	{
		None => {
			// No need to delete
			return Err(Error::NotFound);
		}
		Some(o) => o,
	};

	let interesting_versions = object.versions().iter().filter(|v| {
		v.data != ObjectVersionData::DeleteMarker && v.state != ObjectVersionState::Aborted
	});

	let mut must_delete = None;
	let mut timestamp = now_msec();
	for v in interesting_versions {
        if v.timestamp + 1 > timestamp || must_delete.is_none() {
		    must_delete = Some(v.uuid);
        }
		timestamp = std::cmp::max(timestamp, v.timestamp + 1);
	}

    let deleted_version = match must_delete {
        None => return Err(Error::NotFound),
        Some(v) => v,
    };

	let version_uuid = gen_uuid();

	let object = Object::new(
		bucket.into(),
		key.into(),
		vec![ObjectVersion {
			uuid: version_uuid,
			timestamp: now_msec(),
			mime_type: "application/x-delete-marker".into(),
			size: 0,
			state: ObjectVersionState::Complete,
			data: ObjectVersionData::DeleteMarker,
		}],
	);

	garage.object_table.insert(&object).await?;
	return Ok((deleted_version, version_uuid));
}

pub async fn handle_delete(garage: Arc<Garage>, bucket: &str, key: &str) -> Result<Response<BodyType>, Error> {
    let (_deleted_version, delete_marker_version) = handle_delete_internal(&garage, bucket, key).await?;

	Ok(Response::builder()
		.header("x-amz-version-id", hex::encode(delete_marker_version))
		.body(empty_body())
		.unwrap())
}

pub async fn handle_delete_objects(garage: Arc<Garage>, bucket: &str, req: Request<Body>) -> Result<Response<BodyType>, Error> {
    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();
	writeln!(&mut retxml, r#"<?xml version="1.0" encoding="UTF-8"?>"#).unwrap();
	writeln!(&mut retxml, "<DeleteObjectsOutput>").unwrap();

    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();
            }
        }
    }

	writeln!(&mut retxml, "</DeleteObjectsOutput>").unwrap();

	Ok(Response::new(Box::new(BytesBody::from(retxml.into_bytes()))))
}

struct DeleteRequest {
    objects: Vec<DeleteObject>,
}

struct DeleteObject {
    key: String,
}

fn parse_delete_objects_xml(xml: &roxmltree::Document) -> Result<DeleteRequest, String> {
    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));
    }

    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)
}