Some basic S3 functionnality

1 files changed, 112 insertions, 0 deletions

diff --git a/src/api/s3_list.rs b/src/api/s3_list.rs
new file mode 100644
index 00000000..6004bff0
--- /dev/null
+++ b/src/api/s3_list.rs
@@ -0,0 +1,112 @@
+use std::collections::BTreeMap;
+use std::fmt::Write;
+use std::sync::Arc;
+
+use chrono::{DateTime, NaiveDateTime, Utc, SecondsFormat};
+use hyper::Response;
+
+use garage_util::error::Error;
+
+use garage_core::garage::Garage;
+use garage_core::object_table::*;
+
+use crate::api_server::BodyType;
+use crate::http_util::*;
+
+#[derive(Debug)]
+struct ListResultInfo {
+	last_modified: u64,
+	size: u64,
+}
+
+pub async fn handle_list(
+	garage: Arc<Garage>,
+	bucket: &str,
+	delimiter: &str,
+	max_keys: usize,
+	prefix: &str,
+) -> Result<Response<BodyType>, Error> {
+	let mut result = BTreeMap::<String, ListResultInfo>::new();
+	let mut truncated = true;
+	let mut next_chunk_start = prefix.to_string();
+
+	println!("List request: `{}` {} `{}`", delimiter, max_keys, prefix);
+
+	while result.len() < max_keys && truncated {
+		let objects = garage
+			.object_table
+			.get_range(
+				&bucket.to_string(),
+				Some(next_chunk_start.clone()),
+				Some(()),
+				max_keys,
+			)
+			.await?;
+		for object in objects.iter() {
+			if let Some(version) = object
+				.versions()
+				.iter()
+				.find(|x| x.is_complete && x.data != ObjectVersionData::DeleteMarker)
+			{
+				let relative_key = match object.key.starts_with(prefix) {
+					true => &object.key[prefix.len()..],
+					false => {
+						truncated = false;
+						break;
+					}
+				};
+				let delimited_key = match relative_key.find(delimiter) {
+					Some(i) => relative_key.split_at(i).1,
+					None => &relative_key,
+				};
+				let delimited_key = delimited_key.to_string();
+				let new_info = match result.get(&delimited_key) {
+					None => ListResultInfo {
+						last_modified: version.timestamp,
+						size: version.size,
+					},
+					Some(lri) => ListResultInfo {
+						last_modified: std::cmp::max(version.timestamp, lri.last_modified),
+						size: 0,
+					},
+				};
+				println!("Entry: {} {:?}", delimited_key, new_info);
+				result.insert(delimited_key, new_info);
+			}
+		}
+		if objects.len() < max_keys {
+			truncated = false;
+		}
+		if objects.len() > 0 {
+			next_chunk_start = objects[objects.len() - 1].key.clone();
+		}
+	}
+
+	let mut xml = String::new();
+	writeln!(&mut xml, r#"<?xml version="1.0" encoding="UTF-8"?>"#).unwrap();
+	writeln!(
+		&mut xml,
+		r#"<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">"#
+	)
+	.unwrap();
+	writeln!(&mut xml, "\t<Bucket>{}</Bucket>", bucket).unwrap();
+	writeln!(&mut xml, "\t<Prefix>{}</Prefix>", prefix).unwrap();
+	writeln!(&mut xml, "\t<KeyCount>{}</KeyCount>", result.len()).unwrap();
+	writeln!(&mut xml, "\t<MaxKeys>{}</MaxKeys>", max_keys).unwrap();
+	writeln!(&mut xml, "\t<IsTruncated>{}</IsTruncated>", truncated).unwrap();
+	for (key, info) in result.iter() {
+		let last_modif = NaiveDateTime::from_timestamp(info.last_modified as i64 / 1000, 0);
+		let last_modif = DateTime::<Utc>::from_utc(last_modif, Utc);
+		let last_modif = last_modif.to_rfc3339_opts(SecondsFormat::Millis, true);
+		writeln!(&mut xml, "\t<Contents>").unwrap();
+		writeln!(&mut xml, "\t\t<Key>{}</Key>", key).unwrap();
+		writeln!(&mut xml, "\t\t<LastModified>{}</LastModified>", last_modif).unwrap();
+		writeln!(&mut xml, "\t\t<Size>{}</Size>", info.size).unwrap();
+		writeln!(&mut xml, "\t\t<StorageClass>STANDARD</StorageClass>").unwrap();
+		writeln!(&mut xml, "\t</Contents>").unwrap();
+	}
+	writeln!(&mut xml, "</ListBucketResult>").unwrap();
+	println!("{}", xml);
+
+	Ok(Response::new(Box::new(BytesBody::from(xml.into_bytes()))))
+}