1 files changed, 95 insertions, 1 deletions
diff --git a/src/api/s3_get.rs b/src/api/s3_get.rs
index 75478e46..3ed0f914 100644
--- a/src/api/s3_get.rs
+++ b/src/api/s3_get.rs
@@ -3,7 +3,7 @@ use std::time::{Duration, UNIX_EPOCH};
 
 use futures::stream::*;
 use hyper::body::Bytes;
-use hyper::{Response, StatusCode};
+use hyper::{Body, Request, Response, StatusCode};
 
 use garage_util::error::Error;
 
@@ -22,6 +22,7 @@ fn object_headers(version: &ObjectVersion) -> http::response::Builder {
 		.header("Content-Type", version.mime_type.to_string())
 		.header("Content-Length", format!("{}", version.size))
 		.header("Last-Modified", date_str)
+		.header("Accept-Ranges", format!("bytes"))
 }
 
 pub async fn handle_head(
@@ -59,6 +60,7 @@ pub async fn handle_head(
 
 pub async fn handle_get(
 	garage: Arc<Garage>,
+	req: &Request<Body>,
 	bucket: &str,
 	key: &str,
 ) -> Result<Response<BodyType>, Error> {
@@ -82,6 +84,25 @@ pub async fn handle_get(
 		None => return Err(Error::NotFound),
 	};
 
+	let range = match req.headers().get("range") {
+		Some(range) => {
+			let range_str = range
+				.to_str()
+				.map_err(|e| Error::BadRequest(format!("Invalid range header: {}", e)))?;
+			let mut ranges = http_range::HttpRange::parse(range_str, last_v.size)
+				.map_err(|_e| Error::BadRequest(format!("Invalid range")))?;
+			if ranges.len() > 1 {
+				return Err(Error::BadRequest(format!("Multiple ranges not supported")));
+			} else {
+				ranges.pop()
+			}
+		}
+		None => None,
+	};
+	if let Some(range) = range {
+		return handle_get_range(garage, last_v, range.start, range.start + range.length).await;
+	}
+
 	let resp_builder = object_headers(&last_v).status(StatusCode::OK);
 
 	match &last_v.data {
@@ -131,3 +152,76 @@ pub async fn handle_get(
 		}
 	}
 }
+
+pub async fn handle_get_range(
+	garage: Arc<Garage>,
+	version: &ObjectVersion,
+	begin: u64,
+	end: u64,
+) -> Result<Response<BodyType>, Error> {
+	if end > version.size {
+		return Err(Error::BadRequest(format!("Range not included in file")));
+	}
+
+	let resp_builder = object_headers(&version)
+		.header(
+			"Content-Range",
+			format!("bytes {}-{}/{}", begin, end, version.size),
+		)
+		.status(StatusCode::PARTIAL_CONTENT);
+
+	match &version.data {
+		ObjectVersionData::Uploading => Err(Error::Message(format!(
+			"Version is_complete() but data is stil Uploading (internal error)"
+		))),
+		ObjectVersionData::DeleteMarker => Err(Error::NotFound),
+		ObjectVersionData::Inline(bytes) => {
+			if end as usize <= bytes.len() {
+				let body: BodyType = Box::new(BytesBody::from(
+					bytes[begin as usize..end as usize].to_vec(),
+				));
+				Ok(resp_builder.body(body)?)
+			} else {
+				Err(Error::Message(format!("Internal error: requested range not present in inline bytes when it should have been")))
+			}
+		}
+		ObjectVersionData::FirstBlock(_first_block_hash) => {
+			let version = garage.version_table.get(&version.uuid, &EmptyKey).await?;
+			let version = match version {
+				Some(v) => v,
+				None => return Err(Error::NotFound),
+			};
+
+			let blocks = version
+				.blocks()
+				.iter()
+				.cloned()
+				.filter(|block| block.offset + block.size > begin && block.offset < end)
+				.collect::<Vec<_>>();
+
+			let body_stream = futures::stream::iter(blocks)
+				.map(move |block| {
+					let garage = garage.clone();
+					async move {
+						let data = garage.block_manager.rpc_get_block(&block.hash).await?;
+						let start_in_block = if block.offset > begin {
+							0
+						} else {
+							begin - block.offset
+						};
+						let end_in_block = if block.offset + block.size < end {
+							block.size
+						} else {
+							end - block.offset
+						};
+						Ok(Bytes::from(
+							data[start_in_block as usize..end_in_block as usize].to_vec(),
+						))
+					}
+				})
+				.buffered(2);
+			let body: BodyType = Box::new(StreamBody::new(Box::pin(body_stream)));
+			Ok(resp_builder.body(body)?)
+		}
+	}
+}