api: various fixes

src/api/common/signature/body.rs

@@ -78,7 +78,7 @@ impl ReqBody {
 			trailer_algorithm,
 		} = self;
 
-		let (frame_tx, mut frame_rx) = mpsc::channel::<Frame<Bytes>>(1);
+		let (frame_tx, mut frame_rx) = mpsc::channel::<Frame<Bytes>>(5);
 
 		let join_checksums = tokio::spawn(async move {
 			while let Some(frame) = frame_rx.recv().await {

src/api/common/signature/mod.rs

@@ -62,7 +62,6 @@ pub struct VerifiedRequest {
 	pub request: Request<streaming::ReqBody>,
 	pub access_key: Key,
 	pub content_sha256_header: ContentSha256Header,
-	// TODO: oneshot chans to retrieve hashes after reading all body
 }
 
 pub async fn verify_request(

src/api/common/signature/payload.rs

@@ -74,21 +74,16 @@ fn parse_x_amz_content_sha256(header: Option<&str>) -> Result<ContentSha256Heade
 		} else {
 			(false, rest)
 		};
-		if algo == AWS4_HMAC_SHA256_PAYLOAD {
-			Ok(ContentSha256Header::StreamingPayload {
-				trailer,
-				signed: true,
-			})
-		} else if algo == UNSIGNED_PAYLOAD {
-			Ok(ContentSha256Header::StreamingPayload {
-				trailer,
-				signed: false,
-			})
-		} else {
-			Err(Error::bad_request(
-				"invalid or unsupported x-amz-content-sha256",
-			))
-		}
+		let signed = match algo {
+			AWS4_HMAC_SHA256_PAYLOAD => true,
+			UNSIGNED_PAYLOAD => false,
+			_ => {
+				return Err(Error::bad_request(
+					"invalid or unsupported x-amz-content-sha256",
+				))
+			}
+		};
+		Ok(ContentSha256Header::StreamingPayload { trailer, signed })
 	} else {
 		let sha256 = hex::decode(header)
 			.ok()

src/api/common/signature/streaming.rs

@@ -30,22 +30,12 @@ pub fn parse_streaming_body(
 		checked_signature.content_sha256_header
 	);
 
-	let expected_checksums = ExpectedChecksums {
-		sha256: match &checked_signature.content_sha256_header {
-			ContentSha256Header::Sha256Checksum(sha256) => Some(*sha256),
-			_ => None,
-		},
-		..Default::default()
-	};
-
-	let mut checksummer = Checksummer::init(&expected_checksums, false);
-
 	match checked_signature.content_sha256_header {
 		ContentSha256Header::StreamingPayload { signed, trailer } => {
 			// Sanity checks
 			if !signed && !trailer {
 				return Err(Error::bad_request(
-					"STREAMING-UNSIGNED-PAYLOAD is not a valid combination",
+					"STREAMING-UNSIGNED-PAYLOAD without trailer is not a valid combination",
 				));
 			}
 
@@ -64,6 +54,7 @@ pub fn parse_streaming_body(
 			}
 
 			// If trailer header is announced, add the calculation of the requested checksum
+			let mut checksummer = Checksummer::init(&Default::default(), false);
 			let trailer_algorithm = if trailer {
 				let algo = Some(
 					request_trailer_checksum_algorithm(req.headers())?
@@ -128,12 +119,21 @@ pub fn parse_streaming_body(
 				ReqBody {
 					stream: Mutex::new(signed_payload_stream.boxed()),
 					checksummer,
-					expected_checksums,
+					expected_checksums: Default::default(),
 					trailer_algorithm,
 				}
 			}))
 		}
 		_ => Ok(req.map(|body| {
+			let expected_checksums = ExpectedChecksums {
+				sha256: match &checked_signature.content_sha256_header {
+					ContentSha256Header::Sha256Checksum(sha256) => Some(*sha256),
+					_ => None,
+				},
+				..Default::default()
+			};
+			let checksummer = Checksummer::init(&expected_checksums, false);
+
 			let stream = http_body_util::BodyStream::new(body).map_err(Error::from);
 			ReqBody {
 				stream: Mutex::new(stream.boxed()),

src/api/s3/multipart.rs

@@ -114,14 +114,17 @@ pub async fn handle_put_part(
 		extra: request_checksum_value(req.headers())?,
 	};
 
-	// Read first chuck, and at the same time try to get object to see if it exists
 	let key = key.to_string();
 
 	let (req_head, mut req_body) = req.into_parts();
 
+	// Before we stream the body, configure the needed checksums.
 	req_body.add_expected_checksums(expected_checksums.clone());
 	// TODO: avoid parsing encryption headers twice...
 	if !EncryptionParams::new_from_headers(&garage, &req_head.headers)?.is_encrypted() {
+		// For non-encrypted objects, we need to compute the md5sum in all cases
+		// (even if content-md5 is not set), because it is used as an etag of the
+		// part, which is in turn used in the etag computation of the whole object
 		req_body.add_md5();
 	}
 
@@ -130,6 +133,7 @@ pub async fn handle_put_part(
 
 	let mut chunker = StreamChunker::new(stream, garage.config.block_size);
 
+	// Read first chuck, and at the same time try to get object to see if it exists
 	let ((_, object_version, mut mpu), first_block) =
 		futures::try_join!(get_upload(&ctx, &key, &upload_id), chunker.next(),)?;
 
@@ -186,7 +190,6 @@ pub async fn handle_put_part(
 	garage.version_table.insert(&version).await?;
 
 	// Copy data to version
-	// TODO don't duplicate checksums
 	let (total_size, _, _) = read_and_put_blocks(
 		&ctx,
 		&version,
@@ -198,7 +201,7 @@ pub async fn handle_put_part(
 	)
 	.await?;
 
-	// Verify that checksums map
+	// Verify that checksums match
 	let checksums = stream_checksums
 		.await
 		.ok_or_internal_error("checksum calculation")??;

src/api/s3/put.rs

@@ -79,9 +79,14 @@ pub async fn handle_put(
 	// Determine whether object should be encrypted, and if so the key
 	let encryption = EncryptionParams::new_from_headers(&ctx.garage, req.headers())?;
 
+	// The request body is a special ReqBody object (see garage_api_common::signature::body)
+	// which supports calculating checksums while streaming the data.
+	// Before we start streaming, we configure it to calculate all the checksums we need.
 	let mut req_body = req.into_body();
 	req_body.add_expected_checksums(expected_checksums.clone());
 	if !encryption.is_encrypted() {
+		// For non-encrypted objects, we need to compute the md5sum in all cases
+		// (even if content-md5 is not set), because it is used as the object etag
 		req_body.add_md5();
 	}