[TrueCloudLab#37] Limit number of objects to delete

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

CHANGELOG.md

@@ -21,6 +21,7 @@ This document outlines major changes between releases.
 - Return error on invalid LocationConstraint (TrueCloudLab#23)
 - Place billing metrics to separate url path (TrueCloudLab#26)
 - Add generated deb builder files to .gitignore, and fix typo (TrueCloudLab#28)
+- Limit number of objects to delete at one time (TrueCloudLab#37) 
 
 ## [0.26.0] - 2022-12-28
 

api/handler/delete.go

@@ -17,6 +17,9 @@ import (
 	"go.uber.org/zap/zapcore"
 )
 
+// limitation of AWS https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObjects.html
+const maxObjectsToDelete = 1000
+
 // DeleteObjectsRequest -- xml carrying the object key names which should be deleted.
 type DeleteObjectsRequest struct {
 	// Element to enable quiet mode for the request
@@ -176,6 +179,11 @@ func (h *handler) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *http.Re
 		return
 	}
 
+	if len(requested.Objects) == 0 || len(requested.Objects) > maxObjectsToDelete {
+		h.logAndSendError(w, "number of objects to delete must be greater than 0 and less or equal to 1000", reqInfo, errors.GetAPIError(errors.ErrMalformedXML))
+		return
+	}
+
 	removed := make(map[string]*layer.VersionedObject)
 	toRemove := make([]*layer.VersionedObject, 0, len(requested.Objects))
 	for _, obj := range requested.Objects {