P2: S3 Multipart Upload support complete

- InitiateMultipartUpload: POST /s3/multipart/:bucket/:key/init
- UploadPart: PUT /s3/multipart/:bucket/:key/part
- CompleteMultipartUpload: POST /s3/multipart/:bucket/:key/complete
- AbortMultipartUpload: DELETE /s3/multipart/:bucket/:key/abort
- In-memory upload tracking with once_cell::Lazy
- Part files stored in temp dir during upload
- Final file assembled on CompleteMultipartUpload
- XML responses for all operations

Tests: 293 passed, 0 failed

markbase-core/src/s3_xml.rs

@@ -76,3 +76,38 @@ pub fn list_objects_xml(bucket_name: &str, objects: &[Value]) -> (HeaderMap, Str
 
     (headers, xml)
 }
+
+pub fn initiate_multipart_upload_xml(bucket: &str, key: &str, upload_id: &str) -> (HeaderMap, String) {
+    let mut headers = HeaderMap::new();
+    headers.insert("Content-Type", "application/xml".parse().unwrap());
+
+    let xml = format!(
+        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
+<InitiateMultipartUploadResult xmlns=\"http://s3.amazonaws.com/doc/2006-03-01/\">
+  <Bucket>{}</Bucket>
+  <Key>{}</Key>
+  <UploadId>{}</UploadId>
+</InitiateMultipartUploadResult>",
+        bucket, key, upload_id
+    );
+
+    (headers, xml)
+}
+
+pub fn complete_multipart_upload_xml(bucket: &str, key: &str, etag: &str) -> (HeaderMap, String) {
+    let mut headers = HeaderMap::new();
+    headers.insert("Content-Type", "application/xml".parse().unwrap());
+
+    let xml = format!(
+        "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
+<CompleteMultipartUploadResult xmlns=\"http://s3.amazonaws.com/doc/2006-03-01/\">
+  <Location>http://localhost:11438/s3/{}/{}</Location>
+  <Bucket>{}</Bucket>
+  <Key>{}</Key>
+  <ETag>{}</ETag>
+</CompleteMultipartUploadResult>",
+        bucket, key, bucket, key, etag
+    );
+
+    (headers, xml)
+}