SignV4: trim leading/trailing spaces in header value (minio#1435)

Signed-off-by: Bala.FA <bala@minio.io>

Author: balamurugana

minio/signer.py

@@ -74,7 +74,7 @@ def _get_canonical_headers(
         ):
             values = values if isinstance(values, (list, tuple)) else [values]
             ordered_headers[key] = ",".join([
-                _MULTI_SPACE_REGEX.sub(" ", value) for value in values
+                _MULTI_SPACE_REGEX.sub(" ", value).strip() for value in values
             ])
 
     ordered_headers = OrderedDict(sorted(ordered_headers.items()))

tests/functional/tests.py

@@ -692,7 +692,12 @@ def test_put_object(log_entry, sse=None):
         reader = LimitedRandomReader(length)
         log_entry["args"]["data"] = "LimitedRandomReader(11 * MB)"
         log_entry["args"]["metadata"] = metadata = {
-            'x-amz-meta-testing': 'value', 'test-key': 'value2'}
+            'x-amz-meta-testing': 'value',
+            'test-key': 'value2',
+            "My-Project": "Project One",
+            "My-header1": "    a   b   c  ",
+            "My-Header2": "\"a   b   c\"",
+        }
         log_entry["args"]["content_type"] = content_type = (
             "application/octet-stream")
         log_entry["args"]["object_name"] = object_name + "-metadata"