s3api: Make quota-exceeded errors more obvious

Change-Id: Ia8db40227343e9c4555267c62072a1c9bfc28c66
Closes-Bug: #1893811

swift/common/middleware/s3api/s3request.py

@@ -1380,6 +1380,8 @@ class S3Request(swob.Request):
                 error_codes[sw_resp.status_int]  # pylint: disable-msg=E1101
             if isinstance(err_resp, tuple):
                 raise err_resp[0](*err_resp[1:])
+            elif b'quota' in err_msg:
+                raise err_resp(err_msg)
             else:
                 raise err_resp()
 

test/unit/common/middleware/s3api/test_obj.py

@@ -600,6 +600,31 @@ class TestS3ApiObj(S3ApiTestCase):
         # Check that s3api converts a Content-MD5 header into an etag.
         self.assertEqual(headers['etag'], etag)
 
+    @s3acl
+    def test_object_PUT_quota_exceeded(self):
+        etag = self.response_headers['etag']
+        content_md5 = binascii.b2a_base64(binascii.a2b_hex(etag)).strip()
+        if not six.PY2:
+            content_md5 = content_md5.decode('ascii')
+
+        self.swift.register(
+            'PUT', '/v1/AUTH_test/bucket/object',
+            swob.HTTPRequestEntityTooLarge, {}, 'Upload exceeds quota.')
+        req = Request.blank(
+            '/bucket/object',
+            environ={'REQUEST_METHOD': 'PUT'},
+            headers={'Authorization': 'AWS test:tester:hmac',
+                     'x-amz-storage-class': 'STANDARD',
+                     'Content-MD5': content_md5,
+                     'Date': self.get_date_header()},
+            body=self.object_body)
+        req.date = datetime.now()
+        req.content_type = 'text/plain'
+        status, headers, body = self.call_s3api(req)
+        self.assertEqual(status.split()[0], '400')
+        self.assertIn(b'<Code>EntityTooLarge</Code>', body)
+        self.assertIn(b'<Message>Upload exceeds quota.</Message', body)
+
     @s3acl
     def test_object_PUT_v4(self):
         body_sha = hashlib.sha256(self.object_body).hexdigest()