S3 - Allow uploads using a PUT request without content-type (#3699)

moto/s3/responses.py

@@ -1187,10 +1187,17 @@ class ResponseObject(_TemplateEnvironmentMixin, ActionAuthenticatorMixin):
         else:
             # Flask server
             body = request.data
-            # when the data is being passed as a file
-            if request.files and not body:
-                for _, value in request.files.items():
-                    body = value.stream.read()
+            if not body:
+                # when the data is being passed as a file
+                if request.files:
+                    for _, value in request.files.items():
+                        body = value.stream.read()
+                elif hasattr(request, "form"):
+                    # Body comes through as part of the form, if no content-type is set on the PUT-request
+                    # form = ImmutableMultiDict([('some data 123 321', '')])
+                    form = request.form
+                    for k, _ in form.items():
+                        body = k
 
         if body is None:
             body = b""

tests/test_s3/test_s3.py

@@ -5186,6 +5186,22 @@ def test_object_headers():
     res.should.have.key("BucketKeyEnabled")
 
 
+if settings.TEST_SERVER_MODE:
+
+    @mock_s3
+    def test_upload_data_without_content_type():
+        bucket = "mybucket"
+        s3 = boto3.client("s3")
+        s3.create_bucket(Bucket=bucket)
+        data_input = b"some data 123 321"
+        req = requests.put("http://localhost:5000/mybucket/test.txt", data=data_input)
+        req.status_code.should.equal(200)
+
+        res = s3.get_object(Bucket=bucket, Key="test.txt")
+        data = res["Body"].read()
+        assert data == data_input
+
+
 @mock_s3
 def test_get_object_versions_with_prefix():
     bucket_name = "testbucket-3113"