RGW: S3 POST policy should not require Content-Type

In the current implementation, putting a key in the acting
RGWPolicyEnv makes it required in RGWPolicyEnv::match_policy_vars.

I'm not sure this is the intent, but in any case, add it to the env
only if sent.

Fixes: http://tracker.ceph.com/issues/20201
Signed-off-by: Matt Benjamin <mbenjamin@redhat.com>
(cherry picked from commit af29276c32f7009a78bd8b90d8f7d19026859c74)

diff --git a/src/rgw/rgw_rest_s3.cc b/src/rgw/rgw_rest_s3.cc
index aa5b525d04da84cf73837af223f094fa94b0e9c9..ab031763ce172f1a683910e7d38680047fb58b2a 100644 (file)
--- a/src/rgw/rgw_rest_s3.cc
+++ b/src/rgw/rgw_rest_s3.cc
@@ -1608,7 +1608,11 @@ int RGWPostObj_ObjStore_S3::get_params()
   env.add_var("key", s->object.name);
 
   part_str(parts, "Content-Type", &content_type);
-  env.add_var("Content-Type", content_type);
+
+  /* AWS permits POST without Content-Type: http://tracker.ceph.com/issues/20201 */
+  if (! content_type.empty()) {
+    env.add_var("Content-Type", content_type);
+  }
 
   map<string, struct post_form_part, ltstr_nocase>::iterator piter =
     parts.upper_bound(RGW_AMZ_META_PREFIX);