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ara_m fix export of AID-REF-DO (empty)

GPD_SPE_013 Table 6-3 defines two types of AID-REF-DO objects (both
are fully independed TLV IEs with the same name). The version with
tag '4F' identifies an SE application. It may contain an AID prefix
or even be of length 0 in case the rule should apply to all SE
applications. Then there is the version with tag 'C0', which must
always have length 0 and serves a flag to apply the rule to the
implicitly selected SE application. Technically both are completely
different things, so we must also treat them separately in the
pySim-shell code.

Related: OS#6681
Change-Id: I771d5e860b12215280e3d0a8c314ce843fe0d6a2
---
M pySim/ara_m.py
1 file changed, 11 insertions(+), 7 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/57/39057/1

diff --git a/pySim/ara_m.py b/pySim/ara_m.py
index 63838b2..611e8f7 100644
--- a/pySim/ara_m.py
+++ b/pySim/ara_m.py
@@ -320,9 +320,9 @@
             '--device-app-id', required=True, help='Identifies the specific device application that the rule appplies to. Hash of Certificate of Application Provider, or UUID. (20/32 hex bytes)')
         aid_grp = store_ref_ar_do_parse.add_mutually_exclusive_group()
         aid_grp.add_argument(
-            '--aid', help='Identifies the specific SE application for which rules are to be stored. Can be a partial AID, containing for example only the RID.  (5-16 hex bytes)')
+            '--aid', help='Identifies the specific SE application for which rules are to be stored. Can be a partial AID, containing for example only the RID. (5-16 or 0 hex bytes)')
         aid_grp.add_argument('--aid-empty', action='store_true',
-                             help='No specific SE application, applies to all applications')
+                             help='No specific SE application, applies to implicitly selected application (all channels)')
         store_ref_ar_do_parse.add_argument(
             '--pkg-ref', help='Full Android Java package name (up to 127 chars ASCII)')
         # AR-DO
@@ -423,10 +423,13 @@
         # matching key.
         if dictlist is None:
             return None
-        obj = None
         for d in dictlist:
-            obj = d.get(key, obj)
-        return obj
+            if key in d:
+                obj = d.get(key)
+                if obj is None:
+                    return ""
+                return obj
+        return None
 
     @staticmethod
     def __export_ref_ar_do_list(ref_ar_do_list):
@@ -437,6 +440,7 @@
         if ref_do_list and ar_do_list:
             # Get ref_do parameters
             aid_ref_do = CardApplicationARAM.__export_get_from_dictlist('aid_ref_do', ref_do_list)
+            aid_ref_empty_do = CardApplicationARAM.__export_get_from_dictlist('aid_ref_empty_do', ref_do_list)
             dev_app_id_ref_do = CardApplicationARAM.__export_get_from_dictlist('dev_app_id_ref_do', ref_do_list)
             pkg_ref_do = CardApplicationARAM.__export_get_from_dictlist('pkg_ref_do', ref_do_list)
 
@@ -447,9 +451,9 @@
 
             # Write command-line
             export_str += "aram_store_ref_ar_do"
-            if aid_ref_do:
+            if aid_ref_do is not None:
                 export_str += (" --aid \"%s\"" % aid_ref_do)
-            else:
+            if aid_ref_empty_do is not None:
                 export_str += " --aid-empty"
             if dev_app_id_ref_do:
                 export_str += (" --device-app-id \"%s\"" % dev_app_id_ref_do)

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