Added safer mirror check (bug 692178)

- Guards against mirror path being None
- Changes `is_public` to be a more explicit `is_mirrorable`, which is
  what the template is really asking.

apps/files/models.py

@@ -78,11 +78,15 @@ class File(amo.models.OnChangeMixin, amo.models.ModelBase):
         else:
             return True
 
-    def is_public(self):
-        return self.status == amo.STATUS_PUBLIC
+    def is_mirrorable(self):
+        if self.version.addon.is_premium():
+            return False
+        return self.status in amo.MIRROR_STATUSES
 
     def has_been_copied(self):
         """Checks if file has been copied to mirror"""
+        if not self.mirror_file_path:
+            return False
         return os.path.isfile(self.mirror_file_path)
 
     def can_be_perf_tested(self):

apps/files/tests/test_models.py

@@ -271,6 +271,18 @@ class TestFile(amo.tests.TestCase, amo.tests.AMOPaths):
         f.version.addon.update(type=amo.ADDON_WEBAPP)
         eq_(f.can_be_perf_tested(), False)
 
+    def test_file_is_mirrorable(self):
+        f = File.objects.get(pk=67442)
+        eq_(f.is_mirrorable(), True)
+
+        f.update(status=amo.STATUS_DISABLED)
+        eq_(f.is_mirrorable(), False)
+
+    def test_premium_addon_not_mirrorable(self):
+        f = File.objects.get(pk=67442)
+        f.version.addon.premium_type = amo.ADDON_PREMIUM
+        eq_(f.is_mirrorable(), False)
+
 
 class TestParseXpi(amo.tests.TestCase):
     fixtures = ['base/apps']

apps/zadmin/templates/zadmin/addon_manage.html

@@ -46,7 +46,7 @@
                 </td>
                 <td><a href="/admin/addons/hash/{{ addon.id }}/{{ file.id }}" title="{{ file.hash }}">Recalc Hash</a></td>
                 <td>
-                  {% if file.is_public() %}
+                  {% if file.is_mirrorable() %}
                     {{ "Copied" if file.has_been_copied() else "Not Copied" }}
                   {% endif %}
                 </td>