Bug 1198228 - Support em:foo attributes on Description elements. r=whimboo

The install.rdf in language packs uses em:id attributes etc, instead
of child elements. All fine with RDF/XML.
This adds support to addon_details to allow for those attributes in
addition to child elements.

testing/mozbase/mozprofile/mozprofile/addons.py

@@ -297,6 +297,11 @@ class AddonManager(object):
             rdf = get_namespace_id(doc, 'http://www.w3.org/1999/02/22-rdf-syntax-ns#')
 
             description = doc.getElementsByTagName(rdf + 'Description').item(0)
+            for entry, value in description.attributes.items():
+                # Remove the namespace prefix from the tag for comparison
+                entry = entry.replace(em, "")
+                if entry in details.keys():
+                    details.update({entry: value})
             for node in description.childNodes:
                 # Remove the namespace prefix from the tag for comparison
                 entry = node.nodeName.replace(em, "")

testing/mozbase/mozprofile/tests/addonid.py

@@ -148,7 +148,32 @@ class AddonIDTest(unittest.TestCase):
      <foobar:description>A testing extension based on the Windmill Testing Framework client source</foobar:description>
      <foobar:unpack>true</foobar:unpack>
     </Description>
- </RDF>"""]
+ </RDF>""",
+"""<?xml version="1.0"?>
+<!--
+
+-->
+
+<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+     xmlns:em="http://www.mozilla.org/2004/em-rdf#">
+  <Description about="urn:mozilla:install-manifest"
+               em:id="winning"
+               em:name="Language Pack"
+               em:version="42.0a2"
+               em:type="8"
+               em:creator="Some Contributor">
+    <em:contributor></em:contributor>
+
+    <em:targetApplication>
+      <Description>
+        <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
+        <em:minVersion>42.0a2</em:minVersion>
+        <em:maxVersion>42.0a2</em:maxVersion>
+      </Description>
+    </em:targetApplication>
+  </Description>
+</RDF>
+"""]
         return tests
 
 if __name__ == '__main__':