profile_url and atom_url are optional in webfinger

lib/diaspora_federation/validators/web_finger_validator.rb

@@ -12,8 +12,8 @@ module DiasporaFederation
       rule :alias_url, URI: %i(host path)
       rule :hcard_url, [:not_nil, URI: %i(host path)]
       rule :seed_url, %i(not_nil URI)
-      rule :profile_url, [:not_nil, URI: %i(host path)]
-      rule :atom_url, [:not_nil, URI: %i(host path)]
+      rule :profile_url, URI: %i(host path)
+      rule :atom_url, URI: %i(host path)
       rule :salmon_url, URI: %i(host path)
     end
   end

spec/lib/diaspora_federation/discovery/web_finger_spec.rb

@@ -63,6 +63,21 @@ XML
         expect(wf.public_key).to eq(person.serialized_public_key)
       end
 
+      it "reads minimal xml" do
+        minimal_xml = <<-XML
+<?xml version="1.0" encoding="UTF-8"?>
+<XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">
+  <Subject>#{acct}</Subject>
+  <Link rel="http://microformats.org/profile/hcard" type="text/html" href="#{person.hcard_url}"/>
+  <Link rel="http://joindiaspora.com/seed_location" type="text/html" href="#{person.url}"/>
+</XRD>
+XML
+        wf = Discovery::WebFinger.from_xml(minimal_xml)
+        expect(wf.acct_uri).to eq(acct)
+        expect(wf.hcard_url).to eq(person.hcard_url)
+        expect(wf.seed_url).to eq(person.url)
+      end
+
       it "is frozen after parsing" do
         wf = Discovery::WebFinger.from_xml(xml)
         expect(wf).to be_frozen

spec/lib/diaspora_federation/validators/web_finger_validator_spec.rb

@@ -10,7 +10,7 @@ module DiasporaFederation
       end
     end
 
-    %i(hcard_url profile_url atom_url).each do |prop|
+    %i(hcard_url).each do |prop|
       describe "##{prop}" do
         it_behaves_like "a url validator without path" do
           let(:property) { prop }
@@ -23,7 +23,7 @@ module DiasporaFederation
     end
 
     # optional urls
-    %i(alias_url salmon_url).each do |prop|
+    %i(alias_url salmon_url profile_url atom_url).each do |prop|
       describe "##{prop}" do
         it_behaves_like "a property with a value validation/restriction" do
           let(:property) { prop }