tweak operation & document validations

- document's service is optional
- operation's alsoKnownAs is required
- don't fail on invalid services in document, just ignore them
- don't fail on invalid alsoKnownAs handles, just ignore them

lib/didkit/at_handles.rb

@@ -6,9 +6,8 @@ class FormatError < StandardError
     def parse_also_known_as(aka)
       raise FormatError, "Invalid alsoKnownAs: #{aka.inspect}" unless aka.is_a?(Array)
       raise FormatError, "Invalid alsoKnownAs: #{aka.inspect}" unless aka.all? { |x| x.is_a?(String) }
-      raise FormatError, "Invalid alsoKnownAs: #{aka.inspect}" unless aka.all? { |x| x =~ %r(\Aat://[^/]+\z) }
 
-      aka.map { |x| x.gsub('at://', '') }
+      aka.select { |x| x =~ %r(\Aat://[^/]+\z) }.map { |x| x.gsub('at://', '') }
     end
   end
 end

lib/didkit/document.rb

@@ -21,22 +21,18 @@ def initialize(did, json)
       @did = did
       @json = json
 
-      service = json['service']
-      raise FormatError, "Missing service key" if service.nil?
-      raise FormatError, "Invalid service data" unless service.is_a?(Array) && service.all? { |x| x.is_a?(Hash) }
-
-      @services = service.map { |x|
-        id, type, endpoint = x.values_at('id', 'type', 'serviceEndpoint')
-
-        raise FormatError, "Missing service id" unless id
-        raise FormatError, "Invalid service id: #{id.inspect}" unless id.is_a?(String) && id.start_with?('#')
-        raise FormatError, "Missing service type" unless type
-        raise FormatError, "Invalid service type: #{type.inspect}" unless type.is_a?(String)
-        raise FormatError, "Missing service endpoint" unless endpoint
-        raise FormatError, "Invalid service endpoint: #{endpoint.inspect}" unless endpoint.is_a?(String)
-
-        ServiceRecord.new(id.gsub(/^#/, ''), type, endpoint)
-      }
+      if service = json['service']
+        raise FormatError, "Invalid service data" unless service.is_a?(Array) && service.all? { |x| x.is_a?(Hash) }
+
+        @services = service.filter_map { |x|
+          id, type, endpoint = x.values_at('id', 'type', 'serviceEndpoint')
+          next unless id.is_a?(String) && id.start_with?('#') && type.is_a?(String) && endpoint.is_a?(String)
+
+          ServiceRecord.new(id.gsub(/^#/, ''), type, endpoint)
+        }
+      else
+        @services = []
+      end
 
       @handles = parse_also_known_as(json['alsoKnownAs'] || [])
     end

lib/didkit/plc_operation.rb

@@ -51,7 +51,7 @@ def initialize(json)
         ServiceRecord.new(k, type, endpoint)
       }
 
-      @handles = parse_also_known_as(operation['alsoKnownAs'] || [])
+      @handles = parse_also_known_as(operation['alsoKnownAs'])
     end
   end
 end