wkd: implement basic lookup of keys through wkd

wkd is the web key directory. See the Readme.md in
  /lib/nickserver/wkd

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/nickserver/wkd/url.rb b/lib/nickserver/wkd/url.rb
new file mode 100644
index 0000000..965e7ec
--- /dev/null
+++ b/lib/nickserver/wkd/url.rb
@@ -0,0 +1,31 @@
+require 'digest/sha1'
+require 'zbase32'
+
+module Nickserver
+  module Wkd
+    class Url
+
+      def initialize(email)
+        @domain = email.domain.downcase
+        @local_part = email.local_part.downcase
+      end
+
+      def to_s
+        "https://#{domain}/.well-known/openpgpkey" +
+          "/hu/#{domain}/#{encoded_digest}"
+      end
+
+      protected
+
+      attr_reader :domain, :local_part
+
+      def encoded_digest
+        ZBase32.encode32(digest.to_i(16).to_s(2))
+      end
+
+      def digest
+        Digest::SHA1.hexdigest local_part
+      end
+    end
+  end
+end