wkd: implement basic lookup of keys through wkd

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

2 files changed, 22 insertions, 4 deletions

diff --git a/lib/nickserver/wkd/source.rb b/lib/nickserver/wkd/source.rb
index 01f376e..750d3fa 100644
--- a/lib/nickserver/wkd/source.rb
+++ b/lib/nickserver/wkd/source.rb
@@ -1,5 +1,7 @@
 require 'nickserver/source'
 require 'nickserver/response'
+require 'nickserver/wkd/url'
+require 'nickserver/hkp/response'
 
 module Nickserver
   module Wkd
@@ -7,10 +9,27 @@ module Nickserver
 
       def query(email)
         url = Url.new(email)
-        status, body = adapter.get url
-        return Nickserver::Response.new(status, body)
+        status, blob = adapter.get url
+        Hkp::Response.new(email.to_s, armor_key(blob)) if status == 200
       end
 
+      protected
+
+      def armor_key(blob)
+        header + encode(blob) + footer
+      end
+
+      def encode(blob)
+        Base64.strict_encode64(blob).scan(/.{1,64}/).join "\n"
+      end
+
+      def header
+        "-----BEGIN PGP PUBLIC KEY BLOCK-----\n\n"
+      end
+
+      def footer
+        "\n-----END PGP PUBLIC KEY BLOCK-----\n"
+      end
     end
   end
 end
diff --git a/lib/nickserver/wkd/url.rb b/lib/nickserver/wkd/url.rb
index 965e7ec..1670628 100644
--- a/lib/nickserver/wkd/url.rb
+++ b/lib/nickserver/wkd/url.rb
@@ -11,8 +11,7 @@ module Nickserver
       end
 
       def to_s
-        "https://#{domain}/.well-known/openpgpkey" +
-          "/hu/#{domain}/#{encoded_digest}"
+        "https://#{domain}/.well-known/openpgpkey/hu/#{encoded_digest}"
       end
 
       protected