1 files changed, 96 insertions, 0 deletions
diff --git a/lib/nickserver/hkp/v_index_response.rb b/lib/nickserver/hkp/v_index_response.rb
new file mode 100644
index 0000000..865d476
--- /dev/null
+++ b/lib/nickserver/hkp/v_index_response.rb
@@ -0,0 +1,96 @@
+require 'nickserver/hkp'
+require 'nickserver/hkp/key_info'
+
+#
+# Simple parser for Hkp KeyInfo responses.
+#
+# Focus is on simple here. Trying to avoid state and sideeffects.
+# Parsing a response with 12 keys and validating them takes 2ms.
+# So no need for memoization and making things more complex.
+module Nickserver::Hkp
+  class VIndexResponse
+
+    # for this regexp to work, the source text must end in a trailing "\n",
+    # which the output of sks does.
+    MATCH_PUB_KEY = /(^pub:.+?\n(^uid:.+?\n)+)/m
+
+    #  hkp_response -- raw output from a vindex hkp query (machine readable)
+    def initialize(nick, hkp_response)
+      @nick = nick.to_s
+      @vindex_result = hkp_response[:body]
+    end
+
+    def status
+      if keys.empty?
+        error_status
+      else
+        200
+      end
+    end
+
+    def keys
+      key_infos.reject { |key| error_for_key(key) }
+    end
+
+    def msg
+      if errors.any?
+        error_messages.join "\n"
+      else
+        "Could not fetch keyinfo."
+      end
+    end
+
+    protected
+
+    attr_reader :vindex_result, :nick
+
+    def error_status
+      if errors.any?
+        500
+      else
+        404
+      end
+    end
+
+    def errors
+      key_infos.map{|key| error_for_key(key) }.compact
+    end
+
+    def error_messages
+      key_infos.map do |key|
+        err = error_for_key(key)
+        error_message(key, err)
+      end.compact
+    end
+
+    def key_infos
+      all_key_infos.select do |key_info|
+        key_info.uids.include?(nick)
+      end
+    end
+
+    def all_key_infos
+      @all_key_infos ||= vindex_result.scan(MATCH_PUB_KEY).map do |match|
+        KeyInfo.new(match[0])
+      end
+    end
+
+    def error_message(key, err)
+      "Ignoring key #{key.keyid} for #{nick}: #{err}" if err
+    end
+
+    def error_for_key(key)
+      if key.keylen < 2048
+        "key length is too short."
+      elsif key.expired?
+        "key expired."
+      elsif key.revoked?
+        "key revoked."
+      elsif key.disabled?
+        "key disabled."
+      elsif key.expirationdate && key.expirationdate < Time.now
+        "key expired"
+      end
+    end
+  end
+end