wire in /contacts.json endpoint

bin/heliotrope-server

@@ -16,6 +16,10 @@ class Set
   def to_json(*a); to_a.to_json(*a) end
 end
 
+module Enumerable
+  def uniq_by; inject({}) { |h, e| h[yield(e)] ||= e; h }.values end
+end
+
 class HeliotropeServer < Sinatra::Base
   API_VERSION = 0.1
 
@@ -421,6 +425,20 @@ class HeliotropeServer < Sinatra::Base
     get_message_summary(message_id).merge(:response => :ok).to_json
   end
 
+  get "/contacts.json" do
+    content_type :json
+
+    prefix = params["prefix"]
+    num = (params["num"] || 20).to_i
+
+    contacts = @metaindex.contacts(:prefix => prefix, :num => num).
+      sort_by { |c| -c[:timestamp] }.
+      uniq_by { |c| c[:email] }.
+      map { |c| { :name => c[:name], :email => c[:email] } }
+
+    { :response => :ok, :contacts => contacts }.to_json
+  end
+
 private
 
   def parse_json_set val

lib/heliotrope-client.rb

@@ -83,6 +83,7 @@ def raw_message message_id
   def labels; get_json("labels")["labels"] end
   def info; get_json("info") end
   def size; get_json("size")["size"] end
+  def contacts prefix; get_json("contacts")["contacts"] end
 
   def prune_labels!; post_json("labels/prune")["labels"] end