Add the option to use a proc to modify the data being sent by a webhook

lib/god/contacts/webhook.rb

@@ -1,7 +1,8 @@
 # Send a notice to a webhook.
 #
-# url    - The String webhook URL.
-# format - The Symbol format [ :form | :json ] (default: :form).
+# url          - The String webhook URL.
+# format       - The Symbol format [ :form | :json ] (default: :form).
+# process_data - The optional Proc that returns a custom data object to send to the webhook.
 
 require 'net/http'
 require 'uri'
@@ -16,28 +17,34 @@ module Contacts
 
     class Webhook < Contact
       class << self
-        attr_accessor :url, :format
+        attr_accessor :url, :format, :process_data
       end
 
       self.format = :form
+      self.process_data = nil
 
       def valid?
         valid = true
         valid &= complain("Attribute 'url' must be specified", self) unless arg(:url)
         valid &= complain("Attribute 'format' must be one of [ :form | :json ]", self) unless [:form, :json].include?(arg(:format))
+        valid &= complain("Attribute 'process_data' must be a proc object if defined ", self) unless arg(:process_data).nil? || arg(:process_data).is_a?(Proc)
         valid
       end
 
-      attr_accessor :url, :format
+      attr_accessor :url, :format, :process_data
 
       def notify(message, time, priority, category, host)
-        data = {
-          :message => message,
-          :time => time,
-          :priority => priority,
-          :category => category,
-          :host => host
-        }
+        if arg(:process_data)
+          data = arg(:process_data).call(message, time, priority, category, host)
+        else
+          data = {
+            :message => message,
+            :time => time,
+            :priority => priority,
+            :category => category,
+            :host => host
+          }
+        end
 
         uri = URI.parse(arg(:url))
         http = Net::HTTP.new(uri.host, uri.port)

test/test_webhook.rb

@@ -19,4 +19,18 @@ def test_notify_with_url_containing_query_parameters
 
     @webhook.notify('msg', Time.now, 'prio', 'cat', 'host')
   end
+
+  def test_notify_with_process_data_callback
+    data_to_send = {:processed => true}
+    data_callback = proc do |message, time, priority, category, host|
+      data_to_send
+    end
+
+    @webhook.url = 'http://example.com/switch'
+    @webhook.format = :json
+    @webhook.process_data = data_callback
+    Net::HTTP.any_instance.expects(:request).with {|req| req.body == data_to_send.to_json }.returns(Net::HTTPSuccess.new('a', 'b', 'c'))
+
+    @webhook.notify('msg', Time.now, 'prio', 'cat', 'host')
+  end
 end