explicitly parse JSON request bodies

lib/chatops/controller.rb

@@ -50,6 +50,11 @@ module Chatops
     protected
 
     def setup_params
+      json_body.each do |key, value|
+        next if params.has_key? key
+        params[key] = value
+      end
+
       permitted_params = %i[
         action
         chatop
@@ -76,6 +81,14 @@ module Chatops
       self.params = params.permit(*permitted_params)
     end
 
+    def json_body
+      hash = {}
+      if request.content_type =~ %r/\Aapplication\/json\Z/i
+        hash = GitHub::JSON.parse(request.raw_post) || {}
+      end
+      hash.with_indifferent_access
+    end
+
     def jsonrpc_params
       params["params"] || {}
     end