Add Api::ConfigDefinitionsController to fetch plugin definitions

Signed-off-by: Kenji Okimoto <okimoto@clear-code.com>

app/controllers/api/config_definitions_controller.rb

@@ -0,0 +1,53 @@
+class Api::ConfigDefinitionsController < ApplicationController
+  before_action :login_required
+
+  def index
+    name = params[:name]
+    type = params[:type]
+    prefix = case type
+             when "input"
+               "in"
+             when "output"
+               "out"
+             when "filter"
+               "filter"
+             when "parse"
+               "parser"
+             when "format"
+               "formatter"
+             when "parser", "formatter", "buffer", "storage"
+               type
+             end
+
+    target_class = Fluentd::Setting.const_get("#{prefix}_#{name}".classify)
+    target = target_class.new
+
+    common_options = target.common_options.map do |key|
+      h = {
+        name: key,
+        type: target.column_type(key),
+        desc: target.desc(key)
+      }
+      h[:list] = target.list_of(key) if target.column_type(key) == :enum
+      h
+    end
+
+    advanced_options = target.advanced_options.map do |key|
+      h = {
+        name: key,
+        type: target.column_type(key),
+        desc: target.desc(key)
+      }
+      h[:list] = target.list_of(key) if target.column_type(key) == :enum
+      h
+    end
+
+    options = {
+      type: type,
+      name: name,
+      commonOptions: common_options,
+      advancedOptions: advanced_options
+    }
+    render json: options
+  end
+end

config/routes.rb

@@ -129,5 +129,6 @@ Rails.application.routes.draw do
     post "grok_to_regexp"
 
     resources :settings, only: [:index, :show, :update, :destroy], defaults: { format: "json" }
+    resources :config_definitions, only: [:index], defaults: { format: "json" }
   end
 end