[AF-1921] use new installed.json format

lib/zendesk_apps_tools/server.rb

@@ -10,12 +10,77 @@ class Server < Sinatra::Base
     set :protection, except: :frame_options
     ZENDESK_DOMAINS_REGEX = %r{^http(?:s)?://[a-z0-9-]+\.(?:zendesk|zopim|futuresimple|local.futuresimple|zendesk-(?:dev|master|staging))\.com$}
 
+    get '/app.json' do
+      server_installed_json
+    end
+
     get '/app.js' do
       serve_installed_js
     end
 
     enable :cross_origin
 
+    def server_installed_json
+      access_control_allow_origin
+      content_type 'application/json'
+
+      apps = []
+      installations = []
+
+      absolute_app_path = File.join(settings.root)
+
+      manifest_json = read_json(File.join(absolute_app_path, 'manifest.json'))
+      requirements_json = read_json(File.join(absolute_app_path, 'requirements.json')) || nil
+
+      new_settings = settings.settings_helper.refresh!
+      settings.parameters = new_settings if new_settings
+
+      # add title to settings
+      settings.parameters['title'] = manifest_json['name'] || 'Local App'
+
+      apps << build_app_object(
+        settings,
+        manifest_json
+      )
+
+      installations << build_installation_object(
+        settings,
+        requirements_json
+      )
+
+      {
+        apps: apps,
+        installations: installations,
+        installation_orders: []
+      }.to_json
+    end
+
+    def build_app_object(settings, manifest)
+      manifest.merge({
+        asset_url_prefix: "http://localhost:#{settings.port}/",
+        id: settings.app_id
+      }).reject {|key| ['parameters', 'oauth'].include?(key) }
+    end
+
+    def build_installation_object(settings, requirements)
+      {
+        app_id: settings.app_id,
+        name: settings.parameters['title'],
+        collapsible: true,
+        enabled: true,
+        id: settings.app_id,
+        plan: { name: settings.plan },
+        requirements: requirements,
+        settings: settings.parameters,
+        updated_at: Time.now.iso8601
+      }
+    end
+
+    def read_json(path, parser_opts = {})
+      file = File.read(path) if File.exists?(path)
+      JSON.parse(file, parser_opts) unless file.nil?
+    end
+
     def serve_installed_js
       access_control_allow_origin
       content_type 'text/javascript'