Refactors configuration management (#4271)

* Adds flow types / Configuration interfaces

* Lets call it options

* Use a single interface to generate the configurations

* Translates options to definitions only if comments are set

* improves logic

* Moves objects around

* Fixes issue affecting logging of circular objects

* fixes undefined env

* Moves all defaults to defaults

* Adds back CLI defaults

* Restored defaults in commander.js

* Merge provided defaults and platform defaults

* Addresses visual nits

* Improves Config.js code

* Adds ability to pass the default value in trailing comments

* Load platform defaults from the definitions file

* proper default values on various options

* Adds ParseServer.start and server.start(options) as quick startup methods

* Moves creating liveQueryServer http into ParseServer.js

* removes dead code

* Adds tests to guarantee we can start a LQ Server from main module

* Fixes incorrect code regading liveQuery init port

* Start a http server for LQ if port is specified

* ensure we dont fail if config.port is not set

* Specify port

* ignore other path skipped in tests

* Adds test for custom middleware setting

* Refactors new Config into Config.get

- Hides AppCache from ParseServer.js, use Config.put which validates

* Extracts controller creation into Controllers/index.js

- This makes the ParseServer init way simpler

* Move serverURL inference into ParseServer

* review nits

src/defaults.js

@@ -1,5 +1,5 @@
-import {nullParser} from './cli/utils/parsers';
-
+import { nullParser } from './Options/parsers';
+const { ParseServerOptions } = require('./Options/Definitions');
 const logsFolder = (() => {
   let folder = './logs/';
   if (typeof process !== 'undefined' && process.env.TESTING === '1') {
@@ -16,25 +16,21 @@ const { verbose, level } = (() => {
   return { verbose, level: verbose ? 'verbose' : undefined }
 })();
 
-export default {
-  DefaultMongoURI: 'mongodb://localhost:27017/parse',
+
+const DefinitionDefaults = Object.keys(ParseServerOptions).reduce((memo, key) => {
+  const def = ParseServerOptions[key];
+  if (def.hasOwnProperty('default')) {
+    memo[key] = def.default;
+  }
+  return memo;
+}, {});
+
+const computedDefaults = {
   jsonLogs: process.env.JSON_LOGS || false,
   logsFolder,
   verbose,
   level,
-  silent: false,
-  enableAnonymousUsers: true,
-  allowClientClassCreation: true,
-  maxUploadSize: '20mb',
-  verifyUserEmails: false,
-  preventLoginWithUnverifiedEmail: false,
-  sessionLength: 31536000,
-  expireInactiveSessions: true,
-  revokeSessionOnPasswordReset: true,
-  schemaCacheTTL: 5000, // in ms
-  cacheTTL: 5000,
-  cacheMaxSize: 10000,
-  userSensitiveFields: ['email'],
-  objectIdSize: 10,
-  masterKeyIps: []
 }
+
+export default Object.assign({}, DefinitionDefaults, computedDefaults);
+export const DefaultMongoURI = DefinitionDefaults.databaseURI;