refactor(config.js): Extract config file

* Separate different config source to each files
* Freeze config object

lib/config/index.js

@@ -0,0 +1,112 @@
+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+const {merge} = require('lodash')
+const deepFreeze = require('deep-freeze')
+const {Environment, Permission} = require('./enum')
+
+const appRootPath = path.join(__dirname, '../../')
+const env = process.env.NODE_ENV || Environment.development
+const debugConfig = {
+  debug: (env === Environment.development)
+}
+
+const packageConfig = {
+  version: '0.5.1',
+  minimumCompatibleVersion: '0.5.0'
+}
+
+const configFilePath = path.join(__dirname, '../../config.json')
+const fileConfig = fs.existsSync(configFilePath) ? require(configFilePath)[env] : undefined
+
+let config = require('./default')
+merge(config, require('./defaultSSL'))
+merge(config, debugConfig)
+merge(config, packageConfig)
+merge(config, fileConfig)
+merge(config, require('./oldEnvironment'))
+merge(config, require('./environment'))
+merge(config, require('./dockerSecret'))
+
+// load LDAP CA
+if (config.ldap.tlsca) {
+  let ca = config.ldap.tlsca.split(',')
+  let caContent = []
+  for (let i of ca) {
+    if (fs.existsSync(ca[i])) {
+      caContent.push(fs.readFileSync(ca[i], 'utf8'))
+    }
+  }
+  let tlsOptions = {
+    ca: caContent
+  }
+  config.ldap.tlsOptions = config.ldap.tlsOptions ? Object.assign(config.ldap.tlsOptions, tlsOptions) : tlsOptions
+}
+
+// Permission
+config.permission = Permission
+if (!config.allowanonymous) {
+  delete config.permission.freely
+}
+if (!(config.defaultpermission in config.permission)) {
+  config.defaultpermission = config.permission.editable
+}
+
+// cache result, cannot change config in runtime!!!
+config.isStandardHTTPsPort = (function isStandardHTTPsPort () {
+  return config.usessl && config.port === 443
+})()
+config.isStandardHTTPPort = (function isStandardHTTPPort () {
+  return !config.usessl && config.port === 80
+})()
+
+// cache serverURL
+config.serverurl = (function getserverurl () {
+  var url = ''
+  if (config.domain) {
+    var protocol = config.protocolusessl ? 'https://' : 'http://'
+    url = protocol + config.domain
+    if (config.urladdport) {
+      if (!config.isStandardHTTPPort || !config.isStandardHTTPsPort) {
+        url += ':' + config.port
+      }
+    }
+  }
+  if (config.urlpath) {
+    url += '/' + config.urlpath
+  }
+  return url
+})()
+
+config.Environment = Environment
+
+// auth method
+config.isFacebookEnable = config.facebook.clientID && config.facebook.clientSecret
+config.isGoogleEnable = config.google.clientID && config.google.clientSecret
+config.isDropboxEnable = config.dropbox.clientID && config.dropbox.clientSecret
+config.isTwitterEnable = config.twitter.consumerKey && config.twitter.consumerSecret
+config.isEmailEnable = config.email
+config.isGitHubEnable = config.github.clientID && config.github.clientSecret
+config.isGitLabEnable = config.gitlab.clientID && config.gitlab.clientSecret
+config.isLDAPEnable = config.ldap.url
+
+// generate correct path
+config.sslcapath = path.join(appRootPath, config.sslcapath)
+config.sslcertpath = path.join(appRootPath, config.sslcertpath)
+config.sslkeypath = path.join(appRootPath, config.sslkeypath)
+config.dhparampath = path.join(appRootPath, config.dhparampath)
+
+config.tmppath = path.join(appRootPath, config.tmppath)
+config.defaultnotepath = path.join(appRootPath, config.defaultnotepath)
+config.docspath = path.join(appRootPath, config.docspath)
+config.indexpath = path.join(appRootPath, config.indexpath)
+config.hackmdpath = path.join(appRootPath, config.hackmdpath)
+config.errorpath = path.join(appRootPath, config.errorpath)
+config.prettypath = path.join(appRootPath, config.prettypath)
+config.slidepath = path.join(appRootPath, config.slidepath)
+
+// maek config readonly
+config = deepFreeze(config)
+
+module.exports = config