create ConfigLoader

src/server/models/config.js

@@ -209,6 +209,12 @@ module.exports = function(crowi) {
     });
   };
 
+  /**
+   * ## Note ##
+   * This method creates a config object that merge a cache into a defaults.
+   * This can be used to get the config values that reflect the database values and the default values.
+   * So, this method should be renamed to more a general name.
+   */
   configSchema.statics.setupConfigFormData = function(ns, config) {
     var defaultConfig = {};
 

src/server/service/config-loader.js

@@ -0,0 +1,74 @@
+import Config from '../models/config';
+
+const debug = require('debug')('growi:models:config');
+
+const ENV_VAR_NAME_TO_KEY_MAP = {
+  'MONGO_URI': 'app',
+  'NODE_ENV': 'app',
+  'PORT': 'app',
+  'ELASTICSEARCH_URI': 'app',
+  'REDIS_URI': 'app',
+  'PASSWORD_SEED': 'app',
+  'SECRET_TOKEN': 'app',
+  'SESSION_NAME': 'app',
+  'FILE_UPLOAD': 'app',
+  'HACKMD_URI': 'app',
+  'HACKMD_URI_FOR_SERVER': 'app',
+  'PLANTUML_URI': 'app',
+  'BLOCKDIAG_URI': 'app',
+  'OAUTH_GOOGLE_CLIENT_ID': 'app',
+  'OAUTH_GOOGLE_CLIENT_SECRET': 'app',
+  'OAUTH_GITHUB_CLIENT_ID': 'app',
+  'OAUTH_GITHUB_CLIENT_SECRET': 'app',
+  'OAUTH_TWITTER_CONSUMER_KEY': 'app',
+  'OAUTH_TWITTER_CONSUMER_SECRET': 'app',
+  'SAML_ENTRY_POINT': 'app',
+  'SAML_ISSUER': 'app',
+  'SAML_CERT': 'app'
+};
+
+class ConfigLoader {
+
+  static async load() {
+    await this.integrateEnvVars();
+
+    const config = {};
+    await Config.find()
+      .sort({ns: 1, key: 1})
+      .exec((err, doc) => {
+
+        doc.forEach((el) => {
+          if (!config[el.ns]) {
+            config[el.ns] = {};
+          }
+          config[el.ns][el.key] = JSON.parse(el.value);
+        });
+
+        debug('Config loaded', config);
+      });
+
+    Config.setupConfigFormData('crowi', config);
+
+    return config;
+  }
+
+  static async integrateEnvVars() {
+    for (const ENV_VAR_NAME of ENV_VAR_NAME_TO_KEY_MAP) {
+      try {
+        await Config.findOneAndUpdate(
+          {ns: 'crowi', key: ENV_VAR_NAME_TO_KEY_MAP[ENV_VAR_NAME]},
+          {ns: 'crowi', key: ENV_VAR_NAME, value: JSON.stringify(process.env[ENV_VAR_NAME]), from_env: true},
+          {upsert: true},
+          (err, config) => {
+            debug('Config.findAndUpdate', err, config);
+          }
+        );
+      }
+      catch (e) {
+        debug('Config.findAndUpdate', e);
+      }
+    }
+  }
+}
+
+module.exports = ConfigLoader;