feat(Redis): support aliased commands

Fixes #443

sample.config.yaml

@@ -123,10 +123,18 @@ http:
 
 # Connection to the Redis server.
 redis:
-    # Syntax: redis://[db[:password]@]hostname[:port]
+    # Syntax: redis://[db[:password]@]hostname[:port][/db-number]
     #
-    # Default: redis://localhost:6379
-    #uri: ''
+    # Default: redis://localhost:6379/0
+    #uri: redis://redis.company.lan/42
+
+    # List of aliased commands.
+    #
+    # See http://redis.io/topics/security#disabling-of-specific-commands
+    #renameCommands:
+    #  del: '3dda29ad-3015-44f9-b13b-fa570de92489'
+    #  srem: '3fd758c9-5610-4e9d-a058-dbf4cb6d8bf0'
+
 
 # Directory containing the database of XO.
 # Currently used for logs.

src/collection/redis.js

@@ -36,7 +36,7 @@ export default class Redis extends Collection {
     connection,
     indexes = [],
     prefix,
-    uri = 'tcp://localhost:6379'
+    uri
   }) {
     super()
 

src/xo.js

@@ -41,7 +41,11 @@ export default class Xo extends EventEmitter {
     this._httpRequestWatchers = createRawObject()
 
     // Connects to Redis.
-    this._redis = createRedisClient(config.redis && config.redis.uri)
+    const redisConf = config.redis
+    this._redis = createRedisClient(redisConf && {
+      rename_commands: redisConf.renameCommands,
+      url: redisConf.uri
+    })
   }
 
   // -----------------------------------------------------------------