Add REDIS_USER and REDIS_DB configuration variables

See https://github.com/timvisee/send/issues/23#issuecomment-843925819

docs/docker.md

@@ -58,13 +58,13 @@ Pick how you want to store uploaded files and set these config options according
 
 - Local filesystem (the default): set `FILE_DIR` to the local path used inside the container for storage (or leave the default)
 - S3-compatible object store: set `S3_BUCKET`, `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY` (and `S3_ENDPOINT` if using something other than AWS)
-- Google Cloud Storage: set `GCS_BUCKET` to the name of a GCS bucket (auth should be set up using [Application Default Credentials](https://cloud.google.com/docs/authentication/production#auth-cloud-implicit-nodejs)) 
+- Google Cloud Storage: set `GCS_BUCKET` to the name of a GCS bucket (auth should be set up using [Application Default Credentials](https://cloud.google.com/docs/authentication/production#auth-cloud-implicit-nodejs))
 
 Redis is used as the metadata database for the backend and is required no matter which storage method you use.
 
 | Name  | Description |
 |------------------|-------------|
-| `REDIS_HOST`, `REDIS_PORT`, `REDIS_PASSWORD` | Host name, port, and pass of the Redis server (defaults to `localhost`, `6379`, and no password)
+| `REDIS_HOST`, `REDIS_PORT`, `REDIS_USER`, `REDIS_PASSWORD`, `REDIS_DB` | Host name, port, and pass of the Redis server (defaults to `localhost`, `6379`, and no password)
 | `FILE_DIR`       | Directory for storage inside the Docker container (defaults to `/uploads`)
 | `S3_BUCKET`  | The S3 bucket name to use (only set if using S3 for storage)
 | `S3_ENDPOINT` | An optional custom endpoint to use for S3 (defaults to AWS)

server/config.js

@@ -89,11 +89,21 @@ const conf = convict({
     default: 6379,
     env: 'REDIS_PORT'
   },
+  redis_user: {
+    format: String,
+    default: '',
+    env: 'REDIS_USER'
+  },
   redis_password: {
     format: String,
     default: '',
     env: 'REDIS_PASSWORD'
   },
+  redis_db: {
+    format: String,
+    default: '',
+    env: 'REDIS_DB'
+  },
   redis_event_expire: {
     format: Boolean,
     default: false,

server/storage/redis.js

@@ -21,8 +21,12 @@ module.exports = function(config) {
       return config.redis_retry_delay;
     }
   };
+  if (config.redis_user != null && config.redis_user.length > 0)
+    client_config.user = config.redis_user;
   if (config.redis_password != null && config.redis_password.length > 0)
     client_config.password = config.redis_password;
+  if (config.redis_db != null && config.redis_db.length > 0)
+    client_config.db = config.redis_db;
   const client = redis.createClient(client_config);
 
   client.ttlAsync = promisify(client.ttl);