Use fog with S3 when S3_BUCKET env var is set

.env.production.sample

@@ -7,3 +7,14 @@ SECRET_KEY_BASE=
 
 DATABASE_URL=postgresql://postgres@postgres/postgres
 REDIS_URL=redis://redis:6379
+
+### File store
+
+## By default we use local filesystem dir ("uploads" in app root dir).
+## If you want to store uploaded recordings in S3 bucket instead,
+## uncomment and set the following variables:
+
+# AWS_ACCESS_KEY_ID=
+# AWS_SECRET_ACCESS_KEY=
+# S3_BUCKET=my-asciinema-bucket
+# S3_REGION=us-east-1

config/cfg.rb

@@ -4,10 +4,9 @@ module Asciinema
 
     attribute :bugsnag_api_key,                String
     attribute :aws_access_key_id,              String
-    attribute :aws_bucket,                     String
-    attribute :aws_region,                     String
     attribute :aws_secret_access_key,          String
-    attribute :carrierwave_storage,            String, default: 'file'
+    attribute :s3_bucket,                      String
+    attribute :s3_region,                      String
     attribute :carrierwave_storage_dir_prefix, String, default: 'uploads/'
     attribute :google_analytics_id,            String
     attribute :home_asciicast_id,              Integer

config/initializers/carrierwave.rb

@@ -1,16 +1,16 @@
 CarrierWave.configure do |config|
-  if CFG.carrierwave_storage == 'fog'
+  if CFG.s3_bucket
     config.storage = :fog
+    config.fog_directory = CFG.s3_bucket
+    config.fog_public = false
 
     config.fog_credentials = {
-      :provider              => 'AWS',
-      :aws_access_key_id     => CFG.aws_access_key_id,
-      :aws_secret_access_key => CFG.aws_secret_access_key,
-      :region                => CFG.aws_region
+      provider: 'AWS',
+      aws_access_key_id: CFG.aws_access_key_id,
+      aws_secret_access_key: CFG.aws_secret_access_key,
+      region: CFG.s3_region
     }
-    config.fog_directory = CFG.aws_bucket
-    config.fog_public = false
-  elsif CFG.carrierwave_storage == 'file'
+  else
     config.root = Rails.root
   end
 end