Add Storj DCS to cloud object storage options (#21929)

* Add Storj DCS to cloud object storage options

More explanation here: https://forum.storj.io/t/object-storage-provider-for-mastodon-instance/11464/37

* more help for which command to use

lib/tasks/mastodon.rake

@@ -142,7 +142,7 @@ namespace :mastodon do
       prompt.say "\n"
 
       if prompt.yes?('Do you want to store uploaded files on the cloud?', default: false)
-        case prompt.select('Provider', ['DigitalOcean Spaces', 'Amazon S3', 'Wasabi', 'Minio', 'Google Cloud Storage'])
+        case prompt.select('Provider', ['DigitalOcean Spaces', 'Amazon S3', 'Wasabi', 'Minio', 'Google Cloud Storage', 'Storj DCS'])
         when 'DigitalOcean Spaces'
           env['S3_ENABLED'] = 'true'
           env['S3_PROTOCOL'] = 'https'
@@ -257,6 +257,42 @@ namespace :mastodon do
             q.required true
             q.modify :strip
           end
+        when 'Storj DCS'
+          env['S3_ENABLED']  = 'true'
+          env['S3_PROTOCOL'] = 'https'
+          env['S3_REGION']   = 'global'
+
+          env['S3_ENDPOINT'] = prompt.ask('Storj DCS endpoint URL:') do |q|
+            q.required true
+            q.default "https://gateway.storjshare.io"
+            q.modify :strip
+          end
+
+          env['S3_PROTOCOL'] = env['S3_ENDPOINT'].start_with?('https') ? 'https' : 'http'
+          env['S3_HOSTNAME'] = env['S3_ENDPOINT'].gsub(/\Ahttps?:\/\//, '')
+
+          env['S3_BUCKET'] = prompt.ask('Storj DCS bucket name:') do |q|
+            q.required true
+            q.default "files.#{env['LOCAL_DOMAIN']}"
+            q.modify :strip
+          end
+
+          env['AWS_ACCESS_KEY_ID'] = prompt.ask('Storj Gateway access key (uplink share --register --readonly=false --not-after=none sj://bucket):') do |q|
+            q.required true
+            q.modify :strip
+          end
+
+          env['AWS_SECRET_ACCESS_KEY'] = prompt.ask('Storj Gateway secret key:') do |q|
+            q.required true
+            q.modify :strip
+          end
+          
+          linksharing_access_key = prompt.ask('Storj Linksharing access key (uplink share --register --public --readonly=true --disallow-lists --not-after=none sj://bucket):') do |q|
+            q.required true
+            q.modify :strip
+          end
+          env['S3_ALIAS_HOST'] = "link.storjshare.io/raw/#{linksharing_access_key}/#{env['S3_BUCKET']}"
+          
         when 'Google Cloud Storage'
           env['S3_ENABLED']             = 'true'
           env['S3_PROTOCOL']            = 'https'