Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- app/models/media_attachment.rb
  Upstream added audio attachment support
- app/serializers/initial_state_serializer.rb
  Upstream added audio attachment support and how mimetypes are returned
- app/serializers/rest/instance_serializer.rb
  Upstream added a few fields
- config/application.rb
  Upstream added a different paperclip transcoder

app/models/concerns/attachmentable.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require 'mime/types'
+require 'mime/types/columnar'
 
 module Attachmentable
   extend ActiveSupport::Concern
@@ -10,10 +10,21 @@ module Attachmentable
   included do
     before_post_process :set_file_extensions
     before_post_process :check_image_dimensions
+    before_post_process :set_file_content_type
   end
 
   private
 
+  def set_file_content_type
+    self.class.attachment_definitions.each_key do |attachment_name|
+      attachment = send(attachment_name)
+
+      next if attachment.blank? || attachment.queued_for_write[:original].blank?
+
+      attachment.instance_write :content_type, calculated_content_type(attachment)
+    end
+  end
+
   def set_file_extensions
     self.class.attachment_definitions.each_key do |attachment_name|
       attachment = send(attachment_name)
@@ -47,4 +58,10 @@ module Attachmentable
 
     extension
   end
+
+  def calculated_content_type(attachment)
+    Paperclip.run('file', '-b --mime :file', file: attachment.queued_for_write[:original].path).split(/[:;\s]+/).first.chomp
+  rescue Terrapin::CommandLineError
+    ''
+  end
 end

app/models/concerns/user_roles.rb

@@ -13,6 +13,20 @@ module UserRoles
     admin? || moderator?
   end
 
+  def role=(value)
+    case value
+    when 'admin'
+      self.admin     = true
+      self.moderator = false
+    when 'moderator'
+      self.admin     = false
+      self.moderator = true
+    else
+      self.admin     = false
+      self.moderator = false
+    end
+  end
+
   def role
     if admin?
       'admin'