Permit configuring the default service URL expiry

activestorage/app/controllers/active_storage/blobs_controller.rb

@@ -8,7 +8,7 @@ class ActiveStorage::BlobsController < ActiveStorage::BaseController
   include ActiveStorage::SetBlob
 
   def show
-    expires_in ActiveStorage::Blob.service.url_expires_in
+    expires_in ActiveStorage.service_urls_expire_in
     redirect_to @blob.service_url(disposition: params[:disposition])
   end
 end

activestorage/app/controllers/active_storage/representations_controller.rb

@@ -8,7 +8,7 @@ class ActiveStorage::RepresentationsController < ActiveStorage::BaseController
   include ActiveStorage::SetBlob
 
   def show
-    expires_in ActiveStorage::Blob.service.url_expires_in
+    expires_in ActiveStorage.service_urls_expire_in
     redirect_to @blob.representation(params[:variation_key]).processed.service_url(disposition: params[:disposition])
   end
 end

activestorage/app/models/active_storage/blob.rb

@@ -121,7 +121,7 @@ def text?
   # with users. Instead, the +service_url+ should only be exposed as a redirect from a stable, possibly authenticated URL.
   # Hiding the +service_url+ behind a redirect also gives you the power to change services without updating all URLs. And
   # it allows permanent URLs that redirect to the +service_url+ to be cached in the view.
-  def service_url(expires_in: service.url_expires_in, disposition: :inline, filename: nil, **options)
+  def service_url(expires_in: ActiveStorage.service_urls_expire_in, disposition: :inline, filename: nil, **options)
     filename = ActiveStorage::Filename.wrap(filename || self.filename)
 
     service.url key, expires_in: expires_in, filename: filename, content_type: content_type,
@@ -130,7 +130,7 @@ def service_url(expires_in: service.url_expires_in, disposition: :inline, filena
 
   # Returns a URL that can be used to directly upload a file for this blob on the service. This URL is intended to be
   # short-lived for security and only generated on-demand by the client-side JavaScript responsible for doing the uploading.
-  def service_url_for_direct_upload(expires_in: service.url_expires_in)
+  def service_url_for_direct_upload(expires_in: ActiveStorage.service_urls_expire_in)
     service.url_for_direct_upload key, expires_in: expires_in, content_type: content_type, content_length: byte_size, checksum: checksum
   end
 

activestorage/app/models/active_storage/variant.rb

@@ -79,7 +79,7 @@ def key
   # Use <tt>url_for(variant)</tt> (or the implied form, like +link_to variant+ or +redirect_to variant+) to get the stable URL
   # for a variant that points to the ActiveStorage::RepresentationsController, which in turn will use this +service_call+ method
   # for its redirection.
-  def service_url(expires_in: service.url_expires_in, disposition: :inline)
+  def service_url(expires_in: ActiveStorage.service_urls_expire_in, disposition: :inline)
     service.url key, expires_in: expires_in, disposition: disposition, filename: filename, content_type: content_type
   end
 

activestorage/lib/active_storage.rb

@@ -49,4 +49,5 @@ module ActiveStorage
   mattr_accessor :paths, default: {}
   mattr_accessor :variable_content_types, default: []
   mattr_accessor :content_types_to_serve_as_binary, default: []
+  mattr_accessor :service_urls_expire_in, default: 5.minutes
 end

activestorage/lib/active_storage/engine.rb

@@ -54,6 +54,7 @@ class Engine < Rails::Engine # :nodoc:
 
         ActiveStorage.variable_content_types = app.config.active_storage.variable_content_types || []
         ActiveStorage.content_types_to_serve_as_binary = app.config.active_storage.content_types_to_serve_as_binary || []
+        ActiveStorage.service_urls_expire_in = app.config.active_storage.service_urls_expire_in || 5.minutes
       end
     end
 

activestorage/lib/active_storage/service.rb

@@ -39,8 +39,6 @@ class Service
     extend ActiveSupport::Autoload
     autoload :Configurator
 
-    class_attribute :url_expires_in, default: 5.minutes
-
     class << self
       # Configure an Active Storage service by name from a set of configurations,
       # typically loaded from a YAML file. The Active Storage engine uses this

activestorage/test/models/blob_test.rb

@@ -151,16 +151,16 @@ class UserWithHasOneAttachedDependentFalse < User
   test "urls allow for custom options" do
     blob = create_blob(filename: "original.txt")
 
-    options = [
+    arguments = [
       blob.key,
-      expires_in: blob.service.url_expires_in,
+      expires_in: ActiveStorage.service_urls_expire_in,
       disposition: :inline,
       content_type: blob.content_type,
       filename: blob.filename,
       thumb_size: "300x300",
       thumb_mode: "crop"
     ]
-    assert_called_with(blob.service, :url, options) do
+    assert_called_with(blob.service, :url, arguments) do
       blob.service_url(thumb_size: "300x300", thumb_mode: "crop")
     end
   end

guides/source/configuring.md

@@ -822,6 +822,13 @@ text/javascript image/svg+xml application/postscript application/x-shockwave-fla
   config.active_storage.logger = ActiveSupport::Logger.new(STDOUT)
   ```
 
+* `config.active_storage.service_urls_expire_in` determines the default expiry of URLs generated by:
+  * `ActiveStorage::Blob#service_url`
+  * `ActiveStorage::Blob#service_url_for_direct_upload`
+  * `ActiveStorage::Variant#service_url`
+
+  The default is 5 minutes.
+
 ### Configuring a Database
 
 Just about every Rails application will interact with a database. You can connect to the database by setting an environment variable `ENV['DATABASE_URL']` or by using a configuration file called `config/database.yml`.