7 files changed, 31 insertions, 4 deletions
diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index a06484ea20..4e26a2a60e 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,11 @@
+*   `FileHandler` and `Static` middleware initializers accept `index` argument
+    to configure the directory index file name. Defaults to `index` (as in
+    `index.html`).
+
+    See #20017.
+
+    *Eliot Sykes*
+
 *   Deprecate `:nothing` option for `render` method.
 
     *Mehmet Emin İNAÇ*
diff --git a/actionpack/lib/action_dispatch/middleware/static.rb b/actionpack/lib/action_dispatch/middleware/static.rb
index bc5ef1abc9..f20f6ca865 100644
--- a/actionpack/lib/action_dispatch/middleware/static.rb
+++ b/actionpack/lib/action_dispatch/middleware/static.rb
@@ -13,11 +13,12 @@ module ActionDispatch
   # located at `public/assets/application.js` if the file exists. If the file
   # does not exist, a 404 "File not Found" response will be returned.
   class FileHandler
-    def initialize(root, cache_control)
+    def initialize(root, cache_control, index)
       @root          = root.chomp('/')
       @compiled_root = /^#{Regexp.escape(root)}/
       headers        = cache_control && { 'Cache-Control' => cache_control }
       @file_server = ::Rack::File.new(@root, headers)
+      @index = index
     end
 
 
@@ -32,7 +33,7 @@ module ActionDispatch
       return false unless path.valid_encoding?
       path = Rack::Utils.clean_path_info path
 
-      paths = [path, "#{path}#{ext}", "#{path}/index#{ext}"]
+      paths = [path, "#{path}#{ext}", "#{path}/#{@index}#{ext}"]
 
       if match = paths.detect { |p|
         path = File.join(@root, p.force_encoding('UTF-8'))
@@ -104,9 +105,9 @@ module ActionDispatch
   # produce a directory traversal using this middleware. Only 'GET' and 'HEAD'
   # requests will result in a file being returned.
   class Static
-    def initialize(app, path, cache_control=nil)
+    def initialize(app, path, cache_control=nil, index="index")
       @app = app
-      @file_handler = FileHandler.new(path, cache_control)
+      @file_handler = FileHandler.new(path, cache_control, index)
     end
 
     def call(env)
diff --git a/actionpack/test/dispatch/static_test.rb b/actionpack/test/dispatch/static_test.rb
index 93e5c85a97..e729cc44f9 100644
--- a/actionpack/test/dispatch/static_test.rb
+++ b/actionpack/test/dispatch/static_test.rb
@@ -57,6 +57,7 @@ module StaticTests
 
   def test_serves_static_index_file_in_directory
     assert_html "/foo/index.html", get("/foo/index.html")
+    assert_html "/foo/index.html", get("/foo/index")
     assert_html "/foo/index.html", get("/foo/")
     assert_html "/foo/index.html", get("/foo")
   end
@@ -260,6 +261,19 @@ class StaticTest < ActiveSupport::TestCase
     }
     assert_equal(DummyApp.call(nil), @app.call(env))
   end
+
+  def test_non_default_static_index
+    @app = ActionDispatch::Static.new(DummyApp, @root, "public, max-age=60", "other-index")
+    assert_html "/other-index.html", get("/other-index.html")
+    assert_html "/other-index.html", get("/other-index")
+    assert_html "/other-index.html", get("/")
+    assert_html "/other-index.html", get("")
+    assert_html "/foo/other-index.html", get("/foo/other-index.html")
+    assert_html "/foo/other-index.html", get("/foo/other-index")
+    assert_html "/foo/other-index.html", get("/foo/")
+    assert_html "/foo/other-index.html", get("/foo")
+  end
+
 end
 
 class StaticEncodingTest < StaticTest
diff --git a/actionpack/test/fixtures/public/foo/other-index.html b/actionpack/test/fixtures/public/foo/other-index.html
new file mode 100644
index 0000000000..51c90c26ea
--- /dev/null
+++ b/actionpack/test/fixtures/public/foo/other-index.html
@@ -0,0 +1 @@
+/foo/other-index.html
+\ No newline at end of file
diff --git a/actionpack/test/fixtures/public/other-index.html b/actionpack/test/fixtures/public/other-index.html
new file mode 100644
index 0000000000..0820dfcb6e
--- /dev/null
+++ b/actionpack/test/fixtures/public/other-index.html
@@ -0,0 +1 @@
+/other-index.html
+\ No newline at end of file
diff --git a/actionpack/test/fixtures/公共/foo/other-index.html b/actionpack/test/fixtures/公共/foo/other-index.html
new file mode 100644
index 0000000000..51c90c26ea
--- /dev/null
+++ b/actionpack/test/fixtures/公共/foo/other-index.html
@@ -0,0 +1 @@
+/foo/other-index.html
+\ No newline at end of file
diff --git a/actionpack/test/fixtures/公共/other-index.html b/actionpack/test/fixtures/公共/other-index.html
new file mode 100644
index 0000000000..0820dfcb6e
--- /dev/null
+++ b/actionpack/test/fixtures/公共/other-index.html
@@ -0,0 +1 @@
+/other-index.html
+\ No newline at end of file