Extract the rendering of public exceptions pages into a Rack app.

1 files changed, 30 insertions, 0 deletions

diff --git a/actionpack/lib/action_dispatch/middleware/public_exceptions.rb b/actionpack/lib/action_dispatch/middleware/public_exceptions.rb
new file mode 100644
index 0000000000..6600d6232e
--- /dev/null
+++ b/actionpack/lib/action_dispatch/middleware/public_exceptions.rb
@@ -0,0 +1,30 @@
+module ActionDispatch
+  # A simple Rack application that renders exceptions in the given public path.
+  class PublicExceptions
+    attr_accessor :public_path
+
+    def initialize(public_path)
+      @public_path = public_path
+    end
+
+    def call(env)
+      status      = env["PATH_INFO"][1..-1]
+      locale_path = "#{public_path}/#{status}.#{I18n.locale}.html" if I18n.locale
+      path        = "#{public_path}/#{status}.html"
+
+      if locale_path && File.exist?(locale_path)
+        render(status, File.read(locale_path))
+      elsif File.exist?(path)
+        render(status, File.read(path))
+      else
+        render(status, '')
+      end
+    end
+
+    private
+
+    def render(status, body)
+      [status, {'Content-Type' => "text/html; charset=#{Response.default_charset}", 'Content-Length' => body.bytesize.to_s}, [body]]
+    end
+  end
+end
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