Move webrick library into internal test toolchain

Merged: https://github.com/ruby/ruby/pull/3729

tool/lib/webrick/httpservlet/erbhandler.rb

@@ -0,0 +1,88 @@
+# frozen_string_literal: false
+#
+# erbhandler.rb -- ERBHandler Class
+#
+# Author: IPR -- Internet Programming with Ruby -- writers
+# Copyright (c) 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou
+# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
+# reserved.
+#
+# $IPR: erbhandler.rb,v 1.25 2003/02/24 19:25:31 gotoyuzo Exp $
+
+require_relative 'abstract'
+
+require 'erb'
+
+module WEBrick
+  module HTTPServlet
+
+    ##
+    # ERBHandler evaluates an ERB file and returns the result.  This handler
+    # is automatically used if there are .rhtml files in a directory served by
+    # the FileHandler.
+    #
+    # ERBHandler supports GET and POST methods.
+    #
+    # The ERB file is evaluated with the local variables +servlet_request+ and
+    # +servlet_response+ which are a WEBrick::HTTPRequest and
+    # WEBrick::HTTPResponse respectively.
+    #
+    # Example .rhtml file:
+    #
+    #   Request to <%= servlet_request.request_uri %>
+    #
+    #   Query params <%= servlet_request.query.inspect %>
+
+    class ERBHandler < AbstractServlet
+
+      ##
+      # Creates a new ERBHandler on +server+ that will evaluate and serve the
+      # ERB file +name+
+
+      def initialize(server, name)
+        super(server, name)
+        @script_filename = name
+      end
+
+      ##
+      # Handles GET requests
+
+      def do_GET(req, res)
+        unless defined?(ERB)
+          @logger.warn "#{self.class}: ERB not defined."
+          raise HTTPStatus::Forbidden, "ERBHandler cannot work."
+        end
+        begin
+          data = File.open(@script_filename, &:read)
+          res.body = evaluate(ERB.new(data), req, res)
+          res['content-type'] ||=
+            HTTPUtils::mime_type(@script_filename, @config[:MimeTypes])
+        rescue StandardError
+          raise
+        rescue Exception => ex
+          @logger.error(ex)
+          raise HTTPStatus::InternalServerError, ex.message
+        end
+      end
+
+      ##
+      # Handles POST requests
+
+      alias do_POST do_GET
+
+      private
+
+      ##
+      # Evaluates +erb+ providing +servlet_request+ and +servlet_response+ as
+      # local variables.
+
+      def evaluate(erb, servlet_request, servlet_response)
+        Module.new.module_eval{
+          servlet_request.meta_vars
+          servlet_request.query
+          erb.result(binding)
+        }
+      end
+    end
+  end
+end