Updates to support Rails 5, Rack 3 and Sinatra 2 (beta) (#1984)

* Updates to support Rails 5, Rack 3 and Sinatra 2 (beta).

- Bump upper boundary of version for Rack dependency from 2.0 to 3 (exclusive).
- Version bump sinatra for CI testing to >= 2.0.0.beta2.
- Also replaces use of String#hash in middleman-core/features/asset_host.feature
to ensure sufficiently random variables are returned.

Closes middleman/middleman#1983.

* Testing revert of the version requirements...

To confirm my changes don't cause a regression for any of:
- Rails < 5
- Sinatra < 2
- Rack < 2

* Revert "Testing revert of the version requirements..."

This reverts commit 5cf4c2a07c0814eefa573358b1bc9b0eeb62f9c1.

Gemfile

@@ -18,7 +18,7 @@ gem 'kramdown', '~> 1.2', require: false
 gem 'slim', '>= 2.0', require: false
 gem 'liquid', '>= 2.6', require: false
 gem 'stylus', '>= 1.0', require: false
-gem 'sinatra', '>= 1.4', require: false
+gem 'sinatra', '>= 2.0.0.beta2', require: false
 gem 'redcarpet', '>= 3.1', require: false
 
 # Dns server to test preview server

middleman-core/features/asset_host.feature

@@ -25,7 +25,8 @@ Feature: Alternate between multiple asset hosts
     And a file named "config.rb" with:
       """
       activate :asset_host, host: Proc.new { |asset|
-        "http://assets%d.example.com" % (asset.hash % 4)
+        hash = Digest::MD5.digest(asset).bytes.map!(&:ord).reduce(&:+)
+        "http://assets%d.example.com" % (hash % 4)
       }
       """
     And the Server is running

middleman-core/lib/middleman-core/extensions/minify_css.rb

@@ -72,7 +72,7 @@ class Middleman::Extensions::MinifyCss < ::Middleman::Extension
       end
 
       if minified
-        headers['Content-Length'] = ::Rack::Utils.bytesize(minified).to_s
+        headers['Content-Length'] = minified.bytesize.to_s
         response = [minified]
       end
 

middleman-core/lib/middleman-core/extensions/minify_javascript.rb

@@ -64,7 +64,7 @@ class Middleman::Extensions::MinifyJavascript < ::Middleman::Extension
       end
 
       if minified
-        headers['Content-Length'] = ::Rack::Utils.bytesize(minified).to_s
+        headers['Content-Length'] = minified.bytesize.to_s
         response = [minified]
       end
 

middleman-core/lib/middleman-core/rack.rb

@@ -134,8 +134,14 @@ module Middleman
     # Immediately send static file
     def send_file(resource, env)
       file     = ::Rack::File.new nil
-      file.path = resource.file_descriptor[:full_path]
+      path     = resource.file_descriptor[:full_path]
+      if !file.respond_to?(:path=)
+        request  = ::Rack::Request.new(env)
+        response = file.serving(request, path)
+      else
+        file.path = path
         response = file.serving(env)
+      end
       status = response[0]
       response[1]['Content-Encoding'] = 'gzip' if %w(.svgz .gz).include?(resource.ext)
       # Do not set Content-Type if status is 1xx, 204, 205 or 304, otherwise

middleman-core/middleman-core.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
 
   # Core
   s.add_dependency('bundler', ['~> 1.1'])
-  s.add_dependency('rack', ['>= 1.4.5', '< 2.0'])
+  s.add_dependency('rack', ['>= 1.4.5', '< 3'])
   s.add_dependency('tilt', ['~> 2.0'])
   s.add_dependency('erubis')
   s.add_dependency('fast_blank')