Add uploader

.gitignore

@@ -0,0 +1 @@
+/public/

Gemfile

@@ -1,3 +1,4 @@
 source "https://rubygems.org/"
 
 gem "rake"
+gem "puma"

Gemfile.lock

@@ -1,10 +1,14 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    rake (10.3.1)
+    puma (2.8.2)
+      rack (>= 1.1, < 2.0)
+    rack (1.5.2)
+    rake (10.3.2)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  puma
   rake

Procfile

@@ -1 +1 @@
-web: bundle exec ruby -run -e httpd -- --port=$PORT --do-not-reverse-lookup .
+web: bundle exec puma --port $PORT config.ru

config.ru

@@ -0,0 +1,81 @@
+# -*- ruby -*-
+
+require "fileutils"
+
+class Uploader
+  class ValidationError < StandardError
+  end
+
+  def initialize(request, response)
+    @request = request
+    @response = response
+    @response["Content-Type"] = "text/plain"
+  end
+
+  def run
+    begin
+      validate
+    rescue ValidationError
+    else
+      upload
+    end
+
+    @response.finish
+  end
+
+  private
+  def validate
+    validate_method
+    validate_path
+    validate_content
+  end
+
+  def validation_error(message)
+    @response.status = 400
+    @response.write(message)
+    raise ValidationError
+  end
+
+  def validate_method
+    return if @request.put?
+    validation_error("must be PUT\n")
+  end
+
+  def validate_path
+    return unless @request.path.end_with?("/")
+    validation_error("must be file name\n")
+  end
+
+  def validate_content
+    return if @request.body
+    validation_error("body is required\n")
+  end
+
+  def upload
+    path = "public#{@request.path}"
+    FileUtils.mkdir_p(File.dirname(path))
+    File.open(path, "wb") do |output|
+      buffer_size = 8912
+      buffer = ""
+      while @request.body.read(buffer_size, buffer)
+        output.write(buffer)
+      end
+    end
+
+    @response.write("Uploaded\n")
+  end
+end
+
+file_server = Rack::File.new("public")
+
+application = lambda do |env|
+  request = Rack::Request.new(env)
+  response = Rack::Response.new
+  if request.get?
+    file_server.call(env)
+  else
+    uploader = Uploader.new(request, response)
+    uploader.run
+  end
+end
+run application