ProfAvery/image_upload.rb

## image_upload.rb
#!/usr/bin/env ruby

require 'sinatra'
require 'redis'

configure do
  REDIS = Redis.new
end

get '/' do
  erb :index
end

get '/images/:filename' do
  filename = params[:filename]
  data = REDIS.get "image:#{filename}"
  if data.nil?
    halt 404
  end
  content_type REDIS.get "content-type:#{filename}"
  data
end

post '/' do
  file_info = params[:file]
  redirect '/' if file_info.nil?
  @filename = file_info[:filename]
  REDIS.set "image:#{@filename}", file_info[:tempfile].read
  REDIS.set "content-type:#{@filename}", file_info[:type]
  erb :index
end

__END__
@@index
<!DOCTYPE html>
<html>
  <head>
    <title>Image Upload Test</title>
  </head>
  <body>
    <h1>Upload an image</h1>
    <form method="POST" action="/" enctype="multipart/form-data" />
      <input type="file" size="50" name="file" />
      <input type="submit" />
    </form>
    <% if @filename %>
      <img src="/images/<%= @filename %>" />
    <% end %>
  </body>
</html>
	#!/usr/bin/env ruby

	require 'sinatra'
	require 'redis'

	configure do
	REDIS = Redis.new
	end

	get '/' do
	erb :index
	end

	get '/images/:filename' do
	filename = params[:filename]
	data = REDIS.get "image:#{filename}"
	if data.nil?
	halt 404
	end
	content_type REDIS.get "content-type:#{filename}"
	data
	end

	post '/' do
	file_info = params[:file]
	redirect '/' if file_info.nil?
	@filename = file_info[:filename]
	REDIS.set "image:#{@filename}", file_info[:tempfile].read
	REDIS.set "content-type:#{@filename}", file_info[:type]
	erb :index
	end

	__END__
	@@index
	<!DOCTYPE html>
	<html>
	<head>
	<title>Image Upload Test</title>
	</head>
	<body>
	<h1>Upload an image</h1>
	<form method="POST" action="/" enctype="multipart/form-data" />
	<input type="file" size="50" name="file" />
	<input type="submit" />
	</form>
	<% if @filename %>
	<img src="/images/<%= @filename %>" />
	<% end %>
	</body>
	</html>