138 lines
3.7 KiB
Ruby
138 lines
3.7 KiB
Ruby
require 'erb'
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module Rack
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class LiveReload
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LIVERELOAD_JS_PATH = '/__rack/livereload.js'
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HEAD_TAG_REGEX = /<head>|<head[^(er)][^<]*>/
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BAD_USER_AGENTS = [ %r{MSIE} ]
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def livereload_local_uri
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"http://localhost:#{@port}/livereload.js"
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end
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attr_reader :app
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def initialize(app, options = {})
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@app, @options = app, options
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@port = @options[:live_reload_port] || 35729
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end
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def use_vendored?
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return @use_vendored if @use_vendored
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if @options[:source]
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@use_vendored = (@options[:source] == :vendored)
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else
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require 'net/http'
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require 'uri'
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uri = URI.parse(livereload_local_uri)
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http = Net::HTTP.new(uri.host, uri.port)
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http.read_timeout = 1
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begin
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http.send_request('GET', uri.path)
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@use_vendored = false
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rescue Timeout::Error, Errno::ECONNREFUSED, EOFError
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@use_vendored = true
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rescue => e
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$stderr.puts e.inspect
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raise e
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end
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end
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@use_vendored
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end
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def call(env)
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dup._call(env)
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end
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def _call(env)
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_, path, file = (env['PATH_INFO'] || '').split('/')
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if path == '__rack' && ::File.file?(target = ::File.expand_path("../../../js/#{file}", __FILE__))
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deliver_file(target)
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else
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status, headers, body = result = @app.call(env)
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if (headers['Content-Type'] and headers['Content-Type']['text/event-stream']) or headers['Transfer-Encoding'] == 'chunked'
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return result
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end
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body.close if body.respond_to?(:close)
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new_body = [] ; body.each { |line| new_body << line.to_s }
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if !ignored?(env['PATH_INFO']) and !bad_browser?(env['HTTP_USER_AGENT'])
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if headers['Content-Type'] and status == 200 and headers['Content-Type'][%r{text/html}]
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content_length = 0
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new_body.each do |line|
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if !headers['X-Rack-LiveReload'] && line['<head']
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host_to_use = (@options[:host] || env['HTTP_HOST'] || 'localhost').gsub(%r{:.*}, '')
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if use_vendored?
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src = LIVERELOAD_JS_PATH.dup + "?host=#{host_to_use}"
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else
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src = livereload_local_uri.dup.gsub('localhost', host_to_use) + '?'
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end
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src << "&mindelay=#{@options[:min_delay]}" if @options[:min_delay]
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src << "&maxdelay=#{@options[:max_delay]}" if @options[:max_delay]
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src << "&port=#{@options[:port]}" if @options[:port]
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template = ERB.new(::File.read(::File.expand_path('../../../skel/livereload.html.erb', __FILE__)))
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if line['<head']
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line.gsub!(HEAD_TAG_REGEX) { |match| %{#{match}#{template.result(binding)}} }
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end
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headers["X-Rack-LiveReload"] = '1'
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end
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content_length += line.bytesize
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end
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headers['Content-Length'] = content_length.to_s
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end
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end
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[ status, headers, new_body ]
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end
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end
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def ignored?(path_info)
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@options[:ignore] and @options[:ignore].any? { |filter| path_info[filter] }
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end
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def bad_browser?(user_agent)
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BAD_USER_AGENTS.any? { |pattern| (user_agent || '')[pattern] }
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end
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private
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def deliver_file(file)
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type = case ::File.extname(file)
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when '.js'
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'text/javascript'
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when '.swf'
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'application/swf'
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end
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[ 200, { 'Content-Type' => type, 'Content-Length' => ::File.size(file).to_s }, [ ::File.read(file) ] ]
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end
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def force_swf?
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@options[:force_swf]
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end
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def with_swf?
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!@options[:no_swf]
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end
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end
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end
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