require 'rack'
require 'opal/source_map'
require 'sprockets'
require 'sourcemap'
require 'erb'
require 'opal/sprockets/source_map_server'
require 'opal/sprockets/source_map_header_patch'
module Opal
class Server
SOURCE_MAPS_PREFIX_PATH = '/__OPAL_SOURCE_MAPS__'
attr_accessor :debug, :use_index, :index_path, :main, :public_root,
:public_urls, :sprockets, :prefix
def initialize options = {}
@use_index = true
@public_root = nil
@public_urls = ['/']
@sprockets = options.fetch(:sprockets, ::Sprockets::Environment.new)
@debug = options.fetch(:debug, true)
@prefix = options.fetch(:prefix, '/assets')
Opal.paths.each { |p| @sprockets.append_path(p) }
yield self if block_given?
create_app
end
def public_dir=(dir)
@public_root = dir
@public_urls = ["/"]
end
def source_map=(enabled)
Opal::Config.source_map_enabled = enabled
end
def source_map_enabled
Opal::Config.source_map_enabled
end
def append_path path
@sprockets.append_path path
end
def use_gem gem_name
@sprockets.use_gem gem_name
end
def create_app
server, sprockets, prefix = self, @sprockets, self.prefix
sprockets.logger.level ||= Logger::DEBUG
source_map_enabled = self.source_map_enabled
if source_map_enabled
maps_prefix = SOURCE_MAPS_PREFIX_PATH
maps_app = SourceMapServer.new(sprockets, maps_prefix)
::Opal::Sprockets::SourceMapHeaderPatch.inject!(maps_prefix)
end
@app = Rack::Builder.app do
not_found = lambda { |env| [404, {}, []] }
use Rack::Deflater
use Rack::ShowExceptions
use Index, server if server.use_index
if source_map_enabled
map(maps_prefix) do
use Rack::ConditionalGet
use Rack::ETag
run maps_app
end
end
map(prefix) { run sprockets }
run Rack::Static.new(not_found, root: server.public_root, urls: server.public_urls)
end
end
def call(env)
@app.call env
end
class Index
def initialize(app, server)
@app = app
@server = server
@index_path = server.index_path
end
def call(env)
if %w[/ /index.html].include? env['PATH_INFO']
[200, { 'Content-Type' => 'text/html' }, [html]]
else
@app.call env
end
end
# Returns the html content for the root path. Supports ERB
def html
if @index_path
raise "index does not exist: #{@index_path}" unless File.exist?(@index_path)
Tilt.new(@index_path).render(self)
else
raise "Main asset path not configured (set 'main' within Opal::Server.new block)" if @server.main.nil?
source
end
end
def javascript_include_tag name
sprockets = @server.sprockets
prefix = @server.prefix
debug = @server.debug
::Opal::Sprockets.javascript_include_tag(name, sprockets: sprockets, prefix: prefix, debug: debug)
end
def source
<<-HTML
Opal Server
#{javascript_include_tag @server.main}
HTML
end
end
end
end