gistfile1.rb

require 'sinatra'
require 'aws-sdk'
require 'digest/md5'
require 'dotenv'
Dotenv.load

$project_name = 'no-country'
$input_file = './index.html'

class S3Upload
	def perform(options={})
		# kword args: access_key, access_secret, bucket, key, contents
		# returns public url
		
		url = AWS::S3.new(
			access_key_id:     options[:access_key], 
			secret_access_key: options[:access_secret]
		)
		.buckets[options[:bucket]]
		.objects[options[:key]]
		.write(
		 	options[:contents], 
		 	acl: options[:acl] || :public_read
		).public_url.to_s

		puts "S3Uploaded: #{url}"

		return url

	end
end

class Inliner

	def initialize(input_file)
		@input_file = input_file
		@scripts = []
		@styles = []
	end

	def get_args(input)
		input.split(' ').inject({}) {|obj, item|
			k, v = item.split('=')
			obj[k.to_sym] = (v || '').gsub("'", "").gsub('"', "")
			obj
		}
	end

	def resolve_file(relative_path)
		File.expand_path(relative_path, File.dirname(@input_file))
	end

	def read_file(relative_path)
		File.open( resolve_file(relative_path) ).read
	rescue
		"<!-- problem opening #{relative_path} (#{resolve_file(relative_path)}) -->"
	end

	def script(body)
		re = /\<script(.*)\>(.*)\<\/script\>/
		output = body.gsub(re) do |capture|
			args = get_args($1)
			if args[:src].include?('jquery') or args[:src].include?('underscore')
				puts "skipping #{args[:src]}"
			else
				@scripts << read_file(args[:src])
			end
		end
		@scripts
	end

	def style(body)
		re = /\<link(.*)\>/
		output = body.gsub(re) do |capture|
			args = get_args($1)			
			@styles << read_file(args[:href])
		end
		@styles
	end

	def get_body
		@file_body ||= File.open(@input_file).read
	end

	def compressed_scripts		
		script( get_body() )
			.join("\n\n")
			.gsub(/^\/\/\# sourceMappingURL=(.+).map$/, "") # remove source maps
	end

	def compressed_styles
		style( get_body() )
			.join("\n\n")
	end
		
end

def md5(input)
	Digest::MD5.hexdigest(input)
end

get '/' do		
	publish()
	erb :publish
end

def publish	
	inliner = Inliner.new($input_file)
	js_text = inliner.compressed_scripts
	js_key  = "production/#{$project_name}/#{md5(js_text)}.js"
	@js_url = upload(js_key, js_text)

	css_text = inliner.compressed_styles
	css_key  = "production/#{$project_name}/#{md5(css_text)}.css"
	@css_url = upload(css_key, css_text)
end

def upload(key, html)
	url = S3Upload.new.perform(
		access_key: ENV['S3_KEY'],
		access_secret: ENV['S3_SECRET'],
		bucket: ENV['S3_BUCKET'],
		key: key,
		contents: html
	)
	return url
end