ipa_utils.rb

require 'zip'
require 'zip/zipfilesystem'
require 'openssl'
require 'nokogiri'

class Ipa

	attr_accessor :ipa_path, :package_name

	def initialize(ipa_path)
		@ipa_path = ipa_path
		@package_name = Zip::ZipFile.open(ipa_path, 0) {|zip| zip.dir.entries('Payload') }.first
	end

	# ProvisioningFile

		def devices
			parse_plist(
				provisioning_file.entries[1]
					.value.entries[0]
						.value.entries[2]
							.value.entries[1]
								.value.entries[0]
									.value).xpath("//key[.='ProvisionedDevices']/following-sibling::array")
										.first.content.split
		end

		def provisioning_file
			@provisioning_file ||= OpenSSL::ASN1.decode read('embedded.mobileprovision')
		end

	# Plutil
		
		def parse_plist(plist_data)
			Nokogiri::XML(
				begin
					plist = Tempfile.new(package_name)
					plist.write plist_data
					plist.rewind
					%x(plutil -convert xml1 #{plist.path} -o -).strip
				ensure
					plist.close
					plist.unlink
				end
			)
		end

	# InfoPlist
		
		def info_plist
			@info_plist ||= parse_plist(read('Info.plist'))
		end

		def info_plist_key(key)
			info_plist.xpath("//key[.='#{key}']/following-sibling::string").first.content
		end

		def icon_file
			info_plist_key 'CFBundleIconFile'
		end

		def bundle_identifier
			info_plist_key 'CFBundleIdentifier'
		end

		def bundle_display_name
			info_plist_key 'CFBundleDisplayName'
		end

	# Helpers

		def read(payload_path)
			Zip::ZipFile.open(ipa_path, 0) {|zip| zip.read("Payload/#{package_name}/#{payload_path}") }
		end

		def icon
			read icon_file
		end

end