makepass.rb

#!/usr/bin/env ruby

require 'json'
require 'digest/sha1'
require "openssl"

pass = {
  "formatVersion" => 1
}

# add pass meta data
pass["passTypeIdentifier"] = "pass.com.drobnik.movienight"
pass["serialNumber"] = "001"
pass["teamIdentifier"] = "Z7L2YCUH45"
pass["organizationName"] = "Cocoanetics"
pass["logoText"] = "Cocoanetics"
pass["description"] = "VIP Movie Night Sofa Seat"

# create the barcode
barcode = { 
  "format" => "PKBarcodeFormatPDF417",
  "messageEncoding" => "UTF8"
}

barcode["message"] = "2014-01-01T12:00 Seat 01"
pass["barcode"] = barcode

# header fields
headerFields = [{
  "key" => "seat",
  "label" => "Seat",
  "value" => "1B"
}]
                  
# primary fields                  
primaryFields = [{
  "key" => "name",
  "value" => "VIP Movie Night"
}]                  

# secondary fields                  
secondaryFields = [{
  "key" => "location",
  "label" => "Location",
  "value" => "Oliver's Home Movie Theater"
}]                  

# auxiliary fields
auxiliaryFields = [{
  "key" => "date",
  "label" => "Event Date",
  "dateStyle" => "PKDateStyleMedium",      
  "timeStyle" => "PKDateStyleShort",
  "value" => "2014-07-24T18:00Z"  
}]
 
# fields on back of pass
backFields = [
  {
  "key" => "phone",
  "label" => "For more info",
  "value" => "800-1234567890"
  },
  {
  "key" => "terms",
  "label" => "TERMS AND CONDITIONS",
  "value" => "Free popcorn and drink at entrance. Please arrive sufficiently early to pick your seat and allow show to start on time."
  }
] 
                  
# put ticket fields together                  
eventTicketFields = {
  "headerFields" => headerFields,
  "primaryFields" => primaryFields,
  "secondaryFields" => secondaryFields,
  "auxiliaryFields" => auxiliaryFields,
  "backFields" => backFields
}

pass["eventTicket"] = eventTicketFields
                  
# create pass JSON string
passJSON = JSON.pretty_generate(pass)

# get SHA1 of pass JSON
passSHA1 = Digest::SHA1.hexdigest passJSON

# files that are possible in pkpass
possibleResources = ['icon.png', 'icon@2x.png', 
                     'thumbnail.png', 'thumbnail@2x.png', 
                     'strip.png', 'strip@2x.png', 
                     'logo.png', 'logo@2x.png', 
                     'background.png', 'background@2x.png']

# filter possible resources with actual files in folder
resources = possibleResources & Dir['*']

# first file is the JSON 
manifest = {"pass.json" => passSHA1}

# keep track of files to put in ZIP
zipCommand = ["zip", "-q", "new.pkpass", "pass.json", "signature", "manifest.json"]

# iterate over resources
resources.each do |resource_file|
  # load file contents into variable
  file = File.open(resource_file, "rb")
  contents = file.read
  
  # get resource SHA1
  contents_SHA1 = Digest::SHA1.hexdigest contents
  
  # add resource file and SHA1 to manifest hash
  manifest[resource_file] = contents_SHA1
  zipCommand << resource_file
end

# create manifest JSON string
manifestJSON = JSON.pretty_generate(manifest)

# write manifest to disk
manifest_file = open("manifest.json", "w") 
manifest_file.write(manifestJSON)
manifest_file.close

# write pass file to disk
pass_file = open("pass.json", "w")
pass_file.write(passJSON)
pass_file.close

# create signature
root_cert = OpenSSL::X509::Certificate.new File.read('WWDR.pem')
key = OpenSSL::PKey::RSA.new File.read('passkey.pem'), '12345'
certificate = OpenSSL::X509::Certificate.new File.read('passcertificate.pem')
signature = OpenSSL::PKCS7.sign(certificate, key, manifestJSON, [root_cert], OpenSSL::PKCS7::BINARY | OpenSSL::PKCS7::DETACHED).to_der

# write signature to disk
signature_file = open("signature", "wb")
signature_file.write signature
signature_file.close

# execute zip command
system(*zipCommand)