module Extensionator::CRX

Public Class Methods

create(destination, zip_str, priv_key) click to toggle source
# File lib/extensionator/crx.rb, line 6
def self.create(destination, zip_str, priv_key)
  sig_bytes = sign(zip_str, priv_key)
  write_crx(destination, zip_str, sig_bytes, priv_key)
end
format_size(num) click to toggle source
# File lib/extensionator/crx.rb, line 30
def self.format_size(num)
  [num].pack("V")
end
sign(zip_str, priv_key) click to toggle source
# File lib/extensionator/crx.rb, line 11
def self.sign(zip_str, priv_key)
  priv_key.sign(OpenSSL::Digest::SHA1.new, zip_str)
end
write_crx(destination, zip_str, sig_bytes, priv_key) click to toggle source
# File lib/extensionator/crx.rb, line 15
def self.write_crx(destination, zip_str, sig_bytes, priv_key)
  pub_key_bytes = priv_key.public_key.to_der

  #See https://developer.chrome.com/extensions/crx for the format description
  File.open(destination, "wb") do |file|
    file << "Cr24"
    file << format_size(2)
    file << format_size(pub_key_bytes.size)
    file << format_size(sig_bytes.size)
    file << pub_key_bytes
    file << sig_bytes
    file << zip_str
  end
end