Module: Extensionator::CRX

Defined in:
lib/extensionator/crx.rb

Class Method Summary collapse

Class Method Details

.create(destination, zip_str, priv_key) ⇒ Object 



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# 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) ⇒ Object 



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# File 'lib/extensionator/crx.rb', line 30

def self.format_size(num)
  [num].pack("V")
end

.sign(zip_str, priv_key) ⇒ Object 



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# 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) ⇒ Object 



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# 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