NetNewsWire/Frameworks/Secrets/Secrets.swift.gyb

// Generated by Secrets.swift.gyb
%{
import os

secrets = ['FEED_WRANGLER_KEY', 'MERCURY_CLIENT_ID', 'MERCURY_CLIENT_SECRET', 'FEEDLY_CLIENT_ID', 'FEEDLY_CLIENT_SECRET', 'TWITTER_CONSUMER_KEY', 'TWITTER_CONSUMER_SECRET']

def chunks(seq, size):
  return (seq[i:(i + size)] for i in range(0, len(seq), size))

def encode(string, salt):
  bytes = string.encode("UTF-8")
  return [ord(bytes[i]) ^ salt[i % len(salt)] for i in range(0, len(bytes))]

def snake_to_camel(snake_str):
  components = snake_str.split('_')
  return components[0].lower() + ''.join(x.title() for x in components[1:])

salt = [ord(byte) for byte in os.urandom(64)]
}%
public enum Secrets {
  % for secret in secrets:

  public static var ${snake_to_camel(secret)}: String {
     let encoded: [UInt8] = [
      % for chunk in chunks(encode(os.environ.get(secret) or "", salt), 8):
          ${"".join(["0x%02x, " % byte for byte in chunk])}
      % end
      ]

      return decode(encoded, salt: salt)
  }
  % end

  %{
  # custom example: static let myVariable = "${os.environ.get('MY_CUSTOM_VARIABLE')}"
  }%
}

private extension Secrets {

  private static let salt: [UInt8] = [
  % for chunk in chunks(salt, 8):
    ${"".join(["0x%02x, " % byte for byte in chunk])}
  % end
  ]

  private static func decode(_ encoded: [UInt8], salt: [UInt8]) -> String {
    String(decoding: encoded.enumerated().map { (offset, element) in
        element ^ salt[offset % salt.count]
    }, as: UTF8.self)
  }

}