NetNewsWire/Shared/Secrets.swift.gyb

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

secrets = ['FEED_WRANGLER_KEY']

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)]
}%
enum Secrets {

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

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

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)
  }

}