brightdigit/MistKit

public struct CharacterMapEncoder: MKTokenEncoder {
  public static let defaultCharacterMap = ["+": "%2B", "/": "%2F", "=": "%3D"]
  public let characterMap: [String: String]

  public init(characterMap: [String: String] = defaultCharacterMap) {
    self.characterMap = characterMap
  }

  public func encode(_ token: String) -> String {
    var encodedString = token

    for (find, replace) in characterMap {
      encodedString = encodedString.replacingOccurrences(
        of: find,
        with: replace
      )
    }

    return encodedString
  }
}