feat: Add support for Linux

Closes #51

Author: kylef

Sources/Base64.swift

@@ -4,7 +4,7 @@ import Foundation
 /// URI Safe base64 encode
 func base64encode(_ input:Data) -> String {
   let data = input.base64EncodedData(options: NSData.Base64EncodingOptions(rawValue: 0))
-  let string = NSString(data: data, encoding: String.Encoding.utf8.rawValue) as! String
+  let string = String(data: data, encoding: .utf8)!
   return string
     .replacingOccurrences(of: "+", with: "-", options: NSString.CompareOptions(rawValue: 0), range: nil)
     .replacingOccurrences(of: "/", with: "_", options: NSString.CompareOptions(rawValue: 0), range: nil)

Sources/JWT.swift

@@ -81,7 +81,7 @@ public func encode(_ payload:Payload, algorithm:Algorithm) -> String {
     return nil
   }
 
-  let header = encodeJSON(["typ": "JWT" as AnyObject, "alg": algorithm.description as AnyObject])!
+  let header = encodeJSON(["typ": "JWT", "alg": algorithm.description])!
   let payload = encodeJSON(payload)!
   let signingInput = "\(header).\(payload)"
   let signature = algorithm.sign(signingInput)
@@ -91,25 +91,25 @@ public func encode(_ payload:Payload, algorithm:Algorithm) -> String {
 open class PayloadBuilder {
   var payload = Payload()
 
-  open var issuer:String? {
+  open var issuer: String? {
     get {
       return payload["iss"] as? String
     }
     set {
-      payload["iss"] = newValue as AnyObject?
+      payload["iss"] = newValue
     }
   }
 
-  open var audience:String? {
+  open var audience: String? {
     get {
       return payload["aud"] as? String
     }
     set {
-      payload["aud"] = newValue as AnyObject?
+      payload["aud"] = newValue
     }
   }
 
-  open var expiration:Date? {
+  open var expiration: Date? {
     get {
       if let expiration = payload["exp"] as? TimeInterval {
         return Date(timeIntervalSince1970: expiration)
@@ -118,11 +118,11 @@ open class PayloadBuilder {
       return nil
     }
     set {
-      payload["exp"] = newValue?.timeIntervalSince1970 as AnyObject?
+      payload["exp"] = newValue?.timeIntervalSince1970
     }
   }
 
-  open var notBefore:Date? {
+  open var notBefore: Date? {
     get {
       if let notBefore = payload["nbf"] as? TimeInterval {
         return Date(timeIntervalSince1970: notBefore)
@@ -131,11 +131,11 @@ open class PayloadBuilder {
       return nil
     }
     set {
-      payload["nbf"] = newValue?.timeIntervalSince1970 as AnyObject?
+      payload["nbf"] = newValue?.timeIntervalSince1970
     }
   }
 
-  open var issuedAt:Date? {
+  open var issuedAt: Date? {
     get {
       if let issuedAt = payload["iat"] as? TimeInterval {
         return Date(timeIntervalSince1970: issuedAt)
@@ -144,11 +144,11 @@ open class PayloadBuilder {
       return nil
     }
     set {
-      payload["iat"] = newValue?.timeIntervalSince1970 as AnyObject?
+      payload["iat"] = newValue?.timeIntervalSince1970
     }
   }
 
-  open subscript(key: String) -> Any {
+  open subscript(key: String) -> Any? {
     get {
       return payload[key]
     }