iOS JWT解析

JWT 的详细使用： 解析JWT

extension String {

    func jwtDecode()->[String:Any]{

        /**分割为数组*/

        let segments  = components(separatedBy:".")

        /**获取第二个元素Payload负载元素(有意义的key就在里面解析的)*/

        var base64String =   segments[1] 

        /**base64解码*/

        let requiredLength = (4*ceil((Float)(base64String.count)/4.0))

        let nbrPaddings =Int(requiredLength) - base64String.count

        if  nbrPaddings >0{

            let   pading = "".padding(toLength: nbrPaddings,withPad:"=",startingAt:0)

            base64String = base64String + pading

        }

        base64String = base64String.replacingOccurrences(of:"-",with:"+")

        base64String = base64String.replacingOccurrences(of:"_",with:"/")

        let decodeData =Data(base64Encoded: base64String,options:Data.Base64DecodingOptions.ignoreUnknownCharacters)

        let decodeString =String.init(data: decodeData!,encoding:String.Encoding.utf8)

        /**转为字典*/

        let  jsonDict:[String : Any]? = try? (JSONSerialization.jsonObject(with:(decodeString?.data(using: String.Encoding.utf8))!,options: JSONSerialization.ReadingOptions.mutableContainers) as! [String : Any])

        /**返回jwt */

        return   jsonDict ?? [:]

    }

}