use std::env;

extern crate jsonwebtoken as jwt;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;

use jwt::errors::ErrorKind;
use jwt::dangerous_unsafe_decode;

#[derive(Debug, Serialize, Deserialize)]
struct Claims {
    aud: String,
    exp: f64,
    iss: String,
    sub: String,
    scope: String,
}

fn main() {
    let mut tokens = env::args();
    tokens.next();
    for token in tokens {
        decode_token(&token);
    }
}


fn decode_token(token: &str) {
    let data =
        match dangerous_unsafe_decode::<Claims>(&token) {
            Ok(c) => c,
            Err(err) => match *err.kind() {
                ErrorKind::InvalidToken => panic!("invalid token"),
                _ => {
                    println!("{:?}", err);
                    panic!();
                },
            },
        };
    let claims = data.claims;
    let j = serde_json::to_string_pretty(&claims).expect("JSON error");
    println!("{}", j);
}