jwtinfo 0.6.1

Command line tool to get information about JWTs (Json Web Tokens)
Documentation 
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use clap::{Arg, ArgAction, Command};
use jwtinfo::jwt;
use serde_json::to_string_pretty;
use std::io::{self, Read};
use std::process;

#[doc(hidden)]
fn main() -> io::Result<()> {
    let matches = Command::new("jwtinfo")
        .version(env!("CARGO_PKG_VERSION"))
        .about("Shows information about a JWT (Json Web Token)")
        .args([
            Arg::new("header")
                .short('H')
                .long("header")
                .action(ArgAction::SetTrue)
                .conflicts_with("full")
                .help("Shows the token header rather than the body"),
            Arg::new("full")
                .short('F')
                .long("full")
                .action(ArgAction::SetTrue)
                .conflicts_with("header")
                .help("Shows both the token header and body"),
            Arg::new("pretty")
                .short('P')
                .long("pretty")
                .action(ArgAction::SetTrue)
                .help("Pretty prints the JWT header or body"),
            Arg::new("token")
                .index(1)
                .allow_hyphen_values(true)
                .required(true)
                .help("the JWT as a string (use \"-\" to read from stdin)"),
        ])
        .get_matches();

    let should_pretty_print = matches.get_flag("pretty");

    let mut token = matches.get_one::<String>("token").unwrap().clone();
    let mut buffer = String::new();

    // if the token is "-" read it from stdin
    if token == "-" {
        io::stdin().read_to_string(&mut buffer)?;
        token = (*buffer.trim()).to_string();
    }

    let jwt_token = match jwt::parse(token) {
        Ok(t) => t,
        Err(e) => {
            eprintln!("Error: {}", e);
            process::exit(1);
        }
    };

    let stringified = if matches.get_flag("full") {
        // Show both header and claims
        let full_output = serde_json::json!({
            "header": jwt_token.header,
            "claims": jwt_token.body
        });
        if should_pretty_print {
            to_string_pretty(&full_output)?
        } else {
            full_output.to_string()
        }
    } else {
        // Show either header or body
        let part = if matches.get_flag("header") {
            jwt_token.header
        } else {
            jwt_token.body
        };
        if should_pretty_print {
            to_string_pretty(&part)?
        } else {
            part.to_string()
        }
    };

    println!("{}", stringified);

    Ok(())
}