jwt

gistfile1.txt

import (
    "encoding/base64"
    "strings"
)

func decodeJWT(jwt string) ([]byte, error) {
    // Split the JWT into its three parts
    parts := strings.Split(jwt, ".")
    if len(parts) != 3 {
        return nil, errors.New("invalid JWT format")
    }

    // Decode the payload, with proper padding and URL decoding
    payload, err := base64.URLEncoding.DecodeString(addPadding(parts[1]))
    if err != nil {
        return nil, err
    }

    return payload, nil
}

func addPadding(s string) string {
    switch len(s) % 4 {
    case 1:
        return s + "==="
    case 2:
        return s + "=="
    case 3:
        return s + "="
    default:
        return s
    }
}