Struct serde_with::base64::Base64

use serde_with::base64::{Base64, Bcrypt, BinHex, Standard};
use serde_with::formats::{Padded, Unpadded};

#[serde_as]
#[derive(Serialize, Deserialize)]
struct B64 {
    // The default is the same as Standard character set with padding
    #[serde_as(as = "Base64")]
    default: Vec<u8>,
    // Only change the character set, implies padding
    #[serde_as(as = "Base64<BinHex>")]
    charset_binhex: Vec<u8>,

    #[serde_as(as = "Base64<Standard, Padded>")]
    explicit_padding: Vec<u8>,
    #[serde_as(as = "Base64<Bcrypt, Unpadded>")]
    no_padding: Vec<u8>,
}

let b64 = B64 {
    default: b"Hello World".to_vec(),
    charset_binhex: b"Hello World".to_vec(),
    explicit_padding: b"Hello World".to_vec(),
    no_padding: b"Hello World".to_vec(),
};
let json = serde_json::json!({
    "default": "SGVsbG8gV29ybGQ=",
    "charset_binhex": "5'8VD'mI8epaD'3=",
    "explicit_padding": "SGVsbG8gV29ybGQ=",
    "no_padding": "QETqZE6eT07wZEO",
});

// Test serialization and deserialization
assert_eq!(json, serde_json::to_value(&b64).unwrap());
assert_eq!(b64, serde_json::from_value(json).unwrap());