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use crate::base::curve::sha256::JSha256;
use crate::base::xcodec::util::{is_set, concat_args, seq_equal};
use crate::base::data::base_data::{BaseDataI};
use basex_rs::{BaseX, SKYWELL, Decode, Encode};
use cast_rs::hex;
pub trait XCodeI {
fn encode(bytes: &mut Vec<u8>, arg: Box<dyn BaseDataI>) -> String;
fn decode(string: &String, opts: Box<dyn BaseDataI>) -> Option<Vec<u8>>;
fn encode_raw(bytes: &mut Vec<u8>) -> String ;
fn decode_raw(string: String) -> Option<Vec<u8>>;
fn encode_checked(buffer: &mut Vec<u8>) -> String;
fn decode_checked(encoded: String) -> Option<Vec<u8>>;
fn encode_versioned(bytes: &mut Vec<u8>, arg: Box<dyn BaseDataI>) -> String;
fn decode_versioned(string: String, arg: Box<dyn BaseDataI>) -> Option<Vec<u8>>;
fn decode_multi_versioned(encoded: &String, arg: Box<dyn BaseDataI>) -> Option<Vec<u8>> ;
fn verify_checksum(bytes: &Vec<u8>) -> bool;
// fn find_prefix();
}
pub struct CodecFactory {}
impl CodecFactory {
pub fn new() -> Self {
// this.alphabet = alphabet;
// this.codec = baseCodec(alphabet);
// alphabet_len = alphabet.length;
CodecFactory {
}
}
}
impl XCodeI for CodecFactory {
fn encode(bytes: &mut Vec<u8>, arg: Box<dyn BaseDataI>) -> String {
let version = arg.get_version();
if is_set(&version) {
return CodecFactory::encode_versioned(bytes, arg);
} else {
if arg.get_checked().is_some() {
return CodecFactory::encode_checked(bytes);
} else {
return CodecFactory::encode_raw(bytes);
}
}
}
fn decode(string: &String, opts: Box<dyn BaseDataI>) -> Option<Vec<u8>> {
let versions = opts.get_versions();
if versions.is_some() {
return CodecFactory::decode_multi_versioned(string, opts);//opts.get_expected_length(), opts.get_version_type());
} else {
let version = opts.get_version();
if version.is_some() {
return CodecFactory::decode_versioned(string.to_string(), opts);
} else {
let checked = opts.get_checked();
if checked.is_some() {
return CodecFactory::decode_checked(string.to_string());
} else {
return CodecFactory::decode_raw(string.to_string());
}
}
}
}
fn encode_raw(bytes: &mut Vec<u8>) -> String {
BaseX::new(SKYWELL).encode(bytes.as_mut_slice())
}
fn decode_raw(string: String) -> Option<Vec<u8>> {
BaseX::new(SKYWELL).decode(string)
}
fn encode_checked(buffer: &mut Vec<u8>) -> String {
// var check = sha256(sha256(buffer)).slice(0, 4);
let check: Vec<u8> = JSha256::sha256(&buffer);
//6. take 0..4
let token = check.get(..4).unwrap().to_vec();
concat_args(buffer, &token);
CodecFactory::encode_raw(buffer)
}
fn decode_checked(encoded: String) -> Option<Vec<u8>> {
let bytes = CodecFactory::decode_raw(encoded).unwrap();
if bytes.len() < 5 {
panic!("invalid_input_size");
}
if CodecFactory::verify_checksum(&bytes) {
panic!("checksum_invalid");
}
// buf.slice(0, -4)
Some(bytes[0..bytes.len()-4].to_vec())
}
fn encode_versioned(bytes: &mut Vec<u8>, arg: Box<dyn BaseDataI>) -> String {
let expected_length = arg.get_expected_length().unwrap();
let version = arg.get_version().unwrap();
if expected_length == 0 && bytes.len() != expected_length {
panic!("unexpected_payload_length");
}
concat_args( bytes, &hex::decode(version).unwrap());
CodecFactory::encode_checked(bytes)
}
fn decode_versioned(string: String, arg: Box<dyn BaseDataI>) -> Option<Vec<u8>> {
CodecFactory::decode_multi_versioned(&string, arg)
}
//
fn decode_multi_versioned(_encoded: &String, _arg: Box<dyn BaseDataI>) -> Option<Vec<u8>> {
None
// let without_sum = CodecFactory::decodeChecked(encoded);
//
// let expected_length = arg.get_expected_length().unwrap();
//
// var ret = { version: null, bytes: null };
//
// if possible_versions.len() > 1 && expected_length == 0 {
// panic!("must pass expectedLengthgth > 1 possibleVersions");
// }
//
// let versionlen_guess = possible_versions[0].len() || 1; // Number.length
// let payload_length = arg.get_expected_length() || without_sum.len() - versionlen_guess;
// let version_bytes = without_sum.slice(0, -payload_length);
// let payload = without_sum.slice(-payload_length);
//
// var foundVersion = possibleVersions.some(function (version, i) {
// var asArray = Array.isArray(version) ? version : [version];
// if (seqEqual(versionBytes, asArray)) {
// ret.version = version;
// ret.bytes = payload;
// if (types) {
// ret.type = types[i];
// }
// return true;
// }
// });
//
// if ! found_version {
// panic!("version_invalid");
// }
//
// if expected_length == 0 && ret.bytes.length !== expected_length) {
// panic!("unexpected_payload_length");
// }
//
// return ret;
}
fn verify_checksum(bytes: &Vec<u8>) -> bool {
// let computed = sha256(sha256(bytes.slice(0, -4))).slice(0, 4);
// let checksum = bytes.slice(0..-4);
let computed = JSha256::sha256(&bytes[0..bytes.len()-4].to_vec()).get(..4).unwrap().to_vec();
let checksum = bytes[0..bytes.len()-4].to_vec();
seq_equal(&computed, &checksum)
}
// fn find_prefix(&self, desired_prefix: &str, payload_length: usize) {
// if (this.base !== 58) {
// panic!("Only works for base58");
// }
//
// let total_length = payload_length + 4;
// let chars = Math.log(Math.pow(256, total_length)) / Math.log(this.base);
//
// let requiredChars = Math.ceil(chars + 0.2);
// let padding = this.alphabet[Math.floor(this.alphabet.length / 2) - 1];
// let template = desiredPrefix + new Array(requiredChars + 1).join(padding);
// let bytes = this.decodeRaw(template);
// let version = bytes.slice(0, -totalLength);
//
// return version;
// }
}