/**
* @module AccountName
*/
import * as bs58 from 'bs58';
import * as Long from 'long';
const { PublicKey } = require('./ecc');
/**
Hashes a public key to a valid FIOIO account name.
@arg {string} pubkey
@return {string} valid FIOIO account name
*/
export function accountHash(pubkey : string) : string {
if(!PublicKey.isValid(pubkey, 'EOS')) {
throw new TypeError('invalid public key');
}
pubkey = pubkey.substring('EOS'.length, pubkey.length);
const decoded58 = bs58.decode(pubkey);
const long = shortenKey(decoded58);
const output = stringFromUInt64T(long);
return output;
}
function shortenKey(key : [number]) : any {
var res = Long.fromValue (0, true);
var temp = Long.fromValue (0, true);
var toShift = 0;
var i = 1;
var len = 0;
while (len <= 12) {
//assert(i < 33, "Means the key has > 20 bytes with trailing zeroes...")
temp = Long.fromValue(key[i], true).and(len == 12 ? 0x0f : 0x1f);
if (temp == 0) {
i+=1
continue
}
if (len == 12){
toShift = 0;
}
else{
toShift = (5 * (12 - len) - 1);
}
temp = Long.fromValue(temp, true).shiftLeft(toShift);
res = Long.fromValue(res, true).or(temp);
len+=1
i+=1
}
return res;
}
function stringFromUInt64T(temp : any) : string{
var charmap = ".12345abcdefghijklmnopqrstuvwxyz".split('');
var str = new Array(13);
str[12] = charmap[Long.fromValue(temp, true).and(0x0f)];
temp = Long.fromValue(temp, true).shiftRight(4);
for (var i = 1; i <= 12; i++) {
var c = charmap[Long.fromValue(temp, true).and(0x1f)];
str[12 - i] = c;
temp = Long.fromValue(temp, true).shiftRight(5);
}
var result = str.join('');
if (result.length > 12) {
result = result.substring(0, 12);
}
return result;
}
测试
describe('accountname', () => {
it('matches', () => {
const samplekey = "EOS7isxEua78KPVbGzKemH4nj2bWE52gqj8Hkac3tc7jKNvpfWzYS";
const accountHash = AccountName.accountHash(samplekey);
expect(accountHash).toEqual('p4hc54ppiofx');
})
})
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