@polkadot/util-crypto
Version:
A collection of useful crypto utilities for @polkadot
56 lines (55 loc) • 1.87 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.createValidate = exports.createIs = exports.createEncode = exports.createDecode = void 0;
const util_1 = require("@polkadot/util");
/** @internal */
function createDecode({ coder, ipfs }, validate) {
return (value, ipfsCompat) => {
validate(value, ipfsCompat);
return coder.decode(ipfs && ipfsCompat
? value.substring(1)
: value);
};
}
exports.createDecode = createDecode;
/** @internal */
function createEncode({ coder, ipfs }) {
return (value, ipfsCompat) => {
const out = coder.encode((0, util_1.u8aToU8a)(value));
return ipfs && ipfsCompat
? `${ipfs}${out}`
: out;
};
}
exports.createEncode = createEncode;
/** @internal */
function createIs(validate) {
return (value, ipfsCompat) => {
try {
return validate(value, ipfsCompat);
}
catch {
return false;
}
};
}
exports.createIs = createIs;
/** @internal */
function createValidate({ chars, ipfs, type }) {
return (value, ipfsCompat) => {
if (typeof value !== 'string') {
throw new Error(`Expected ${type} string input`);
}
else if (ipfs && ipfsCompat && value[0] !== ipfs) {
throw new Error(`Expected ipfs-compatible ${type} to start with '${ipfs}'`);
}
for (let i = (ipfsCompat ? 1 : 0), count = value.length; i < count; i++) {
if (!(chars.includes(value[i]) || (value[i] === '=' && ((i === value.length - 1) ||
!chars.includes(value[i + 1]))))) {
throw new Error(`Invalid ${type} character "${value[i]}" (0x${value.charCodeAt(i).toString(16)}) at index ${i}`);
}
}
return true;
};
}
exports.createValidate = createValidate;