tornado-packages/ethers.js
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Relax ENS normalize for double-hyphen to only throw on punycode conflicts (#42, #2376, #2754).

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This commit is contained in:
Richard Moore 2022-08-16 17:00:34 -04:00
parent d9897e0fdb
commit fce9aaa734
1 changed files with 11 additions and 7 deletions
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18
packages/hash/src.ts/namehash.ts
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@ -14,7 +14,7 @@ Zeros.fill(0);
function checkComponent(comp: Uint8Array): Uint8Array {
if (comp.length === 0) { throw new Error("invalid ENS name; empty component"); }
let nonUnder = false;
let last = -1;
let allAscii = true;
for (let i = 0; i < comp.length; i++) {
const c = comp[i];
@ -22,14 +22,19 @@ function checkComponent(comp: Uint8Array): Uint8Array {
if (c === 0x5f) {
if (nonUnder) { throw new Error("invalid ENS name; non-prefix underscore"); }
} else {
// A hyphen (i.e. "-"); only allows a single in a row
if (c === 0x2d && last === c) {
throw new Error("invalid ENS name; double-hyphen");
}
// Non-ASCII byte
if (c & 0x80) { allAscii = false; }
// Non-underscore found
nonUnder = true;
}
last = c;
}
// Prevent punycode-looking components
if (allAscii && comp[2] === 0x2d && comp[3] === 0x2d) {
throw new Error("invalid ENS name; punycode conflict");
}
return comp;
}
@ -98,4 +103,3 @@ export function dnsEncode(name: string): string {
}))) + "00";
}