fix(aens): validate minus chars in name as aenode does

src/tx/builder/helpers.ts

@@ -70,6 +70,15 @@ export function nameToPunycode(maybeName: string): AensName {
   if (/\p{Emoji_Presentation}/u.test(name)) {
     throw new ArgumentError('aens name', 'not containing emoji', maybeName);
   }
+  if (name[2] === '-' && name[3] === '-') {
+    throw new ArgumentError('aens name', 'without "-" char in both the third and fourth positions', maybeName);
+  }
+  if (name[0] === '-') {
+    throw new ArgumentError('aens name', 'starting with no "-" char', maybeName);
+  }
+  if (name.at(-1) === '-') {
+    throw new ArgumentError('aens name', 'ending with no "-" char', maybeName);
+  }
   let punycode;
   try {
     const u = new URL(`http://${name}.${suffix}`);

test/unit/aens.ts

@@ -295,6 +295,18 @@ describe('AENS utils', () => {
       expect(() => ensureName('ldiDxa1Yxy1iiTRztYEN4F8nrnfZib3Q1MllPghmst8fjJ1sI3DXzOoAddE2ETxp.chain'))
         .to.throw(ArgumentError, 'aens name should be not too long, got ldiDxa1Yxy1iiTRztYEN4F8nrnfZib3Q1MllPghmst8fjJ1sI3DXzOoAddE2ETxp.chain instead');
     });
+
+    it('fails if name starts or ends with minus', () => {
+      expect(() => ensureName('-test.chain'))
+        .to.throw(ArgumentError, 'aens name should be starting with no "-" char, got -test.chain instead');
+      expect(() => ensureName('test-.chain'))
+        .to.throw(ArgumentError, 'aens name should be ending with no "-" char, got test-.chain instead');
+    });
+
+    it('fails if name has minus at 2, 3 chars', () => {
+      expect(() => ensureName('te--st.chain'))
+        .to.throw(ArgumentError, 'aens name should be without "-" char in both the third and fourth positions, got te--st.chain instead');
+    });
   });
 
   describe('isAuctionName', () => {