feat: add support to ipns resolve /ipns/<fqdn>

fixes: #1918

package.json

@@ -113,6 +113,7 @@
     "ipns": "~0.5.2",
     "is-domain-name": "^1.0.1",
     "is-ipfs": "~0.6.1",
+    "is-domain-name": "^1.0.1",
     "is-pull-stream": "~0.0.0",
     "is-stream": "^2.0.0",
     "iso-url": "~0.4.6",

test/core/name.spec.js

@@ -500,4 +500,43 @@ describe('name', function () {
       done()
     })
   })
+
+  describe('working with dns', function () {
+    let node
+    let ipfsd
+
+    before(function (done) {
+      df.spawn({
+        exec: IPFS,
+        args: [`--pass ${hat()}`, '--offline'],
+        config: { Bootstrap: [] }
+      }, (err, _ipfsd) => {
+        expect(err).to.not.exist()
+        ipfsd = _ipfsd
+        node = _ipfsd.api
+        done()
+      })
+    })
+
+    after((done) => ipfsd.stop(done))
+
+    it('should resolve ipfs.io', async () => {
+      const r = await node.name.resolve('ipfs.io', { recursive: false })
+      return expect(r).to.eq('/ipns/website.ipfs.io')
+    })
+
+    it('should resolve /ipns/ipfs.io recursive', async () => {
+      const r = await node.name.resolve('ipfs.io', { recursive: true })
+
+      return expect(r.substr(0, 6)).to.eql('/ipfs/')
+    })
+
+    it('should fail to resolve /ipns/ipfs.a', async () => {
+      try {
+        await node.name.resolve('ipfs.a')
+      } catch (err) {
+        expect(err).to.exist()
+      }
+    })
+  })
 })