fix: ensure empty link names are preserved

src/dag-node/create.js

@@ -33,9 +33,10 @@ function create (data, dagLinks, hashAlg, callback) {
     }
 
     return new DAGLink(
-      l.name || l.Name,
-      l.size || l.Size,
-      l.hash || l.Hash || l.multihash)
+      l.name != null ? l.name : l.Name,
+      l.size != null ? l.size : l.Size,
+      l.hash || l.Hash || l.multihash
+    )
   })
 
   sortInplace(links, linkSort)

test/dag-link-test.js

@@ -15,6 +15,11 @@ module.exports = (repo) => {
           .to.equal('12208ab7a6c5e74737878ac73863cb76739d15d4666de44e5756bf55a2f9e9ab5f43')
       })
 
+      it('empty string', () => {
+        const link = new DAGLink('', 4, 'QmXg9Pp2ytZ14xgmQjYEiHjVjMFXzCVVEcRTWJBmLgR39U')
+        expect(link.name).to.be.eql('')
+      })
+
       it('create with multihash as a multihash Buffer', () => {
         const link = new DAGLink('hello', 3, new Buffer('12208ab7a6c5e74737878ac73863cb76739d15d4666de44e5756bf55a2f9e9ab5f43', 'hex'))
 

test/dag-node-test.js

@@ -85,6 +85,16 @@ module.exports = (repo) => {
       })
     })
 
+    it('create with empty link name', (done) => {
+      DAGNode.create(new Buffer('hello'), [
+        new DAGLink('', 10, 'QmXg9Pp2ytZ14xgmQjYEiHjVjMFXzCVVEcRTWJBmLgR39U')
+      ], (err, node) => {
+        expect(err).to.not.exist
+        expect(node.links[0].name).to.be.eql('')
+        done()
+      })
+    })
+
     it('create an empty node', (done) => {
       expect(7).checks(done)
       const fromGoIPFS = 'QmdfTbBqBPQ7VNxZEYEj14VmRuZBkqFbiwReogJgS1zR1n'
@@ -134,7 +144,7 @@ module.exports = (repo) => {
               .to.eql(node2.multihash)
             expect(node1b.links[0].size)
               .to.eql(node2.size)
-            expect(node1b.links[0].name).to.not.exist
+            expect(node1b.links[0].name).to.be.eql('')
             cb()
           })
         }
@@ -170,7 +180,7 @@ module.exports = (repo) => {
               .to.eql(node2.multihash)
             expect(node1b.links[0].size)
               .to.eql(node2.size)
-            expect(node1b.links[0].name).to.not.exist
+            expect(node1b.links[0].name).to.be.eql('')
             cb()
           })
         }
@@ -206,7 +216,7 @@ module.exports = (repo) => {
               .to.eql(node2.multihash)
             expect(node1b.links[0].size)
               .to.eql(node2.size)
-            expect(node1b.links[0].name).to.not.exist
+            expect(node1b.links[0].name).to.be.eql('')
             cb()
           })
         }

test/resolver.spec.js

@@ -17,7 +17,7 @@ describe('IPLD Format resolver (local)', () => {
   let dataLinksNodeBlock
 
   const links = [{
-    name: undefined,
+    name: '',
     multihash: 'QmXg9Pp2ytZ14xgmQjYEiHjVjMFXzCVVEcRTWJBmLgR39U',
     size: 10
   }, {