fix: do not ignore cid.options (#18)

src/util.js

@@ -78,7 +78,9 @@ exports.deserialize = (data, callback) => {
  * Get the CID of the DAG-Node.
  *
  * @param {Object} dagNode - Internal representation
- * @param {Object} [options] - Ignored
+ * @param {Object} [options] - Options to create the CID
+ * @param {number} [options.version=1] - CID version number
+ * @param {string} [options.hashAlg='sha1'] - Hashing algorithm
  * @param {CidCallback} callback - Callback that handles the return value
  * @returns {void}
  */
@@ -88,9 +90,11 @@ exports.cid = (dagNode, options, callback) => {
     options = {}
   }
   options = options || {}
+  const hashAlg = options.hashAlg || resolver.defaultHashAlg
+  const version = typeof options.version === 'undefined' ? 1 : options.version
   waterfall([
     (cb) => exports.serialize(dagNode, cb),
-    (serialized, cb) => multihashing(serialized, resolver.defaultHashAlg, cb),
-    (mh, cb) => cb(null, new CID(1, resolver.multicodec, mh))
+    (serialized, cb) => multihashing(serialized, hashAlg, cb),
+    (mh, cb) => cb(null, new CID(version, resolver.multicodec, mh))
   ], callback)
 }

test/util.spec.js

@@ -47,14 +47,21 @@ describe('IPLD format util', () => {
     })
   })
 
-  it('.cid ignores options', (done) => {
-    ipldGit.util.cid(tagNode, { hashAlg: 'unknown' }, (err, cid) => {
+  it('.cid with options', (done) => {
+    ipldGit.util.cid(tagNode, { hashAlg: 'sha3-512' }, (err, cid) => {
       expect(err).to.not.exist()
       expect(cid.version).to.equal(1)
       expect(cid.codec).to.equal('git-raw')
       expect(cid.multihash).to.exist()
       const mh = multihash.decode(cid.multihash)
-      expect(mh.name).to.equal('sha1')
+      expect(mh.name).to.equal('sha3-512')
+      done()
+    })
+  })
+
+  it('.cid errors unknown hashAlg', (done) => {
+    ipldGit.util.cid(tagNode, { hashAlg: 'unknown' }, (err, cid) => {
+      expect(err).to.exist()
       done()
     })
   })