feat: add util.cid options (#13)

* feat: add util.cid options

See ipld/interface-ipld-format#40

package.json

@@ -38,11 +38,13 @@
   },
   "homepage": "https://github.com/ipld/js-ipld-raw#readme",
   "dependencies": {
-    "cids": "~0.5.2"
+    "cids": "~0.5.2",
+    "multihashing-async": "~0.5.1"
   },
   "devDependencies": {
     "aegir": "^12.4.0",
     "chai": "^4.1.2",
-    "dirty-chai": "^2.0.1"
+    "dirty-chai": "^2.0.1",
+    "multihashes": "~0.4.12"
   }
 }

src/index.js

@@ -1,5 +1,6 @@
 'use strict'
 const CID = require('cids')
+const multihash = require('multihashing-async')
 
 // binary resolver
 module.exports = {
@@ -26,8 +27,18 @@ module.exports = {
     serialize: (data, cb) => {
       cb(null, data)
     },
-    cid: (data, cb) => {
-      cb(null, new CID(1, 'raw', data))
+    cid: (data, options, cb) => {
+      if (typeof options === 'function') {
+        cb = options
+        options = {}
+      }
+      options = options || {}
+      const hashAlg = options.hashAlg || 'sha2-256'
+      const version = typeof options.version === 'undefined' ? 1 : options.version
+      multihash(data, hashAlg, (err, mh) => {
+        if (err) return cb(err)
+        cb(null, new CID(version, 'raw', mh))
+      })
     }
   }
 }

test/index.spec.js

@@ -7,6 +7,7 @@ chai.use(dirtyChai)
 
 const ipldRaw = require('../src/index')
 const resolver = ipldRaw.resolver
+const multihash = require('multihashes')
 
 describe('raw codec', () => {
   let testData = Buffer.from('test data')
@@ -52,3 +53,47 @@ describe('raw codec', () => {
     })
   })
 })
+
+describe('raw util', () => {
+  let rawData = Buffer.from('some raw data')
+
+  it('serialize is noop', (done) => {
+    ipldRaw.util.serialize(rawData, (err, result) => {
+      expect(err).to.not.exist()
+      expect(result).to.equal(rawData)
+      done()
+    })
+  })
+
+  it('deserialize is noop', (done) => {
+    ipldRaw.util.deserialize(rawData, (err, result) => {
+      expect(err).to.not.exist()
+      expect(result).to.equal(rawData)
+      done()
+    })
+  })
+
+  it('create cid', (done) => {
+    ipldRaw.util.cid(rawData, (err, cid) => {
+      expect(err).to.not.exist()
+      expect(cid.version).to.equal(1)
+      expect(cid.codec).to.equal('raw')
+      expect(cid.multihash).to.exist()
+      const mh = multihash.decode(cid.multihash)
+      expect(mh.name).to.equal('sha2-256')
+      done()
+    })
+  })
+
+  it('create cid with hashAlg', (done) => {
+    ipldRaw.util.cid(rawData, { hashAlg: 'sha2-512' }, (err, cid) => {
+      expect(err).to.not.exist()
+      expect(cid.version).to.equal(1)
+      expect(cid.codec).to.equal('raw')
+      expect(cid.multihash).to.exist()
+      const mh = multihash.decode(cid.multihash)
+      expect(mh.name).to.equal('sha2-512')
+      done()
+    })
+  })
+})