fix: replace node buffers with uint8arrays (#69)

Follow up to #66 that removes node Buffers from the tests and uses
version of protons that returns uint8arrays.

BREAKING CHANGES:

- All use of node Buffers have been replaced with Uint8Arrays
- CIDs exported by this module have breaking API changes, see: multiformats/js-cid#117

packages/ipfs-unixfs-exporter/package.json

@@ -37,29 +37,26 @@
   "devDependencies": {
     "abort-controller": "^3.0.0",
     "aegir": "^25.0.0",
-    "buffer": "^5.6.0",
-    "chai": "^4.2.0",
-    "chai-as-promised": "^7.1.1",
     "detect-node": "^2.0.4",
-    "dirty-chai": "^2.0.1",
     "ipfs-unixfs-importer": "^3.0.1",
-    "ipld": "^0.26.1",
-    "ipld-dag-pb": "^0.19.0",
-    "ipld-in-memory": "^5.0.0",
+    "ipld": "^0.27.0",
+    "ipld-dag-pb": "^0.20.0",
+    "ipld-in-memory": "^6.0.0",
     "it-all": "^1.0.1",
     "it-buffer-stream": "^1.0.2",
     "it-first": "^1.0.1",
-    "multicodec": "^1.0.0",
+    "multicodec": "^2.0.0",
     "nyc": "^15.0.0",
-    "sinon": "^9.0.1"
+    "sinon": "^9.0.1",
+    "uint8arrays": "^1.0.0"
   },
   "dependencies": {
-    "cids": "^0.8.0",
+    "cids": "^1.0.0",
     "err-code": "^2.0.0",
     "hamt-sharding": "^1.0.0",
     "ipfs-unixfs": "^2.0.1",
     "ipfs-utils": "^2.3.1",
     "it-last": "^1.0.1",
-    "multihashing-async": "^1.0.0"
+    "multihashing-async": "^2.0.0"
   }
 }

packages/ipfs-unixfs-exporter/src/utils/find-cid-in-shard.js

@@ -2,12 +2,11 @@
 
 const Bucket = require('hamt-sharding/src/bucket')
 const multihashing = require('multihashing-async')
-const TextEncoder = require('ipfs-utils/src/text-encoder')
-const UTF8_ENCODER = new TextEncoder('utf8')
+const uint8ArrayFromString = require('uint8arrays/from-string')
 
 // FIXME: this is copy/pasted from ipfs-unixfs-importer/src/dir-sharded.js
 const hashFn = async function (value) {
-  const buf = UTF8_ENCODER.encode(value)
+  const buf = uint8ArrayFromString(value)
   const hash = await multihashing(buf, 'murmur3-128')
 
   // Multihashing inserts preamble of 2 bytes. Remove it.

packages/ipfs-unixfs-exporter/test/exporter-sharded.spec.js

@@ -1,10 +1,7 @@
 /* eslint-env mocha */
 'use strict'
 
-const { Buffer } = require('buffer')
-const chai = require('chai')
-chai.use(require('dirty-chai'))
-const expect = chai.expect
+const { expect } = require('aegir/utils/chai')
 const IPLD = require('ipld')
 const inMemory = require('ipld-in-memory')
 const UnixFS = require('ipfs-unixfs')
@@ -20,6 +17,7 @@ const {
   DAGNode
 } = require('ipld-dag-pb')
 const blockApi = require('./helpers/block')
+const uint8ArrayConcat = require('uint8arrays/concat')
 
 const SHARD_SPLIT_THRESHOLD = 10
 
@@ -36,7 +34,7 @@ describe('exporter sharded', function () {
   const createShardWithFileNames = (numFiles, fileName) => {
     const files = new Array(numFiles).fill(0).map((_, index) => ({
       path: fileName(index),
-      content: Buffer.from([0, 1, 2, 3, 4, index])
+      content: Uint8Array.from([0, 1, 2, 3, 4, index])
     }))
 
     return createShardWithFiles(files)
@@ -59,7 +57,7 @@ describe('exporter sharded', function () {
 
     for (let i = 0; i < (SHARD_SPLIT_THRESHOLD + 1); i++) {
       files[`file-${Math.random()}.txt`] = {
-        content: Buffer.concat(await all(randomBytes(100)))
+        content: uint8ArrayConcat(await all(randomBytes(100)))
       }
     }
 
@@ -92,7 +90,7 @@ describe('exporter sharded', function () {
 
     for (let i = 0; i < dirFiles.length; i++) {
       const dirFile = dirFiles[i]
-      const data = Buffer.concat(await all(dirFile.content()))
+      const data = uint8ArrayConcat(await all(dirFile.content()))
 
       // validate the CID
       expect(files[dirFile.name].cid.equals(dirFile.cid)).to.be.true()

packages/ipfs-unixfs-exporter/test/exporter-subtree.spec.js

@@ -1,10 +1,7 @@
 /* eslint-env mocha */
 'use strict'
 
-const { Buffer } = require('buffer')
-const chai = require('chai')
-chai.use(require('dirty-chai'))
-const expect = chai.expect
+const { expect } = require('aegir/utils/chai')
 const IPLD = require('ipld')
 const inMemory = require('ipld-in-memory')
 const importer = require('ipfs-unixfs-importer')
@@ -13,6 +10,7 @@ const all = require('it-all')
 const last = require('it-last')
 const blockApi = require('./helpers/block')
 const randomBytes = require('it-buffer-stream')
+const uint8ArrayConcat = require('uint8arrays/concat')
 
 const ONE_MEG = Math.pow(1024, 2)
 
@@ -28,7 +26,7 @@ describe('exporter subtree', () => {
   })
 
   it('exports a file 2 levels down', async () => {
-    const content = Buffer.concat(await all(randomBytes(ONE_MEG)))
+    const content = uint8ArrayConcat(await all(randomBytes(ONE_MEG)))
 
     const imported = await last(importer([{
       path: './200Bytes.txt',
@@ -44,12 +42,12 @@ describe('exporter subtree', () => {
     expect(exported.name).to.equal('200Bytes.txt')
     expect(exported.path).to.equal(`${imported.cid.toBaseEncodedString()}/level-1/200Bytes.txt`)
 
-    const data = Buffer.concat(await all(exported.content()))
+    const data = uint8ArrayConcat(await all(exported.content()))
     expect(data).to.deep.equal(content)
   })
 
   it('exports a directory 1 level down', async () => {
-    const content = Buffer.concat(await all(randomBytes(ONE_MEG)))
+    const content = uint8ArrayConcat(await all(randomBytes(ONE_MEG)))
     const imported = await last(importer([{
       path: './200Bytes.txt',
       content: randomBytes(ONE_MEG)
@@ -70,7 +68,7 @@ describe('exporter subtree', () => {
     expect(files[1].name).to.equal('level-2')
     expect(files[1].path).to.equal(`${imported.cid.toBaseEncodedString()}/level-1/level-2`)
 
-    const data = Buffer.concat(await all(files[0].content()))
+    const data = uint8ArrayConcat(await all(files[0].content()))
     expect(data).to.deep.equal(content)
   })
 
@@ -88,7 +86,7 @@ describe('exporter subtree', () => {
   })
 
   it('exports starting from non-protobuf node', async () => {
-    const content = Buffer.concat(await all(randomBytes(ONE_MEG)))
+    const content = uint8ArrayConcat(await all(randomBytes(ONE_MEG)))
 
     const imported = await last(importer([{
       path: './level-1/200Bytes.txt',
@@ -108,12 +106,12 @@ describe('exporter subtree', () => {
     expect(exported.name).to.equal('200Bytes.txt')
     expect(exported.path).to.equal(`${cborNodeCid.toBaseEncodedString()}/a/file/level-1/200Bytes.txt`)
 
-    const data = Buffer.concat(await all(exported.content()))
+    const data = uint8ArrayConcat(await all(exported.content()))
     expect(data).to.deep.equal(content)
   })
 
   it('uses .path to export all components of a path', async () => {
-    const content = Buffer.concat(await all(randomBytes(ONE_MEG)))
+    const content = uint8ArrayConcat(await all(randomBytes(ONE_MEG)))
 
     const imported = await last(importer([{
       path: './200Bytes.txt',