fix: support uint8arrays in place of node buffers (#23)

BREAKING CHANGE: takes Uint8Arrays as well as Node Buffers

Author: achingbrain

package.json

@@ -37,18 +37,19 @@
   },
   "homepage": "https://github.com/libp2p/js-libp2p-record",
   "devDependencies": {
-    "aegir": "^22.0.0",
+    "aegir": "^25.0.0",
     "chai": "^4.2.0",
     "dirty-chai": "^2.0.1",
+    "ipfs-utils": "^2.3.1",
     "libp2p-crypto": "~0.17.0",
+    "multibase": "^2.0.0",
     "peer-id": "~0.13.6"
   },
   "dependencies": {
-    "buffer": "^5.6.0",
     "err-code": "^2.0.0",
-    "multihashes": "~0.4.15",
-    "multihashing-async": "^0.8.0",
-    "protons": "^1.0.1"
+    "multihashes": "^1.0.1",
+    "multihashing-async": "^1.0.0",
+    "protons": "^1.2.1"
   },
   "contributors": [
     "Vasco Santos <vasco.santos@moxy.studio>",

src/record.js

@@ -1,23 +1,22 @@
 'use strict'
 
 const protons = require('protons')
-const { Buffer } = require('buffer')
 const pb = protons(require('./record.proto')).Record
 const utils = require('./utils')
 
 class Record {
   /**
-   * @param {Buffer} [key]
-   * @param {Buffer} [value]
+   * @param {Uint8Array} [key]
+   * @param {Uint8Array} [value]
    * @param {Date} [recvtime]
    */
   constructor (key, value, recvtime) {
-    if (key && !Buffer.isBuffer(key)) {
-      throw new Error('key must be a Buffer')
+    if (!(key instanceof Uint8Array)) {
+      throw new Error('key must be a Uint8Array')
     }
 
-    if (value && !Buffer.isBuffer(value)) {
-      throw new Error('value must be a buffer')
+    if (!(value instanceof Uint8Array)) {
+      throw new Error('value must be a Uint8Array')
     }
 
     this.key = key
@@ -26,7 +25,7 @@ class Record {
   }
 
   /**
-   * @returns {Buffer}
+   * @returns {Uint8Array}
    */
   serialize () {
     return pb.encode(this.prepareSerialize())
@@ -48,7 +47,7 @@ class Record {
   /**
    * Decode a protobuf encoded record.
    *
-   * @param {Buffer} raw
+   * @param {Uint8Array} raw
    * @returns {Record}
    */
   static deserialize (raw) {

src/selection.js

@@ -1,12 +1,14 @@
 'use strict'
 
 const errcode = require('err-code')
+const { utf8Decoder } = require('./utils')
+
 /**
  * Select the best record out of the given records.
  *
  * @param {Object} selectors
- * @param {Buffer} k
- * @param {Array<Buffer>} records
+ * @param {Uint8Array} k
+ * @param {Array<Uint8Array>} records
  * @returns {number} - The index of the best record.
  */
 const bestRecord = (selectors, k, records) => {
@@ -16,7 +18,8 @@ const bestRecord = (selectors, k, records) => {
     throw errcode(new Error(errMsg), 'ERR_NO_RECORDS_RECEIVED')
   }
 
-  const parts = k.toString().split('/')
+  const kStr = utf8Decoder.decode(k)
+  const parts = kStr.split('/')
 
   if (parts.length < 3) {
     const errMsg = 'Record key does not have a selector function'

src/selectors/public-key.js

@@ -5,8 +5,8 @@
  * Simply returns the first record, as all valid public key
  * records are equal.
  *
- * @param {Buffer} k
- * @param {Array<Buffer>} records
+ * @param {Uint8Array} k
+ * @param {Array<Uint8Array>} records
  * @returns {number}
  */
 const publicKeySelector = (k, records) => {

src/utils.js

@@ -1,5 +1,10 @@
 'use strict'
 
+const TextDecoder = require('ipfs-utils/src/text-decoder')
+const utf8Decoder = new TextDecoder('utf8')
+
+module.exports.utf8Decoder = utf8Decoder
+
 /**
  * Convert a JavaScript date into an `RFC3339Nano` formatted
  * string.
@@ -52,3 +57,21 @@ module.exports.parseRFC3339 = (time) => {
 
   return new Date(Date.UTC(year, month, date, hour, minute, second, millisecond))
 }
+
+module.exports.uint8ArraysEqual = (arr1, arr2) => {
+  if (arr1 === arr2) {
+    return true
+  }
+
+  if (arr1.byteLength !== arr2.byteLength) {
+    return false
+  }
+
+  for (let i = 0; i < arr1.byteLength; i++) {
+    if (arr1[i] !== arr2[i]) {
+      return false
+    }
+  }
+
+  return true
+}

src/validator.js

@@ -1,6 +1,7 @@
 'use strict'
 
 const errcode = require('err-code')
+const { utf8Decoder } = require('./utils')
 /**
  * Checks a record and ensures it is still valid.
  * It runs the needed validators.
@@ -12,7 +13,8 @@ const errcode = require('err-code')
  */
 const verifyRecord = (validators, record) => {
   const key = record.key
-  const parts = key.toString().split('/')
+  const keyString = utf8Decoder.decode(key)
+  const parts = keyString.split('/')
 
   if (parts.length < 3) {
     // No validator available

src/validators/public-key.js

@@ -2,27 +2,28 @@
 
 const multihashing = require('multihashing-async')
 const errcode = require('err-code')
-const { Buffer } = require('buffer')
+const { utf8Decoder, uint8ArraysEqual } = require('../utils')
+
 /**
- * Validator for publick key records.
+ * Validator for public key records.
  * Verifies that the passed in record value is the PublicKey
  * that matches the passed in key.
  * If validation fails the returned Promise will reject with the error.
  *
- * @param {Buffer} key - A valid key is of the form `'/pk/<keymultihash>'`
- * @param {Buffer} publicKey - The public key to validate against (protobuf encoded).
+ * @param {Uint8Array} key - A valid key is of the form `'/pk/<keymultihash>'`
+ * @param {Uint8Array} publicKey - The public key to validate against (protobuf encoded).
  * @returns {Promise}
  */
 const validatePublicKeyRecord = async (key, publicKey) => {
-  if (!Buffer.isBuffer(key)) {
-    throw errcode(new Error('"key" must be a Buffer'), 'ERR_INVALID_RECORD_KEY_NOT_BUFFER')
+  if (!(key instanceof Uint8Array)) {
+    throw errcode(new Error('"key" must be a Uint8Array'), 'ERR_INVALID_RECORD_KEY_NOT_BUFFER')
   }
 
-  if (key.length < 5) {
+  if (key.byteLength < 5) {
     throw errcode(new Error('invalid public key record'), 'ERR_INVALID_RECORD_KEY_TOO_SHORT')
   }
 
-  const prefix = key.slice(0, 4).toString()
+  const prefix = utf8Decoder.decode(key.subarray(0, 4))
 
   if (prefix !== '/pk/') {
     throw errcode(new Error('key was not prefixed with /pk/'), 'ERR_INVALID_RECORD_KEY_BAD_PREFIX')
@@ -32,7 +33,7 @@ const validatePublicKeyRecord = async (key, publicKey) => {
 
   const publicKeyHash = await multihashing(publicKey, 'sha2-256')
 
-  if (!keyhash.equals(publicKeyHash)) {
+  if (!uint8ArraysEqual(keyhash, publicKeyHash)) {
     throw errcode(new Error('public key does not match passed in key'), 'ERR_INVALID_RECORD_HASH_MISMATCH')
   }
 }

test/fixtures/go-key-records.js

@@ -1,8 +1,9 @@
 'use strict'
-const { Buffer } = require('buffer')
+
+const multibase = require('multibase')
+
 module.exports = {
-  publicKey: Buffer.from(
-    'CAASXjBcMA0GCSqGSIb3DQEBAQUAA0sAMEgCQQDjXAQQMal4SB2tSnX6NJIPmC69/BT8A8jc7/gDUZNkEhdhYHvc7k7S4vntV/c92nJGxNdop9fKJyevuNMuXhhHAgMBAAE=',
-    'base64'
+  publicKey: multibase.decode(
+    'MCAASXjBcMA0GCSqGSIb3DQEBAQUAA0sAMEgCQQDjXAQQMal4SB2tSnX6NJIPmC69/BT8A8jc7/gDUZNkEhdhYHvc7k7S4vntV/c92nJGxNdop9fKJyevuNMuXhhHAgMBAAE='
   )
 }

test/fixtures/go-record.js

@@ -1,5 +1,5 @@
 'use strict'
-const { Buffer } = require('buffer')
+const multibase = require('multibase')
 // Fixtures generated using gore (https://github.com/motemen/gore)
 //
 // :import github.com/libp2p/go-libp2p-record
@@ -18,12 +18,10 @@ const { Buffer } = require('buffer')
 // ioutil.WriteFile("js-libp2p-record/test/fixtures/record.bin", enc, 0644)
 // ioutil.WriteFile("js-libp2p-record/test/fixtures/record-signed.bin", enc2, 0644)
 module.exports = {
-  serialized: Buffer.from(
-    '0a0568656c6c6f1205776f726c641a2212201bd5175b1d4123ee29665348c60ea5cf5ac62e2e05215b97a7b9a9b0cf71d116',
-    'hex'
+  serialized: multibase.decode(
+    'f0a0568656c6c6f1205776f726c641a2212201bd5175b1d4123ee29665348c60ea5cf5ac62e2e05215b97a7b9a9b0cf71d116'
   ),
-  serializedSigned: Buffer.from(
-    '0a0568656c6c6f1205776f726c641a2212201bd5175b1d4123ee29665348c60ea5cf5ac62e2e05215b97a7b9a9b0cf71d116228001500fe7505698b8a873ccde6f1d36a2be662d57807490d9a9959540f2645a454bf615215092e10123f6ffc4ed694711bfbb1d5ccb62f3da83cf4528ee577a96b6cf0272eef9a920bd56459993690060353b72c22b8c03ad2a33894522dac338905b201179a85cb5e2fc68ed58be96cf89beec6dc0913887dddc10f202a2a1b117',
-    'hex'
+  serializedSigned: multibase.decode(
+    'f0a0568656c6c6f1205776f726c641a2212201bd5175b1d4123ee29665348c60ea5cf5ac62e2e05215b97a7b9a9b0cf71d116228001500fe7505698b8a873ccde6f1d36a2be662d57807490d9a9959540f2645a454bf615215092e10123f6ffc4ed694711bfbb1d5ccb62f3da83cf4528ee577a96b6cf0272eef9a920bd56459993690060353b72c22b8c03ad2a33894522dac338905b201179a85cb5e2fc68ed58be96cf89beec6dc0913887dddc10f202a2a1b117'
   )
 }

test/record.spec.js

@@ -4,7 +4,7 @@
 const chai = require('chai')
 chai.use(require('dirty-chai'))
 const expect = chai.expect
-const { Buffer } = require('buffer')
+const { utf8TextEncoder } = require('./utils')
 const libp2pRecord = require('../src')
 const Record = libp2pRecord.Record
 
@@ -15,28 +15,28 @@ const date = new Date(Date.UTC(2012, 1, 25, 10, 10, 10, 10))
 describe('record', () => {
   it('new', () => {
     const rec = new Record(
-      Buffer.from('hello'),
-      Buffer.from('world')
+      utf8TextEncoder.encode('hello'),
+      utf8TextEncoder.encode('world')
     )
 
-    expect(rec).to.have.property('key').eql(Buffer.from('hello'))
-    expect(rec).to.have.property('value').eql(Buffer.from('world'))
+    expect(rec).to.have.property('key').eql(utf8TextEncoder.encode('hello'))
+    expect(rec).to.have.property('value').eql(utf8TextEncoder.encode('world'))
   })
 
   it('serialize & deserialize', () => {
-    const rec = new Record(Buffer.from('hello'), Buffer.from('world'), date)
+    const rec = new Record(utf8TextEncoder.encode('hello'), utf8TextEncoder.encode('world'), date)
     const dec = Record.deserialize(rec.serialize())
 
-    expect(dec).to.have.property('key').eql(Buffer.from('hello'))
-    expect(dec).to.have.property('value').eql(Buffer.from('world'))
+    expect(dec).to.have.property('key').eql(utf8TextEncoder.encode('hello'))
+    expect(dec).to.have.property('value').eql(utf8TextEncoder.encode('world'))
     expect(dec.timeReceived).to.be.eql(date)
   })
 
   describe('go interop', () => {
     it('no signature', () => {
       const dec = Record.deserialize(fixture.serialized)
-      expect(dec).to.have.property('key').eql(Buffer.from('hello'))
-      expect(dec).to.have.property('value').eql(Buffer.from('world'))
+      expect(dec).to.have.property('key').eql(utf8TextEncoder.encode('hello'))
+      expect(dec).to.have.property('value').eql(utf8TextEncoder.encode('world'))
     })
   })
 })