fix: CID.parse(base36) (#307)

This aims to support base36 out of the box, without having to specify
the 'base' parameter explicitly.

Rationale is that base36 is used across ecosystem for PeerIDs that have
to be represented in base36 to fit in a single DNS label (due to limit
of 63 characters).

Author: lidel

src/cid.ts

@@ -1,4 +1,5 @@
 import { base32 } from './bases/base32.js'
+import { base36 } from './bases/base36.js'
 import { base58btc } from './bases/base58.js'
 import { coerce } from './bytes.js'
 import * as Digest from './hashes/digest.js'
@@ -402,10 +403,14 @@ function parseCIDtoBytes <Prefix extends string, Data, Code extends number, Alg
       const decoder = base ?? base32
       return [base32.prefix as Prefix, decoder.decode(source)]
     }
+    case base36.prefix: {
+      const decoder = base ?? base36
+      return [base36.prefix as Prefix, decoder.decode(source)]
+    }
     default: {
       if (base == null) {
         throw Error(
-          'To parse non base32 or base58btc encoded CID multibase decoder must be provided'
+          'To parse non base32, base36 or base58btc encoded CID multibase decoder must be provided'
         )
       }
       return [source[0] as Prefix, base.decode(source)]

test/test-cid.spec.ts

@@ -3,6 +3,7 @@
 import { assert } from 'aegir/chai'
 import OLDCID from 'cids'
 import { base32 } from '../src/bases/base32.js'
+import { base36 } from '../src/bases/base36.js'
 import { base58btc } from '../src/bases/base58.js'
 import { base64 } from '../src/bases/base64.js'
 import { fromHex, toHex, equals } from '../src/bytes.js'
@@ -568,7 +569,15 @@ describe('CID', () => {
       const hash = await sha256.digest(textEncoder.encode('abc'))
       const cid = CID.create(1, 112, hash)
 
-      const parsed = CID.parse(cid.toString())
+      const parsed = CID.parse(cid.toString(base32))
+      digestsame(cid, parsed)
+    })
+
+    it('parse 36 encoded CIDv1', async () => {
+      const hash = await sha256.digest(textEncoder.encode('abc'))
+      const cid = CID.create(1, 112, hash)
+
+      const parsed = CID.parse(cid.toString(base36))
       digestsame(cid, parsed)
     })
 
@@ -592,7 +601,7 @@ describe('CID', () => {
       const hash = await sha256.digest(textEncoder.encode('abc'))
       const cid = CID.create(1, 112, hash)
       const msg =
-        'To parse non base32 or base58btc encoded CID multibase decoder must be provided'
+        'To parse non base32, base36 or base58btc encoded CID multibase decoder must be provided'
 
       assert.throws(() => CID.parse(cid.toString(base64)), msg)
     })