feat: store blocks under multihash key

Related to ipfs/js-ipfs#2415

Author: AuHau

README.md

@@ -236,9 +236,9 @@ const ipfs = ipfsClient({
   - [`ipfs.refs(ipfsPath, [options], [callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/REFS.md#refs)
   - [`ipfs.refsReadableStream(ipfsPath, [options], [callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/REFS.md#refsreadablestream)
   - [`ipfs.refsPullStream(ipfsPath, [options], [callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/REFS.md#refspullstream)
-  - [`ipfs.refs.local([callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/REFS.md#refslocal)
-  - [`ipfs.refs.localReadableStream([callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/REFS.md#refslocalreadablestream)
-  - [`ipfs.refs.localPullStream([callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/REFS.md#refslocalpullstream)
+  - [`ipfs.refs.local([options], [callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/REFS.md#refslocal)
+  - [`ipfs.refs.localReadableStream([options], [callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/REFS.md#refslocalreadablestream)
+  - [`ipfs.refs.localPullStream([options], [callback])`](https://github.com/ipfs/interface-ipfs-core/blob/master/SPEC/REFS.md#refslocalpullstream)
 
 #### Graph
 

src/files-regular/refs-local.js

@@ -9,10 +9,17 @@ module.exports = configure(({ ky }) => {
   return async function * refsLocal (options) {
     options = options || {}
 
+    const searchParams = new URLSearchParams()
+
+    if (options.multihash !== undefined) {
+      searchParams.set('multihash', options.multihash)
+    }
+
     const res = await ky.get('refs/local', {
       timeout: options.timeout,
       signal: options.signal,
-      headers: options.headers
+      headers: options.headers,
+      searchParams
     })
 
     for await (const file of ndjson(toIterable(res.body))) {