feat: initial commit

.github/workflows/build.yml

@@ -0,0 +1,30 @@
+name: Build
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+      - name: Setup Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          registry-url: https://registry.npmjs.org/
+          cache: 'pnpm'
+      - name: Install
+        run: pnpm install
+      - name: Test
+        run: pnpm test

.github/workflows/release.yml

@@ -0,0 +1,43 @@
+on:
+  push:
+    branches:
+      - main
+name: Release
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: googleapis/release-please-action@v4
+        id: release
+        with:
+          release-type: node
+          package-name: piece-hasher-worker
+      - name: Checkout
+        uses: actions/checkout@v3
+        if: ${{ steps.release.outputs.release_created }}
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+        if: ${{ steps.release.outputs.release_created }}
+      - name: Setup Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          registry-url: https://registry.npmjs.org/
+          cache: 'pnpm'
+        if: ${{ steps.release.outputs.release_created }}
+      - name: Install Dependencies
+        run: pnpm install
+        if: ${{ steps.release.outputs.release_created }}
+      - name: Build
+        run: pnpm build
+        if: ${{ steps.release.outputs.release_created }}
+      - name: Publish to npm
+        run: npm publish --access=public
+        env:
+          NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}
+        if: ${{ steps.release.outputs.release_created }}

.gitignore

@@ -0,0 +1,3 @@
+node_modules
+dist
+*.min.js

LICENSE.md

@@ -0,0 +1,204 @@
+The contents of this repository are Copyright (c) corresponding authors and
+contributors, licensed under the `Permissive License Stack` meaning either of:
+
+- Apache-2.0 Software License: https://www.apache.org/licenses/LICENSE-2.0
+  ([...4tr2kfsq](https://dweb.link/ipfs/bafkreiankqxazcae4onkp436wag2lj3ccso4nawxqkkfckd6cg4tr2kfsq))
+
+- MIT Software License: https://opensource.org/licenses/MIT
+  ([...vljevcba](https://dweb.link/ipfs/bafkreiepofszg4gfe2gzuhojmksgemsub2h4uy2gewdnr35kswvljevcba))
+
+You may not use the contents of this repository except in compliance
+with one of the listed Licenses. For an extended clarification of the
+intent behind the choice of Licensing please refer to
+https://protocol.ai/blog/announcing-the-permissive-license-stack/
+
+Unless required by applicable law or agreed to in writing, software
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+either express or implied. See each License for the specific language
+governing permissions and limitations under that License.
+
+<!--- SPDX-License-Identifier: Apache-2.0 OR MIT -->
+
+`SPDX-License-Identifier: Apache-2.0 OR MIT`
+
+Verbatim copies of both licenses are included below:
+
+<details><summary>Apache-2.0 Software License</summary>
+
+```
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+   1. Definitions.
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
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+      whether in tort (including negligence), contract, or otherwise,
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+   END OF TERMS AND CONDITIONS
+```
+
+</details>
+
+<details><summary>MIT Software License</summary>
+
+```
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
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+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+```
+
+</details>

README.md

@@ -0,0 +1,61 @@
+# piece-hasher-worker
+
+Web worker for creating piece hashes.
+
+Piece hashes are the primary means of addressing data stored on Filecoin. Piece hashes are generated on the client for provability and verification, however they are computationally expensive to create. By moving the work into a dedicated web worker the main thread does not get blocked.
+
+## Install
+
+```sh
+npm install @web3-storage/piece-hasher-worker
+```
+
+## Usage
+
+1. Import the module in your application:
+
+    ```js
+    import * as PieceHasher from '@web3-storage/piece-hasher-worker'
+    ```
+2. Make the worker script available for your application to download. i.e. the file at `./node_modules/@web3-storage/piece-hasher-worker/worker.js`
+3. Create a hasher passing the worker script URL, and create a multihash from some data:
+    ```js
+    const pieceHasher = PieceHasher.create('https://example.org/worker.js')
+    const digest = await pieceHasher.digest(crypto.getRandomValues(new Uint8Array(100)))
+    ```
+4. Optionally, build a CID from the returned multihash:
+    ```js
+    import * as Link from 'multiformats/link'
+    import * as raw from 'multiformats/codecs/raw'
+
+    const cid = Link.create(raw.code, digest)
+    console.log(cid.toString())
+    ```
+
+### Example
+
+Use with the web3.storage client:
+
+```js
+import * as Client from '@web3-storage/w3up-client'
+import * as PieceHasher from '@web3-storage/piece-hasher-worker'
+
+const client = Client.create(/* ... */)
+const pieceHasher = PieceHasher.create('https://example.org/worker.js')
+
+const cid = await client.uploadFile(new Blob(['some data']), {
+  pieceHasher,
+  onShardStored ({ piece }) {
+    console.log(`Stored a shard with Piece CID: ${piece}`)
+  }
+})
+console.log(cid.toString())
+```
+
+## Contributing
+
+Feel free to join in. All welcome. [Open an issue](https://github.com/storacha-network/piece-hasher-worker/issues)!
+
+## License
+
+Dual-licensed under [MIT + Apache 2.0](LICENSE.md)

main.js

@@ -0,0 +1,51 @@
+import { name, code } from '@web3-storage/data-segment/multihash'
+import { decode as decodeDigest } from 'multiformats/hashes/digest'
+
+export { name, code }
+
+/**
+ * @param {string|URL} workerURL
+ * @returns {import('multiformats').MultihashHasher<typeof code>}
+ */
+export const create = workerURL => new PieceHasher(workerURL)
+
+class PieceHasher {
+  #workerURL
+
+  /** @param {string|URL} workerURL */
+  constructor (workerURL) {
+    this.#workerURL = workerURL
+  }
+
+  get code () {
+    return code
+  }
+
+  get name () {
+    return name
+  }
+
+  /** @param {Uint8Array} input */
+  digest (input) {
+    return digest(input, this.#workerURL)
+  }
+}
+
+/**
+ * @param {Uint8Array} input
+ * @param {string|URL} [workerURL]
+ */
+export const digest = async (input, workerURL) => {
+  const bytes = await new Promise((resolve, reject) => {
+    const worker = new Worker(workerURL ?? 'worker.min.js')
+    worker.onmessage = e => resolve(e.data)
+    worker.onerror = e => {
+      console.error(e)
+      reject(e.error)
+    }
+    worker.postMessage(input)
+  })
+  return /** @type {import('multiformats').MultihashDigest<typeof code>} */ (
+    decodeDigest(bytes)
+  )
+}