Merge pull request #636 from semaphore-protocol/refactor/download-artifacts

0-dependency script to download SNARK artifacts

Former-commit-id: a8322fd95c

packages/circuits/package.json

@@ -30,7 +30,7 @@
     "devDependencies": {
         "@types/mocha": "^10.0.6",
         "@zk-kit/eddsa-poseidon": "0.3.1",
-        "@zk-kit/imt": "^2.0.0-beta",
+        "@zk-kit/imt": "^2.0.0-beta.1",
         "circomkit": "^0.0.19",
         "mocha": "^10.2.0",
         "poseidon-lite": "^0.2.0"

packages/data/rollup.config.ts

@@ -19,7 +19,7 @@ export default {
         { file: pkg.exports.require, format: "cjs", banner, exports: "auto" },
         { file: pkg.exports.default, format: "es", banner }
     ],
-    external: Object.keys(pkg.dependencies),
+    external: [...Object.keys(pkg.dependencies), "ethers/contract", "ethers/constants", "ethers/providers"],
     plugins: [
         json(),
         typescript({ tsconfig: "./build.tsconfig.json", useTsconfigDeclarationDir: true }),

packages/proof/package.json

@@ -54,9 +54,7 @@
     },
     "dependencies": {
         "@types/snarkjs": "0.7.8",
-        "download": "8.0.0",
         "ethers": "6.10.0",
-        "snarkjs": "0.7.3",
-        "tmp": "0.2.1"
+        "snarkjs": "0.7.3"
     }
 }

packages/proof/rollup.browser.config.ts

@@ -23,7 +23,18 @@ export default {
             banner
         }
     ],
-    external: Object.keys(pkg.dependencies),
+    external: [
+        ...Object.keys(pkg.dependencies),
+        "node:fs",
+        "node:fs/promises",
+        "node:os",
+        "node:path",
+        "node:stream",
+        "node:stream/promises",
+        "ethers/crypto",
+        "ethers/utils",
+        "ethers/abi"
+    ],
     plugins: [
         alias({
             entries: [{ find: "./get-snark-artifacts.node", replacement: "./get-snark-artifacts.browser" }]

packages/proof/rollup.node.config.ts

@@ -28,7 +28,18 @@ export default {
             banner
         }
     ],
-    external: [...Object.keys(pkg.dependencies), "fs"],
+    external: [
+        ...Object.keys(pkg.dependencies),
+        "node:fs",
+        "node:fs/promises",
+        "node:os",
+        "node:path",
+        "node:stream",
+        "node:stream/promises",
+        "ethers/crypto",
+        "ethers/utils",
+        "ethers/abi"
+    ],
     plugins: [
         typescript({
             tsconfig: "./build.tsconfig.json",

packages/proof/src/get-snark-artifacts.node.ts

@@ -1,16 +1,40 @@
 /* istanbul ignore file */
-import download from "download"
-import fs from "fs"
-import tmp from "tmp"
+import { createWriteStream, existsSync, readdirSync } from "node:fs"
+import { mkdir } from "node:fs/promises"
+import os from "node:os"
+import { dirname } from "node:path"
+import { Readable } from "node:stream"
+import { finished } from "node:stream/promises"
 import { SnarkArtifacts } from "./types"
 
+async function download(url: string, outputPath: string) {
+    const response = await fetch(url)
+
+    if (!response.ok) {
+        throw new Error(`Failed to fetch ${url}: ${response.statusText}`)
+    }
+
+    // Ensure the directory exists.
+    const dir = dirname(outputPath)
+    await mkdir(dir, { recursive: true })
+
+    const fileStream = createWriteStream(outputPath)
+    await finished(Readable.fromWeb(response.body as any).pipe(fileStream))
+}
+
 export default async function getSnarkArtifacts(treeDepth: number): Promise<SnarkArtifacts> {
     const tmpDir = "semaphore-proof"
-    const tmpPath = `${tmp.tmpdir}/${tmpDir}-${treeDepth}`
+    const tmpPath = `${os.tmpdir()}/${tmpDir}-${treeDepth}`
 
-    if (!fs.existsSync(tmpPath) || fs.readdirSync(tmpPath).length !== 2) {
-        await download(`https://semaphore.cedoor.dev/artifacts/${treeDepth}/semaphore.wasm`, tmpPath)
-        await download(`https://semaphore.cedoor.dev/artifacts/${treeDepth}/semaphore.zkey`, tmpPath)
+    if (!existsSync(tmpPath) || readdirSync(tmpPath).length !== 2) {
+        await download(
+            `https://semaphore.cedoor.dev/artifacts/${treeDepth}/semaphore.wasm`,
+            `${tmpPath}/semaphore.wasm`
+        )
+        await download(
+            `https://semaphore.cedoor.dev/artifacts/${treeDepth}/semaphore.zkey`,
+            `${tmpPath}/semaphore.zkey`
+        )
     }
 
     return {

yarn.lock.REMOVED.git-id

@@ -1 +1 @@
-0764f553045d18f101b23f70b982ee1b83db9004
+c846531c38bcc21c8c7ebc08e5d175f80dc77ac6