Generate .env file after build if not exists

.gitignore

@@ -6,3 +6,4 @@ wasm-pack.log
 node_modules
 /build/*/**
 !/build/*/package.json
+.env

bin/generate-dotenv.js

@@ -0,0 +1,33 @@
+const fs = require("fs");
+const path = require("path");
+const opaque = require("../build/ristretto");
+
+function fileExists(file) {
+  try {
+    fs.accessSync(file, fs.constants.F_OK);
+    return true;
+  } catch (err) {
+    return false;
+  }
+}
+
+async function main() {
+  const baseDir = path.join(__dirname, "..");
+  const envFile = path.join(baseDir, ".env");
+
+  if (fileExists(envFile)) {
+    console.log("opaque .env file already exists, skipping .env write");
+    return;
+  }
+
+  await opaque.ready;
+  const serverSetup = opaque.server.createSetup();
+
+  const dotEnv = `OPAQUE_SERVER_SETUP=${serverSetup}\n`;
+
+  console.log("writing opaque .env file");
+
+  fs.writeFileSync(envFile, dotEnv);
+}
+
+main();

package.json

@@ -20,7 +20,8 @@
     "typescript": "5.1.3"
   },
   "scripts": {
-    "build": "node ./bin/build.js",
+    "build": "node ./bin/build.js && pnpm gen:dotenv",
+    "gen:dotenv": "node ./bin/generate-dotenv.js",
     "example:fullstack-simple-nextjs:dev": "cd examples/fullstack-simple-nextjs && cross-env OPAQUE_SERVER_SETUP=Ki5T3U21n_UFhcGP5fR_mUstYEItKRsjEJ2UnvvrGasT3wvjdtbluS0BsiR_LtzqX8YLrCyWqQOJDf7cL0C8DRr9pGFBSx0X22ZujePyWpdq4VddBSPm0vIXepDJEBYJjRxmRNh09pLGxk_Y9bQuFWjYInqjcy_zOVsMHPHUkQw pnpm dev",
     "example:client-simple-webpack:dev": "cd examples/client-simple-webpack && pnpm dev",
     "example:client-with-password-reset:dev": "cd examples/client-with-password-reset && pnpm dev",