Add local Whisper speech input

tools/stt-server.mjs

@@ -0,0 +1,88 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import cors from 'cors';
+import express from 'express';
+import multer from 'multer';
+import { nodewhisper } from 'nodejs-whisper';
+
+const app = express();
+const port = Number(process.env.STT_PORT ?? 3334);
+const host = process.env.STT_HOST ?? '0.0.0.0';
+const uploadDir = path.resolve(process.cwd(), '.stt-uploads');
+const modelRootPath = path.resolve(process.cwd(), '.whisper-models');
+const modelName = process.env.STT_MODEL ?? 'tiny.en';
+
+fs.mkdirSync(uploadDir, { recursive: true });
+fs.mkdirSync(modelRootPath, { recursive: true });
+
+const upload = multer({ dest: uploadDir });
+
+app.use(cors());
+
+app.get('/health', (_request, response) => {
+  response.json({ ok: true, model: modelName });
+});
+
+app.post('/transcribe', upload.single('audio'), async (request, response) => {
+  if (!request.file) {
+    response.status(400).json({ error: 'Missing audio file' });
+    return;
+  }
+
+  try {
+    const text = await nodewhisper(request.file.path, {
+      modelName,
+      autoDownloadModelName: modelName,
+      modelRootPath,
+      removeWavFileAfterTranscription: true,
+      withCuda: false,
+      logger: quietLogger,
+      whisperOptions: {
+        outputInText: false,
+        outputInSrt: false,
+        outputInVtt: false,
+        outputInCsv: false,
+        outputInJson: false,
+        outputInJsonFull: false,
+        outputInLrc: false,
+        outputInWords: false,
+        translateToEnglish: false,
+        splitOnWord: true,
+        noGpu: true,
+      },
+    });
+
+    response.json({ text: cleanTranscript(text) });
+  } catch (error) {
+    response.status(500).json({ error: error instanceof Error ? error.message : String(error) });
+  } finally {
+    safeUnlink(request.file.path);
+  }
+});
+
+app.listen(port, host, () => {
+  console.log(`STT server listening on http://${host}:${port}`);
+  console.log(`Whisper model: ${modelName}`);
+});
+
+const quietLogger = {
+  debug: () => undefined,
+  info: () => undefined,
+  log: () => undefined,
+  warn: console.warn,
+  error: console.error,
+};
+
+function cleanTranscript(value) {
+  return String(value)
+    .replace(/\[[^\]]*\]/g, ' ')
+    .replace(/\([^)]*\)/g, ' ')
+    .replace(/\s+/g, ' ')
+    .trim();
+}
+
+function safeUnlink(filePath) {
+  if (filePath && fs.existsSync(filePath)) {
+    fs.unlinkSync(filePath);
+  }
+}