update: save srt files

vite.config.ts

@@ -10,8 +10,11 @@ import { parseMapNodes } from "./src/utils/map/mapNodeValidation";
 const __dirname = fileURLToPath(new URL(".", import.meta.url));
 
 const MAX_MAP_PAYLOAD_BYTES = 1024 * 1024;
+const MAX_SRT_PAYLOAD_BYTES = 256 * 1024;
 const JSON_HEADERS = { "Content-Type": "application/json" };
 type JsonResponseBody = Readonly<Record<string, string | boolean>>;
+const SRT_VOICES = new Set(["narrateur", "fermier", "electricienne"]);
+const SRT_LANGUAGES = new Set(["fr", "en"]);
 
 function sendJson(
   res: ServerResponse,
@@ -72,8 +75,84 @@ const saveMapPlugin = (): Plugin => ({
   },
 });
 
+const saveSrtPlugin = (): Plugin => ({
+  name: "save-srt-api",
+  configureServer(server) {
+    server.middlewares.use("/api/save-srt", async (req, res) => {
+      if (req.method !== "POST") {
+        sendJson(res, 405, { error: "Method not allowed" }, { Allow: "POST" });
+        return;
+      }
+
+      const chunks: Buffer[] = [];
+      let size = 0;
+
+      for await (const chunk of req) {
+        const buffer = Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk);
+        size += buffer.length;
+        if (size > MAX_SRT_PAYLOAD_BYTES) {
+          sendJson(res, 413, { error: "Payload too large" });
+          req.destroy();
+          return;
+        }
+        chunks.push(buffer);
+      }
+
+      try {
+        const data = JSON.parse(Buffer.concat(chunks).toString()) as unknown;
+        if (!isSrtPayload(data)) {
+          sendJson(res, 400, { error: "Invalid SRT payload" });
+          return;
+        }
+
+        const subtitlesRoot = path.resolve(
+          __dirname,
+          "public/sounds/dialogue/subtitles",
+        );
+        const srtPath = path.resolve(
+          subtitlesRoot,
+          data.language,
+          `${data.voice}.srt`,
+        );
+
+        if (!srtPath.startsWith(`${subtitlesRoot}${path.sep}`)) {
+          sendJson(res, 400, { error: "Invalid SRT path" });
+          return;
+        }
+
+        await fs.promises.mkdir(path.dirname(srtPath), { recursive: true });
+        await fs.promises.writeFile(srtPath, data.content, "utf8");
+        sendJson(res, 200, { success: true });
+      } catch (err) {
+        const status = err instanceof SyntaxError ? 400 : 500;
+        const message = err instanceof Error ? err.message : "Unknown error";
+        sendJson(res, status, { error: message });
+      }
+    });
+  },
+});
+
+interface SrtPayload {
+  voice: string;
+  language: string;
+  content: string;
+}
+
+function isSrtPayload(data: unknown): data is SrtPayload {
+  if (!data || typeof data !== "object") return false;
+
+  const payload = data as Partial<SrtPayload>;
+  return (
+    typeof payload.voice === "string" &&
+    SRT_VOICES.has(payload.voice) &&
+    typeof payload.language === "string" &&
+    SRT_LANGUAGES.has(payload.language) &&
+    typeof payload.content === "string"
+  );
+}
+
 export default defineConfig({
-  plugins: [react(), saveMapPlugin()],
+  plugins: [react(), saveMapPlugin(), saveSrtPlugin()],
   resolve: {
     alias: {
       "@": fileURLToPath(new URL("./src", import.meta.url)),