Usability and test infrastructure updates.

src/server/transcribe.ts

@@ -324,14 +324,16 @@ interface TranscribeParams {
   task: WhisperTask;
 }
 
-/** Parse + validate query params; a string is the 400 error text. */
-function parseParams(url: URL): TranscribeParams | string {
-  const modelId = url.searchParams.get("model");
-  if (!modelId) return "missing model parameter";
-  const fasterWhisperModel = getFasterWhisperModel(modelId);
-  // Catalog-only (D-006/D-013): never forward arbitrary ids to the sidecar.
-  if (!fasterWhisperModel) return `unknown model: ${modelId}`;
-
+/**
+ * Parse + validate the `language`/`task` query params shared by both the
+ * HTTP (`POST /api/transcribe`) and WebSocket (`GET /api/transcribe/live`,
+ * src/server/live.ts) entry points, so a live session can't forward an
+ * unvalidated string into the sidecar protocol just because it skips
+ * `parseParams` below. A string return is the 400 error text.
+ */
+export function parseLanguageAndTask(
+  url: URL,
+): { language?: string; task: WhisperTask } | string {
   const rawLanguage = url.searchParams.get("language");
   let language: string | undefined;
   if (rawLanguage !== null && rawLanguage !== "" && rawLanguage !== "auto") {
@@ -344,7 +346,21 @@ function parseParams(url: URL): TranscribeParams | string {
     return `invalid task: ${rawTask}`;
   }
 
-  return { modelId, fasterWhisperModel, language, task: rawTask };
+  return { language, task: rawTask };
+}
+
+/** Parse + validate query params; a string is the 400 error text. */
+function parseParams(url: URL): TranscribeParams | string {
+  const modelId = url.searchParams.get("model");
+  if (!modelId) return "missing model parameter";
+  const fasterWhisperModel = getFasterWhisperModel(modelId);
+  // Catalog-only (D-006/D-013): never forward arbitrary ids to the sidecar.
+  if (!fasterWhisperModel) return `unknown model: ${modelId}`;
+
+  const options = parseLanguageAndTask(url);
+  if (typeof options === "string") return options;
+
+  return { modelId, fasterWhisperModel, ...options };
 }
 
 /**