Return an error on unknown model in new conversation (#916)

src/routes/conversation/+server.ts

@@ -16,14 +16,19 @@ export const POST: RequestHandler = async ({ locals, request }) => {
 
  let title = "";
 
- const values = z
+ const parsedBody = z
  .object({
  fromShare: z.string().optional(),
  model: validateModel(models),
  assistantId: z.string().optional(),
  preprompt: z.string().optional(),
  })
- .parse(JSON.parse(body));
+ .safeParse(JSON.parse(body));
+
+ if (!parsedBody.success) {
+ throw error(400, "Invalid request");
+ }
+ const values = parsedBody.data;
 
  const convCount = await collections.conversations.countDocuments(authCondition(locals));
 
@@ -34,14 +39,13 @@ export const POST: RequestHandler = async ({ locals, request }) => {
  );
  }
 
- // get preprompt from assistant if it exists
-
  const model = models.find((m) => m.name === values.model);
 
  if (!model) {
  throw error(400, "Invalid model");
  }
 
+ // get preprompt from assistant if it exists
  const assistant = await collections.assistants.findOne({
  _id: new ObjectId(values.assistantId),
  });