feat: add function to standardize uploaded csv in batch signup

src/pages/course/[name]/members.vue

@@ -48,12 +48,32 @@ const forceUpdate = ref(false);
 const isProcessingSignup = ref(false);
 const errorMsg = ref("");
 const previewCSV = ref<{ headers?: string[]; body?: string[][] }>({});
+
+// no csv validation was handled
+const standardizeUsername = (csv: string): string => {
+  const rows = csv.split("\n");
+  const header = rows[0];
+  const body = rows.slice(1).map((r) => r.split(","));
+  const usernameFieldIndex = header.split(",").findIndex((v) => v === "username");
+  if (usernameFieldIndex < 0) {
+    return csv;
+  }
+
+  body.forEach((data) => {
+    data[usernameFieldIndex] = data[usernameFieldIndex]?.toUpperCase();
+  });
+
+  const bodyString = body.map((data) => data.join(","));
+  return [header, ...bodyString].join("\n");
+};
+
 watch(newMembers, () => {
   if (!newMembers.value) return;
   const reader = new FileReader();
   reader.onload = (evt) => {
     if (typeof evt.target?.result !== "string") return;
-    newMembersCSVString.value = evt.target?.result;
+    newMembersCSVString.value = standardizeUsername(evt.target?.result || "");
+
     const rows = newMembersCSVString.value.split("\n");
     previewCSV.value.headers = rows[0].split(",");
     previewCSV.value.body = rows.slice(1).map((r) => r.split(","));