feat: name dragged/exported .eml files as "date (from-to) subject" with ASCII-only chars

2026-05-22 14:28:36 +02:00
parent 0245ec67e1
commit 8bcb487442
3 changed files with 51 additions and 37 deletions
@@ -0,0 +1,43 @@
+import type { Email } from "@/lib/jmap/types";
+
+// Restrict filenames to ASCII letters/digits and a small set of safe
+// punctuation. Everything else collapses to `_`. Keeps names predictable
+// across Windows/macOS/Linux file systems and avoids emoji/RTL/zero-width
+// surprises in subject lines.
+const SAFE_CHARS = /[^A-Za-z0-9 _\-().,!@#&+=[\]{}']/g;
+
+function sanitizePart(input: string, maxLen: number): string {
+  const cleaned = input
+    .replace(SAFE_CHARS, "_")
+    .replace(/_+/g, "_")
+    .replace(/\s+/g, " ")
+    .trim()
+    .replace(/^[._-]+|[._-]+$/g, "");
+  return cleaned.slice(0, maxLen);
+}
+
+function formatDate(iso: string | null | undefined): string {
+  const d = iso ? new Date(iso) : new Date();
+  if (Number.isNaN(d.getTime())) return "0000-00-00 00.00.00";
+  const pad = (n: number) => String(n).padStart(2, "0");
+  return (
+    `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ` +
+    `${pad(d.getHours())}.${pad(d.getMinutes())}.${pad(d.getSeconds())}`
+  );
+}
+
+function addressLabel(addr: { name?: string | null; email: string } | undefined, maxLen = 30): string {
+  if (!addr) return "unknown";
+  const raw = (addr.name && addr.name.trim()) || addr.email.split("@")[0] || addr.email;
+  return sanitizePart(raw, maxLen) || "unknown";
+}
+
+// Produce `YYYY-MM-DD HH.mm.SS (from-to) subject.eml`. All components are
+// sanitized to ASCII-safe filename characters.
+export function emailExportFilename(email: Email): string {
+  const date = formatDate(email.receivedAt || email.sentAt);
+  const from = addressLabel(email.from?.[0]);
+  const to = addressLabel(email.to?.[0]);
+  const subject = sanitizePart(email.subject || "no subject", 80) || "no subject";
+  return `${date} (${from}-${to}) ${subject}.eml`;
+}