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