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59 lines
2.6 KiB
TypeScript
59 lines
2.6 KiB
TypeScript
/**
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* Parsing helpers for RFC 5322 mailboxes (`Display Name <addr@example.com>`).
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*
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* Address data reaches us from places that do not keep the display name and
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* the address apart: vCard `FN` fields that hold the whole mailbox, Sent-folder
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* headers, `Identity.name` on some servers. Handing such a string back to a
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* server as a structured display name produces a doubled, invalid mailbox
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* (`"Jane <j@x.com>" <j@x.com>`), which mail servers then re-parse into a
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* broken envelope recipient (#672). These helpers reduce any of those forms to
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* a clean name/address pair.
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*/
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/** Strips a surrounding quoted-string (and its escapes) from a display name. */
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export function unquoteDisplayName(name: string): string {
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const trimmed = name.trim();
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if (trimmed.length >= 2 && trimmed.startsWith('"') && trimmed.endsWith('"')) {
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return trimmed.slice(1, -1).replace(/\\(["\\])/g, '$1').trim();
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}
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return trimmed;
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}
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/**
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* Reduces a display name to just the name: unquotes it and drops an address it
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* carries inline, whether or not the angle brackets are balanced
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* (`Jane <j@x.com>`, `Jane<j@x.com` → `Jane`).
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*/
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export function sanitizeDisplayName(name: string | undefined | null): string {
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if (!name) return '';
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return unquoteDisplayName(unquoteDisplayName(name).replace(/\s*<[^<>]*>?\s*$/, ''));
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}
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/** The addr-spec a mailbox string carries, or '' when it has none. */
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function extractAddrSpec(value: string): string {
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// Prefer the last angle-bracketed run - a display name that embeds an
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// address puts an earlier, redundant copy in front of the real one. The
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// closing bracket is optional so a truncated `Jane<j@x.com` still resolves.
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const angle = value.match(/<([^<>]*)>?\s*$/);
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if (angle) return angle[1].trim();
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// No brackets: the whole string is the address, if it looks like one at all.
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return value.includes('@') ? value : '';
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}
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/**
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* Splits an RFC 5322 mailbox into its display name and addr-spec. Accepts the
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* malformed shapes above; the returned name never contains an address and the
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* returned email is always a bare addr-spec. `name` is omitted when there is
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* no display name distinct from the address.
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*/
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export function splitMailbox(value: string): { name?: string; email: string } {
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const trimmed = value.trim();
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const email = extractAddrSpec(trimmed);
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if (!email) return { email: trimmed };
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// Everything ahead of the address is the display name.
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const nameSource = trimmed.slice(0, trimmed.lastIndexOf(email)).replace(/<\s*$/, '');
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const name = sanitizeDisplayName(nameSource);
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return name && name !== email ? { name, email } : { email };
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}
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