98 lines
2.7 KiB
TypeScript
98 lines
2.7 KiB
TypeScript
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import type { EmailDraft } from "./types.js";
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/**
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* Convert a draft to RFC 5322 EML format with MIME multipart/alternative.
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*/
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export function draftToEml(draft: EmailDraft, from: string): string {
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const boundary = `----=_Part_${Date.now()}_${Math.random().toString(36).slice(2)}`;
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const date = new Date().toUTCString();
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const messageId = `<${Date.now()}.${Math.random().toString(36).slice(2)}@outreach.local>`;
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const toHeader = draft.recipient_name
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? `"${draft.recipient_name}" <${draft.recipient_email}>`
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: draft.recipient_email;
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const headers = [
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`From: ${from}`,
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`To: ${toHeader}`,
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`Subject: ${encodeSubject(draft.subject)}`,
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`Date: ${date}`,
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`Message-ID: ${messageId}`,
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`MIME-Version: 1.0`,
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`Content-Type: multipart/alternative; boundary="${boundary}"`,
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`X-Mailer: email-export-skill`,
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];
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const textPart = [
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`--${boundary}`,
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`Content-Type: text/plain; charset="utf-8"`,
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`Content-Transfer-Encoding: quoted-printable`,
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``,
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quotedPrintableEncode(draft.body_text),
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].join("\r\n");
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const htmlPart = [
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`--${boundary}`,
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`Content-Type: text/html; charset="utf-8"`,
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`Content-Transfer-Encoding: quoted-printable`,
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``,
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quotedPrintableEncode(draft.body_html),
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].join("\r\n");
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return [
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headers.join("\r\n"),
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``,
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textPart,
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``,
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htmlPart,
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``,
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`--${boundary}--`,
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``,
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].join("\r\n");
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}
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/** RFC 2047 encoded-word for non-ASCII subjects */
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function encodeSubject(subject: string): string {
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if (/^[\x20-\x7E]*$/.test(subject)) return subject;
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const encoded = Buffer.from(subject, "utf-8").toString("base64");
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return `=?UTF-8?B?${encoded}?=`;
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}
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/** Simple quoted-printable encoding */
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function quotedPrintableEncode(text: string): string {
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const lines: string[] = [];
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let current = "";
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for (const char of text) {
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const code = char.charCodeAt(0);
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let encoded: string;
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if (char === "\r" || char === "\n") {
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lines.push(current);
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current = "";
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continue;
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} else if (code === 9 || (code >= 32 && code <= 126 && char !== "=")) {
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encoded = char;
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} else {
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const buf = Buffer.from(char, "utf-8");
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encoded = Array.from(buf).map(b => `=${b.toString(16).toUpperCase().padStart(2, "0")}`).join("");
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}
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if (current.length + encoded.length > 75) {
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lines.push(current + "=");
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current = encoded;
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} else {
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current += encoded;
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}
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}
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if (current) lines.push(current);
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return lines.join("\r\n");
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}
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/** Generate a safe filename from draft */
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export function emlFilename(draft: EmailDraft, index: number): string {
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const domain = draft.recipient_email.split("@")[1] || "unknown";
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const safe = domain.replace(/[^a-zA-Z0-9.-]/g, "_");
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return `${String(index + 1).padStart(3, "0")}_${safe}.eml`;
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}
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