feat(email-to-pdf): add inline images, clickable links, and embedded attachments
- Add CID inline image support via base64 data URI replacement - Implement clickable link extraction from HTML anchors using regex - Embed email attachments into PDF using pymupdf embfile_add - Reduce font sizes for more compact PDF output (18px subject, 12px body) - Format date with timezone (UTC+HH:MM) while preserving original time - Clean email address formatting (Name (email) instead of <brackets>) - Add UI options: page size selector, CC/BCC toggle, attachments toggle
This commit is contained in:
abdullahalam123
393
src/js/logic/email-to-pdf.ts
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393
src/js/logic/email-to-pdf.ts
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import PostalMime from 'postal-mime';
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import MsgReader from '@kenjiuno/msgreader';
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import { formatBytes, escapeHtml } from '../utils/helpers.js';
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import type { EmailAttachment, ParsedEmail, EmailRenderOptions } from '@/types';
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// Re-export types for convenience
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export type { EmailAttachment, ParsedEmail, EmailRenderOptions };
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/**
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* Format email address without angle brackets for cleaner display
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*/
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function formatAddress(
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name: string | undefined,
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email: string | undefined
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): string {
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if (name && email) {
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return `${name} (${email})`;
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}
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return email || name || '';
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}
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export async function parseEmlFile(file: File): Promise<ParsedEmail> {
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const arrayBuffer = await file.arrayBuffer();
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const parser = new PostalMime();
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const email = await parser.parse(arrayBuffer);
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const from =
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formatAddress(email.from?.name, email.from?.address) || 'Unknown Sender';
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const to = (email.to || [])
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.map((addr) => formatAddress(addr.name, addr.address))
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.filter(Boolean);
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const cc = (email.cc || [])
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.map((addr) => formatAddress(addr.name, addr.address))
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.filter(Boolean);
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const bcc = (email.bcc || [])
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.map((addr) => formatAddress(addr.name, addr.address))
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.filter(Boolean);
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// Helper to map parsing result to EmailAttachment
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const mapAttachment = (att: any): EmailAttachment => {
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let content: Uint8Array | undefined;
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let size = 0;
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if (att.content) {
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if (att.content instanceof ArrayBuffer) {
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content = new Uint8Array(att.content);
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size = content.byteLength;
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} else if (att.content instanceof Uint8Array) {
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content = att.content;
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size = content.byteLength;
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}
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}
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return {
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filename: att.filename || 'unnamed',
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size,
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contentType: att.mimeType || 'application/octet-stream',
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content,
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contentId: att.contentId
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? att.contentId.replace(/^<|>$/g, '')
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: undefined,
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};
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};
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const attachments: EmailAttachment[] = [
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...(email.attachments || []).map(mapAttachment),
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...((email as any).inline || []).map(mapAttachment),
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];
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// Preserve original date string from headers
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let rawDateString = '';
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if (email.headers) {
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const dateHeader = email.headers.find(
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(h) => h.key.toLowerCase() === 'date'
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);
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if (dateHeader) {
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rawDateString = dateHeader.value as string;
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}
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}
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if (!rawDateString && email.date) {
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rawDateString = email.date; // fallback if header missing but parsed date exists as string?
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}
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let parsedDate: Date | null = null;
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if (email.date) {
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try {
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parsedDate = new Date(email.date);
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if (isNaN(parsedDate.getTime())) {
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parsedDate = null;
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}
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} catch {
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parsedDate = null;
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}
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}
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return {
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subject: email.subject || '(No Subject)',
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from,
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to,
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cc,
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bcc,
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date: parsedDate,
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rawDateString,
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htmlBody: email.html || '',
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textBody: email.text || '',
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attachments,
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};
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}
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export async function parseMsgFile(file: File): Promise<ParsedEmail> {
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const arrayBuffer = await file.arrayBuffer();
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const msgReader = new MsgReader(arrayBuffer);
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const msgData = msgReader.getFileData();
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const from =
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formatAddress(msgData.senderName, msgData.senderEmail) || 'Unknown Sender';
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const to: string[] = [];
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const cc: string[] = [];
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const bcc: string[] = [];
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if (msgData.recipients) {
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for (const recipient of msgData.recipients) {
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const recipientStr = formatAddress(recipient.name, recipient.email);
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if (!recipientStr) continue;
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const recipType = String(recipient.recipType).toLowerCase();
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if (recipType === 'cc' || recipType === '2') {
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cc.push(recipientStr);
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} else if (recipType === 'bcc' || recipType === '3') {
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bcc.push(recipientStr);
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} else {
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to.push(recipientStr);
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}
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}
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}
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const attachments: EmailAttachment[] = (msgData.attachments || []).map(
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(att: any) => ({
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filename: att.fileName || att.name || 'unnamed',
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size: att.content?.length || 0,
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contentType: att.mimeType || 'application/octet-stream',
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content: att.content ? new Uint8Array(att.content) : undefined,
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contentId: att.pidContentId
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? att.pidContentId.replace(/^<|>$/g, '')
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: undefined,
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})
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);
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let date: Date | null = null;
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let rawDateString = '';
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if (msgData.messageDeliveryTime) {
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rawDateString = msgData.messageDeliveryTime;
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date = new Date(msgData.messageDeliveryTime);
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} else if (msgData.clientSubmitTime) {
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rawDateString = msgData.clientSubmitTime;
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date = new Date(msgData.clientSubmitTime);
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}
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return {
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subject: msgData.subject || '(No Subject)',
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from,
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to,
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cc,
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bcc,
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date,
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rawDateString,
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htmlBody: msgData.bodyHtml || '',
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textBody: msgData.body || '',
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attachments,
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};
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}
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/**
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* Formats a raw RFC 2822 date string into a nicer human-readable format,
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* while preserving the original timezone and time.
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* Example input: "Sun, 8 Jan 2017 20:37:44 +0200"
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* Example output: "Sunday, January 8, 2017 at 8:37 PM (+0200)"
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*/
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function formatRawDate(raw: string): string {
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try {
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// Regex to parse RFC 2822 date parts: Day, DD Mon YYYY HH:MM:SS Timezone
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const match = raw.match(
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/([A-Za-z]{3}),\s+(\d{1,2})\s+([A-Za-z]{3})\s+(\d{4})\s+(\d{2}):(\d{2})(?::(\d{2}))?\s+([+-]\d{4})/
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);
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if (match) {
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const [
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,
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dayAbbr,
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dom,
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monthAbbr,
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year,
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hoursStr,
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minsStr,
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secsStr,
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timezone,
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] = match;
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// Map abbreviations to full names
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const days: Record<string, string> = {
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Sun: 'Sunday',
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Mon: 'Monday',
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Tue: 'Tuesday',
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Wed: 'Wednesday',
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Thu: 'Thursday',
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Fri: 'Friday',
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Sat: 'Saturday',
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};
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const months: Record<string, string> = {
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Jan: 'January',
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Feb: 'February',
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Mar: 'March',
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Apr: 'April',
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May: 'May',
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Jun: 'June',
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Jul: 'July',
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Aug: 'August',
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Sep: 'September',
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Oct: 'October',
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Nov: 'November',
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Dec: 'December',
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};
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const fullDay = days[dayAbbr] || dayAbbr;
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const fullMonth = months[monthAbbr] || monthAbbr;
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// Convert to 12-hour format manually
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let hours = parseInt(hoursStr, 10);
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const ampm = hours >= 12 ? 'PM' : 'AM';
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hours = hours % 12;
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hours = hours ? hours : 12; // the hour '0' should be '12'
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// Format timezone: +0200 -> UTC+02:00
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const tzSign = timezone.substring(0, 1);
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const tzHours = timezone.substring(1, 3);
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const tzMins = timezone.substring(3, 5);
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const formattedTz = `UTC${tzSign}${tzHours}:${tzMins}`;
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return `${fullDay}, ${fullMonth} ${dom}, ${year} at ${hours}:${minsStr} ${ampm} (${formattedTz})`;
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}
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} catch (e) {
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// Fallback to raw string if parsing fails
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}
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return raw;
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}
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/**
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* Replace CID references in HTML with base64 data URIs
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*/
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function processInlineImages(
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html: string,
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attachments: EmailAttachment[]
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): string {
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if (!html) return html;
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// Create a map of contentIds to attachments
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const cidMap = new Map<string, EmailAttachment>();
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attachments.forEach((att) => {
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if (att.contentId) {
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cidMap.set(att.contentId, att);
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}
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});
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// Replace src="cid:..."
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return html.replace(/src=["']cid:([^"']+)["']/g, (match, cid) => {
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const att = cidMap.get(cid);
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if (att && att.content) {
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// Convert Uint8Array to base64
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let binary = '';
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const len = att.content.byteLength;
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for (let i = 0; i < len; i++) {
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binary += String.fromCharCode(att.content[i]);
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}
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const base64 =
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typeof btoa === 'function'
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? btoa(binary)
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: Buffer.from(binary, 'binary').toString('base64');
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return `src="data:${att.contentType};base64,${base64}"`;
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}
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return match; // Keep original if not found
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});
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}
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export function renderEmailToHtml(
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email: ParsedEmail,
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options: EmailRenderOptions = {}
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): string {
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const { includeCcBcc = true, includeAttachments = true } = options;
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let processedHtml = '';
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if (email.htmlBody) {
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processedHtml = processInlineImages(email.htmlBody, email.attachments);
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} else {
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processedHtml = `<pre style="white-space: pre-wrap; font-family: inherit; margin: 0;">${escapeHtml(email.textBody)}</pre>`;
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}
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// Format date in a human-readable way
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let dateStr = 'Unknown Date';
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if (email.rawDateString) {
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dateStr = formatRawDate(email.rawDateString);
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} else if (email.date && !isNaN(email.date.getTime())) {
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dateStr = email.date.toLocaleString('en-US', {
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weekday: 'long',
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year: 'numeric',
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month: 'long',
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day: 'numeric',
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hour: 'numeric',
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minute: '2-digit',
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hour12: true,
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});
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}
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const attachmentHtml =
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includeAttachments && email.attachments.length > 0
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? `
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<div style="margin-top: 20px; padding-top: 15px; border-top: 1px solid #cccccc;">
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<p style="margin: 0 0 8px 0; font-size: 11px; color: #666; font-weight: 600;">Attachments (${email.attachments.length})</p>
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<ul style="margin: 0; padding-left: 20px; font-size: 10px; color: #555;">
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${email.attachments
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.map(
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(att) =>
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`<li style="margin-bottom: 5px;">${escapeHtml(att.filename)} <span style="color: #999;">(${formatBytes(att.size)})</span></li>`
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)
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.join('')}
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</ul>
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</div>
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`
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: '';
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// Build CC/BCC rows
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let ccBccHtml = '';
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if (includeCcBcc) {
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if (email.cc.length > 0) {
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ccBccHtml += `
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<div style="margin-bottom: 8px;">
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<span style="font-weight: 600; color: #666; margin-right: 8px;">CC:</span>
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<span style="color: #333;">${escapeHtml(email.cc.join(', '))}</span>
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</div>`;
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}
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if (email.bcc.length > 0) {
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ccBccHtml += `
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<div style="margin-bottom: 8px;">
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<span style="font-weight: 600; color: #666; margin-right: 8px;">BCC:</span>
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<span style="color: #333;">${escapeHtml(email.bcc.join(', '))}</span>
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</div>`;
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}
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}
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return `<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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</head>
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<body style="font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; line-height: 1.6; color: #333; max-width: 800px; margin: 0 auto; padding: 40px 20px; background: #fff;">
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<div style="border-bottom: 2px solid #999999; padding-bottom: 20px; margin-bottom: 30px;">
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<h1 style="font-size: 18px; font-weight: 600; color: #1a1a1a; margin: 0 0 12px 0;">${escapeHtml(email.subject)}</h1>
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<div style="font-size: 12px; color: #555;">
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<div style="margin-bottom: 8px;">
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<span style="font-weight: 600; color: #666; margin-right: 8px;">From:</span>
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<span style="color: #333;">${escapeHtml(email.from)}</span>
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</div>
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<div style="margin-bottom: 8px;">
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<span style="font-weight: 600; color: #666; margin-right: 8px;">To:</span>
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<span style="color: #333;">${escapeHtml(email.to.join(', ') || 'Unknown')}</span>
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</div>
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${ccBccHtml}
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<div style="margin-bottom: 8px;">
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<span style="font-weight: 600; color: #666; margin-right: 8px;">Date:</span>
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<span style="color: #333;">${escapeHtml(dateStr)}</span>
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</div>
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</div>
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</div>
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<div style="font-size: 12px; color: #333;">
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${processedHtml}
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</div>
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${attachmentHtml}
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</body>
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</html>`;
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}
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export async function parseEmailFile(file: File): Promise<ParsedEmail> {
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const ext = file.name.toLowerCase().split('.').pop();
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if (ext === 'eml') {
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return parseEmlFile(file);
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} else if (ext === 'msg') {
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return parseMsgFile(file);
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} else {
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throw new Error(`Unsupported file type: .${ext}`);
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}
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}
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