2026-05-15 11:02:22 +02:00
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import 'dart:convert';
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import 'package:enough_mail/enough_mail.dart' as imap;
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import 'package:flutter_test/flutter_test.dart';
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import 'package:sharedinbox/core/utils/cid_utils.dart';
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// A minimal multipart/related email with one embedded PNG referenced via cid:.
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//
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// The image data is the 1×1 red pixel PNG (67 bytes) from RFC-tests tradition.
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const _kPixelPng =
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'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8z8BQDwADhQGAWjR9awAAAABJRU5ErkJggg==';
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// Build a synthetic RFC 2822 multipart/related message.
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String _buildRelatedMime({String cidHost = 'test@example.com'}) {
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const boundary = '----=_Part_TEST_BOUNDARY';
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const innerBoundary = '----=_Part_INNER_BOUNDARY';
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return [
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'MIME-Version: 1.0',
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'Content-Type: multipart/related;',
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'\ttype="multipart/alternative";',
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'\tboundary="$boundary"',
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'',
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'--$boundary',
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'Content-Type: multipart/alternative;',
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'\tboundary="$innerBoundary"',
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'',
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'--$innerBoundary',
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'Content-Type: text/plain; charset=UTF-8',
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'',
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'See the image below.',
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'--$innerBoundary',
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'Content-Type: text/html; charset=UTF-8',
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'',
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'<html><body><img src="cid:$cidHost"></body></html>',
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'--$innerBoundary--',
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'',
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'--$boundary',
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'Content-Type: image/png',
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'Content-Disposition: inline',
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'Content-Transfer-Encoding: base64',
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'Content-ID: <$cidHost>',
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'',
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_kPixelPng,
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'--$boundary--',
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].join('\r\n');
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}
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void main() {
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group('injectInlineImages', () {
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test('replaces cid: reference with data: URI', () {
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final msg = imap.MimeMessage.parseFromText(_buildRelatedMime());
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const html = '<img src="cid:test@example.com">';
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final result = injectInlineImages(html, msg);
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expect(result, contains('src="data:image/png;base64,'));
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expect(result, isNot(contains('cid:')));
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});
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test('leaves HTML unchanged when there are no inline parts', () {
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// A plain text-only message.
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2026-06-02 17:10:16 +02:00
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const plainMime = 'MIME-Version: 1.0\r\n'
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2026-05-15 11:02:22 +02:00
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'Content-Type: text/plain\r\n'
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'\r\n'
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'Hello';
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final msg = imap.MimeMessage.parseFromText(plainMime);
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const html = '<img src="cid:foo@bar">';
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expect(injectInlineImages(html, msg), html);
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});
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test('handles single-quoted src attribute', () {
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final msg = imap.MimeMessage.parseFromText(_buildRelatedMime());
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const html = "<img src='cid:test@example.com'>";
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final result = injectInlineImages(html, msg);
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expect(result, contains("src='data:image/png;base64,"));
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expect(result, isNot(contains('cid:')));
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});
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test('embedded data is the same base64 as the MIME part', () {
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final msg = imap.MimeMessage.parseFromText(_buildRelatedMime());
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const html = '<img src="cid:test@example.com">';
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final result = injectInlineImages(html, msg);
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// Extract base64 payload from the data URI.
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2026-06-02 11:10:29 +02:00
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final match = RegExp(
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r'data:image/png;base64,([A-Za-z0-9+/=]+)',
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).firstMatch(result);
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2026-05-15 11:02:22 +02:00
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expect(match, isNotNull);
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final decoded = base64.decode(match!.group(1)!);
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expect(decoded.length, greaterThan(0));
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});
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});
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}
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