MailJDTourDownloadDocsQualityTestsCoverage

Which source lines and branches the tests execute. Lines 91.5 %, branches 75.0 % (minimum 85 % and 72 %). main @ 399ffe3d · 21 October 2026 · pipeline 7238.

GCC Code Coverage Report

Directory: src/
Coverage: low: ≥ 0% medium: ≥ 75.0% high: ≥ 90.0%
Coverage Exec / Excl / Total
Lines: 98.0% 450 / 0 / 459
Functions: 100.0% 32 / 0 / 32
Branches: 88.4% 772 / 0 / 873
service/Rfc2822Builder.cpp
Line Branch Exec Source
1 #include "Rfc2822Builder.h"
2
3 #include <QFile>
4 #include <QFileInfo>
5 #include <QRegularExpression>
6 #include <QLocale>
7 #include <QMimeDatabase>
8 #include <QUrl>
9 #include <QUuid>
10
11 #include <utility>
12
13 namespace {
14
15 // A header value without CR, LF (header injection, T-400/T-509) and NUL
16 // (RFC 5322 §2.2, S106-030), as UTF-8.
17 1988 QByteArray headerSafe(const QString &value) {
18 1988 QString safe = value;
19
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 1988 safe.remove(QLatin1Char('\r'));
20
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 1988 safe.remove(QLatin1Char('\n'));
21
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 1988 safe.remove(QChar::Null);
22
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 3976 return safe.toUtf8();
23 1988 }
24
25 // A message id from another mail (In-Reply-To, References) as written into
26 // ours: visible ASCII only (RFC 5322 msg-id) and at most 900 bytes, so an
27 // untrusted original cannot make a header line exceed 998 bytes
28 // (Sprint 108, fuzz_rfc2822_builder). Whitespace splits ids.
29 // The Content-Type of a leaf part (an attachment, an inline image): a
30 // plain type/subtype token pair. Anything else — header injection (T-614),
31 // parameters, or a container type (multipart/*, message/*) that would make
32 // a reader parse the file's bytes as MIME — becomes
33 // application/octet-stream (Sprint 108, fuzz_rfc2822_builder).
34 66 QByteArray leafMimeType(const QByteArray &mimeType) {
35
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 77 static const QRegularExpression token(QStringLiteral("^[a-z0-9][a-z0-9!#$&^_.+-]{0,63}/[a-z0-9][a-z0-9!#$&^_.+-]{0,126}$"));
36
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 66 const QString type = QString::fromLatin1(mimeType).trimmed().toLower();
37
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 194 if (!token.match(type).hasMatch() || type.startsWith(QLatin1String("multipart/")) ||
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 128 type.startsWith(QLatin1String("message/")))
39 4 return QByteArrayLiteral("application/octet-stream");
40
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 62 return type.toLatin1();
41 66 }
42
43 622 QByteArrayList messageIdsSafe(const QString &value) {
44 622 QByteArrayList ids;
45
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 1247 for (const QByteArray &token : headerSafe(value).split(' ')) {
46 625 QByteArray id;
47
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 15076 for (const char c : token)
48
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 14451 if (c > 0x20 && c < 0x7f) id.append(c);
49
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 625 if (!id.isEmpty()) ids.append(id.left(900));
50 1247 }
51 622 return ids;
52 ✗ }
53
54 QByteArray foldHeader(const QByteArray &name, const QByteArray &value);
55
56 132 QByteArray encodeMimeFilenameParameters(const QByteArray &parameter,
57 const QString &filename) {
58 132 QString sanitized = filename;
59
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 132 sanitized.remove(QLatin1Char('\r'));
60
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 132 sanitized.remove(QLatin1Char('\n'));
61
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 132 sanitized.remove(QChar::Null);
62
63 132 QByteArray fallback;
64
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 2362 for (const QChar character : sanitized) {
65 2230 const ushort code = character.unicode();
66
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 2230 if (code >= 0x20 && code <= 0x7e && code != '"' && code != '\\')
67
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 2042 fallback.append(static_cast<char>(code));
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 188 else if (code == '"')
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 4 fallback.append('\'');
70 else
71
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 184 fallback.append('_');
72
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 2230 if (fallback.size() >= 120)
73 ✗ break;
74 }
75
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 132 if (fallback.isEmpty())
76
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 4 fallback = "attachment";
77
78
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 132 QByteArray result = " " + parameter + "=\"" + fallback + "\"";
79 132 const QByteArray encoded = QUrl::toPercentEncoding(
80
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 132 sanitized, QByteArrayLiteral("!#$&+-.^_`|~"));
81
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 382 const bool needsExtended = sanitized.toUtf8() != fallback ||
82
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 250 encoded.size() > 60;
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 132 if (!needsExtended)
84 118 return result;
85
86
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 14 if (encoded.size() <= 60) {
87
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 8 result += ";\r\n " + parameter + "*=UTF-8''" + encoded;
88 8 return result;
89 }
90
91 6 qsizetype position = 0;
92 6 int section = 0;
93
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 40 while (position < encoded.size()) {
94 34 qsizetype end = qMin<qsizetype>(position + 48, encoded.size());
95
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 142 while (end > position &&
96 50 (encoded.at(end - 1) == '%' ||
97
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 42 (end - position >= 2 && encoded.at(end - 2) == '%'))) {
98 16 --end;
99 }
100
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 34 if (end == position)
101 ✗ end = qMin<qsizetype>(position + 3, encoded.size());
102 const QByteArray prefix =
103
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 34 section == 0 ? QByteArrayLiteral("UTF-8''") : QByteArray();
104
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 68 result += ";\r\n " + parameter + "*" + QByteArray::number(section) +
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 102 "*=" + prefix + encoded.mid(position, end - position);
106 34 position = end;
107 34 ++section;
108 34 }
109 6 return result;
110 132 }
111
112 } // namespace
113
114 // ═══════════════════════════════════════════════════════
115 // Header setters
116 // ═══════════════════════════════════════════════════════
117
118 403 void Rfc2822Builder::setFrom(const QString &name, const QString &email) {
119 403 m_fromName = name;
120 403 m_fromEmail = email;
121 403 }
122
123 392 void Rfc2822Builder::setTo(const QStringList &recipients) {
124 392 m_to = recipients;
125 392 }
126
127 80 void Rfc2822Builder::setCc(const QStringList &cc) { m_cc = cc; }
128
129 75 void Rfc2822Builder::setBcc(const QStringList &bcc) { m_bcc = bcc; }
130
131 393 void Rfc2822Builder::setSubject(const QString &subject) {
132 393 m_subject = subject;
133 393 }
134
135 283 void Rfc2822Builder::setDate(const QDateTime &date) { m_date = date; }
136
137 361 void Rfc2822Builder::setMessageId(const QString &messageId) {
138 361 m_messageId = messageId;
139 361 }
140
141 61 void Rfc2822Builder::setInReplyTo(const QString &messageId) {
142 61 m_inReplyTo = messageId;
143 61 }
144
145 59 void Rfc2822Builder::setReferences(const QStringList &messageIds) {
146 59 m_references = messageIds;
147 59 }
148
149 396 void Rfc2822Builder::setBodyText(const QString &plainText) {
150 396 m_bodyText = plainText;
151 396 }
152
153 52 void Rfc2822Builder::addAttachment(const Attachment &attachment) {
154 52 m_attachments.append(attachment);
155 52 }
156
157 4 bool Rfc2822Builder::addAttachmentFromFile(const QString &filePath,
158 qint64 maxBytes,
159 qint64 *loadedBytes) {
160
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 4 if (loadedBytes) *loadedBytes = 0;
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 4 const qint64 onDisk = QFileInfo(filePath).size();
162
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 4 if (maxBytes < 0 || maxBytes > MaxAttachmentBytes ||
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 4 onDisk < 0 || onDisk > maxBytes)
164 2 return false;
165
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 2 QFile file(filePath);
166 // T-622/FUNC-07: Return false if file cannot be opened
167
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 2 if (!file.open(QIODevice::ReadOnly))
168 ✗ return false;
169
170 2 Attachment att;
171
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 2 att.filename = QFileInfo(filePath).fileName();
172 // The file can grow after the stat. Bound the read itself and reject any
173 // changed-length snapshot before encoding or retaining attachment bytes.
174
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 2 att.data = file.read(onDisk + 1);
175
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 6 if (file.error() != QFile::NoError || att.data.size() != onDisk ||
176
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 6 att.data.size() > maxBytes || file.size() != onDisk || !file.atEnd())
177 ✗ return false;
178
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 2 att.mimeType = mimeTypeForFile(filePath, att.data.left(4096));
179 2 const qint64 actualBytes = att.data.size();
180
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 2 m_attachments.append(std::move(att));
181
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 2 if (loadedBytes) *loadedBytes = actualBytes;
182 2 return true;
183 2 }
184
185 85 QByteArray Rfc2822Builder::mimeTypeForFile(const QString &filePath, const QByteArray &head) {
186
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 85 static const QMimeDatabase database;
187
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 85 const QMimeType byName = database.mimeTypeForFile(filePath, QMimeDatabase::MatchExtension);
188
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 85 const QMimeType type = head.isEmpty() ? byName : database.mimeTypeForFileNameAndData(filePath, head);
189
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 85 QByteArray name = type.isValid() ? type.name().toLatin1() : QByteArray();
190 // Only a plain type/subtype token reaches the header.
191
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 93 static const QRegularExpression token(QStringLiteral("^[a-z0-9][a-z0-9!#$&^_.+-]*/[a-z0-9][a-z0-9!#$&^_.+-]*$"));
192
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 170 if (name.isEmpty() || name == "application/x-zerosize" || !token.match(QString::fromLatin1(name)).hasMatch())
193 ✗ return QByteArrayLiteral("application/octet-stream");
194 85 return name;
195 85 }
196
197 12 void Rfc2822Builder::setMailJdHeader(const QString &name, const QString &value) {
198
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 16 static const QRegularExpression valid(QStringLiteral("^X-MailJD-[A-Za-z0-9-]{1,40}$"));
199
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 12 if (!valid.match(name).hasMatch()) return;
200
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 11 m_mailJdHeaders.append({name.toLatin1(), value});
201 }
202
203 // ═══════════════════════════════════════════════════════
204 // RFC 2047: Header encoding for non-ASCII
205 // ═══════════════════════════════════════════════════════
206
207 1220 QByteArray Rfc2822Builder::encodeHeader(const QString &value) {
208
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 1220 QByteArray utf8 = value.toUtf8();
209
210 // T-400/Bug 4: Always strip CR/LF to prevent header injection; S106-030:
211 // and NUL, which RFC 5322 §2.2 forbids in header fields.
212
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 1220 utf8.replace('\r', "");
213
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 1220 utf8.replace('\n', "");
214
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 1220 utf8.replace('\0', "");
215
216 // Check if encoding is needed: any non-ASCII, or a token folding cannot
217 // break (folding happens only at whitespace; a longer run made a header
218 // line above RFC 5322's 998 bytes — encoded words split anywhere).
219 1220 bool needsEncoding = false;
220 1220 qsizetype run = 0;
221
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 21233 for (char c : utf8) {
222
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 20120 if (static_cast<unsigned char>(c) > 127) {
223 106 needsEncoding = true;
224 106 break;
225 }
226
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 20014 run = (c == ' ' || c == '\t') ? 0 : run + 1;
227
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 20014 if (run > kMaxUnfoldableToken) {
228 1 needsEncoding = true;
229 1 break;
230 }
231 }
232
233
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 1220 if (!needsEncoding)
234 1113 return utf8;
235
236 // RFC 2047 Base64 encoded-word: =?UTF-8?B?<base64>?=
237 // Split into chunks if needed (max 75 chars per encoded-word)
238 107 QByteArray encoded;
239
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 107 const QByteArray prefix = "=?UTF-8?B?";
240
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 107 const QByteArray suffix = "?=";
241 // Max base64 payload to fit in 75 chars: 75 - prefix.size() - suffix.size()
242 107 const int maxPayloadBytes = ((75 - prefix.size() - suffix.size()) / 4) * 3;
243
244 107 int pos = 0;
245
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 256 while (pos < utf8.size()) {
246 // Find a chunk boundary that doesn't split a UTF-8 multibyte sequence
247 149 int chunkEnd = qMin(pos + maxPayloadBytes, utf8.size());
248 // Don't split in the middle of a UTF-8 multibyte char
249
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 197 while (chunkEnd < utf8.size() && chunkEnd > pos &&
250
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 45 (static_cast<unsigned char>(utf8[chunkEnd]) & 0xC0) == 0x80) {
251 3 --chunkEnd;
252 }
253
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 149 if (chunkEnd <= pos)
254 ✗ chunkEnd = qMin(pos + maxPayloadBytes, utf8.size());
255
256
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 149 QByteArray chunk = utf8.mid(pos, chunkEnd - pos);
257
258
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 149 if (!encoded.isEmpty())
259
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 42 encoded += "\r\n "; // Folding whitespace between encoded-words
260
261
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 149 encoded += prefix + chunk.toBase64() + suffix;
262 149 pos = chunkEnd;
263 149 }
264
265 107 return encoded;
266 1220 }
267
268 795 QByteArray Rfc2822Builder::encodeAddress(const QString &name,
269 const QString &email) {
270 // T-400/Bug 4: Sanitize CRLF (and NUL, S106-030) from email to prevent
271 // header injection
272
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 795 const QByteArray safeEmail = headerSafe(email).left(254); // RFC 5321 path limit (fuzz_rfc2822_builder)
273
274
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 795 if (name.isEmpty())
275 17 return safeEmail;
276
277
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 778 auto encodedName = encodeHeader(name);
278 // ASCII phrase punctuation needs a quoted display name. Encoded words for
279 // international names already carry their own RFC 2047 representation.
280 // F-14 (SPRINT-104): ':' is group syntax in an unquoted phrase
281 // ("Support: Team <s@x.org>" parses as a group named "Support"), so it
282 // joins the specials that force quoting.
283 // S106-029: whether encoding happened is decided by the name, not by the
284 // result's first bytes — an ASCII name starting with "=?" was emitted
285 // unquoted (and a literal "=?…?=" would even be decoded as an encoded
286 // word), so ASCII names containing "=?" are quoted too.
287
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 778 const bool encodedWords = encodedName != name.toUtf8();
288
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 1513 if (!encodedWords && (encodedName.contains(',') || encodedName.contains(';') ||
289
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 735 encodedName.contains('"') || encodedName.contains('\\') || encodedName.contains('<') ||
290
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 735 encodedName.contains('>') || encodedName.contains('(') || encodedName.contains(')') ||
291
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 1513 encodedName.contains(':') || encodedName.contains("=?"))) {
292
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 8 encodedName.replace("\\", "\\\\");
293
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 8 encodedName.replace("\"", "\\\"");
294
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 8 encodedName = "\"" + encodedName + "\"";
295 }
296
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 778 return encodedName + " <" + safeEmail + ">";
297 795 }
298
299 461 QByteArray Rfc2822Builder::encodeAddressList(const QStringList &addresses) {
300 // Each address can be "name <email>" or just "email"
301 // Parse and re-encode each
302 461 QByteArray result;
303
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 976 for (const QString &addr : addresses) {
304
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 515 if (!result.isEmpty())
305
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 55 result += ",\r\n ";
306
307
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 515 QString trimmed = addr.trimmed();
308 // F-14 (SPRINT-104): a quoted display name may itself contain '<'
309 // ("Doe, John <CEO>" <j@x.org>) — take the LAST '<' as the address
310 // opener, and strip exactly one enclosing quote pair from the name.
311 515 int ltIdx = trimmed.lastIndexOf('<');
312 515 int gtIdx = trimmed.indexOf('>', ltIdx);
313
314
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 515 if (ltIdx > 0 && gtIdx > ltIdx) {
315 // "Display Name <email>"
316
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 367 QString name = trimmed.left(ltIdx).trimmed();
317 // Remove surrounding quotes if present
318
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 367 if (name.size() >= 2 && name.startsWith('"') && name.endsWith('"'))
319
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 5 name = name.mid(1, name.size() - 2);
320
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 367 QString email = trimmed.mid(ltIdx + 1, gtIdx - ltIdx - 1).trimmed();
321 // S106-031: one address with a long ASCII name is folded at its
322 // spaces (FWS is allowed inside a quoted display name).
323
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 367 result += foldHeader("To:", encodeAddress(name, email));
324 367 } else {
325 // Plain email address — T-509: sanitize CRLF (and NUL) to prevent
326 // header injection. Sprint 108 (fuzz_rfc2822_builder): an address
327 // has at most 254 bytes (RFC 5321 §4.5.3.1.3); anything longer is not
328 // one and must not make a header line exceed 998 bytes.
329
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 148 result += headerSafe(trimmed).left(254);
330 }
331 515 }
332 461 return result;
333 ✗ }
334
335 // ═══════════════════════════════════════════════════════
336 // Quoted-Printable encoding (RFC 2045)
337 // ═══════════════════════════════════════════════════════
338
339 461 QByteArray Rfc2822Builder::encodeQuotedPrintable(const QByteArray &data) {
340 461 QByteArray result;
341 461 int lineLen = 0;
342
343
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 47537 for (int i = 0; i < data.size(); ++i) {
344 47076 unsigned char c = static_cast<unsigned char>(data[i]);
345
346 // Handle CRLF pass-through
347
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 47076 if (c == '\r' && i + 1 < data.size() && data[i + 1] == '\n') {
348
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 4 result += "\r\n";
349 4 lineLen = 0;
350 4 ++i; // Skip the \n
351 696 continue;
352 }
353
354 // Handle bare LF → CRLF
355
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 47072 if (c == '\n') {
356
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 692 result += "\r\n";
357 692 lineLen = 0;
358 692 continue;
359 }
360
361 46380 QByteArray encoded;
362 // Printable ASCII (33-126) except '=' can be literal
363
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 46380 if ((c >= 33 && c <= 126 && c != '=') || c == '\t' || c == ' ') {
364 // Space/tab at end of line must be encoded
365 bool atEol =
366
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 90413 (i + 1 >= data.size()) ||
367
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 180431 (i + 1 < data.size() && data[i + 1] == '\r') ||
368
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 90018 (i + 1 < data.size() && data[i + 1] == '\n');
369
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 45400 if ((c == ' ' || c == '\t') && atEol) {
370
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 28 encoded = "=" + QByteArray::number(c, 16).toUpper().rightJustified(2, '0');
371 } else {
372
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 45372 encoded += static_cast<char>(c);
373 }
374 45400 } else {
375
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 980 encoded = "=" + QByteArray::number(c, 16).toUpper().rightJustified(2, '0');
376 }
377
378 // Soft line break if line would exceed 76 chars
379
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 46380 if (lineLen + encoded.size() > 75) {
380
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 364 result += "=\r\n";
381 364 lineLen = 0;
382 }
383
384
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 46380 result += encoded;
385 46380 lineLen += encoded.size();
386 46380 }
387
388 461 return result;
389 ✗ }
390
391 // ═══════════════════════════════════════════════════════
392 // Message-ID and boundary generation
393 // ═══════════════════════════════════════════════════════
394
395 115 QByteArray Rfc2822Builder::generateMessageId(const QString &senderAddress) {
396
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 115 const QByteArray uuid = QUuid::createUuid().toString(QUuid::WithoutBraces).remove('-').toLatin1();
397 115 const int at = senderAddress.lastIndexOf(QLatin1Char('@'));
398
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 115 QByteArray domain = at > 0 ? QUrl::toAce(senderAddress.mid(at + 1)).toLower() : QByteArray();
399
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 115 if (domain.endsWith('.')) domain.chop(1);
400 34 static const QRegularExpression validDomain(QStringLiteral(
401
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 149 "^[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?(?:\\.[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?)*$"));
402
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 230 if (domain.size() > 253 || !validDomain.match(QString::fromLatin1(domain)).hasMatch())
403
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 4 domain = "mailjd.invalid";
404
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 230 return '<' + uuid + '@' + domain + '>';
405 115 }
406
407 109 QByteArray Rfc2822Builder::generateBoundary() const {
408
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 109 if (!m_boundarySeed.isEmpty())
409
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 20 return "----=_Part_" + m_boundarySeed + '_' + QByteArray::number(++m_boundaryCounter);
410 return "----=_Part_" +
411
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 89 QUuid::createUuid()
412
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 89 .toString(QUuid::WithoutBraces)
413
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 178 .remove('-')
414
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 178 .toLatin1();
415 }
416
417 // ═══════════════════════════════════════════════════════
418 // Build the complete RFC-2822 message
419 // ═══════════════════════════════════════════════════════
420
421 25 void Rfc2822Builder::setCalendarPart(const QByteArray &calendar, const QString &method) {
422 25 m_calendar = calendar;
423 // A header parameter: only the iTIP method token survives.
424 25 m_calendarMethod.clear();
425
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 196 for (const QChar c : method.toUpper())
426
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 196 if ((c >= QLatin1Char('A') && c <= QLatin1Char('Z')) || c == QLatin1Char('-')) m_calendarMethod += char(c.unicode());
427 25 }
428
429 32 QString Rfc2822Builder::messageIdOf(const QByteArray &message) {
430
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 32 const QByteArray headers = message.left(message.indexOf("\r\n\r\n"));
431
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 151 for (const QByteArray &line : headers.split('\n'))
432
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 151 if (line.toLower().startsWith("message-id:")) return QString::fromLatin1(line.mid(11).trimmed());
433 1 return {};
434 32 }
435
436 namespace {
437 // F-15 (SPRINT-104): fold an unstructured header value onto continuation
438 // lines at word boundaries. The first line keeps the "Name:" prefix
439 // within 78 characters where possible; every emitted line stays below
440 // the 998-byte hard limit. Values without spaces long enough to matter
441 // (encoded words without whitespace are one token) are left untouched
442 // rather than split mid-token.
443 1347 QByteArray foldHeader(const QByteArray &name, const QByteArray &value) {
444
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 1347 const QByteArray prefix = name + " ";
445
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 1347 if (prefix.size() + value.size() <= 78)
446 1309 return value;
447 // S106-026: encodeHeader already folds its encoded words ("\r\n " between
448 // words of at most 75 characters). Folding that again at the join's space
449 // emitted "\r\n" twice in a row — an empty line that ended the header
450 // block, so Message-ID, References and Content-Type became body text.
451
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 38 if (value.contains("\r\n"))
452 9 return value;
453 29 QByteArray result;
454 29 qsizetype lineStart = 0; // offset into value where the current line begins
455 29 qsizetype search = 0;
456 29 qsizetype lastSpace = -1;
457 29 const qsizetype firstBudget = 78 - prefix.size();
458 29 qsizetype budget = firstBudget;
459
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 13801 for (qsizetype i = 0; i < value.size(); ++i) {
460 // Both WSP characters are fold points, as encodeHeader assumes when it
461 // leaves a value unencoded (a tab-separated run once stayed one line
462 // of 1 210 bytes — fuzz_rfc2822_builder, pipeline #7214).
463
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 13772 if (value.at(i) == ' ' || value.at(i) == '\t')
464 176 lastSpace = i;
465
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 13772 if (i - lineStart >= budget && lastSpace > lineStart) {
466 // The whitespace starts the continuation line: unfolding (removing
467 // the CRLF) gives the value back unchanged.
468
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 128 result += value.mid(lineStart, lastSpace - lineStart) + "\r\n";
469 128 lineStart = lastSpace;
470 128 i = lineStart;
471 128 lastSpace = -1;
472 128 budget = 78; // the continuation line's leading whitespace included
473 }
474 }
475
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 29 result += value.mid(lineStart);
476 // A single token longer than the budget stays on its own line; values
477 // from encodeHeader never carry one above kMaxUnfoldableToken.
478 29 return result;
479 1347 }
480 } // namespace
481
482 423 QByteArray Rfc2822Builder::build(BccHeader bccHeader) const {
483 423 QByteArray msg;
484 423 m_boundaryCounter = 0;
485
486 // Date header — required
487
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 423 QDateTime date = m_date.isValid() ? m_date : QDateTime::currentDateTimeUtc();
488 // T-400/Bug 15: Use C locale for RFC 5322 compliant English date names
489 423 msg += "Date: " +
490
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 1269 QLocale(QLocale::C).toString(date, QStringLiteral("ddd, dd MMM yyyy HH:mm:ss")).toUtf8();
491
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 423 int utcOffset = date.offsetFromUtc();
492
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 423 if (utcOffset == 0) {
493
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 393 msg += " +0000";
494 } else {
495 30 int hours = qAbs(utcOffset) / 3600;
496 30 int mins = (qAbs(utcOffset) % 3600) / 60;
497
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 30 msg += (utcOffset > 0 ? " +" : " -");
498
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 30 msg += QByteArray::number(hours).rightJustified(2, '0');
499
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 30 msg += QByteArray::number(mins).rightJustified(2, '0');
500 }
501
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 423 msg += "\r\n";
502
503 // From
504
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 423 if (!m_fromEmail.isEmpty()) {
505
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 423 msg += "From: " + foldHeader("From:", encodeAddress(m_fromName, m_fromEmail)) + "\r\n";
506 }
507
508 // To
509
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 423 if (!m_to.isEmpty()) {
510
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 407 msg += "To: " + encodeAddressList(m_to) + "\r\n";
511 }
512
513 // Cc
514
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 423 if (!m_cc.isEmpty()) {
515
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 24 msg += "Cc: " + encodeAddressList(m_cc) + "\r\n";
516 }
517
518 // Bcc is a required per-build choice: private IMAP copies include it, SMTP omits it.
519
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 423 if (!m_bcc.isEmpty() && bccHeader == BccHeader::Include) {
520
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 12 msg += "Bcc: " + encodeAddressList(m_bcc) + "\r\n";
521 }
522
523 // Subject — RFC 2047 encoded if non-ASCII
524 // F-15 (SPRINT-104): fold at whitespace so no header line exceeds the
525 // 998-byte transport limit (RFC 5322 §2.1.1). Encoded words carry no
526 // spaces and are never split; a 1200-character ASCII subject used to
527 // leave as one 1210-byte line.
528
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 423 msg += "Subject: " + foldHeader("Subject:", encodeHeader(m_subject)) + "\r\n";
529
530 // Message-ID — T-509: sanitize CRLF to prevent header injection
531
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 423 if (m_messageId.isEmpty())
532
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 115 m_messageId = QString::fromUtf8(generateMessageId(m_fromEmail));
533
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 423 msg += "Message-ID: " + headerSafe(m_messageId) + "\r\n";
534
535 // In-Reply-To — T-400/Bug 4: sanitized; S106-031: folded like Subject.
536
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 423 if (const QByteArrayList ids = messageIdsSafe(m_inReplyTo); !ids.isEmpty())
537
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 423 msg += "In-Reply-To: " + foldHeader("In-Reply-To:", ids.join(' ')) + "\r\n";
538
539 // References — S106-031: a long thread's ids (~21 already pass the
540 // 998-byte line limit of RFC 5322 §2.1.1) fold between the ids.
541
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 423 if (!m_references.isEmpty()) {
542 60 QByteArrayList safeRefs;
543
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 259 for (const QString &ref : m_references) safeRefs.append(messageIdsSafe(ref));
544
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 60 if (!safeRefs.isEmpty()) msg += "References: " + foldHeader("References:", safeRefs.join(' ')) + "\r\n";
545 60 }
546
547 // Sprint 108 optional headers (absent unless set: plain builds unchanged).
548
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 423 if (!m_replyTo.isEmpty())
549
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 6 msg += "Reply-To: " + encodeAddressList(m_replyTo) + "\r\n";
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 423 if (m_priority == 1 || m_priority == 2)
551
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 5 msg += "Importance: high\r\nX-Priority: 1 (Highest)\r\n";
552
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 418 else if (m_priority == 4 || m_priority == 5)
553
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 1 msg += "Importance: low\r\nX-Priority: 5 (Lowest)\r\n";
554
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 423 if (!m_dispositionNotificationTo.isEmpty())
555
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 12 msg += "Disposition-Notification-To: " + encodeAddressList({m_dispositionNotificationTo}) + "\r\n";
556
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 435 for (const auto &header : m_mailJdHeaders)
557
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 12 msg += header.first + ": " + foldHeader(header.first + ':', encodeHeader(header.second)) + "\r\n";
558
559 // MIME-Version
560
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 423 msg += "MIME-Version: 1.0\r\n";
561
562
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 423 if (!m_bodyHtml.isNull()) {
563
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 31 appendFormattedBody(msg);
564 31 return msg;
565 }
566
567 // Body + optional attachments
568
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 392 if (m_attachments.isEmpty() && !m_calendar.isEmpty()) {
569
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 23 const QByteArray boundary = generateBoundary();
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 23 msg += "Content-Type: multipart/alternative;\r\n boundary=\"" + boundary + "\"\r\n\r\n";
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 23 msg += "--" + boundary + "\r\n";
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 23 msg += "Content-Type: text/plain; charset=UTF-8\r\n";
573
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 23 msg += "Content-Transfer-Encoding: quoted-printable\r\n\r\n";
574
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 23 msg += encodeQuotedPrintable(m_bodyText.toUtf8()) + "\r\n";
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 23 msg += "--" + boundary + "\r\n";
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 23 msg += "Content-Type: text/calendar; method=" + m_calendarMethod + "; charset=UTF-8\r\n";
577
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 23 msg += "Content-Transfer-Encoding: base64\r\n\r\n";
578
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 23 const QByteArray encoded = m_calendar.toBase64();
579
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 211 for (qsizetype offset = 0; offset < encoded.size(); offset += 76)
580
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 188 msg += encoded.mid(offset, 76) + "\r\n";
581
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 23 msg += "--" + boundary + "--\r\n";
582
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 392 } else if (m_attachments.isEmpty()) {
583 // Simple text message
584
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 328 msg += "Content-Type: text/plain; charset=UTF-8\r\n";
585
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 328 msg += "Content-Transfer-Encoding: quoted-printable\r\n";
586
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 328 msg += "\r\n";
587
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 328 msg += encodeQuotedPrintable(m_bodyText.toUtf8());
588 } else {
589 // Multipart/mixed
590
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 41 QByteArray boundary = generateBoundary();
591
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 82 msg += "Content-Type: multipart/mixed;\r\n boundary=\"" + boundary +
592
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 41 "\"\r\n";
593
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 41 msg += "\r\n";
594
595 // F-17 (SPRINT-104): with a calendar part, the text body becomes a
596 // multipart/alternative of text and text/calendar (RFC 2045 §5.1.4
597 // nesting) inside the mixed container — latent before: no caller
598 // combined both, but the builder silently dropped the invitation
599 // part when one did.
600
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 41 if (!m_calendar.isEmpty()) {
601
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 3 const QByteArray inner = generateBoundary();
602
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 3 msg += "--" + boundary + "\r\n";
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 3 msg += "Content-Type: multipart/alternative;\r\n boundary=\"" + inner + "\"\r\n\r\n";
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 3 msg += "--" + inner + "\r\n";
605
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 3 msg += "Content-Type: text/plain; charset=UTF-8\r\n";
606
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 3 msg += "Content-Transfer-Encoding: quoted-printable\r\n\r\n";
607
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 3 msg += encodeQuotedPrintable(m_bodyText.toUtf8()) + "\r\n";
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 3 msg += "--" + inner + "\r\n";
609
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 3 msg += "Content-Type: text/calendar; method=" + m_calendarMethod + "; charset=UTF-8\r\n";
610
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 3 msg += "Content-Transfer-Encoding: base64\r\n\r\n";
611
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 3 const QByteArray encoded = m_calendar.toBase64();
612
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 16 for (qsizetype offset = 0; offset < encoded.size(); offset += 76)
613
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 13 msg += encoded.mid(offset, 76) + "\r\n";
614
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 3 msg += "--" + inner + "--\r\n";
615 3 } else {
616 // Text body part
617
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 38 msg += "--" + boundary + "\r\n";
618
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 38 msg += "Content-Type: text/plain; charset=UTF-8\r\n";
619
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 38 msg += "Content-Transfer-Encoding: quoted-printable\r\n";
620
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 38 msg += "\r\n";
621
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 38 msg += encodeQuotedPrintable(m_bodyText.toUtf8()) + "\r\n";
622 }
623
624 // Attachment parts
625
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 41 appendAttachmentParts(msg, boundary);
626
627
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 41 msg += "--" + boundary + "--\r\n";
628 41 }
629
630 392 return msg;
631 429 }
632
633 45 void Rfc2822Builder::appendAttachmentParts(QByteArray &msg, const QByteArray &boundary) const {
634
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 104 for (const auto &att : m_attachments) {
635
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 59 msg += "--" + boundary + "\r\n";
636 // T-614/SEC-13: Sanitize mimeType to prevent CRLF header injection
637
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 59 const QByteArray mime = leafMimeType(att.mimeType);
638
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 118 msg += "Content-Type: " + mime + ";\r\n" +
639
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 177 encodeMimeFilenameParameters("name", att.filename) + "\r\n";
640
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 59 msg += "Content-Transfer-Encoding: base64\r\n";
641 59 msg += "Content-Disposition: attachment;\r\n" +
642
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 177 encodeMimeFilenameParameters("filename", att.filename) +
643
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 59 "\r\n";
644
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 59 msg += "\r\n";
645
646 // Base64 with 76-char line wrapping
647
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 59 QByteArray b64 = att.data.toBase64();
648
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 170814 for (int i = 0; i < b64.size(); i += 76) {
649
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 170755 msg += b64.mid(i, 76) + "\r\n";
650 }
651 59 }
652 45 }
653
654 namespace {
655 9 QByteArray base64Lines(const QByteArray &data) {
656 9 QByteArray out;
657
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 9 const QByteArray encoded = data.toBase64();
658
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 35 for (qsizetype offset = 0; offset < encoded.size(); offset += 76)
659
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 26 out += encoded.mid(offset, 76) + "\r\n";
660 9 return out;
661 9 }
662
663 // A token for a Content-ID: what the composer generates, never header syntax.
664 7 QByteArray safeContentId(const QString &contentId) {
665 7 QByteArray out;
666
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 155 for (const QChar c : contentId)
667
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 296 if (c.unicode() > 32 && c.unicode() < 127 && c != QLatin1Char('<') && c != QLatin1Char('>') &&
668
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 296 c != QLatin1Char('"') && c != QLatin1Char('\\'))
669
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 148 out += char(c.unicode());
670
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 14 return out.left(200);
671 7 }
672 } // namespace
673
674 // Sprint 108 S108.2.4: the formatted body. Tree (F-17 order kept):
675 // mixed → alternative [text, related(html, images) | html, calendar] → files
676 // where each container appears only when needed.
677 31 void Rfc2822Builder::appendFormattedBody(QByteArray &msg) const {
678
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 31 const QByteArray mixed = m_attachments.isEmpty() ? QByteArray() : generateBoundary();
679
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 31 const QByteArray alternative = generateBoundary();
680
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 31 const QByteArray related = m_inlineImages.isEmpty() ? QByteArray() : generateBoundary();
681
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 31 if (!mixed.isEmpty()) {
682
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 4 msg += "Content-Type: multipart/mixed;\r\n boundary=\"" + mixed + "\"\r\n\r\n";
683
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 4 msg += "--" + mixed + "\r\n";
684 }
685
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 31 msg += "Content-Type: multipart/alternative;\r\n boundary=\"" + alternative + "\"\r\n\r\n";
686
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 31 msg += "--" + alternative + "\r\n";
687
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 31 msg += "Content-Type: text/plain; charset=UTF-8\r\n";
688
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 31 msg += "Content-Transfer-Encoding: quoted-printable\r\n\r\n";
689
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 31 msg += encodeQuotedPrintable(m_bodyText.toUtf8()) + "\r\n";
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 31 msg += "--" + alternative + "\r\n";
691
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 31 if (!related.isEmpty()) {
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 7 msg += "Content-Type: multipart/related;\r\n boundary=\"" + related + "\"; type=\"text/html\"\r\n\r\n";
693
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 7 msg += "--" + related + "\r\n";
694 }
695
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 31 msg += "Content-Type: text/html; charset=UTF-8\r\n";
696
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 31 msg += "Content-Transfer-Encoding: quoted-printable\r\n\r\n";
697
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 31 msg += encodeQuotedPrintable(m_bodyHtml.toUtf8()) + "\r\n";
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 31 if (!related.isEmpty()) {
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 14 for (const InlineImage &image : m_inlineImages) {
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 7 const QByteArray mime = leafMimeType(image.mimeType);
701
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 7 msg += "--" + related + "\r\n";
702
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 7 msg += "Content-Type: " + mime + ";\r\n" + encodeMimeFilenameParameters("name", image.filename) + "\r\n";
703
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 7 msg += "Content-Transfer-Encoding: base64\r\n";
704
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 7 msg += "Content-ID: <" + safeContentId(image.contentId) + ">\r\n";
705
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 14 msg += "Content-Disposition: inline;\r\n" + encodeMimeFilenameParameters("filename", image.filename) +
706
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 7 "\r\n\r\n";
707
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 7 msg += base64Lines(image.data);
708 7 }
709
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 7 msg += "--" + related + "--\r\n";
710 }
711
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 31 if (!m_calendar.isEmpty()) {
712
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 2 msg += "--" + alternative + "\r\n";
713
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 2 msg += "Content-Type: text/calendar; method=" + m_calendarMethod + "; charset=UTF-8\r\n";
714
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 2 msg += "Content-Transfer-Encoding: base64\r\n\r\n";
715
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 2 msg += base64Lines(m_calendar);
716 }
717
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 31 msg += "--" + alternative + "--\r\n";
718
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 31 if (!mixed.isEmpty()) {
719
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 4 appendAttachmentParts(msg, mixed);
720
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 4 msg += "--" + mixed + "--\r\n";
721 }
722 31 }
723