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/*
* qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
* Copyright (C) 2026 Danilo M. <danix@danix.xyz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "contactstore.h"
#include <QDirIterator>
#include <QFile>
#include <QHash>
#include <QStringList>
#include <algorithm>
namespace {
/// Index of the colon separating property from value: the first one that is
/// not inside a double-quoted parameter value.
///
/// `EMAIL;TYPE=INTERNET;LABEL="work: main":a@example.org` has a colon inside
/// the quoted label, and splitting on the first colon would hand the parser
/// `main":a@example.org` as the address. A backslash inside the quotes escapes
/// the next character, so `\"` does not close the quote.
int colonOutsideQuotes(const QString &line)
{
bool inQuotes = false;
for (int i = 0; i < line.size(); ++i) {
const QChar c = line.at(i);
if (c == QLatin1Char('\\')) {
++i; // Skip the escaped character; it cannot be a delimiter.
continue;
}
if (c == QLatin1Char('"')) {
inQuotes = !inQuotes;
continue;
}
if (c == QLatin1Char(':') && !inQuotes)
return i;
}
return -1;
}
/// Decodes the vCard TEXT escape set, applied to FN: a name written
/// `Rossi\, Mario` is one name with a comma, and left escaped the backslash
/// reaches the completion popup. N carries the same escapes, but the struct
/// holds no N and FN is what a display name is.
QString unescapeText(const QString &value)
{
QString out;
out.reserve(value.size());
for (int i = 0; i < value.size(); ++i) {
const QChar c = value.at(i);
if (c != QLatin1Char('\\') || i + 1 >= value.size()) {
out.append(c);
continue;
}
const QChar escaped = value.at(++i);
switch (escaped.unicode()) {
case 'n':
case 'N':
out.append(QLatin1Char('\n'));
break;
case '\\':
case ',':
case ';':
out.append(escaped);
break;
default:
// An unknown escape keeps its character, dropping the backslash
// rather than guessing at a meaning it does not have.
out.append(escaped);
break;
}
}
return out;
}
} // namespace
namespace ContactStore {
QString unfold(const QString &text)
{
QStringList logical;
const QStringList lines = text.split(QLatin1Char('\n'));
for (const QString &rawLine : lines) {
// The store's own files are LF; a CRLF server is handled here rather
// than left to reach a value with a stray carriage return in it.
QString line = rawLine;
if (line.endsWith(QLatin1Char('\r')))
line.chop(1);
const bool isContinuation =
!line.isEmpty()
&& (line.at(0) == QLatin1Char(' ') || line.at(0) == QLatin1Char('\t'));
if (isContinuation && !logical.isEmpty()) {
// Join to the line that precedes it, removing only the marker
// whitespace character. A trailing space on the first line is
// content and survives.
logical.last() += line.mid(1);
} else {
logical.append(line);
}
}
return logical.join(QLatin1Char('\n'));
}
QList<Contact> parseCard(const QString &unfoldedText)
{
QString name;
QStringList emails;
const QStringList lines = unfoldedText.split(QLatin1Char('\n'));
for (QString line : lines) {
if (line.endsWith(QLatin1Char('\r')))
line.chop(1);
if (line.isEmpty())
continue;
const int colon = colonOutsideQuotes(line);
if (colon < 0)
continue;
// The property name is everything before the first ';', and the
// parameters that follow belong to it. Matched case-insensitively per
// RFC 2426, so `email:` is an EMAIL.
const QString property =
line.left(colon).section(QLatin1Char(';'), 0, 0).trimmed();
const QString value = line.mid(colon + 1).trimmed();
if (property.compare(QLatin1String("FN"), Qt::CaseInsensitive) == 0) {
// Last one wins if a malformed card carries two, rather than
// merging two names into one.
name = unescapeText(value);
} else if (property.compare(QLatin1String("EMAIL"), Qt::CaseInsensitive) == 0) {
// PHOTO, ADR, TEL and the rest are not matched and fall through
// unread; N is deliberately not used as a fallback name, because
// FN is what a display name is.
if (!value.isEmpty())
emails.append(value);
}
}
QList<Contact> contacts;
contacts.reserve(emails.size());
for (const QString &email : emails)
contacts.append(Contact{ name, email });
return contacts;
}
QList<Contact> loadDirectory(const QString &directory)
{
QList<Contact> found;
if (directory.isEmpty())
return found;
// Recursive because a vdir keeps one subdirectory per collection. A
// missing root simply yields nothing; no warning, since a machine with no
// vdir is the ordinary case.
QDirIterator it(directory, QStringList{ QStringLiteral("*.vcf") },
QDir::Files, QDirIterator::Subdirectories);
while (it.hasNext()) {
QFile file(it.next());
if (!file.open(QIODevice::ReadOnly))
continue; // Unreadable: skip it, do not lose the rest.
const QString text = QString::fromUtf8(file.readAll());
found += parseCard(unfold(text));
}
// De-duplicated on the address, case-insensitively: two collections
// holding the same person is the ordinary case, not an error. The first
// card seen wins.
QList<Contact> unique;
QHash<QString, int> seen;
unique.reserve(found.size());
for (const Contact &contact : found) {
const QString key = contact.email.toLower();
if (seen.contains(key))
continue;
seen.insert(key, unique.size());
unique.append(contact);
}
// Sorted by name then address, case-insensitively. A locale-aware compare
// is deliberately not used: the order is a completion list, not prose.
std::sort(unique.begin(), unique.end(),
[](const Contact &a, const Contact &b) {
const int byName =
QString::compare(a.name, b.name, Qt::CaseInsensitive);
if (byName != 0)
return byName < 0;
return QString::compare(a.email, b.email, Qt::CaseInsensitive) < 0;
});
return unique;
}
} // namespace ContactStore
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