feat: Add {CLIENT_HOSTNAME} placeholder support for backup file patterns

This commit introduces a new placeholder `{CLIENT_HOSTNAME}` that can be used in database backup file patterns. The hostname of the client performing the database save operation will be substituted in place of this placeholder.

Changes include:
- Documentation update to reference the new `{CLIENT_HOSTNAME}` placeholder in the Reference.adoc file
- Implementation of hostname resolution using `QHostInfo::localHostName()` in Tools.cpp
- Addition of Qt5::Network library dependency for both the autotype library and testtools unit test
- New test cases to verify proper substitution of the `{CLIENT_HOSTNAME}` placeholder
- Test case for escaped patterns to ensure they are not replaced
- Updated existing test data to include CLIENT_HOSTNAME in multiple pattern replacement test

The feature enhances backup file naming flexibility by allowing users to include the client hostname in their backup file names, which is particularly useful in multi-machine environments.

docs/topics/Reference.adoc

@@ -110,6 +110,7 @@ Use regular expressions to find and replace data from a resolved placeholder. Re
 |===
 |Database Backup Path Placeholder |Description
 
+|{CLIENT_HOSTNAME} |The hostname of the client performing the database save operation
 |{DB_FILENAME}  |The database's filename without extension
 |{TIME}        |The current time formatted as dd_MM_yyyy_hh-mm-ss.
 |{TIME:<format>}        |The current time formatted according to the format string specified by <format>. See https://doc.qt.io/qt-5/qtime.html#toString for a list of available placeholders.

src/CMakeLists.txt

@@ -375,6 +375,7 @@ target_link_libraries(keepassxc_core
         ${qrcode_LIB}
         Qt5::Core
         Qt5::Concurrent
+        Qt5::Network
         ${BOTAN_LIBRARIES}
         ${PCSC_LIBRARIES}
         ${ZXCVBN_LIBRARIES}

src/core/Tools.cpp

@@ -32,6 +32,7 @@
 #include <QElapsedTimer>
 #include <QEventLoop>
 #include <QFileInfo>
+#include <QHostInfo>
 #include <QIODevice>
 #include <QLocale>
 #include <QMetaProperty>
@@ -498,6 +499,10 @@ namespace Tools
             match = re.match(pattern);
         }
 
+        const QString hostName = QHostInfo::localHostName();
+
+        pattern.replace(QStringLiteral("{CLIENT_HOSTNAME}"), hostName);
+
         // Replace escaped braces
         pattern.replace(QStringLiteral("\\{"), QStringLiteral("{"));
         pattern.replace(QStringLiteral("\\}"), QStringLiteral("}"));

tests/CMakeLists.txt

@@ -218,7 +218,7 @@ add_unit_test(NAME testdatabase SOURCES TestDatabase.cpp
         LIBS testsupport ${TEST_LIBRARIES})
 
 add_unit_test(NAME testtools SOURCES TestTools.cpp
-        LIBS ${TEST_LIBRARIES})
+        LIBS ${TEST_LIBRARIES} Qt5::Network)
 
 add_unit_test(NAME testconfig SOURCES TestConfig.cpp
         LIBS testsupport ${TEST_LIBRARIES})

tests/TestTools.cpp

@@ -21,6 +21,7 @@
 #include "core/Tools.h"
 
 #include <QFileInfo>
+#include <QHostInfo>
 #include <QRegularExpression>
 #include <QTest>
 #include <QUuid>
@@ -132,6 +133,7 @@ void TestTools::testBackupFilePatternSubstitution_data()
     static const auto DEFAULT_DB_FILE_NAME = QStringLiteral("KeePassXC");
     static const auto DEFAULT_DB_FILE_PATH = QStringLiteral("/tmp/") + DEFAULT_DB_FILE_NAME + QStringLiteral(".kdbx");
     static const auto NOW = Clock::currentDateTime();
+    static const QString TEST_CLIENT_HOSTNAME = QHostInfo::localHostName();
     auto DEFAULT_FORMATTED_TIME = NOW.toString("dd_MM_yyyy_hh-mm-ss");
 
     QTest::newRow("Null pattern") << QString() << DEFAULT_DB_FILE_PATH << QString();
@@ -140,13 +142,15 @@ void TestTools::testBackupFilePatternSubstitution_data()
     QTest::newRow("Empty database path") << "valid_pattern" << QString("") << QString();
     QTest::newRow("Unclosed/invalid pattern") << "{DB_FILENAME" << DEFAULT_DB_FILE_PATH << "{DB_FILENAME";
     QTest::newRow("Unknown pattern") << "{NO_MATCH}" << DEFAULT_DB_FILE_PATH << "{NO_MATCH}";
+    QTest::newRow("Do not replace escaped patterns (client hostname)")
+        << "\\{CLIENT_HOSTNAME\\}" << DEFAULT_DB_FILE_PATH << "{CLIENT_HOSTNAME}";
     QTest::newRow("Do not replace escaped patterns (filename)")
         << "\\{DB_FILENAME\\}" << DEFAULT_DB_FILE_PATH << "{DB_FILENAME}";
     QTest::newRow("Do not replace escaped patterns (time)")
         << "\\{TIME:dd.MM.yyyy\\}" << DEFAULT_DB_FILE_PATH << "{TIME:dd.MM.yyyy}";
     QTest::newRow("Multiple patterns should be replaced")
-        << "{DB_FILENAME} {TIME} {DB_FILENAME}" << DEFAULT_DB_FILE_PATH
-        << DEFAULT_DB_FILE_NAME + QStringLiteral(" ") + DEFAULT_FORMATTED_TIME + QStringLiteral(" ")
+        << "{CLIENT_HOSTNAME} {TIME} {DB_FILENAME}" << DEFAULT_DB_FILE_PATH
+        << TEST_CLIENT_HOSTNAME + QStringLiteral(" ") + DEFAULT_FORMATTED_TIME + QStringLiteral(" ")
                + DEFAULT_DB_FILE_NAME;
     QTest::newRow("Default time pattern") << "{TIME}" << DEFAULT_DB_FILE_PATH << DEFAULT_FORMATTED_TIME;
     QTest::newRow("Default time pattern (empty formatter)")
@@ -160,6 +164,9 @@ void TestTools::testBackupFilePatternSubstitution_data()
                + NOW.toString("yyyyMMdd_HHmmss") + QStringLiteral(".old.kdbx");
     QTest::newRow("Invalid custom time pattern") << "{TIME:dd/-ss}" << DEFAULT_DB_FILE_PATH << NOW.toString("dd/-ss");
     QTest::newRow("Recursive substitution") << "{TIME:'{TIME}'}" << DEFAULT_DB_FILE_PATH << DEFAULT_FORMATTED_TIME;
+    QTest::newRow("{CLIENT_HOSTNAME} substitution")
+        << "some {CLIENT_HOSTNAME} thing" << DEFAULT_DB_FILE_PATH
+        << QStringLiteral("some ") + TEST_CLIENT_HOSTNAME + QStringLiteral(" thing");
     QTest::newRow("{DB_FILENAME} substitution")
         << "some {DB_FILENAME} thing" << DEFAULT_DB_FILE_PATH
         << QStringLiteral("some ") + DEFAULT_DB_FILE_NAME + QStringLiteral(" thing");