Add displayName getters to QSslCertificate

Provides two convenient getter for a display name of the subject and
issuer. This simplifies cases where you just want a simple string
describing either of the two.

Change-Id: Ia5d0e058f14dae067b13ac7360e7fec4edd9ec53
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/network/ssl/qsslcertificate.cpp

@@ -691,6 +691,56 @@ QByteArray QSslCertificatePrivate::subjectInfoToString(QSslCertificate::SubjectI
     return str;
 }
 
+/*!
+    \since 5.12
+
+    Returns a name that describes the issuer. It returns the QSslCertificate::CommonName
+    if available, otherwise falls back to the first QSslCertificate::Organization or the
+    first QSslCertificate::OrganizationalUnitName.
+
+    \sa issuerInfo()
+*/
+QString QSslCertificate::issuerDisplayName() const
+{
+    QStringList names;
+    names = issuerInfo(QSslCertificate::CommonName);
+    if (!names.isEmpty())
+        return names.first();
+    names = issuerInfo(QSslCertificate::Organization);
+    if (!names.isEmpty())
+        return names.first();
+    names = issuerInfo(QSslCertificate::OrganizationalUnitName);
+    if (!names.isEmpty())
+        return names.first();
+
+    return QString();
+}
+
+/*!
+    \since 5.12
+
+    Returns a name that describes the subject. It returns the QSslCertificate::CommonName
+    if available, otherwise falls back to the first QSslCertificate::Organization or the
+    first QSslCertificate::OrganizationalUnitName.
+
+    \sa subjectInfo()
+*/
+QString QSslCertificate::subjectDisplayName() const
+{
+    QStringList names;
+    names = subjectInfo(QSslCertificate::CommonName);
+    if (!names.isEmpty())
+        return names.first();
+    names = subjectInfo(QSslCertificate::Organization);
+    if (!names.isEmpty())
+        return names.first();
+    names = subjectInfo(QSslCertificate::OrganizationalUnitName);
+    if (!names.isEmpty())
+        return names.first();
+
+    return QString();
+}
+
 /*!
     \fn uint qHash(const QSslCertificate &key, uint seed)
 
@@ -708,8 +758,8 @@ QDebug operator<<(QDebug debug, const QSslCertificate &certificate)
           << certificate.version()
           << ", " << certificate.serialNumber()
           << ", " << certificate.digest().toBase64()
-          << ", " << certificate.issuerInfo(QSslCertificate::Organization)
-          << ", " << certificate.subjectInfo(QSslCertificate::Organization)
+          << ", " << certificate.issuerDisplayName()
+          << ", " << certificate.subjectDisplayName()
           << ", " << certificate.subjectAlternativeNames()
 #ifndef QT_NO_DATESTRING
           << ", " << certificate.effectiveDate()

src/network/ssl/qsslcertificate.h

@@ -120,6 +120,9 @@ public:
     QStringList issuerInfo(const QByteArray &attribute) const;
     QStringList subjectInfo(SubjectInfo info) const;
     QStringList subjectInfo(const QByteArray &attribute) const;
+    QString issuerDisplayName() const;
+    QString subjectDisplayName() const;
+
     QList<QByteArray> subjectInfoAttributes() const;
     QList<QByteArray> issuerInfoAttributes() const;
 #if QT_DEPRECATED_SINCE(5,0)