Add property for detecting of application override server url is in fact a JSON array string describing multiple servers

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

src/libsync/theme.cpp

@@ -30,6 +30,8 @@
 #include <QSslSocket>
 #include <QSvgRenderer>
 #include <QPainter>
+#include <QJsonDocument>
+#include <QJsonArray>
 
 #include "nextcloudtheme.h"
 
@@ -383,6 +385,7 @@ Theme::Theme()
 #endif
 #ifdef APPLICATION_SERVER_URL
     _overrideServerUrl = QString::fromLatin1(APPLICATION_SERVER_URL);
+    updateMultipleOverrideServers();
 #endif
 }
 
@@ -432,6 +435,18 @@ bool Theme::forceOverrideServerUrl() const
     return _forceOverrideServerUrl;
 }
 
+void Theme::updateMultipleOverrideServers()
+{
+    const auto json = overrideServerUrl().toUtf8();
+    const auto doc = QJsonDocument::fromJson(json);
+    _multipleOverrideServers = doc.isArray() && !doc.array().empty();
+}
+
+bool Theme::multipleOverrideServers() const
+{
+    return _multipleOverrideServers;
+}
+
 bool Theme::isVfsEnabled() const
 {
     return _isVfsEnabled;
@@ -954,6 +969,7 @@ void Theme::setOverrideServerUrl(const QString &overrideServerUrl)
 {
     if (_overrideServerUrl != overrideServerUrl) {
         _overrideServerUrl = overrideServerUrl;
+        updateMultipleOverrideServers();
         emit overrideServerUrlChanged();
     }
 }

src/libsync/theme.h

@@ -232,11 +232,18 @@ public:
 
     /**
      * Setting a value here will pre-define the server url.
+     * Can be a url OR a JSON array of servers description objects: {"name": "x", "url": "y"}
      *
      * The respective UI controls will be disabled only if forceOverrideServerUrl() is true
      */
     [[nodiscard]] QString overrideServerUrl() const;
 
+    /**
+     * Indicates whether the override server URL is in fact a JSON array of server description
+     * objects.
+     */
+    [[nodiscard]] bool multipleOverrideServers() const;
+
     /**
      * Enforce a pre-defined server url.
      *
@@ -627,6 +634,7 @@ private:
     Theme(Theme const &);
     Theme &operator=(Theme const &);
 
+    void updateMultipleOverrideServers();
     void connectToPaletteSignal();
 #if defined(Q_OS_WIN)
     QPalette reserveDarkPalette; // Windows 11 button and window dark colours
@@ -638,6 +646,7 @@ private:
 
     QString _overrideServerUrl;
     bool _forceOverrideServerUrl = false;
+    bool _multipleOverrideServers = false;
     bool _isVfsEnabled = false;
     bool _startLoginFlowAutomatically = false;