refs #911, utility functions for cut and paste JSON

src/blackcore/db/databaseauthentication.cpp

@@ -126,7 +126,7 @@ namespace BlackCore
                     CLogMessage(this).error("Authentication failed, no response from %1") << urlString;
                     return;
                 }
-                if (!json.startsWith('{') || !json.endsWith('}'))
+                if (!Json::looksLikeJson(json))
                 {
                     CLogMessage(this).error("Illegal JSON object: %1") << CNetworkUtils::removeHtmlPartsFromPhpErrorMessage(json);
                     return;

src/blackmisc/json.cpp

@@ -449,5 +449,18 @@ namespace BlackMisc
             }
             return currentObject;
         }
+
+        bool looksLikeJson(const QString &json)
+        {
+            if (json.isEmpty()) { return false; }
+            const QString t = json.trimmed();
+            return t.startsWith('{') && t.endsWith('}');
+        }
+
+        bool looksLikeSwiftJson(const QString &json)
+        {
+            // further checks would go here
+            return looksLikeJson(json);
+        }
     }
 }

src/blackmisc/json.h

@@ -250,6 +250,14 @@ namespace BlackMisc
         //! Merges an incremental json object into an existing one
         BLACKMISC_EXPORT QJsonObject applyIncrementalObject(const QJsonObject &previousObject, const QJsonObject &incrementalObject);
 
+        //! Looks like swift JSON?
+        //! \remark Quick check if the string could be a valid JSON string
+        BLACKMISC_EXPORT bool looksLikeJson(const QString &json);
+
+        //! Looks like swift JSON?
+        //! \remark Quick check if the string could be a valid swift JSON string
+        BLACKMISC_EXPORT bool looksLikeSwiftJson(const QString &json);
+
         /*!
          * Load JSON file and init by that
          */