[qt5cpp] delete callback data allocated before signal emission (#7840)

* Small fixes to prevent crash when empty json body is provided.

* Add deleteLater wrapper for pointers passed to user code to prevent memory leak.

* Updates to move Object Wrapper to separate file

* Add Prefix to class name

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/Qt5CPPGenerator.java

@@ -117,6 +117,7 @@ public class Qt5CPPGenerator extends AbstractCppCodegen implements CodegenConfig
         supportingFiles.add(new SupportingFile("HttpRequest.cpp.mustache", sourceFolder, PREFIX + "HttpRequest.cpp"));
         supportingFiles.add(new SupportingFile("modelFactory.mustache", sourceFolder, PREFIX + "ModelFactory.h"));
         supportingFiles.add(new SupportingFile("object.mustache", sourceFolder, PREFIX + "Object.h"));
+        supportingFiles.add(new SupportingFile("QObjectWrapper.h.mustache", sourceFolder, PREFIX + "QObjectWrapper.h"));
         if (optionalProjectFileFlag) {
             supportingFiles.add(new SupportingFile("Project.mustache", sourceFolder, "client.pri"));
         }
@@ -176,6 +177,7 @@ public class Qt5CPPGenerator extends AbstractCppCodegen implements CodegenConfig
             supportingFiles.add(new SupportingFile("HttpRequest.cpp.mustache", sourceFolder, modelNamePrefix + "HttpRequest.cpp"));
             supportingFiles.add(new SupportingFile("modelFactory.mustache", sourceFolder, modelNamePrefix + "ModelFactory.h"));
             supportingFiles.add(new SupportingFile("object.mustache", sourceFolder, modelNamePrefix + "Object.h"));
+            supportingFiles.add(new SupportingFile("QObjectWrapper.h.mustache", sourceFolder, modelNamePrefix + "QObjectWrapper.h"));
 
             typeMapping.put("object", modelNamePrefix + "Object");
             typeMapping.put("file", modelNamePrefix + "HttpRequestInputFileElement");

modules/swagger-codegen/src/main/resources/qt5cpp/Project.mustache

@@ -19,7 +19,8 @@ HEADERS += \
     $${PWD}/{{prefix}}Helpers.h \
     $${PWD}/{{prefix}}HttpRequest.h \
     $${PWD}/{{prefix}}ModelFactory.h \
-    $${PWD}/{{prefix}}Object.h
+    $${PWD}/{{prefix}}Object.h \
+    $${PWD}/{{prefix}}QObjectWrapper.h
 
 SOURCES += \
 # Models

modules/swagger-codegen/src/main/resources/qt5cpp/QObjectWrapper.h.mustache

@@ -0,0 +1,28 @@
+{{>licenseInfo}}
+#ifndef {{prefix}}_QOBJECT_WRAPPER_H
+#define {{prefix}}_QOBJECT_WRAPPER_H
+
+#include <QObject>
+
+{{#cppNamespaceDeclarations}}
+namespace {{this}} {
+{{/cppNamespaceDeclarations}}
+
+    template <typename ObjectPtrT>
+    class {{prefix}}QObjectWrapper : public QObject {
+        public:
+            {{prefix}}QObjectWrapper(ObjectPtrT ptr){
+                data = ptr;
+            }
+            ~{{prefix}}QObjectWrapper(){
+                delete data;
+            }
+        private :
+            ObjectPtrT data;
+    };
+
+{{#cppNamespaceDeclarations}}
+}
+{{/cppNamespaceDeclarations}}
+
+#endif // {{prefix}}_QOBJECT_WRAPPER_H

modules/swagger-codegen/src/main/resources/qt5cpp/api-body.mustache

@@ -2,6 +2,7 @@
 #include "{{classname}}.h"
 #include "{{prefix}}Helpers.h"
 #include "{{prefix}}ModelFactory.h"
+#include "{{prefix}}QObjectWrapper.h"
 
 #include <QJsonArray>
 #include <QJsonDocument>
@@ -150,20 +151,30 @@ void
     QByteArray array (json.toStdString().c_str());
     QJsonDocument doc = QJsonDocument::fromJson(array);
     QJsonArray jsonArray = doc.array();
-
+    auto wrapper = new {{prefix}}QObjectWrapper<{{{returnType}}}> (output);
+    wrapper->deleteLater();
     foreach(QJsonValue obj, jsonArray) {
         {{{returnBaseType}}}* o = new {{returnBaseType}}();
         QJsonObject jv = obj.toObject();
         QJsonObject * ptr = (QJsonObject*)&jv;
         o->fromJsonObject(*ptr);
+        auto objwrapper = new {{prefix}}QObjectWrapper<{{{returnBaseType}}}*> (o);
+        objwrapper->deleteLater();
         output->append(o);
     }
     {{/isListContainer}}
-
     {{^isListContainer}}
     {{^isMapContainer}}
     {{#returnTypeIsPrimitive}}
     {{{returnType}}} output;  // TODO add primitive output support
+    {{#isByteArray}}auto wrapper = new {{prefix}}QObjectWrapper<{{{returnType}}}> (output);
+    wrapper->deleteLater();{{/isByteArray}}
+    {{#isDateTime}}auto wrapper = new {{prefix}}QObjectWrapper<{{{returnType}}}> (output);
+    wrapper->deleteLater();{{/isDateTime}}
+    {{#isDate}}auto wrapper = new {{prefix}}QObjectWrapper<{{{returnType}}}> (output);
+    wrapper->deleteLater();{{/isDate}}
+    {{#isString}}auto wrapper = new {{prefix}}QObjectWrapper<{{{returnType}}}> (output);
+    wrapper->deleteLater();{{/isString}}
     {{/returnTypeIsPrimitive}}
     {{/isMapContainer}}
     {{#isMapContainer}}
@@ -183,6 +194,8 @@ void
     {{^returnTypeIsPrimitive}}
     QString json(worker->response);
     {{{returnType}}} output = static_cast<{{{returnType}}}>(create(json, QString("{{{returnBaseType}}}")));
+    auto wrapper = new {{prefix}}QObjectWrapper<{{{returnType}}}> (output);
+    wrapper->deleteLater();
     {{/returnTypeIsPrimitive}}
     {{/isMapContainer}}
     {{/isListContainer}}

samples/client/petstore/qt5cpp/PetStore/PetApiTests.cpp

@@ -185,7 +185,7 @@ void PetApiTests::updatePetWithFormTest() {
     static SWGPetApi* api = getApi();
 
     SWGPet* pet = createRandomPet();
-    static SWGPet* petToCheck;
+    SWGPet* petToCheck;
     qint64 id = pet->getId();
     static QEventLoop loop;
     QTimer timer;
@@ -209,7 +209,7 @@ void PetApiTests::updatePetWithFormTest() {
     timer.setInterval(1000);
     timer.setSingleShot(true);
 
-    auto fetchPet = [](SWGPet* pet) {
+    auto fetchPet = [&](SWGPet* pet) {
         petToCheck = pet;
         loop.quit();
     };

samples/client/petstore/qt5cpp/client/SWGPetApi.cpp

@@ -13,6 +13,7 @@
 #include "SWGPetApi.h"
 #include "SWGHelpers.h"
 #include "SWGModelFactory.h"
+#include "SWGQObjectWrapper.h"
 
 #include <QJsonArray>
 #include <QJsonDocument>
@@ -220,15 +221,17 @@ SWGPetApi::findPetsByStatusCallback(SWGHttpRequestWorker * worker) {
     QByteArray array (json.toStdString().c_str());
     QJsonDocument doc = QJsonDocument::fromJson(array);
     QJsonArray jsonArray = doc.array();
-
+    auto wrapper = new SWGQObjectWrapper<QList<SWGPet*>*> (output);
+    wrapper->deleteLater();
     foreach(QJsonValue obj, jsonArray) {
         SWGPet* o = new SWGPet();
         QJsonObject jv = obj.toObject();
         QJsonObject * ptr = (QJsonObject*)&jv;
         o->fromJsonObject(*ptr);
+        auto objwrapper = new SWGQObjectWrapper<SWGPet*> (o);
+        objwrapper->deleteLater();
         output->append(o);
     }
-
     worker->deleteLater();
 
     if (worker->error_type == QNetworkReply::NoError) {
@@ -325,15 +328,17 @@ SWGPetApi::findPetsByTagsCallback(SWGHttpRequestWorker * worker) {
     QByteArray array (json.toStdString().c_str());
     QJsonDocument doc = QJsonDocument::fromJson(array);
     QJsonArray jsonArray = doc.array();
-
+    auto wrapper = new SWGQObjectWrapper<QList<SWGPet*>*> (output);
+    wrapper->deleteLater();
     foreach(QJsonValue obj, jsonArray) {
         SWGPet* o = new SWGPet();
         QJsonObject jv = obj.toObject();
         QJsonObject * ptr = (QJsonObject*)&jv;
         o->fromJsonObject(*ptr);
+        auto objwrapper = new SWGQObjectWrapper<SWGPet*> (o);
+        objwrapper->deleteLater();
         output->append(o);
     }
-
     worker->deleteLater();
 
     if (worker->error_type == QNetworkReply::NoError) {
@@ -385,9 +390,10 @@ SWGPetApi::getPetByIdCallback(SWGHttpRequestWorker * worker) {
         msg = "Error: " + worker->error_str;
     }
 
-
     QString json(worker->response);
     SWGPet* output = static_cast<SWGPet*>(create(json, QString("SWGPet")));
+    auto wrapper = new SWGQObjectWrapper<SWGPet*> (output);
+    wrapper->deleteLater();
     worker->deleteLater();
 
     if (worker->error_type == QNetworkReply::NoError) {
@@ -554,9 +560,10 @@ SWGPetApi::uploadFileCallback(SWGHttpRequestWorker * worker) {
         msg = "Error: " + worker->error_str;
     }
 
-
     QString json(worker->response);
     SWGApiResponse* output = static_cast<SWGApiResponse*>(create(json, QString("SWGApiResponse")));
+    auto wrapper = new SWGQObjectWrapper<SWGApiResponse*> (output);
+    wrapper->deleteLater();
     worker->deleteLater();
 
     if (worker->error_type == QNetworkReply::NoError) {

samples/client/petstore/qt5cpp/client/SWGQObjectWrapper.h

@@ -0,0 +1,35 @@
+/**
+ * Swagger Petstore
+ * This is a sample server Petstore server.  You can find out more about Swagger at [http://swagger.io](http://swagger.io) or on [irc.freenode.net, #swagger](http://swagger.io/irc/).  For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * OpenAPI spec version: 1.0.0
+ * Contact: apiteam@swagger.io
+ *
+ * NOTE: This class is auto generated by the swagger code generator program.
+ * https://github.com/swagger-api/swagger-codegen.git
+ * Do not edit the class manually.
+ */
+
+#ifndef SWG_QOBJECT_WRAPPER_H
+#define SWG_QOBJECT_WRAPPER_H
+
+#include <QObject>
+
+namespace Swagger {
+
+    template <typename ObjectPtrT>
+    class SWGQObjectWrapper : public QObject {
+        public:
+            SWGQObjectWrapper(ObjectPtrT ptr){
+                data = ptr;
+            }
+            ~SWGQObjectWrapper(){
+                delete data;
+            }
+        private :
+            ObjectPtrT data;
+    };
+
+}
+
+#endif // SWG_QOBJECT_WRAPPER_H

samples/client/petstore/qt5cpp/client/SWGStoreApi.cpp

@@ -13,6 +13,7 @@
 #include "SWGStoreApi.h"
 #include "SWGHelpers.h"
 #include "SWGModelFactory.h"
+#include "SWGQObjectWrapper.h"
 
 #include <QJsonArray>
 #include <QJsonDocument>
@@ -118,7 +119,6 @@ SWGStoreApi::getInventoryCallback(SWGHttpRequestWorker * worker) {
         msg = "Error: " + worker->error_str;
     }
 
-
     QMap<QString, qint32>* output = new QMap<QString, qint32>();
     QString json(worker->response);
     QByteArray array (json.toStdString().c_str());
@@ -181,9 +181,10 @@ SWGStoreApi::getOrderByIdCallback(SWGHttpRequestWorker * worker) {
         msg = "Error: " + worker->error_str;
     }
 
-
     QString json(worker->response);
     SWGOrder* output = static_cast<SWGOrder*>(create(json, QString("SWGOrder")));
+    auto wrapper = new SWGQObjectWrapper<SWGOrder*> (output);
+    wrapper->deleteLater();
     worker->deleteLater();
 
     if (worker->error_type == QNetworkReply::NoError) {
@@ -236,9 +237,10 @@ SWGStoreApi::placeOrderCallback(SWGHttpRequestWorker * worker) {
         msg = "Error: " + worker->error_str;
     }
 
-
     QString json(worker->response);
     SWGOrder* output = static_cast<SWGOrder*>(create(json, QString("SWGOrder")));
+    auto wrapper = new SWGQObjectWrapper<SWGOrder*> (output);
+    wrapper->deleteLater();
     worker->deleteLater();
 
     if (worker->error_type == QNetworkReply::NoError) {

samples/client/petstore/qt5cpp/client/SWGUserApi.cpp

@@ -13,6 +13,7 @@
 #include "SWGUserApi.h"
 #include "SWGHelpers.h"
 #include "SWGModelFactory.h"
+#include "SWGQObjectWrapper.h"
 
 #include <QJsonArray>
 #include <QJsonDocument>
@@ -284,9 +285,10 @@ SWGUserApi::getUserByNameCallback(SWGHttpRequestWorker * worker) {
         msg = "Error: " + worker->error_str;
     }
 
-
     QString json(worker->response);
     SWGUser* output = static_cast<SWGUser*>(create(json, QString("SWGUser")));
+    auto wrapper = new SWGQObjectWrapper<SWGUser*> (output);
+    wrapper->deleteLater();
     worker->deleteLater();
 
     if (worker->error_type == QNetworkReply::NoError) {
@@ -352,9 +354,10 @@ SWGUserApi::loginUserCallback(SWGHttpRequestWorker * worker) {
         msg = "Error: " + worker->error_str;
     }
 
-
     QString json(worker->response);
     QString* output = static_cast<QString*>(create(json, QString("QString")));
+    auto wrapper = new SWGQObjectWrapper<QString*> (output);
+    wrapper->deleteLater();
     worker->deleteLater();
 
     if (worker->error_type == QNetworkReply::NoError) {

samples/client/petstore/qt5cpp/client/client.pri

@@ -16,7 +16,8 @@ HEADERS += \
     $${PWD}/SWGHelpers.h \
     $${PWD}/SWGHttpRequest.h \
     $${PWD}/SWGModelFactory.h \
-    $${PWD}/SWGObject.h
+    $${PWD}/SWGObject.h \
+    $${PWD}/SWGQObjectWrapper.h
 
 SOURCES += \
 # Models