Add thumbnailer module

src/CMakeLists.txt

 add_subdirectory(appimageservices-interface)
 add_subdirectory(fileitem-actions)
 add_subdirectory(metadata-extractor)
+add_subdirectory(thumbnailer)
 add_subdirectory(bin)
 

src/thumbnailer/AppImageThumbnailCreator.cpp

+// libraries
+#include <QString>
+#include <QImage>
+#include <QStandardPaths>
+#include <QMimeType>
+#include <QLoggingCategory>
+#include <QUrl>
+#include <QFile>
+#include <QDir>
+#include <QTemporaryFile>
+#include <QStandardPaths>
+#include <QCryptographicHash>
+
+// local
+#include "AppImageThumbnailCreator.h"
+#include "InspectorInterface.h"
+
+Q_LOGGING_CATEGORY(LOG_APPIMAGE_THUMBS, "AppImageThumbnailer")
+
+extern "C"
+{
+Q_DECL_EXPORT ThumbCreator* new_creator() {
+    return new AppImageThumbnailCreator();
+}
+}
+
+AppImageThumbnailCreator::AppImageThumbnailCreator(QObject* parent) : QObject(parent),
+                                                                      inspectorInterface(
+                                                                          new OrgAppimageServices1InspectorInterface(
+                                                                              "org.appimage.Services1.Inspector",
+                                                                              "/org/appimage/Services1/Inspector",
+                                                                              QDBusConnection::sessionBus(), this)) {
+}
+
+AppImageThumbnailCreator::~AppImageThumbnailCreator() = default;
+
+
+ThumbCreator::Flags AppImageThumbnailCreator::flags() const {
+    return ThumbCreator::None;
+}
+
+bool AppImageThumbnailCreator::create(const QString& path, int w, int h, QImage& thumb) {
+    if (inspectorInterface->isValid()) {
+        QTemporaryFile temporaryFile;
+        if (temporaryFile.open()) {
+            auto reply = inspectorInterface->extractFile(path, ".DirIcon", temporaryFile.fileName());
+            reply.waitForFinished();
+
+            if (reply.isError()) {
+                return false;
+            } else {
+                bool res = thumb.load(temporaryFile.fileName());
+                thumb = thumb.scaled(w, h);
+                return res;
+            }
+
+        } else {
+            return false;
+        }
+
+    } else {
+        qCDebug(LOG_APPIMAGE_THUMBS) << "Unable to connect to appimage services dbus interface";
+        return false;
+    }
+}
+
+bool AppImageThumbnailCreator::isAnAcceptedMimeType(const QString& path) const {
+    QMimeType type = db.mimeTypeForFile(path);
+    return type.isValid() &&
+           (type.inherits("application/x-iso9660-appimage") || type.inherits("application/vnd.appimage"));
+}
+

src/thumbnailer/AppImageThumbnailCreator.h

+#pragma once
+
+// libraries
+#include <QObject>
+#include <QMimeDatabase>
+#include <QLoggingCategory>
+#include <kio/thumbcreator.h>
+
+Q_DECLARE_LOGGING_CATEGORY(LOG_APPIMAGE_THUMBS)
+
+class OrgAppimageServices1InspectorInterface;
+
+class AppImageThumbnailCreator : public QObject, public ThumbCreator {
+Q_OBJECT
+    QMimeDatabase db;
+public:
+    explicit AppImageThumbnailCreator(QObject* parent = 0);
+
+    ~AppImageThumbnailCreator() override;
+
+    bool create(const QString& path, int w, int h, QImage& thumb) override;
+
+    Flags flags() const override;
+
+    bool isAnAcceptedMimeType(const QString& path) const;
+
+private:
+    OrgAppimageServices1InspectorInterface *inspectorInterface;
+
+};

src/thumbnailer/CMakeLists.txt

+add_library(appimage-thumbnailer MODULE AppImageThumbnailCreator.cpp)
+
+target_link_libraries(appimage-thumbnailer PRIVATE KF5::KIOWidgets appimageservices-interfaces)
+
+install(TARGETS appimage-thumbnailer DESTINATION ${PLUGIN_INSTALL_DIR})
+install(FILES org.appimage.appimage-thumbnailer.desktop DESTINATION ${SERVICES_INSTALL_DIR})

src/thumbnailer/org.appimage.appimage-thumbnailer.desktop

+[Desktop Entry]
+Encoding=UTF-8
+Type=Service
+Name=AppImage
+ServiceTypes=ThumbCreator
+MimeType=application/x-iso9660-appimage;application/vnd.appimage;
+CacheThumbnail=true
+X-KDE-Library=appimage-thumbnailer
+ThumbnailerVersion=6