anotherim-desktop/plugins/http-files/src/plugin.vala

extern const string GETTEXT_PACKAGE;
extern const string LOCALE_INSTALL_DIR;

namespace Dino.Plugins.HttpFiles {

public class Plugin : RootInterface, Object {

    public Dino.Application app;
    public FileProvider file_provider;
    public FileSender file_sender;

    public void registered(Dino.Application app) {
        this.app = app;

        file_provider = new FileProvider(app.stream_interactor, app.db);
        file_sender = new HttpFileSender(app.stream_interactor, app.db);

        app.stream_interactor.get_module(FileManager.IDENTITY).add_provider(file_provider);
        app.stream_interactor.get_module(FileManager.IDENTITY).add_sender(file_sender);

        app.stream_interactor.get_module(ContentItemStore.IDENTITY).add_filter(new FileMessageFilter(app.db));
    }

    public void shutdown() {
        // Nothing to do
    }
}

private bool message_is_file(Database db, Entities.Message message) {
    Qlite.QueryBuilder builder = db.file_transfer.select({db.file_transfer.id}).with(db.file_transfer.info, "=", message.id.to_string());
    Qlite.QueryBuilder builder2 = db.file_transfer.select({db.file_transfer.id}).with(db.file_transfer.info, "=", message.body);
    return builder.count() > 0 || builder2.count() > 0;
}

}