Piwik\Plugins\CorePluginsAdmin\PluginInstaller::getPathToPluginJson PHP Method

    private function getPathToPluginJson($tmpPluginFolder)
    {
        $firstSubFolder = $this->getNameOfFirstSubfolder($tmpPluginFolder);
        $path = $tmpPluginFolder . DIRECTORY_SEPARATOR . $firstSubFolder . DIRECTORY_SEPARATOR . 'plugin.json';
        return $path;
    }