Get a Repository File with Permissions Information

final String gDriveRepositoryId = '0XCxx00000000ODGAY', gDriveFileId = 'file:0B0lTys1KmM3sTmxKNjVJbWZja00';

final ConnectApi.RepositoryFileDetail file = ConnectApi.ContentHub.getRepositoryFile(gDriveRepositoryId, gDriveFileId, true);
System.debug(String.format('File - name: \'\'{0}\'\', size: {1}, external URL: \'\'{2}\'\', download URL: \'\'{3}\'\'', new String[]{ file.name, String.valueOf(file.contentSize), file.externalDocumentUrl, file.downloadUrl}));
final ConnectApi.ExternalFilePermissionInformation externalFilePermInfo = file.externalFilePermissionInformation;

//permission types
final List<ConnectApi.ContentHubPermissionType> permissionTypes = externalFilePermInfo.externalFilePermissionTypes;
for(ConnectApi.ContentHubPermissionType permissionType : permissionTypes){
   System.debug(String.format('Permission type - id: \'\'{0}\'\', label: \'\'{1}\'\'', new String[]{ permissionType.id, permissionType.label}));
}

//permission groups
final List<ConnectApi.RepositoryGroupSummary> groups = externalFilePermInfo.repositoryPublicGroups;
for(ConnectApi.RepositoryGroupSummary ggroup : groups){
   System.debug(String.format('Group - id: \'\'{0}\'\', name: \'\'{1}\'\', type: \'\'{2}\'\'', new String[]{ ggroup.id, ggroup.name, ggroup.type.name()}));
}