If you have any questions during development, post them on the Issues page of GitHub.

static void test_get_object_auth()
{
    // Create and initialize option.
    obs_options option;
    init_obs_options(&option);
    option.bucket_options.host_name = "<your-endpoint>";
    option.bucket_options.bucket_name = "<Your bucketname>";

    // Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables ACCESS_KEY_ID and SECRET_ACCESS_KEY.
    // Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/en-us/usermanual-ca/ca_01_0003.html.
    option.bucket_options.access_key = getenv("ACCESS_KEY_ID");
    option.bucket_options.secret_access_key = getenv("SECRET_ACCESS_KEY");
    temp_auth_configure tempauth;
        
    tempAuthResult  ptrResult;
    memset_s(&ptrResult,sizeof(tempAuthResult),0,sizeof(tempAuthResult));
    // Callback data
    tempauth.callback_data = (void *)(&ptrResult);  
    // Validity period
    tempauth.expires = 10;
    // Callback function returns and generates the temporary URL.
    tempauth.temp_auth_callback = &tempAuthCallBack_getResult;
    option.temp_auth = &tempauth;
    // Download object information.
    obs_object_info object_info;
    memset(&object_info, 0, sizeof(obs_object_info));
    object_info.key =key;
    object_info.version_id = versionid;
    // Local file information after download
    char *file_name = local_file_name;
    get_object_callback_data data;
    data.ret_status = OBS_STATUS_BUTT;
    data.outfile = write_to_file(file_name);
    // Callback function
    obs_get_object_handler getobjectHandler =
    { 
        { &response_properties_callback,
          &get_object_complete_callback},
        &get_object_data_callback
    };    
    // Download an object.
    get_object(&option,&object_info,0,0,&getobjectHandler,&data);
    fclose(data.outfile);
    if (OBS_STATUS_OK == data.ret_status) {printf("the temporary signature url of get object generated successfully. The result is recorded in the tmpAuthUrl.txt file. \n");
    }
    else
    {
         printf("the temporary signature url of get object generation faied(%s).\n", obs_get_status_name(data.ret_status));
    }
}