examples: Add manage-prints test to list and delete prints

Simple example program to list prints in a device with own storage and that
allow to delete them (by manual selection or full deletion).
This commit is contained in:
Marco Trevisan (Treviño) 2019-11-19 20:21:03 +01:00 committed by Benjamin Berg
parent ad920f9597
commit d91ec2d044

327
examples/manage-prints.c Normal file
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/*
* Example fingerprint device prints listing and deletion
* Enrolls your right index finger and saves the print to disk
* Copyright (C) 2019 Marco Trevisan <marco.trevisan@canonical.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <libfprint/fprint.h>
typedef struct _ListData
{
GMainLoop *loop;
int ret_value;
GList *to_delete;
gboolean any_failed;
} ListData;
static void
list_data_free (ListData *list_data)
{
g_list_free_full (list_data->to_delete, g_object_unref);
g_main_loop_unref (list_data->loop);
g_free (list_data);
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC (ListData, list_data_free)
FpDevice *discover_device (GPtrArray * devices)
{
FpDevice *dev;
if (!devices->len)
return NULL;
dev = g_ptr_array_index (devices, 0);
g_print ("Found device claimed by %s driver\n", fp_device_get_driver (dev));
return dev;
}
static void
on_device_closed (FpDevice *dev,
GAsyncResult *res,
gpointer user_data)
{
ListData *list_data = user_data;
g_autoptr(GError) error = NULL;
fp_device_close_finish (dev, res, &error);
if (error)
g_warning ("Failed closing device %s\n", error->message);
g_main_loop_quit (list_data->loop);
}
const char *
finger_to_string (FpFinger finger)
{
switch (finger)
{
case FP_FINGER_LEFT_THUMB:
return "left thumb";
case FP_FINGER_LEFT_INDEX:
return "left index";
case FP_FINGER_LEFT_MIDDLE:
return "left middle";
case FP_FINGER_LEFT_RING:
return "left ring";
case FP_FINGER_LEFT_LITTLE:
return "left little";
case FP_FINGER_RIGHT_THUMB:
return "right thumb";
case FP_FINGER_RIGHT_INDEX:
return "right index";
case FP_FINGER_RIGHT_MIDDLE:
return "right middle";
case FP_FINGER_RIGHT_RING:
return "right ring";
case FP_FINGER_RIGHT_LITTLE:
return "right little";
default:
return "unknown";
}
}
typedef struct _DeleteData
{
ListData *list_data;
FpPrint *print;
} DeleteData;
static void
delete_data_free (DeleteData *delete_data)
{
g_object_unref (delete_data->print);
g_free (delete_data);
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC (DeleteData, delete_data_free);
static void
on_print_deleted (FpDevice *dev, GAsyncResult *res, gpointer user_data);
static void
delete_next_print (FpDevice *dev,
ListData *list_data)
{
FpPrint *print;
g_assert_nonnull (list_data->to_delete);
print = list_data->to_delete->data;
g_debug ("Deleting print %s\n", fp_print_get_description (print));
fp_device_delete_print (dev, print, NULL,
(GAsyncReadyCallback) on_print_deleted, list_data);
}
static void
on_print_deleted (FpDevice *dev,
GAsyncResult *res,
gpointer user_data)
{
ListData *list_data = user_data;
g_autoptr(GError) error = NULL;
g_autoptr(FpPrint) print = NULL;
GList *deleted_link;
fp_device_delete_print_finish (dev, res, &error);
deleted_link = list_data->to_delete;
print = g_steal_pointer (&deleted_link->data);
list_data->to_delete = g_list_delete_link (list_data->to_delete, deleted_link);
if (error)
{
g_warning("Failed to remove print %s: %s",
fp_print_get_description (print), error->message);
list_data->any_failed = TRUE;
}
else
g_debug ("Deleted print %s from device", fp_print_get_description (print));
if (list_data->to_delete != NULL)
{
delete_next_print (dev, list_data);
}
else
{
if (!list_data->any_failed)
list_data->ret_value = EXIT_SUCCESS;
fp_device_close (dev, NULL, (GAsyncReadyCallback) on_device_closed,
list_data);
}
}
static void
on_list_completed (FpDevice *dev,
GAsyncResult *res,
gpointer user_data)
{
ListData *list_data = user_data;
g_autoptr(GPtrArray) prints = NULL;
g_autoptr(GError) error = NULL;
prints = fp_device_list_prints_finish (dev, res, &error);
if (!error)
{
guint i;
char buf[128];
g_print ("Device contains %u prints\n", prints->len);
for (i = 0; i < prints->len; ++i)
{
FpPrint* print = prints->pdata[i];
g_date_strftime (buf, G_N_ELEMENTS (buf), "%Y-%m-%d",
fp_print_get_enroll_date (print));
g_print ("[%d] Print of %s finger for username %s, enrolled "
"on %s. Description: %s\n", i + 1,
finger_to_string (fp_print_get_finger (print)),
fp_print_get_username (print), buf,
fp_print_get_description (print));
}
if (prints->len)
{
gint64 idx = 0;
g_print ("Want to delete saved print? [<number>/A/n]\n");
if (fgets (buf, 3, stdin))
idx = g_ascii_strtoll (buf, NULL, 10);
if (idx > 0 && idx <= prints->len)
{
FpPrint *print = prints->pdata[idx - 1];
list_data->to_delete = g_list_prepend (list_data->to_delete,
g_object_ref (print));
}
else if (buf[0] == 'A')
{
for (i = 0; i < prints->len; ++i)
{
FpPrint *print = prints->pdata[i];
list_data->to_delete = g_list_prepend (list_data->to_delete,
g_object_ref (print));
}
}
else
{
if (buf[0] == 'n' || buf[0] == 'N')
list_data->ret_value = EXIT_SUCCESS;
else
g_warning ("Invalid finger selected");
fp_device_close (dev, NULL, (GAsyncReadyCallback) on_device_closed,
list_data);
}
}
if (list_data->to_delete)
delete_next_print (dev, list_data);
else
{
fp_device_close (dev, NULL, (GAsyncReadyCallback) on_device_closed,
list_data);
}
}
else
{
g_warning ("Getting prints failed with error %s", error->message);
g_main_loop_quit (list_data->loop);
}
}
static void
on_device_opened (FpDevice *dev,
GAsyncResult *res,
gpointer user_data)
{
ListData *list_data = user_data;
g_autoptr(GError) error = NULL;
if (!fp_device_open_finish (dev, res, &error))
{
g_warning ("Failed to open device: %s", error->message);
g_main_loop_quit (list_data->loop);
return;
}
if (!fp_device_has_storage (dev))
{
g_warning ("Device %s doesn't support storage", fp_device_get_name (dev));
g_main_loop_quit (list_data->loop);
return;
}
fp_device_list_prints (dev, NULL,
(GAsyncReadyCallback) on_list_completed, list_data);
}
int
main (void)
{
g_autoptr(FpContext) ctx = NULL;
g_autoptr(ListData) list_data = NULL;
GPtrArray *devices;
FpDevice *dev;
g_print ("This program will report the prints saved in device\n");
setenv ("G_MESSAGES_DEBUG", "all", 0);
ctx = fp_context_new ();
devices = fp_context_get_devices (ctx);
if (!devices)
{
g_warning ("Impossible to get devices");
return EXIT_FAILURE;
}
dev = discover_device (devices);
if (!dev)
{
g_warning ("No devices detected.");
return EXIT_FAILURE;
}
list_data = g_new0 (ListData, 1);
list_data->ret_value = EXIT_FAILURE;
list_data->loop = g_main_loop_new (NULL, FALSE);
fp_device_open (dev, NULL, (GAsyncReadyCallback) on_device_opened, list_data);
g_main_loop_run (list_data->loop);
return list_data->ret_value;
}