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examples: Add Identify example
It was the only main action left in the examples, we use the gallery from the device if available, otherwise the local one.
This commit is contained in:
Marco Trevisan (Treviño)
committed by
Benjamin Berg
Benjamin Berg
parent
21ee241f0c
commit
fb5854213a
296
examples/identify.c
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296
examples/identify.c
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/*
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* Example fingerprint verification program, which verifies the
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* finger which has been previously enrolled to disk.
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* Copyright (C) 2020 Marco Trevisan <marco.trevisan@canonical.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define FP_COMPONENT "example-identify"
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#include <stdio.h>
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#include <libfprint/fprint.h>
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#include <glib-unix.h>
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#include "storage.h"
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#include "utilities.h"
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typedef struct _IdentifyData
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{
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GMainLoop *loop;
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GCancellable *cancellable;
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unsigned int sigint_handler;
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int ret_value;
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} IdentifyData;
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static void
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identify_data_free (IdentifyData *identify_data)
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{
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g_clear_handle_id (&identify_data->sigint_handler, g_source_remove);
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g_clear_object (&identify_data->cancellable);
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g_main_loop_unref (identify_data->loop);
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g_free (identify_data);
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}
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G_DEFINE_AUTOPTR_CLEANUP_FUNC (IdentifyData, identify_data_free)
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static void
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on_device_closed (FpDevice *dev, GAsyncResult *res, void *user_data)
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{
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IdentifyData *identify_data = user_data;
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g_autoptr(GError) error = NULL;
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fp_device_close_finish (dev, res, &error);
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if (error)
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g_warning ("Failed closing device %s", error->message);
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g_main_loop_quit (identify_data->loop);
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}
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static void
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identify_quit (FpDevice *dev,
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IdentifyData *identify_data)
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{
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if (!fp_device_is_open (dev))
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{
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g_main_loop_quit (identify_data->loop);
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return;
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}
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fp_device_close (dev, NULL, (GAsyncReadyCallback) on_device_closed, identify_data);
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}
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static void start_identification (FpDevice *dev,
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IdentifyData *identify_data);
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static void
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on_identify_completed (FpDevice *dev, GAsyncResult *res, void *user_data)
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{
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IdentifyData *identify_data = user_data;
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g_autoptr(FpPrint) print = NULL;
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g_autoptr(FpPrint) match = NULL;
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g_autoptr(GError) error = NULL;
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char buffer[20];
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if (!fp_device_identify_finish (dev, res, &match, &print, &error))
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{
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g_warning ("Failed to identify print: %s", error->message);
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identify_data->ret_value = EXIT_FAILURE;
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if (error->domain != FP_DEVICE_RETRY)
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{
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identify_quit (dev, identify_data);
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return;
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}
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}
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g_print ("Identify again? [Y/n]? ");
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if (fgets (buffer, sizeof (buffer), stdin) &&
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(buffer[0] == 'Y' || buffer[0] == 'y' || buffer[0] == '\n'))
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{
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start_identification (dev, identify_data);
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return;
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}
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identify_quit (dev, identify_data);
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}
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static void
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on_identify_cb (FpDevice *dev, FpPrint *match, FpPrint *print,
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gpointer user_data, GError *error)
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{
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IdentifyData *identify_data = user_data;
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if (error)
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{
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g_warning ("Identify report: No finger matched, retry error reported: %s",
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error->message);
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return;
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}
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if (print && fp_print_get_image (print) &&
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print_image_save (print, "identify.pgm"))
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g_print ("Print image saved as identify.pgm\n");
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if (match)
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{
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char date_str[128] = {};
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identify_data->ret_value = EXIT_SUCCESS;
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if (fp_print_get_enroll_date (match))
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g_date_strftime (date_str, G_N_ELEMENTS (date_str), "%Y-%m-%d\0",
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fp_print_get_enroll_date (match));
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else
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strcpy (date_str, "<unknown>");
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g_debug ("Identify report: device %s matched finger %s successfully "
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"with print '%s', enrolled on date %s by user %s",
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fp_device_get_name (dev),
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finger_to_string (fp_print_get_finger (match)),
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fp_print_get_description (match), date_str,
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fp_print_get_username (match));
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g_print ("IDENTIFIED!\n");
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}
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else
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{
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g_debug ("Identification report: No finger matched");
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g_print ("NOT IDENTIFIED!\n");
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}
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}
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static void
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on_list_completed (FpDevice *dev, GAsyncResult *res, gpointer user_data)
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{
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IdentifyData *identify_data = user_data;
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g_autoptr(GPtrArray) gallery = NULL;
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g_autoptr(GError) error = NULL;
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gallery = fp_device_list_prints_finish (dev, res, &error);
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if (!error)
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{
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if (!gallery->len)
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{
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g_warning ("No prints saved on device");
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identify_quit (dev, identify_data);
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return;
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}
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g_debug ("Identifying with %u prints in gallery", gallery->len);
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fp_device_identify (dev, gallery, identify_data->cancellable,
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on_identify_cb, identify_data, NULL,
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(GAsyncReadyCallback) on_identify_completed,
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identify_data);
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}
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else
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{
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g_warning ("Loading prints failed with error %s", error->message);
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identify_quit (dev, identify_data);
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}
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}
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static void
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start_identification (FpDevice *dev, IdentifyData *identify_data)
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{
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if (fp_device_has_storage (dev))
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{
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g_print ("Creating finger template, using device storage...\n");
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fp_device_list_prints (dev, NULL,
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(GAsyncReadyCallback) on_list_completed,
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identify_data);
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}
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else
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{
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g_autoptr(GPtrArray) gallery = gallery_data_load (dev);
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if (!gallery)
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{
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identify_quit (dev, identify_data);
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return;
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}
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g_print ("Gallery loaded. Time to identify!\n");
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fp_device_identify (dev, gallery, identify_data->cancellable,
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on_identify_cb, identify_data, NULL,
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(GAsyncReadyCallback) on_identify_completed,
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identify_data);
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}
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}
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static void
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on_device_opened (FpDevice *dev, GAsyncResult *res, void *user_data)
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{
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IdentifyData *identify_data = user_data;
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g_autoptr(GError) error = NULL;
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if (!fp_device_open_finish (dev, res, &error))
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{
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g_warning ("Failed to open device: %s", error->message);
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identify_quit (dev, identify_data);
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return;
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}
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g_print ("Opened device. ");
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start_identification (dev, identify_data);
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}
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static gboolean
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sigint_cb (void *user_data)
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{
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IdentifyData *identify_data = user_data;
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g_cancellable_cancel (identify_data->cancellable);
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return G_SOURCE_CONTINUE;
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}
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int
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main (void)
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{
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g_autoptr(FpContext) ctx = NULL;
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g_autoptr(IdentifyData) identify_data = NULL;
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GPtrArray *devices;
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FpDevice *dev;
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setenv ("G_MESSAGES_DEBUG", "all", 0);
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setenv ("LIBUSB_DEBUG", "3", 0);
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ctx = fp_context_new ();
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devices = fp_context_get_devices (ctx);
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if (!devices)
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{
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g_warning ("Impossible to get devices");
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return EXIT_FAILURE;
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}
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dev = discover_device (devices);
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if (!dev)
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{
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g_warning ("No devices detected.");
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return EXIT_FAILURE;
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}
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if (!fp_device_supports_identify (dev))
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{
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g_warning ("Device %s does not support identification.",
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fp_device_get_name (dev));
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return EXIT_FAILURE;
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}
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identify_data = g_new0 (IdentifyData, 1);
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identify_data->ret_value = EXIT_FAILURE;
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identify_data->loop = g_main_loop_new (NULL, FALSE);
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identify_data->cancellable = g_cancellable_new ();
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identify_data->sigint_handler = g_unix_signal_add_full (G_PRIORITY_HIGH,
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SIGINT,
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sigint_cb,
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identify_data,
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NULL);
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fp_device_open (dev, identify_data->cancellable,
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(GAsyncReadyCallback) on_device_opened,
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identify_data);
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g_main_loop_run (identify_data->loop);
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return identify_data->ret_value;
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}
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