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-rw-r--r--binding/afm-geofence-binding.c342
1 files changed, 342 insertions, 0 deletions
diff --git a/binding/afm-geofence-binding.c b/binding/afm-geofence-binding.c
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+++ b/binding/afm-geofence-binding.c
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+/*
+ * Copyright (C) 2017 Konsulko Group
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * TODO: add support for geoclue binding location data
+ */
+
+#define _GNU_SOURCE
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <glib.h>
+#include <glib-object.h>
+#include <json-c/json.h>
+
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+
+static struct afb_event fence_event;
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+static GList *fences = NULL;
+
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(void *))
+
+/*
+ * @name - geofence name
+ * @triggered - geofence is currently triggered
+ * @bbox - struct of bounding box coordinates
+ */
+struct geofence {
+ gchar *name;
+ bool triggered;
+ struct {
+ double min_latitude, max_latitude;
+ double min_longitude, max_longitude;
+ } bbox;
+};
+
+const char *points[] = {
+ "min_latitude",
+ "max_latitude",
+ "min_longitude",
+ "max_longitude",
+};
+
+static void subscribe(struct afb_req request)
+{
+ const char *value = afb_req_value(request, "value");
+
+ if (value && !strcasecmp(value, "fence")) {
+ afb_req_subscribe(request, fence_event);
+ afb_req_success(request, NULL, NULL);
+ return;
+ }
+
+ afb_req_fail(request, "failed", "invalid event");
+}
+
+static void unsubscribe(struct afb_req request)
+{
+ const char *value = afb_req_value(request, "value");
+
+ if (value && !strcasecmp(value, "fence")) {
+ afb_req_unsubscribe(request, fence_event);
+ afb_req_success(request, NULL, NULL);
+ return;
+ }
+
+ afb_req_fail(request, "failed", "invalid event");
+}
+
+static inline bool within_bounding_box(double latitude, double longitude,
+ struct geofence *fence)
+{
+ if (latitude < fence->bbox.min_latitude)
+ return false;
+
+ if (latitude > fence->bbox.max_latitude)
+ return false;
+
+ if (longitude < fence->bbox.min_longitude)
+ return false;
+
+ if (longitude > fence->bbox.max_longitude)
+ return false;
+
+ return true;
+}
+
+static int parse_bounding_box(const char *data, struct geofence *fence)
+{
+ json_object *jquery = json_tokener_parse(data);
+ json_object *val = NULL;
+ double *bbox = (double *) &fence->bbox;
+ int ret = -EINVAL, i;
+
+ if (jquery == NULL)
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(points); i++) {
+ ret = json_object_object_get_ex(jquery, points[i], &val);
+ if (!ret) {
+ ret = -EINVAL;
+ break;
+ }
+
+ *bbox++ = json_object_get_double(val);
+ }
+
+ json_object_put(jquery);
+
+ if (fence->bbox.min_latitude > fence->bbox.max_latitude)
+ return -EINVAL;
+
+ if (fence->bbox.min_longitude > fence->bbox.max_longitude)
+ return -EINVAL;
+
+ return ret;
+}
+
+static void add_fence(struct afb_req request)
+{
+ const char *name = afb_req_value(request, "name");
+ const char *bbox = afb_req_value(request, "bbox");
+ struct geofence *fence;
+ GList *l;
+ int ret;
+
+ if (!name) {
+ afb_req_fail(request, "failed", "invalid name parameter");
+ return;
+ }
+
+ if (!bbox) {
+ afb_req_fail(request, "failed", "no bbox parameter found");
+ return;
+ }
+
+ fence = g_try_malloc0(sizeof(struct geofence));
+ if (fence == NULL) {
+ afb_req_fail(request, "failed", "cannot allocate memory");
+ return;
+ }
+
+ ret = parse_bounding_box(bbox, fence);
+ if (ret < 0) {
+ afb_req_fail(request, "failed", "invalid bounding box");
+ g_free(fence);
+ return;
+ }
+
+ pthread_mutex_lock(&mutex);
+
+ for (l = fences; l; l = l->next) {
+ struct geofence *g = l->data;
+
+ if (g_strcmp0(g->name, name) == 0) {
+ g_free(fence);
+ pthread_mutex_unlock(&mutex);
+
+ afb_req_fail(request, "failed", "fence with name exists");
+ return;
+ }
+ }
+
+ fence->name = g_strdup(name);
+ fences = g_list_append(fences, fence);
+
+ pthread_mutex_unlock(&mutex);
+
+ afb_req_success(request, NULL, NULL);
+}
+
+static void remove_fence(struct afb_req request)
+{
+ const char *name = afb_req_value(request, "name");
+ GList *l;
+
+ if (!name) {
+ afb_req_fail(request, "failed", "invalid id parameter");
+ return;
+ }
+
+ pthread_mutex_lock(&mutex);
+
+ for (l = fences; l; l = l->next) {
+ struct geofence *g = l->data;
+
+ if (g_strcmp0(g->name, name) == 0) {
+ fences = g_list_remove(fences, g);
+ g_free(g->name);
+ g_free(g);
+
+ pthread_mutex_unlock(&mutex);
+
+ afb_req_success(request, NULL, "removed fence");
+ return;
+ }
+ }
+
+ pthread_mutex_unlock(&mutex);
+
+ afb_req_fail(request, "failed", "fence not found for removal");
+}
+
+static void list_fences(struct afb_req request)
+{
+ json_object *jresp = json_object_new_object();
+ GList *l;
+
+ pthread_mutex_lock(&mutex);
+
+ for (l = fences; l; l = l->next)
+ {
+ json_object *json_bbox = json_object_new_object();
+ json_object *item = json_object_new_object();
+ struct geofence *g = l->data;
+ double *bbox = (double *) &g->bbox;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(points); i++) {
+ json_object_object_add(json_bbox, points[i],
+ json_object_new_double(*bbox++));
+ }
+
+ json_object_object_add(item, "within",
+ json_object_new_boolean(g->triggered));
+ json_object_object_add(item, "bbox", json_bbox);
+ json_object_object_add(jresp, g->name, item);
+ }
+
+ pthread_mutex_unlock(&mutex);
+
+ afb_req_success(request, jresp, "list of geofences");
+}
+
+static int init()
+{
+ json_object *response, *query;
+ int ret;
+
+ ret = afb_daemon_require_api("gps", 1);
+ if (ret < 0) {
+ AFB_ERROR("Cannot request gps service");
+ return ret;
+ }
+
+ query = json_object_new_object();
+ json_object_object_add(query, "value", json_object_new_string("location"));
+
+ ret = afb_service_call_sync("gps", "subscribe", query, &response);
+ json_object_put(response);
+
+ if (ret < 0) {
+ AFB_ERROR("Cannot subscribe to gps service");
+ return ret;
+ }
+
+ fence_event = afb_daemon_make_event("fence");
+
+ return 0;
+}
+
+static void onevent(const char *event, struct json_object *object)
+{
+ json_object *val = NULL;
+ double latitude, longitude;
+ GList *l;
+ int ret;
+
+ if (g_strcmp0(event, "gps/location"))
+ return;
+
+ ret = json_object_object_get_ex(object, "latitude", &val);
+ if (!ret)
+ return;
+ latitude = json_object_get_double(val);
+
+ ret = json_object_object_get_ex(object, "longitude", &val);
+ if (!ret)
+ return;
+ longitude = json_object_get_double(val);
+
+ pthread_mutex_lock(&mutex);
+
+ for (l = fences; l; l = l->next) {
+ struct geofence *g = (struct geofence *) l->data;
+ struct json_object *jresp;
+ bool current = within_bounding_box(latitude, longitude, g);
+
+ if (current == g->triggered)
+ continue;
+
+ jresp = json_object_new_object();
+ g->triggered = current;
+
+ json_object_object_add(jresp, "name",
+ json_object_new_string(g->name));
+ json_object_object_add(jresp, "state",
+ json_object_new_string(current ? "entered" : "exited"));
+
+ afb_event_push(fence_event, jresp);
+ }
+
+ pthread_mutex_unlock(&mutex);
+}
+
+static const struct afb_verb_v2 binding_verbs[] = {
+ { .verb = "subscribe", .callback = subscribe, .info = "Subscribe to geofence events" },
+ { .verb = "unsubscribe", .callback = unsubscribe, .info = "Unsubscribe to geofence events" },
+ { .verb = "add_fence", .callback = add_fence, .info = "Add geofence" },
+ { .verb = "remove_fence", .callback = remove_fence, .info = "Remove geofence" },
+ { .verb = "list_fences", .callback = list_fences, .info = "List all curent geofences" },
+ { }
+};
+
+/*
+ * binder API description
+ */
+const struct afb_binding_v2 afbBindingV2 = {
+ .api = "geofence",
+ .specification = "Geofence service API",
+ .verbs = binding_verbs,
+ .init = init,
+ .onevent = onevent,
+};