rest: Add /center/info

Add URI to allow a GET request to obtain info about a center (name, id
and comment of the center as of now).

To use this uri, simply send a GET request with a json containing the id
of the center whose info needs to be consulted:

curl -X GET -H "Authorization: $API_KEY" http://127.0.0.1:8888/center/info -d '{"id":1}'

based on work from Javier Hernandez.

src/dbi.c

@@ -129,6 +129,39 @@ int og_dbi_get_computer_info(struct og_dbi *dbi, struct og_computer *computer,
 	return 0;
 }
 
+int og_dbi_get_center_info(struct og_dbi *dbi, struct og_center *center)
+{
+	const char *msglog;
+	dbi_result result;
+
+	result = dbi_conn_queryf(dbi->conn,
+				 "SELECT nombrecentro, idcentro, comentarios "
+				 "FROM centros WHERE idcentro=%d",
+				 center->id);
+	if (!result) {
+		dbi_conn_error(dbi->conn, &msglog);
+		syslog(LOG_ERR, "failed to query database (%s:%d) %s\n",
+		       __func__, __LINE__, msglog);
+		return -1;
+	}
+
+	if (!dbi_result_next_row(result)) {
+		syslog(LOG_ERR, "center does not exist in database (%s:%d)\n",
+		       __func__, __LINE__);
+		dbi_result_free(result);
+		return -1;
+	}
+
+	snprintf(center->name, sizeof(center->name), "%s",
+		 dbi_result_get_string(result, "nombrecentro"));
+	snprintf(center->comment, sizeof(center->comment), "%s",
+		 dbi_result_get_string(result, "comentarios"));
+
+	dbi_result_free(result);
+
+	return 0;
+}
+
 int og_dbi_get_room_info(struct og_dbi *dbi, struct og_room *room,
 			 uint32_t room_id)
 {

src/dbi.h

@@ -41,6 +41,7 @@ void og_dbi_close(struct og_dbi *db);
 #define OG_DB_MAC_MAXLEN	15
 #define OG_DB_IP_MAXLEN		15
 #define OG_DB_SMALLINT_MAXLEN	6
+#define OG_DB_COMMENT_MAXLEN	250
 
 struct og_image_legacy {
 	char software_id[OG_DB_INT_MAXLEN + 1];
@@ -110,6 +111,12 @@ struct og_room {
 	bool		remote;
 };
 
+struct og_center {
+	uint32_t	id;
+	char		name[OG_DB_CENTER_NAME_MAXLEN + 1];
+	char		comment[OG_DB_COMMENT_MAXLEN + 1];
+};
+
 struct og_folder {
 	unsigned int	id;
 	unsigned int	room;
@@ -128,6 +135,7 @@ int og_dbi_get_computer_info(struct og_dbi *dbi, struct og_computer *computer,
 			     struct in_addr addr);
 int og_dbi_get_room_info(struct og_dbi *dbi, struct og_room *room,
 			 uint32_t room_id);
+int og_dbi_get_center_info(struct og_dbi *dbi, struct og_center *center);
 bool og_dbi_get_image(struct og_dbi *dbi, struct og_image *image);
 int og_dbi_add_image(struct og_dbi *dbi, struct og_image *image);
 

src/rest.c

@@ -1670,6 +1670,64 @@ static int og_cmd_post_client_server(json_t *element,
 	return 0;
 }
 
+static int og_cmd_get_center_info(json_t *element,
+				  struct og_msg_params *params,
+				  char *buffer_reply)
+{
+	struct og_center center = {};
+	json_t *value, *root;
+	struct og_dbi *dbi;
+	const char *key;
+	int err = 0;
+
+	struct og_buffer og_buffer = {
+		.data = buffer_reply
+	};
+
+	json_object_foreach(element, key, value) {
+		if (!strcmp(key, "id")) {
+			err = og_json_parse_uint(value, &center.id);
+			params->flags |= OG_REST_PARAM_CENTER;
+		}
+		if (err < 0)
+			return err;
+	}
+	if (!og_msg_params_validate(params, OG_REST_PARAM_CENTER))
+		return -1;
+
+	dbi = og_dbi_open(&ogconfig.db);
+	if (!dbi) {
+		syslog(LOG_ERR, "cannot open conection database (%s:%d)\n",
+		       __func__, __LINE__);
+		return -1;
+	}
+
+	if (og_dbi_get_center_info(dbi, &center)) {
+		og_dbi_close(dbi);
+		return -1;
+	}
+	og_dbi_close(dbi);
+
+	root = json_object();
+	if (!root)
+		return -1;
+
+	json_object_set_new(root, "comment",
+			    json_string(center.comment));
+	json_object_set_new(root, "id",
+			    json_integer(center.id));
+	json_object_set_new(root, "name",
+			    json_string(center.name));
+
+	if (json_dump_callback(root, og_json_dump_clients, &og_buffer, 0)) {
+		json_decref(root);
+		return -1;
+	}
+
+	json_decref(root);
+	return 0;
+}
+
 static int og_cmd_get_client_info(json_t *element,
 				  struct og_msg_params *params,
 				  char *buffer_reply)
@@ -7510,6 +7568,7 @@ struct {
 	[OG_URI_CENTER_ADD]	= { "center/add", },
 	[OG_URI_CENTER_UPDATE]	= { "center/update", },
 	[OG_URI_CENTER_DELETE]	= { "center/delete", },
+	[OG_URI_CENTER_INFO]	= { "center/info", },
 	[OG_URI_ROOM_ADD]	= { "room/add", },
 	[OG_URI_ROOM_UPDATE]	= { "room/update", },
 	[OG_URI_ROOM_DELETE]	= { "room/delete", },
@@ -8222,6 +8281,20 @@ int og_client_state_process_payload_rest(struct og_client *cli)
 			goto err_process_rest_payload;
 		}
 		err = og_cmd_post_center_delete(root, &params);
+	} else if (!strncmp(cmd, "center/info",
+			    strlen("center/info"))) {
+		if (method != OG_METHOD_GET) {
+			err = og_client_method_not_found(cli);
+			goto err_process_rest_payload;
+		}
+		if (!root) {
+			syslog(LOG_ERR,
+			       "command client info with no payload\n");
+			err = og_client_bad_request(cli);
+			goto err_process_rest_payload;
+		}
+
+		err = og_cmd_get_center_info(root, &params, buf_reply);
 	} else if (!strncmp(cmd, "center/update", strlen("center/update"))) {
 		if (method != OG_METHOD_POST) {
 			err = og_client_method_not_found(cli);

src/rest.h

@@ -131,6 +131,7 @@ enum og_rest_uri {
 	OG_URI_CENTER_ADD,
 	OG_URI_CENTER_UPDATE,
 	OG_URI_CENTER_DELETE,
+	OG_URI_CENTER_INFO,
 	OG_URI_ROOM_ADD,
 	OG_URI_ROOM_UPDATE,
 	OG_URI_ROOM_DELETE,