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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2013, Digium, Inc.
*
* David M. Lee, II <dlee@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/astobj2.h"
#include "asterisk/stasis_http.h"
/*! \file
*
* \brief WebSocket support for RESTful API's.
* \author David M. Lee, II <dlee@digium.com>
*/
struct ari_websocket_session {
struct ast_websocket *ws_session;
int (*validator)(struct ast_json *);
};
static void websocket_session_dtor(void *obj)
{
struct ari_websocket_session *session = obj;
ast_websocket_unref(session->ws_session);
session->ws_session = NULL;
}
/*!
* \brief Validator that always succeeds.
*/
static int null_validator(struct ast_json *json)
{
return 1;
}
struct ari_websocket_session *ari_websocket_session_create(
struct ast_websocket *ws_session, int (*validator)(struct ast_json *))
{
RAII_VAR(struct ari_websocket_session *, session, NULL, ao2_cleanup);
if (ws_session == NULL) {
return NULL;
}
if (validator == NULL) {
validator = null_validator;
}
if (ast_websocket_set_nonblock(ws_session) != 0) {
ast_log(LOG_ERROR,
"Stasis web socket failed to set nonblock; closing\n");
return NULL;
}
session = ao2_alloc(sizeof(*session), websocket_session_dtor);
if (!session) {
return NULL;
}
ao2_ref(ws_session, +1);
session->ws_session = ws_session;
session->validator = validator;
ao2_ref(session, +1);
return session;
}
struct ast_json *ari_websocket_session_read(
struct ari_websocket_session *session)
{
RAII_VAR(struct ast_json *, message, NULL, ast_json_unref);
while (!message) {
int res;
char *payload;
uint64_t payload_len;
enum ast_websocket_opcode opcode;
int fragmented;
res = ast_wait_for_input(
ast_websocket_fd(session->ws_session), -1);
if (res <= 0) {
return NULL;
}
res = ast_websocket_read(session->ws_session, &payload,
&payload_len, &opcode, &fragmented);
if (res != 0) {
return NULL;
}
switch (opcode) {
case AST_WEBSOCKET_OPCODE_CLOSE:
return NULL;
case AST_WEBSOCKET_OPCODE_TEXT:
message = ast_json_load_buf(payload, payload_len, NULL);
break;
default:
/* Ignore all other message types */
break;
}
}
return ast_json_ref(message);
}
#define VALIDATION_FAILED \
"{ \"error\": \"Outgoing message failed validation\" }"
int ari_websocket_session_write(struct ari_websocket_session *session,
struct ast_json *message)
{
RAII_VAR(char *, str, NULL, ast_free);
#ifdef AST_DEVMODE
if (!session->validator(message)) {
ast_log(LOG_ERROR, "Outgoing message failed validation\n");
return ast_websocket_write(session->ws_session,
AST_WEBSOCKET_OPCODE_TEXT, VALIDATION_FAILED,
strlen(VALIDATION_FAILED));
}
#endif
str = ast_json_dump_string_format(message, stasis_http_json_format());
if (str == NULL) {
ast_log(LOG_ERROR, "Failed to encode JSON object\n");
return -1;
}
return ast_websocket_write(session->ws_session,
AST_WEBSOCKET_OPCODE_TEXT, str, strlen(str));
}
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