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/*
* Copyright (C) 2017 Andreas Steffen
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
#ifdef USE_JSON
#define _GNU_SOURCE
#include <stdio.h>
#include "rest.h"
typedef struct private_rest_t private_rest_t;
/**
* Private data of an rest_t object.
*/
struct private_rest_t {
/**
* Public members of rest_t
*/
rest_t public;
/**
* URI of REST API
*/
char *uri;
/**
* Timeout of REST API connection
*/
u_int timeout;
};
METHOD(rest_t, get, status_t,
private_rest_t *this, char *command, json_object **jresponse)
{
struct json_tokener *tokener;
chunk_t response = chunk_empty;
status_t status;
char *uri;
if (asprintf(&uri, "%s%s",this->uri, command) < 0)
{
return FAILED;
}
status = lib->fetcher->fetch(lib->fetcher, uri, &response,
FETCH_TIMEOUT, this->timeout,
FETCH_END);
free(uri);
if (status == SUCCESS && jresponse)
{
/* Parse HTTP response into a JSON object */
tokener = json_tokener_new();
*jresponse = json_tokener_parse_ex(tokener, response.ptr, response.len);
json_tokener_free(tokener);
}
free(response.ptr);
return status;
}
#define HTTP_STATUS_CODE_NOT_FOUND 404
#define HTTP_STATUS_CODE_PRECONDITION_FAILED 412
METHOD(rest_t, post, status_t,
private_rest_t *this, char *command, json_object *jrequest,
json_object **jresponse)
{
struct json_tokener *tokener;
chunk_t data, response = chunk_empty;
status_t status;
char *uri;
int code;
if (asprintf(&uri, "%s%s",this->uri, command) < 0)
{
return FAILED;
}
data = chunk_from_str((char*)json_object_to_json_string(jrequest));
status = lib->fetcher->fetch(lib->fetcher, uri, &response,
FETCH_TIMEOUT, this->timeout,
FETCH_REQUEST_DATA, data,
FETCH_REQUEST_TYPE, "application/json; charset=utf-8",
FETCH_REQUEST_HEADER, "Accept: application/json",
FETCH_REQUEST_HEADER, "Expect:",
FETCH_RESPONSE_CODE, &code,
FETCH_END);
free(uri);
if (status != SUCCESS)
{
switch (code)
{
case HTTP_STATUS_CODE_NOT_FOUND:
status = NOT_FOUND;
break;
case HTTP_STATUS_CODE_PRECONDITION_FAILED:
if (!response.ptr)
{
return FAILED;
}
if (jresponse)
{
/* Parse HTTP response into a JSON object */
tokener = json_tokener_new();
*jresponse = json_tokener_parse_ex(tokener, response.ptr,
response.len);
json_tokener_free(tokener);
}
status = NEED_MORE;
break;
default:
DBG2(DBG_IMV, "REST http request failed with status code: %d",
code);
status = FAILED;
break;
}
}
free(response.ptr);
return status;
}
METHOD(rest_t, destroy, void,
private_rest_t *this)
{
free(this->uri);
free(this);
}
/**
* Described in header.
*/
rest_t *rest_create(char *uri, u_int timeout)
{
private_rest_t *this;
INIT(this,
.public = {
.get = _get,
.post = _post,
.destroy = _destroy,
},
.uri = strdup(uri),
.timeout = timeout,
);
return &this->public;
}
#endif /* USE_JSON */
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