/*
This file is part of GNUnet.
Copyright (C) 2012-2018 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @author Martin Schanzenbach
* @file gns/plugin_rest_config.c
* @brief REST plugin for configuration
*
*/
#include "platform.h"
#include "gnunet_rest_plugin.h"
#include
#include
#include
#define GNUNET_REST_API_NS_CONFIG "/config"
/**
* @brief struct returned by the initialization function of the plugin
*/
struct Plugin
{
const struct GNUNET_CONFIGURATION_Handle *cfg;
};
const struct GNUNET_CONFIGURATION_Handle *cfg;
struct RequestHandle
{
/**
* Handle to rest request
*/
struct GNUNET_REST_RequestHandle *rest_handle;
/**
* The plugin result processor
*/
GNUNET_REST_ResultProcessor proc;
/**
* The closure of the result processor
*/
void *proc_cls;
/**
* HTTP response code
*/
int response_code;
/**
* The URL
*/
char *url;
};
/**
* Cleanup request handle.
*
* @param handle Handle to clean up
*/
static void
cleanup_handle (struct RequestHandle *handle)
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Cleaning up\n");
if (NULL != handle->url)
GNUNET_free (handle->url);
GNUNET_free (handle);
}
/**
* Task run on shutdown. Cleans up everything.
*
* @param cls unused
* @param tc scheduler context
*/
static void
do_error (void *cls)
{
struct RequestHandle *handle = cls;
struct MHD_Response *resp;
resp = GNUNET_REST_create_response (NULL);
handle->proc (handle->proc_cls, resp, handle->response_code);
cleanup_handle (handle);
}
static void
add_sections (void *cls,
const char *section,
const char *option,
const char *value)
{
json_t *sections_obj = cls;
json_t *sec_obj;
sec_obj = json_object_get (sections_obj, section);
if (NULL != sec_obj)
{
json_object_set_new (sec_obj, option, json_string (value));
return;
}
sec_obj = json_object ();
json_object_set_new (sec_obj, option, json_string (value));
json_object_set_new (sections_obj, section, sec_obj);
}
static void
add_section_contents (void *cls,
const char *section,
const char *option,
const char *value)
{
json_t *section_obj = cls;
json_object_set_new (section_obj, option, json_string (value));
}
/**
* Handle rest request
*
* @param handle the lookup handle
*/
static void
get_cont (struct GNUNET_REST_RequestHandle *con_handle,
const char *url,
void *cls)
{
struct MHD_Response *resp;
struct RequestHandle *handle = cls;
const char *section;
char *response;
json_t *result;
if (strlen (GNUNET_REST_API_NS_CONFIG) > strlen (handle->url))
{
handle->response_code = MHD_HTTP_BAD_REQUEST;
GNUNET_SCHEDULER_add_now (&do_error, handle);
return;
}
if (strlen (GNUNET_REST_API_NS_CONFIG) == strlen (handle->url))
{
result = json_object ();
GNUNET_CONFIGURATION_iterate (cfg, &add_sections, result);
}
else
{
result = json_object ();
section = &handle->url[strlen (GNUNET_REST_API_NS_CONFIG) + 1];
GNUNET_CONFIGURATION_iterate_section_values (cfg,
section,
&add_section_contents,
result);
}
response = json_dumps (result, 0);
resp = GNUNET_REST_create_response (response);
handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
cleanup_handle (handle);
GNUNET_free (response);
json_decref (result);
}
/**
* Handle rest request
*
* @param handle the lookup handle
*/
static void
options_cont (struct GNUNET_REST_RequestHandle *con_handle,
const char *url,
void *cls)
{
struct MHD_Response *resp;
struct RequestHandle *handle = cls;
resp = GNUNET_REST_create_response (NULL);
MHD_add_response_header (resp,
"Access-Control-Allow-Methods",
MHD_HTTP_METHOD_GET);
handle->proc (handle->proc_cls, resp, MHD_HTTP_OK);
cleanup_handle (handle);
}
/**
* Function processing the REST call
*
* @param method HTTP method
* @param url URL of the HTTP request
* @param data body of the HTTP request (optional)
* @param data_size length of the body
* @param proc callback function for the result
* @param proc_cls closure for @a proc
* @return #GNUNET_OK if request accepted
*/
static void
rest_config_process_request (struct GNUNET_REST_RequestHandle *conndata_handle,
GNUNET_REST_ResultProcessor proc,
void *proc_cls)
{
static const struct GNUNET_REST_RequestHandler handlers[] = {
{MHD_HTTP_METHOD_GET, GNUNET_REST_API_NS_CONFIG, &get_cont},
{MHD_HTTP_METHOD_OPTIONS, GNUNET_REST_API_NS_CONFIG, &options_cont},
GNUNET_REST_HANDLER_END};
struct RequestHandle *handle = GNUNET_new (struct RequestHandle);
struct GNUNET_REST_RequestHandlerError err;
handle->proc_cls = proc_cls;
handle->proc = proc;
handle->rest_handle = conndata_handle;
handle->url = GNUNET_strdup (conndata_handle->url);
if (handle->url[strlen (handle->url) - 1] == '/')
handle->url[strlen (handle->url) - 1] = '\0';
if (GNUNET_NO ==
GNUNET_REST_handle_request (conndata_handle, handlers, &err, handle))
{
handle->response_code = err.error_code;
GNUNET_SCHEDULER_add_now (&do_error, handle);
}
}
/**
* Entry point for the plugin.
*
* @param cls the "struct GNUNET_NAMESTORE_PluginEnvironment*"
* @return NULL on error, otherwise the plugin context
*/
void *
libgnunet_plugin_rest_config_init (void *cls)
{
static struct Plugin plugin;
cfg = cls;
struct GNUNET_REST_Plugin *api;
if (NULL != plugin.cfg)
return NULL; /* can only initialize once! */
memset (&plugin, 0, sizeof (struct Plugin));
plugin.cfg = cfg;
api = GNUNET_new (struct GNUNET_REST_Plugin);
api->cls = &plugin;
api->name = GNUNET_REST_API_NS_CONFIG;
api->process_request = &rest_config_process_request;
GNUNET_log (GNUNET_ERROR_TYPE_INFO, _ ("CONFIG REST API initialized\n"));
return api;
}
/**
* Exit point from the plugin.
*
* @param cls the plugin context (as returned by "init")
* @return always NULL
*/
void *
libgnunet_plugin_rest_config_done (void *cls)
{
struct GNUNET_REST_Plugin *api = cls;
struct Plugin *plugin = api->cls;
plugin->cfg = NULL;
GNUNET_free (api);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CONFIG REST plugin is finished\n");
return NULL;
}
/* end of plugin_rest_config.c */