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/*
This file is part of TALER
Copyright (C) 2016 GNUnet e.V.
TALER 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, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-exchange-httpd_validation.c
* @brief helpers for calling the wire plugins to validate addresses
* @author Christian Grothoff
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler-exchange-httpd_validation.h"
#include "taler_wire_plugin.h"
/**
* Information we keep for each plugin.
*/
struct Plugin
{
/**
* We keep plugins in a DLL.
*/
struct Plugin *next;
/**
* We keep plugins in a DLL.
*/
struct Plugin *prev;
/**
* Type of the wireformat.
*/
char *type;
/**
* Pointer to the plugin.
*/
struct TALER_WIRE_Plugin *plugin;
};
/**
* Head of DLL of wire plugins.
*/
static struct Plugin *wire_head;
/**
* Tail of DLL of wire plugins.
*/
static struct Plugin *wire_tail;
/**
* Initialize validation subsystem.
*
* @param cfg configuration to use
* @return #GNUNET_OK on success
*/
int
TMH_VALIDATION_init (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct Plugin *p;
char *wireformats;
char *lib_name;
const char *token;
/* Find out list of supported wire formats */
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
"exchange",
"wireformat",
&wireformats))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"exchange",
"wireformat");
return GNUNET_SYSERR;
}
for (token = strtok (wireformats,
" ");
NULL != token;
token = strtok (NULL,
" "))
{
(void) GNUNET_asprintf (&lib_name,
"libtaler_plugin_wire_%s",
token);
p = GNUNET_new (struct Plugin);
p->type = GNUNET_strdup (token);
p->plugin = GNUNET_PLUGIN_load (lib_name,
(void *) cfg);
if (NULL == p->plugin)
{
GNUNET_free (p);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to load plugin %s\n",
lib_name);
GNUNET_free (lib_name);
TMH_VALIDATION_done ();
return GNUNET_SYSERR;
}
p->plugin->library_name = lib_name;
GNUNET_CONTAINER_DLL_insert (wire_head,
wire_tail,
p);
}
GNUNET_free (wireformats);
return GNUNET_OK;
}
/**
* Shutdown validation subsystem.
*/
void
TMH_VALIDATION_done ()
{
struct Plugin *p;
char *lib_name;
while (NULL != (p = wire_head))
{
GNUNET_CONTAINER_DLL_remove (wire_head,
wire_tail,
p);
lib_name = p->plugin->library_name;
GNUNET_assert (NULL == GNUNET_PLUGIN_unload (lib_name,
p->plugin));
GNUNET_free (lib_name);
GNUNET_free (p->type);
GNUNET_free (p);
}
}
/**
* Check if the given wire format JSON object is correctly formatted as
* a wire address.
*
* @param wire the JSON wire format object
* @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
*/
int
TMH_json_validate_wireformat (const json_t *wire)
{
const char *stype;
json_error_t error;
struct Plugin *p;
if (0 != json_unpack_ex ((json_t *) wire,
&error, 0,
"{s:s}",
"type", &stype))
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
for (p=wire_head; NULL != p; p = p->next)
if (0 == strcasecmp (p->type,
stype))
return p->plugin->wire_validate (wire);
return GNUNET_NO;
}
/**
* Check if we support the given wire method.
*
* @param type type of wire method to check
* @return #GNUNET_YES if the method is supported
*/
int
TMH_VALIDATION_test_method (const char *type)
{
struct Plugin *p;
for (p=wire_head;NULL != p;p = p->next)
if (0 == strcasecmp (type,
p->type))
return GNUNET_YES;
return GNUNET_NO;
}
/**
* Obtain supported validation methods as a JSON array,
* and as a hash.
*
* @param[out] h set to the hash of the JSON methods
* @return JSON array with the supported validation methods
*/
json_t *
TMH_VALIDATION_get_methods (struct GNUNET_HashCode *h)
{
json_t *methods;
struct GNUNET_HashContext *hc;
const char *wf;
struct Plugin *p;
methods = json_array ();
hc = GNUNET_CRYPTO_hash_context_start ();
for (p=wire_head;NULL != p;p = p->next)
{
wf = p->type;
json_array_append_new (methods,
json_string (wf));
GNUNET_CRYPTO_hash_context_read (hc,
wf,
strlen (wf) + 1);
}
GNUNET_CRYPTO_hash_context_finish (hc,
h);
return methods;
}
/* end of taler-exchange-httpd_validation.c */
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