/*
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, see
*/
/**
* @file taler-exchange-httpd_validation.c
* @brief helpers for calling the wire plugins to validate addresses
* @author Christian Grothoff
*/
#include "platform.h"
#include
#include "taler-exchange-httpd.h"
#include "taler-exchange-httpd_validation.h"
#include "taler_wire_lib.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
TEH_VALIDATION_init (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct Plugin *p;
char *wireformats;
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,
" "))
{
p = GNUNET_new (struct Plugin);
p->type = GNUNET_strdup (token);
p->plugin = TALER_WIRE_plugin_load (cfg,
token);
if (NULL == p->plugin)
{
GNUNET_free (p);
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to load plugin %s\n",
token);
TEH_VALIDATION_done ();
return GNUNET_SYSERR;
}
GNUNET_CONTAINER_DLL_insert (wire_head,
wire_tail,
p);
}
GNUNET_free (wireformats);
return GNUNET_OK;
}
/**
* Shutdown validation subsystem.
*/
void
TEH_VALIDATION_done ()
{
struct Plugin *p;
while (NULL != (p = wire_head))
{
GNUNET_CONTAINER_DLL_remove (wire_head,
wire_tail,
p);
TALER_WIRE_plugin_unload (p->plugin);
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
* @param ours #GNUNET_YES if the signature should match our master key
* @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
*/
int
TEH_json_validate_wireformat (const json_t *wire,
int ours)
{
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 (p->plugin->cls,
wire,
(GNUNET_YES == ours)
? &TEH_master_public_key
: NULL);
return GNUNET_NO;
}
/**
* Obtain JSON of the supported wire methods for a given
* account name prefix.
*
* @param prefix prefix for the account, the suffix will
* be determined by the name of the plugin
* @return JSON array with the supported validation methods
*/
json_t *
TEH_VALIDATION_get_wire_methods (const char *prefix)
{
json_t *methods;
json_t *method;
struct Plugin *p;
struct TALER_WIRE_Plugin *plugin;
char *account_name;
methods = json_object ();
for (p=wire_head;NULL != p;p = p->next)
{
plugin = p->plugin;
GNUNET_asprintf (&account_name,
"%s-%s",
prefix,
p->type);
method = plugin->get_wire_details (plugin->cls,
cfg,
account_name);
if (GNUNET_YES !=
TEH_json_validate_wireformat (method,
GNUNET_YES))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Account details for method `%s' ill-formed. Disabling method\n",
p->type);
json_decref (method);
method = NULL;
}
if (NULL != method)
json_object_set_new (methods,
p->type,
method);
GNUNET_free (account_name);
}
return methods;
}
/* end of taler-exchange-httpd_validation.c */