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/*
This file is part of GNUnet
Copyright (C) 2020 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 <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @author Johannes Späth
* @file escrow/escrow_plugin.c
*
* @brief helper functions for escrow plugins
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_identity_service.h"
#include "gnunet_escrow_plugin.h"
/**
* Maintains the ego list for an escrow plugin.
* This function is an implementation of GNUNET_IDENTITY_Callback.
*
* It is initially called for all egos and then again
* whenever a ego's identifier changes or if it is deleted. At the
* end of the initial pass over all egos, the function is once called
* with 'NULL' for 'ego'. That does NOT mean that the callback won't
* be invoked in the future or that there was an error.
*
* When used with 'GNUNET_IDENTITY_create' or 'GNUNET_IDENTITY_get',
* this function is only called ONCE, and 'NULL' being passed in
* 'ego' does indicate an error (i.e. name is taken or no default
* value is known). If 'ego' is non-NULL and if '*ctx'
* is set in those callbacks, the value WILL be passed to a subsequent
* call to the identity callback of 'GNUNET_IDENTITY_connect' (if
* that one was not NULL).
*
* When an identity is renamed, this function is called with the
* (known) ego but the NEW identifier.
*
* When an identity is deleted, this function is called with the
* (known) ego and "NULL" for the 'identifier'. In this case,
* the 'ego' is henceforth invalid (and the 'ctx' should also be
* cleaned up).
*
* @param cls plugin handle
* @param ego ego handle
* @param ctx context for application to store data for this ego
* (during the lifetime of this process, initially NULL)
* @param identifier identifier assigned by the user for this ego,
* NULL if the user just deleted the ego and it
* must thus no longer be used
*/
void
ESCROW_list_ego (void *cls,
struct GNUNET_IDENTITY_Ego *ego,
void **ctx,
const char *identifier)
{
struct EgoEntry *ego_entry;
struct GNUNET_CRYPTO_EcdsaPublicKey pk;
struct EscrowPluginHandle *ph = cls;
if ((NULL == ego) && (ESCROW_PLUGIN_STATE_INIT == ph->state))
{
ph->state = ESCROW_PLUGIN_STATE_POST_INIT;
/* call ContinueIdentityInitFunction */
ph->cont ();
return;
}
GNUNET_assert (NULL != ego);
if (ESCROW_PLUGIN_STATE_INIT == ph->state)
{
ego_entry = GNUNET_new (struct EgoEntry);
GNUNET_IDENTITY_ego_get_public_key (ego, &pk);
ego_entry->keystring = GNUNET_CRYPTO_ecdsa_public_key_to_string (&pk);
ego_entry->ego = ego;
ego_entry->identifier = GNUNET_strdup (identifier);
GNUNET_CONTAINER_DLL_insert_tail (ph->ego_head,
ph->ego_tail,
ego_entry);
return;
}
/* Ego renamed or added */
if (identifier != NULL)
{
for (ego_entry = ph->ego_head; NULL != ego_entry;
ego_entry = ego_entry->next)
{
if (ego_entry->ego == ego)
{
/* Rename */
GNUNET_free (ego_entry->identifier);
ego_entry->identifier = GNUNET_strdup (identifier);
break;
}
}
if (NULL == ego_entry)
{
/* Add */
ego_entry = GNUNET_new (struct EgoEntry);
GNUNET_IDENTITY_ego_get_public_key (ego, &pk);
ego_entry->keystring = GNUNET_CRYPTO_ecdsa_public_key_to_string (&pk);
ego_entry->ego = ego;
ego_entry->identifier = GNUNET_strdup (identifier);
GNUNET_CONTAINER_DLL_insert_tail (ph->ego_head,
ph->ego_tail,
ego_entry);
}
}
else
{
/* Delete */
for (ego_entry = ph->ego_head; NULL != ego_entry;
ego_entry = ego_entry->next)
{
if (ego_entry->ego == ego)
break;
}
if (NULL == ego_entry)
return; /* Not found */
GNUNET_CONTAINER_DLL_remove (ph->ego_head,
ph->ego_tail,
ego_entry);
GNUNET_free (ego_entry->identifier);
GNUNET_free (ego_entry->keystring);
GNUNET_free (ego_entry);
return;
}
}
/**
* Cleanup the ego list of an escrow plugin.
*
* @param ph handle for the plugin
*/
void
ESCROW_cleanup_ego_list (struct EscrowPluginHandle *ph)
{
struct EgoEntry *ego_entry;
while (NULL != (ego_entry = ph->ego_head))
{
GNUNET_CONTAINER_DLL_remove (ph->ego_head, ph->ego_tail, ego_entry);
GNUNET_free (ego_entry->identifier);
GNUNET_free (ego_entry->keystring);
GNUNET_free (ego_entry);
}
}
/* end of escrow_plugin.c */
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