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/*
This file is part of GNUnet
Copyright (C) 2010-2015 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
*/
/**
* @file reclaim/did_core.c
* @brief Core functionality for DID
* @author Tristan Schwieren
*/
// TODO: Expiration time missing in create
// TODO: Check if ego already has a DID document in create
// TODO: Store DID document with empty label and own type (maybe DID-Document or Json??)
// TODO: Store DID document as compact JSON in GNS but resolve it with newlines
#include "did_core.h"
// #define DID_DOCUMENT_LABEL GNUNET_GNS_EMPTY_LABEL_AT
#define DID_DOCUMENT_LABEL "didd"
#define DID_DOCUMENT_DEFAULT_EXPIRATION_TIME "1d"
struct DID_resolve_return
{
DID_resolve_callback *cb;
void *cls;
};
struct DID_action_return
{
DID_action_callback *cb;
void *cls;
};
// ------------------------------------------------ //
// -------------------- Resolve ------------------- //
// ------------------------------------------------ //
/**
* @brief GNS lookup callback. Calls the given callback function
* and gives it the DID Document.
* Fails if there is more than one DID record.
*
* @param cls closure
* @param rd_count number of records in rd
* @param rd the records in the reply
*/
static void
DID_resolve_gns_lookup_cb (
void *cls,
uint32_t rd_count,
const struct GNUNET_GNSRECORD_Data *rd)
{
char *did_document;
DID_resolve_callback *cb = ((struct DID_resolve_return *) cls)->cb;
void *cls2 = ((struct DID_resolve_return *) cls)->cls;
free (cls);
if (rd_count != 1)
cb (GNUNET_NO, "An ego should only have one DID Document", cls2);
if (rd[0].record_type == GNUNET_DNSPARSER_TYPE_TXT)
{
did_document = (char *) rd[0].data;
cb (GNUNET_OK, did_document, cls2);
}
else
cb (GNUNET_NO, "DID Document is not a TXT record\n", cls2);
}
/**
* @brief Resolve a DID.
* Calls the given callback function with the resolved DID Document and the given closure.
* If the did can not be resolved did_document is NULL.
*
* @param did DID that is resolved
* @param gns_handle pointer to gns handle.
* @param cont callback function
* @param cls closure
*/
enum GNUNET_GenericReturnValue
DID_resolve (const char *did,
struct GNUNET_GNS_Handle *gns_handle,
DID_resolve_callback *cont,
void *cls)
{
struct GNUNET_IDENTITY_PublicKey pkey;
// did, gns_handle and cont must me set
if ((did == NULL) || (gns_handle == NULL) || (cont == NULL))
return GNUNET_NO;
if (GNUNET_OK != DID_did_to_pkey (did, &pkey))
return GNUNET_NO;
// Create closure for lockup callback
struct DID_resolve_return *cls2 = malloc (sizeof(struct DID_resolve_return));
cls2->cb = cont;
cls2->cls = cls;
GNUNET_GNS_lookup (gns_handle, DID_DOCUMENT_LABEL, &pkey,
GNUNET_DNSPARSER_TYPE_TXT,
GNUNET_GNS_LO_DEFAULT, &DID_resolve_gns_lookup_cb, cls2);
return GNUNET_OK;
}
// ------------------------------------------------ //
// -------------------- Create -------------------- //
// ------------------------------------------------ //
static void
DID_create_did_store_cb (void *cls,
int32_t success,
const char *emsg)
{
DID_action_callback *cb = ((struct DID_action_return *) cls)->cb;
void *cls2 = ((struct DID_action_return *) cls)->cls;
free (cls);
if (GNUNET_OK == success)
{
cb (GNUNET_OK, (void *) cls2);
}
else
{
// TODO: Log emsg. Not writing it to STDOUT
printf ("%s\n", emsg);
cb (GNUNET_NO, (void *) cls2);
}
}
/**
* @brief Creates a DID and saves DID Document in Namestore.
*
* @param ego ego for which the DID should be created.
* @param did_document did_document that should be saved in namestore.
* If did_document==NULL -> Default DID document is created.
* @param cfg_handle pointer to configuration handle
* @param identity_hanlde pointer to identity handle. Can be NULL if ego!=NULL
* @param namestore_handle
* @param cont callback function
* @param cls closure
*/
enum GNUNET_GenericReturnValue
DID_create (const struct GNUNET_IDENTITY_Ego *ego,
const char *did_document,
struct GNUNET_NAMESTORE_Handle *namestore_handle,
DID_action_callback *cont,
void *cls)
{
struct GNUNET_IDENTITY_PublicKey pkey;
struct GNUNET_TIME_Relative expire_time;
struct GNUNET_GNSRECORD_Data record_data;
// Ego, namestore_handle and cont must be set
if ((ego == NULL) || (namestore_handle == NULL) || (cont == NULL))
return GNUNET_NO;
// Check if ego has EdDSA key
GNUNET_IDENTITY_ego_get_public_key ((struct GNUNET_IDENTITY_Ego *) ego,
&pkey);
if (ntohl (pkey.type) != GNUNET_GNSRECORD_TYPE_EDKEY)
{
printf ("The EGO has to have an EdDSA key pair\n");
return GNUNET_NO;
}
// No DID Document is given a default one is created
if (did_document != NULL)
printf (
"DID Docuement is read from \"DID-document\" argument (EXPERIMENTAL)\n");
else
did_document = DID_pkey_to_did_document (&pkey);
// TODO: Get the expiration time as argument
if (GNUNET_OK != GNUNET_STRINGS_fancy_time_to_relative (
DID_DOCUMENT_DEFAULT_EXPIRATION_TIME, &expire_time))
{
printf ("Failed to read given expiration time\n");
return GNUNET_NO;
}
// Create record
record_data.data = did_document;
record_data.expiration_time = expire_time.rel_value_us;
record_data.data_size = strlen (did_document) + 1;
record_data.record_type = GNUNET_GNSRECORD_typename_to_number ("TXT"),
record_data.flags = GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION;
// Create closure for record store callback
struct DID_action_return *cls2 = malloc (sizeof(struct DID_action_return));
cls2->cb = cont;
cls2->cls = cls;
// Store record
GNUNET_NAMESTORE_records_store (namestore_handle,
GNUNET_IDENTITY_ego_get_private_key (ego),
DID_DOCUMENT_LABEL,
1, // FIXME what if GNUNET_GNS_EMPTY_LABEL_AT has records
&record_data,
&DID_create_did_store_cb,
(void *) cls2);
return GNUNET_OK;
}
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