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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2020--2021 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20/**
21 * @author Tobias Frisch
22 * @file src/messenger/messenger_api_contact_store.h
23 * @brief messenger api: client implementation of GNUnet MESSENGER service
24 */
25
26#ifndef GNUNET_MESSENGER_API_CONTACT_STORE_H
27#define GNUNET_MESSENGER_API_CONTACT_STORE_H
28
29#include "platform.h"
30#include "gnunet_container_lib.h"
31#include "gnunet_crypto_lib.h"
32#include "gnunet_identity_service.h"
33
34struct GNUNET_MESSENGER_Contact;
35
36struct GNUNET_MESSENGER_ContactStore
37{
38 struct GNUNET_CONTAINER_MultiHashMap *anonymous;
39 struct GNUNET_CONTAINER_MultiHashMap *contacts;
40};
41
42/**
43 * Initializes a contact store as fully empty.
44 *
45 * @param[out] store Contact store
46 */
47void
48init_contact_store (struct GNUNET_MESSENGER_ContactStore *store);
49
50/**
51 * Clears a contact store, wipes its content and deallocates its memory.
52 *
53 * @param[in/out] store Contact store
54 */
55void
56clear_contact_store (struct GNUNET_MESSENGER_ContactStore *store);
57
58/**
59 * Returns a contact using the hash of a specific public key. In case the anonymous
60 * key gets used by the requested contact, it will use its provided member
61 * <i>context</i> to select the matching contact from the <i>store</i>.
62 *
63 * In case there is no contact stored which uses the given key or context,
64 * NULL gets returned.
65 *
66 * @param[in/out] store Contact store
67 * @param[in] context Member context
68 * @param[in] key_hash Hash of public key
69 */
70struct GNUNET_MESSENGER_Contact*
71get_store_contact_raw (struct GNUNET_MESSENGER_ContactStore *store, const struct GNUNET_HashCode *context,
72 const struct GNUNET_HashCode *key_hash);
73
74/**
75 * Returns a contact using a specific public key. In case the anonymous
76 * key gets used by the requested contact, it will use its provided member
77 * <i>context</i> to select the matching contact from the <i>store</i>.
78 *
79 * In case there is no contact stored which uses the given key or context,
80 * a new contact will be created automatically.
81 *
82 * The function returns NULL if an error occurs during allocation
83 * or validation of the contacts key.
84 *
85 * @param[in/out] store Contact store
86 * @param[in] context Member context
87 * @param[in] pubkey Public key of EGO
88 */
89struct GNUNET_MESSENGER_Contact*
90get_store_contact (struct GNUNET_MESSENGER_ContactStore *store, const struct GNUNET_HashCode *context,
91 const struct GNUNET_IDENTITY_PublicKey *pubkey);
92
93/**
94 * Moves a <i>contact</i> from the <i>store</i> to another location
95 * matching a given public key and member <i>context</i>.
96 *
97 * This function allows changes of keys or changes of member contexts!
98 *
99 * @param[in/out] store Contact store
100 * @param[in/out] contact Contact
101 * @param[in] context Member context
102 * @param[in] next_context Member context
103 * @param[in] pubkey Public key of EGO
104 */
105void
106update_store_contact (struct GNUNET_MESSENGER_ContactStore *store, struct GNUNET_MESSENGER_Contact* contact,
107 const struct GNUNET_HashCode *context, const struct GNUNET_HashCode *next_context,
108 const struct GNUNET_IDENTITY_PublicKey *pubkey);
109
110/**
111 * Removes a <i>contact</i> from the <i>store</i> which uses
112 * a given member <i>context</i>.
113 *
114 * @param[in/out] store Contact store
115 * @param[in/out] contact Contact
116 * @param[in] context Member context
117 */
118void
119remove_store_contact (struct GNUNET_MESSENGER_ContactStore *store, struct GNUNET_MESSENGER_Contact* contact,
120 const struct GNUNET_HashCode *context);
121
122#endif //GNUNET_MESSENGER_API_CONTACT_STORE_H