;; Copyright (c) 2021 by The Bitfari Foundation.
;; This file is part of Bitfari.
;; Bitfari is free software. You may redistribute or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License or
;; (at your option) any later version.
;; Bitfari is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY, including without the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with Bitfari. If not, see <http://www.gnu.org/licenses/>.
;; Assigns ownership, metadata and ID to a screen on public networks
;; preventing unathorized users from joining the network en masse
;; to create a pseudo-sybil attack.
;; ID and ownership are used for reporting. The block height of the mint
;; will also be used for incentive allotment after auditing verifies
;; the legitimacy of the screen. This token is transferable.
;; ------------------------------------------------------------------------------------------------------------------
;; SIP090 interface (testnet)
;;(impl-trait 'ST32XCD69XPS3GKDEXAQ29PJRDSD5AR643GY0C3Q5.nft-trait.nft-trait)
;; SIP090 interface (mainnet)
(impl-trait 'SP39EMTZG4P7D55FMEQXEB8ZEQEK0ECBHB1GD8GMT.nft-trait.nft-trait)
;; Register a bitfari public screen
(define-non-fungible-token screen-nft uint)
;; Store the variables
(define-data-var last-id uint u0)
;; Claim a new NFT
(define-public (claim)
(mint tx-sender))
;; SIP009: Transfer the token to a specified principal
(define-public (transfer (token-id uint) (sender principal) (recipient principal))
(if (and
(is-eq tx-sender sender))
(match (nft-transfer? screen-nft token-id sender recipient)
success (ok success)
error (err error))
(err u500)))
;; SIP009: Get the owner of the specified token ID
(define-read-only (get-owner (token-id uint))
(ok (nft-get-owner? screen-nft token-id)))
;; SIP009: Get the last token ID
(define-read-only (get-last-token-id)
(ok (var-get last-id)))
;; SIP009: Get the token URI
(define-read-only (get-token-uri (token-id uint))
(ok (some "https://bitfari.org/screen-nft/")))
;; Mint a new screen NFT
(define-public (mint (new-owner principal))
(let ((next-id (+ u1 (var-get last-id))))
(match (nft-mint? screen-nft next-id new-owner)
success
(begin
(var-set last-id next-id)
(ok true))
error (err error))))