feat: add nft dutch contract

contracts/Scarb.lock

@@ -1,10 +1,16 @@
 # Code generated by scarb DO NOT EDIT.
 version = 1
 
+[[package]]
+name = "alexandria_storage"
+version = "0.2.0"
+source = "git+https://github.com/keep-starknet-strange/alexandria?tag=v0.2.0#bcc4fa417abbc8b067ae6f2d382b127006b5077c"
+
 [[package]]
 name = "contracts"
 version = "0.1.0"
 dependencies = [
+ "alexandria_storage",
  "openzeppelin",
  "openzeppelin_testing",
  "snforge_std",

contracts/src/NFTDutchAuction.cairo

@@ -0,0 +1,89 @@
+#[starknet::contract]
+pub mod NFTDutchAuction {
+    use core::integer::u256;
+    use contracts::interfaces::INFTDutchAuction::INFTDutchAuction;
+    use contracts::interfaces::IERC721::{IERC721Dispatcher, IERC721DispatcherTrait};
+    use openzeppelin::token::erc20::interface::{IERC20Dispatcher, IERC20DispatcherTrait};
+    use starknet::{ContractAddress, get_caller_address, get_block_timestamp};
+    use starknet::storage::{StoragePointerReadAccess, StoragePointerWriteAccess};
+
+    #[storage]
+    struct Storage {
+        erc20_token: ContractAddress,
+        erc721_token: ContractAddress,
+        starting_price: u64,
+        seller: ContractAddress,
+        duration: u64,
+        discount_rate: u64,
+        start_at: u64,
+        expires_at: u64,
+        purchase_count: u128,
+        total_supply: u128,
+    }
+
+    mod Errors {
+        pub const AUCTION_ENDED: felt252 = 'auction has ended';
+        pub const LOW_STARTING_PRICE: felt252 = 'low starting price';
+        pub const INSUFFICIENT_BALANCE: felt252 = 'insufficient balance';
+    }
+
+    #[constructor]
+    fn constructor(
+        ref self: ContractState,
+        erc20_token: ContractAddress,
+        erc721_token: ContractAddress,
+        starting_price: u64,
+        seller: ContractAddress,
+        duration: u64,
+        discount_rate: u64,
+        total_supply: u128,
+    ) {
+        assert(starting_price >= discount_rate * duration, Errors::LOW_STARTING_PRICE);
+
+        self.erc20_token.write(erc20_token);
+        self.erc721_token.write(erc721_token);
+        self.starting_price.write(starting_price);
+        self.seller.write(seller);
+        self.duration.write(duration);
+        self.discount_rate.write(discount_rate);
+        self.start_at.write(get_block_timestamp());
+        self.expires_at.write(get_block_timestamp() + duration * 1000);
+        self.total_supply.write(total_supply);
+    }
+
+    #[abi(embed_v0)]
+    impl NFTDutchAuction of INFTDutchAuction<ContractState> {
+        fn get_price(self: @ContractState) -> u64 {
+            let time_elapsed = (get_block_timestamp() - self.start_at.read())
+                / 1000; // Ignore milliseconds
+            let discount = self.discount_rate.read() * time_elapsed;
+            self.starting_price.read() - discount
+        }
+
+        fn buy(ref self: ContractState, token_id: u256) {
+            // Check duration
+            assert(get_block_timestamp() < self.expires_at.read(), Errors::AUCTION_ENDED);
+            // Check total supply
+            assert(self.purchase_count.read() < self.total_supply.read(), Errors::AUCTION_ENDED);
+
+            let erc20_dispatcher = IERC20Dispatcher { contract_address: self.erc20_token.read() };
+            let erc721_dispatcher = IERC721Dispatcher {
+                contract_address: self.erc721_token.read(),
+            };
+
+            let caller = get_caller_address();
+            println!("Caller inside the buy: {:?}", caller);
+            // Get NFT price
+            let price: u256 = self.get_price().into();
+            let buyer_balance: u256 = erc20_dispatcher.balance_of(caller).into();
+            // Ensure buyer has enough token for payment
+            assert(buyer_balance >= price, Errors::INSUFFICIENT_BALANCE);
+            // Transfer payment token from buyer to seller
+            erc20_dispatcher.transfer_from(caller, self.seller.read(), price.try_into().unwrap());
+            // Mint token to buyer's address
+            erc721_dispatcher.mint(caller, token_id);
+            // Increase purchase count
+            self.purchase_count.write(self.purchase_count.read() + 1);
+        }
+    }
+}

contracts/src/interfaces.cairo

@@ -1,3 +1,5 @@
 pub mod IDefiVault;
 pub mod IStarkIdentity;
 pub mod timelock;
+pub mod INFTDutchAuction;
+pub mod IERC721;

contracts/src/interfaces/IERC721.cairo

@@ -0,0 +1,20 @@
+use starknet::ContractAddress;
+
+#[starknet::interface]
+pub trait IERC721<TContractState> {
+    fn get_name(self: @TContractState) -> felt252;
+    fn get_symbol(self: @TContractState) -> felt252;
+    fn get_token_uri(self: @TContractState, token_id: u256) -> felt252;
+    fn balance_of(self: @TContractState, account: ContractAddress) -> u256;
+    fn owner_of(self: @TContractState, token_id: u256) -> ContractAddress;
+    fn get_approved(self: @TContractState, token_id: u256) -> ContractAddress;
+    fn is_approved_for_all(
+        self: @TContractState, owner: ContractAddress, operator: ContractAddress,
+    ) -> bool;
+    fn approve(ref self: TContractState, to: ContractAddress, token_id: u256);
+    fn set_approval_for_all(ref self: TContractState, operator: ContractAddress, approved: bool);
+    fn transfer_from(
+        ref self: TContractState, from: ContractAddress, to: ContractAddress, token_id: u256,
+    );
+    fn mint(ref self: TContractState, to: ContractAddress, token_id: u256);
+}

contracts/src/interfaces/INFTDutchAuction.cairo

@@ -0,0 +1,5 @@
+#[starknet::interface]
+pub trait INFTDutchAuction<TContractState> {
+    fn buy(ref self: TContractState, token_id: u256);
+    fn get_price(self: @TContractState) -> u64;
+}

contracts/src/lib.cairo

@@ -6,4 +6,6 @@ pub mod merkle;
 pub mod starkfinder;
 pub mod starkidentity;
 pub mod mock_erc20;
+pub mod mock_erc721;
+pub mod NFTDutchAuction;
 pub mod timelock;

contracts/src/mock_erc721.cairo

@@ -0,0 +1,221 @@
+use starknet::ContractAddress;
+
+#[starknet::interface]
+pub trait IERC721<TContractState> {
+    fn get_name(self: @TContractState) -> felt252;
+    fn get_symbol(self: @TContractState) -> felt252;
+    fn get_token_uri(self: @TContractState, token_id: u256) -> felt252;
+    fn balance_of(self: @TContractState, account: ContractAddress) -> u256;
+    fn owner_of(self: @TContractState, token_id: u256) -> ContractAddress;
+    fn get_approved(self: @TContractState, token_id: u256) -> ContractAddress;
+    fn is_approved_for_all(
+        self: @TContractState, owner: ContractAddress, operator: ContractAddress,
+    ) -> bool;
+    fn approve(ref self: TContractState, to: ContractAddress, token_id: u256);
+    fn set_approval_for_all(ref self: TContractState, operator: ContractAddress, approved: bool);
+    fn transfer_from(
+        ref self: TContractState, from: ContractAddress, to: ContractAddress, token_id: u256,
+    );
+    fn mint(ref self: TContractState, to: ContractAddress, token_id: u256);
+}
+
+#[starknet::contract]
+mod MockERC721 {
+
+    use starknet::{ContractAddress, get_caller_address};
+    use starknet::storage::{
+        Map, StorageMapReadAccess, StorageMapWriteAccess, StoragePointerReadAccess,
+        StoragePointerWriteAccess,
+    };
+    use core::num::traits::Zero;
+
+    #[storage]
+    struct Storage {
+        name: felt252,
+        symbol: felt252,
+        owners: Map::<u256, ContractAddress>,
+        balances: Map::<ContractAddress, u256>,
+        token_approvals: Map::<u256, ContractAddress>,
+        operator_approvals: Map::<(ContractAddress, ContractAddress), bool>,
+        token_uri: Map<u256, felt252>,
+    }
+
+    #[event]
+    #[derive(Drop, starknet::Event)]
+    enum Event {
+        Approval: Approval,
+        Transfer: Transfer,
+        ApprovalForAll: ApprovalForAll,
+    }
+
+    #[derive(Drop, starknet::Event)]
+    struct Approval {
+        owner: ContractAddress,
+        to: ContractAddress,
+        token_id: u256,
+    }
+
+    #[derive(Drop, starknet::Event)]
+    struct Transfer {
+        from: ContractAddress,
+        to: ContractAddress,
+        token_id: u256,
+    }
+
+    #[derive(Drop, starknet::Event)]
+    struct ApprovalForAll {
+        owner: ContractAddress,
+        operator: ContractAddress,
+        approved: bool,
+    }
+
+    #[constructor]
+    fn constructor(ref self: ContractState, _name: felt252, _symbol: felt252) {
+        self.name.write(_name);
+        self.symbol.write(_symbol);
+    }
+
+    #[abi(embed_v0)]
+    impl IERC721Impl of super::IERC721<ContractState> {
+        fn get_name(self: @ContractState) -> felt252 {
+            self.name.read()
+        }
+        fn get_symbol(self: @ContractState) -> felt252 {
+            self.symbol.read()
+        }
+        fn get_token_uri(self: @ContractState, token_id: u256) -> felt252 {
+            assert(self._exists(token_id), 'ERC721: invalid token ID');
+            self.token_uri.read(token_id)
+        }
+        fn balance_of(self: @ContractState, account: ContractAddress) -> u256 {
+            assert(account.is_non_zero(), 'ERC721: address zero');
+            self.balances.read(account)
+        }
+        fn owner_of(self: @ContractState, token_id: u256) -> ContractAddress {
+            let owner = self.owners.read(token_id);
+            owner
+        }
+        fn get_approved(self: @ContractState, token_id: u256) -> ContractAddress {
+            assert(self._exists(token_id), 'ERC721: invalid token ID');
+            self.token_approvals.read(token_id)
+        }
+        fn is_approved_for_all(
+            self: @ContractState, owner: ContractAddress, operator: ContractAddress,
+        ) -> bool {
+            self.operator_approvals.read((owner, operator))
+        }
+
+        fn approve(ref self: ContractState, to: ContractAddress, token_id: u256) {
+            let owner = self.owner_of(token_id);
+            assert(to != owner, 'Approval to current owner');
+            assert(
+                get_caller_address() == owner
+                    || self.is_approved_for_all(owner, get_caller_address()),
+                'Not token owner',
+            );
+            self.token_approvals.write(token_id, to);
+            self.emit(Approval { owner: self.owner_of(token_id), to: to, token_id: token_id });
+        }
+
+        fn set_approval_for_all(
+            ref self: ContractState, operator: ContractAddress, approved: bool,
+        ) {
+            let owner = get_caller_address();
+            assert(owner != operator, 'ERC721: approve to caller');
+            self.operator_approvals.write((owner, operator), approved);
+            self.emit(ApprovalForAll { owner: owner, operator: operator, approved: approved });
+        }
+
+        fn transfer_from(
+            ref self: ContractState, from: ContractAddress, to: ContractAddress, token_id: u256,
+        ) {
+            assert(
+                self._is_approved_or_owner(get_caller_address(), token_id),
+                'neither owner nor approved',
+            );
+            self._transfer(from, to, token_id);
+        }
+
+        fn mint(ref self: ContractState, to: ContractAddress, token_id: u256) {
+            self._mint(to, token_id);
+        }
+    }
+
+    #[generate_trait]
+    impl ERC721HelperImpl of ERC721HelperTrait {
+
+        fn _exists(self: @ContractState, token_id: u256) -> bool {
+            // check that owner of token is not zero
+            self.owner_of(token_id).is_non_zero()
+        }
+
+        fn _is_approved_or_owner(
+            self: @ContractState, spender: ContractAddress, token_id: u256,
+        ) -> bool {
+            let owner = self.owners.read(token_id);
+            spender == owner
+                || self.is_approved_for_all(owner, spender)
+                || self.get_approved(token_id) == spender
+        }
+
+        fn _set_token_uri(ref self: ContractState, token_id: u256, token_uri: felt252) {
+            assert(self._exists(token_id), 'ERC721: invalid token ID');
+            self.token_uri.write(token_id, token_uri);
+        }
+
+        fn _transfer(
+            ref self: ContractState, from: ContractAddress, to: ContractAddress, token_id: u256,
+        ) {
+            // check that from address is equal to owner of token
+            assert(from == self.owner_of(token_id), 'ERC721: Caller is not owner');
+            // check that to address is not zero
+            assert(to.is_non_zero(), 'ERC721: transfer to 0 address');
+
+            // remove previously made approvals
+            self.token_approvals.write(token_id, Zero::zero());
+
+            // increase balance of to address, decrease balance of from address
+            self.balances.write(from, self.balances.read(from) - 1.into());
+            self.balances.write(to, self.balances.read(to) + 1.into());
+
+            // update token_id owner
+            self.owners.write(token_id, to);
+
+            // emit the Transfer event
+            self.emit(Transfer { from: from, to: to, token_id: token_id });
+        }
+
+        fn _mint(ref self: ContractState, to: ContractAddress, token_id: u256) {
+            assert(to.is_non_zero(), 'TO_IS_ZERO_ADDRESS');
+
+            // Ensures token_id is unique
+            assert(!self.owner_of(token_id).is_non_zero(), 'ERC721: Token already minted');
+
+            // Increase receiver balance
+            let receiver_balance = self.balances.read(to);
+            self.balances.write(to, receiver_balance + 1.into());
+
+            // Update token_id owner
+            self.owners.write(token_id, to);
+
+            // emit Transfer event
+            self.emit(Transfer { from: Zero::zero(), to: to, token_id: token_id });
+        }
+
+        fn _burn(ref self: ContractState, token_id: u256) {
+            let owner = self.owner_of(token_id);
+
+            // Clear approvals
+            self.token_approvals.write(token_id, Zero::zero());
+
+            // Decrease owner balance
+            let owner_balance = self.balances.read(owner);
+            self.balances.write(owner, owner_balance - 1.into());
+
+            // Delete owner
+            self.owners.write(token_id, Zero::zero());
+            // emit the Transfer event
+            self.emit(Transfer { from: owner, to: Zero::zero(), token_id: token_id });
+        }
+    }
+}

contracts/tests/lib.cairo

@@ -4,5 +4,6 @@ mod test_defi_contract;
 mod test_erc20;
 mod test_starkfinder;
 mod test_starkidentity;
+mod test_nft_dutch;
 #[feature("safe_dispatcher")]
 mod test_timelock;