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//! Erc721 standard implementation.
use odra::casper_types::{bytesrepr::Bytes, U256};
use odra::prelude::*;
pub mod erc721_base;
pub mod extensions;
pub mod owned_erc721_with_metadata;
/// The ERC-721 interface as defined in the standard.
pub trait Erc721 {
/// Returns the amount of tokens owned by `owner`.
fn balance_of(&self, owner: &Address) -> U256;
/// Returns the `owner` of the `token_id` token.
///
/// Reverts if token_id does not exist.
fn owner_of(&self, token_id: &U256) -> Address;
/// Safely transfers `token_id` token from `from` to `to`, checking the recipient contract uses
/// [Erc721Receiver](crate::erc721_receiver::Erc721Receiver).
///
/// Emits a [Transfer](crate::erc721::events::Transfer) event.
fn safe_transfer_from(&mut self, from: &Address, to: &Address, token_id: &U256);
/// Safely transfers `token_id` token from `from` to `to`, checking the recipient contract uses
/// [Erc721Receiver](crate::erc721_receiver::Erc721Receiver), passes additional data.
///
/// Emits a [Transfer](crate::erc721::events::Transfer) event.
fn safe_transfer_from_with_data(
&mut self,
from: &Address,
to: &Address,
token_id: &U256,
data: &Bytes
);
/// Transfers a specific NFT `tokenId` from one account `from` to another `to`.
fn transfer_from(&mut self, from: &Address, to: &Address, token_id: &U256);
/// Grants permission to `approved` to transfer `token_id` token. The approval is cleared when the token is transferred.
///
/// Only a single account can be approved at a time, so approving None clears the previous approval.
fn approve(&mut self, approved: &Option<Address>, token_id: &U256);
/// Approves or removes operator for the caller. Operators can call `transfer_from` or `safe_transfer_from` for all
/// tokens owned by the caller.
///
/// The operator cannot be the caller.
///
/// Emits a [ApprovalForAll](crate::erc721::events::ApprovalForAll) event.
fn set_approval_for_all(&mut self, operator: &Address, approved: bool);
/// Returns the address approved for `token_id` token.
///
/// Reverts if token_id does not exist.
fn get_approved(&self, token_id: &U256) -> Option<Address>;
/// Returns if the `operator` is allowed to manage all of the tokens of `owner`.
fn is_approved_for_all(&self, owner: &Address, operator: &Address) -> bool;
}
/// Erc721-related Odra events.
pub mod events {
use odra::casper_event_standard;
use odra::casper_types::U256;
use odra::prelude::*;
/// Emitted when the `token_id` token is transferred (also minted or burned).
#[odra::event]
pub struct Transfer {
/// The address of the sender.
pub from: Option<Address>,
/// The address of the receiver.
pub to: Option<Address>,
/// The token id.
pub token_id: U256
}
/// Emitted when the `owner` approves `approved` to operate on the `token_id` token.
#[odra::event]
pub struct Approval {
/// The owner of the tokens.
pub owner: Address,
/// The operator that is approved.
pub approved: Option<Address>,
/// The token id.
pub token_id: U256
}
/// Emitted when the `owner` approves or revokes `operator`.
#[odra::event]
pub struct ApprovalForAll {
/// The owner of the tokens.
pub owner: Address,
/// The operator that is approved or revoked.
pub operator: Address,
/// The approval status.
pub approved: bool
}
}
/// Erc721-related Odra errors.
pub mod errors {
use odra::prelude::OdraError;
/// Possible errors in the context of Erc721 token.
#[odra::odra_error]
pub enum Error {
/// Token is invalid in the given context or does not exist.
InvalidTokenId = 30_000,
/// Address in not eligible to operate on the token.
NotAnOwnerOrApproved = 30_001,
/// The owner cannot be approved.
ApprovalToCurrentOwner = 30_002,
/// The caller cannot approve self.
ApproveToCaller = 30_003,
/// Token transfer ends with an error
TransferFailed = 30_004
}
}