use near_sdk::borsh::{self, BorshDeserialize, BorshSerialize};
use near_sdk::json_types::Base64VecU8;
use near_sdk::serde::{Deserialize, Serialize};
use near_sdk::{ext_contract, require};
pub const FT_METADATA_SPEC: &str = "ft-1.0.0";
#[derive(BorshDeserialize, BorshSerialize, Clone, Deserialize, Serialize)]
#[serde(crate = "near_sdk::serde")]
#[cfg_attr(feature = "abi", derive(schemars::JsonSchema))]
pub struct FungibleTokenMetadata {
pub spec: String,
pub name: String,
pub symbol: String,
pub icon: Option<String>,
pub reference: Option<String>,
pub reference_hash: Option<Base64VecU8>,
pub decimals: u8,
}
#[ext_contract(ext_ft_metadata)]
pub trait FungibleTokenMetadataProvider {
fn ft_metadata(&self) -> FungibleTokenMetadata;
}
impl FungibleTokenMetadata {
pub fn assert_valid(&self) {
require!(self.spec == FT_METADATA_SPEC);
require!(self.reference.is_some() == self.reference_hash.is_some());
if let Some(reference_hash) = &self.reference_hash {
require!(reference_hash.0.len() == 32, "Hash has to be 32 bytes");
}
}
}