Aptos 同质化资产（FA）标准

public fun create_primary_store_enabled_fungible_asset(
    constructor_ref: &ConstructorRef,
    // This ensures total supply does not surpass this limit - however,
    // Setting this will prevent any parallel execution of mint and burn.
    maximum_supply: Option<u128>,
    // The fields below here are purely metadata and have no impact on-chain.
    name: String,
    symbol: String,
    decimals: u8,
    icon_uri: String,
    project_uri: String,
)

module my_addr::fungible_asset_example {
    use aptos_framework::fungible_asset::{Self, MintRef, TransferRef, BurnRef, Metadata, FungibleAsset};
    use aptos_framework::object::{Self, Object};
    use aptos_framework::primary_fungible_store;
    use std::error;
    use std::signer;
    use std::string::utf8;
    use std::option;
 
  const ASSET_SYMBOL: vector<u8> = b"FA";
 
	// Make sure the `signer` you pass in is an address you own.
	// Otherwise you will lose access to the Fungible Asset after creation.
  entry fun init_module(admin: &signer) {
    // Creates a non-deletable object with a named address based on our ASSET_SYMBOL
    let constructor_ref = &object::create_named_object(admin, ASSET_SYMBOL);
 
    // Create the FA's Metadata with your name, symbol, icon, etc.
    primary_fungible_store::create_primary_store_enabled_fungible_asset(
        constructor_ref,
        option::none(),
        utf8(b"FA Coin"), /* name */
        utf8(ASSET_SYMBOL), /* symbol */
        8, /* decimals */
        utf8(b"http://example.com/favicon.ico"), /* icon */
        utf8(b"http://example.com"), /* project */
    );
 
    // Generate the MintRef for this object
    // Used by fungible_asset::mint() and fungible_asset::mint_to()
    let mint_ref = fungible_asset::generate_mint_ref(constructor_ref);
 
    // Generate the TransferRef for this object
    // Used by fungible_asset::set_frozen_flag(), fungible_asset::withdraw_with_ref(),
    // fungible_asset::deposit_with_ref(), and fungible_asset::transfer_with_ref().
    let transfer_ref = fungible_asset::generate_transfer_ref(constructor_ref);
 
    // Generate the BurnRef for this object
    // Used by fungible_asset::burn() and fungible_asset::burn_from()
    let burn_ref = fungible_asset::generate_burn_ref(constructor_ref);
 
    // Add any other logic required for your use case.
    // ...
  }
}

public fun mint(ref: &MintRef, amount:u64): FungibleAsset

public fun burn(ref: &BurnRef, fa: FungibleAsset)

public fun primary_fungible_store::withdraw<T: key>(owner: &signer, metadata: Object<T>, amount:u64): FungibleAsset

public fun primary_fungible_store::deposit(owner: address, fa: FungibleAsset)

public entry fun primary_fungible_store::transfer<T: key>(sender: &signer, metadata: Object<T>, recipient: address, amount:u64)

public fun primary_fungible_store::balance<T: key>(account: address, metadata: Object<T>): u64

public primary_fungible_store::fun is_frozen<T: key>(account: address, metadata: Object<T>): bool

struct Deposit has drop, store {
    store: address,
    amount: u64,
}

struct Withdraw has drop, store {
    store: address,
    amount: u64,
}

struct Frozen has drop, store {
    store: address,
    frozen: bool,
}

module my_addr::my_fungible_asset_example {
    // ...
    public fun withdraw<T: key>(
        store: Object<T>,
        amount: u64,
        transfer_ref: &TransferRef,
    ): FungibleAsset {
        // Your custom logic here
    }
 
    public fun deposit<T: key>(
        store: Object<T>,
        fa: FungibleAsset,
        transfer_ref: &TransferRef,
    ) {
        // Your custom logic here
    }
    // ...
}

module 0x1::dispatchable_fungible_asset {
    public fun register_dispatch_functions(
        constructor_ref: &ConstructorRef,
        withdraw_function: Option<FunctionInfo>,
        deposit_function: Option<FunctionInfo>,
        derived_balance_function: Option<FunctionInfo>,
    )
}

module 0x1::dispatchable_fungible_asset {
    public fun new_function_info(module_signer: &signer, module_name: String, function_name: String): FunctionInfo
}

module my_addr::my_fungible_asset_example {
    use aptos_framework::string;
    use aptos_framework::object;
    use aptos_framework::primary_fungible_store;
    use aptos_framework::dispatchable_fungible_asset;
 
    fun create_fungible_asset(module_signer: &signer, /* ... */) {
        // Make the deposit override function info
        let deposit_override = dispatchable_fungible_asset::new_function_info(
            module_signer,
            string::utf8(b"example"),
            string::utf8("deposit")
        );
 
        // Create the fungible asset
        let constructor_ref = object::create_sticky_object( /* ... */);
 
        primary_fungible_store::create_primary_store_enabled_fungible_asset(&constructor_ref, ...);
        // or below if not having primary stores
        // fungible_asset::add_fungibility(&constructor_ref, /* ... */);
 
        // Override default functionality for deposit
        dispatchable_fungible_asset::register_dispatch_functions(
            &constructor_ref,
            option::none(),
            option::some(deposit_override),
            option::none()
        );
 
        // ...
    }
 
    // ...
}

public fun primary_store<T: key>(owner: address, metadata: Object<T>): Object<FungibleStore>

public fun create_primary_store<T: key>(owner_addr: address, metadata: Object<T>): Object<FungibleStore>

public fun create_store<T: key>(constructor_ref: &ConstructorRef, metadata: Object<T>): Object<FungibleStore>

struct CoinConversionMap has key {
    coin_to_fungible_asset_map: Table<TypeInfo, address>,
}

#[view]
public fun paired_metadata<CoinType>(): Option<Object<Metadata>>

#[view]
public fun paired_coin(metadata: Object<Metadata>): Option<TypeInfo>