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minter.py
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minter.py
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import smartpy as sp
class Minter(sp.Contract):
"""A basic minter contract for the extended FA2 token contract.
"""
USER_ROYALTIES_TYPE = sp.TRecord(
# The user address
address=sp.TAddress,
# The user royalties in per mille (100 is 10%)
royalties=sp.TNat).layout(
("address", "royalties"))
def __init__(self, administrator, metadata, fa2):
"""Initializes the contract.
"""
# Define the contract storage data types for clarity
self.init_type(sp.TRecord(
# The contract administrador
administrator=sp.TAddress,
# The contract metadata
metadata=sp.TBigMap(sp.TString, sp.TBytes),
# The FA2 token contract address
fa2=sp.TAddress,
# The proposed new administrator address
proposed_administrator=sp.TOption(sp.TAddress),
# Flag to indicate if the contract is paused or not
paused=sp.TBool))
# Initialize the contract storage
self.init(
administrator=administrator,
metadata=metadata,
fa2=fa2,
proposed_administrator=sp.none,
paused=False)
def check_is_administrator(self):
"""Checks that the address that called the entry point is the contract
administrator.
"""
sp.verify(sp.sender == self.data.administrator,
message="MINTER_NOT_ADMIN")
@sp.entry_point
def mint(self, params):
"""Mints a new FA2 token. The minter and the creator are assumed to be
the same person.
"""
# Define the input parameter data type
sp.set_type(params, sp.TRecord(
editions=sp.TNat,
metadata=sp.TMap(sp.TString, sp.TBytes),
data=sp.TMap(sp.TString, sp.TBytes),
royalties=sp.TNat).layout(
("editions", ("metadata", ("data", "royalties")))))
# Check that the contract is not paused
sp.verify(~self.data.paused, message="MINT_PAUSED")
# Check that the number of editions is not zero
sp.verify(params.editions != 0, message="MINT_ZERO_EDITIONS")
# Check that the creator royalties are less than 25%
sp.verify(params.royalties <= 250, message="MINT_INVALID_ROYALTIES")
# Get a handle on the FA2 contract mint entry point
fa2_mint_handle = sp.contract(
t=sp.TRecord(
amount=sp.TNat,
metadata=sp.TMap(sp.TString, sp.TBytes),
data=sp.TMap(sp.TString, sp.TBytes),
royalties=sp.TRecord(
minter=Minter.USER_ROYALTIES_TYPE,
creator=Minter.USER_ROYALTIES_TYPE).layout(
("minter", "creator"))).layout(
("amount", ("metadata", ("data", "royalties")))),
address=self.data.fa2,
entry_point="mint").open_some()
# Mint the token
sp.transfer(
arg=sp.record(
amount=params.editions,
metadata=params.metadata,
data=params.data,
royalties=sp.record(
minter=sp.record(address=sp.sender, royalties=0),
creator=sp.record(address=sp.sender, royalties=params.royalties))),
amount=sp.mutez(0),
destination=fa2_mint_handle)
@sp.entry_point
def transfer_administrator(self, proposed_administrator):
"""Proposes to transfer the contract administrator to another address.
"""
# Define the input parameter data type
sp.set_type(proposed_administrator, sp.TAddress)
# Check that the administrator executed the entry point
self.check_is_administrator()
# Set the new proposed administrator address
self.data.proposed_administrator = sp.some(proposed_administrator)
@sp.entry_point
def accept_administrator(self):
"""The proposed administrator accepts the contract administrator
responsabilities.
"""
# Check that there is a proposed administrator
sp.verify(self.data.proposed_administrator.is_some(),
message="MINTER_NO_NEW_ADMIN")
# Check that the proposed administrator executed the entry point
sp.verify(sp.sender == self.data.proposed_administrator.open_some(),
message="MINTER_NOT_PROPOSED_ADMIN")
# Set the new administrator address
self.data.administrator = sp.sender
# Reset the proposed administrator value
self.data.proposed_administrator = sp.none
@sp.entry_point
def transfer_fa2_administrator(self, proposed_fa2_administrator):
"""Proposes to transfer the FA2 token contract administator to another
minter contract.
"""
# Define the input parameter data type
sp.set_type(proposed_fa2_administrator, sp.TAddress)
# Check that the administrator executed the entry point
self.check_is_administrator()
# Get a handle on the FA2 contract transfer_administator entry point
fa2_transfer_administrator_handle = sp.contract(
t=sp.TAddress,
address=self.data.fa2,
entry_point="transfer_administrator").open_some()
# Propose to transfer the FA2 token contract administrator
sp.transfer(
arg=proposed_fa2_administrator,
amount=sp.mutez(0),
destination=fa2_transfer_administrator_handle)
@sp.entry_point
def accept_fa2_administrator(self):
"""Accepts the FA2 contract administrator responsabilities.
"""
# Check that the administrator executed the entry point
self.check_is_administrator()
# Get a handle on the FA2 contract accept_administator entry point
fa2_accept_administrator_handle = sp.contract(
t=sp.TUnit,
address=self.data.fa2,
entry_point="accept_administrator").open_some()
# Accept the FA2 token contract administrator responsabilities
sp.transfer(
arg=sp.unit,
amount=sp.mutez(0),
destination=fa2_accept_administrator_handle)
@sp.entry_point
def set_pause(self, pause):
"""Pause or not minting with the contract.
"""
# Define the input parameter data type
sp.set_type(pause, sp.TBool)
# Check that the administrator executed the entry point
self.check_is_administrator()
# Pause or unpause the mints
self.data.paused = pause
@sp.onchain_view(pure=True)
def is_paused(self):
"""Checks if the contract is paused.
"""
# Return true if the contract is paused
sp.result(self.data.paused)
sp.add_compilation_target("minter", Minter(
administrator=sp.address("tz1M9CMEtsXm3QxA7FmMU2Qh7xzsuGXVbcDr"),
metadata=sp.utils.metadata_of_url("ipfs://aaa"),
fa2=sp.address("KT1M9CMEtsXm3QxA7FmMU2Qh7xzsuGXVbcDr")))