Contract con_fu


Contract Code


  
1 collection_name = Variable()
2 collection_owner = Variable()
3 collection_nfts = Hash(default_value=0)
4 collection_balances = Hash(default_value=0)
5 collection_balances_approvals = Hash(default_value=0)
6
7 @construct
8 def seed():
9 collection_name.set("FU")
10 collection_owner.set(ctx.caller)
11
12 @export
13 def mint_nft(name: str, description: str, ipfs_image_url: str, metadata: dict, amount: int):
14 assert name != "", "Name cannot be empty"
15 assert collection_nfts[name] == 0, "Name already exists"
16 assert amount > 0, "You cannot transfer negative amounts"
17 assert collection_owner.get() == ctx.caller, "Only the collection owner can mint NFTs"
18
19 collection_nfts[name] = {"description": description, "ipfs_image_url": ipfs_image_url, "metadata": metadata, "amount": amount}
20 collection_balances[ctx.caller, name] = amount
21
22 @export
23 def transfer(name: str, amount:int, to: str):
24 assert amount > 0, "You cannot transfer negative amounts"
25 assert name != "", "Please specify the name of the NFT you want to transfer"
26 assert collection_balances[ctx.caller, name] >= amount, "You dont have enough NFTs to send"
27
28 collection_balances[ctx.caller, name] -= amount
29 collection_balances[to, name] += amount # Adds amount to receiver
30
31 @export
32 def approve(amount: int, name: str, to: str):
33 assert amount > 0, "Cannot approve negative amounts"
34
35 collection_balances_approvals[ctx.caller, to, name] += amount
36
37 @export
38 def transfer_from(name:str, amount:int, to: str, main_account: str):
39 assert amount > 0, "Cannot send negative balances!"
40
41 assert collection_balances_approvals[main_account, to, name] >= amount, "Not enough NFTs approved to send! You have {} and are trying to spend {}".format(collection_balances_approvals[main_account, to, name], amount)
42 assert collection_balances[main_account, name] >= amount, "Not enough NFTs to send!"
43
44 collection_balances_approvals[main_account, to, name] -= amount
45 collection_balances[main_account, name] -= amount
46
47 collection_balances[to, name] += amount
48

Byte Code

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