MarketplaceBlacklist

1pub contract MarketplaceBlacklist {
2
3    // listingId : nftId
4    pub let blacklist: {UInt64: UInt64}
5
6    pub event MarketplaceBlacklistAdd(listingId: UInt64, nftId: UInt64)
7
8    pub event MarketplaceBlacklistRemove(listingId: UInt64, nftId: UInt64)
9
10    init () {
11        self.blacklist = {}
12    }
13
14    pub fun exist(listingId: UInt64): Bool {
15        return self.blacklist.containsKey(listingId)
16    }
17
18    pub fun add(listingId: UInt64, nftId: UInt64) {
19        self.blacklist[listingId] = nftId
20        emit MarketplaceBlacklistAdd(listingId: listingId, nftId: nftId)
21    }
22
23    pub fun remove(listingId: UInt64) {
24        pre {
25            self.blacklist[listingId] != nil: "listingId not exist"
26        }
27        let nftId = self.blacklist.remove(key: listingId)
28        if let unwrappedNftId = nftId {
29            emit MarketplaceBlacklistRemove(listingId: listingId, nftId: unwrappedNftId)
30        }
31        assert(nftId != nil, message: "Not been removed successfully!")
32    }
33
34}
35