Cosmos

1import NonFungibleToken from 0x1d7e57aa55817448
2import MetadataViews from 0x1d7e57aa55817448
3
4pub contract Cosmos : NonFungibleToken {
5
6    pub var totalSupply: UInt64
7
8    pub let CollectionStoragePath: StoragePath
9    pub let CollectionPublicPath: PublicPath
10    pub let MinterStoragePath: StoragePath
11    pub let MinterPublicPath: PublicPath
12    //pub var CollectionPrivatePath: PrivatePath
13    pub event ContractInitialized()
14    pub event Withdraw(id: UInt64, from: Address?)
15    pub event Deposit(id: UInt64, to: Address?)
16    pub event Mint(id: UInt64, creator: Address, metadata: {String:String})
17    pub event Destroy(id: UInt64)
18
19    // We use dict to store raw metadata
20    pub resource interface RawMetadata {
21        pub fun getRawMetadata(): {String: String}
22    }
23
24    pub resource NFT: NonFungibleToken.INFT, MetadataViews.Resolver, RawMetadata {
25        pub let id: UInt64
26        pub let creator: Address
27        access(self) let metadata: {String:String}
28
29        init(
30            id: UInt64,
31            creator: Address,
32            metadata: {String: String}
33        ) {
34            self.id = id
35            self.creator = creator
36            self.metadata = metadata
37        }
38
39       pub fun getViews(): [Type] {
40            return [
41                Type<MetadataViews.Display>()
42            ]
43        }
44
45        pub fun resolveView(_ view: Type): AnyStruct? {
46            switch view {
47                case Type<MetadataViews.Display>():
48                    return MetadataViews.Display(
49                        name: self.metadata["name"]!,
50                        description: self.metadata["description"]!,
51                        thumbnail: MetadataViews.HTTPFile(
52                            url: self.metadata["thumbnail"]!
53                        )
54                    )
55            }
56
57            return nil
58        }
59
60        pub fun getRawMetadata(): {String: String} {
61            return self.metadata
62        }
63
64        destroy() {
65            emit Destroy(id: self.id)
66        }
67    }
68
69    pub resource interface CosmosCollectionPublic {
70        pub fun deposit(token: @NonFungibleToken.NFT)
71        pub fun getIDs(): [UInt64]
72        pub fun borrowNFT(id: UInt64): &NonFungibleToken.NFT
73        pub fun borrowCosmos(id: UInt64): &Cosmos.NFT? {
74            post {
75                (result == nil) || (result?.id == id):
76                    "Cannot borrow NFT reference: the ID of the returned reference is incorrect"
77            }
78        }
79    }
80
81    pub resource Collection: CosmosCollectionPublic, NonFungibleToken.Provider, NonFungibleToken.Receiver, NonFungibleToken.CollectionPublic, MetadataViews.ResolverCollection {
82        
83        pub var ownedNFTs: @{UInt64: NonFungibleToken.NFT}
84
85        init () {
86            self.ownedNFTs <- {}
87        }
88
89        // withdraw removes an NFT from the collection and moves it to the caller
90        pub fun withdraw(withdrawID: UInt64): @NonFungibleToken.NFT {
91            let token <- self.ownedNFTs.remove(key: withdrawID) ?? panic("missing NFT")
92
93            emit Withdraw(id: token.id, from: self.owner?.address)
94
95            return <-token
96        }
97
98        // deposit takes a NFT and adds it to the collections dictionary
99        // and adds the ID to the id array
100        pub fun deposit(token: @NonFungibleToken.NFT) {
101            let token <- token as! @Cosmos.NFT
102
103            let id: UInt64 = token.id
104
105            // add the new token to the dictionary which removes the old one
106            let oldToken <- self.ownedNFTs[id] <- token
107
108            emit Deposit(id: id, to: self.owner?.address)
109
110            destroy oldToken
111        }
112
113        // getIDs returns an array of the IDs that are in the collection
114        pub fun getIDs(): [UInt64] {
115            return self.ownedNFTs.keys
116        }
117
118        // borrowNFT gets a reference to an NFT in the collection
119        // so that the caller can read its metadata and call its methods
120        pub fun borrowNFT(id: UInt64): &NonFungibleToken.NFT {
121            return (&self.ownedNFTs[id] as &NonFungibleToken.NFT?)!
122        }
123
124        pub fun borrowCosmos(id: UInt64): &Cosmos.NFT? {
125            if self.ownedNFTs[id] != nil {
126                // Create an authorized reference to allow downcasting
127                let ref = &self.ownedNFTs[id] as auth &NonFungibleToken.NFT?
128                return ref as! &Cosmos.NFT?
129            }
130
131            return nil
132        }
133
134        pub fun borrowViewResolver(id: UInt64): &AnyResource{MetadataViews.Resolver} {
135            let nft = (&self.ownedNFTs[id] as auth &NonFungibleToken.NFT?)!
136            let mlNFT = nft as! &Cosmos.NFT
137            return mlNFT
138        }
139
140        destroy() {
141            destroy self.ownedNFTs
142        }
143    }
144
145    // public function that anyone can call to create a new empty collection
146    pub fun createEmptyCollection(): @NonFungibleToken.Collection {
147        return <- create Collection()
148    }
149
150    // Resource that an admin or something similar would own to be
151    // able to mint new NFTs
152    //
153    pub resource NFTMinter {
154
155        // mintNFT mints a new NFT with a new ID
156        // and deposit it in the recipients collection using their collection reference
157        pub fun mintNFT(
158            recipient: &{NonFungibleToken.CollectionPublic},
159            metadata: {String: String}
160        ): &NonFungibleToken.NFT {
161
162            let creator = self.owner!.address
163            // create a new NFT
164            var newNFT <- create NFT(
165                id: Cosmos.totalSupply,
166                creator: creator,
167                metadata: metadata
168            )
169
170            let tokenRef = &newNFT as &NonFungibleToken.NFT
171            // deposit it in the recipient's account using their reference
172            recipient.deposit(token: <-newNFT)
173
174            Cosmos.totalSupply = Cosmos.totalSupply + 1
175
176            emit Mint(id: tokenRef.id, creator: creator, metadata: metadata)
177
178            return tokenRef
179        }
180    }
181
182    init() {
183        // Initialize the total supply
184        self.totalSupply = 0
185
186        // Set the named paths
187        self.CollectionStoragePath = /storage/MatrixMarketCosmosCollection
188        self.CollectionPublicPath = /public/MatrixMarketCosmosCollection
189        self.MinterStoragePath = /storage/MatrixMarketCosmosMinter
190        self.MinterPublicPath = /public/MatrixMarketCosmosMinter
191
192        // Create a Collection resource and save it to storage
193        let collection <- create Collection()
194        self.account.save(<-collection, to: self.CollectionStoragePath)
195
196        // create a public capability for the collection
197        self.account.link<&Cosmos.Collection{NonFungibleToken.Receiver, NonFungibleToken.CollectionPublic, Cosmos.CosmosCollectionPublic, MetadataViews.ResolverCollection}>(
198            self.CollectionPublicPath,
199            target: self.CollectionStoragePath
200        )
201
202        // Create a Minter resource and save it to storage
203        let minter <- create NFTMinter()
204        self.account.save(<-minter, to: self.MinterStoragePath)
205
206        emit ContractInitialized()
207    }
208}
209