alchemy-flow-contracts

To set up this repo on your machine:

1. Clone the repo
2. Install flow-cli to run Cadence scripts directly brew install flow-cli
3. This repo supports contracts on Flow mainnet only

Running the code

GetNFTIDs.cdc

This script returns all the NFT IDs belonging to a particular account

flow scripts execute getNFTIDs.cdc 0x9eef2e4511390ce4 --network mainnet

Output:

Result: {"Gaia": [1117, 2817, 4029, 6649, 7990, 8033, 1114, 1115, 1125, 1136, 1137, 1122, 1124, 1132, 1134, 1145, 1147, 1150, 1121, 1130, 1151, 1119, 1128, 1135, 1113, 1127, 1133, 1116, 1143, 1149, 1126, 1131, 1139, 1142, 1144, 1146, 1112, 1118, 1123, 1129, 1141, 1153, 1120, 1111, 1107, 1108, 1109, 1110]}

GetNFTs.cdc

This script returns the NFT metadata for the given contract and NFT ID. The input is a dictionary of contract names as keys and array of NFT IDs for the value.

flow scripts execute getNFTs.cdc --args-json '[{ "type": "Address", "value": "0x9eef2e4511390ce4" }, { "type": "Dictionary", "value": [{ "key": { "type": "String", "value": "Gaia" }, "value": { "type": "Array", "value": [{ "type": "UInt64", "value": "1129" }] } }] }]' --network mainnet

Output:

Result: [s.1a80e96259b9dd336bf3c2527c515f2713e46b64b482de17986fd3c4af90b633.NFTData(contract: s.1a80e96259b9dd336bf3c2527c515f2713e46b64b482de17986fd3c4af90b633.NFTContract(name: "Gaia", address: 0x8b148183c28ff88f, storage_path: "Gaia.CollectionStoragePath", public_path: "Gaia.CollectionPublicPath", public_collection_name: "Gaia.CollectionPublic", external_domain: "ballerz.xyz"), id: 1129, uuid: 74658161, title: "BALLER #1024", description: "A basketball-inspired generative NFT living on the Flow blockchain", external_domain_view_url: "/collection/ballerz//1024", media: s.1a80e96259b9dd336bf3c2527c515f2713e46b64b482de17986fd3c4af90b633.NFTMedia(uri: "ipfs://QmaUhmEgy5Znagz2ayY2uyn5Xdbsvzm8PkBM1GghtsXihv/1024.png", mimetype: "image"), alternate_media: [], metadata: {"id": "1024", "body": "Human I", "team": "Los Angeles Knives", "accessories": "Pencil", "jersey": "Home", "hair": "Pink Pigtails", "role": "Player", "number": "67", "dunks": "85", "shooting": "85", "playmaking": "82", "defense": "87", "img": "ipfs://QmaUhmEgy5Znagz2ayY2uyn5Xdbsvzm8PkBM1GghtsXihv/1024.png", "title": "BALLER #1024", "description": "A basketball-inspired generative NFT living on the Flow blockchain", "uri": "/collection/ballerz//1024"})]

Adding a new contract

1. Update https://github.com/alchemyplatform/alchemy-flow-contracts/blob/main/src/cadence/scripts/getNFTIDs.cdc to return the list of NFT IDs for the new contract

   a. Add contract import statement

   import Gaia from 0x8b148183c28ff88f
   

   b. Borrow the collection resource which is defined in the NFT by the Collection interface and return all nft ids:

   if let col = owner.getCapability(Gaia.CollectionPublicPath)
       .borrow<&{Gaia.CollectionPublic}>() {
           ids["Gaia"] = col.getIDs()
       }
   

2. Add a new function in https://github.com/alchemyplatform/alchemy-flow-contracts/blob/main/src/cadence/scripts/getNFTs.cdc to retrieve NFT metadata given an NFT ID.

   a. Add contract import statement

   import Gaia from 0x8b148183c28ff88f
   

   b. Add a new function to deserialize NFT metadata into the generic Alchemy metadata schema defined below.

   case "Gaia": d = getGaia(owner: owner, id: id)
   

   // https://flow-view-source.com/mainnet/account/0x8b148183c28ff88f/contract/Gaia
   // https://flow-view-source.com/testnet/account/0xc523a8bbf10fc4a3/contract/Gaia
   pub fun getGaia(owner: PublicAccount, id: UInt64): NFTData? {
   
       let contract = NFTContract(
           name: "Gaia",
           address: 0x8b148183c28ff88f,
           storage_path: "Gaia.CollectionPath",
           public_path: "Gaia.CollectionPublicPath",
           public_collection_name: "Gaia.CollectionPublic",
           external_domain: "ballerz.xyz"
       )
   
       let col = owner.getCapability(Gaia.CollectionPublicPath)
           .borrow<&{Gaia.CollectionPublic}>()
   
       if col == nil { return nil }
   
       let nft = col!.borrowGaiaNFT(id: id)
       if nft == nil { return nil }
   
       let metadata = Gaia.getTemplateMetaData(templateID: nft!.data.templateID)
   
       return NFTData(
           contract: contract,
           id: nft!.id,
           uuid: nft!.uuid,
           title: metadata!["title"],
           description: metadata!["description"],
           external_domain_view_url: metadata!["uri"],
           media: NFTMedia(uri: metadata!["img"], mimetype: "image"),
           alternate_media: [],
           metadata: metadata!,
       )
   }
   

   c. Add a test case for your newly added contract here: https://github.com/alchemyplatform/alchemy-flow-contracts/blob/main/src/cadence/scripts/getNFTs.cdc

   sh testGetNFTs.sh Gaia
   

Alchemy Metadata Schema

We will take a look at each data an describe its purpose.

Collection

pub struct Collection {
    pub let owner: Address // address of the owner of NFT
    pub let nfts: [NFT] // collection of NFT data
}

NFT metadata

pub struct NFT {
    pub let contract: Contract // contract defined bellow
    pub let id: UInt64 // id of the nft usually just nft.id
    pub let uuid: UInt64? // uuid of the nft usually just nft.uuid
    pub let title: String? // title of the nft
    pub let description: String? // description of the nft
    pub let external_domain_view_url: String? // api for nft view resource
    pub let media: Media? // media defined bellow used as avatar of nft
    pub let alternate_media: [Media?] // alternative media to the primary media above
    pub let metadata: {String: AnyStruct} // all the metadata in raw
}

Contract data

pub struct Contract {
    pub let name: String // name of the contract
    pub let address: Address // address of the contract
    pub let external_domain: String // domain of the project
}

Media data

pub struct Media {
    pub let uri: String? // uri location of the media resource
    pub let mimetype: String? // mime type of the nft
}