import NonFungibleToken from 0x1d7e57aa55817448 import MetadataViews from 0x1d7e57aa55817448 access(all) contract NFTMetadata { access(all) entitlement Owner access(all) event MetadataFrozen(uuid: UInt64, owner: Address?) access(all) struct CollectionInfo { access(all) var collectionDisplay: MetadataViews.NFTCollectionDisplay access(all) let data: {String: AnyStruct} access(all) fun getDisplay(): MetadataViews.NFTCollectionDisplay { return self.collectionDisplay } init(collectionDisplay: MetadataViews.NFTCollectionDisplay) { self.collectionDisplay = collectionDisplay self.data = {} } } access(all) struct Metadata { // these are used to create the display metadata view so that we can concatenate // the id onto it. access(all) let name: String access(all) let description: String access(all) let thumbnail: {MetadataViews.File} access(all) let traits: MetadataViews.Traits? access(all) let editions: MetadataViews.Editions? access(all) let externalURL: MetadataViews.ExternalURL? access(all) let royalties: MetadataViews.Royalties? access(all) let data: {String: AnyStruct} access(all) fun getThumbnail(): {MetadataViews.File} { return self.thumbnail } access(all) fun getTraits(): MetadataViews.Traits? { return self.traits } access(all) fun getEditions(): MetadataViews.Editions? { return self.editions } access(all) fun getExternalURL(): MetadataViews.ExternalURL? { return self.externalURL } access(all) fun getRoyalties(): MetadataViews.Royalties? { return self.royalties } init( name: String, description: String, thumbnail: {MetadataViews.File}, traits: MetadataViews.Traits?, editions: MetadataViews.Editions?, externalURL: MetadataViews.ExternalURL?, royalties: MetadataViews.Royalties?, data: {String: AnyStruct} ) { self.name = name self.description = description self.thumbnail = thumbnail self.traits = traits self.editions = editions self.externalURL = externalURL self.royalties = royalties self.data = {} } } access(all) resource Container { access(all) var collectionInfo: CollectionInfo access(all) let metadata: {UInt64: Metadata} access(all) var frozen: Bool access(all) let data: {String: AnyStruct} access(all) let resources: @{String: AnyResource} access(all) fun borrowMetadata(id: UInt64): &Metadata? { return &self.metadata[id] } access(Owner) fun addMetadata(id: UInt64, data: Metadata) { pre { self.metadata[id] == nil: "id already has metadata assigned" !self.frozen: "metadata is frozen and cannot be updated" } self.metadata[id] = data } access(Owner) fun freeze() { self.frozen = true emit MetadataFrozen(uuid: self.uuid, owner: self.owner?.address) } init(collectionInfo: CollectionInfo) { self.collectionInfo = collectionInfo self.metadata = {} self.frozen = false self.data = {} self.resources <- {} } } access(all) struct InitializedCaps { access(all) let pubCap: Capability<&Container> access(all) let ownerCap: Capability access(all) let data: {String: AnyStruct} init(pubCap: Capability<&Container>, ownerCap: Capability) { self.pubCap = pubCap self.ownerCap = ownerCap self.data = {} } } access(all) fun createContainer(collectionInfo: CollectionInfo): @Container { return <- create Container(collectionInfo: collectionInfo) } access(all) fun initialize(acct: auth(Storage, Capabilities) &Account, collectionInfo: CollectionInfo, nftType: Type): InitializedCaps { let storagePath = self.getCollectionStoragePath(type: nftType) let container <- self.createContainer(collectionInfo: collectionInfo) acct.storage.save(<-container, to: storagePath) let pubCap = acct.capabilities.storage.issue<&Container>(storagePath) let ownerCap = acct.capabilities.storage.issue(storagePath) return InitializedCaps(pubCap: pubCap, ownerCap: ownerCap) } access(all) struct UriFile: MetadataViews.File { access(self) let url: String access(all) view fun uri(): String { return self.url } init(_ url: String) { self.url = url } } access(all) fun getCollectionStoragePath(type: Type): StoragePath { let segments = type.identifier.split(separator: ".") return StoragePath(identifier: "NFTMetadataContainer_".concat(segments[2]).concat("_").concat(segments[1]))! } }

Contract