/** > Author: Fixes Lab # FixesFungibleToken This is the fungible token contract for a Mintable Fungible tokens with FixesAssetMeta. It is the template contract that is used to deploy. */ import FungibleToken from 0xf233dcee88fe0abe import ViewResolver from 0x1d7e57aa55817448 import MetadataViews from 0x1d7e57aa55817448 import FungibleTokenMetadataViews from 0xf233dcee88fe0abe import BlackHole from 0x4396883a58c3a2d1 import TokenList from 0x15a918087ab12d86 import Burner from 0xf233dcee88fe0abe // Fixes imports import Fixes from 0xd2abb5dbf5e08666 import FixesInscriptionFactory from 0xd2abb5dbf5e08666 import FixesFungibleTokenInterface from 0xd2abb5dbf5e08666 import FixesTraits from 0xd2abb5dbf5e08666 import FixesAssetMeta from 0xd2abb5dbf5e08666 import FRC20FTShared from 0xd2abb5dbf5e08666 import FRC20AccountsPool from 0xd2abb5dbf5e08666 /// This is the template source for a Fixes Fungible Token /// The contract is deployed in the child account of the FRC20AccountsPool /// The Token is issued by Minter access(all) contract FixesFungibleToken: FixesFungibleTokenInterface, FungibleToken, ViewResolver { // ------ Events ------- /// The event that is emitted when the contract is created access(all) event TokensInitialized(initialSupply: UFix64) /// The event that is emitted when new tokens are minted access(all) event TokensMinted(amount: UFix64) /// The event that is emitted when tokens are destroyed access(all) event TokensBurned(amount: UFix64) /// -------- Parameters -------- /// Total supply of FixesFungibleToken in existence /// This value is only a record of the quantity existing in the form of Flow Fungible Tokens. /// It does not represent the total quantity of the token that has been minted. /// The total quantity of the token that has been minted is loaded from the FRC20Indexer. access(all) var totalSupply: UFix64 /// -------- Resources and Interfaces -------- /// Each user stores an instance of only the Vault in their storage /// The functions in the Vault and governed by the pre and post conditions /// in FungibleToken when they are called. /// The checks happen at runtime whenever a function is called. /// /// Resources can only be created in the context of the contract that they /// are defined in, so there is no way for a malicious user to create Vaults /// out of thin air. A special Minter resource needs to be defined to mint /// new tokens. /// access(all) resource Vault: FixesFungibleTokenInterface.Vault, FungibleToken.Vault { /// The total balance of this vault access(all) var balance: UFix64 /// Metadata: Type of MergeableData => MergeableData access(contract) let metadata: {Type: {FixesTraits.MergeableData}} /// Initialize the balance at resource creation time init(balance: UFix64) { self.balance = balance self.metadata = {} // init with ExclusiveMeta, this meta will be removed if the initialize method is called let initmeta = FixesAssetMeta.ExclusiveMeta() self.metadata[initmeta.getType()] = initmeta } /// Called when a fungible token is burned via the `Burner.burn()` method /// access(contract) fun burnCallback() { if self.balance > 0.0 { // update the total supply for the FungibleToken FixesFungibleToken.totalSupply = FixesFungibleToken.totalSupply - self.balance } self.balance = 0.0 } /// createEmptyVault /// /// Function that creates a new Vault with a balance of zero /// and returns it to the calling context. A user must call this function /// and store the returned Vault in their storage in order to allow their /// account to be able to receive deposits of this token type. /// access(all) fun createEmptyVault(): @Vault { return <- FixesFungibleToken.createEmptyVault(vaultType: Type<@Vault>()) } /// ----- Internal Methods ----- /// The initialize method for the Vault /// access(contract) fun initialize( _ ins: &Fixes.Inscription?, _ owner: Address?, ) { pre { ins != nil || owner != nil: "The inscription or owner must be provided" } let fromAddr = (ins != nil ? ins!.owner?.address : owner) ?? panic("Failed to get the owner address") // remove the ExclusiveMeta let exclusiveMetaType = Type() if self.metadata[exclusiveMetaType] != nil { self.metadata.remove(key: exclusiveMetaType) } /// init DNA to the metadata self.initializeMetadata(FixesAssetMeta.DNA( self.getDNAIdentifier(), fromAddr, // if inscription exists, init the DNA with the mutatable attempts ins != nil ? self.getMaxGenerateGeneAttempts() : 0 )) } /// Set the metadata by key /// access(contract) fun initializeMetadata(_ data: {FixesTraits.MergeableData}) { let key = data.getType() self.metadata[key] = data } /// --------- Implement Metadata --------- /// /// Get the symbol of the token access(all) view fun getSymbol(): String { return FixesFungibleToken.getSymbol() } /// DNA charging /// One inscription can activate DNA mutatable attempts. /// access(all) fun chargeDNAMutatableAttempts(_ ins: auth(Fixes.Extractable) &Fixes.Inscription) { let insOwner = ins.owner?.address ?? panic("The owner of the inscription is not found") assert( insOwner == self.owner?.address, message: "The owner of the inscription is not matched" ) if !self.isValidVault() { // initialize the vault with the DNA metadata self.initialize(ins, nil) } else { // borrow the DNA metadata let dnaRef = self.borrowMergeableDataRef(Type()) ?? panic("The DNA metadata is not found") let oldValue = (dnaRef.getValue("mutatableAmount") as! UInt64?) ?? 0 // update the DNA mutatable amount let addAmt = self.getMaxGenerateGeneAttempts() dnaRef.setValue("mutatableAmount", oldValue + addAmt) } // execute the inscription FixesFungibleToken.executeInscription(ins: ins, usage: "charge") } /// --------- Implement FungibleToken.Provider --------- /// /// Asks if the amount can be withdrawn from this vault /// access(all) view fun isAvailableToWithdraw(amount: UFix64): Bool { return amount <= self.balance } /// Function that takes an amount as an argument /// and withdraws that amount from the Vault. /// It creates a new temporary Vault that is used to hold /// the money that is being transferred. It returns the newly /// created Vault to the context that called so it can be deposited /// elsewhere. /// /// @param amount: The amount of tokens to be withdrawn from the vault /// @return The Vault resource containing the withdrawn funds /// access(FungibleToken.Withdraw) fun withdraw(amount: UFix64): @{FungibleToken.Vault} { pre { self.isAvailableToWithdraw(amount: amount): "The amount withdrawn must be less than or equal to the balance" } let oldBalance = self.balance // update the balance self.balance = self.balance - amount // initialize the new vault with the amount let newVault <- create Vault(balance: amount) // if current vault is valid vault(with DNA) if self.isValidVault() { newVault.initialize(nil, self.getDNAOwner()) } // check if the vault has PureVault let isPureVault = self.borrowMergeableDataRef(Type()) != nil // update metadata if the vault is not PureVault if !isPureVault { // setup mergeable data, split from withdraw percentage let percentage = amount / oldBalance let mergeableKeys = self.getMergeableKeys() for key in mergeableKeys { if let dataRef = self.borrowMergeableDataRef(key) { let splitData = dataRef.split(percentage) newVault.metadata[key] = splitData // emit the event FixesFungibleToken.emitMetadataUpdated( &self as auth(FixesFungibleTokenInterface.MetadataUpdate) &{FixesFungibleTokenInterface.Vault}, dataRef ) } } // Is the vault has DNA, then attempt to generate a new gene self._attemptGenerateGene(amount, oldBalance) } // update the balance ranking let ownerAddr = self.owner?.address if ownerAddr != nil { let adminRef = FixesFungibleToken.borrowAdminPublic() let lastTopHolder = adminRef.getLastTopHolder() if lastTopHolder != ownerAddr || lastTopHolder == nil { let lastTopBalance = lastTopHolder != nil ? FixesFungibleToken.getTokenBalance(lastTopHolder!) : 0.0 if lastTopBalance == 0.0 || (lastTopBalance > self.balance && adminRef.isInTop100(ownerAddr!)) { adminRef.onBalanceChanged(ownerAddr!) } } // if balance is greater than 0, then update the token holder if self.balance > 0.0 && !adminRef.isTokenHolder(ownerAddr!) { adminRef.onTokenDeposited(ownerAddr!) } } return <- newVault } /// --------- Implement FungibleToken.Receiver --------- /// /// Function that takes a Vault object as an argument and adds /// its balance to the balance of the owners Vault. /// It is allowed to Burner.burn(the sent Vault because the Vault /// was a temporary holder of the tokens. The Vault's balance has /// been consumed and therefore can be destroyed. /// /// @param from: The Vault resource containing the funds that will be deposited /// access(all) fun deposit(from: @{FungibleToken.Vault}) { // the interface ensured that the vault is of the same type // so we can safely cast it let vault <- from as! @FixesFungibleToken.Vault // try to get the current owner of the DNA let selfOwner = self.owner?.address let dnaOwner = vault.getDNAOwner() let currentOwner = selfOwner ?? dnaOwner // initialize current vault if it is not initialized if !self.isValidVault() && currentOwner != nil { self.initialize(nil, currentOwner!) } // check if the vault has PureVault let isPureVault = self.borrowMergeableDataRef(Type()) != nil // update metadata if the vault is not PureVault if !isPureVault { // merge the metadata let keys = vault.getMergeableKeys() for key in keys { let data = vault.getMergeableData(key)! if let selfData = self.borrowMergeableDataRef(key) { selfData.merge(data) } else { self.metadata[key] = data } let dataRef = self.borrowMergeableDataRef(key)! // emit the event FixesFungibleToken.emitMetadataUpdated( &self as auth(FixesFungibleTokenInterface.MetadataUpdate) &{FixesFungibleTokenInterface.Vault}, dataRef ) } } // record the deposited balance let depositedBalance = vault.balance // update the balance self.balance = self.balance + vault.balance // reset the balance of the from vault vault.balance = 0.0 // vault is useless now Burner.burn(<- vault) // update metadata if the vault is not PureVault if !isPureVault { // Is the vault has DNA, then attempt to generate a new gene self._attemptGenerateGene(depositedBalance, self.balance) } // update the balance ranking let ownerAddr = self.owner?.address if ownerAddr != nil { let adminRef = FixesFungibleToken.borrowAdminPublic() let lastTopHolder = adminRef.getLastTopHolder() if lastTopHolder != ownerAddr || lastTopHolder == nil { let lastTopBalance = lastTopHolder != nil ? FixesFungibleToken.getTokenBalance(lastTopHolder!) : 0.0 if lastTopBalance < self.balance { adminRef.onBalanceChanged(ownerAddr!) } } } } /// --------- Implement ViewResolver.Resolver --------- /// /// The way of getting all the Metadata Views implemented by FixesFungibleToken /// /// @return An array of Types defining the implemented views. This value will be used by /// developers to know which parameter to pass to the resolveView() method. /// access(all) view fun getViews(): [Type] { let contractViews = FixesFungibleToken.getContractViews(resourceType: Type<@Vault>()) return contractViews } /// The way of getting a Metadata View out of the FixesFungibleToken /// /// @param view: The Type of the desired view. /// @return A structure representing the requested view. /// access(all) fun resolveView(_ view: Type): AnyStruct? { return FixesFungibleToken.resolveContractView(resourceType: nil, viewType: view) } /// --------- Internal Methods --------- /// /// Borrow the mergeable data by key /// access(contract) view fun borrowMergeableDataRef(_ type: Type): auth(FixesTraits.Write) &{FixesTraits.MergeableData}? { return &self.metadata[type] } /// Attempt to generate a new gene, Max attempts is 10 /// access(self) fun _attemptGenerateGene(_ transactedAmt: UFix64, _ totalAmt: UFix64) { log("-> Attempt to generate gene:" .concat(" Owner: ").concat(self.owner?.address?.toString() ?? "Unknown") .concat(" Valid: ").concat(self.isValidVault() ? "true" : "false") .concat(" DNA: ").concat(self.getDNAIdentifier()) .concat(" Mutatable: ").concat(self.getDNAMutatableAmount().toString()) .concat(" Transacted: ").concat(transactedAmt.toString()) .concat(" Total: ").concat(totalAmt.toString())) let remainingAmt = self.getDNAMutatableAmount() if !self.isValidVault() || remainingAmt == 0 || transactedAmt == 0.0 || totalAmt == 0.0 { return } // every 10% of balance change will get a new attempt to mutate the DNA // attempt to generate a new gene self.attemptGenerateGene(remainingAmt) } } /// The interface for the FungibleTokenAdmin's global internal writable methods /// access(all) resource interface GlobalInternalWritable { /// update the token holder access(contract) fun onTokenDeposited(_ address: Address): Bool /// update the balance ranking access(contract) fun onBalanceChanged(_ address: Address): Bool } /// The admin resource for the FRC20 FT /// access(all) resource FungibleTokenAdmin: GlobalInternalWritable, FixesFungibleTokenInterface.IGlobalPublic, FixesFungibleTokenInterface.IMinterHolder, FixesFungibleTokenInterface.IAdminWritable { access(self) let minter: @Minter /// The amount of tokens that all created minters are allowed to mint access(self) var grantedMintableAmount: UFix64 /// The top 100 accounts sorted by balance access(self) let top100Accounts: [Address] /// All token holders access(self) let tokenHolders: {Address: Bool} /// All authorized users access(self) let authorizedUsers: {Address: Bool} init() { self.minter <- create Minter(allowedAmount: nil) self.grantedMintableAmount = 0.0 self.top100Accounts = [] self.authorizedUsers = {} self.tokenHolders = {} } // ----- Implement AdminInterface ----- access(all) view fun isAuthorizedUser(_ addr: Address): Bool { return self.authorizedUsers[addr] == true } /// Mint new tokens /// access(all) view fun getGrantedMintableAmount(): UFix64 { return self.grantedMintableAmount } /// Get the top 100 sorted array of holders, descending by balance /// access(all) view fun getEstimatedTop100Holders(): [Address]? { return self.top100Accounts } /// Get the top 1 holder /// access(all) view fun getTop1Holder(): Address? { if self.top100Accounts.length > 0 { return self.top100Accounts[0] } return nil } /// Get the last top holder /// access(all) view fun getLastTopHolder(): Address? { if self.top100Accounts.length > 0 { return self.top100Accounts[self.top100Accounts.length - 1] } return nil } /// Check if the address is in the top 100 /// access(all) view fun isInTop100(_ address: Address): Bool { return self.top100Accounts.contains(address) } /// Check if the address is the token holder access(all) view fun isTokenHolder(_ addr: Address): Bool { return self.tokenHolders[addr] == true } /// Get the holders amount access(all) view fun getHoldersAmount(): UInt64 { return UInt64(self.tokenHolders.length) } /// update the token holder access(contract) fun onTokenDeposited(_ address: Address): Bool { var isUpdated = false if self.tokenHolders[address] == nil { self.tokenHolders[address] = true isUpdated = true } return isUpdated } /// update the balance ranking /// access(contract) fun onBalanceChanged(_ address: Address): Bool { log("onBalanceChanged - Start - ".concat(address.toString())) // remove the address from the top 100 if let idx = self.top100Accounts.firstIndex(of: address) { self.top100Accounts.remove(at: idx) } // now address is not in the top 100, we need to check balance and insert it let balance = FixesFungibleToken.getTokenBalance(address) var highBalanceIdx = 0 var lowBalanceIdx = self.top100Accounts.length - 1 // use binary search to find the position while lowBalanceIdx >= highBalanceIdx { let mid = (lowBalanceIdx + highBalanceIdx) / 2 let midBalance = FixesFungibleToken.getTokenBalance(self.top100Accounts[mid]) // find the position if balance > midBalance { lowBalanceIdx = mid - 1 } else if balance < midBalance { highBalanceIdx = mid + 1 } else { break } } // insert the address self.top100Accounts.insert(at: highBalanceIdx, address) log("onBalanceChanged - End - ".concat(address.toString()) .concat(" balance: ").concat(balance.toString()) .concat(" rank: ").concat(highBalanceIdx.toString())) // remove the last one if the length is greater than 100 if self.top100Accounts.length > 100 { self.top100Accounts.removeLast() } return true } // ----- Implement IMinterHolder ----- /// Borrow the minter reference /// access(contract) view fun borrowMinter(): auth(FixesFungibleTokenInterface.Manage) &Minter { return self.borrowSuperMinter() } // ------ Implement IAdminWritable ------ /// Create a new Minter resource /// access(FixesFungibleTokenInterface.Manage) fun createMinter(allowedAmount: UFix64): @Minter { let minter <- create Minter(allowedAmount: allowedAmount) self.grantedMintableAmount = self.grantedMintableAmount + allowedAmount return <- minter } /// Update the authorized users /// access(FixesFungibleTokenInterface.Manage) fun updateAuthorizedUsers(_ addr: Address, _ isAdd: Bool) { self.authorizedUsers[addr] = isAdd } /// Borrow the super minter resource /// access(FixesFungibleTokenInterface.Manage) view fun borrowSuperMinter(): auth(FixesFungibleTokenInterface.Manage) &Minter { return &self.minter } } /// Resource object that token admin accounts can hold to mint new tokens. /// access(all) resource Minter: FixesFungibleTokenInterface.IMinter { /// The total allowed amount of the minting token, if nil means unlimited access(all) let totalAllowedAmount: UFix64? /// The amount of tokens that the minter is allowed to mint access(all) var allowedAmount: UFix64? init(allowedAmount: UFix64?) { self.totalAllowedAmount = allowedAmount self.allowedAmount = allowedAmount } // ----- Implement IMinter ----- /// Get the symbol of the minting token /// access(all) view fun getSymbol(): String { return FixesFungibleToken.getSymbol() } /// Get the type of the minting token access(all) view fun getTokenType(): Type { return Type<@FixesFungibleToken.Vault>() } /// Get the key in the accounts pool access(all) view fun getAccountsPoolKey(): String? { return "$".concat(self.getSymbol()) } /// Get the contract address of the minting token access(all) view fun getContractAddress(): Address { return FixesFungibleToken.getAccountAddress() } /// Get the max supply of the minting token access(all) view fun getMaxSupply(): UFix64 { return FixesFungibleToken.getMaxSupply() ?? UFix64.max } /// Get the total supply of the minting token /// access(all) view fun getTotalSupply(): UFix64 { return FixesFungibleToken.getTotalSupply() } /// Get the current mintable amount /// access(all) view fun getCurrentMintableAmount(): UFix64 { return self.allowedAmount ?? self.getUnsuppliedAmount() } /// Get the total allowed mintable amount /// access(all) view fun getTotalAllowedMintableAmount(): UFix64 { return self.totalAllowedAmount ?? self.getMaxSupply() } /// Get the vault data of the minting token /// access(all) fun getVaultData(): FungibleTokenMetadataViews.FTVaultData { return FixesFungibleToken.resolveContractView(resourceType: nil, viewType: Type()) as! FungibleTokenMetadataViews.FTVaultData? ?? panic("The vault data is not found") } /// Function that mints new tokens, adds them to the total supply, /// and returns them to the calling context. /// /// @param amount: The quantity of tokens to mint /// @return The Vault resource containing the minted tokens /// access(FixesFungibleTokenInterface.Manage) fun mintTokens(amount: UFix64): @FixesFungibleToken.Vault { pre { amount > 0.0: "Amount minted must be greater than zero" self.allowedAmount == nil || amount <= self.allowedAmount!: "Amount minted must be less than the allowed amount" } if self.allowedAmount != nil { self.allowedAmount = self.allowedAmount! - amount } let newVault <- create Vault(balance: amount) FixesFungibleToken.totalSupply = FixesFungibleToken.totalSupply + amount emit TokensMinted(amount: amount) return <- newVault } /// Mint tokens with user's inscription /// access(FixesFungibleTokenInterface.Manage) fun initializeVaultByInscription( vault: @{FungibleToken.Vault}, ins: auth(Fixes.Extractable) &Fixes.Inscription ): @{FungibleToken.Vault} { pre { vault.isInstance(Type<@FixesFungibleToken.Vault>()): "The vault must be an instance of FixesFungibleToken.Vault" } post { before(vault.balance) == result.balance: "The vault balance must be the same" } let typedVault <- vault as! @FixesFungibleToken.Vault // ensure vault is initialized if !typedVault.isValidVault() { if ins.isExtractable() { typedVault.initialize(ins, nil) // execute the inscription FixesFungibleToken.executeInscription(ins: ins, usage: "init") } else { typedVault.initialize(nil, ins.owner?.address) } } return <- typedVault } /// Burn tokens with user's inscription /// access(FixesFungibleTokenInterface.Manage) fun burnTokenWithInscription( vault: @{FungibleToken.Vault}, ins: auth(Fixes.Extractable) &Fixes.Inscription ) { pre { vault.isInstance(Type<@FixesFungibleToken.Vault>()): "The vault must be an instance of FixesFungibleToken.Vault" } // execute the inscription if ins.isExtractable() { FixesFungibleToken.executeInscription(ins: ins, usage: "burn") } Burner.burn(<- vault) } } /// ------------ Internal Methods ------------ /// Exuecte and extract FlowToken in the inscription /// access(contract) fun executeInscription(ins: auth(Fixes.Extractable) &Fixes.Inscription, usage:String) { let meta = FixesInscriptionFactory.parseMetadata(ins.borrowData()) assert( meta["usage"] == usage || meta["usage"] == "*", message: "The inscription usage must be ".concat(usage) ) let tick = meta["tick"] ?? panic("The ticker name is not found") assert( tick.length > 0 && tick[0] == "$" && tick == "$".concat(self.getSymbol()), message: "The ticker name is not matched" ) // register token to the tokenlist TokenList.ensureFungibleTokenRegistered(self.account.address, "FixesFungibleToken") // execute the inscription let acctsPool = FRC20AccountsPool.borrowAccountsPool() acctsPool.executeInscription(type: FRC20AccountsPool.ChildAccountType.FungibleToken, ins) } /// ------------ General Functions ------------ /// Function that creates a new Vault with a balance of zero /// and returns it to the calling context. A user must call this function /// and store the returned Vault in their storage in order to allow their /// account to be able to receive deposits of this token type. /// /// @return The new Vault resource /// access(all) fun createEmptyVault(vaultType: Type): @Vault { return <-create Vault(balance: 0.0) } /// Function that resolves a metadata view for this contract. /// /// @param view: The Type of the desired view. /// @return A structure representing the requested view. /// access(all) fun resolveContractView(resourceType: Type?, viewType: Type): AnyStruct? { // external url let externalUrl = FixesFungibleToken.getExternalUrl() switch viewType { case Type(): return externalUrl != nil ? MetadataViews.ExternalURL(externalUrl!) : MetadataViews.ExternalURL("https://fixes.world/") case Type(): return FungibleTokenMetadataViews.FTView( ftDisplay: self.resolveContractView(resourceType: nil, viewType: Type()) as! FungibleTokenMetadataViews.FTDisplay?, ftVaultData: self.resolveContractView(resourceType: nil, viewType: Type()) as! FungibleTokenMetadataViews.FTVaultData? ) case Type(): let store = FixesFungibleToken.borrowSharedStore() let tick = FixesFungibleToken.getSymbol() // medias let medias: [MetadataViews.Media] = [] let logoKey = store.getKeyByEnum(FRC20FTShared.ConfigType.FungibleTokenLogoPrefix)! if let iconUrl = store.get(logoKey) as! String? { medias.append(MetadataViews.Media( file: MetadataViews.HTTPFile(url: iconUrl), mediaType: "image/png" // default is png )) } if let iconUrl = store.get(logoKey.concat("png")) as! String? { medias.append(MetadataViews.Media( file: MetadataViews.HTTPFile(url: iconUrl), mediaType: "image/png" )) } if let iconUrl = store.get(logoKey.concat("svg")) as! String? { medias.append(MetadataViews.Media( file: MetadataViews.HTTPFile(url: iconUrl), mediaType: "image/svg+xml" )) } if let iconUrl = store.get(logoKey.concat("jpg")) as! String? { medias.append(MetadataViews.Media( file: MetadataViews.HTTPFile(url: iconUrl), mediaType: "image/jpeg" )) } if let iconUrl = store.get(logoKey.concat("gif")) as! String? { medias.append(MetadataViews.Media( file: MetadataViews.HTTPFile(url: iconUrl), mediaType: "image/gif" )) } // socials let socialDict: {String: MetadataViews.ExternalURL} = {} let socialKey = store.getKeyByEnum(FRC20FTShared.ConfigType.FungibleTokenSocialPrefix)! // load social infos if let socialUrl = store.get(socialKey.concat("twitter")) { socialDict["twitter"] = MetadataViews.ExternalURL((socialUrl as! String?)!) } if let socialUrl = store.get(socialKey.concat("telegram")) { socialDict["telegram"] = MetadataViews.ExternalURL((socialUrl as! String?)!) } if let socialUrl = store.get(socialKey.concat("discord")) { socialDict["discord"] = MetadataViews.ExternalURL((socialUrl as! String?)!) } if let socialUrl = store.get(socialKey.concat("github")) { socialDict["github"] = MetadataViews.ExternalURL((socialUrl as! String?)!) } // override all customized fields return FungibleTokenMetadataViews.FTDisplay( name: FixesFungibleToken.getDisplayName() ?? tick, symbol: tick, description: FixesFungibleToken.getTokenDescription() ?? "No description", externalURL: externalUrl != nil ? MetadataViews.ExternalURL(externalUrl!) : MetadataViews.ExternalURL("https://linktr.ee/fixes.world/"), logos: medias.length > 0 ? MetadataViews.Medias(medias) : MetadataViews.Medias([]), socials: socialDict ) case Type(): let prefix = FixesFungibleToken.getPathPrefix() return FungibleTokenMetadataViews.FTVaultData( storagePath: FixesFungibleToken.getVaultStoragePath(), receiverPath: FixesFungibleToken.getReceiverPublicPath(), metadataPath: FixesFungibleToken.getVaultPublicPath(), receiverLinkedType: Type<&{FungibleToken.Receiver}>(), metadataLinkedType: Type<&FixesFungibleToken.Vault>(), createEmptyVaultFunction: (fun (): @FixesFungibleToken.Vault { return <-FixesFungibleToken.createEmptyVault(vaultType: Type<@Vault>()) }) ) case Type(): return FungibleTokenMetadataViews.TotalSupply( totalSupply: FixesFungibleToken.totalSupply ) } return nil } /// Function that returns all the Metadata Views implemented by a Fungible Token /// /// @return An array of Types defining the implemented views. This value will be used by /// developers to know which parameter to pass to the resolveView() method. /// access(all) view fun getContractViews(resourceType: Type?): [Type] { return [ Type(), Type(), Type(), Type(), Type() ] } /// the real total supply is loaded from the FRC20Indexer /// access(all) view fun getTotalSupply(): UFix64 { return self.totalSupply } /// Get the prefix for the storage paths /// access(all) view fun getPathPrefix(): String { return "FixsStandardFT_".concat(self.account.address.toString()).concat(self.getSymbol()).concat("_") } /// Borrow the admin public reference /// access(contract) view fun borrowAdminPublic(): &FungibleTokenAdmin { return self.account .capabilities.get<&FungibleTokenAdmin>(self.getAdminPublicPath()) .borrow() ?? panic("The FungibleToken Admin is not found") } /// Initialize the contract with ticker name /// init() { // Initialize self.totalSupply = 0.0 // Emit an event that shows that the contract was initialized emit TokensInitialized(initialSupply: self.totalSupply) // Singleton resources let globalStore = FRC20FTShared.borrowGlobalStoreRef() let acctsPool = FRC20AccountsPool.borrowAccountsPool() let isSysmtemDeploy = self.account.address == globalStore.owner?.address if isSysmtemDeploy { // DO NOTHING, It will be a template contract for deploying new FRC20 Fungible tokens return } // Step.0 Ensure shared store exists // Initialize the shared store if self.account.storage.borrow<&AnyResource>(from: FRC20FTShared.SharedStoreStoragePath) == nil { let sharedStore <- FRC20FTShared.createSharedStore() self.account.storage.save(<- sharedStore, to: FRC20FTShared.SharedStoreStoragePath) } // link the resource to the public path if self.account .capabilities.get<&FRC20FTShared.SharedStore>(FRC20FTShared.SharedStorePublicPath) .borrow() == nil { self.account.capabilities.unpublish(FRC20FTShared.SharedStorePublicPath) self.account.capabilities.publish( self.account.capabilities.storage.issue<&FRC20FTShared.SharedStore>(FRC20FTShared.SharedStoreStoragePath), at: FRC20FTShared.SharedStorePublicPath ) } // borrow the shared store let store = self.account.storage .borrow(from: FRC20FTShared.SharedStoreStoragePath) ?? panic("The shared store is not found") // Step.1 Try get the ticker name from the shared store var tickerName = store.getByEnum(FRC20FTShared.ConfigType.FungibleTokenSymbol) as! String? if tickerName == nil { var fixesFTKey: String? = nil // try load the ticker name from AccountPools let addrDict = acctsPool.getAddresses(type: FRC20AccountsPool.ChildAccountType.FungibleToken) let contractAddr = self.account.address addrDict.forEachKey(fun (key: String): Bool { if let addr = addrDict[key] { if addr == contractAddr { fixesFTKey = key return false } } return true }) // set the ticker name if let foundKey = fixesFTKey { assert( foundKey[0] == "$", message: "The ticker name is invalid." ) tickerName = foundKey.slice(from: 1, upTo: foundKey.length) store.setByEnum(FRC20FTShared.ConfigType.FungibleTokenSymbol, value: tickerName!) } } assert( tickerName != nil, message: "The ticker name is not found" ) log("Init the Fungible Token symbol:".concat(tickerName!)) // setup admin resource let admin <- create FungibleTokenAdmin() let adminStoragePath = self.getAdminStoragePath() self.account.storage.save(<-admin, to: adminStoragePath) // link the admin resource to the public path let adminPublicPath = self.getAdminPublicPath() self.account.capabilities.publish( self.account.capabilities.storage.issue<&FungibleTokenAdmin>(adminStoragePath), at: adminPublicPath ) // ensure the admin resource exists let adminRef = self.account.storage .borrow(from: adminStoragePath) ?? panic("The FungibleToken Admin is not found") let deployer = self.getDeployerAddress() // add the deployer as the authorized user adminRef.updateAuthorizedUsers(deployer, true) // Step.2 Setup the vault and receiver for the contract account let storagePath = self.getVaultStoragePath() let publicPath = self.getVaultPublicPath() let receiverPath = self.getReceiverPublicPath() // Create the Vault with the total supply of tokens and save it in storage. let vault <- create Vault(balance: self.totalSupply) self.account.storage.save(<-vault, to: storagePath) // Create a public capability to the stored Vault that exposes // the `deposit` method through the `Receiver` interface. self.account.capabilities.publish( self.account.capabilities.storage.issue<&{FungibleToken.Receiver}>(storagePath), at: receiverPath ) // Create a public capability to the stored Vault that only exposes // the `balance` field and the `resolveView` method through the `Balance` interface self.account.capabilities.publish( self.account.capabilities.storage.issue<&FixesFungibleToken.Vault>(storagePath), at: publicPath ) } }

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