Merge pull request #183 from onflow/nialexsan/fyv-v2-strategy-deployment

PYUSD0 WFLOW strategies v2

Author: nialexsan

cadence/contracts/FlowYieldVaultsStrategiesV2.cdc

@@ -0,0 +1,33 @@
+import "FungibleToken"
+import "FungibleTokenMetadataViews"
+import "ViewResolver"
+
+/// Returns the Cadence FungibleToken balance for the given account, resolving the
+/// vault's public metadata path dynamically via the FTVaultData metadata view.
+///
+/// Useful for checking balances of VM-bridged ERC-20 tokens without hard-coding public paths.
+///
+/// @param address:         The account address to check
+/// @param vaultIdentifier: The Cadence type identifier (e.g. "A.1e4aa0b87d10b141.EVMVMBridgedToken_...Vault")
+/// @return UFix64?:        The vault balance, or nil if the vault is not set up for this account
+///
+access(all) fun main(address: Address, vaultIdentifier: String): UFix64? {
+    let vaultType = CompositeType(vaultIdentifier)
+    if vaultType == nil { return nil }
+
+    let contractAddr = vaultType!.address
+    if contractAddr == nil { return nil }
+    let contractName = vaultType!.contractName
+    if contractName == nil { return nil }
+
+    let viewResolver = getAccount(contractAddr!).contracts.borrow<&{ViewResolver}>(name: contractName!)
+    if viewResolver == nil { return nil }
+
+    let vaultData = viewResolver!.resolveContractView(
+        resourceType: vaultType!,
+        viewType: Type<FungibleTokenMetadataViews.FTVaultData>()
+    ) as? FungibleTokenMetadataViews.FTVaultData
+    if vaultData == nil { return nil }
+
+    return getAccount(address).capabilities.borrow<&{FungibleToken.Vault}>(vaultData!.metadataPath)?.balance
+}