From 262cd43218aa237fcb97e1fe93c7e3d02caa1f1f Mon Sep 17 00:00:00 2001
From: Tang Bo Hao <tech@btang.cn>
Date: Tue, 22 Oct 2024 16:25:38 +0800
Subject: [PATCH] feat: add a new transaction for creating new account with coa

- Mainly from the usage of CEXs
---
 .../evm/create_new_account_with_coa.cdc       | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 cadence/transactions/evm/create_new_account_with_coa.cdc

diff --git a/cadence/transactions/evm/create_new_account_with_coa.cdc b/cadence/transactions/evm/create_new_account_with_coa.cdc
new file mode 100644
index 00000000..512898bb
--- /dev/null
+++ b/cadence/transactions/evm/create_new_account_with_coa.cdc
@@ -0,0 +1,64 @@
+import Crypto
+
+import "EVM"
+
+/// Creates a new Flow Address and EVM account with a Cadence Owned Account (COA) stored in the account's storage.
+///
+transaction(
+    key: String,  // key to be used for the account
+    signatureAlgorithm: UInt8, // signature algorithm to be used for the account
+    hashAlgorithm: UInt8, // hash algorithm to be used for the account
+    weight: UFix64, // weight to be used for the account
+) {
+    let auth: auth(Storage, Keys, Capabilities) &Account
+
+    prepare(signer: auth(Storage, Keys, Capabilities) &Account) {
+		pre {
+			signatureAlgorithm >= 1 && signatureAlgorithm <= 3:
+                "Cannot add Key: Must provide a signature algorithm raw value that corresponds to "
+                .concat("one of the available signature algorithms for Flow keys.")
+                .concat("You provided ").concat(signatureAlgorithm.toString())
+                .concat(" but the options are either 1 (ECDSA_P256), 2 (ECDSA_secp256k1), or 3 (BLS_BLS12_381).")
+			hashAlgorithm >= 1 && hashAlgorithm <= 6:
+                "Cannot add Key: Must provide a hash algorithm raw value that corresponds to "
+                .concat("one of of the available hash algorithms for Flow keys.")
+                .concat("You provided ").concat(hashAlgorithm.toString())
+                .concat(" but the options are 1 (SHA2_256), 2 (SHA2_384), 3 (SHA3_256), ")
+                .concat("4 (SHA3_384), 5 (KMAC128_BLS_BLS12_381), or 6 (KECCAK_256).")
+			weight <= 1000.0:
+                "Cannot add Key: The key weight must be between 0 and 1000."
+                .concat(" You provided ").concat(weight.toString()).concat(" which is invalid.")
+		}
+
+        self.auth = signer
+    }
+
+    execute {
+        // Create a new public key
+		let publicKey = PublicKey(
+			publicKey: key.decodeHex(),
+			signatureAlgorithm: SignatureAlgorithm(rawValue: signatureAlgorithm)!
+		)
+
+        // Create a new account
+		let account = Account(payer: self.auth)
+
+        // Add the public key to the account
+		account.keys.add(
+            publicKey: publicKey,
+            hashAlgorithm: HashAlgorithm(rawValue: hashAlgorithm)!,
+            weight: weight
+        )
+
+        // Create a new COA
+        let coa <- EVM.createCadenceOwnedAccount()
+
+        // Save the COA to the new account
+        let storagePath = StoragePath(identifier: "evm")!
+        let publicPath = PublicPath(identifier: "evm")!
+        account.storage.save<@EVM.CadenceOwnedAccount>(<-coa, to: storagePath)
+        let addressableCap = account.capabilities.storage.issue<&EVM.CadenceOwnedAccount>(storagePath)
+        account.capabilities.unpublish(publicPath)
+        account.capabilities.publish(addressableCap, at: publicPath)
+    }
+}