Add Account framework (#5657)

contracts/utils/cryptography/SignerECDSA.sol

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.20;
+
+import {ECDSA} from "../cryptography/ECDSA.sol";
+import {AbstractSigner} from "./AbstractSigner.sol";
+
+/**
+ * @dev Implementation of {AbstractSigner} using xref:api:utils#ECDSA[ECDSA] signatures.
+ *
+ * For {Account} usage, a {_setSigner} function is provided to set the {signer} address.
+ * Doing so is easier for a factory, who is likely to use initializable clones of this contract.
+ *
+ * Example of usage:
+ *
+ * ```solidity
+ * contract MyAccountECDSA is Account, SignerECDSA, Initializable {
+ *     function initialize(address signerAddr) public initializer {
+ *       _setSigner(signerAddr);
+ *     }
+ * }
+ * ```
+ *
+ * IMPORTANT: Failing to call {_setSigner} either during construction (if used standalone)
+ * or during initialization (if used as a clone) may leave the signer either front-runnable or unusable.
+ */
+abstract contract SignerECDSA is AbstractSigner {
+    address private _signer;
+
+    /**
+     * @dev Sets the signer with the address of the native signer. This function should be called during construction
+     * or through an initializer.
+     */
+    function _setSigner(address signerAddr) internal {
+        _signer = signerAddr;
+    }
+
+    /// @dev Return the signer's address.
+    function signer() public view virtual returns (address) {
+        return _signer;
+    }
+
+    /// @inheritdoc AbstractSigner
+    function _rawSignatureValidation(
+        bytes32 hash,
+        bytes calldata signature
+    ) internal view virtual override returns (bool) {
+        (address recovered, ECDSA.RecoverError err, ) = ECDSA.tryRecover(hash, signature);
+        return signer() == recovered && err == ECDSA.RecoverError.NoError;
+    }
+}