From 92de4616b2ba04fe25d409a33f862ef4663919ae Mon Sep 17 00:00:00 2001
From: Roberto Cano <3525807+robercano@users.noreply.github.com>
Date: Mon, 21 Aug 2023 11:56:20 +0200
Subject: [PATCH] feature: added dma-library wrapper for signing and ChargeFee

---
 .../actions/common/charge-fee-mocked.test.ts  |  6 +--
 packages/dma-library/src/actions/common.ts    | 54 +++++++++++++++++++
 .../src/utils/signing/sign-message.ts         | 18 +++++++
 3 files changed, 75 insertions(+), 3 deletions(-)
 create mode 100644 packages/dma-library/src/utils/signing/sign-message.ts

diff --git a/packages/dma-contracts/test/unit/actions/common/charge-fee-mocked.test.ts b/packages/dma-contracts/test/unit/actions/common/charge-fee-mocked.test.ts
index 7c515f048..1dd4fa4e8 100644
--- a/packages/dma-contracts/test/unit/actions/common/charge-fee-mocked.test.ts
+++ b/packages/dma-contracts/test/unit/actions/common/charge-fee-mocked.test.ts
@@ -4,6 +4,7 @@ import { createDeploy } from '@dma-common/utils/deploy'
 import init from '@dma-common/utils/init'
 import { calldataTypes } from '@dma-library'
 import { toSolidityPercentage } from '@dma-library/utils/percentages/percentage-utils'
+import { signSolidityCalldata } from '@dma-library/utils/signing/sign-message'
 import { SignerWithAddress } from '@nomiclabs/hardhat-ethers/signers'
 import { BigNumber, utils } from 'ethers'
 import { ethers } from 'hardhat'
@@ -47,7 +48,8 @@ describe('ChargeFee Action | Unit', () => {
     debtAssetDecimals: number,
   ) => {
     // CREATE SIGNATURE
-    const msgHash = ethers.utils.solidityKeccak256(
+    const signature = await signSolidityCalldata(
+      backendSigner,
       ['uint256', 'uint256', 'uint256', 'address', 'uint8', 'uint256', 'address', 'uint8'],
       [
         feeAmount,
@@ -61,8 +63,6 @@ describe('ChargeFee Action | Unit', () => {
       ],
     )
 
-    const signature = await backendSigner.signMessage(ethers.utils.arrayify(msgHash))
-
     // ENCODE THE CALL
     return utils.defaultAbiCoder.encode(
       [calldataTypes.common.ChargeFee],
diff --git a/packages/dma-library/src/actions/common.ts b/packages/dma-library/src/actions/common.ts
index d39c33580..e5c7c7111 100644
--- a/packages/dma-library/src/actions/common.ts
+++ b/packages/dma-library/src/actions/common.ts
@@ -1,7 +1,9 @@
 import { CONTRACT_NAMES } from '@deploy-configurations/constants'
 import { getActionHash } from '@deploy-configurations/utils/action-hash'
 import { ActionCall, calldataTypes } from '@dma-library/types'
+import { signSolidityCalldata } from '@dma-library/utils/signing/sign-message'
 import BigNumber from 'bignumber.js'
+import { Signer } from 'ethers'
 
 import { ActionFactory } from './action-factory'
 
@@ -167,3 +169,55 @@ export function positionCreated(args: {
     ],
   )
 }
+
+export async function chargeFee(args: {
+  signer: Signer
+  feeAmount: BigNumber
+  maxFeePercentage: BigNumber
+  collateralAmount: BigNumber
+  collateralAsset: string
+  collateralAssetDecimals: number
+  debtAmount: BigNumber
+  debtAsset: string
+  debtAssetDecimals: number
+}) {
+  const dataTypesWithoutSignature = [
+    'uint256',
+    'uint256',
+    'uint256',
+    'address',
+    'uint8',
+    'uint256',
+    'address',
+    'uint8',
+  ]
+
+  const signature: string = await signSolidityCalldata(args.signer, dataTypesWithoutSignature, [
+    args.feeAmount,
+    args.maxFeePercentage,
+    args.collateralAmount,
+    args.collateralAsset,
+    args.collateralAssetDecimals,
+    args.debtAmount,
+    args.debtAsset,
+    args.debtAssetDecimals,
+  ])
+
+  return createAction(
+    getActionHash(CONTRACT_NAMES.common.CHARGE_FEE),
+    [calldataTypes.common.ChargeFee],
+    [
+      {
+        feeAmount: args.feeAmount,
+        maxFeePercentage: args.maxFeePercentage,
+        collateralAmount: args.collateralAmount,
+        collateralAsset: args.collateralAsset,
+        collateralAssetDecimals: args.collateralAssetDecimals,
+        debtAmount: args.debtAmount,
+        debtAsset: args.debtAsset,
+        debtAssetDecimals: args.debtAssetDecimals,
+        signature,
+      },
+    ],
+  )
+}
diff --git a/packages/dma-library/src/utils/signing/sign-message.ts b/packages/dma-library/src/utils/signing/sign-message.ts
new file mode 100644
index 000000000..023679631
--- /dev/null
+++ b/packages/dma-library/src/utils/signing/sign-message.ts
@@ -0,0 +1,18 @@
+import type { Signer } from 'ethers'
+import { ethers } from 'ethers'
+
+/**
+ *
+ * @param signer Wallet with signing capabilities, i.e: with a private key
+ * @param calldataTypes Types of the calldata to be signed in solidity format
+ * @param calldataValues Values of the calldata to be signed
+ * @returns Signature of the calldata
+ */
+export async function signSolidityCalldata(
+  signer: Signer,
+  calldataTypes: string[],
+  calldataValues: any[],
+): Promise<string> {
+  const msgHash = ethers.utils.solidityKeccak256(calldataTypes, calldataValues)
+  return await signer.signMessage(ethers.utils.arrayify(msgHash))
+}