feature: stake-dao adapters and tests for DeFi-SDK integration

contracts/adapters/stake-dao/StakeDAOTokenAdapter.sol

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+// SPDX-License-Identifier: None
+
+pragma solidity 0.6.5;
+pragma experimental ABIEncoderV2;
+
+import {ERC20} from "../../ERC20.sol";
+import {TokenMetadata, Component} from "../../Structs.sol";
+import {TokenAdapter} from "../TokenAdapter.sol";
+
+interface Vault {
+    function token() external view returns (address);
+
+    function getPricePerFullShare() external view returns (uint256);
+}
+
+/**
+ * @title Token adapter for Stake DAO Vaults.
+ * @dev Implementation of TokenAdapter abstract contract.
+ * @author Elephant memory/strength
+ */
+contract StakeDaoTokenAdapter is TokenAdapter {
+    address internal constant SD_VECRV = 0x478bBC744811eE8310B461514BDc29D03739084D;
+    address internal constant CRV = 0xD533a949740bb3306d119CC777fa900bA034cd52;
+
+    /**
+     * @return TokenMetadata struct with ERC20-style token info.
+     * @dev Implementation of TokenAdapter interface function.
+     */
+    function getMetadata(address token)
+        external
+        view
+        override
+        returns (TokenMetadata memory)
+    {
+        return
+            TokenMetadata({
+                token: token,
+                name: ERC20(token).name(),
+                symbol: ERC20(token).symbol(),
+                decimals: ERC20(token).decimals()
+            });
+    }
+
+    /**
+     * @return Array of Component structs with underlying tokens rates for the given token.
+     * @dev Implementation of TokenAdapter abstract contract function.
+     */
+    function getComponents(address token)
+        external
+        view
+        override
+        returns (Component[] memory)
+    {
+        Component[] memory components = new Component[](1);
+
+        if (token == SD_VECRV) {
+            components[0] = Component({
+                token: CRV,
+                tokenType: "ERC20",
+                rate: 1e18
+            });
+        } else {
+            components[0] = Component({
+                token: Vault(token).token(),
+                tokenType: "ERC20",
+                rate: Vault(token).getPricePerFullShare()
+            });
+        }
+
+        return components;
+    }
+}

contracts/adapters/stake-dao/StakeDAOVaultAdapter.sol

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+// SPDX-License-Identifier: None
+
+pragma solidity 0.6.5;
+pragma experimental ABIEncoderV2;
+
+import {ERC20} from "../../ERC20.sol";
+import {ProtocolAdapter} from "../ProtocolAdapter.sol";
+
+/**
+ * @title Adapter for Yearn Token Vaults.
+ * @dev Implementation of ProtocolAdapter interface.
+ * @author Igor Sobolev <[email protected]>
+ */
+contract StakeDAOVaultAdapter is ProtocolAdapter {
+    string public constant override adapterType = "Asset";
+
+    string public constant override tokenType = "Stake DAO Vault";
+
+    /**
+     * @return Amount of Stake DAO Vault Tokens owned by the given account.
+     * @param token Address of the vault token.
+     * @dev Implementation of ProtocolAdapter interface function.
+     */
+    function getBalance(address token, address account)
+        external
+        view
+        override
+        returns (uint256)
+    {
+        return ERC20(token).balanceOf(account);
+    }
+}

test/adapters/StakeDaoTokenAdapter.js

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+const TokenAdapter = artifacts.require("StakeDaoTokenAdapter");
+
+contract("StakeDaoTokenAdapter", () => {
+  const sbtcVaultAddress = "0x24129B935AfF071c4f0554882C0D9573F4975fEd";
+  const sbtcCrv = "0x075b1bb99792c9E1041bA13afEf80C91a1e70fB3";
+
+  const sdveCrvAddress = "0x478bBC744811eE8310B461514BDc29D03739084D";
+  const CRV = '0xD533a949740bb3306d119CC777fa900bA034cd52';
+
+  let accounts;
+  let tokenAdapter;
+  const sbtcVault = [
+    sbtcVaultAddress,
+    "stake dao Curve.fi renBTC/wBTC/sBTC",
+    "sdcrvRenWSBTC",
+    "18",
+  ];
+
+  const sdveCrvVault = [sdveCrvAddress, "veCRV Stake DAO", "sdveCRV-DAO", "18"];
+
+  beforeEach(async () => {
+    accounts = await web3.eth.getAccounts();
+
+    await TokenAdapter.new({ from: accounts[0] }).then((result) => {
+      tokenAdapter = result.contract;
+    });
+  });
+
+  it("should return correct components for sBTC, 3Pool, Eurs vaults", async () => {
+    await tokenAdapter.methods["getComponents(address)"](sbtcVaultAddress)
+      .call()
+      .then((result) => {
+        assert.equal(result[0][0], sbtcCrv);
+        assert.equal(result[0][1], "ERC20");
+      });
+  });
+
+  it("should return correct metadata for sBTC, 3Pool, Eurs vaults", async () => {
+    await tokenAdapter.methods["getMetadata(address)"](sbtcVaultAddress)
+      .call()
+      .then((result) => {
+        assert.deepEqual(result, sbtcVault);
+      });
+  });
+
+  it("should return correct components for perpetual passive strategy vault", async () => {
+    await tokenAdapter.methods["getComponents(address)"](sdveCrvAddress)
+      .call()
+      .then((result) => {
+        assert.equal(result[0][0], CRV);
+        assert.equal(result[0][1], "ERC20");
+        assert.equal(result[0][2], "1000000000000000000");
+      });
+  });
+
+  it("should return correct metadata for perpetual passive strategy vaults", async () => {
+    await tokenAdapter.methods["getMetadata(address)"](sdveCrvAddress)
+      .call()
+      .then((result) => {
+        assert.deepEqual(result, sdveCrvVault);
+      });
+  });
+});