new: DefiDollar readonly adapters

contracts/adapters/defidollar/DefiDollarProtocolAdapter.sol

@@ -0,0 +1,40 @@
+// Copyright (C) 2020 Zerion Inc. <https://zerion.io>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+pragma solidity 0.6.5;
+pragma experimental ABIEncoderV2;
+
+import { ERC20 } from "../../ERC20.sol";
+import { ProtocolAdapter } from "../ProtocolAdapter.sol";
+
+/**
+ * @title Adapter for DefiDollar protocol.
+ * @dev Implementation of ProtocolAdapter interface.
+ * @author Manthankumar Satani <[email protected]>
+ */
+contract DefiDollarProtocolAdapter is ProtocolAdapter {
+    string public constant override adapterType = "Asset";
+
+    string public constant override tokenType = "ERC20";
+
+    /**
+     * @return Amount of DefiDollar tokens held by the given account.
+     * @param token Address of the DefiDollar Protocol tokens.
+     * @dev Implementation of ProtocolAdapter interface function.
+     */
+    function getBalance(address token, address account) external view override returns (uint256) {
+        return ERC20(token).balanceOf(account);
+    }
+}

contracts/adapters/defidollar/DefiDollarTokenAdapter.sol

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+// Copyright (C) 2020 Zerion Inc. <https://zerion.io>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+pragma solidity 0.6.5;
+pragma experimental ABIEncoderV2;
+
+import { ERC20 } from "../../ERC20.sol";
+import { TokenMetadata, Component } from "../../Structs.sol";
+import { TokenAdapter } from "../TokenAdapter.sol";
+
+/**
+ * @title Token adapter for DefiDollar protocol.
+ * @dev Implementation of TokenAdapter interface.
+ * @author Manthankumar Satani <[email protected]>
+ */
+contract DefiDollarTokenAdapter is TokenAdapter {
+    /**
+     * @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 interface function.
+     */
+    function getComponents(address token) external view override returns (Component[] memory) {
+        Component[] memory underlyingTokens = new Component[](1);
+
+        underlyingTokens[0] = Component({ token: token, tokenType: "ERC20", rate: uint256(1e18) });
+
+        return underlyingTokens;
+    }
+}

test/DefiDollarTokenAdapter.js

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+const TokenAdapter = artifacts.require('DefiDollarTokenAdapter');
+
+contract('DefiDollarTokenAdapter', () => {
+  const tokenAddress = '0x5bc25f649fc4e26069ddf4cf4010f9f706c23831';
+
+  let accounts;
+  let tokenAdapter;
+  const DUSD = [tokenAddress, 'DefiDollar', 'DUSD', '18'];
+
+  beforeEach(async () => {
+    accounts = await web3.eth.getAccounts();
+
+    await TokenAdapter.new({ from: accounts[0] }).then((result) => {
+      tokenAdapter = result.contract;
+    });
+  });
+
+  it('should return correct components', async () => {
+    await tokenAdapter.methods['getComponents(address)'](tokenAddress)
+      .call()
+      .then((result) => {
+        console.dir(result, { depth: null });
+      });
+  });
+
+  it('should return correct metadata', async () => {
+    await tokenAdapter.methods['getMetadata(address)'](tokenAddress)
+      .call()
+      .then((result) => {
+        assert.deepEqual(result, DUSD);
+      });
+  });
+});