✨ DSAuth + DSRoles

.dapprc

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+# Basic build/test configuration.
+export DAPP_SOLC_VERSION=0.8.6
+export DAPP_BUILD_OPTIMIZE=1
+export DAPP_BUILD_OPTIMIZE_RUNS=1000000000
+export DAPP_LINK_TEST_LIBRARIES=0

.gitattributes

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+*.sol linguist-language=Solidity
+.dapprc linguist-language=Shell

.github/workflows/tests.yml

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+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+      - uses: cachix/install-nix-action@v13
+      - uses: cachix/cachix-action@v10
+        with:
+          name: dapp
+
+      - name: Install dependencies
+        run: nix-shell --run 'make'
+
+      - name: Run tests
+        run: nix-shell --run 'dapp test'

.gitignore

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+/out
+/node_modules

.vscode/settings.json

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+{
+  "solidity.packageDefaultDependenciesContractsDirectory": "src",
+  "solidity.packageDefaultDependenciesDirectory": "lib",
+  "solidity.compileUsingRemoteVersion": "v0.8.6",
+  "files.associations": {
+    ".dapprc": "shellscript"
+  }
+}

Makefile

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+# Install, update, build and test everything.
+all: solc install update
+# Install proper solc version.
+solc:; nix-env -f https://github.com/dapphub/dapptools/archive/master.tar.gz -iA solc-static-versions.solc_0_8_6
+# Install npm dependencies.
+install:; npm install
+# Install dapp dependencies.
+update:; dapp update

package.json

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+{
+  "name": "@rari-capital/dappsys",
+  "version": "1.0.0",
+  "description": "Rari Capital's modern fork of some key Dappsys contracts.",
+  "files": [
+    "src/**/*.sol"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/Rari-Capital/dappsys.git"
+  },
+  "devDependencies": {
+    "prettier": "^2.3.1",
+    "prettier-plugin-solidity": "^1.0.0-beta.13"
+  }
+}

src/DSAuth.sol

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+// SPDX-License-Identifier: GPL-3.0-only
+pragma solidity >=0.4.23;
+
+import "./DSAuthority.sol";
+
+/// @notice Provides a flexible and updatable auth pattern which is completely separate from application logic.
+abstract contract DSAuth {
+  event LogSetAuthority(address indexed authority);
+  event LogSetOwner(address indexed owner);
+
+  DSAuthority public authority;
+  address public owner;
+
+  constructor() {
+    owner = msg.sender;
+    emit LogSetOwner(msg.sender);
+  }
+
+  function setOwner(address owner_) external auth {
+    owner = owner_;
+    emit LogSetOwner(owner);
+  }
+
+  function setAuthority(DSAuthority authority_) external auth {
+    authority = authority_;
+    emit LogSetAuthority(address(authority));
+  }
+
+  modifier auth() {
+    require(isAuthorized(msg.sender, msg.sig), "ds-auth-unauthorized");
+    _;
+  }
+
+  function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
+    if (src == address(this)) {
+      return true;
+    } else if (src == owner) {
+      return true;
+    } else if (authority == DSAuthority(address(0))) {
+      return false;
+    } else {
+      return authority.canCall(src, address(this), sig);
+    }
+  }
+}

src/DSAuthority.sol

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+// SPDX-License-Identifier: GPL-3.0-only
+pragma solidity >=0.4.23;
+
+/// @notice A generic interface for a contract which provides authorization data to a DSAuth instance.
+interface DSAuthority {
+  function canCall(
+    address src,
+    address dst,
+    bytes4 sig
+  ) external view returns (bool);
+}