Modernize development environment (#442)

## Summary
This PR aims to modernize the development environment in the repository
by
1. replacing Truffle with
[Hardhat](https://github.com/NomicFoundation/hardhat) and
[Foundry](https://github.com/foundry-rs/foundry)
2. updating the CI pipelines to be faster and more comprehensive
3. removing unused code

.env.example

@@ -0,0 +1,81 @@
+# Copyright 2024 Circle Internet Financial, LTD. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+##############################
+# Private Key Configurations #
+##############################=
+# The key to a pre-funded deployer address
+DEPLOYER_PRIVATE_KEY=
+
+############################
+# FiatToken Configurations #
+############################
+# The ERC20 name of the FiatToken.
+TOKEN_NAME=USDC
+
+# The ERC20 symbol of the FiatToken.
+TOKEN_SYMBOL=USDC
+
+# The fiat currency that that FiatToken represents.
+TOKEN_CURRENCY=USD
+
+# The ERC20 decimals for the FiatToken.
+TOKEN_DECIMALS=6
+
+# [OPTIONAL] The address to a deployed FiatTokenProxy contract.
+# FIAT_TOKEN_PROXY_ADDRESS=
+
+# [OPTIONAL] The address to a deployed FiatToken implementation contract.
+# FIAT_TOKEN_IMPLEMENTATION_ADDRESS=
+
+# The address of the FiatTokenProxy's admin.
+PROXY_ADMIN_ADDRESS=
+
+# The address of the FiatToken's owner.
+OWNER_ADDRESS=
+
+# The address of the MasterMinter's owner.
+MASTER_MINTER_OWNER_ADDRESS=
+
+# [OPTIONAL] The address of the FiatToken's pauser. Defaults to the owner address.
+# PAUSER_ADDRESS=
+
+# [OPTIONAL] The address of the FiatToken's blacklister. Defaults to the owner address.
+# BLACKLISTER_ADDRESS=
+
+# [OPTIONAL] The address to which locked funds are sent to. Only applicable for version 2 -> 2.1 upgrades. Defaults to the owner address.
+# LOST_AND_FOUND_ADDRESS=
+
+##########################
+# Network Configurations #
+##########################
+# [OPTIONAL] The URL to a mainnet JSON-RPC node.
+# MAINNET_RPC_URL=
+
+# [OPTIONAL] The URL to a testnet JSON-RPC node.
+# TESTNET_RPC_URL=
+
+# The percentage to multiply gas usage estimations by (eg. 200 to double the estimation). Defaults to 130.
+GAS_MULTIPLIER=110
+
+################################
+# Miscellaneous Configurations #
+################################
+# The file name from which to read the list of addresses to blacklist
+BLACKLIST_FILE_NAME=blacklist.remote.json
+
+# [OPTIONAL] The API key to an Etherscan flavor block explorer.
+# ETHERSCAN_KEY=

.eslintignore

@@ -1,4 +1,16 @@
-.DS_Store
+.idea/
+**/.DS_Store
+
+artifacts/
+cache/
+@types/generated/
+
 node_modules/
+yarn-error.log
+
 coverage/
-@types/generated/
+coverage.json
+
+blacklist.*.json
+
+LICENSE

.eslintrc.js

@@ -1,13 +1,13 @@
 /**
- * SPDX-License-Identifier: Apache-2.0
+ * Copyright 2023 Circle Internet Financial, LTD. All rights reserved.
  *
- * Copyright (c) 2023, Circle Internet Financial, LLC.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
- * http://www.apache.org/licenses/LICENSE-2.0
+ *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,

.github/composite-actions/setup-ci/action.yml

@@ -0,0 +1,52 @@
+# Copyright 2024 Circle Internet Financial, LTD. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Setup CI
+runs:
+  using: composite
+  steps:
+    - name: Install Node
+      uses: actions/setup-node@v3
+      with:
+        node-version: "16.14.0"
+
+    - name: Install Foundry
+      uses: foundry-rs/foundry-toolchain@v1
+
+    - name: Update submodules
+      run: git submodule update --init --recursive
+      shell: bash
+
+    - name: Install Yarn
+      run: npm install -g yarn@1.22.19
+      shell: bash
+
+    - name: Get Yarn cache directory path
+      id: yarn-cache-dir-path
+      run: echo "dir=$(yarn cache dir)" >> $GITHUB_OUTPUT
+      shell: bash
+
+    - name: Retrieve cache
+      uses: actions/cache@v3
+      with:
+        path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+        key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-yarn-
+
+    - name: Install packages & Setup repository
+      run: yarn install --frozen-lockfile
+      shell: bash

.github/resources/coverage-report-template.md

@@ -0,0 +1,33 @@
+<!--
+ Copyright 2024 Circle Internet Financial, LTD. All rights reserved.
+
+ SPDX-License-Identifier: Apache-2.0
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+
+## Coverage Report
+
+Commit: [{{short_commit_sha}}]({{commit_link}})
+
+| Type                      | Coverage                              |
+| ------------------------- | ------------------------------------- |
+| Total Statements Coverage | {{total_statements_coverage_percent}} |
+| Total Branches Coverage   | {{total_branches_coverage_percent}}   |
+| Total Functions Coverage  | {{total_functions_coverage_percent}}  |
+| Total Lines Coverage      | {{total_lines_coverage_percent}}      |
+
+<details>
+<summary>Details </summary>
+{{files_coverage_table}}
+</details>

.github/workflows/ci.yml

@@ -1,4 +1,20 @@
-name: Continuous Integration
+# Copyright 2024 Circle Internet Financial, LTD. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: CI
 on:
   push:
     branches: [master]
@@ -11,35 +27,80 @@ jobs:
       - name: Check out repository code
         uses: actions/checkout@v3
 
-      - name: Install Node
-        uses: actions/setup-node@v3
-        with:
-          node-version: "16.14.0"
-
-      - name: Install Yarn
-        run: npm install -g yarn@1.22.19
+      - name: Setup CI Environment
+        uses: ./.github/composite-actions/setup-ci
 
-      - name: Install packages
-        run: yarn install --frozen-lockfile
-
-      - name: Setup local environment
-        run: cp config.js.example config.js && ./start-ganache.sh
+      - name: Compile contracts
+        run: yarn compile
 
       - name: Run static checks
         run: yarn static-check
 
       - name: Run size check
         run: yarn contract-size
 
-      - name: Run tests
-        run: yarn test
+      - name: Run forge tests
+        run: forge test -vvv
+
+      - name: Generate gas report
+        run: yarn gas-report
+        env:
+          ENABLE_GAS_REPORTER: true
+
+  run_hardhat_tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        test-groups:
+          - grep: "FiatTokenV1:.*"
+          - grep: "FiatTokenV1_1:.*"
+          - grep: "FiatTokenV2:.*"
+          - grep: "FiatTokenV2_1:.*"
+          - grep: "FiatTokenV2_2:.*"
+          - grep: "FiatTokenV1:.*|FiatTokenV1_1:.*|FiatTokenV2:.*|FiatTokenV2_1:.*|FiatTokenV2_2:.*|gas costs"
+            invert: true
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v3
+
+      - name: Setup CI Environment
+        uses: ./.github/composite-actions/setup-ci
+
+      - name: Run hardhat tests
+        run: HARDHAT_TEST_GREP='${{ matrix.test-groups.grep }}' HARDHAT_TEST_INVERT='${{ matrix.test-groups.invert }}' yarn test
+
+      - name: Upload test results to artifacts
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: junit-report-${{ hashFiles('report/junit.xml') }}
+          path: report/junit.xml
+
+  post_run_hardhat_tests:
+    runs-on: ubuntu-latest
+    needs: [run_hardhat_tests]
+    if: always()
+    steps:
+      - name: Download test results
+        uses: actions/download-artifact@v4
+        with:
+          pattern: junit-report-*
+
+      - name: Publish combined test report
+        uses: mikepenz/action-junit-report@v4
+        with:
+          check_name: upload_test_results
+          job_summary: true
+          detailed_summary: true
+          report_paths: "./junit-report-*/junit.xml"
 
   scan:
-    needs: run_ci_tests
     if: github.event_name == 'pull_request'
-    uses: circlefin/circle-public-github-workflows/.github/workflows/pr-scan.yaml@v1
+    uses: circlefin/circle-public-github-workflows/.github/workflows/pr-scan.yaml@v1.2.0
+    with:
+      allow-reciprocal-licenses: false
 
   release-sbom:
-    needs: run_ci_tests
     if: github.event_name == 'push'
     uses: circlefin/circle-public-github-workflows/.github/workflows/attach-release-assets.yaml@v1

.github/workflows/coverage.yml

@@ -0,0 +1,60 @@
+# Copyright 2024 Circle Internet Financial, LTD. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Coverage
+on:
+  pull_request:
+    types: [labeled]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  run_coverage:
+    runs-on: ubuntu-latest
+    if: ${{ github.event.label.name == 'needs_coverage' }}
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v3
+
+      - name: Setup CI Environment
+        uses: ./.github/composite-actions/setup-ci
+
+      - name: Compile contracts
+        run: yarn compile
+
+      - name: Run coverage
+        run: yarn coverage
+
+      - name: Report coverage to PR
+        id: report-coverage
+        uses: sidx1024/report-nyc-coverage-github-action@v1.2.7
+        with:
+          coverage_file: "coverage/coverage-summary.json"
+          base_coverage_file: ""
+          comment_template_file: ".github/resources/coverage-report-template.md"
+
+      - name: Check coverage
+        if: |
+          fromJSON(steps.report-coverage.outputs.total_lines_coverage_percent_raw) < 100 ||
+          fromJSON(steps.report-coverage.outputs.total_branches_coverage_percent_raw) < 98 ||
+          fromJSON(steps.report-coverage.outputs.total_statements_coverage_percent_raw) < 100 ||
+          fromJSON(steps.report-coverage.outputs.total_functions_coverage_percent_raw) < 100
+        uses: actions/github-script@v7
+        with:
+          script: |
+            core.setFailed('Test coverage is under the threshold')