✨ Porting the shellscript to go

Porting the shellscript to go

Signed-off-by: naveen <172697+naveensrinivasan@users.noreply.github.com>

.github/workflows/tests.yaml

@@ -0,0 +1,42 @@
+name: CI-Tests
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+permissions: read-all
+
+jobs:
+  unit-tests:
+    name: Run unit tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest ]
+
+    steps:
+      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579 #v2.4.0
+      # https://github.com/mvdan/github-actions-golang#how-do-i-set-up-caching-between-builds
+      - uses: actions/cache@937d24475381cd9c75ae6db12cb4e79714b926ed #v2.1.7
+        with:
+          # In order:
+          # * Module download cache
+          # * Build cache (Linux)
+          # * Build cache (Mac)
+          # * Build cache (Windows)
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+            ~/Library/Caches/go-build
+            %LocalAppData%\go-build
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+      - uses: actions/setup-go@424fc82d43fa5a37540bae62709ddcc23d9520d4 #v2.1.5
+        with:
+          go-version: '1.17.x'
+      - name: Run Go tests
+        run: go test ./...
+      - name: Run Go tests w/ `-race`
+        run: go test -race ./...

go.mod

@@ -0,0 +1,3 @@
+module github.com/ossf/scorecard-action
+
+go 1.17

main.go

@@ -0,0 +1,157 @@
+// Copyright 2022 Security Scorecard Authors
+//
+// 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.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+)
+
+// main is the entrypoint for the action.
+func main() {
+	// TODO - This is a port of the entrypoint.sh script.
+	// This is still a work in progress.
+	if err := initalizeENVVariables(); err != nil {
+		panic(err)
+	}
+}
+
+// initalizeENVVariables is a function to initialize the environment variables required for the action.
+//nolint
+func initalizeENVVariables() error {
+	/*
+	 https://docs.github.com/en/actions/learn-github-actions/environment-variables
+	   GITHUB_EVENT_PATH contains the json file for the event.
+	   GITHUB_SHA contains the commit hash.
+	   GITHUB_WORKSPACE contains the repo folder.
+	   GITHUB_EVENT_NAME contains the event name.
+	   GITHUB_ACTIONS is true in GitHub env.
+	*/
+	if err := os.Setenv("ENABLE_SARIF", "1"); err != nil {
+		return err
+	}
+
+	if err := os.Setenv("ENABLE_LICENSE", "1"); err != nil {
+		return err
+	}
+
+	if err := os.Setenv("ENABLE_DANGEROUS_WORKFLOW", "1"); err != nil {
+		return err
+	}
+
+	if err := os.Setenv("SCORECARD_POLICY_FILE", "/policy.yml"); err != nil {
+		return err
+	}
+
+	if result, exists := os.LookupEnv("INPUT_RESULTS_FILE"); !exists {
+		return fmt.Errorf("INPUT_RESULTS_FILE is not set")
+	} else {
+		if result == "" {
+			return fmt.Errorf("INPUT_RESULTS_FILE is empty")
+		}
+		if err := os.Setenv("SCORECARD_RESULTS_FILE", result); err != nil {
+			return err
+		}
+	}
+
+	if result, exists := os.LookupEnv("INPUT_RESULTS_FORMAT"); !exists {
+		return fmt.Errorf("INPUT_RESULTS_FORMAT is not set")
+	} else {
+		if result == "" {
+			return fmt.Errorf("INPUT_RESULTS_FORMAT is empty")
+		}
+		if err := os.Setenv("SCORECARD_RESULTS_FORMAT", result); err != nil {
+			return err
+		}
+	}
+
+	if result, exists := os.LookupEnv("INPUT_PUBLISH_RESULTS"); !exists {
+		return fmt.Errorf("INPUT_PUBLISH_RESULTS is not set")
+	} else {
+		if result == "" {
+			return fmt.Errorf("INPUT_PUBLISH_RESULTS is empty")
+		}
+		if err := os.Setenv("SCORECARD_PUBLISH_RESULTS", result); err != nil {
+			return err
+		}
+	}
+
+	if err := os.Setenv("SCORECARD_BIN", "/scorecard"); err != nil {
+		return err
+	}
+
+	if err := os.Setenv("ENABLED_CHECKS", ""); err != nil {
+		return err
+	}
+	return gitHubEventPath()
+}
+
+// gitHubEventPath is a function to get the path to the GitHub event
+// and sets the SCORECARD_IS_FORK environment variable.
+func gitHubEventPath() error {
+	if result, exists := os.LookupEnv("GITHUB_EVENT_PATH"); !exists {
+		return fmt.Errorf("GITHUB_EVENT_PATH is not set")
+	} else {
+		if result == "" {
+			return fmt.Errorf("GITHUB_EVENT_PATH is empty")
+		}
+		if err := os.Setenv("GITHUB_EVENT_PATH", result); err != nil {
+			return err
+		}
+
+		data, err := ioutil.ReadFile(result)
+		if err != nil {
+			return err
+		}
+
+		if isFork, err := scorecardIsFork(string(data)); err != nil {
+			return err
+		} else {
+			if isFork {
+				if err := os.Setenv("SCORECARD_IS_FORK", "true"); err != nil {
+					return err
+				}
+			} else {
+				if err := os.Setenv("SCORECARD_IS_FORK", "false"); err != nil {
+					return err
+				}
+			}
+		}
+	}
+	return nil
+}
+
+// scorecardIsFork is a function to check if the current repo is a fork.
+func scorecardIsFork(ghEventPath string) (bool, error) {
+	if ghEventPath == "" {
+		return false, fmt.Errorf("ghEventPath is empty")
+	}
+	/*
+	 https://docs.github.com/en/actions/reference/workflow-commands-for-github-actions#github_repository_is_fork
+	   GITHUB_REPOSITORY_IS_FORK is true if the repository is a fork.
+	*/
+	type repo struct {
+		Repository struct {
+			Fork bool `json:"fork"`
+		} `json:"repository"`
+	}
+	var r repo
+	if err := json.Unmarshal([]byte(ghEventPath), &r); err != nil {
+		return false, err
+	}
+
+	return r.Repository.Fork, nil
+}