Refactor parameter parsing

.github/workflows/build.yml

@@ -67,7 +67,7 @@ jobs:
         mkdir -p build
         go build -v -o build/tfswitch
         mkdir `pwd`/bin/
-        find ./test-data/* -type d -print0 | while read -r -d $'\0' TEST_PATH; do
+        find ./test-data/integration-tests/* -type d -print0 | while read -r -d $'\0' TEST_PATH; do
             ./build/tfswitch -c "${TEST_PATH}" -b `pwd`/bin/terraform || exit 1
         done
 

go.mod

@@ -5,7 +5,7 @@ go 1.22
 require (
 	github.com/gookit/slog v0.5.5
 	github.com/hashicorp/go-version v1.6.0
-	github.com/hashicorp/hcl2 v0.0.0-20191002203319-fb75b3253c80
+	github.com/hashicorp/hcl/v2 v2.20.1
 	github.com/hashicorp/terraform-config-inspect v0.0.0-20231204233900-a34142ec2a72
 	github.com/manifoldco/promptui v0.9.0
 	github.com/mitchellh/go-homedir v1.1.0
@@ -16,36 +16,37 @@ require (
 )
 
 require (
-	github.com/agext/levenshtein v1.2.2 // indirect
-	github.com/apparentlymart/go-textseg v1.0.0 // indirect
-	github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e // indirect
+	github.com/agext/levenshtein v1.2.3 // indirect
+	github.com/apparentlymart/go-textseg/v15 v15.0.0 // indirect
+	github.com/chzyer/readline v1.5.1 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
-	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/gookit/color v1.5.4 // indirect
 	github.com/gookit/goutil v0.6.15 // indirect
 	github.com/gookit/gsr v0.1.0 // indirect
-	github.com/hashicorp/hcl v1.0.0 // indirect
-	github.com/hashicorp/hcl/v2 v2.0.0 // indirect
+	github.com/hashicorp/hcl v1.0.1-vault-5 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
-	github.com/mitchellh/go-wordwrap v1.0.0 // indirect
+	github.com/mitchellh/go-wordwrap v1.0.1 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
-	github.com/pelletier/go-toml/v2 v2.1.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.0 // indirect
+	github.com/rogpeppe/go-internal v1.12.0 // indirect
 	github.com/sagikazarmark/locafero v0.4.0 // indirect
 	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
 	github.com/sourcegraph/conc v0.3.0 // indirect
 	github.com/spf13/afero v1.11.0 // indirect
 	github.com/spf13/cast v1.6.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/stretchr/testify v1.9.0 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
-	github.com/zclconf/go-cty v1.1.0 // indirect
-	go.uber.org/atomic v1.9.0 // indirect
-	go.uber.org/multierr v1.9.0 // indirect
-	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
-	golang.org/x/sync v0.5.0 // indirect
+	github.com/zclconf/go-cty v1.14.4 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/exp v0.0.0-20240404231335-c0f41cb1a7a0 // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/tools v0.20.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

lib/checksum.go

@@ -33,29 +33,27 @@ func getChecksumFromHashFile(signatureFilePath string, terraformFileName string)
 
 // checkChecksumMatches This will calculate and compare the check sum of the downloaded zip file
 func checkChecksumMatches(hashFile string, targetFile *os.File) bool {
+	logger.Debugf("Checksum comparison for %q", targetFile.Name())
 	var fileHandlersToClose []*os.File
 	fileHandlersToClose = append(fileHandlersToClose, targetFile)
+	defer closeFileHandlers(fileHandlersToClose)
 
 	_, fileName := filepath.Split(targetFile.Name())
 	expectedChecksum, err := getChecksumFromHashFile(hashFile, fileName)
 	if err != nil {
-		closeFileHandlers(fileHandlersToClose)
 		logger.Errorf("Could not get checksum from file %q: %v", hashFile, err)
 		return false
 	}
 	hash := sha256.New()
 	if _, err := io.Copy(hash, targetFile); err != nil {
-		closeFileHandlers(fileHandlersToClose)
 		logger.Errorf("Checksum calculation failed for %q: %v", fileName, err)
 		return false
 	}
 	checksum := hex.EncodeToString(hash.Sum(nil))
 	if expectedChecksum != checksum {
-		closeFileHandlers(fileHandlersToClose)
 		logger.Errorf("Checksum mismatch for %q. Expected: %q, calculated: %v", fileName, expectedChecksum, checksum)
 		return false
 	}
-	closeFileHandlers(fileHandlersToClose)
 	return true
 }
 

lib/checksum_test.go

@@ -18,6 +18,7 @@ func Test_getChecksumFromHashFile(t *testing.T) {
 }
 
 func Test_checkChecksumMatches(t *testing.T) {
+	InitLogger("TRACE")
 	targetFile, err := os.Open("../test-data/checksum-check-file")
 	if err != nil {
 		t.Errorf("[Error]: Could not open testfile for signature verification.")

lib/common.go

@@ -30,16 +30,6 @@ func createFile(path string) {
 	logger.Infof("==> done creating %q file", path)
 }
 
-func createDirIfNotExist(dir string) {
-	if _, err := os.Stat(dir); os.IsNotExist(err) {
-		logger.Infof("Creating directory for terraform: %v", dir)
-		err = os.MkdirAll(dir, 0755)
-		if err != nil {
-			logger.Panic("Unable to create %q directory for terraform: %v", dir, err)
-		}
-	}
-}
-
 func cleanUp(path string) {
 	removeContents(path)
 	removeFiles(path)

lib/defaults.go

@@ -30,3 +30,13 @@ func GetDefaultBin() string {
 	}
 	return defaultBin
 }
+
+const (
+	DefaultMirror             = "https://releases.hashicorp.com/terraform"
+	DefaultLatest             = ""
+	installFile               = "terraform"
+	installPath               = ".terraform.versions"
+	recentFile                = "RECENT"
+	tfDarwinArm64StartVersion = "1.0.2"
+	VersionPrefix             = "terraform_"
+)

lib/download.go

@@ -121,7 +121,7 @@ func downloadFromURL(installLocation string, url string) (string, error) {
 
 func downloadPublicKey(installLocation string, targetFileName string) error {
 	logger.Debugf("Looking up public key file at %q", targetFileName)
-	publicKeyFileExists := FileExists(targetFileName)
+	publicKeyFileExists := FileExistsAndIsNotDir(targetFileName)
 	if !publicKeyFileExists {
 		// Public key does not exist. Let's grab it from hashicorp
 		pubKeyFile, errDl := downloadFromURL(installLocation, PubKeyUri)

lib/download_test.go

@@ -25,14 +25,14 @@ func TestDownloadFromURL_FileNameMatch(t *testing.T) {
 		logger.Fatalf("Could not detect home directory")
 	}
 
-	logger.Infof("Current home directory: %q", home)
+	t.Logf("Current home directory: %q", home)
 	var installLocation = ""
 	if runtime.GOOS != "windows" {
 		installLocation = filepath.Join(home, installPath)
 	} else {
 		installLocation = installPath
 	}
-	logger.Infof("Install Location: %v", installLocation)
+	t.Logf("install Location: %v", installLocation)
 
 	// create /.terraform.versions_test/ directory to store code
 	if _, err := os.Stat(installLocation); os.IsNotExist(err) {
@@ -74,7 +74,7 @@ func TestDownloadFromURL_FileNameMatch(t *testing.T) {
 
 	t.Cleanup(func() {
 		defer os.Remove(tempDir)
-		logger.Infof("Cleanup temporary directory %q", tempDir)
+		t.Logf("Cleanup temporary directory %q", tempDir)
 	})
 }
 

lib/files.go

@@ -4,19 +4,20 @@ import (
 	"archive/zip"
 	"bufio"
 	"bytes"
+	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 )
 
 // RenameFile : rename file name
 func RenameFile(src string, dest string) {
+	logger.Debugf("Renaming file %q to %q", src, dest)
 	err := os.Rename(src, dest)
 	if err != nil {
-		logger.Error(err)
-		return
+		logger.Fatal(err)
 	}
 }
 
@@ -46,68 +47,39 @@ func CheckFileExist(file string) bool {
 // Unzip will decompress a zip archive, moving all files and folders
 // within the zip file (parameter 1) to an output directory (parameter 2).
 func Unzip(src string, dest string) ([]string, error) {
+	logger.Debugf("Unzipping file %q", src)
 
 	var filenames []string
 
-	r, err := zip.OpenReader(src)
+	reader, err := zip.OpenReader(src)
 	if err != nil {
 		return filenames, err
 	}
-	defer r.Close()
-
-	for _, f := range r.File {
-
-		filePath, _ := filepath.Abs(f.Name)
-		rc, err := f.Open()
-		if err != nil {
-			return filenames, err
-		}
-		defer rc.Close()
-
-		// Store filename/path for returning and using later on
-		fpath := filepath.Join(dest, f.Name)
-		filenames = append(filenames, fpath)
-
-		if f.FileInfo().IsDir() {
-
-			// Make Folder
-			_ = os.MkdirAll(fpath, os.ModePerm)
-
+	defer reader.Close()
+	destination, err := filepath.Abs(dest)
+	if err != nil {
+		logger.Fatalf("Could not open destination: %v", err)
+	}
+	var wg sync.WaitGroup
+	for _, f := range reader.File {
+		wg.Add(1)
+		unzipErr := unzipFile(f, destination, &wg)
+		if unzipErr != nil {
+			logger.Fatalf("Error unzipping %v", unzipErr)
 		} else {
-			if !strings.Contains(filePath, "..") {
-				// Make File
-				if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
-					return filenames, err
-				}
-
-				outFile, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
-				if err != nil {
-					return filenames, err
-				}
-
-				_, err = io.Copy(outFile, rc)
-
-				// Close the file without defer to close before next iteration of loop
-				_ = outFile.Close()
-
-				if err != nil {
-					return filenames, err
-				}
-			}
-
+			filenames = append(filenames, filepath.Join(destination, f.Name))
 		}
 	}
 	return filenames, nil
 }
 
-// CreateDirIfNotExist : create directory if directory does not exist
-func CreateDirIfNotExist(dir string) {
+// createDirIfNotExist : create directory if directory does not exist
+func createDirIfNotExist(dir string) {
 	if _, err := os.Stat(dir); os.IsNotExist(err) {
 		logger.Infof("Creating directory for terraform binary at %q", dir)
 		err = os.MkdirAll(dir, 0755)
 		if err != nil {
-			logger.Error(err)
-			logger.Panicf("Unable to create directory for terraform binary at: %v", dir)
+			logger.Panicf("Unable to create %q directory for terraform: %v", dir, err)
 		}
 	}
 }
@@ -188,10 +160,9 @@ func CheckDirHasTGBin(dir, prefix string) bool {
 
 	exist := false
 
-	files, err := ioutil.ReadDir(dir)
+	files, err := os.ReadDir(dir)
 	if err != nil {
 		logger.Fatal(err)
-		os.Exit(1)
 	}
 	res := []string{}
 	for _, f := range files {
@@ -230,7 +201,56 @@ func GetCurrentDirectory() string {
 	dir, err := os.Getwd() //get current directory
 	if err != nil {
 		logger.Fatalf("Failed to get current directory %v", err)
-		os.Exit(1)
 	}
 	return dir
 }
+
+func unzipFile(f *zip.File, destination string, wg *sync.WaitGroup) error {
+	defer wg.Done()
+	// 1. Check if file paths are not vulnerable to Zip Slip
+	filePath := filepath.Join(destination, f.Name)
+	if !strings.HasPrefix(filePath, filepath.Clean(destination)+string(os.PathSeparator)) {
+		return fmt.Errorf("Invalid file path: %q", filePath)
+	}
+
+	// 2. Create directory tree
+	if f.FileInfo().IsDir() {
+		logger.Debugf("Extracting directory %q", filePath)
+		if err := os.MkdirAll(filePath, os.ModePerm); err != nil {
+			return err
+		}
+		return nil
+	}
+
+	if err := os.MkdirAll(filepath.Dir(filePath), os.ModePerm); err != nil {
+		return err
+	}
+
+	// 3. Create a destination file for unzipped content
+	destinationFile, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
+	defer func(destinationFile *os.File) {
+		_ = destinationFile.Close()
+	}(destinationFile)
+	if err != nil {
+		return err
+	}
+
+	// 4. Unzip the content of a file and copy it to the destination file
+	zippedFile, err := f.Open()
+	defer func(zippedFile io.ReadCloser) {
+		_ = zippedFile.Close()
+	}(zippedFile)
+	if err != nil {
+		return err
+	}
+
+	logger.Debugf("Extracting File %q", destinationFile.Name())
+	if _, err := io.Copy(destinationFile, zippedFile); err != nil {
+		return err
+	}
+	logger.Debugf("Closing destination file handler %q", destinationFile.Name())
+	_ = destinationFile.Close()
+	logger.Debugf("Closing zipped file handler %q", f.Name)
+	_ = zippedFile.Close()
+	return nil
+}