feat: support for direct key-value pair writing in WritePipelineEnv

cmd/readPipelineEnv.go

@@ -1,18 +1,13 @@
 package cmd
 
 import (
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/rand"
-	"crypto/sha256"
-	"encoding/base64"
 	"encoding/json"
 	"fmt"
-	"io"
 	"os"
 	"path"
 
 	"github.com/SAP/jenkins-library/pkg/config"
+	"github.com/SAP/jenkins-library/pkg/encryption"
 	"github.com/SAP/jenkins-library/pkg/log"
 	"github.com/SAP/jenkins-library/pkg/piperenv"
 	"github.com/spf13/cobra"
@@ -69,7 +64,7 @@ func runReadPipelineEnv(stepConfigPassword string, encryptedCPE bool) error {
 		}
 
 		cpeJsonBytes, _ := json.Marshal(cpe)
-		encryptedCPEBytes, err := encrypt([]byte(stepConfigPassword), cpeJsonBytes)
+		encryptedCPEBytes, err := encryption.Encrypt([]byte(stepConfigPassword), cpeJsonBytes)
 		if err != nil {
 			log.Entry().Fatal(err)
 		}
@@ -87,28 +82,3 @@ func runReadPipelineEnv(stepConfigPassword string, encryptedCPE bool) error {
 
 	return nil
 }
-
-func encrypt(secret, inBytes []byte) ([]byte, error) {
-	// use SHA256 as key
-	key := sha256.Sum256(secret)
-	block, err := aes.NewCipher(key[:])
-	if err != nil {
-		return nil, fmt.Errorf("failed to create new cipher: %v", err)
-	}
-
-	// Make the cipher text a byte array of size BlockSize + the length of the message
-	cipherText := make([]byte, aes.BlockSize+len(inBytes))
-
-	// iv is the ciphertext up to the blocksize (16)
-	iv := cipherText[:aes.BlockSize]
-	if _, err = io.ReadFull(rand.Reader, iv); err != nil {
-		return nil, fmt.Errorf("failed to init iv: %v", err)
-	}
-
-	// Encrypt the data:
-	stream := cipher.NewCFBEncrypter(block, iv)
-	stream.XORKeyStream(cipherText[aes.BlockSize:], inBytes)
-
-	// Return string encoded in base64
-	return []byte(base64.StdEncoding.EncodeToString(cipherText)), err
-}

cmd/readPipelineEnv_test.go

@@ -4,18 +4,19 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/SAP/jenkins-library/pkg/encryption"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestCpeEncryption(t *testing.T) {
 	secret := []byte("testKey!")
 	payload := []byte(strings.Repeat("testString", 100))
 
-	encrypted, err := encrypt(secret, payload)
+	encrypted, err := encryption.Encrypt(secret, payload)
 	assert.NoError(t, err)
 	assert.NotNil(t, encrypted)
 
-	decrypted, err := decrypt(secret, encrypted)
+	decrypted, err := encryption.Decrypt(secret, encrypted)
 	assert.NoError(t, err)
 	assert.Equal(t, decrypted, payload)
 }

cmd/writePipelineEnv.go

@@ -2,27 +2,28 @@ package cmd
 
 import (
 	"bytes"
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/sha256"
-	b64 "encoding/base64"
 	"encoding/json"
 	"fmt"
 	"io"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/SAP/jenkins-library/pkg/config"
-
+	"github.com/SAP/jenkins-library/pkg/encryption"
 	"github.com/SAP/jenkins-library/pkg/log"
 	"github.com/SAP/jenkins-library/pkg/piperenv"
 	"github.com/spf13/cobra"
 )
 
 // WritePipelineEnv Serializes the commonPipelineEnvironment JSON to disk
+// Can be used in two modes:
+// 1. JSON serialization: processes JSON input from stdin or PIPER_pipelineEnv environment variable
+// 2. Direct value: writes a single key-value pair using the --value flag (format: key=value)
 func WritePipelineEnv() *cobra.Command {
 	var stepConfig artifactPrepareVersionOptions
 	var encryptedCPE bool
+	var directValue string
 	metadata := artifactPrepareVersionMetadata()
 
 	writePipelineEnv := &cobra.Command{
@@ -43,6 +44,13 @@ func WritePipelineEnv() *cobra.Command {
 		},
 
 		Run: func(cmd *cobra.Command, args []string) {
+			if directValue != "" {
+				err := writeDirectValue(directValue)
+				if err != nil {
+					log.Entry().Fatalf("error when writing direct value: %v", err)
+				}
+				return
+			}
 			err := runWritePipelineEnv(stepConfig.Password, encryptedCPE)
 			if err != nil {
 				log.Entry().Fatalf("error when writing common Pipeline environment: %v", err)
@@ -51,85 +59,94 @@ func WritePipelineEnv() *cobra.Command {
 	}
 
 	writePipelineEnv.Flags().BoolVar(&encryptedCPE, "encryptedCPE", false, "Bool to use encryption in CPE")
+	writePipelineEnv.Flags().StringVar(&directValue, "value", "", "Key-value pair to write directly (format: key=value)")
 	return writePipelineEnv
 }
 
 func runWritePipelineEnv(stepConfigPassword string, encryptedCPE bool) error {
-	var err error
-	pipelineEnv, ok := os.LookupEnv("PIPER_pipelineEnv")
-	inBytes := []byte(pipelineEnv)
-	if !ok {
-		var err error
-		inBytes, err = io.ReadAll(os.Stdin)
-		if err != nil {
-			return err
-		}
+	inBytes, err := readInput()
+	if err != nil {
+		return fmt.Errorf("failed to read input: %w", err)
 	}
 	if len(inBytes) == 0 {
 		return nil
 	}
 
-	// try to decrypt
 	if encryptedCPE {
-		log.Entry().Debug("trying to decrypt CPE")
-		if stepConfigPassword == "" {
-			return fmt.Errorf("empty stepConfigPassword")
-		}
-
-		inBytes, err = decrypt([]byte(stepConfigPassword), inBytes)
-		if err != nil {
-			log.Entry().Fatal(err)
+		if inBytes, err = handleEncryption(stepConfigPassword, inBytes); err != nil {
+			return err
 		}
 	}
 
-	commonPipelineEnv := piperenv.CPEMap{}
-	decoder := json.NewDecoder(bytes.NewReader(inBytes))
-	decoder.UseNumber()
-	err = decoder.Decode(&commonPipelineEnv)
+	commonPipelineEnv, err := parseInput(inBytes)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to parse input: %w", err)
 	}
 
-	rootPath := filepath.Join(GeneralConfig.EnvRootPath, "commonPipelineEnvironment")
-	err = commonPipelineEnv.WriteToDisk(rootPath)
-	if err != nil {
-		return err
+	if _, err := writeOutput(commonPipelineEnv); err != nil {
+		return fmt.Errorf("failed to write output: %w", err)
 	}
 
-	writtenBytes, err := json.MarshalIndent(commonPipelineEnv, "", "\t")
-	if err != nil {
-		return err
+	return nil
+}
+
+func readInput() ([]byte, error) {
+	if pipelineEnv, ok := os.LookupEnv("PIPER_pipelineEnv"); ok {
+		return []byte(pipelineEnv), nil
 	}
-	_, err = os.Stdout.Write(writtenBytes)
-	if err != nil {
-		return err
+	return io.ReadAll(os.Stdin)
+}
+
+func handleEncryption(password string, data []byte) ([]byte, error) {
+	if password == "" {
+		return nil, fmt.Errorf("encryption enabled but password is empty")
 	}
-	return nil
+	log.Entry().Debug("decrypting CPE data")
+	return encryption.Decrypt([]byte(password), data)
 }
 
-func decrypt(secret, base64CipherText []byte) ([]byte, error) {
-	// decode from base64
-	cipherText, err := b64.StdEncoding.DecodeString(string(base64CipherText))
-	if err != nil {
-		return nil, fmt.Errorf("failed to decode from base64: %v", err)
+func parseInput(data []byte) (piperenv.CPEMap, error) {
+	commonPipelineEnv := piperenv.CPEMap{}
+	decoder := json.NewDecoder(bytes.NewReader(data))
+	decoder.UseNumber()
+	if err := decoder.Decode(&commonPipelineEnv); err != nil {
+		return nil, err
 	}
+	return commonPipelineEnv, nil
+}
 
-	// use SHA256 as key
-	key := sha256.Sum256(secret)
-	block, err := aes.NewCipher(key[:])
+func writeOutput(commonPipelineEnv piperenv.CPEMap) (int, error) {
+	rootPath := filepath.Join(GeneralConfig.EnvRootPath, "commonPipelineEnvironment")
+	if err := commonPipelineEnv.WriteToDisk(rootPath); err != nil {
+		return 0, err
+	}
+
+	writtenBytes, err := json.MarshalIndent(commonPipelineEnv, "", "\t")
 	if err != nil {
-		return nil, fmt.Errorf("failed to create new cipher: %v", err)
+		return 0, err
 	}
+	return os.Stdout.Write(writtenBytes)
+}
 
-	if len(cipherText) < aes.BlockSize {
-		return nil, fmt.Errorf("invalid ciphertext block size")
+// writeDirectValue writes a single value to a file in the commonPipelineEnvironment directory
+// The key-value pair should be in the format "key=value"
+// The key will be used as the file name and the value as its content
+func writeDirectValue(keyValue string) error {
+	parts := strings.SplitN(keyValue, "=", 2)
+	if len(parts) != 2 {
+		return fmt.Errorf("invalid key-value format. Expected 'key=value', got '%s'", keyValue)
 	}
 
-	iv := cipherText[:aes.BlockSize]
-	cipherText = cipherText[aes.BlockSize:]
+	key := parts[0]
+	value := parts[1]
+
+	rootPath := filepath.Join(GeneralConfig.EnvRootPath, "commonPipelineEnvironment")
+	filePath := filepath.Join(rootPath, key)
 
-	stream := cipher.NewCFBDecrypter(block, iv)
-	stream.XORKeyStream(cipherText, cipherText)
+	// Ensure directory exists
+	if err := os.MkdirAll(filepath.Dir(filePath), 0755); err != nil {
+		return fmt.Errorf("failed to create directory: %v", err)
+	}
 
-	return cipherText, nil
+	return os.WriteFile(filePath, []byte(value), 0644)
 }

pkg/encryption/encryption.go

@@ -0,0 +1,57 @@
+package encryption
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"io"
+)
+
+// Decrypt decrypts base64-encoded data using AES-CFB
+func Decrypt(secret, base64CipherText []byte) ([]byte, error) {
+	cipherText, err := base64.StdEncoding.DecodeString(string(base64CipherText))
+	if err != nil {
+		return nil, fmt.Errorf("failed to decode from base64: %w", err)
+	}
+
+	key := sha256.Sum256(secret)
+	block, err := aes.NewCipher(key[:])
+	if err != nil {
+		return nil, fmt.Errorf("failed to create cipher: %w", err)
+	}
+
+	if len(cipherText) < aes.BlockSize {
+		return nil, fmt.Errorf("invalid ciphertext: block size too small")
+	}
+
+	iv := cipherText[:aes.BlockSize]
+	cipherText = cipherText[aes.BlockSize:]
+
+	stream := cipher.NewCFBDecrypter(block, iv)
+	stream.XORKeyStream(cipherText, cipherText)
+
+	return cipherText, nil
+}
+
+// Encrypt encrypts data using AES-CFB and encodes it in base64
+func Encrypt(secret, inBytes []byte) ([]byte, error) {
+	key := sha256.Sum256(secret)
+	block, err := aes.NewCipher(key[:])
+	if err != nil {
+		return nil, fmt.Errorf("failed to create cipher: %w", err)
+	}
+
+	cipherText := make([]byte, aes.BlockSize+len(inBytes))
+	iv := cipherText[:aes.BlockSize]
+	if _, err = io.ReadFull(rand.Reader, iv); err != nil {
+		return nil, fmt.Errorf("failed to init iv: %w", err)
+	}
+
+	stream := cipher.NewCFBEncrypter(block, iv)
+	stream.XORKeyStream(cipherText[aes.BlockSize:], inBytes)
+
+	return []byte(base64.StdEncoding.EncodeToString(cipherText)), nil
+}