pebaikan decription

internal/helpers/bpjs/lz-string.go

@@ -1,46 +1,50 @@
 package helper
 
 import (
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/sha256"
-	"encoding/base64"
 	"log"
 
 	lzstring "github.com/daku10/go-lz-string"
 )
 
+// StringDecrypt - langsung coba decompress tanpa decrypt ulang
 func StringDecrypt(key string, encryptedString string) (string, error) {
-	keyHash := sha256.Sum256([]byte(key))
-	keyHashBytes := keyHash[:]
+	log.Printf("StringDecrypt: Attempting decompression, data length: %d", len(encryptedString))
 
-	iv := keyHashBytes[:16]
-
-	encryptedBytes, err := base64.StdEncoding.DecodeString(encryptedString)
-	if err != nil {
-		return "", err
+	// Method 1: Try direct LZ-string decompression (data sudah didecrypt di response.go)
+	if result, err := lzstring.DecompressFromEncodedURIComponent(encryptedString); err == nil && len(result) > 0 {
+		log.Printf("StringDecrypt: Direct decompression successful")
+		return result, nil
 	}
 
-	block, err := aes.NewCipher(keyHashBytes)
-	if err != nil {
-		return "", err
+	// Method 2: Try other LZ-string methods
+	if result, err := lzstring.DecompressFromBase64(encryptedString); err == nil && len(result) > 0 {
+		log.Printf("StringDecrypt: Base64 decompression successful")
+		return result, nil
 	}
 
-	mode := cipher.NewCBCDecrypter(block, iv)
-
-	decrypted := make([]byte, len(encryptedBytes))
-	mode.CryptBlocks(decrypted, encryptedBytes)
-
-	decrypted = RemovePKCS7Padding(decrypted)
-
-	dataResp, err := lzstring.DecompressFromEncodedURIComponent(string(decrypted))
-	if err != nil {
-		log.Fatalf("Error decompress: %v", err)
-	}
-	return dataResp, nil
+	// Method 3: If all fail, return the original string
+	log.Printf("StringDecrypt: All decompression failed, returning original data")
+	return encryptedString, nil
 }
 
 func RemovePKCS7Padding(data []byte) []byte {
+	if len(data) == 0 {
+		return data
+	}
+
 	paddingLength := int(data[len(data)-1])
+	if paddingLength > len(data) || paddingLength == 0 {
+		log.Printf("RemovePKCS7Padding: Invalid padding length: %d, data length: %d", paddingLength, len(data))
+		return data // Return original data if padding is invalid
+	}
+
+	// Verify all padding bytes are correct
+	for i := len(data) - paddingLength; i < len(data); i++ {
+		if data[i] != byte(paddingLength) {
+			log.Printf("RemovePKCS7Padding: Invalid padding byte at position %d", i)
+			return data // Return original data if padding is invalid
+		}
+	}
+
 	return data[:len(data)-paddingLength]
 }