fix(edge-stack) make protainer compatible with previous agent EE-5614 (#9220)

api/edge/edge.go

@@ -14,6 +14,9 @@ type (
 		// Name of the stack
 		Name string
 
+		// Content of the stack file (for compatibility to agent version less than 2.19.0)
+		StackFileContent string
+
 		// Content of stack folder
 		DirEntries []filesystem.DirEntry
 		// Name of the stack entry file

api/filesystem/serialize.go

@@ -2,9 +2,12 @@ package filesystem
 
 import (
 	"encoding/base64"
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
+
+	"golang.org/x/mod/semver"
 )
 
 type DirEntry struct {
@@ -46,6 +49,22 @@ func FilterDirForEntryFile(dirEntries []DirEntry, entryFile string) []DirEntry {
 	return filteredDirEntries
 }
 
+func FilterDirForCompatibility(dirEntries []DirEntry, entryFilePath, agentVersion string) (string, error) {
+
+	if semver.Compare(fmt.Sprintf("v%s", agentVersion), "v2.19.0") == -1 {
+		for _, dirEntry := range dirEntries {
+			if dirEntry.IsFile {
+				if dirEntry.Name == entryFilePath {
+					return DecodeFileContent(dirEntry.Content)
+				}
+			}
+		}
+		return "", fmt.Errorf("Entry file %s not found in dir entries", entryFilePath)
+	}
+
+	return "", nil
+}
+
 // LoadDir reads all files and folders recursively from the given directory
 // File content is base64-encoded
 func LoadDir(dir string) ([]DirEntry, error) {
@@ -127,14 +146,22 @@ func PersistDir(dir string, dirEntries []DirEntry) error {
 	return nil
 }
 
+func DecodeFileContent(encodedFileContent string) (string, error) {
+	decodedBytes, err := base64.StdEncoding.DecodeString(encodedFileContent)
+	if err != nil {
+		return "", err
+	}
+	return string(decodedBytes), nil
+}
+
 func DecodeDirEntries(dirEntries []DirEntry) error {
 	for index, dirEntry := range dirEntries {
 		if dirEntry.IsFile && dirEntry.Content != "" {
-			decodedBytes, err := base64.StdEncoding.DecodeString(dirEntry.Content)
+			decodedFile, err := DecodeFileContent(dirEntry.Content)
 			if err != nil {
 				return err
 			}
-			dirEntries[index].Content = string(decodedBytes)
+			dirEntries[index].Content = decodedFile
 		}
 	}
 

api/http/handler/endpointedge/endpointedge_stack_inspect.go

@@ -75,12 +75,18 @@ func (handler *Handler) endpointEdgeStackInspect(w http.ResponseWriter, r *http.
 		return httperror.InternalServerError("Unable to load repository", err)
 	}
 
+	fileContent, err := filesystem.FilterDirForCompatibility(dirEntries, fileName, endpoint.Agent.Version)
+	if err != nil {
+		return httperror.InternalServerError("File not found", err)
+	}
+
 	dirEntries = filesystem.FilterDirForEntryFile(dirEntries, fileName)
 
 	return response.JSON(w, edge.StackPayload{
-		DirEntries:    dirEntries,
-		EntryFileName: fileName,
-		Name:          edgeStack.Name,
-		Namespace:     namespace,
+		DirEntries:       dirEntries,
+		EntryFileName:    fileName,
+		StackFileContent: fileContent,
+		Name:             edgeStack.Name,
+		Namespace:        namespace,
 	})
 }