Add archive file key extraction to CreatePost and EditPost logic; enhance file migration handling

app/internal/utils/content.go

@@ -39,6 +39,57 @@ func extractImageKeys(data interface{}, keys *[]string) {
 	}
 }
 
+// ExtractArchiveKeysFromContent parses the rich text JSON and extracts all archive fileKey values
+func ExtractArchiveKeysFromContent(content string) ([]string, error) {
+	var contentData map[string]interface{}
+	if err := json.Unmarshal([]byte(content), &contentData); err != nil {
+		return nil, err
+	}
+
+	var archiveKeys []string
+	extractArchiveKeys(contentData, &archiveKeys)
+	return archiveKeys, nil
+}
+
+// extractArchiveKeys recursively searches for archive nodes and collects their fileKey values
+func extractArchiveKeys(data interface{}, keys *[]string) {
+	switch v := data.(type) {
+	case map[string]interface{}:
+		// Check if this is an archive node
+		if nodeType, ok := v["type"].(string); ok && nodeType == "archive" {
+			if fileKey, ok := v["fileKey"].(string); ok && fileKey != "" {
+				*keys = append(*keys, fileKey)
+			}
+		}
+		// Recurse into all map values
+		for _, value := range v {
+			extractArchiveKeys(value, keys)
+		}
+	case []interface{}:
+		// Recurse into all array elements
+		for _, item := range v {
+			extractArchiveKeys(item, keys)
+		}
+	}
+}
+
+// ExtractAllFileKeysFromContent extracts both image and archive file keys from content
+func ExtractAllFileKeysFromContent(content string) ([]string, error) {
+	imageKeys, err := ExtractImageKeysFromContent(content)
+	if err != nil {
+		return nil, err
+	}
+
+	archiveKeys, err := ExtractArchiveKeysFromContent(content)
+	if err != nil {
+		return nil, err
+	}
+
+	// Combine both slices
+	allKeys := append(imageKeys, archiveKeys...)
+	return allKeys, nil
+}
+
 // ExtractHashtagsFromContent parses the rich text JSON and extracts all hashtag text values
 func ExtractHashtagsFromContent(content string) ([]string, error) {
 	var contentData map[string]interface{}