Refactor CreatePost and EditPost logic to migrate images from tmpfiles to files; add utility function to extract image keys from content

app/internal/utils/content.go

@@ -0,0 +1,39 @@
+package utils
+
+import (
+	"encoding/json"
+)
+
+// ExtractImageKeysFromContent parses the rich text JSON and extracts all image fileKey values
+func ExtractImageKeysFromContent(content string) ([]string, error) {
+	var contentData map[string]interface{}
+	if err := json.Unmarshal([]byte(content), &contentData); err != nil {
+		return nil, err
+	}
+
+	var imageKeys []string
+	extractImageKeys(contentData, &imageKeys)
+	return imageKeys, nil
+}
+
+// extractImageKeys recursively searches for image nodes and collects their fileKey values
+func extractImageKeys(data interface{}, keys *[]string) {
+	switch v := data.(type) {
+	case map[string]interface{}:
+		// Check if this is an image node
+		if nodeType, ok := v["type"].(string); ok && nodeType == "image" {
+			if fileKey, ok := v["fileKey"].(string); ok && fileKey != "" {
+				*keys = append(*keys, fileKey)
+			}
+		}
+		// Recurse into all map values
+		for _, value := range v {
+			extractImageKeys(value, keys)
+		}
+	case []interface{}:
+		// Recurse into all array elements
+		for _, item := range v {
+			extractImageKeys(item, keys)
+		}
+	}
+}