logging and diagnostic features added

internal/httpapp/validation_helpers.go

@@ -0,0 +1,58 @@
+package httpapp
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// parseSizeString parses a human-readable size string to bytes
+func (a *App) parseSizeString(sizeStr string) (uint64, error) {
+	sizeStr = strings.TrimSpace(strings.ToUpper(sizeStr))
+	if sizeStr == "" {
+		return 0, fmt.Errorf("size cannot be empty")
+	}
+
+	// Extract number and unit
+	var numStr string
+	var unit string
+
+	for i, r := range sizeStr {
+		if r >= '0' && r <= '9' {
+			numStr += string(r)
+		} else {
+			unit = sizeStr[i:]
+			break
+		}
+	}
+
+	if numStr == "" {
+		return 0, fmt.Errorf("invalid size format: no number found")
+	}
+
+	num, err := strconv.ParseUint(numStr, 10, 64)
+	if err != nil {
+		return 0, fmt.Errorf("invalid size number: %w", err)
+	}
+
+	// Convert to bytes based on unit
+	multiplier := uint64(1)
+	switch unit {
+	case "":
+		multiplier = 1
+	case "K", "KB":
+		multiplier = 1024
+	case "M", "MB":
+		multiplier = 1024 * 1024
+	case "G", "GB":
+		multiplier = 1024 * 1024 * 1024
+	case "T", "TB":
+		multiplier = 1024 * 1024 * 1024 * 1024
+	case "P", "PB":
+		multiplier = 1024 * 1024 * 1024 * 1024 * 1024
+	default:
+		return 0, fmt.Errorf("invalid size unit: %s (allowed: K, M, G, T, P)", unit)
+	}
+
+	return num * multiplier, nil
+}