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lib/helper/helper.go

@@ -0,0 +1,98 @@
+package helper
+
+import (
+	"fmt"
+	"mime"
+	"net/url"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func ParseSizeToKB(sizeStr string) (int64, error) {
+	s := strings.TrimSpace(strings.ToLower(sizeStr))
+
+	var multiplier float64
+	switch {
+	case strings.HasSuffix(s, "gb"):
+		multiplier = 1024 * 1024
+		s = strings.TrimSuffix(s, "gb")
+	case strings.HasSuffix(s, "mb"):
+		multiplier = 1024
+		s = strings.TrimSuffix(s, "mb")
+	case strings.HasSuffix(s, "kb"):
+		multiplier = 1
+		s = strings.TrimSuffix(s, "kb")
+	default:
+		return 0, fmt.Errorf("unrecognized unit in %q", sizeStr)
+	}
+
+	s = strings.TrimSpace(s)
+	value, err := strconv.ParseFloat(s, 64)
+	if err != nil {
+		return 0, fmt.Errorf("invalid number %q: %w", s, err)
+	}
+
+	return int64(value * multiplier), nil
+}
+
+func FormatSizeFromKB(sizeKB int64) (string, error) {
+	if sizeKB < 0 {
+		return "", fmt.Errorf("size must be non-negative")
+	}
+
+	units := []string{"Kb", "Mb", "Gb", "Tb"} //Add more if needed.
+	unitIndex := 0
+
+	sizeFloat := float64(sizeKB)
+
+	for sizeFloat >= 1024 && unitIndex < len(units)-1 {
+		sizeFloat /= 1024
+		unitIndex++
+	}
+
+	return fmt.Sprintf("%.2f %s", sizeFloat, units[unitIndex]), nil
+}
+
+func GetLastPathElement(u *url.URL) string {
+
+	path := u.Path
+	if path == "" {
+		return "" // Handle empty path
+	}
+
+	parts := strings.Split(path, "/")
+	if len(parts) == 0 {
+		return ""
+	}
+
+	return parts[len(parts)-1]
+}
+
+func GetMimeTypeFromFilename(filename string) string {
+	ext := strings.ToLower(filepath.Ext(filename))
+	if ext == "" {
+		return "application/octet-stream" // fallback
+	}
+
+	mimeType := mime.TypeByExtension(ext)
+	if mimeType != "" {
+		return mimeType
+	}
+
+	// handle common missing types
+	switch ext {
+	case ".mov":
+		return "video/quicktime"
+	case ".rar":
+		return "application/x-rar-compressed"
+	default:
+		return "application/octet-stream"
+	}
+}
+
+func ParseCustomDateTime(input string) (time.Time, error) {
+	layout := "15:04:05 02/01/2006"
+	return time.Parse(layout, input)
+}