Add file info at top of post images

internal/util/posts.go

@@ -8,6 +8,7 @@ import (
 	"log"
 	"mime/multipart"
 	"os"
+	"path"
 	"path/filepath"
 	"strings"
 
@@ -111,3 +112,62 @@ func SumUniquePostIps(posts []database.Post) int {
 	}
 	return len(uniqueIpHashes)
 }
+
+type PostImageInfo struct {
+	Size   int64
+	Height int
+	Width  int
+}
+
+func GetPostImageInfo(mediaPath string) PostImageInfo {
+	var result PostImageInfo
+
+	imagePath := path.Join(POST_IMG_FULL_PATH, mediaPath)
+
+	fileInfo, err := os.Stat(imagePath)
+	if err != nil {
+		log.Printf("Failed to get image file info at %s: %v", mediaPath, err)
+		return PostImageInfo{}
+	}
+
+	file, err := os.Open(imagePath)
+	if err != nil {
+		log.Printf("Failed to open image at %s: %v", mediaPath, err)
+		return PostImageInfo{}
+	}
+	defer file.Close()
+
+	cfg, _, err := image.DecodeConfig(file)
+	if err != nil {
+		log.Printf("Failed to decode image at %s: %v", mediaPath, err)
+		return PostImageInfo{}
+	}
+
+	result.Size = fileInfo.Size()
+	result.Width = cfg.Width
+	result.Height = cfg.Height
+
+	return result
+}
+
+func FormatBytes(bytes int64) string {
+	const (
+		KB = 1 << 10 // 1024
+		MB = 1 << 20
+		GB = 1 << 30
+		TB = 1 << 40
+	)
+
+	switch {
+	case bytes >= TB:
+		return fmt.Sprintf("%.2f TB", float64(bytes)/float64(TB))
+	case bytes >= GB:
+		return fmt.Sprintf("%.2f GB", float64(bytes)/float64(GB))
+	case bytes >= MB:
+		return fmt.Sprintf("%.2f MB", float64(bytes)/float64(MB))
+	case bytes >= KB:
+		return fmt.Sprintf("%.2f KB", float64(bytes)/float64(KB))
+	default:
+		return fmt.Sprintf("%d B", bytes)
+	}
+}