From b6bb1f400714e45fcae1144f514f3ca6ce4c0e69 Mon Sep 17 00:00:00 2001
From: Rama Priyanto <priyantorama12@gmail.com>
Date: Thu, 8 Jan 2026 14:49:23 +0700
Subject: [PATCH] fix:ai chat file viewer

---
 .../service/ai_chat_files.service.go          | 50 +++++++++++--------
 1 file changed, 28 insertions(+), 22 deletions(-)

diff --git a/app/module/ai_chat_files/service/ai_chat_files.service.go b/app/module/ai_chat_files/service/ai_chat_files.service.go
index 9cdfa7c..a0513e9 100644
--- a/app/module/ai_chat_files/service/ai_chat_files.service.go
+++ b/app/module/ai_chat_files/service/ai_chat_files.service.go
@@ -4,9 +4,7 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"log"
 	"math/rand"
-	"mime"
 	"mime/multipart"
 	"narasi-ahli-be/app/module/ai_chat_files/mapper"
 	"narasi-ahli-be/app/module/ai_chat_files/repository"
@@ -296,8 +294,9 @@ func (_i *aiChatFilesService) Delete(id uint) error {
 	return _i.Repo.Update(id, result)
 }
 
-func (_i *aiChatFilesService) Viewer(c *fiber.Ctx) (err error) {
+func (_i *aiChatFilesService) Viewer(c *fiber.Ctx) error {
 	filename := c.Params("filename")
+
 	result, err := _i.Repo.FindByFilename(filename)
 	if err != nil {
 		return err
@@ -307,41 +306,48 @@ func (_i *aiChatFilesService) Viewer(c *fiber.Ctx) (err error) {
 	bucketName := _i.MinioStorage.Cfg.ObjectStorage.MinioStorage.BucketName
 	objectName := *result.FilePath
 
-	_i.Log.Info().Str("timestamp", time.Now().
-		Format(time.RFC3339)).Str("Service:Resource", "AiChat:Uploads").
-		Interface("data", objectName).Msg("")
-
-	// Create minio connection.
 	minioClient, err := _i.MinioStorage.ConnectMinio()
 	if err != nil {
-		// Return status 500 and minio connection error.
 		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
 			"error": true,
 			"msg":   err.Error(),
 		})
 	}
 
-	fileContent, err := minioClient.GetObject(ctx, bucketName, objectName, minio.GetObjectOptions{})
+	object, err := minioClient.GetObject(
+		ctx,
+		bucketName,
+		objectName,
+		minio.GetObjectOptions{},
+	)
 	if err != nil {
-		log.Fatalln(err)
+		return err
 	}
-	defer fileContent.Close()
+	defer object.Close()
 
-	// Tentukan Content-Type berdasarkan ekstensi file
-	contentType := mime.TypeByExtension("." + getFileExtension(objectName))
-	if contentType == "" {
-		contentType = "application/octet-stream" // fallback jika tidak ada tipe MIME yang cocok
-	}
-
-	c.Set("Content-Type", contentType)
-
-	if _, err := io.Copy(c.Response().BodyWriter(), fileContent); err != nil {
+	// 🔥 Ambil metadata object (INI PENTING)
+	stat, err := object.Stat()
+	if err != nil {
 		return err
 	}
 
-	return
+	// 🔥 Content-Type yang BENAR
+	if stat.ContentType != "" {
+		c.Set("Content-Type", stat.ContentType)
+	} else {
+		// fallback kalau metadata kosong
+		c.Type(filepath.Ext(objectName))
+	}
+
+	// 🔥 WAJIB untuk preview media
+	c.Set("Content-Disposition", "inline")
+	c.Set("Accept-Ranges", "bytes")
+
+	// 🔥 BIARKAN FIBER HANDLE STREAMING
+	return c.SendStream(object)
 }
 
+
 func getFileExtension(filename string) string {
 	// split file name
 	parts := strings.Split(filename, ".")