From 4fc4fa6209e23a67cb649afc4408c357ef964399 Mon Sep 17 00:00:00 2001
From: t-takahashi <tttol.t4k.b1z@gmail.com>
Date: Fri, 19 Jul 2024 06:31:39 +0900
Subject: [PATCH] add

---
 core/amazon/awssdk/listobjects_v2.go      | 24 ++++++++++++++--
 core/amazon/awssdk/listobjects_v2_test.go | 34 +++++++++++++++++++++++
 2 files changed, 55 insertions(+), 3 deletions(-)

diff --git a/core/amazon/awssdk/listobjects_v2.go b/core/amazon/awssdk/listobjects_v2.go
index 0a7c737..fe58b04 100644
--- a/core/amazon/awssdk/listobjects_v2.go
+++ b/core/amazon/awssdk/listobjects_v2.go
@@ -42,14 +42,20 @@ func ListObjectsV2(w http.ResponseWriter, r *http.Request, uploadDirName string)
 		http.Error(w, "Failed to list objects", http.StatusInternalServerError)
 		return
 	}
+	slog.Info("Items are below", "files", items)
 
-	slog.Info("Files are below", "files", items)
+	prefix := r.URL.Query().Get("prefix")
+	delimiter := r.URL.Query().Get("delimiter")
+	filteredItems := FilterWithPrefix(prefix, delimiter, items)
 
-	isTruncated, items := IsTruncated(items)
+	slog.Info("FilteredItems are below", "files", filteredItems)
+
+	isTruncated, truncatedItems := IsTruncated(filteredItems)
+	slog.Info("TruncatedItems are below", "files", truncatedItems)
 
 	response := ListObjectsResult{
 		Name:        dir,
-		Items:       items,
+		Items:       truncatedItems,
 		IsTruncated: isTruncated,
 	}
 
@@ -78,6 +84,18 @@ func ListObjects(rootDir string, uploadDirName string) ([]Item, error) {
 	return items, err
 }
 
+func FilterWithPrefix(prefix string, delimiter string, items []Item) []Item {
+	var filteredItems []Item
+
+	p := strings.Replace(prefix, delimiter, "/", -1)
+	for _, item := range items {
+		if strings.HasPrefix(item.Key, p) {
+			filteredItems = append(filteredItems, item)
+		}
+	}
+	return filteredItems
+}
+
 func IsTruncated(items []Item) (bool, []Item) {
 	if len(items) > 1000 {
 		return true, items[:1000]
diff --git a/core/amazon/awssdk/listobjects_v2_test.go b/core/amazon/awssdk/listobjects_v2_test.go
index f232b80..566ce48 100644
--- a/core/amazon/awssdk/listobjects_v2_test.go
+++ b/core/amazon/awssdk/listobjects_v2_test.go
@@ -52,6 +52,40 @@ func TestListObjects(t *testing.T) {
 	}
 }
 
+func TestFilterWithPrefix(t *testing.T) {
+	items := []Item{
+		{Key: "file1.txt", Size: 1},
+		{Key: "dir1/file1.txt", Size: 1},
+		{Key: "dir1/file2.txt", Size: 1},
+		{Key: "dir1/pic1.png", Size: 1},
+		{Key: "dir1/pic2.png", Size: 1},
+		{Key: "dir1/dir2/file1.txt", Size: 1},
+		{Key: "dir1/dir2/file2.txt", Size: 1},
+		{Key: "dir1/dir2/file3.txt", Size: 1},
+	}
+
+	expected := []Item{{Key: "file1.txt", Size: 1}}
+	assert.Equal(t, FilterWithPrefix("file", "%2F", items), expected)
+
+	expected = []Item{{Key: "dir1/file1.txt", Size: 1},
+		{Key: "dir1/file2.txt", Size: 1},
+		{Key: "dir1/pic1.png", Size: 1},
+		{Key: "dir1/pic2.png", Size: 1},
+		{Key: "dir1/dir2/file1.txt", Size: 1},
+		{Key: "dir1/dir2/file2.txt", Size: 1},
+		{Key: "dir1/dir2/file3.txt", Size: 1}}
+	assert.Equal(t, FilterWithPrefix("dir1", "%2F", items), expected)
+
+	expected = []Item{{Key: "dir1/file1.txt", Size: 1},
+		{Key: "dir1/file2.txt", Size: 1}}
+	assert.Equal(t, FilterWithPrefix("dir1/fi", "%2F", items), expected)
+
+	expected = []Item{{Key: "dir1/dir2/file1.txt", Size: 1},
+		{Key: "dir1/dir2/file2.txt", Size: 1},
+		{Key: "dir1/dir2/file3.txt", Size: 1}}
+	assert.Equal(t, FilterWithPrefix("dir1/dir2", "%2F", items), expected)
+}
+
 func TestIsTruncated(t *testing.T) {
 	items1 := make([]Item, 1)
 	items999 := make([]Item, 999)