feat(admin): 存储管理 - 新增资源只读查询、统计与预览

Adapted from ddcat-ai/open-ai-canvas#339

Original commit: fcdbe2aa833f31f683f709b7f409a0534ed78e20

Refs #339

Co-authored-by: 宇熙 <101980758+yuxiwl@users.noreply.github.com>

backend/internal/service/admin_storage_test.go

@@ -0,0 +1,109 @@
+package service
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"infinite-canvas/backend/internal/model"
+	"infinite-canvas/backend/internal/repository"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+func TestAdminStorageListStatsAndPreview(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	sqlDB, err := db.DB()
+	if err != nil {
+		t.Fatal(err)
+	}
+	sqlDB.SetMaxOpenConns(1)
+	if err := db.AutoMigrate(&model.User{}, &model.Resource{}, &model.UserOSSSetting{}, &model.StorageLocation{}, &model.SystemSetting{}); err != nil {
+		t.Fatal(err)
+	}
+	users := []model.User{
+		{ID: "admin", Username: "admin", DisplayName: "管理员", Role: model.UserRoleAdmin, Status: model.UserStatusActive},
+		{ID: "user-1", Username: "creator", DisplayName: "创作者", Role: model.UserRoleUser, Status: model.UserStatusActive},
+	}
+	if err := db.Create(&users).Error; err != nil {
+		t.Fatal(err)
+	}
+	now := time.Now()
+	resources := []model.Resource{
+		{ID: "image-ready", UserID: "user-1", Kind: "image", Status: model.ResourceStatusReady, Provider: "", ObjectKey: "users/user-1/image/ready.png", MimeType: "image/png", Size: 128, CreatedAt: now.Add(-time.Minute), UpdatedAt: now},
+		{ID: "image-failed", UserID: "user-1", Kind: "image", Status: model.ResourceStatusFailed, Provider: "local", ObjectKey: "users/user-1/image/failed.png", MimeType: "image/png", Size: 64, CreatedAt: now.Add(-2 * time.Minute), UpdatedAt: now},
+		{ID: "video-ready", UserID: "admin", Kind: "video", Status: model.ResourceStatusReady, Provider: "s3", Bucket: "media", ObjectKey: "video/ready.mp4", MimeType: "video/mp4", Size: 256, CreatedAt: now.Add(-3 * time.Minute), UpdatedAt: now},
+		{ID: "image-shared", UserID: "admin", Kind: "image", Status: model.ResourceStatusReady, Provider: "local", ObjectKey: "users/user-1/image/ready.png", MimeType: "image/png", Size: 128, CreatedAt: now.Add(-4 * time.Minute), UpdatedAt: now},
+	}
+	if err := db.Create(&resources).Error; err != nil {
+		t.Fatal(err)
+	}
+	dataDir := t.TempDir()
+	filePath := filepath.Join(dataDir, "resources", filepath.FromSlash(resources[0].ObjectKey))
+	if err := os.MkdirAll(filepath.Dir(filePath), 0o750); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filePath, []byte("image-data"), 0o640); err != nil {
+		t.Fatal(err)
+	}
+	svc := New(repository.New(db), dataDir)
+	admin := &users[0]
+
+	page, err := svc.AdminResourcePage(admin, AdminResourceQuery{Kind: "image", Provider: "local", Page: 1, Limit: 20})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if page.Total != 3 || len(page.Items) != 3 || page.Items[0].UserName != "创作者" {
+		t.Fatalf("page = %+v", page)
+	}
+	if page.Items[0].PhysicalBytes != 128 || page.Items[1].PhysicalBytes != 0 {
+		t.Fatalf("physical bytes = %+v", page.Items)
+	}
+
+	stats, err := svc.AdminStorageStats(admin)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if stats.ResourceCount != 4 || stats.ReadyCount != 3 || stats.LogicalBytes != 576 || stats.PhysicalBytes != 384 || stats.LocalBytes != 128 || stats.RemoteBytes != 256 {
+		t.Fatalf("stats = %+v", stats)
+	}
+	if len(stats.ByKind) != 2 || stats.ByKind[0].Kind != "image" || stats.ByKind[0].PhysicalBytes != 128 {
+		t.Fatalf("kind stats = %+v", stats.ByKind)
+	}
+
+	stream, err := svc.OpenResourceRangeAsAdmin(admin, resources[0].ID, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer stream.Body.Close()
+	data, err := io.ReadAll(stream.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(data) != "image-data" {
+		t.Fatalf("preview data = %q", data)
+	}
+}
+
+func TestAdminStorageRejectsNonAdminAndInvalidFilters(t *testing.T) {
+	svc := &Service{}
+	user := &model.User{ID: "user", Role: model.UserRoleUser, Status: model.UserStatusActive}
+	if _, err := svc.AdminResourcePage(user, AdminResourceQuery{}); err == nil {
+		t.Fatal("expected non-admin resource list to be rejected")
+	}
+	if _, _, _, err := normalizeAdminResourceQuery(AdminResourceQuery{Provider: "unknown"}); err == nil {
+		t.Fatal("expected invalid provider filter to be rejected")
+	}
+	if _, _, _, err := normalizeAdminResourceQuery(AdminResourceQuery{Status: "unknown"}); err == nil {
+		t.Fatal("expected invalid status filter to be rejected")
+	}
+	if _, err := svc.AdminStorageStats(user); err == nil {
+		t.Fatal("expected non-admin stats to be rejected")
+	}
+}