feat(task): attach creator to `user` of the context (#7729)

internal/task/base.go

@@ -1,13 +1,17 @@
 package task
 
 import (
+	"context"
 	"github.com/alist-org/alist/v3/internal/model"
 	"github.com/xhofe/tache"
+	"sync"
 	"time"
 )
 
 type TaskExtension struct {
 	tache.Base
+	ctx          context.Context
+	ctxInitMutex sync.Mutex
 	Creator      *model.User
 	startTime    *time.Time
 	endTime      *time.Time
@@ -51,6 +55,17 @@ func (t *TaskExtension) GetTotalBytes() int64 {
 	return t.totalBytes
 }
 
+func (t *TaskExtension) Ctx() context.Context {
+	if t.ctx == nil {
+		t.ctxInitMutex.Lock()
+		if t.ctx == nil {
+			t.ctx = context.WithValue(t.Base.Ctx(), "user", t.Creator)
+		}
+		t.ctxInitMutex.Unlock()
+	}
+	return t.ctx
+}
+
 type TaskExtensionInfo interface {
 	tache.TaskWithInfo
 	GetCreator() *model.User