移动端支持下载人信息与筛选（仅管理员）

- 详情抽屉显示下载人昵称，取不到时回退为 #id
- 任务列表新增「下载人」筛选，选项从当前分类派生，切分类时清空
- 管理员判定改用后端下发的 isAdmin，不再硬编码 userId === 3

src/store/index.js

@@ -325,6 +325,8 @@ const mutations = {
         state.AuthCode = data.AuthCode
         state.userId = data.userId
         state.username = data.username
+        state.isAdmin = Boolean(data.isAdmin)
+        state.downloaderFilter = null
         state.isAuth = true
         ElMessage("验证成功,加载中")
     },
@@ -402,6 +404,8 @@ const mutations = {
     _setCategory(state, category){
         state.category = category
         state.visiblePages = 1
+        // 换分类后旧的下载人筛选可能在新分类里根本不存在，先清掉。
+        state.downloaderFilter = null
         confirmCurrentTask(state)
         sortTasks(state)
     },
@@ -413,6 +417,12 @@ const mutations = {
     _setGalleryNameType(state, galleryNameType){
         state.galleryNameType = galleryNameType
     },
+    _setDownloaderFilter(state, downloader){
+        state.downloaderFilter = downloader === null || downloader === undefined
+            ? null
+            : Number(downloader)
+        state.visiblePages = 1
+    },
     _setShowNameType(state, type){
         if(type === "shortName")
             state.length = state.shortLength
@@ -481,23 +491,23 @@ const state = {
     sortType:'shortName',                    //排序类型   shortName name createTime
     currentTasks: [],                        //当前任务
     weekUsed: {},                            //每周用量
+    isAdmin: false,                          //管理员（后端 validate 下发）
+    downloaderFilter: null,                  //管理员按下载人筛选，null 表示全部
 }
 
 const getters = {
     currentTasks(state){
-        if(state.isSearch)
-            return state.searchTask.slice((state.page - 1) * state.length, state.page * state.length)
-        else
-            return state.currentTasks.slice((state.page - 1) * state.length, state.page * state.length)
+        const tasks = activeTaskList(state)
+        return tasks.slice((state.page - 1) * state.length, state.page * state.length)
     },
     min(){
         return 1
     },
     visibleTasks(state){
-        return (state.currentTasks || []).slice(0, state.visiblePages * state.length)
+        return activeTaskList(state).slice(0, state.visiblePages * state.length)
     },
     taskTotal(state){
-        return (state.currentTasks || []).length
+        return activeTaskList(state).length
     },
     taskRemaining(state, getters){
         return Math.max(0, getters.taskTotal - state.visiblePages * state.length)
@@ -507,11 +517,7 @@ const getters = {
     },
     max(state){
         let max = 0
-        let tasks
-        if(state.isSearch)
-            tasks = state.searchTask
-        else
-            tasks = state.currentTasks
+        const tasks = activeTaskList(state)
 
         if(!tasks)
             return 1
@@ -531,6 +537,18 @@ export default new vuex.Store({
     getters
 })
 
+/**
+ * 当前视图实际要展示的任务。
+ * 下载人筛选只在管理员生效，作用于「我的下载/收藏/全部」三种分类的结果。
+ */
+function activeTaskList(state){
+    if(state.isSearch)
+        return state.searchTask
+    if(state.isAdmin && state.downloaderFilter !== null)
+        return state.currentTasks.filter(task => task.downloader === state.downloaderFilter)
+    return state.currentTasks
+}
+
 function getShortname(name){
     if(name === null)
         return null