feat: add followed users and activity

app/Shared/Localization/zh-Hans.lproj/Localizable.strings

@@ -131,6 +131,14 @@
 "%@'s Posts" = "%@ 的回复";
 "Posts" = "回复";
 "My Profile" = "我的档案";
+"Following" = "关注用户";
+"Following Activity" = "关注动态";
+"No Followed Users" = "还没有关注用户";
+"No Following Activity" = "还没有关注动态";
+"Follow" = "关注";
+"Unfollow" = "取消关注";
+"Posted a Reply" = "发表了回复";
+"Published a Topic" = "发布了主题";
 "Edit Favorites" = "编辑收藏";
 "Posting" = "发表";
 "Device Identity" = "设备身份";

app/Shared/Views/FollowListView.swift

@@ -0,0 +1,101 @@
+import SwiftUI
+
+struct FollowUserListView: View {
+  typealias DataSource = PagingDataSource<FollowUserListResponse, User>
+
+  @StateObject private var dataSource: DataSource
+
+  init() {
+    _dataSource = StateObject(wrappedValue: DataSource(
+      buildRequest: { page in
+        .followUserList(.with { $0.page = UInt32(page) })
+      },
+      onResponse: { ($0.users, Int($0.pages)) },
+      id: \.id,
+    ))
+  }
+
+  var body: some View {
+    List {
+      if dataSource.notLoaded {
+        LoadingRowView().onAppear { dataSource.initialLoad() }
+      } else if dataSource.items.isEmpty {
+        EmptyRowView(title: "No Followed Users")
+      } else {
+        ForEach(dataSource.items, id: \.id) { user in
+          NavigationLink(destination: UserProfileView.build(user: user)) {
+            UserView(user: user, style: .normal)
+          }
+          .onAppear { dataSource.loadMoreIfNeeded(currentItem: user) }
+        }
+      }
+    }
+    .refreshable { await dataSource.refreshAsync(animated: true) }
+    .mayGroupedListStyle()
+    .navigationTitle("Following")
+  }
+}
+
+struct FollowActivityRowView: View {
+  let activity: FollowActivity
+
+  var destination: some View {
+    let postID: PostId? = activity.hasPost ? activity.post.id : nil
+    return TopicDetailsView.build(topicBinding: .constant(activity.topic), onlyPost: (postID, nil))
+  }
+
+  var body: some View {
+    CrossStackNavigationLinkHack(destination: destination, id: activity.id) {
+      VStack(alignment: .leading, spacing: 8) {
+        HStack {
+          UserView(user: activity.user, style: .compact)
+          Spacer()
+          Text(activity.type == .reply ? "Posted a Reply" : "Published a Topic")
+            .font(.caption)
+            .foregroundStyle(.secondary)
+        }
+
+        if activity.hasPost {
+          TopicPostRowView(topic: activity.topic, post: activity.post)
+        } else {
+          TopicRowView(topic: activity.topic, useTopicPostDate: true, dimmedSubject: false)
+        }
+      }
+      .padding(.vertical, 2)
+    }
+  }
+}
+
+struct FollowActivityListView: View {
+  typealias DataSource = PagingDataSource<FollowActivityListResponse, FollowActivity>
+
+  @StateObject private var dataSource: DataSource
+
+  init() {
+    _dataSource = StateObject(wrappedValue: DataSource(
+      buildRequest: { page in
+        .followActivityList(.with { $0.page = UInt32(page) })
+      },
+      onResponse: { ($0.activities, Int($0.pages)) },
+      id: \.id,
+    ))
+  }
+
+  var body: some View {
+    List {
+      if dataSource.notLoaded {
+        LoadingRowView().onAppear { dataSource.initialLoad() }
+      } else if dataSource.items.isEmpty {
+        EmptyRowView(title: "No Following Activity")
+      } else {
+        ForEach(dataSource.items, id: \.id) { activity in
+          FollowActivityRowView(activity: activity)
+            .onAppear { dataSource.loadMoreIfNeeded(currentItem: activity) }
+        }
+      }
+    }
+    .refreshable { await dataSource.refreshAsync(animated: true) }
+    .mayGroupedListStyle()
+    .navigationTitle("Following Activity")
+  }
+}

app/Shared/Views/UserMenuView.swift

@@ -114,6 +114,12 @@ struct UserMenuView: View {
           NavigationLink(destination: FavoriteTopicListView()) {
             Label("Favorite Topics", systemImage: "bookmark")
           }
+          NavigationLink(destination: FollowActivityListView()) {
+            Label("Following Activity", systemImage: "person.line.dotted.person.fill")
+          }
+          NavigationLink(destination: FollowUserListView()) {
+            Label("Following", systemImage: "person.2")
+          }
         }
         PlusCheckNavigationLink(destination: TopicHistoryListView.build(), feature: .topicHistory) {
           Label("History", systemImage: "clock")

app/Shared/Views/UserProfileView.swift

@@ -32,6 +32,7 @@ struct UserProfileView: View {
   @StateObject var users = UsersModel.shared
 
   @State var tab = Tab.topics
+  @State var isModifyingFollow = false
 
   var isMyself: Bool {
     user.id == currentUser.user?.id
@@ -135,6 +136,15 @@ struct UserProfileView: View {
       }
     }
 
+    if !isMyself, !user.isAnonymous {
+      ToolbarItem(placement: .navigationBarTrailing) {
+        Button(action: { modifyFollow() }) {
+          Label(user.followed ? "Unfollow" : "Follow", systemImage: user.followed ? "person.fill.checkmark" : "person.badge.plus")
+        }
+        .disabled(isModifyingFollow)
+      }
+    }
+
     ToolbarItem(placement: .navigationBarTrailing) {
       Menu {
         if isMyself {
@@ -221,6 +231,24 @@ struct UserProfileView: View {
     signaturePostModel.show(action: .init(userID: user.id, initialSignature: initial))
   }
 
+  func modifyFollow() {
+    guard !isMyself, !user.isAnonymous, !isModifyingFollow else { return }
+    isModifyingFollow = true
+    Task {
+      let response: Result<FollowUserModifyResponse, LogicError> = await logicCallAsync(.followUserModify(.with {
+        $0.userID = user.id
+        $0.operation = user.followed ? .delete : .add
+      }))
+      switch response {
+      case let .success(response):
+        withAnimation { user.followed = response.followed }
+      case let .failure(error):
+        ToastModel.showAuto(.error(error.error))
+      }
+      isModifyingFollow = false
+    }
+  }
+
   func reloadUser() async {
     if let refreshed = await users.remoteUser(id: user.id, ignoreCache: true) {
       withAnimation { user = refreshed }

logic/service/src/dispatch/handlers_async.rs

@@ -17,7 +17,10 @@ use crate::{
         get_hot_topic_list, get_topic_details, get_topic_list, get_user_topic_list,
         modify_favorite_folder, search_topic, topic_favor,
     },
-    user::{get_remote_user, update_signature},
+    user::{
+        get_follow_activity_list, get_follow_user_list, get_remote_user, modify_follow_user,
+        update_signature,
+    },
 };
 use paste::paste;
 use protos::Service::*;
@@ -61,3 +64,6 @@ handle!(topic_search, search_topic);
 handle!(clock_in, clock_in);
 handle!(cache, manipulate_cache);
 handle!(user_signature_update, update_signature);
+handle!(follow_user_modify, modify_follow_user);
+handle!(follow_user_list, get_follow_user_list);
+handle!(follow_activity_list, get_follow_activity_list);

logic/service/src/dispatch/mod.rs

@@ -51,6 +51,9 @@ mod dispatch_async {
             clock_in(r) => r!(handle_clock_in(r)),
             cache(r) => r!(handle_cache(r)),
             user_signature_update(r) => r!(handle_user_signature_update(r)),
+            follow_user_modify(r) => r!(handle_follow_user_modify(r)),
+            follow_user_list(r) => r!(handle_follow_user_list(r)),
+            follow_activity_list(r) => r!(handle_follow_activity_list(r)),
         }
     }
 }