Only show Followers that current user can access (#20220) (#20253)

Backport #20220

Users who are following or being followed by a user should only be
displayed if the viewing user can see them.

Signed-off-by: Andrew Thornton <art27@cantab.net>

3 files changed, 60 insertions, 18 deletions

diff --git a/models/user/user.go b/models/user/user.go
index e375f3de0a..7e7657070a 100644
--- a/models/user/user.go
+++ b/models/user/user.go
@@ -316,37 +316,45 @@ func (u *User) GenerateEmailActivateCode(email string) string {
 }
 
 // GetUserFollowers returns range of user's followers.
-func GetUserFollowers(u *User, listOptions db.ListOptions) ([]*User, error) {
-	sess := db.GetEngine(db.DefaultContext).
+func GetUserFollowers(ctx context.Context, u, viewer *User, listOptions db.ListOptions) ([]*User, int64, error) {
+	sess := db.GetEngine(ctx).
+		Select("`user`.*").
+		Join("LEFT", "follow", "`user`.id=follow.user_id").
 		Where("follow.follow_id=?", u.ID).
-		Join("LEFT", "follow", "`user`.id=follow.user_id")
+		And(isUserVisibleToViewerCond(viewer))
 
 	if listOptions.Page != 0 {
 		sess = db.SetSessionPagination(sess, &listOptions)
 
 		users := make([]*User, 0, listOptions.PageSize)
-		return users, sess.Find(&users)
+		count, err := sess.FindAndCount(&users)
+		return users, count, err
 	}
 
 	users := make([]*User, 0, 8)
-	return users, sess.Find(&users)
+	count, err := sess.FindAndCount(&users)
+	return users, count, err
 }
 
 // GetUserFollowing returns range of user's following.
-func GetUserFollowing(u *User, listOptions db.ListOptions) ([]*User, error) {
+func GetUserFollowing(ctx context.Context, u, viewer *User, listOptions db.ListOptions) ([]*User, int64, error) {
 	sess := db.GetEngine(db.DefaultContext).
+		Select("`user`.*").
+		Join("LEFT", "follow", "`user`.id=follow.follow_id").
 		Where("follow.user_id=?", u.ID).
-		Join("LEFT", "follow", "`user`.id=follow.follow_id")
+		And(isUserVisibleToViewerCond(viewer))
 
 	if listOptions.Page != 0 {
 		sess = db.SetSessionPagination(sess, &listOptions)
 
 		users := make([]*User, 0, listOptions.PageSize)
-		return users, sess.Find(&users)
+		count, err := sess.FindAndCount(&users)
+		return users, count, err
 	}
 
 	users := make([]*User, 0, 8)
-	return users, sess.Find(&users)
+	count, err := sess.FindAndCount(&users)
+	return users, count, err
 }
 
 // NewGitSig generates and returns the signature of given user.
@@ -1231,3 +1239,36 @@ func GetAdminUser() (*User, error) {
 
 	return &admin, nil
 }
+
+func isUserVisibleToViewerCond(viewer *User) builder.Cond {
+	if viewer != nil && viewer.IsAdmin {
+		return builder.NewCond()
+	}
+
+	if viewer == nil || viewer.IsRestricted {
+		return builder.Eq{
+			"`user`.visibility": structs.VisibleTypePublic,
+		}
+	}
+
+	return builder.Neq{
+		"`user`.visibility": structs.VisibleTypePrivate,
+	}.Or(
+		builder.In("`user`.id",
+			builder.
+				Select("`follow`.user_id").
+				From("follow").
+				Where(builder.Eq{"`follow`.follow_id": viewer.ID})),
+		builder.In("`user`.id",
+			builder.
+				Select("`team_user`.uid").
+				From("team_user").
+				Join("INNER", "`team_user` AS t2", "`team_user`.id = `t2`.id").
+				Where(builder.Eq{"`t2`.uid": viewer.ID})),
+		builder.In("`user`.id",
+			builder.
+				Select("`team_user`.uid").
+				From("team_user").
+				Join("INNER", "`team_user` AS t2", "`team_user`.org_id = `t2`.org_id").
+				Where(builder.Eq{"`t2`.uid": viewer.ID})))
+}
diff --git a/routers/api/v1/user/follower.go b/routers/api/v1/user/follower.go
index 1eacb89db2..d648d50d69 100644
--- a/routers/api/v1/user/follower.go
+++ b/routers/api/v1/user/follower.go
@@ -24,13 +24,13 @@ func responseAPIUsers(ctx *context.APIContext, users []*user_model.User) {
 }
 
 func listUserFollowers(ctx *context.APIContext, u *user_model.User) {
-	users, err := user_model.GetUserFollowers(u, utils.GetListOptions(ctx))
+	users, count, err := user_model.GetUserFollowers(ctx, u, ctx.User, utils.GetListOptions(ctx))
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "GetUserFollowers", err)
 		return
 	}
 
-	ctx.SetTotalCountHeader(int64(u.NumFollowers))
+	ctx.SetTotalCountHeader(count)
 	responseAPIUsers(ctx, users)
 }
 
@@ -90,13 +90,13 @@ func ListFollowers(ctx *context.APIContext) {
 }
 
 func listUserFollowing(ctx *context.APIContext, u *user_model.User) {
-	users, err := user_model.GetUserFollowing(u, utils.GetListOptions(ctx))
+	users, count, err := user_model.GetUserFollowing(ctx, u, ctx.User, utils.GetListOptions(ctx))
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "GetUserFollowing", err)
 		return
 	}
 
-	ctx.SetTotalCountHeader(int64(u.NumFollowing))
+	ctx.SetTotalCountHeader(count)
 	responseAPIUsers(ctx, users)
 }
 
diff --git a/routers/web/user/profile.go b/routers/web/user/profile.go
index 40fc44ed14..5366a4c2cb 100644
--- a/routers/web/user/profile.go
+++ b/routers/web/user/profile.go
@@ -234,7 +234,7 @@ func Profile(ctx *context.Context) {
 	ctx.Data["Keyword"] = keyword
 	switch tab {
 	case "followers":
-		items, err := user_model.GetUserFollowers(ctxUser, db.ListOptions{
+		items, count, err := user_model.GetUserFollowers(ctx, ctxUser, ctx.User, db.ListOptions{
 			PageSize: setting.UI.User.RepoPagingNum,
 			Page:     page,
 		})
@@ -244,9 +244,9 @@ func Profile(ctx *context.Context) {
 		}
 		ctx.Data["Cards"] = items
 
-		total = ctxUser.NumFollowers
+		total = int(count)
 	case "following":
-		items, err := user_model.GetUserFollowing(ctxUser, db.ListOptions{
+		items, count, err := user_model.GetUserFollowing(ctx, ctxUser, ctx.User, db.ListOptions{
 			PageSize: setting.UI.User.RepoPagingNum,
 			Page:     page,
 		})
@@ -256,9 +256,10 @@ func Profile(ctx *context.Context) {
 		}
 		ctx.Data["Cards"] = items
 
-		total = ctxUser.NumFollowing
+		total = int(count)
 	case "activity":
-		ctx.Data["Feeds"] = feed.RetrieveFeeds(ctx, models.GetFeedsOptions{RequestedUser: ctxUser,
+		ctx.Data["Feeds"] = feed.RetrieveFeeds(ctx, models.GetFeedsOptions{
+			RequestedUser:   ctxUser,
 			Actor:           ctx.User,
 			IncludePrivate:  showPrivate,
 			OnlyPerformedBy: true,