feat: implement activity pagination

server/router/api/v1/activity_service.go

@@ -15,22 +15,39 @@ import (
 )
 
 func (s *APIV1Service) ListActivities(ctx context.Context, request *v1pb.ListActivitiesRequest) (*v1pb.ListActivitiesResponse, error) {
-	// Set default page size if not specified
-	pageSize := request.PageSize
-	if pageSize <= 0 || pageSize > 1000 {
-		pageSize = 100
+	var limit, offset int
+	if request.PageToken != "" {
+		var pageToken v1pb.PageToken
+		if err := unmarshalPageToken(request.PageToken, &pageToken); err != nil {
+			return nil, status.Errorf(codes.InvalidArgument, "invalid page token: %v", err)
+		}
+		limit = int(pageToken.Limit)
+		offset = int(pageToken.Offset)
+	} else {
+		limit = int(request.PageSize)
 	}
-
-	// TODO: Implement pagination with page_token and use pageSize for limiting
-	// For now, we'll fetch all activities and the pageSize will be used in future pagination implementation
-	_ = pageSize // Acknowledge pageSize variable to avoid linter warning
-
-	activities, err := s.Store.ListActivities(ctx, &store.FindActivity{})
+	if limit <= 0 {
+		limit = DefaultPageSize
+	}
+	limitPlusOne := limit + 1
+	activities, err := s.Store.ListActivities(ctx, &store.FindActivity{
+		Limit:  &limitPlusOne,
+		Offset: &offset,
+	})
 	if err != nil {
 		return nil, status.Errorf(codes.Internal, "failed to list activities: %v", err)
 	}
 
 	var activityMessages []*v1pb.Activity
+	nextPageToken := ""
+	if len(activities) == limitPlusOne {
+		activities = activities[:limit]
+		nextPageToken, err = getPageToken(limit, offset+limit)
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "failed to get next page token, error: %v", err)
+		}
+	}
+
 	for _, activity := range activities {
 		activityMessage, err := s.convertActivityFromStore(ctx, activity)
 		if err != nil {
@@ -40,8 +57,8 @@ func (s *APIV1Service) ListActivities(ctx context.Context, request *v1pb.ListAct
 	}
 
 	return &v1pb.ListActivitiesResponse{
-		Activities: activityMessages,
-		// TODO: Implement next_page_token for pagination
+		Activities:    activityMessages,
+		NextPageToken: nextPageToken,
 	}, nil
 }
 

server/router/api/v1/test/activity_service_test.go

@@ -0,0 +1,67 @@
+package test
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	apiv1 "github.com/usememos/memos/proto/gen/api/v1"
+)
+
+func TestListActivities(t *testing.T) {
+	ctx := context.Background()
+
+	ts := NewTestService(t)
+	defer ts.Cleanup()
+
+	// Create userOne
+	userOne, err := ts.CreateRegularUser(ctx, "test-user-1")
+	require.NoError(t, err)
+	userOneCtx := ts.CreateUserContext(ctx, userOne.ID)
+
+	// Create userTwo
+	userTwo, err := ts.CreateRegularUser(ctx, "test-user-2")
+	require.NoError(t, err)
+	userTwoCtx := ts.CreateUserContext(ctx, userTwo.ID)
+
+	// UserOne creates a memo
+	memo, err := ts.Service.CreateMemo(userOneCtx, &apiv1.CreateMemoRequest{
+		Memo: &apiv1.Memo{
+			Content: "Base memo",
+			Visibility: apiv1.Visibility_PUBLIC,
+		},
+	})
+	require.NoError(t, err)
+
+	// UserTwo creates 15 comments on the memo to generate 15 activities
+	for i := 0; i < 15; i++ {
+		_, err := ts.Service.CreateMemoComment(userTwoCtx, &apiv1.CreateMemoCommentRequest{
+			Name: memo.Name,
+			Comment: &apiv1.Memo{
+				Content: fmt.Sprintf("Comment %d", i),
+				Visibility: apiv1.Visibility_PUBLIC,
+			},
+		})
+		require.NoError(t, err)
+	}
+
+	// List activities with page size 10 (as admin or userOne)
+	// Activities are visible to the receiver (UserOne)
+	resp, err := ts.Service.ListActivities(userOneCtx, &apiv1.ListActivitiesRequest{
+		PageSize: 10,
+	})
+	require.NoError(t, err)
+	require.Len(t, resp.Activities, 10)
+	require.NotEmpty(t, resp.NextPageToken)
+
+	// List next page
+	resp, err = ts.Service.ListActivities(userOneCtx, &apiv1.ListActivitiesRequest{
+		PageSize:  10,
+		PageToken: resp.NextPageToken,
+	})
+	require.NoError(t, err)
+	require.Len(t, resp.Activities, 5)
+	require.Empty(t, resp.NextPageToken)
+}

store/activity.go

@@ -42,6 +42,10 @@ type Activity struct {
 type FindActivity struct {
 	ID   *int32
 	Type *ActivityType
+
+	// Pagination
+	Limit  *int
+	Offset *int
 }
 
 func (s *Store) CreateActivity(ctx context.Context, create *Activity) (*Activity, error) {

store/db/mysql/activity.go

@@ -2,8 +2,10 @@ package mysql
 
 import (
 	"context"
+	"fmt"
 	"strings"
 
+
 	"github.com/pkg/errors"
 	"google.golang.org/protobuf/encoding/protojson"
 
@@ -56,6 +58,13 @@ func (d *DB) ListActivities(ctx context.Context, find *store.FindActivity) ([]*s
 	}
 
 	query := "SELECT `id`, `creator_id`, `type`, `level`, `payload`, UNIX_TIMESTAMP(`created_ts`) FROM `activity` WHERE " + strings.Join(where, " AND ") + " ORDER BY `created_ts` DESC"
+	if find.Limit != nil {
+		query = fmt.Sprintf("%s LIMIT %d", query, *find.Limit)
+		if find.Offset != nil {
+			query = fmt.Sprintf("%s OFFSET %d", query, *find.Offset)
+		}
+	}
+
 	rows, err := d.db.QueryContext(ctx, query, args...)
 	if err != nil {
 		return nil, err

store/db/postgres/activity.go

@@ -2,8 +2,10 @@ package postgres
 
 import (
 	"context"
+	"fmt"
 	"strings"
 
+
 	"github.com/pkg/errors"
 	"google.golang.org/protobuf/encoding/protojson"
 
@@ -44,6 +46,13 @@ func (d *DB) ListActivities(ctx context.Context, find *store.FindActivity) ([]*s
 	}
 
 	query := "SELECT id, creator_id, type, level, payload, created_ts FROM activity WHERE " + strings.Join(where, " AND ") + " ORDER BY created_ts DESC"
+	if find.Limit != nil {
+		query = fmt.Sprintf("%s LIMIT %d", query, *find.Limit)
+		if find.Offset != nil {
+			query = fmt.Sprintf("%s OFFSET %d", query, *find.Offset)
+		}
+	}
+
 	rows, err := d.db.QueryContext(ctx, query, args...)
 	if err != nil {
 		return nil, err

store/db/sqlite/activity.go

@@ -2,8 +2,10 @@ package sqlite
 
 import (
 	"context"
+	"fmt"
 	"strings"
 
+
 	"github.com/pkg/errors"
 	"google.golang.org/protobuf/encoding/protojson"
 
@@ -46,6 +48,13 @@ func (d *DB) ListActivities(ctx context.Context, find *store.FindActivity) ([]*s
 	}
 
 	query := "SELECT `id`, `creator_id`, `type`, `level`, `payload`, `created_ts` FROM `activity` WHERE " + strings.Join(where, " AND ") + " ORDER BY `created_ts` DESC"
+	if find.Limit != nil {
+		query = fmt.Sprintf("%s LIMIT %d", query, *find.Limit)
+		if find.Offset != nil {
+			query = fmt.Sprintf("%s OFFSET %d", query, *find.Offset)
+		}
+	}
+
 	rows, err := d.db.QueryContext(ctx, query, args...)
 	if err != nil {
 		return nil, err