Move some files into models' sub packages (#20262)

* Move some files into models' sub packages

* Move functions

* merge main branch

* Fix check

* fix check

* Fix some tests

* Fix lint

* Fix lint

* Revert lint changes

* Fix error comments

* Fix lint

Co-authored-by: 6543 <6543@obermui.de>

10 files changed, 2621 insertions, 0 deletions

diff --git a/models/activities/action.go b/models/activities/action.go
new file mode 100644
index 0000000000..78a519e9a7
--- /dev/null
+++ b/models/activities/action.go
@@ -0,0 +1,610 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activities
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"path"
+	"strconv"
+	"strings"
+	"time"
+
+	"code.gitea.io/gitea/models/db"
+	issues_model "code.gitea.io/gitea/models/issues"
+	"code.gitea.io/gitea/models/organization"
+	access_model "code.gitea.io/gitea/models/perm/access"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unit"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
+
+	"xorm.io/builder"
+	"xorm.io/xorm/schemas"
+)
+
+// ActionType represents the type of an action.
+type ActionType int
+
+// Possible action types.
+const (
+	ActionCreateRepo                ActionType = iota + 1 // 1
+	ActionRenameRepo                                      // 2
+	ActionStarRepo                                        // 3
+	ActionWatchRepo                                       // 4
+	ActionCommitRepo                                      // 5
+	ActionCreateIssue                                     // 6
+	ActionCreatePullRequest                               // 7
+	ActionTransferRepo                                    // 8
+	ActionPushTag                                         // 9
+	ActionCommentIssue                                    // 10
+	ActionMergePullRequest                                // 11
+	ActionCloseIssue                                      // 12
+	ActionReopenIssue                                     // 13
+	ActionClosePullRequest                                // 14
+	ActionReopenPullRequest                               // 15
+	ActionDeleteTag                                       // 16
+	ActionDeleteBranch                                    // 17
+	ActionMirrorSyncPush                                  // 18
+	ActionMirrorSyncCreate                                // 19
+	ActionMirrorSyncDelete                                // 20
+	ActionApprovePullRequest                              // 21
+	ActionRejectPullRequest                               // 22
+	ActionCommentPull                                     // 23
+	ActionPublishRelease                                  // 24
+	ActionPullReviewDismissed                             // 25
+	ActionPullRequestReadyForReview                       // 26
+)
+
+// Action represents user operation type and other information to
+// repository. It implemented interface base.Actioner so that can be
+// used in template render.
+type Action struct {
+	ID          int64 `xorm:"pk autoincr"`
+	UserID      int64 // Receiver user id.
+	OpType      ActionType
+	ActUserID   int64            // Action user id.
+	ActUser     *user_model.User `xorm:"-"`
+	RepoID      int64
+	Repo        *repo_model.Repository `xorm:"-"`
+	CommentID   int64                  `xorm:"INDEX"`
+	Comment     *issues_model.Comment  `xorm:"-"`
+	IsDeleted   bool                   `xorm:"NOT NULL DEFAULT false"`
+	RefName     string
+	IsPrivate   bool               `xorm:"NOT NULL DEFAULT false"`
+	Content     string             `xorm:"TEXT"`
+	CreatedUnix timeutil.TimeStamp `xorm:"created"`
+}
+
+func init() {
+	db.RegisterModel(new(Action))
+}
+
+// TableIndices implements xorm's TableIndices interface
+func (a *Action) TableIndices() []*schemas.Index {
+	repoIndex := schemas.NewIndex("r_u_d", schemas.IndexType)
+	repoIndex.AddColumn("repo_id", "user_id", "is_deleted")
+
+	actUserIndex := schemas.NewIndex("au_r_c_u_d", schemas.IndexType)
+	actUserIndex.AddColumn("act_user_id", "repo_id", "created_unix", "user_id", "is_deleted")
+
+	return []*schemas.Index{actUserIndex, repoIndex}
+}
+
+// GetOpType gets the ActionType of this action.
+func (a *Action) GetOpType() ActionType {
+	return a.OpType
+}
+
+// LoadActUser loads a.ActUser
+func (a *Action) LoadActUser() {
+	if a.ActUser != nil {
+		return
+	}
+	var err error
+	a.ActUser, err = user_model.GetUserByID(a.ActUserID)
+	if err == nil {
+		return
+	} else if user_model.IsErrUserNotExist(err) {
+		a.ActUser = user_model.NewGhostUser()
+	} else {
+		log.Error("GetUserByID(%d): %v", a.ActUserID, err)
+	}
+}
+
+func (a *Action) loadRepo() {
+	if a.Repo != nil {
+		return
+	}
+	var err error
+	a.Repo, err = repo_model.GetRepositoryByID(a.RepoID)
+	if err != nil {
+		log.Error("repo_model.GetRepositoryByID(%d): %v", a.RepoID, err)
+	}
+}
+
+// GetActFullName gets the action's user full name.
+func (a *Action) GetActFullName() string {
+	a.LoadActUser()
+	return a.ActUser.FullName
+}
+
+// GetActUserName gets the action's user name.
+func (a *Action) GetActUserName() string {
+	a.LoadActUser()
+	return a.ActUser.Name
+}
+
+// ShortActUserName gets the action's user name trimmed to max 20
+// chars.
+func (a *Action) ShortActUserName() string {
+	return base.EllipsisString(a.GetActUserName(), 20)
+}
+
+// GetDisplayName gets the action's display name based on DEFAULT_SHOW_FULL_NAME, or falls back to the username if it is blank.
+func (a *Action) GetDisplayName() string {
+	if setting.UI.DefaultShowFullName {
+		trimmedFullName := strings.TrimSpace(a.GetActFullName())
+		if len(trimmedFullName) > 0 {
+			return trimmedFullName
+		}
+	}
+	return a.ShortActUserName()
+}
+
+// GetDisplayNameTitle gets the action's display name used for the title (tooltip) based on DEFAULT_SHOW_FULL_NAME
+func (a *Action) GetDisplayNameTitle() string {
+	if setting.UI.DefaultShowFullName {
+		return a.ShortActUserName()
+	}
+	return a.GetActFullName()
+}
+
+// GetRepoUserName returns the name of the action repository owner.
+func (a *Action) GetRepoUserName() string {
+	a.loadRepo()
+	return a.Repo.OwnerName
+}
+
+// ShortRepoUserName returns the name of the action repository owner
+// trimmed to max 20 chars.
+func (a *Action) ShortRepoUserName() string {
+	return base.EllipsisString(a.GetRepoUserName(), 20)
+}
+
+// GetRepoName returns the name of the action repository.
+func (a *Action) GetRepoName() string {
+	a.loadRepo()
+	return a.Repo.Name
+}
+
+// ShortRepoName returns the name of the action repository
+// trimmed to max 33 chars.
+func (a *Action) ShortRepoName() string {
+	return base.EllipsisString(a.GetRepoName(), 33)
+}
+
+// GetRepoPath returns the virtual path to the action repository.
+func (a *Action) GetRepoPath() string {
+	return path.Join(a.GetRepoUserName(), a.GetRepoName())
+}
+
+// ShortRepoPath returns the virtual path to the action repository
+// trimmed to max 20 + 1 + 33 chars.
+func (a *Action) ShortRepoPath() string {
+	return path.Join(a.ShortRepoUserName(), a.ShortRepoName())
+}
+
+// GetRepoLink returns relative link to action repository.
+func (a *Action) GetRepoLink() string {
+	// path.Join will skip empty strings
+	return path.Join(setting.AppSubURL, "/", url.PathEscape(a.GetRepoUserName()), url.PathEscape(a.GetRepoName()))
+}
+
+// GetCommentLink returns link to action comment.
+func (a *Action) GetCommentLink() string {
+	return a.getCommentLink(db.DefaultContext)
+}
+
+func (a *Action) getCommentLink(ctx context.Context) string {
+	if a == nil {
+		return "#"
+	}
+	if a.Comment == nil && a.CommentID != 0 {
+		a.Comment, _ = issues_model.GetCommentByID(ctx, a.CommentID)
+	}
+	if a.Comment != nil {
+		return a.Comment.HTMLURL()
+	}
+	if len(a.GetIssueInfos()) == 0 {
+		return "#"
+	}
+	// Return link to issue
+	issueIDString := a.GetIssueInfos()[0]
+	issueID, err := strconv.ParseInt(issueIDString, 10, 64)
+	if err != nil {
+		return "#"
+	}
+
+	issue, err := issues_model.GetIssueByID(ctx, issueID)
+	if err != nil {
+		return "#"
+	}
+
+	if err = issue.LoadRepo(ctx); err != nil {
+		return "#"
+	}
+
+	return issue.HTMLURL()
+}
+
+// GetBranch returns the action's repository branch.
+func (a *Action) GetBranch() string {
+	return strings.TrimPrefix(a.RefName, git.BranchPrefix)
+}
+
+// GetRefLink returns the action's ref link.
+func (a *Action) GetRefLink() string {
+	switch {
+	case strings.HasPrefix(a.RefName, git.BranchPrefix):
+		return a.GetRepoLink() + "/src/branch/" + util.PathEscapeSegments(strings.TrimPrefix(a.RefName, git.BranchPrefix))
+	case strings.HasPrefix(a.RefName, git.TagPrefix):
+		return a.GetRepoLink() + "/src/tag/" + util.PathEscapeSegments(strings.TrimPrefix(a.RefName, git.TagPrefix))
+	case len(a.RefName) == 40 && git.SHAPattern.MatchString(a.RefName):
+		return a.GetRepoLink() + "/src/commit/" + a.RefName
+	default:
+		// FIXME: we will just assume it's a branch - this was the old way - at some point we may want to enforce that there is always a ref here.
+		return a.GetRepoLink() + "/src/branch/" + util.PathEscapeSegments(strings.TrimPrefix(a.RefName, git.BranchPrefix))
+	}
+}
+
+// GetTag returns the action's repository tag.
+func (a *Action) GetTag() string {
+	return strings.TrimPrefix(a.RefName, git.TagPrefix)
+}
+
+// GetContent returns the action's content.
+func (a *Action) GetContent() string {
+	return a.Content
+}
+
+// GetCreate returns the action creation time.
+func (a *Action) GetCreate() time.Time {
+	return a.CreatedUnix.AsTime()
+}
+
+// GetIssueInfos returns a list of issues associated with
+// the action.
+func (a *Action) GetIssueInfos() []string {
+	return strings.SplitN(a.Content, "|", 3)
+}
+
+// GetIssueTitle returns the title of first issue associated
+// with the action.
+func (a *Action) GetIssueTitle() string {
+	index, _ := strconv.ParseInt(a.GetIssueInfos()[0], 10, 64)
+	issue, err := issues_model.GetIssueByIndex(a.RepoID, index)
+	if err != nil {
+		log.Error("GetIssueByIndex: %v", err)
+		return "500 when get issue"
+	}
+	return issue.Title
+}
+
+// GetIssueContent returns the content of first issue associated with
+// this action.
+func (a *Action) GetIssueContent() string {
+	index, _ := strconv.ParseInt(a.GetIssueInfos()[0], 10, 64)
+	issue, err := issues_model.GetIssueByIndex(a.RepoID, index)
+	if err != nil {
+		log.Error("GetIssueByIndex: %v", err)
+		return "500 when get issue"
+	}
+	return issue.Content
+}
+
+// GetFeedsOptions options for retrieving feeds
+type GetFeedsOptions struct {
+	db.ListOptions
+	RequestedUser   *user_model.User       // the user we want activity for
+	RequestedTeam   *organization.Team     // the team we want activity for
+	RequestedRepo   *repo_model.Repository // the repo we want activity for
+	Actor           *user_model.User       // the user viewing the activity
+	IncludePrivate  bool                   // include private actions
+	OnlyPerformedBy bool                   // only actions performed by requested user
+	IncludeDeleted  bool                   // include deleted actions
+	Date            string                 // the day we want activity for: YYYY-MM-DD
+}
+
+// GetFeeds returns actions according to the provided options
+func GetFeeds(ctx context.Context, opts GetFeedsOptions) (ActionList, error) {
+	if opts.RequestedUser == nil && opts.RequestedTeam == nil && opts.RequestedRepo == nil {
+		return nil, fmt.Errorf("need at least one of these filters: RequestedUser, RequestedTeam, RequestedRepo")
+	}
+
+	cond, err := activityQueryCondition(opts)
+	if err != nil {
+		return nil, err
+	}
+
+	sess := db.GetEngine(ctx).Where(cond).
+		Select("`action`.*"). // this line will avoid select other joined table's columns
+		Join("INNER", "repository", "`repository`.id = `action`.repo_id")
+
+	opts.SetDefaultValues()
+	sess = db.SetSessionPagination(sess, &opts)
+
+	actions := make([]*Action, 0, opts.PageSize)
+
+	if err := sess.Desc("`action`.created_unix").Find(&actions); err != nil {
+		return nil, fmt.Errorf("Find: %v", err)
+	}
+
+	if err := ActionList(actions).loadAttributes(ctx); err != nil {
+		return nil, fmt.Errorf("LoadAttributes: %v", err)
+	}
+
+	return actions, nil
+}
+
+// ActivityReadable return whether doer can read activities of user
+func ActivityReadable(user, doer *user_model.User) bool {
+	return !user.KeepActivityPrivate ||
+		doer != nil && (doer.IsAdmin || user.ID == doer.ID)
+}
+
+func activityQueryCondition(opts GetFeedsOptions) (builder.Cond, error) {
+	cond := builder.NewCond()
+
+	if opts.RequestedTeam != nil && opts.RequestedUser == nil {
+		org, err := user_model.GetUserByID(opts.RequestedTeam.OrgID)
+		if err != nil {
+			return nil, err
+		}
+		opts.RequestedUser = org
+	}
+
+	// check activity visibility for actor ( similar to activityReadable() )
+	if opts.Actor == nil {
+		cond = cond.And(builder.In("act_user_id",
+			builder.Select("`user`.id").Where(
+				builder.Eq{"keep_activity_private": false, "visibility": structs.VisibleTypePublic},
+			).From("`user`"),
+		))
+	} else if !opts.Actor.IsAdmin {
+		cond = cond.And(builder.In("act_user_id",
+			builder.Select("`user`.id").Where(
+				builder.Eq{"keep_activity_private": false}.
+					And(builder.In("visibility", structs.VisibleTypePublic, structs.VisibleTypeLimited))).
+				Or(builder.Eq{"id": opts.Actor.ID}).From("`user`"),
+		))
+	}
+
+	// check readable repositories by doer/actor
+	if opts.Actor == nil || !opts.Actor.IsAdmin {
+		cond = cond.And(builder.In("repo_id", repo_model.AccessibleRepoIDsQuery(opts.Actor)))
+	}
+
+	if opts.RequestedRepo != nil {
+		cond = cond.And(builder.Eq{"repo_id": opts.RequestedRepo.ID})
+	}
+
+	if opts.RequestedTeam != nil {
+		env := organization.OrgFromUser(opts.RequestedUser).AccessibleTeamReposEnv(opts.RequestedTeam)
+		teamRepoIDs, err := env.RepoIDs(1, opts.RequestedUser.NumRepos)
+		if err != nil {
+			return nil, fmt.Errorf("GetTeamRepositories: %v", err)
+		}
+		cond = cond.And(builder.In("repo_id", teamRepoIDs))
+	}
+
+	if opts.RequestedUser != nil {
+		cond = cond.And(builder.Eq{"user_id": opts.RequestedUser.ID})
+
+		if opts.OnlyPerformedBy {
+			cond = cond.And(builder.Eq{"act_user_id": opts.RequestedUser.ID})
+		}
+	}
+
+	if !opts.IncludePrivate {
+		cond = cond.And(builder.Eq{"`action`.is_private": false})
+	}
+	if !opts.IncludeDeleted {
+		cond = cond.And(builder.Eq{"is_deleted": false})
+	}
+
+	if opts.Date != "" {
+		dateLow, err := time.ParseInLocation("2006-01-02", opts.Date, setting.DefaultUILocation)
+		if err != nil {
+			log.Warn("Unable to parse %s, filter not applied: %v", opts.Date, err)
+		} else {
+			dateHigh := dateLow.Add(86399000000000) // 23h59m59s
+
+			cond = cond.And(builder.Gte{"`action`.created_unix": dateLow.Unix()})
+			cond = cond.And(builder.Lte{"`action`.created_unix": dateHigh.Unix()})
+		}
+	}
+
+	return cond, nil
+}
+
+// DeleteOldActions deletes all old actions from database.
+func DeleteOldActions(olderThan time.Duration) (err error) {
+	if olderThan <= 0 {
+		return nil
+	}
+
+	_, err = db.GetEngine(db.DefaultContext).Where("created_unix < ?", time.Now().Add(-olderThan).Unix()).Delete(&Action{})
+	return err
+}
+
+func notifyWatchers(ctx context.Context, actions ...*Action) error {
+	var watchers []*repo_model.Watch
+	var repo *repo_model.Repository
+	var err error
+	var permCode []bool
+	var permIssue []bool
+	var permPR []bool
+
+	e := db.GetEngine(ctx)
+
+	for _, act := range actions {
+		repoChanged := repo == nil || repo.ID != act.RepoID
+
+		if repoChanged {
+			// Add feeds for user self and all watchers.
+			watchers, err = repo_model.GetWatchers(ctx, act.RepoID)
+			if err != nil {
+				return fmt.Errorf("get watchers: %v", err)
+			}
+		}
+
+		// Add feed for actioner.
+		act.UserID = act.ActUserID
+		if _, err = e.Insert(act); err != nil {
+			return fmt.Errorf("insert new actioner: %v", err)
+		}
+
+		if repoChanged {
+			act.loadRepo()
+			repo = act.Repo
+
+			// check repo owner exist.
+			if err := act.Repo.GetOwner(ctx); err != nil {
+				return fmt.Errorf("can't get repo owner: %v", err)
+			}
+		} else if act.Repo == nil {
+			act.Repo = repo
+		}
+
+		// Add feed for organization
+		if act.Repo.Owner.IsOrganization() && act.ActUserID != act.Repo.Owner.ID {
+			act.ID = 0
+			act.UserID = act.Repo.Owner.ID
+			if err = db.Insert(ctx, act); err != nil {
+				return fmt.Errorf("insert new actioner: %v", err)
+			}
+		}
+
+		if repoChanged {
+			permCode = make([]bool, len(watchers))
+			permIssue = make([]bool, len(watchers))
+			permPR = make([]bool, len(watchers))
+			for i, watcher := range watchers {
+				user, err := user_model.GetUserByIDCtx(ctx, watcher.UserID)
+				if err != nil {
+					permCode[i] = false
+					permIssue[i] = false
+					permPR[i] = false
+					continue
+				}
+				perm, err := access_model.GetUserRepoPermission(ctx, repo, user)
+				if err != nil {
+					permCode[i] = false
+					permIssue[i] = false
+					permPR[i] = false
+					continue
+				}
+				permCode[i] = perm.CanRead(unit.TypeCode)
+				permIssue[i] = perm.CanRead(unit.TypeIssues)
+				permPR[i] = perm.CanRead(unit.TypePullRequests)
+			}
+		}
+
+		for i, watcher := range watchers {
+			if act.ActUserID == watcher.UserID {
+				continue
+			}
+			act.ID = 0
+			act.UserID = watcher.UserID
+			act.Repo.Units = nil
+
+			switch act.OpType {
+			case ActionCommitRepo, ActionPushTag, ActionDeleteTag, ActionPublishRelease, ActionDeleteBranch:
+				if !permCode[i] {
+					continue
+				}
+			case ActionCreateIssue, ActionCommentIssue, ActionCloseIssue, ActionReopenIssue:
+				if !permIssue[i] {
+					continue
+				}
+			case ActionCreatePullRequest, ActionCommentPull, ActionMergePullRequest, ActionClosePullRequest, ActionReopenPullRequest:
+				if !permPR[i] {
+					continue
+				}
+			}
+
+			if err = db.Insert(ctx, act); err != nil {
+				return fmt.Errorf("insert new action: %v", err)
+			}
+		}
+	}
+	return nil
+}
+
+// NotifyWatchers creates batch of actions for every watcher.
+func NotifyWatchers(actions ...*Action) error {
+	return notifyWatchers(db.DefaultContext, actions...)
+}
+
+// NotifyWatchersActions creates batch of actions for every watcher.
+func NotifyWatchersActions(acts []*Action) error {
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+	for _, act := range acts {
+		if err := notifyWatchers(ctx, act); err != nil {
+			return err
+		}
+	}
+	return committer.Commit()
+}
+
+// DeleteIssueActions delete all actions related with issueID
+func DeleteIssueActions(ctx context.Context, repoID, issueID int64) error {
+	// delete actions assigned to this issue
+	subQuery := builder.Select("`id`").
+		From("`comment`").
+		Where(builder.Eq{"`issue_id`": issueID})
+	if _, err := db.GetEngine(ctx).In("comment_id", subQuery).Delete(&Action{}); err != nil {
+		return err
+	}
+
+	_, err := db.GetEngine(ctx).Table("action").Where("repo_id = ?", repoID).
+		In("op_type", ActionCreateIssue, ActionCreatePullRequest).
+		Where("content LIKE ?", strconv.FormatInt(issueID, 10)+"|%").
+		Delete(&Action{})
+	return err
+}
+
+// CountActionCreatedUnixString count actions where created_unix is an empty string
+func CountActionCreatedUnixString() (int64, error) {
+	if setting.Database.UseSQLite3 {
+		return db.GetEngine(db.DefaultContext).Where(`created_unix = ""`).Count(new(Action))
+	}
+	return 0, nil
+}
+
+// FixActionCreatedUnixString set created_unix to zero if it is an empty string
+func FixActionCreatedUnixString() (int64, error) {
+	if setting.Database.UseSQLite3 {
+		res, err := db.GetEngine(db.DefaultContext).Exec(`UPDATE action SET created_unix = 0 WHERE created_unix = ""`)
+		if err != nil {
+			return 0, err
+		}
+		return res.RowsAffected()
+	}
+	return 0, nil
+}
diff --git a/models/activities/action_list.go b/models/activities/action_list.go
new file mode 100644
index 0000000000..16fb4bac8c
--- /dev/null
+++ b/models/activities/action_list.go
@@ -0,0 +1,116 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activities
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
+)
+
+// ActionList defines a list of actions
+type ActionList []*Action
+
+func (actions ActionList) getUserIDs() []int64 {
+	userIDs := make(map[int64]struct{}, len(actions))
+	for _, action := range actions {
+		if _, ok := userIDs[action.ActUserID]; !ok {
+			userIDs[action.ActUserID] = struct{}{}
+		}
+	}
+	return container.KeysInt64(userIDs)
+}
+
+func (actions ActionList) loadUsers(ctx context.Context) (map[int64]*user_model.User, error) {
+	if len(actions) == 0 {
+		return nil, nil
+	}
+
+	userIDs := actions.getUserIDs()
+	userMaps := make(map[int64]*user_model.User, len(userIDs))
+	err := db.GetEngine(ctx).
+		In("id", userIDs).
+		Find(&userMaps)
+	if err != nil {
+		return nil, fmt.Errorf("find user: %v", err)
+	}
+
+	for _, action := range actions {
+		action.ActUser = userMaps[action.ActUserID]
+	}
+	return userMaps, nil
+}
+
+func (actions ActionList) getRepoIDs() []int64 {
+	repoIDs := make(map[int64]struct{}, len(actions))
+	for _, action := range actions {
+		if _, ok := repoIDs[action.RepoID]; !ok {
+			repoIDs[action.RepoID] = struct{}{}
+		}
+	}
+	return container.KeysInt64(repoIDs)
+}
+
+func (actions ActionList) loadRepositories(ctx context.Context) error {
+	if len(actions) == 0 {
+		return nil
+	}
+
+	repoIDs := actions.getRepoIDs()
+	repoMaps := make(map[int64]*repo_model.Repository, len(repoIDs))
+	err := db.GetEngine(ctx).In("id", repoIDs).Find(&repoMaps)
+	if err != nil {
+		return fmt.Errorf("find repository: %v", err)
+	}
+
+	for _, action := range actions {
+		action.Repo = repoMaps[action.RepoID]
+	}
+	return nil
+}
+
+func (actions ActionList) loadRepoOwner(ctx context.Context, userMap map[int64]*user_model.User) (err error) {
+	if userMap == nil {
+		userMap = make(map[int64]*user_model.User)
+	}
+
+	for _, action := range actions {
+		if action.Repo == nil {
+			continue
+		}
+		repoOwner, ok := userMap[action.Repo.OwnerID]
+		if !ok {
+			repoOwner, err = user_model.GetUserByIDCtx(ctx, action.Repo.OwnerID)
+			if err != nil {
+				if user_model.IsErrUserNotExist(err) {
+					continue
+				}
+				return err
+			}
+			userMap[repoOwner.ID] = repoOwner
+		}
+		action.Repo.Owner = repoOwner
+	}
+
+	return nil
+}
+
+// loadAttributes loads all attributes
+func (actions ActionList) loadAttributes(ctx context.Context) error {
+	userMap, err := actions.loadUsers(ctx)
+	if err != nil {
+		return err
+	}
+
+	if err := actions.loadRepositories(ctx); err != nil {
+		return err
+	}
+
+	return actions.loadRepoOwner(ctx, userMap)
+}
diff --git a/models/activities/action_test.go b/models/activities/action_test.go
new file mode 100644
index 0000000000..83fd9ee38d
--- /dev/null
+++ b/models/activities/action_test.go
@@ -0,0 +1,274 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activities_test
+
+import (
+	"path"
+	"testing"
+
+	activities_model "code.gitea.io/gitea/models/activities"
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAction_GetRepoPath(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{})
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
+	action := &activities_model.Action{RepoID: repo.ID}
+	assert.Equal(t, path.Join(owner.Name, repo.Name), action.GetRepoPath())
+}
+
+func TestAction_GetRepoLink(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{})
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
+	action := &activities_model.Action{RepoID: repo.ID}
+	setting.AppSubURL = "/suburl"
+	expected := path.Join(setting.AppSubURL, owner.Name, repo.Name)
+	assert.Equal(t, expected, action.GetRepoLink())
+}
+
+func TestGetFeeds(t *testing.T) {
+	// test with an individual user
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+	actions, err := activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+		RequestedUser:   user,
+		Actor:           user,
+		IncludePrivate:  true,
+		OnlyPerformedBy: false,
+		IncludeDeleted:  true,
+	})
+	assert.NoError(t, err)
+	if assert.Len(t, actions, 1) {
+		assert.EqualValues(t, 1, actions[0].ID)
+		assert.EqualValues(t, user.ID, actions[0].UserID)
+	}
+
+	actions, err = activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+		RequestedUser:   user,
+		Actor:           user,
+		IncludePrivate:  false,
+		OnlyPerformedBy: false,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, actions, 0)
+}
+
+func TestGetFeedsForRepos(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	privRepo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 2})
+	pubRepo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 8})
+
+	// private repo & no login
+	actions, err := activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+		RequestedRepo:  privRepo,
+		IncludePrivate: true,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, actions, 0)
+
+	// public repo & no login
+	actions, err = activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+		RequestedRepo:  pubRepo,
+		IncludePrivate: true,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, actions, 1)
+
+	// private repo and login
+	actions, err = activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+		RequestedRepo:  privRepo,
+		IncludePrivate: true,
+		Actor:          user,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, actions, 1)
+
+	// public repo & login
+	actions, err = activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+		RequestedRepo:  pubRepo,
+		IncludePrivate: true,
+		Actor:          user,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, actions, 1)
+}
+
+func TestGetFeeds2(t *testing.T) {
+	// test with an organization user
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	org := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 3})
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+	actions, err := activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+		RequestedUser:   org,
+		Actor:           user,
+		IncludePrivate:  true,
+		OnlyPerformedBy: false,
+		IncludeDeleted:  true,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, actions, 1)
+	if assert.Len(t, actions, 1) {
+		assert.EqualValues(t, 2, actions[0].ID)
+		assert.EqualValues(t, org.ID, actions[0].UserID)
+	}
+
+	actions, err = activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+		RequestedUser:   org,
+		Actor:           user,
+		IncludePrivate:  false,
+		OnlyPerformedBy: false,
+		IncludeDeleted:  true,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, actions, 0)
+}
+
+func TestActivityReadable(t *testing.T) {
+	tt := []struct {
+		desc   string
+		user   *user_model.User
+		doer   *user_model.User
+		result bool
+	}{{
+		desc:   "user should see own activity",
+		user:   &user_model.User{ID: 1},
+		doer:   &user_model.User{ID: 1},
+		result: true,
+	}, {
+		desc:   "anon should see activity if public",
+		user:   &user_model.User{ID: 1},
+		result: true,
+	}, {
+		desc:   "anon should NOT see activity",
+		user:   &user_model.User{ID: 1, KeepActivityPrivate: true},
+		result: false,
+	}, {
+		desc:   "user should see own activity if private too",
+		user:   &user_model.User{ID: 1, KeepActivityPrivate: true},
+		doer:   &user_model.User{ID: 1},
+		result: true,
+	}, {
+		desc:   "other user should NOT see activity",
+		user:   &user_model.User{ID: 1, KeepActivityPrivate: true},
+		doer:   &user_model.User{ID: 2},
+		result: false,
+	}, {
+		desc:   "admin should see activity",
+		user:   &user_model.User{ID: 1, KeepActivityPrivate: true},
+		doer:   &user_model.User{ID: 2, IsAdmin: true},
+		result: true,
+	}}
+	for _, test := range tt {
+		assert.Equal(t, test.result, activities_model.ActivityReadable(test.user, test.doer), test.desc)
+	}
+}
+
+func TestNotifyWatchers(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	action := &activities_model.Action{
+		ActUserID: 8,
+		RepoID:    1,
+		OpType:    activities_model.ActionStarRepo,
+	}
+	assert.NoError(t, activities_model.NotifyWatchers(action))
+
+	// One watchers are inactive, thus action is only created for user 8, 1, 4, 11
+	unittest.AssertExistsAndLoadBean(t, &activities_model.Action{
+		ActUserID: action.ActUserID,
+		UserID:    8,
+		RepoID:    action.RepoID,
+		OpType:    action.OpType,
+	})
+	unittest.AssertExistsAndLoadBean(t, &activities_model.Action{
+		ActUserID: action.ActUserID,
+		UserID:    1,
+		RepoID:    action.RepoID,
+		OpType:    action.OpType,
+	})
+	unittest.AssertExistsAndLoadBean(t, &activities_model.Action{
+		ActUserID: action.ActUserID,
+		UserID:    4,
+		RepoID:    action.RepoID,
+		OpType:    action.OpType,
+	})
+	unittest.AssertExistsAndLoadBean(t, &activities_model.Action{
+		ActUserID: action.ActUserID,
+		UserID:    11,
+		RepoID:    action.RepoID,
+		OpType:    action.OpType,
+	})
+}
+
+func TestGetFeedsCorrupted(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+	unittest.AssertExistsAndLoadBean(t, &activities_model.Action{
+		ID:     8,
+		RepoID: 1700,
+	})
+
+	actions, err := activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+		RequestedUser:  user,
+		Actor:          user,
+		IncludePrivate: true,
+	})
+	assert.NoError(t, err)
+	assert.Len(t, actions, 0)
+}
+
+func TestConsistencyUpdateAction(t *testing.T) {
+	if !setting.Database.UseSQLite3 {
+		t.Skip("Test is only for SQLite database.")
+	}
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	id := 8
+	unittest.AssertExistsAndLoadBean(t, &activities_model.Action{
+		ID: int64(id),
+	})
+	_, err := db.GetEngine(db.DefaultContext).Exec(`UPDATE action SET created_unix = "" WHERE id = ?`, id)
+	assert.NoError(t, err)
+	actions := make([]*activities_model.Action, 0, 1)
+	//
+	// XORM returns an error when created_unix is a string
+	//
+	err = db.GetEngine(db.DefaultContext).Where("id = ?", id).Find(&actions)
+	if assert.Error(t, err) {
+		assert.Contains(t, err.Error(), "type string to a int64: invalid syntax")
+	}
+	//
+	// Get rid of incorrectly set created_unix
+	//
+	count, err := activities_model.CountActionCreatedUnixString()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, count)
+	count, err = activities_model.FixActionCreatedUnixString()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, count)
+
+	count, err = activities_model.CountActionCreatedUnixString()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 0, count)
+	count, err = activities_model.FixActionCreatedUnixString()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 0, count)
+
+	//
+	// XORM must be happy now
+	//
+	assert.NoError(t, db.GetEngine(db.DefaultContext).Where("id = ?", id).Find(&actions))
+	unittest.CheckConsistencyFor(t, &activities_model.Action{})
+}
diff --git a/models/activities/main_test.go b/models/activities/main_test.go
new file mode 100644
index 0000000000..0a87f47600
--- /dev/null
+++ b/models/activities/main_test.go
@@ -0,0 +1,20 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activities_test
+
+import (
+	"path/filepath"
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+
+	_ "code.gitea.io/gitea/models"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m, &unittest.TestOptions{
+		GiteaRootPath: filepath.Join("..", ".."),
+	})
+}
diff --git a/models/activities/notification.go b/models/activities/notification.go
new file mode 100644
index 0000000000..88776db42b
--- /dev/null
+++ b/models/activities/notification.go
@@ -0,0 +1,835 @@
+// Copyright 2016 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activities
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"strconv"
+
+	"code.gitea.io/gitea/models/db"
+	issues_model "code.gitea.io/gitea/models/issues"
+	"code.gitea.io/gitea/models/organization"
+	access_model "code.gitea.io/gitea/models/perm/access"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unit"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/container"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"xorm.io/builder"
+	"xorm.io/xorm"
+)
+
+type (
+	// NotificationStatus is the status of the notification (read or unread)
+	NotificationStatus uint8
+	// NotificationSource is the source of the notification (issue, PR, commit, etc)
+	NotificationSource uint8
+)
+
+const (
+	// NotificationStatusUnread represents an unread notification
+	NotificationStatusUnread NotificationStatus = iota + 1
+	// NotificationStatusRead represents a read notification
+	NotificationStatusRead
+	// NotificationStatusPinned represents a pinned notification
+	NotificationStatusPinned
+)
+
+const (
+	// NotificationSourceIssue is a notification of an issue
+	NotificationSourceIssue NotificationSource = iota + 1
+	// NotificationSourcePullRequest is a notification of a pull request
+	NotificationSourcePullRequest
+	// NotificationSourceCommit is a notification of a commit
+	NotificationSourceCommit
+	// NotificationSourceRepository is a notification for a repository
+	NotificationSourceRepository
+)
+
+// Notification represents a notification
+type Notification struct {
+	ID     int64 `xorm:"pk autoincr"`
+	UserID int64 `xorm:"INDEX NOT NULL"`
+	RepoID int64 `xorm:"INDEX NOT NULL"`
+
+	Status NotificationStatus `xorm:"SMALLINT INDEX NOT NULL"`
+	Source NotificationSource `xorm:"SMALLINT INDEX NOT NULL"`
+
+	IssueID   int64  `xorm:"INDEX NOT NULL"`
+	CommitID  string `xorm:"INDEX"`
+	CommentID int64
+
+	UpdatedBy int64 `xorm:"INDEX NOT NULL"`
+
+	Issue      *issues_model.Issue    `xorm:"-"`
+	Repository *repo_model.Repository `xorm:"-"`
+	Comment    *issues_model.Comment  `xorm:"-"`
+	User       *user_model.User       `xorm:"-"`
+
+	CreatedUnix timeutil.TimeStamp `xorm:"created INDEX NOT NULL"`
+	UpdatedUnix timeutil.TimeStamp `xorm:"updated INDEX NOT NULL"`
+}
+
+func init() {
+	db.RegisterModel(new(Notification))
+}
+
+// FindNotificationOptions represent the filters for notifications. If an ID is 0 it will be ignored.
+type FindNotificationOptions struct {
+	db.ListOptions
+	UserID            int64
+	RepoID            int64
+	IssueID           int64
+	Status            []NotificationStatus
+	Source            []NotificationSource
+	UpdatedAfterUnix  int64
+	UpdatedBeforeUnix int64
+}
+
+// ToCond will convert each condition into a xorm-Cond
+func (opts *FindNotificationOptions) ToCond() builder.Cond {
+	cond := builder.NewCond()
+	if opts.UserID != 0 {
+		cond = cond.And(builder.Eq{"notification.user_id": opts.UserID})
+	}
+	if opts.RepoID != 0 {
+		cond = cond.And(builder.Eq{"notification.repo_id": opts.RepoID})
+	}
+	if opts.IssueID != 0 {
+		cond = cond.And(builder.Eq{"notification.issue_id": opts.IssueID})
+	}
+	if len(opts.Status) > 0 {
+		cond = cond.And(builder.In("notification.status", opts.Status))
+	}
+	if len(opts.Source) > 0 {
+		cond = cond.And(builder.In("notification.source", opts.Source))
+	}
+	if opts.UpdatedAfterUnix != 0 {
+		cond = cond.And(builder.Gte{"notification.updated_unix": opts.UpdatedAfterUnix})
+	}
+	if opts.UpdatedBeforeUnix != 0 {
+		cond = cond.And(builder.Lte{"notification.updated_unix": opts.UpdatedBeforeUnix})
+	}
+	return cond
+}
+
+// ToSession will convert the given options to a xorm Session by using the conditions from ToCond and joining with issue table if required
+func (opts *FindNotificationOptions) ToSession(ctx context.Context) *xorm.Session {
+	sess := db.GetEngine(ctx).Where(opts.ToCond())
+	if opts.Page != 0 {
+		sess = db.SetSessionPagination(sess, opts)
+	}
+	return sess
+}
+
+// GetNotifications returns all notifications that fit to the given options.
+func GetNotifications(ctx context.Context, options *FindNotificationOptions) (nl NotificationList, err error) {
+	err = options.ToSession(ctx).OrderBy("notification.updated_unix DESC").Find(&nl)
+	return nl, err
+}
+
+// CountNotifications count all notifications that fit to the given options and ignore pagination.
+func CountNotifications(opts *FindNotificationOptions) (int64, error) {
+	return db.GetEngine(db.DefaultContext).Where(opts.ToCond()).Count(&Notification{})
+}
+
+// CreateRepoTransferNotification creates  notification for the user a repository was transferred to
+func CreateRepoTransferNotification(doer, newOwner *user_model.User, repo *repo_model.Repository) error {
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	var notify []*Notification
+
+	if newOwner.IsOrganization() {
+		users, err := organization.GetUsersWhoCanCreateOrgRepo(ctx, newOwner.ID)
+		if err != nil || len(users) == 0 {
+			return err
+		}
+		for i := range users {
+			notify = append(notify, &Notification{
+				UserID:    users[i].ID,
+				RepoID:    repo.ID,
+				Status:    NotificationStatusUnread,
+				UpdatedBy: doer.ID,
+				Source:    NotificationSourceRepository,
+			})
+		}
+	} else {
+		notify = []*Notification{{
+			UserID:    newOwner.ID,
+			RepoID:    repo.ID,
+			Status:    NotificationStatusUnread,
+			UpdatedBy: doer.ID,
+			Source:    NotificationSourceRepository,
+		}}
+	}
+
+	if err := db.Insert(ctx, notify); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}
+
+// CreateOrUpdateIssueNotifications creates an issue notification
+// for each watcher, or updates it if already exists
+// receiverID > 0 just send to receiver, else send to all watcher
+func CreateOrUpdateIssueNotifications(issueID, commentID, notificationAuthorID, receiverID int64) error {
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	if err := createOrUpdateIssueNotifications(ctx, issueID, commentID, notificationAuthorID, receiverID); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}
+
+func createOrUpdateIssueNotifications(ctx context.Context, issueID, commentID, notificationAuthorID, receiverID int64) error {
+	// init
+	var toNotify map[int64]struct{}
+	notifications, err := getNotificationsByIssueID(ctx, issueID)
+	if err != nil {
+		return err
+	}
+
+	issue, err := issues_model.GetIssueByID(ctx, issueID)
+	if err != nil {
+		return err
+	}
+
+	if receiverID > 0 {
+		toNotify = make(map[int64]struct{}, 1)
+		toNotify[receiverID] = struct{}{}
+	} else {
+		toNotify = make(map[int64]struct{}, 32)
+		issueWatches, err := issues_model.GetIssueWatchersIDs(ctx, issueID, true)
+		if err != nil {
+			return err
+		}
+		for _, id := range issueWatches {
+			toNotify[id] = struct{}{}
+		}
+		if !(issue.IsPull && issues_model.HasWorkInProgressPrefix(issue.Title)) {
+			repoWatches, err := repo_model.GetRepoWatchersIDs(ctx, issue.RepoID)
+			if err != nil {
+				return err
+			}
+			for _, id := range repoWatches {
+				toNotify[id] = struct{}{}
+			}
+		}
+		issueParticipants, err := issue.GetParticipantIDsByIssue(ctx)
+		if err != nil {
+			return err
+		}
+		for _, id := range issueParticipants {
+			toNotify[id] = struct{}{}
+		}
+
+		// dont notify user who cause notification
+		delete(toNotify, notificationAuthorID)
+		// explicit unwatch on issue
+		issueUnWatches, err := issues_model.GetIssueWatchersIDs(ctx, issueID, false)
+		if err != nil {
+			return err
+		}
+		for _, id := range issueUnWatches {
+			delete(toNotify, id)
+		}
+	}
+
+	err = issue.LoadRepo(ctx)
+	if err != nil {
+		return err
+	}
+
+	// notify
+	for userID := range toNotify {
+		issue.Repo.Units = nil
+		user, err := user_model.GetUserByIDCtx(ctx, userID)
+		if err != nil {
+			if user_model.IsErrUserNotExist(err) {
+				continue
+			}
+
+			return err
+		}
+		if issue.IsPull && !access_model.CheckRepoUnitUser(ctx, issue.Repo, user, unit.TypePullRequests) {
+			continue
+		}
+		if !issue.IsPull && !access_model.CheckRepoUnitUser(ctx, issue.Repo, user, unit.TypeIssues) {
+			continue
+		}
+
+		if notificationExists(notifications, issue.ID, userID) {
+			if err = updateIssueNotification(ctx, userID, issue.ID, commentID, notificationAuthorID); err != nil {
+				return err
+			}
+			continue
+		}
+		if err = createIssueNotification(ctx, userID, issue, commentID, notificationAuthorID); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func getNotificationsByIssueID(ctx context.Context, issueID int64) (notifications []*Notification, err error) {
+	err = db.GetEngine(ctx).
+		Where("issue_id = ?", issueID).
+		Find(&notifications)
+	return notifications, err
+}
+
+func notificationExists(notifications []*Notification, issueID, userID int64) bool {
+	for _, notification := range notifications {
+		if notification.IssueID == issueID && notification.UserID == userID {
+			return true
+		}
+	}
+
+	return false
+}
+
+func createIssueNotification(ctx context.Context, userID int64, issue *issues_model.Issue, commentID, updatedByID int64) error {
+	notification := &Notification{
+		UserID:    userID,
+		RepoID:    issue.RepoID,
+		Status:    NotificationStatusUnread,
+		IssueID:   issue.ID,
+		CommentID: commentID,
+		UpdatedBy: updatedByID,
+	}
+
+	if issue.IsPull {
+		notification.Source = NotificationSourcePullRequest
+	} else {
+		notification.Source = NotificationSourceIssue
+	}
+
+	return db.Insert(ctx, notification)
+}
+
+func updateIssueNotification(ctx context.Context, userID, issueID, commentID, updatedByID int64) error {
+	notification, err := getIssueNotification(ctx, userID, issueID)
+	if err != nil {
+		return err
+	}
+
+	// NOTICE: Only update comment id when the before notification on this issue is read, otherwise you may miss some old comments.
+	// But we need update update_by so that the notification will be reorder
+	var cols []string
+	if notification.Status == NotificationStatusRead {
+		notification.Status = NotificationStatusUnread
+		notification.CommentID = commentID
+		cols = []string{"status", "update_by", "comment_id"}
+	} else {
+		notification.UpdatedBy = updatedByID
+		cols = []string{"update_by"}
+	}
+
+	_, err = db.GetEngine(ctx).ID(notification.ID).Cols(cols...).Update(notification)
+	return err
+}
+
+func getIssueNotification(ctx context.Context, userID, issueID int64) (*Notification, error) {
+	notification := new(Notification)
+	_, err := db.GetEngine(ctx).
+		Where("user_id = ?", userID).
+		And("issue_id = ?", issueID).
+		Get(notification)
+	return notification, err
+}
+
+// NotificationsForUser returns notifications for a given user and status
+func NotificationsForUser(ctx context.Context, user *user_model.User, statuses []NotificationStatus, page, perPage int) (notifications NotificationList, err error) {
+	if len(statuses) == 0 {
+		return
+	}
+
+	sess := db.GetEngine(ctx).
+		Where("user_id = ?", user.ID).
+		In("status", statuses).
+		OrderBy("updated_unix DESC")
+
+	if page > 0 && perPage > 0 {
+		sess.Limit(perPage, (page-1)*perPage)
+	}
+
+	err = sess.Find(&notifications)
+	return notifications, err
+}
+
+// CountUnread count unread notifications for a user
+func CountUnread(ctx context.Context, userID int64) int64 {
+	exist, err := db.GetEngine(ctx).Where("user_id = ?", userID).And("status = ?", NotificationStatusUnread).Count(new(Notification))
+	if err != nil {
+		log.Error("countUnread", err)
+		return 0
+	}
+	return exist
+}
+
+// LoadAttributes load Repo Issue User and Comment if not loaded
+func (n *Notification) LoadAttributes() (err error) {
+	return n.loadAttributes(db.DefaultContext)
+}
+
+func (n *Notification) loadAttributes(ctx context.Context) (err error) {
+	if err = n.loadRepo(ctx); err != nil {
+		return
+	}
+	if err = n.loadIssue(ctx); err != nil {
+		return
+	}
+	if err = n.loadUser(ctx); err != nil {
+		return
+	}
+	if err = n.loadComment(ctx); err != nil {
+		return
+	}
+	return err
+}
+
+func (n *Notification) loadRepo(ctx context.Context) (err error) {
+	if n.Repository == nil {
+		n.Repository, err = repo_model.GetRepositoryByIDCtx(ctx, n.RepoID)
+		if err != nil {
+			return fmt.Errorf("getRepositoryByID [%d]: %v", n.RepoID, err)
+		}
+	}
+	return nil
+}
+
+func (n *Notification) loadIssue(ctx context.Context) (err error) {
+	if n.Issue == nil && n.IssueID != 0 {
+		n.Issue, err = issues_model.GetIssueByID(ctx, n.IssueID)
+		if err != nil {
+			return fmt.Errorf("getIssueByID [%d]: %v", n.IssueID, err)
+		}
+		return n.Issue.LoadAttributes(ctx)
+	}
+	return nil
+}
+
+func (n *Notification) loadComment(ctx context.Context) (err error) {
+	if n.Comment == nil && n.CommentID != 0 {
+		n.Comment, err = issues_model.GetCommentByID(ctx, n.CommentID)
+		if err != nil {
+			if issues_model.IsErrCommentNotExist(err) {
+				return issues_model.ErrCommentNotExist{
+					ID:      n.CommentID,
+					IssueID: n.IssueID,
+				}
+			}
+			return err
+		}
+	}
+	return nil
+}
+
+func (n *Notification) loadUser(ctx context.Context) (err error) {
+	if n.User == nil {
+		n.User, err = user_model.GetUserByIDCtx(ctx, n.UserID)
+		if err != nil {
+			return fmt.Errorf("getUserByID [%d]: %v", n.UserID, err)
+		}
+	}
+	return nil
+}
+
+// GetRepo returns the repo of the notification
+func (n *Notification) GetRepo() (*repo_model.Repository, error) {
+	return n.Repository, n.loadRepo(db.DefaultContext)
+}
+
+// GetIssue returns the issue of the notification
+func (n *Notification) GetIssue() (*issues_model.Issue, error) {
+	return n.Issue, n.loadIssue(db.DefaultContext)
+}
+
+// HTMLURL formats a URL-string to the notification
+func (n *Notification) HTMLURL() string {
+	switch n.Source {
+	case NotificationSourceIssue, NotificationSourcePullRequest:
+		if n.Comment != nil {
+			return n.Comment.HTMLURL()
+		}
+		return n.Issue.HTMLURL()
+	case NotificationSourceCommit:
+		return n.Repository.HTMLURL() + "/commit/" + url.PathEscape(n.CommitID)
+	case NotificationSourceRepository:
+		return n.Repository.HTMLURL()
+	}
+	return ""
+}
+
+// APIURL formats a URL-string to the notification
+func (n *Notification) APIURL() string {
+	return setting.AppURL + "api/v1/notifications/threads/" + strconv.FormatInt(n.ID, 10)
+}
+
+// NotificationList contains a list of notifications
+type NotificationList []*Notification
+
+// LoadAttributes load Repo Issue User and Comment if not loaded
+func (nl NotificationList) LoadAttributes() error {
+	var err error
+	for i := 0; i < len(nl); i++ {
+		err = nl[i].LoadAttributes()
+		if err != nil && !issues_model.IsErrCommentNotExist(err) {
+			return err
+		}
+	}
+	return nil
+}
+
+func (nl NotificationList) getPendingRepoIDs() []int64 {
+	ids := make(map[int64]struct{}, len(nl))
+	for _, notification := range nl {
+		if notification.Repository != nil {
+			continue
+		}
+		if _, ok := ids[notification.RepoID]; !ok {
+			ids[notification.RepoID] = struct{}{}
+		}
+	}
+	return container.KeysInt64(ids)
+}
+
+// LoadRepos loads repositories from database
+func (nl NotificationList) LoadRepos() (repo_model.RepositoryList, []int, error) {
+	if len(nl) == 0 {
+		return repo_model.RepositoryList{}, []int{}, nil
+	}
+
+	repoIDs := nl.getPendingRepoIDs()
+	repos := make(map[int64]*repo_model.Repository, len(repoIDs))
+	left := len(repoIDs)
+	for left > 0 {
+		limit := db.DefaultMaxInSize
+		if left < limit {
+			limit = left
+		}
+		rows, err := db.GetEngine(db.DefaultContext).
+			In("id", repoIDs[:limit]).
+			Rows(new(repo_model.Repository))
+		if err != nil {
+			return nil, nil, err
+		}
+
+		for rows.Next() {
+			var repo repo_model.Repository
+			err = rows.Scan(&repo)
+			if err != nil {
+				rows.Close()
+				return nil, nil, err
+			}
+
+			repos[repo.ID] = &repo
+		}
+		_ = rows.Close()
+
+		left -= limit
+		repoIDs = repoIDs[limit:]
+	}
+
+	failed := []int{}
+
+	reposList := make(repo_model.RepositoryList, 0, len(repoIDs))
+	for i, notification := range nl {
+		if notification.Repository == nil {
+			notification.Repository = repos[notification.RepoID]
+		}
+		if notification.Repository == nil {
+			log.Error("Notification[%d]: RepoID: %d not found", notification.ID, notification.RepoID)
+			failed = append(failed, i)
+			continue
+		}
+		var found bool
+		for _, r := range reposList {
+			if r.ID == notification.RepoID {
+				found = true
+				break
+			}
+		}
+		if !found {
+			reposList = append(reposList, notification.Repository)
+		}
+	}
+	return reposList, failed, nil
+}
+
+func (nl NotificationList) getPendingIssueIDs() []int64 {
+	ids := make(map[int64]struct{}, len(nl))
+	for _, notification := range nl {
+		if notification.Issue != nil {
+			continue
+		}
+		if _, ok := ids[notification.IssueID]; !ok {
+			ids[notification.IssueID] = struct{}{}
+		}
+	}
+	return container.KeysInt64(ids)
+}
+
+// LoadIssues loads issues from database
+func (nl NotificationList) LoadIssues() ([]int, error) {
+	if len(nl) == 0 {
+		return []int{}, nil
+	}
+
+	issueIDs := nl.getPendingIssueIDs()
+	issues := make(map[int64]*issues_model.Issue, len(issueIDs))
+	left := len(issueIDs)
+	for left > 0 {
+		limit := db.DefaultMaxInSize
+		if left < limit {
+			limit = left
+		}
+		rows, err := db.GetEngine(db.DefaultContext).
+			In("id", issueIDs[:limit]).
+			Rows(new(issues_model.Issue))
+		if err != nil {
+			return nil, err
+		}
+
+		for rows.Next() {
+			var issue issues_model.Issue
+			err = rows.Scan(&issue)
+			if err != nil {
+				rows.Close()
+				return nil, err
+			}
+
+			issues[issue.ID] = &issue
+		}
+		_ = rows.Close()
+
+		left -= limit
+		issueIDs = issueIDs[limit:]
+	}
+
+	failures := []int{}
+
+	for i, notification := range nl {
+		if notification.Issue == nil {
+			notification.Issue = issues[notification.IssueID]
+			if notification.Issue == nil {
+				if notification.IssueID != 0 {
+					log.Error("Notification[%d]: IssueID: %d Not Found", notification.ID, notification.IssueID)
+					failures = append(failures, i)
+				}
+				continue
+			}
+			notification.Issue.Repo = notification.Repository
+		}
+	}
+	return failures, nil
+}
+
+// Without returns the notification list without the failures
+func (nl NotificationList) Without(failures []int) NotificationList {
+	if len(failures) == 0 {
+		return nl
+	}
+	remaining := make([]*Notification, 0, len(nl))
+	last := -1
+	var i int
+	for _, i = range failures {
+		remaining = append(remaining, nl[last+1:i]...)
+		last = i
+	}
+	if len(nl) > i {
+		remaining = append(remaining, nl[i+1:]...)
+	}
+	return remaining
+}
+
+func (nl NotificationList) getPendingCommentIDs() []int64 {
+	ids := make(map[int64]struct{}, len(nl))
+	for _, notification := range nl {
+		if notification.CommentID == 0 || notification.Comment != nil {
+			continue
+		}
+		if _, ok := ids[notification.CommentID]; !ok {
+			ids[notification.CommentID] = struct{}{}
+		}
+	}
+	return container.KeysInt64(ids)
+}
+
+// LoadComments loads comments from database
+func (nl NotificationList) LoadComments() ([]int, error) {
+	if len(nl) == 0 {
+		return []int{}, nil
+	}
+
+	commentIDs := nl.getPendingCommentIDs()
+	comments := make(map[int64]*issues_model.Comment, len(commentIDs))
+	left := len(commentIDs)
+	for left > 0 {
+		limit := db.DefaultMaxInSize
+		if left < limit {
+			limit = left
+		}
+		rows, err := db.GetEngine(db.DefaultContext).
+			In("id", commentIDs[:limit]).
+			Rows(new(issues_model.Comment))
+		if err != nil {
+			return nil, err
+		}
+
+		for rows.Next() {
+			var comment issues_model.Comment
+			err = rows.Scan(&comment)
+			if err != nil {
+				rows.Close()
+				return nil, err
+			}
+
+			comments[comment.ID] = &comment
+		}
+		_ = rows.Close()
+
+		left -= limit
+		commentIDs = commentIDs[limit:]
+	}
+
+	failures := []int{}
+	for i, notification := range nl {
+		if notification.CommentID > 0 && notification.Comment == nil && comments[notification.CommentID] != nil {
+			notification.Comment = comments[notification.CommentID]
+			if notification.Comment == nil {
+				log.Error("Notification[%d]: CommentID[%d] failed to load", notification.ID, notification.CommentID)
+				failures = append(failures, i)
+				continue
+			}
+			notification.Comment.Issue = notification.Issue
+		}
+	}
+	return failures, nil
+}
+
+// GetNotificationCount returns the notification count for user
+func GetNotificationCount(ctx context.Context, user *user_model.User, status NotificationStatus) (count int64, err error) {
+	count, err = db.GetEngine(ctx).
+		Where("user_id = ?", user.ID).
+		And("status = ?", status).
+		Count(&Notification{})
+	return count, err
+}
+
+// UserIDCount is a simple coalition of UserID and Count
+type UserIDCount struct {
+	UserID int64
+	Count  int64
+}
+
+// GetUIDsAndNotificationCounts between the two provided times
+func GetUIDsAndNotificationCounts(since, until timeutil.TimeStamp) ([]UserIDCount, error) {
+	sql := `SELECT user_id, count(*) AS count FROM notification ` +
+		`WHERE user_id IN (SELECT user_id FROM notification WHERE updated_unix >= ? AND ` +
+		`updated_unix < ?) AND status = ? GROUP BY user_id`
+	var res []UserIDCount
+	return res, db.GetEngine(db.DefaultContext).SQL(sql, since, until, NotificationStatusUnread).Find(&res)
+}
+
+// SetIssueReadBy sets issue to be read by given user.
+func SetIssueReadBy(ctx context.Context, issueID, userID int64) error {
+	if err := issues_model.UpdateIssueUserByRead(userID, issueID); err != nil {
+		return err
+	}
+
+	return setIssueNotificationStatusReadIfUnread(ctx, userID, issueID)
+}
+
+func setIssueNotificationStatusReadIfUnread(ctx context.Context, userID, issueID int64) error {
+	notification, err := getIssueNotification(ctx, userID, issueID)
+	// ignore if not exists
+	if err != nil {
+		return nil
+	}
+
+	if notification.Status != NotificationStatusUnread {
+		return nil
+	}
+
+	notification.Status = NotificationStatusRead
+
+	_, err = db.GetEngine(ctx).ID(notification.ID).Update(notification)
+	return err
+}
+
+// SetRepoReadBy sets repo to be visited by given user.
+func SetRepoReadBy(ctx context.Context, userID, repoID int64) error {
+	_, err := db.GetEngine(ctx).Where(builder.Eq{
+		"user_id": userID,
+		"status":  NotificationStatusUnread,
+		"source":  NotificationSourceRepository,
+		"repo_id": repoID,
+	}).Cols("status").Update(&Notification{Status: NotificationStatusRead})
+	return err
+}
+
+// SetNotificationStatus change the notification status
+func SetNotificationStatus(notificationID int64, user *user_model.User, status NotificationStatus) (*Notification, error) {
+	notification, err := getNotificationByID(db.DefaultContext, notificationID)
+	if err != nil {
+		return notification, err
+	}
+
+	if notification.UserID != user.ID {
+		return nil, fmt.Errorf("Can't change notification of another user: %d, %d", notification.UserID, user.ID)
+	}
+
+	notification.Status = status
+
+	_, err = db.GetEngine(db.DefaultContext).ID(notificationID).Update(notification)
+	return notification, err
+}
+
+// GetNotificationByID return notification by ID
+func GetNotificationByID(notificationID int64) (*Notification, error) {
+	return getNotificationByID(db.DefaultContext, notificationID)
+}
+
+func getNotificationByID(ctx context.Context, notificationID int64) (*Notification, error) {
+	notification := new(Notification)
+	ok, err := db.GetEngine(ctx).
+		Where("id = ?", notificationID).
+		Get(notification)
+	if err != nil {
+		return nil, err
+	}
+
+	if !ok {
+		return nil, db.ErrNotExist{ID: notificationID}
+	}
+
+	return notification, nil
+}
+
+// UpdateNotificationStatuses updates the statuses of all of a user's notifications that are of the currentStatus type to the desiredStatus
+func UpdateNotificationStatuses(user *user_model.User, currentStatus, desiredStatus NotificationStatus) error {
+	n := &Notification{Status: desiredStatus, UpdatedBy: user.ID}
+	_, err := db.GetEngine(db.DefaultContext).
+		Where("user_id = ? AND status = ?", user.ID, currentStatus).
+		Cols("status", "updated_by", "updated_unix").
+		Update(n)
+	return err
+}
diff --git a/models/activities/notification_test.go b/models/activities/notification_test.go
new file mode 100644
index 0000000000..4ee16af076
--- /dev/null
+++ b/models/activities/notification_test.go
@@ -0,0 +1,112 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activities_test
+
+import (
+	"testing"
+
+	activities_model "code.gitea.io/gitea/models/activities"
+	"code.gitea.io/gitea/models/db"
+	issues_model "code.gitea.io/gitea/models/issues"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCreateOrUpdateIssueNotifications(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: 1})
+
+	assert.NoError(t, activities_model.CreateOrUpdateIssueNotifications(issue.ID, 0, 2, 0))
+
+	// User 9 is inactive, thus notifications for user 1 and 4 are created
+	notf := unittest.AssertExistsAndLoadBean(t, &activities_model.Notification{UserID: 1, IssueID: issue.ID})
+	assert.Equal(t, activities_model.NotificationStatusUnread, notf.Status)
+	unittest.CheckConsistencyFor(t, &issues_model.Issue{ID: issue.ID})
+
+	notf = unittest.AssertExistsAndLoadBean(t, &activities_model.Notification{UserID: 4, IssueID: issue.ID})
+	assert.Equal(t, activities_model.NotificationStatusUnread, notf.Status)
+}
+
+func TestNotificationsForUser(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	statuses := []activities_model.NotificationStatus{activities_model.NotificationStatusRead, activities_model.NotificationStatusUnread}
+	notfs, err := activities_model.NotificationsForUser(db.DefaultContext, user, statuses, 1, 10)
+	assert.NoError(t, err)
+	if assert.Len(t, notfs, 3) {
+		assert.EqualValues(t, 5, notfs[0].ID)
+		assert.EqualValues(t, user.ID, notfs[0].UserID)
+		assert.EqualValues(t, 4, notfs[1].ID)
+		assert.EqualValues(t, user.ID, notfs[1].UserID)
+		assert.EqualValues(t, 2, notfs[2].ID)
+		assert.EqualValues(t, user.ID, notfs[2].UserID)
+	}
+}
+
+func TestNotification_GetRepo(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	notf := unittest.AssertExistsAndLoadBean(t, &activities_model.Notification{RepoID: 1})
+	repo, err := notf.GetRepo()
+	assert.NoError(t, err)
+	assert.Equal(t, repo, notf.Repository)
+	assert.EqualValues(t, notf.RepoID, repo.ID)
+}
+
+func TestNotification_GetIssue(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	notf := unittest.AssertExistsAndLoadBean(t, &activities_model.Notification{RepoID: 1})
+	issue, err := notf.GetIssue()
+	assert.NoError(t, err)
+	assert.Equal(t, issue, notf.Issue)
+	assert.EqualValues(t, notf.IssueID, issue.ID)
+}
+
+func TestGetNotificationCount(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+	cnt, err := activities_model.GetNotificationCount(db.DefaultContext, user, activities_model.NotificationStatusRead)
+	assert.NoError(t, err)
+	assert.EqualValues(t, 0, cnt)
+
+	cnt, err = activities_model.GetNotificationCount(db.DefaultContext, user, activities_model.NotificationStatusUnread)
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+}
+
+func TestSetNotificationStatus(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	notf := unittest.AssertExistsAndLoadBean(t,
+		&activities_model.Notification{UserID: user.ID, Status: activities_model.NotificationStatusRead})
+	_, err := activities_model.SetNotificationStatus(notf.ID, user, activities_model.NotificationStatusPinned)
+	assert.NoError(t, err)
+	unittest.AssertExistsAndLoadBean(t,
+		&activities_model.Notification{ID: notf.ID, Status: activities_model.NotificationStatusPinned})
+
+	_, err = activities_model.SetNotificationStatus(1, user, activities_model.NotificationStatusRead)
+	assert.Error(t, err)
+	_, err = activities_model.SetNotificationStatus(unittest.NonexistentID, user, activities_model.NotificationStatusRead)
+	assert.Error(t, err)
+}
+
+func TestUpdateNotificationStatuses(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	notfUnread := unittest.AssertExistsAndLoadBean(t,
+		&activities_model.Notification{UserID: user.ID, Status: activities_model.NotificationStatusUnread})
+	notfRead := unittest.AssertExistsAndLoadBean(t,
+		&activities_model.Notification{UserID: user.ID, Status: activities_model.NotificationStatusRead})
+	notfPinned := unittest.AssertExistsAndLoadBean(t,
+		&activities_model.Notification{UserID: user.ID, Status: activities_model.NotificationStatusPinned})
+	assert.NoError(t, activities_model.UpdateNotificationStatuses(user, activities_model.NotificationStatusUnread, activities_model.NotificationStatusRead))
+	unittest.AssertExistsAndLoadBean(t,
+		&activities_model.Notification{ID: notfUnread.ID, Status: activities_model.NotificationStatusRead})
+	unittest.AssertExistsAndLoadBean(t,
+		&activities_model.Notification{ID: notfRead.ID, Status: activities_model.NotificationStatusRead})
+	unittest.AssertExistsAndLoadBean(t,
+		&activities_model.Notification{ID: notfPinned.ID, Status: activities_model.NotificationStatusPinned})
+}
diff --git a/models/activities/repo_activity.go b/models/activities/repo_activity.go
new file mode 100644
index 0000000000..684ceee272
--- /dev/null
+++ b/models/activities/repo_activity.go
@@ -0,0 +1,366 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activities
+
+import (
+	"context"
+	"fmt"
+	"sort"
+	"time"
+
+	"code.gitea.io/gitea/models/db"
+	issues_model "code.gitea.io/gitea/models/issues"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/git"
+
+	"xorm.io/xorm"
+)
+
+// ActivityAuthorData represents statistical git commit count data
+type ActivityAuthorData struct {
+	Name       string `json:"name"`
+	Login      string `json:"login"`
+	AvatarLink string `json:"avatar_link"`
+	HomeLink   string `json:"home_link"`
+	Commits    int64  `json:"commits"`
+}
+
+// ActivityStats represets issue and pull request information.
+type ActivityStats struct {
+	OpenedPRs                   issues_model.PullRequestList
+	OpenedPRAuthorCount         int64
+	MergedPRs                   issues_model.PullRequestList
+	MergedPRAuthorCount         int64
+	OpenedIssues                issues_model.IssueList
+	OpenedIssueAuthorCount      int64
+	ClosedIssues                issues_model.IssueList
+	ClosedIssueAuthorCount      int64
+	UnresolvedIssues            issues_model.IssueList
+	PublishedReleases           []*repo_model.Release
+	PublishedReleaseAuthorCount int64
+	Code                        *git.CodeActivityStats
+}
+
+// GetActivityStats return stats for repository at given time range
+func GetActivityStats(ctx context.Context, repo *repo_model.Repository, timeFrom time.Time, releases, issues, prs, code bool) (*ActivityStats, error) {
+	stats := &ActivityStats{Code: &git.CodeActivityStats{}}
+	if releases {
+		if err := stats.FillReleases(repo.ID, timeFrom); err != nil {
+			return nil, fmt.Errorf("FillReleases: %v", err)
+		}
+	}
+	if prs {
+		if err := stats.FillPullRequests(repo.ID, timeFrom); err != nil {
+			return nil, fmt.Errorf("FillPullRequests: %v", err)
+		}
+	}
+	if issues {
+		if err := stats.FillIssues(repo.ID, timeFrom); err != nil {
+			return nil, fmt.Errorf("FillIssues: %v", err)
+		}
+	}
+	if err := stats.FillUnresolvedIssues(repo.ID, timeFrom, issues, prs); err != nil {
+		return nil, fmt.Errorf("FillUnresolvedIssues: %v", err)
+	}
+	if code {
+		gitRepo, closer, err := git.RepositoryFromContextOrOpen(ctx, repo.RepoPath())
+		if err != nil {
+			return nil, fmt.Errorf("OpenRepository: %v", err)
+		}
+		defer closer.Close()
+
+		code, err := gitRepo.GetCodeActivityStats(timeFrom, repo.DefaultBranch)
+		if err != nil {
+			return nil, fmt.Errorf("FillFromGit: %v", err)
+		}
+		stats.Code = code
+	}
+	return stats, nil
+}
+
+// GetActivityStatsTopAuthors returns top author stats for git commits for all branches
+func GetActivityStatsTopAuthors(ctx context.Context, repo *repo_model.Repository, timeFrom time.Time, count int) ([]*ActivityAuthorData, error) {
+	gitRepo, closer, err := git.RepositoryFromContextOrOpen(ctx, repo.RepoPath())
+	if err != nil {
+		return nil, fmt.Errorf("OpenRepository: %v", err)
+	}
+	defer closer.Close()
+
+	code, err := gitRepo.GetCodeActivityStats(timeFrom, "")
+	if err != nil {
+		return nil, fmt.Errorf("FillFromGit: %v", err)
+	}
+	if code.Authors == nil {
+		return nil, nil
+	}
+	users := make(map[int64]*ActivityAuthorData)
+	var unknownUserID int64
+	unknownUserAvatarLink := user_model.NewGhostUser().AvatarLink()
+	for _, v := range code.Authors {
+		if len(v.Email) == 0 {
+			continue
+		}
+		u, err := user_model.GetUserByEmail(v.Email)
+		if u == nil || user_model.IsErrUserNotExist(err) {
+			unknownUserID--
+			users[unknownUserID] = &ActivityAuthorData{
+				Name:       v.Name,
+				AvatarLink: unknownUserAvatarLink,
+				Commits:    v.Commits,
+			}
+			continue
+		}
+		if err != nil {
+			return nil, err
+		}
+		if user, ok := users[u.ID]; !ok {
+			users[u.ID] = &ActivityAuthorData{
+				Name:       u.DisplayName(),
+				Login:      u.LowerName,
+				AvatarLink: u.AvatarLink(),
+				HomeLink:   u.HomeLink(),
+				Commits:    v.Commits,
+			}
+		} else {
+			user.Commits += v.Commits
+		}
+	}
+	v := make([]*ActivityAuthorData, 0, len(users))
+	for _, u := range users {
+		v = append(v, u)
+	}
+
+	sort.Slice(v, func(i, j int) bool {
+		return v[i].Commits > v[j].Commits
+	})
+
+	cnt := count
+	if cnt > len(v) {
+		cnt = len(v)
+	}
+
+	return v[:cnt], nil
+}
+
+// ActivePRCount returns total active pull request count
+func (stats *ActivityStats) ActivePRCount() int {
+	return stats.OpenedPRCount() + stats.MergedPRCount()
+}
+
+// OpenedPRCount returns opened pull request count
+func (stats *ActivityStats) OpenedPRCount() int {
+	return len(stats.OpenedPRs)
+}
+
+// OpenedPRPerc returns opened pull request percents from total active
+func (stats *ActivityStats) OpenedPRPerc() int {
+	return int(float32(stats.OpenedPRCount()) / float32(stats.ActivePRCount()) * 100.0)
+}
+
+// MergedPRCount returns merged pull request count
+func (stats *ActivityStats) MergedPRCount() int {
+	return len(stats.MergedPRs)
+}
+
+// MergedPRPerc returns merged pull request percent from total active
+func (stats *ActivityStats) MergedPRPerc() int {
+	return int(float32(stats.MergedPRCount()) / float32(stats.ActivePRCount()) * 100.0)
+}
+
+// ActiveIssueCount returns total active issue count
+func (stats *ActivityStats) ActiveIssueCount() int {
+	return stats.OpenedIssueCount() + stats.ClosedIssueCount()
+}
+
+// OpenedIssueCount returns open issue count
+func (stats *ActivityStats) OpenedIssueCount() int {
+	return len(stats.OpenedIssues)
+}
+
+// OpenedIssuePerc returns open issue count percent from total active
+func (stats *ActivityStats) OpenedIssuePerc() int {
+	return int(float32(stats.OpenedIssueCount()) / float32(stats.ActiveIssueCount()) * 100.0)
+}
+
+// ClosedIssueCount returns closed issue count
+func (stats *ActivityStats) ClosedIssueCount() int {
+	return len(stats.ClosedIssues)
+}
+
+// ClosedIssuePerc returns closed issue count percent from total active
+func (stats *ActivityStats) ClosedIssuePerc() int {
+	return int(float32(stats.ClosedIssueCount()) / float32(stats.ActiveIssueCount()) * 100.0)
+}
+
+// UnresolvedIssueCount returns unresolved issue and pull request count
+func (stats *ActivityStats) UnresolvedIssueCount() int {
+	return len(stats.UnresolvedIssues)
+}
+
+// PublishedReleaseCount returns published release count
+func (stats *ActivityStats) PublishedReleaseCount() int {
+	return len(stats.PublishedReleases)
+}
+
+// FillPullRequests returns pull request information for activity page
+func (stats *ActivityStats) FillPullRequests(repoID int64, fromTime time.Time) error {
+	var err error
+	var count int64
+
+	// Merged pull requests
+	sess := pullRequestsForActivityStatement(repoID, fromTime, true)
+	sess.OrderBy("pull_request.merged_unix DESC")
+	stats.MergedPRs = make(issues_model.PullRequestList, 0)
+	if err = sess.Find(&stats.MergedPRs); err != nil {
+		return err
+	}
+	if err = stats.MergedPRs.LoadAttributes(); err != nil {
+		return err
+	}
+
+	// Merged pull request authors
+	sess = pullRequestsForActivityStatement(repoID, fromTime, true)
+	if _, err = sess.Select("count(distinct issue.poster_id) as `count`").Table("pull_request").Get(&count); err != nil {
+		return err
+	}
+	stats.MergedPRAuthorCount = count
+
+	// Opened pull requests
+	sess = pullRequestsForActivityStatement(repoID, fromTime, false)
+	sess.OrderBy("issue.created_unix ASC")
+	stats.OpenedPRs = make(issues_model.PullRequestList, 0)
+	if err = sess.Find(&stats.OpenedPRs); err != nil {
+		return err
+	}
+	if err = stats.OpenedPRs.LoadAttributes(); err != nil {
+		return err
+	}
+
+	// Opened pull request authors
+	sess = pullRequestsForActivityStatement(repoID, fromTime, false)
+	if _, err = sess.Select("count(distinct issue.poster_id) as `count`").Table("pull_request").Get(&count); err != nil {
+		return err
+	}
+	stats.OpenedPRAuthorCount = count
+
+	return nil
+}
+
+func pullRequestsForActivityStatement(repoID int64, fromTime time.Time, merged bool) *xorm.Session {
+	sess := db.GetEngine(db.DefaultContext).Where("pull_request.base_repo_id=?", repoID).
+		Join("INNER", "issue", "pull_request.issue_id = issue.id")
+
+	if merged {
+		sess.And("pull_request.has_merged = ?", true)
+		sess.And("pull_request.merged_unix >= ?", fromTime.Unix())
+	} else {
+		sess.And("issue.is_closed = ?", false)
+		sess.And("issue.created_unix >= ?", fromTime.Unix())
+	}
+
+	return sess
+}
+
+// FillIssues returns issue information for activity page
+func (stats *ActivityStats) FillIssues(repoID int64, fromTime time.Time) error {
+	var err error
+	var count int64
+
+	// Closed issues
+	sess := issuesForActivityStatement(repoID, fromTime, true, false)
+	sess.OrderBy("issue.closed_unix DESC")
+	stats.ClosedIssues = make(issues_model.IssueList, 0)
+	if err = sess.Find(&stats.ClosedIssues); err != nil {
+		return err
+	}
+
+	// Closed issue authors
+	sess = issuesForActivityStatement(repoID, fromTime, true, false)
+	if _, err = sess.Select("count(distinct issue.poster_id) as `count`").Table("issue").Get(&count); err != nil {
+		return err
+	}
+	stats.ClosedIssueAuthorCount = count
+
+	// New issues
+	sess = issuesForActivityStatement(repoID, fromTime, false, false)
+	sess.OrderBy("issue.created_unix ASC")
+	stats.OpenedIssues = make(issues_model.IssueList, 0)
+	if err = sess.Find(&stats.OpenedIssues); err != nil {
+		return err
+	}
+
+	// Opened issue authors
+	sess = issuesForActivityStatement(repoID, fromTime, false, false)
+	if _, err = sess.Select("count(distinct issue.poster_id) as `count`").Table("issue").Get(&count); err != nil {
+		return err
+	}
+	stats.OpenedIssueAuthorCount = count
+
+	return nil
+}
+
+// FillUnresolvedIssues returns unresolved issue and pull request information for activity page
+func (stats *ActivityStats) FillUnresolvedIssues(repoID int64, fromTime time.Time, issues, prs bool) error {
+	// Check if we need to select anything
+	if !issues && !prs {
+		return nil
+	}
+	sess := issuesForActivityStatement(repoID, fromTime, false, true)
+	if !issues || !prs {
+		sess.And("issue.is_pull = ?", prs)
+	}
+	sess.OrderBy("issue.updated_unix DESC")
+	stats.UnresolvedIssues = make(issues_model.IssueList, 0)
+	return sess.Find(&stats.UnresolvedIssues)
+}
+
+func issuesForActivityStatement(repoID int64, fromTime time.Time, closed, unresolved bool) *xorm.Session {
+	sess := db.GetEngine(db.DefaultContext).Where("issue.repo_id = ?", repoID).
+		And("issue.is_closed = ?", closed)
+
+	if !unresolved {
+		sess.And("issue.is_pull = ?", false)
+		if closed {
+			sess.And("issue.closed_unix >= ?", fromTime.Unix())
+		} else {
+			sess.And("issue.created_unix >= ?", fromTime.Unix())
+		}
+	} else {
+		sess.And("issue.created_unix < ?", fromTime.Unix())
+		sess.And("issue.updated_unix >= ?", fromTime.Unix())
+	}
+
+	return sess
+}
+
+// FillReleases returns release information for activity page
+func (stats *ActivityStats) FillReleases(repoID int64, fromTime time.Time) error {
+	var err error
+	var count int64
+
+	// Published releases list
+	sess := releasesForActivityStatement(repoID, fromTime)
+	sess.OrderBy("release.created_unix DESC")
+	stats.PublishedReleases = make([]*repo_model.Release, 0)
+	if err = sess.Find(&stats.PublishedReleases); err != nil {
+		return err
+	}
+
+	// Published releases authors
+	sess = releasesForActivityStatement(repoID, fromTime)
+	if _, err = sess.Select("count(distinct release.publisher_id) as `count`").Table("release").Get(&count); err != nil {
+		return err
+	}
+	stats.PublishedReleaseAuthorCount = count
+
+	return nil
+}
+
+func releasesForActivityStatement(repoID int64, fromTime time.Time) *xorm.Session {
+	return db.GetEngine(db.DefaultContext).Where("release.repo_id = ?", repoID).
+		And("release.is_draft = ?", false).
+		And("release.created_unix >= ?", fromTime.Unix())
+}
diff --git a/models/activities/statistic.go b/models/activities/statistic.go
new file mode 100644
index 0000000000..ea785a3ee2
--- /dev/null
+++ b/models/activities/statistic.go
@@ -0,0 +1,115 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package activities
+
+import (
+	asymkey_model "code.gitea.io/gitea/models/asymkey"
+	"code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
+	issues_model "code.gitea.io/gitea/models/issues"
+	"code.gitea.io/gitea/models/organization"
+	access_model "code.gitea.io/gitea/models/perm/access"
+	project_model "code.gitea.io/gitea/models/project"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/models/webhook"
+	"code.gitea.io/gitea/modules/setting"
+)
+
+// Statistic contains the database statistics
+type Statistic struct {
+	Counter struct {
+		User, Org, PublicKey,
+		Repo, Watch, Star, Action, Access,
+		Issue, IssueClosed, IssueOpen,
+		Comment, Oauth, Follow,
+		Mirror, Release, AuthSource, Webhook,
+		Milestone, Label, HookTask,
+		Team, UpdateTask, Project,
+		ProjectBoard, Attachment int64
+		IssueByLabel      []IssueByLabelCount
+		IssueByRepository []IssueByRepositoryCount
+	}
+}
+
+// IssueByLabelCount contains the number of issue group by label
+type IssueByLabelCount struct {
+	Count int64
+	Label string
+}
+
+// IssueByRepositoryCount contains the number of issue group by repository
+type IssueByRepositoryCount struct {
+	Count      int64
+	OwnerName  string
+	Repository string
+}
+
+// GetStatistic returns the database statistics
+func GetStatistic() (stats Statistic) {
+	e := db.GetEngine(db.DefaultContext)
+	stats.Counter.User = user_model.CountUsers(nil)
+	stats.Counter.Org, _ = organization.CountOrgs(organization.FindOrgOptions{IncludePrivate: true})
+	stats.Counter.PublicKey, _ = e.Count(new(asymkey_model.PublicKey))
+	stats.Counter.Repo, _ = repo_model.CountRepositories(db.DefaultContext, repo_model.CountRepositoryOptions{})
+	stats.Counter.Watch, _ = e.Count(new(repo_model.Watch))
+	stats.Counter.Star, _ = e.Count(new(repo_model.Star))
+	stats.Counter.Action, _ = db.EstimateCount(db.DefaultContext, new(Action))
+	stats.Counter.Access, _ = e.Count(new(access_model.Access))
+
+	type IssueCount struct {
+		Count    int64
+		IsClosed bool
+	}
+
+	if setting.Metrics.EnabledIssueByLabel {
+		stats.Counter.IssueByLabel = []IssueByLabelCount{}
+
+		_ = e.Select("COUNT(*) AS count, l.name AS label").
+			Join("LEFT", "label l", "l.id=il.label_id").
+			Table("issue_label il").
+			GroupBy("l.name").
+			Find(&stats.Counter.IssueByLabel)
+	}
+
+	if setting.Metrics.EnabledIssueByRepository {
+		stats.Counter.IssueByRepository = []IssueByRepositoryCount{}
+
+		_ = e.Select("COUNT(*) AS count, r.owner_name, r.name AS repository").
+			Join("LEFT", "repository r", "r.id=i.repo_id").
+			Table("issue i").
+			GroupBy("r.owner_name, r.name").
+			Find(&stats.Counter.IssueByRepository)
+	}
+
+	issueCounts := []IssueCount{}
+
+	_ = e.Select("COUNT(*) AS count, is_closed").Table("issue").GroupBy("is_closed").Find(&issueCounts)
+	for _, c := range issueCounts {
+		if c.IsClosed {
+			stats.Counter.IssueClosed = c.Count
+		} else {
+			stats.Counter.IssueOpen = c.Count
+		}
+	}
+
+	stats.Counter.Issue = stats.Counter.IssueClosed + stats.Counter.IssueOpen
+
+	stats.Counter.Comment, _ = e.Count(new(issues_model.Comment))
+	stats.Counter.Oauth = 0
+	stats.Counter.Follow, _ = e.Count(new(user_model.Follow))
+	stats.Counter.Mirror, _ = e.Count(new(repo_model.Mirror))
+	stats.Counter.Release, _ = e.Count(new(repo_model.Release))
+	stats.Counter.AuthSource = auth.CountSources()
+	stats.Counter.Webhook, _ = e.Count(new(webhook.Webhook))
+	stats.Counter.Milestone, _ = e.Count(new(issues_model.Milestone))
+	stats.Counter.Label, _ = e.Count(new(issues_model.Label))
+	stats.Counter.HookTask, _ = e.Count(new(webhook.HookTask))
+	stats.Counter.Team, _ = e.Count(new(organization.Team))
+	stats.Counter.Attachment, _ = e.Count(new(repo_model.Attachment))
+	stats.Counter.Project, _ = e.Count(new(project_model.Project))
+	stats.Counter.ProjectBoard, _ = e.Count(new(project_model.Board))
+	return stats
+}
diff --git a/models/activities/user_heatmap.go b/models/activities/user_heatmap.go
new file mode 100644
index 0000000000..6e76be6c6b
--- /dev/null
+++ b/models/activities/user_heatmap.go
@@ -0,0 +1,72 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.package models
+
+package activities
+
+import (
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/timeutil"
+)
+
+// UserHeatmapData represents the data needed to create a heatmap
+type UserHeatmapData struct {
+	Timestamp     timeutil.TimeStamp `json:"timestamp"`
+	Contributions int64              `json:"contributions"`
+}
+
+// GetUserHeatmapDataByUser returns an array of UserHeatmapData
+func GetUserHeatmapDataByUser(user, doer *user_model.User) ([]*UserHeatmapData, error) {
+	return getUserHeatmapData(user, nil, doer)
+}
+
+// GetUserHeatmapDataByUserTeam returns an array of UserHeatmapData
+func GetUserHeatmapDataByUserTeam(user *user_model.User, team *organization.Team, doer *user_model.User) ([]*UserHeatmapData, error) {
+	return getUserHeatmapData(user, team, doer)
+}
+
+func getUserHeatmapData(user *user_model.User, team *organization.Team, doer *user_model.User) ([]*UserHeatmapData, error) {
+	hdata := make([]*UserHeatmapData, 0)
+
+	if !ActivityReadable(user, doer) {
+		return hdata, nil
+	}
+
+	// Group by 15 minute intervals which will allow the client to accurately shift the timestamp to their timezone.
+	// The interval is based on the fact that there are timezones such as UTC +5:30 and UTC +12:45.
+	groupBy := "created_unix / 900 * 900"
+	groupByName := "timestamp" // We need this extra case because mssql doesn't allow grouping by alias
+	switch {
+	case setting.Database.UseMySQL:
+		groupBy = "created_unix DIV 900 * 900"
+	case setting.Database.UseMSSQL:
+		groupByName = groupBy
+	}
+
+	cond, err := activityQueryCondition(GetFeedsOptions{
+		RequestedUser:  user,
+		RequestedTeam:  team,
+		Actor:          doer,
+		IncludePrivate: true, // don't filter by private, as we already filter by repo access
+		IncludeDeleted: true,
+		// * Heatmaps for individual users only include actions that the user themself did.
+		// * For organizations actions by all users that were made in owned
+		//   repositories are counted.
+		OnlyPerformedBy: !user.IsOrganization(),
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return hdata, db.GetEngine(db.DefaultContext).
+		Select(groupBy+" AS timestamp, count(user_id) as contributions").
+		Table("action").
+		Where(cond).
+		And("created_unix > ?", timeutil.TimeStampNow()-31536000).
+		GroupBy(groupByName).
+		OrderBy("timestamp").
+		Find(&hdata)
+}
diff --git a/models/activities/user_heatmap_test.go b/models/activities/user_heatmap_test.go
new file mode 100644
index 0000000000..a8a240f790
--- /dev/null
+++ b/models/activities/user_heatmap_test.go
@@ -0,0 +1,101 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.package models
+
+package activities_test
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	activities_model "code.gitea.io/gitea/models/activities"
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/json"
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetUserHeatmapDataByUser(t *testing.T) {
+	testCases := []struct {
+		desc        string
+		userID      int64
+		doerID      int64
+		CountResult int
+		JSONResult  string
+	}{
+		{
+			"self looks at action in private repo",
+			2, 2, 1, `[{"timestamp":1603227600,"contributions":1}]`,
+		},
+		{
+			"admin looks at action in private repo",
+			2, 1, 1, `[{"timestamp":1603227600,"contributions":1}]`,
+		},
+		{
+			"other user looks at action in private repo",
+			2, 3, 0, `[]`,
+		},
+		{
+			"nobody looks at action in private repo",
+			2, 0, 0, `[]`,
+		},
+		{
+			"collaborator looks at action in private repo",
+			16, 15, 1, `[{"timestamp":1603267200,"contributions":1}]`,
+		},
+		{
+			"no action action not performed by target user",
+			3, 3, 0, `[]`,
+		},
+		{
+			"multiple actions performed with two grouped together",
+			10, 10, 3, `[{"timestamp":1603009800,"contributions":1},{"timestamp":1603010700,"contributions":2}]`,
+		},
+	}
+	// Prepare
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	// Mock time
+	timeutil.Set(time.Date(2021, 1, 1, 0, 0, 0, 0, time.UTC))
+	defer timeutil.Unset()
+
+	for _, tc := range testCases {
+		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: tc.userID})
+
+		doer := &user_model.User{ID: tc.doerID}
+		_, err := unittest.LoadBeanIfExists(doer)
+		assert.NoError(t, err)
+		if tc.doerID == 0 {
+			doer = nil
+		}
+
+		// get the action for comparison
+		actions, err := activities_model.GetFeeds(db.DefaultContext, activities_model.GetFeedsOptions{
+			RequestedUser:   user,
+			Actor:           doer,
+			IncludePrivate:  true,
+			OnlyPerformedBy: true,
+			IncludeDeleted:  true,
+		})
+		assert.NoError(t, err)
+
+		// Get the heatmap and compare
+		heatmap, err := activities_model.GetUserHeatmapDataByUser(user, doer)
+		var contributions int
+		for _, hm := range heatmap {
+			contributions += int(hm.Contributions)
+		}
+		assert.NoError(t, err)
+		assert.Len(t, actions, contributions, "invalid action count: did the test data became too old?")
+		assert.Equal(t, tc.CountResult, contributions, fmt.Sprintf("testcase '%s'", tc.desc))
+
+		// Test JSON rendering
+		jsonData, err := json.Marshal(heatmap)
+		assert.NoError(t, err)
+		assert.Equal(t, tc.JSONResult, string(jsonData))
+	}
+}