Adding upstream version 9.0.3.

Signed-off-by: Daniel Baumann <daniel@debian.org>

12 files changed, 1936 insertions, 0 deletions

diff --git a/services/user/TestPurgeUser/public_key.yml b/services/user/TestPurgeUser/public_key.yml
new file mode 100644
index 0000000..75e409a
--- /dev/null
+++ b/services/user/TestPurgeUser/public_key.yml
@@ -0,0 +1,11 @@
+-
+  id: 1001
+  owner_id: 2
+  name: user2@localhost
+  fingerprint: "SHA256:7s+isLFauDv7QSbhAd0Z4OGIYJlQQ4YMtOH9LdjCZL8"
+  content: "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHAv3EOUcaK918Fk9d7mWuVS7oQamif/PNwqnAf/Z34G user2@localhost"
+  mode: 2
+  type: 3
+  created_unix: 1733363453
+  updated_unix: 1733363453
+  login_source_id: 0
diff --git a/services/user/avatar.go b/services/user/avatar.go
new file mode 100644
index 0000000..3f87466
--- /dev/null
+++ b/services/user/avatar.go
@@ -0,0 +1,73 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+
+	"code.gitea.io/gitea/models/db"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/avatar"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/storage"
+)
+
+// UploadAvatar saves custom avatar for user.
+func UploadAvatar(ctx context.Context, u *user_model.User, data []byte) error {
+	avatarData, err := avatar.ProcessAvatarImage(data)
+	if err != nil {
+		return err
+	}
+
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	u.UseCustomAvatar = true
+	u.Avatar = avatar.HashAvatar(u.ID, data)
+	if err = user_model.UpdateUserCols(ctx, u, "use_custom_avatar", "avatar"); err != nil {
+		return fmt.Errorf("updateUser: %w", err)
+	}
+
+	if err := storage.SaveFrom(storage.Avatars, u.CustomAvatarRelativePath(), func(w io.Writer) error {
+		_, err := w.Write(avatarData)
+		return err
+	}); err != nil {
+		return fmt.Errorf("Failed to create dir %s: %w", u.CustomAvatarRelativePath(), err)
+	}
+
+	return committer.Commit()
+}
+
+// DeleteAvatar deletes the user's custom avatar.
+func DeleteAvatar(ctx context.Context, u *user_model.User) error {
+	aPath := u.CustomAvatarRelativePath()
+	log.Trace("DeleteAvatar[%d]: %s", u.ID, aPath)
+
+	return db.WithTx(ctx, func(ctx context.Context) error {
+		hasAvatar := len(u.Avatar) > 0
+		u.UseCustomAvatar = false
+		u.Avatar = ""
+		if _, err := db.GetEngine(ctx).ID(u.ID).Cols("avatar, use_custom_avatar").Update(u); err != nil {
+			return fmt.Errorf("DeleteAvatar: %w", err)
+		}
+
+		if hasAvatar {
+			if err := storage.Avatars.Delete(aPath); err != nil {
+				if !errors.Is(err, os.ErrNotExist) {
+					return fmt.Errorf("failed to remove %s: %w", aPath, err)
+				}
+				log.Warn("Deleting avatar %s but it doesn't exist", aPath)
+			}
+		}
+
+		return nil
+	})
+}
diff --git a/services/user/avatar_test.go b/services/user/avatar_test.go
new file mode 100644
index 0000000..21fca8d
--- /dev/null
+++ b/services/user/avatar_test.go
@@ -0,0 +1,81 @@
+// Copyright The Forgejo Authors.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"bytes"
+	"image"
+	"image/png"
+	"os"
+	"testing"
+
+	"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/storage"
+	"code.gitea.io/gitea/modules/test"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type alreadyDeletedStorage struct {
+	storage.DiscardStorage
+}
+
+func (s alreadyDeletedStorage) Delete(_ string) error {
+	return os.ErrNotExist
+}
+
+func TestUserDeleteAvatar(t *testing.T) {
+	myImage := image.NewRGBA(image.Rect(0, 0, 1, 1))
+	var buff bytes.Buffer
+	png.Encode(&buff, myImage)
+
+	t.Run("AtomicStorageFailure", func(t *testing.T) {
+		defer test.MockProtect[storage.ObjectStorage](&storage.Avatars)()
+
+		require.NoError(t, unittest.PrepareTestDatabase())
+		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+
+		err := UploadAvatar(db.DefaultContext, user, buff.Bytes())
+		require.NoError(t, err)
+		verification := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+		assert.NotEqual(t, "", verification.Avatar)
+
+		// fail to delete ...
+		storage.Avatars = storage.UninitializedStorage
+		err = DeleteAvatar(db.DefaultContext, user)
+		require.Error(t, err)
+
+		// ... the avatar is not removed from the database
+		verification = unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+		assert.True(t, verification.UseCustomAvatar)
+
+		// already deleted ...
+		storage.Avatars = alreadyDeletedStorage{}
+		err = DeleteAvatar(db.DefaultContext, user)
+		require.NoError(t, err)
+
+		// ... the avatar is removed from the database
+		verification = unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+		assert.Equal(t, "", verification.Avatar)
+	})
+
+	t.Run("Success", func(t *testing.T) {
+		require.NoError(t, unittest.PrepareTestDatabase())
+		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+
+		err := UploadAvatar(db.DefaultContext, user, buff.Bytes())
+		require.NoError(t, err)
+		verification := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+		assert.NotEqual(t, "", verification.Avatar)
+
+		err = DeleteAvatar(db.DefaultContext, user)
+		require.NoError(t, err)
+
+		verification = unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+		assert.Equal(t, "", verification.Avatar)
+	})
+}
diff --git a/services/user/block.go b/services/user/block.go
new file mode 100644
index 0000000..0b31119
--- /dev/null
+++ b/services/user/block.go
@@ -0,0 +1,95 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+package user
+
+import (
+	"context"
+
+	model "code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+
+	"xorm.io/builder"
+)
+
+// BlockUser adds a blocked user entry for userID to block blockID.
+// TODO: Figure out if instance admins should be immune to blocking.
+// TODO: Add more mechanism like removing blocked user as collaborator on
+// repositories where the user is an owner.
+func BlockUser(ctx context.Context, userID, blockID int64) error {
+	if userID == blockID || user_model.IsBlocked(ctx, userID, blockID) {
+		return nil
+	}
+
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	// Add the blocked user entry.
+	_, err = db.GetEngine(ctx).Insert(&user_model.BlockedUser{UserID: userID, BlockID: blockID})
+	if err != nil {
+		return err
+	}
+
+	// Unfollow the user from the block's perspective.
+	err = user_model.UnfollowUser(ctx, blockID, userID)
+	if err != nil {
+		return err
+	}
+
+	// Unfollow the user from the doer's perspective.
+	err = user_model.UnfollowUser(ctx, userID, blockID)
+	if err != nil {
+		return err
+	}
+
+	// Blocked user unwatch all repository owned by the doer.
+	repoIDs, err := repo_model.GetWatchedRepoIDsOwnedBy(ctx, blockID, userID)
+	if err != nil {
+		return err
+	}
+
+	err = repo_model.UnwatchRepos(ctx, blockID, repoIDs)
+	if err != nil {
+		return err
+	}
+
+	// Remove blocked user as collaborator from repositories the user owns as an
+	// individual.
+	collabsID, err := repo_model.GetCollaboratorWithUser(ctx, userID, blockID)
+	if err != nil {
+		return err
+	}
+
+	_, err = db.GetEngine(ctx).In("id", collabsID).Delete(&repo_model.Collaboration{})
+	if err != nil {
+		return err
+	}
+
+	// Remove pending repository transfers, and set the status on those repository
+	// back to ready.
+	pendingTransfersIDs, err := model.GetPendingTransferIDs(ctx, userID, blockID)
+	if err != nil {
+		return err
+	}
+
+	// Use a subquery instead of a JOIN, because not every database supports JOIN
+	// on a UPDATE query.
+	_, err = db.GetEngine(ctx).Table("repository").
+		In("id", builder.Select("repo_id").From("repo_transfer").Where(builder.In("id", pendingTransfersIDs))).
+		Cols("status").
+		Update(&repo_model.Repository{Status: repo_model.RepositoryReady})
+	if err != nil {
+		return err
+	}
+
+	_, err = db.GetEngine(ctx).In("id", pendingTransfersIDs).Delete(&model.RepoTransfer{})
+	if err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}
diff --git a/services/user/block_test.go b/services/user/block_test.go
new file mode 100644
index 0000000..f9e95ed
--- /dev/null
+++ b/services/user/block_test.go
@@ -0,0 +1,92 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"testing"
+
+	model "code.gitea.io/gitea/models"
+	"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"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestBlockUser will ensure that when you block a user, certain actions have
+// been taken, like unfollowing each other etc.
+func TestBlockUser(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	doer := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 5})
+	blockedUser := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+
+	t.Run("Follow", func(t *testing.T) {
+		defer user_model.UnblockUser(db.DefaultContext, doer.ID, blockedUser.ID)
+
+		// Follow each other.
+		require.NoError(t, user_model.FollowUser(db.DefaultContext, doer.ID, blockedUser.ID))
+		require.NoError(t, user_model.FollowUser(db.DefaultContext, blockedUser.ID, doer.ID))
+
+		require.NoError(t, BlockUser(db.DefaultContext, doer.ID, blockedUser.ID))
+
+		// Ensure they aren't following each other anymore.
+		assert.False(t, user_model.IsFollowing(db.DefaultContext, doer.ID, blockedUser.ID))
+		assert.False(t, user_model.IsFollowing(db.DefaultContext, blockedUser.ID, doer.ID))
+	})
+
+	t.Run("Watch", func(t *testing.T) {
+		defer user_model.UnblockUser(db.DefaultContext, doer.ID, blockedUser.ID)
+
+		// Blocked user watch repository of doer.
+		repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{OwnerID: doer.ID})
+		require.NoError(t, repo_model.WatchRepo(db.DefaultContext, blockedUser.ID, repo.ID, true))
+
+		require.NoError(t, BlockUser(db.DefaultContext, doer.ID, blockedUser.ID))
+
+		// Ensure blocked user isn't following doer's repository.
+		assert.False(t, repo_model.IsWatching(db.DefaultContext, blockedUser.ID, repo.ID))
+	})
+
+	t.Run("Collaboration", func(t *testing.T) {
+		doer := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 16})
+		blockedUser := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 18})
+		repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 22, OwnerID: doer.ID})
+		repo2 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 21, OwnerID: doer.ID})
+		defer user_model.UnblockUser(db.DefaultContext, doer.ID, blockedUser.ID)
+
+		isBlockedUserCollab := func(repo *repo_model.Repository) bool {
+			isCollaborator, err := repo_model.IsCollaborator(db.DefaultContext, repo.ID, blockedUser.ID)
+			require.NoError(t, err)
+			return isCollaborator
+		}
+
+		assert.True(t, isBlockedUserCollab(repo1))
+		assert.True(t, isBlockedUserCollab(repo2))
+
+		require.NoError(t, BlockUser(db.DefaultContext, doer.ID, blockedUser.ID))
+
+		assert.False(t, isBlockedUserCollab(repo1))
+		assert.False(t, isBlockedUserCollab(repo2))
+	})
+
+	t.Run("Pending transfers", func(t *testing.T) {
+		doer := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+		blockedUser := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 3})
+		defer user_model.UnblockUser(db.DefaultContext, doer.ID, blockedUser.ID)
+
+		unittest.AssertExistsIf(t, true, &repo_model.Repository{ID: 3, OwnerID: blockedUser.ID, Status: repo_model.RepositoryPendingTransfer})
+		unittest.AssertExistsIf(t, true, &model.RepoTransfer{ID: 1, RecipientID: doer.ID, DoerID: blockedUser.ID})
+
+		require.NoError(t, BlockUser(db.DefaultContext, doer.ID, blockedUser.ID))
+
+		unittest.AssertExistsIf(t, false, &model.RepoTransfer{ID: 1, RecipientID: doer.ID, DoerID: blockedUser.ID})
+
+		// Don't use AssertExistsIf, as it doesn't include the zero values in the condition such as `repo_model.RepositoryReady`.
+		repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 3, OwnerID: blockedUser.ID})
+		assert.Equal(t, repo_model.RepositoryReady, repo.Status)
+	})
+}
diff --git a/services/user/delete.go b/services/user/delete.go
new file mode 100644
index 0000000..587e3c2
--- /dev/null
+++ b/services/user/delete.go
@@ -0,0 +1,224 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	_ "image/jpeg" // Needed for jpeg support
+
+	actions_model "code.gitea.io/gitea/models/actions"
+	activities_model "code.gitea.io/gitea/models/activities"
+	asymkey_model "code.gitea.io/gitea/models/asymkey"
+	auth_model "code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
+	git_model "code.gitea.io/gitea/models/git"
+	issues_model "code.gitea.io/gitea/models/issues"
+	"code.gitea.io/gitea/models/organization"
+	access_model "code.gitea.io/gitea/models/perm/access"
+	pull_model "code.gitea.io/gitea/models/pull"
+	repo_model "code.gitea.io/gitea/models/repo"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+	issue_service "code.gitea.io/gitea/services/issue"
+
+	"xorm.io/builder"
+)
+
+// deleteUser deletes models associated to an user.
+func deleteUser(ctx context.Context, u *user_model.User, purge bool) (err error) {
+	e := db.GetEngine(ctx)
+
+	// ***** START: Watch *****
+	watchedRepoIDs, err := db.FindIDs(ctx, "watch", "watch.repo_id",
+		builder.Eq{"watch.user_id": u.ID}.
+			And(builder.Neq{"watch.mode": repo_model.WatchModeDont}))
+	if err != nil {
+		return fmt.Errorf("get all watches: %w", err)
+	}
+	if err = db.DecrByIDs(ctx, watchedRepoIDs, "num_watches", new(repo_model.Repository)); err != nil {
+		return fmt.Errorf("decrease repository num_watches: %w", err)
+	}
+	// ***** END: Watch *****
+
+	// ***** START: Star *****
+	starredRepoIDs, err := db.FindIDs(ctx, "star", "star.repo_id",
+		builder.Eq{"star.uid": u.ID})
+	if err != nil {
+		return fmt.Errorf("get all stars: %w", err)
+	} else if err = db.DecrByIDs(ctx, starredRepoIDs, "num_stars", new(repo_model.Repository)); err != nil {
+		return fmt.Errorf("decrease repository num_stars: %w", err)
+	}
+	// ***** END: Star *****
+
+	// ***** START: Follow *****
+	followeeIDs, err := db.FindIDs(ctx, "follow", "follow.follow_id",
+		builder.Eq{"follow.user_id": u.ID})
+	if err != nil {
+		return fmt.Errorf("get all followees: %w", err)
+	} else if err = db.DecrByIDs(ctx, followeeIDs, "num_followers", new(user_model.User)); err != nil {
+		return fmt.Errorf("decrease user num_followers: %w", err)
+	}
+
+	followerIDs, err := db.FindIDs(ctx, "follow", "follow.user_id",
+		builder.Eq{"follow.follow_id": u.ID})
+	if err != nil {
+		return fmt.Errorf("get all followers: %w", err)
+	} else if err = db.DecrByIDs(ctx, followerIDs, "num_following", new(user_model.User)); err != nil {
+		return fmt.Errorf("decrease user num_following: %w", err)
+	}
+	// ***** END: Follow *****
+
+	if err = db.DeleteBeans(ctx,
+		&auth_model.AccessToken{UID: u.ID},
+		&repo_model.Collaboration{UserID: u.ID},
+		&access_model.Access{UserID: u.ID},
+		&repo_model.Watch{UserID: u.ID},
+		&repo_model.Star{UID: u.ID},
+		&user_model.Follow{UserID: u.ID},
+		&user_model.Follow{FollowID: u.ID},
+		&activities_model.Action{UserID: u.ID},
+		&issues_model.IssueUser{UID: u.ID},
+		&user_model.EmailAddress{UID: u.ID},
+		&user_model.UserOpenID{UID: u.ID},
+		&issues_model.Reaction{UserID: u.ID},
+		&organization.TeamUser{UID: u.ID},
+		&issues_model.Stopwatch{UserID: u.ID},
+		&user_model.Setting{UserID: u.ID},
+		&user_model.UserBadge{UserID: u.ID},
+		&pull_model.AutoMerge{DoerID: u.ID},
+		&pull_model.ReviewState{UserID: u.ID},
+		&user_model.Redirect{RedirectUserID: u.ID},
+		&actions_model.ActionRunner{OwnerID: u.ID},
+		&user_model.BlockedUser{BlockID: u.ID},
+		&user_model.BlockedUser{UserID: u.ID},
+		&actions_model.ActionRunnerToken{OwnerID: u.ID},
+		&auth_model.AuthorizationToken{UID: u.ID},
+	); err != nil {
+		return fmt.Errorf("deleteBeans: %w", err)
+	}
+
+	if err := auth_model.DeleteOAuth2RelictsByUserID(ctx, u.ID); err != nil {
+		return err
+	}
+
+	if purge || (setting.Service.UserDeleteWithCommentsMaxTime != 0 &&
+		u.CreatedUnix.AsTime().Add(setting.Service.UserDeleteWithCommentsMaxTime).After(time.Now())) {
+		// Delete Comments
+		const batchSize = 50
+		for {
+			comments := make([]*issues_model.Comment, 0, batchSize)
+			if err = e.Where("type=? AND poster_id=?", issues_model.CommentTypeComment, u.ID).Limit(batchSize, 0).Find(&comments); err != nil {
+				return err
+			}
+			if len(comments) == 0 {
+				break
+			}
+
+			for _, comment := range comments {
+				if err = issues_model.DeleteComment(ctx, comment); err != nil {
+					return err
+				}
+			}
+		}
+
+		// Delete Reactions
+		if err = issues_model.DeleteReaction(ctx, &issues_model.ReactionOptions{DoerID: u.ID}); err != nil {
+			return err
+		}
+	}
+
+	// ***** START: Issues *****
+	if purge {
+		const batchSize = 50
+
+		for {
+			issues := make([]*issues_model.Issue, 0, batchSize)
+			if err = e.Where("poster_id=?", u.ID).Limit(batchSize, 0).Find(&issues); err != nil {
+				return err
+			}
+			if len(issues) == 0 {
+				break
+			}
+
+			for _, issue := range issues {
+				// NOTE: Don't open git repositories just to remove the reference data,
+				// `git gc` is able to remove that reference which is run as a cron job
+				// by default. Also use the deleted user as doer to delete the issue.
+				if err = issue_service.DeleteIssue(ctx, u, nil, issue); err != nil {
+					return err
+				}
+			}
+		}
+	}
+	// ***** END: Issues *****
+
+	// ***** START: Branch Protections *****
+	{
+		const batchSize = 50
+		for start := 0; ; start += batchSize {
+			protections := make([]*git_model.ProtectedBranch, 0, batchSize)
+			// @perf: We can't filter on DB side by u.ID, as those IDs are serialized as JSON strings.
+			//   We could filter down with `WHERE repo_id IN (reposWithPushPermission(u))`,
+			//   though that query will be quite complex and tricky to maintain (compare `getRepoAssignees()`).
+			// Also, as we didn't update branch protections when removing entries from `access` table,
+			//   it's safer to iterate all protected branches.
+			if err = e.Limit(batchSize, start).Find(&protections); err != nil {
+				return fmt.Errorf("findProtectedBranches: %w", err)
+			}
+			if len(protections) == 0 {
+				break
+			}
+			for _, p := range protections {
+				if err := git_model.RemoveUserIDFromProtectedBranch(ctx, p, u.ID); err != nil {
+					return err
+				}
+			}
+		}
+	}
+	// ***** END: Branch Protections *****
+
+	// ***** START: PublicKey *****
+	if _, err = db.DeleteByBean(ctx, &asymkey_model.PublicKey{OwnerID: u.ID}); err != nil {
+		return fmt.Errorf("deletePublicKeys: %w", err)
+	}
+	// ***** END: PublicKey *****
+
+	// ***** START: GPGPublicKey *****
+	keys, err := db.Find[asymkey_model.GPGKey](ctx, asymkey_model.FindGPGKeyOptions{
+		OwnerID: u.ID,
+	})
+	if err != nil {
+		return fmt.Errorf("ListGPGKeys: %w", err)
+	}
+	// Delete GPGKeyImport(s).
+	for _, key := range keys {
+		if _, err = db.DeleteByBean(ctx, &asymkey_model.GPGKeyImport{KeyID: key.KeyID}); err != nil {
+			return fmt.Errorf("deleteGPGKeyImports: %w", err)
+		}
+	}
+	if _, err = db.DeleteByBean(ctx, &asymkey_model.GPGKey{OwnerID: u.ID}); err != nil {
+		return fmt.Errorf("deleteGPGKeys: %w", err)
+	}
+	// ***** END: GPGPublicKey *****
+
+	// Clear assignee.
+	if _, err = db.DeleteByBean(ctx, &issues_model.IssueAssignees{AssigneeID: u.ID}); err != nil {
+		return fmt.Errorf("clear assignee: %w", err)
+	}
+
+	// ***** START: ExternalLoginUser *****
+	if err = user_model.RemoveAllAccountLinks(ctx, u); err != nil {
+		return fmt.Errorf("ExternalLoginUser: %w", err)
+	}
+	// ***** END: ExternalLoginUser *****
+
+	if _, err = db.DeleteByID[user_model.User](ctx, u.ID); err != nil {
+		return fmt.Errorf("delete: %w", err)
+	}
+
+	return nil
+}
diff --git a/services/user/email.go b/services/user/email.go
new file mode 100644
index 0000000..e872526
--- /dev/null
+++ b/services/user/email.go
@@ -0,0 +1,232 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"context"
+	"errors"
+	"strings"
+
+	"code.gitea.io/gitea/models/db"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/services/mailer"
+)
+
+// AdminAddOrSetPrimaryEmailAddress is used by admins to add or set a user's primary email address
+func AdminAddOrSetPrimaryEmailAddress(ctx context.Context, u *user_model.User, emailStr string) error {
+	if strings.EqualFold(u.Email, emailStr) {
+		return nil
+	}
+
+	if err := user_model.ValidateEmailForAdmin(emailStr); err != nil {
+		return err
+	}
+
+	// Check if address exists already
+	email, err := user_model.GetEmailAddressByEmail(ctx, emailStr)
+	if err != nil && !errors.Is(err, util.ErrNotExist) {
+		return err
+	}
+	if email != nil && email.UID != u.ID {
+		return user_model.ErrEmailAlreadyUsed{Email: emailStr}
+	}
+
+	// Update old primary address
+	primary, err := user_model.GetPrimaryEmailAddressOfUser(ctx, u.ID)
+	if err != nil {
+		return err
+	}
+
+	primary.IsPrimary = false
+	if err := user_model.UpdateEmailAddress(ctx, primary); err != nil {
+		return err
+	}
+
+	// Insert new or update existing address
+	if email != nil {
+		email.IsPrimary = true
+		email.IsActivated = true
+		if err := user_model.UpdateEmailAddress(ctx, email); err != nil {
+			return err
+		}
+	} else {
+		email = &user_model.EmailAddress{
+			UID:         u.ID,
+			Email:       emailStr,
+			IsActivated: true,
+			IsPrimary:   true,
+		}
+		if _, err := user_model.InsertEmailAddress(ctx, email); err != nil {
+			return err
+		}
+	}
+
+	u.Email = emailStr
+
+	return user_model.UpdateUserCols(ctx, u, "email")
+}
+
+func ReplacePrimaryEmailAddress(ctx context.Context, u *user_model.User, emailStr string) error {
+	if strings.EqualFold(u.Email, emailStr) {
+		return nil
+	}
+
+	if err := user_model.ValidateEmail(emailStr); err != nil {
+		return err
+	}
+
+	if !u.IsOrganization() {
+		// Check if address exists already
+		email, err := user_model.GetEmailAddressByEmail(ctx, emailStr)
+		if err != nil && !errors.Is(err, util.ErrNotExist) {
+			return err
+		}
+		if email != nil {
+			if email.IsPrimary && email.UID == u.ID {
+				return nil
+			}
+			return user_model.ErrEmailAlreadyUsed{Email: emailStr}
+		}
+
+		// Remove old primary address
+		primary, err := user_model.GetPrimaryEmailAddressOfUser(ctx, u.ID)
+		if err != nil {
+			return err
+		}
+		if _, err := db.DeleteByID[user_model.EmailAddress](ctx, primary.ID); err != nil {
+			return err
+		}
+
+		// Insert new primary address
+		email = &user_model.EmailAddress{
+			UID:         u.ID,
+			Email:       emailStr,
+			IsActivated: true,
+			IsPrimary:   true,
+		}
+		if _, err := user_model.InsertEmailAddress(ctx, email); err != nil {
+			return err
+		}
+	}
+
+	u.Email = emailStr
+
+	return user_model.UpdateUserCols(ctx, u, "email")
+}
+
+func AddEmailAddresses(ctx context.Context, u *user_model.User, emails []string) error {
+	for _, emailStr := range emails {
+		if err := user_model.ValidateEmail(emailStr); err != nil {
+			return err
+		}
+
+		// Check if address exists already
+		email, err := user_model.GetEmailAddressByEmail(ctx, emailStr)
+		if err != nil && !errors.Is(err, util.ErrNotExist) {
+			return err
+		}
+		if email != nil {
+			return user_model.ErrEmailAlreadyUsed{Email: emailStr}
+		}
+
+		// Insert new address
+		email = &user_model.EmailAddress{
+			UID:         u.ID,
+			Email:       emailStr,
+			IsActivated: !setting.Service.RegisterEmailConfirm,
+			IsPrimary:   false,
+		}
+		if _, err := user_model.InsertEmailAddress(ctx, email); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// ReplaceInactivePrimaryEmail replaces the primary email of a given user, even if the primary is not yet activated.
+func ReplaceInactivePrimaryEmail(ctx context.Context, oldEmail string, email *user_model.EmailAddress) error {
+	user := &user_model.User{}
+	has, err := db.GetEngine(ctx).ID(email.UID).Get(user)
+	if err != nil {
+		return err
+	} else if !has {
+		return user_model.ErrUserNotExist{
+			UID: email.UID,
+		}
+	}
+
+	err = AddEmailAddresses(ctx, user, []string{email.Email})
+	if err != nil {
+		return err
+	}
+
+	err = MakeEmailAddressPrimary(ctx, user, email, false)
+	if err != nil {
+		return err
+	}
+
+	return DeleteEmailAddresses(ctx, user, []string{oldEmail})
+}
+
+func DeleteEmailAddresses(ctx context.Context, u *user_model.User, emails []string) error {
+	for _, emailStr := range emails {
+		// Check if address exists
+		email, err := user_model.GetEmailAddressOfUser(ctx, emailStr, u.ID)
+		if err != nil {
+			return err
+		}
+		if email.IsPrimary {
+			return user_model.ErrPrimaryEmailCannotDelete{Email: emailStr}
+		}
+
+		// Remove address
+		if _, err := db.DeleteByID[user_model.EmailAddress](ctx, email.ID); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func MakeEmailAddressPrimary(ctx context.Context, u *user_model.User, newPrimaryEmail *user_model.EmailAddress, notify bool) error {
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+	sess := db.GetEngine(ctx)
+
+	oldPrimaryEmail := u.Email
+
+	// 1. Update user table
+	u.Email = newPrimaryEmail.Email
+	if _, err = sess.ID(u.ID).Cols("email").Update(u); err != nil {
+		return err
+	}
+
+	// 2. Update old primary email
+	if _, err = sess.Where("uid=? AND is_primary=?", u.ID, true).Cols("is_primary").Update(&user_model.EmailAddress{
+		IsPrimary: false,
+	}); err != nil {
+		return err
+	}
+
+	// 3. update new primary email
+	newPrimaryEmail.IsPrimary = true
+	if _, err = sess.ID(newPrimaryEmail.ID).Cols("is_primary").Update(newPrimaryEmail); err != nil {
+		return err
+	}
+
+	if err := committer.Commit(); err != nil {
+		return err
+	}
+
+	if notify {
+		return mailer.SendPrimaryMailChange(u, oldPrimaryEmail)
+	}
+	return nil
+}
diff --git a/services/user/email_test.go b/services/user/email_test.go
new file mode 100644
index 0000000..86f31a8
--- /dev/null
+++ b/services/user/email_test.go
@@ -0,0 +1,178 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	organization_model "code.gitea.io/gitea/models/organization"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/gobwas/glob"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAdminAddOrSetPrimaryEmailAddress(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 27})
+
+	emails, err := user_model.GetEmailAddresses(db.DefaultContext, user.ID)
+	require.NoError(t, err)
+	assert.Len(t, emails, 1)
+
+	primary, err := user_model.GetPrimaryEmailAddressOfUser(db.DefaultContext, user.ID)
+	require.NoError(t, err)
+	assert.NotEqual(t, "new-primary@example.com", primary.Email)
+	assert.Equal(t, user.Email, primary.Email)
+
+	require.NoError(t, AdminAddOrSetPrimaryEmailAddress(db.DefaultContext, user, "new-primary@example.com"))
+
+	primary, err = user_model.GetPrimaryEmailAddressOfUser(db.DefaultContext, user.ID)
+	require.NoError(t, err)
+	assert.Equal(t, "new-primary@example.com", primary.Email)
+	assert.Equal(t, user.Email, primary.Email)
+
+	emails, err = user_model.GetEmailAddresses(db.DefaultContext, user.ID)
+	require.NoError(t, err)
+	assert.Len(t, emails, 2)
+
+	setting.Service.EmailDomainAllowList = []glob.Glob{glob.MustCompile("example.org")}
+	defer func() {
+		setting.Service.EmailDomainAllowList = []glob.Glob{}
+	}()
+
+	require.NoError(t, AdminAddOrSetPrimaryEmailAddress(db.DefaultContext, user, "new-primary2@example2.com"))
+
+	primary, err = user_model.GetPrimaryEmailAddressOfUser(db.DefaultContext, user.ID)
+	require.NoError(t, err)
+	assert.Equal(t, "new-primary2@example2.com", primary.Email)
+	assert.Equal(t, user.Email, primary.Email)
+
+	require.NoError(t, AdminAddOrSetPrimaryEmailAddress(db.DefaultContext, user, "user27@example.com"))
+
+	primary, err = user_model.GetPrimaryEmailAddressOfUser(db.DefaultContext, user.ID)
+	require.NoError(t, err)
+	assert.Equal(t, "user27@example.com", primary.Email)
+	assert.Equal(t, user.Email, primary.Email)
+
+	emails, err = user_model.GetEmailAddresses(db.DefaultContext, user.ID)
+	require.NoError(t, err)
+	assert.Len(t, emails, 3)
+}
+
+func TestReplacePrimaryEmailAddress(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	t.Run("User", func(t *testing.T) {
+		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 13})
+
+		emails, err := user_model.GetEmailAddresses(db.DefaultContext, user.ID)
+		require.NoError(t, err)
+		assert.Len(t, emails, 1)
+
+		primary, err := user_model.GetPrimaryEmailAddressOfUser(db.DefaultContext, user.ID)
+		require.NoError(t, err)
+		assert.NotEqual(t, "primary-13@example.com", primary.Email)
+		assert.Equal(t, user.Email, primary.Email)
+
+		require.NoError(t, ReplacePrimaryEmailAddress(db.DefaultContext, user, "primary-13@example.com"))
+
+		primary, err = user_model.GetPrimaryEmailAddressOfUser(db.DefaultContext, user.ID)
+		require.NoError(t, err)
+		assert.Equal(t, "primary-13@example.com", primary.Email)
+		assert.Equal(t, user.Email, primary.Email)
+
+		emails, err = user_model.GetEmailAddresses(db.DefaultContext, user.ID)
+		require.NoError(t, err)
+		assert.Len(t, emails, 1)
+
+		require.NoError(t, ReplacePrimaryEmailAddress(db.DefaultContext, user, "primary-13@example.com"))
+	})
+
+	t.Run("Organization", func(t *testing.T) {
+		org := unittest.AssertExistsAndLoadBean(t, &organization_model.Organization{ID: 3})
+
+		assert.Equal(t, "org3@example.com", org.Email)
+
+		require.NoError(t, ReplacePrimaryEmailAddress(db.DefaultContext, org.AsUser(), "primary-org@example.com"))
+
+		assert.Equal(t, "primary-org@example.com", org.Email)
+	})
+}
+
+func TestAddEmailAddresses(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+	require.Error(t, AddEmailAddresses(db.DefaultContext, user, []string{" invalid email "}))
+
+	emails := []string{"user1234@example.com", "user5678@example.com"}
+
+	require.NoError(t, AddEmailAddresses(db.DefaultContext, user, emails))
+
+	err := AddEmailAddresses(db.DefaultContext, user, emails)
+	require.Error(t, err)
+	assert.True(t, user_model.IsErrEmailAlreadyUsed(err))
+}
+
+func TestReplaceInactivePrimaryEmail(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	email := &user_model.EmailAddress{
+		Email: "user9999999@example.com",
+		UID:   9999999,
+	}
+	err := ReplaceInactivePrimaryEmail(db.DefaultContext, "user10@example.com", email)
+	require.Error(t, err)
+	assert.True(t, user_model.IsErrUserNotExist(err))
+
+	email = &user_model.EmailAddress{
+		Email: "user201@example.com",
+		UID:   10,
+	}
+	err = ReplaceInactivePrimaryEmail(db.DefaultContext, "user10@example.com", email)
+	require.NoError(t, err)
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 10})
+	assert.Equal(t, "user201@example.com", user.Email)
+}
+
+func TestDeleteEmailAddresses(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+
+	emails := []string{"user2-2@example.com"}
+
+	err := DeleteEmailAddresses(db.DefaultContext, user, emails)
+	require.NoError(t, err)
+
+	err = DeleteEmailAddresses(db.DefaultContext, user, emails)
+	require.Error(t, err)
+	assert.True(t, user_model.IsErrEmailAddressNotExist(err))
+
+	emails = []string{"user2@example.com"}
+
+	err = DeleteEmailAddresses(db.DefaultContext, user, emails)
+	require.Error(t, err)
+	assert.True(t, user_model.IsErrPrimaryEmailCannotDelete(err))
+}
+
+func TestMakeEmailAddressPrimary(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	newPrimaryEmail := unittest.AssertExistsAndLoadBean(t, &user_model.EmailAddress{ID: 35, UID: user.ID}, "is_primary = false")
+
+	require.NoError(t, MakeEmailAddressPrimary(db.DefaultContext, user, newPrimaryEmail, false))
+
+	unittest.AssertExistsIf(t, true, &user_model.User{ID: 2, Email: newPrimaryEmail.Email})
+	unittest.AssertExistsIf(t, true, &user_model.EmailAddress{ID: 3, UID: user.ID}, "is_primary = false")
+	unittest.AssertExistsIf(t, true, &user_model.EmailAddress{ID: 35, UID: user.ID, IsPrimary: true})
+}
diff --git a/services/user/update.go b/services/user/update.go
new file mode 100644
index 0000000..26c9050
--- /dev/null
+++ b/services/user/update.go
@@ -0,0 +1,233 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models"
+	auth_model "code.gitea.io/gitea/models/auth"
+	user_model "code.gitea.io/gitea/models/user"
+	password_module "code.gitea.io/gitea/modules/auth/password"
+	"code.gitea.io/gitea/modules/optional"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/services/mailer"
+)
+
+type UpdateOptions struct {
+	KeepEmailPrivate             optional.Option[bool]
+	FullName                     optional.Option[string]
+	Website                      optional.Option[string]
+	Location                     optional.Option[string]
+	Description                  optional.Option[string]
+	Pronouns                     optional.Option[string]
+	AllowGitHook                 optional.Option[bool]
+	AllowImportLocal             optional.Option[bool]
+	MaxRepoCreation              optional.Option[int]
+	IsRestricted                 optional.Option[bool]
+	Visibility                   optional.Option[structs.VisibleType]
+	KeepActivityPrivate          optional.Option[bool]
+	Language                     optional.Option[string]
+	Theme                        optional.Option[string]
+	DiffViewStyle                optional.Option[string]
+	AllowCreateOrganization      optional.Option[bool]
+	IsActive                     optional.Option[bool]
+	IsAdmin                      optional.Option[bool]
+	EmailNotificationsPreference optional.Option[string]
+	SetLastLogin                 bool
+	RepoAdminChangeTeamAccess    optional.Option[bool]
+	EnableRepoUnitHints          optional.Option[bool]
+}
+
+func UpdateUser(ctx context.Context, u *user_model.User, opts *UpdateOptions) error {
+	cols := make([]string, 0, 20)
+
+	if opts.KeepEmailPrivate.Has() {
+		u.KeepEmailPrivate = opts.KeepEmailPrivate.Value()
+
+		cols = append(cols, "keep_email_private")
+	}
+
+	if opts.FullName.Has() {
+		u.FullName = opts.FullName.Value()
+
+		cols = append(cols, "full_name")
+	}
+	if opts.Pronouns.Has() {
+		u.Pronouns = opts.Pronouns.Value()
+
+		cols = append(cols, "pronouns")
+	}
+	if opts.Website.Has() {
+		u.Website = opts.Website.Value()
+
+		cols = append(cols, "website")
+	}
+	if opts.Location.Has() {
+		u.Location = opts.Location.Value()
+
+		cols = append(cols, "location")
+	}
+	if opts.Description.Has() {
+		u.Description = opts.Description.Value()
+
+		cols = append(cols, "description")
+	}
+	if opts.Language.Has() {
+		u.Language = opts.Language.Value()
+
+		cols = append(cols, "language")
+	}
+	if opts.Theme.Has() {
+		u.Theme = opts.Theme.Value()
+
+		cols = append(cols, "theme")
+	}
+	if opts.DiffViewStyle.Has() {
+		u.DiffViewStyle = opts.DiffViewStyle.Value()
+
+		cols = append(cols, "diff_view_style")
+	}
+	if opts.EnableRepoUnitHints.Has() {
+		u.EnableRepoUnitHints = opts.EnableRepoUnitHints.Value()
+
+		cols = append(cols, "enable_repo_unit_hints")
+	}
+
+	if opts.AllowGitHook.Has() {
+		u.AllowGitHook = opts.AllowGitHook.Value()
+
+		cols = append(cols, "allow_git_hook")
+	}
+	if opts.AllowImportLocal.Has() {
+		u.AllowImportLocal = opts.AllowImportLocal.Value()
+
+		cols = append(cols, "allow_import_local")
+	}
+
+	if opts.MaxRepoCreation.Has() {
+		u.MaxRepoCreation = opts.MaxRepoCreation.Value()
+
+		cols = append(cols, "max_repo_creation")
+	}
+
+	if opts.IsActive.Has() {
+		u.IsActive = opts.IsActive.Value()
+
+		cols = append(cols, "is_active")
+	}
+	if opts.IsRestricted.Has() {
+		u.IsRestricted = opts.IsRestricted.Value()
+
+		cols = append(cols, "is_restricted")
+	}
+	if opts.IsAdmin.Has() {
+		if !opts.IsAdmin.Value() && user_model.IsLastAdminUser(ctx, u) {
+			return models.ErrDeleteLastAdminUser{UID: u.ID}
+		}
+
+		u.IsAdmin = opts.IsAdmin.Value()
+
+		cols = append(cols, "is_admin")
+	}
+
+	if opts.Visibility.Has() {
+		if !u.IsOrganization() && !setting.Service.AllowedUserVisibilityModesSlice.IsAllowedVisibility(opts.Visibility.Value()) {
+			return fmt.Errorf("visibility mode not allowed: %s", opts.Visibility.Value().String())
+		}
+		u.Visibility = opts.Visibility.Value()
+
+		cols = append(cols, "visibility")
+	}
+	if opts.KeepActivityPrivate.Has() {
+		u.KeepActivityPrivate = opts.KeepActivityPrivate.Value()
+
+		cols = append(cols, "keep_activity_private")
+	}
+
+	if opts.AllowCreateOrganization.Has() {
+		u.AllowCreateOrganization = opts.AllowCreateOrganization.Value()
+
+		cols = append(cols, "allow_create_organization")
+	}
+	if opts.RepoAdminChangeTeamAccess.Has() {
+		u.RepoAdminChangeTeamAccess = opts.RepoAdminChangeTeamAccess.Value()
+
+		cols = append(cols, "repo_admin_change_team_access")
+	}
+
+	if opts.EmailNotificationsPreference.Has() {
+		u.EmailNotificationsPreference = opts.EmailNotificationsPreference.Value()
+
+		cols = append(cols, "email_notifications_preference")
+	}
+
+	if opts.SetLastLogin {
+		u.SetLastLogin()
+
+		cols = append(cols, "last_login_unix")
+	}
+
+	return user_model.UpdateUserCols(ctx, u, cols...)
+}
+
+type UpdateAuthOptions struct {
+	LoginSource        optional.Option[int64]
+	LoginName          optional.Option[string]
+	Password           optional.Option[string]
+	MustChangePassword optional.Option[bool]
+	ProhibitLogin      optional.Option[bool]
+}
+
+func UpdateAuth(ctx context.Context, u *user_model.User, opts *UpdateAuthOptions) error {
+	if opts.LoginSource.Has() {
+		source, err := auth_model.GetSourceByID(ctx, opts.LoginSource.Value())
+		if err != nil {
+			return err
+		}
+
+		u.LoginType = source.Type
+		u.LoginSource = source.ID
+	}
+	if opts.LoginName.Has() {
+		u.LoginName = opts.LoginName.Value()
+	}
+
+	if opts.Password.Has() && (u.IsLocal() || u.IsOAuth2()) {
+		password := opts.Password.Value()
+
+		if len(password) < setting.MinPasswordLength {
+			return password_module.ErrMinLength
+		}
+		if !password_module.IsComplexEnough(password) {
+			return password_module.ErrComplexity
+		}
+		if err := password_module.IsPwned(ctx, password); err != nil {
+			return err
+		}
+
+		if err := u.SetPassword(password); err != nil {
+			return err
+		}
+	}
+
+	if opts.MustChangePassword.Has() {
+		u.MustChangePassword = opts.MustChangePassword.Value()
+	}
+	if opts.ProhibitLogin.Has() {
+		u.ProhibitLogin = opts.ProhibitLogin.Value()
+	}
+
+	if err := user_model.UpdateUserCols(ctx, u, "login_type", "login_source", "login_name", "passwd", "passwd_hash_algo", "salt", "must_change_password", "prohibit_login"); err != nil {
+		return err
+	}
+
+	if opts.Password.Has() {
+		return mailer.SendPasswordChange(u)
+	}
+
+	return nil
+}
diff --git a/services/user/update_test.go b/services/user/update_test.go
new file mode 100644
index 0000000..11379d4
--- /dev/null
+++ b/services/user/update_test.go
@@ -0,0 +1,121 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	password_module "code.gitea.io/gitea/modules/auth/password"
+	"code.gitea.io/gitea/modules/optional"
+	"code.gitea.io/gitea/modules/structs"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestUpdateUser(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	admin := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+
+	require.Error(t, UpdateUser(db.DefaultContext, admin, &UpdateOptions{
+		IsAdmin: optional.Some(false),
+	}))
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 28})
+
+	opts := &UpdateOptions{
+		KeepEmailPrivate:             optional.Some(false),
+		FullName:                     optional.Some("Changed Name"),
+		Website:                      optional.Some("https://gitea.com/"),
+		Location:                     optional.Some("location"),
+		Description:                  optional.Some("description"),
+		AllowGitHook:                 optional.Some(true),
+		AllowImportLocal:             optional.Some(true),
+		MaxRepoCreation:              optional.Some(10),
+		IsRestricted:                 optional.Some(true),
+		IsActive:                     optional.Some(false),
+		IsAdmin:                      optional.Some(true),
+		Visibility:                   optional.Some(structs.VisibleTypePrivate),
+		KeepActivityPrivate:          optional.Some(true),
+		Language:                     optional.Some("lang"),
+		Theme:                        optional.Some("theme"),
+		DiffViewStyle:                optional.Some("split"),
+		AllowCreateOrganization:      optional.Some(false),
+		EmailNotificationsPreference: optional.Some("disabled"),
+		SetLastLogin:                 true,
+	}
+	require.NoError(t, UpdateUser(db.DefaultContext, user, opts))
+
+	assert.Equal(t, opts.KeepEmailPrivate.Value(), user.KeepEmailPrivate)
+	assert.Equal(t, opts.FullName.Value(), user.FullName)
+	assert.Equal(t, opts.Website.Value(), user.Website)
+	assert.Equal(t, opts.Location.Value(), user.Location)
+	assert.Equal(t, opts.Description.Value(), user.Description)
+	assert.Equal(t, opts.AllowGitHook.Value(), user.AllowGitHook)
+	assert.Equal(t, opts.AllowImportLocal.Value(), user.AllowImportLocal)
+	assert.Equal(t, opts.MaxRepoCreation.Value(), user.MaxRepoCreation)
+	assert.Equal(t, opts.IsRestricted.Value(), user.IsRestricted)
+	assert.Equal(t, opts.IsActive.Value(), user.IsActive)
+	assert.Equal(t, opts.IsAdmin.Value(), user.IsAdmin)
+	assert.Equal(t, opts.Visibility.Value(), user.Visibility)
+	assert.Equal(t, opts.KeepActivityPrivate.Value(), user.KeepActivityPrivate)
+	assert.Equal(t, opts.Language.Value(), user.Language)
+	assert.Equal(t, opts.Theme.Value(), user.Theme)
+	assert.Equal(t, opts.DiffViewStyle.Value(), user.DiffViewStyle)
+	assert.Equal(t, opts.AllowCreateOrganization.Value(), user.AllowCreateOrganization)
+	assert.Equal(t, opts.EmailNotificationsPreference.Value(), user.EmailNotificationsPreference)
+
+	user = unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 28})
+	assert.Equal(t, opts.KeepEmailPrivate.Value(), user.KeepEmailPrivate)
+	assert.Equal(t, opts.FullName.Value(), user.FullName)
+	assert.Equal(t, opts.Website.Value(), user.Website)
+	assert.Equal(t, opts.Location.Value(), user.Location)
+	assert.Equal(t, opts.Description.Value(), user.Description)
+	assert.Equal(t, opts.AllowGitHook.Value(), user.AllowGitHook)
+	assert.Equal(t, opts.AllowImportLocal.Value(), user.AllowImportLocal)
+	assert.Equal(t, opts.MaxRepoCreation.Value(), user.MaxRepoCreation)
+	assert.Equal(t, opts.IsRestricted.Value(), user.IsRestricted)
+	assert.Equal(t, opts.IsActive.Value(), user.IsActive)
+	assert.Equal(t, opts.IsAdmin.Value(), user.IsAdmin)
+	assert.Equal(t, opts.Visibility.Value(), user.Visibility)
+	assert.Equal(t, opts.KeepActivityPrivate.Value(), user.KeepActivityPrivate)
+	assert.Equal(t, opts.Language.Value(), user.Language)
+	assert.Equal(t, opts.Theme.Value(), user.Theme)
+	assert.Equal(t, opts.DiffViewStyle.Value(), user.DiffViewStyle)
+	assert.Equal(t, opts.AllowCreateOrganization.Value(), user.AllowCreateOrganization)
+	assert.Equal(t, opts.EmailNotificationsPreference.Value(), user.EmailNotificationsPreference)
+}
+
+func TestUpdateAuth(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 28})
+	userCopy := *user
+
+	require.NoError(t, UpdateAuth(db.DefaultContext, user, &UpdateAuthOptions{
+		LoginName: optional.Some("new-login"),
+	}))
+	assert.Equal(t, "new-login", user.LoginName)
+
+	require.NoError(t, UpdateAuth(db.DefaultContext, user, &UpdateAuthOptions{
+		Password:           optional.Some("%$DRZUVB576tfzgu"),
+		MustChangePassword: optional.Some(true),
+	}))
+	assert.True(t, user.MustChangePassword)
+	assert.NotEqual(t, userCopy.Passwd, user.Passwd)
+	assert.NotEqual(t, userCopy.Salt, user.Salt)
+
+	require.NoError(t, UpdateAuth(db.DefaultContext, user, &UpdateAuthOptions{
+		ProhibitLogin: optional.Some(true),
+	}))
+	assert.True(t, user.ProhibitLogin)
+
+	require.ErrorIs(t, UpdateAuth(db.DefaultContext, user, &UpdateAuthOptions{
+		Password: optional.Some("aaaa"),
+	}), password_module.ErrMinLength)
+}
diff --git a/services/user/user.go b/services/user/user.go
new file mode 100644
index 0000000..abaeb88
--- /dev/null
+++ b/services/user/user.go
@@ -0,0 +1,332 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"code.gitea.io/gitea/models"
+	asymkey_model "code.gitea.io/gitea/models/asymkey"
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	packages_model "code.gitea.io/gitea/models/packages"
+	repo_model "code.gitea.io/gitea/models/repo"
+	system_model "code.gitea.io/gitea/models/system"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/eventsource"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/storage"
+	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/services/agit"
+	org_service "code.gitea.io/gitea/services/org"
+	"code.gitea.io/gitea/services/packages"
+	container_service "code.gitea.io/gitea/services/packages/container"
+	repo_service "code.gitea.io/gitea/services/repository"
+)
+
+// RenameUser renames a user
+func RenameUser(ctx context.Context, u *user_model.User, newUserName string) error {
+	// Non-local users are not allowed to change their username.
+	if !u.IsOrganization() && !u.IsLocal() {
+		return user_model.ErrUserIsNotLocal{
+			UID:  u.ID,
+			Name: u.Name,
+		}
+	}
+
+	if newUserName == u.Name {
+		return nil
+	}
+
+	if err := user_model.IsUsableUsername(newUserName); err != nil {
+		return err
+	}
+
+	onlyCapitalization := strings.EqualFold(newUserName, u.Name)
+	oldUserName := u.Name
+
+	if onlyCapitalization {
+		u.Name = newUserName
+		if err := user_model.UpdateUserCols(ctx, u, "name"); err != nil {
+			u.Name = oldUserName
+			return err
+		}
+		return repo_model.UpdateRepositoryOwnerNames(ctx, u.ID, newUserName)
+	}
+
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	isExist, err := user_model.IsUserExist(ctx, u.ID, newUserName)
+	if err != nil {
+		return err
+	}
+	if isExist {
+		return user_model.ErrUserAlreadyExist{
+			Name: newUserName,
+		}
+	}
+
+	if err = repo_model.UpdateRepositoryOwnerName(ctx, oldUserName, newUserName); err != nil {
+		return err
+	}
+
+	if err = user_model.NewUserRedirect(ctx, u.ID, oldUserName, newUserName); err != nil {
+		return err
+	}
+
+	if err := agit.UserNameChanged(ctx, u, newUserName); err != nil {
+		return err
+	}
+	if err := container_service.UpdateRepositoryNames(ctx, u, newUserName); err != nil {
+		return err
+	}
+
+	u.Name = newUserName
+	u.LowerName = strings.ToLower(newUserName)
+	if err := user_model.UpdateUserCols(ctx, u, "name", "lower_name"); err != nil {
+		u.Name = oldUserName
+		u.LowerName = strings.ToLower(oldUserName)
+		return err
+	}
+
+	// Do not fail if directory does not exist
+	if err = util.Rename(user_model.UserPath(oldUserName), user_model.UserPath(newUserName)); err != nil && !os.IsNotExist(err) {
+		u.Name = oldUserName
+		u.LowerName = strings.ToLower(oldUserName)
+		return fmt.Errorf("rename user directory: %w", err)
+	}
+
+	if err = committer.Commit(); err != nil {
+		u.Name = oldUserName
+		u.LowerName = strings.ToLower(oldUserName)
+		if err2 := util.Rename(user_model.UserPath(newUserName), user_model.UserPath(oldUserName)); err2 != nil && !os.IsNotExist(err2) {
+			log.Critical("Unable to rollback directory change during failed username change from: %s to: %s. DB Error: %v. Filesystem Error: %v", oldUserName, newUserName, err, err2)
+			return fmt.Errorf("failed to rollback directory change during failed username change from: %s to: %s. DB Error: %w. Filesystem Error: %v", oldUserName, newUserName, err, err2)
+		}
+		return err
+	}
+	return nil
+}
+
+// DeleteUser completely and permanently deletes everything of a user,
+// but issues/comments/pulls will be kept and shown as someone has been deleted,
+// unless the user is younger than USER_DELETE_WITH_COMMENTS_MAX_DAYS.
+func DeleteUser(ctx context.Context, u *user_model.User, purge bool) error {
+	if u.IsOrganization() {
+		return fmt.Errorf("%s is an organization not a user", u.Name)
+	}
+
+	if user_model.IsLastAdminUser(ctx, u) {
+		return models.ErrDeleteLastAdminUser{UID: u.ID}
+	}
+
+	hasSSHKey, err := db.GetEngine(ctx).Where("owner_id = ? AND type != ?", u.ID, asymkey_model.KeyTypePrincipal).Table("public_key").Exist()
+	if err != nil {
+		return err
+	}
+
+	hasPrincipialSSHKey, err := db.GetEngine(ctx).Where("owner_id = ? AND type = ?", u.ID, asymkey_model.KeyTypePrincipal).Table("public_key").Exist()
+	if err != nil {
+		return err
+	}
+
+	if purge {
+		// Disable the user first
+		// NOTE: This is deliberately not within a transaction as it must disable the user immediately to prevent any further action by the user to be purged.
+		if err := user_model.UpdateUserCols(ctx, &user_model.User{
+			ID:              u.ID,
+			IsActive:        false,
+			IsRestricted:    true,
+			IsAdmin:         false,
+			ProhibitLogin:   true,
+			Passwd:          "",
+			Salt:            "",
+			PasswdHashAlgo:  "",
+			MaxRepoCreation: 0,
+		}, "is_active", "is_restricted", "is_admin", "prohibit_login", "max_repo_creation", "passwd", "salt", "passwd_hash_algo"); err != nil {
+			return fmt.Errorf("unable to disable user: %s[%d] prior to purge. UpdateUserCols: %w", u.Name, u.ID, err)
+		}
+
+		// Force any logged in sessions to log out
+		// FIXME: We also need to tell the session manager to log them out too.
+		eventsource.GetManager().SendMessage(u.ID, &eventsource.Event{
+			Name: "logout",
+		})
+
+		// Delete all repos belonging to this user
+		// Now this is not within a transaction because there are internal transactions within the DeleteRepository
+		// BUT: the db will still be consistent even if a number of repos have already been deleted.
+		// And in fact we want to capture any repositories that are being created in other transactions in the meantime
+		//
+		// An alternative option here would be write a DeleteAllRepositoriesForUserID function which would delete all of the repos
+		// but such a function would likely get out of date
+		err := repo_service.DeleteOwnerRepositoriesDirectly(ctx, u)
+		if err != nil {
+			return err
+		}
+
+		// Remove from Organizations and delete last owner organizations
+		// Now this is not within a transaction because there are internal transactions within the DeleteOrganization
+		// BUT: the db will still be consistent even if a number of organizations memberships and organizations have already been deleted
+		// And in fact we want to capture any organization additions that are being created in other transactions in the meantime
+		//
+		// An alternative option here would be write a function which would delete all organizations but it seems
+		// but such a function would likely get out of date
+		for {
+			orgs, err := db.Find[organization.Organization](ctx, organization.FindOrgOptions{
+				ListOptions: db.ListOptions{
+					PageSize: repo_model.RepositoryListDefaultPageSize,
+					Page:     1,
+				},
+				UserID:         u.ID,
+				IncludePrivate: true,
+			})
+			if err != nil {
+				return fmt.Errorf("unable to find org list for %s[%d]. Error: %w", u.Name, u.ID, err)
+			}
+			if len(orgs) == 0 {
+				break
+			}
+			for _, org := range orgs {
+				if err := models.RemoveOrgUser(ctx, org.ID, u.ID); err != nil {
+					if organization.IsErrLastOrgOwner(err) {
+						err = org_service.DeleteOrganization(ctx, org, true)
+						if err != nil {
+							return fmt.Errorf("unable to delete organization %d: %w", org.ID, err)
+						}
+					}
+					if err != nil {
+						return fmt.Errorf("unable to remove user %s[%d] from org %s[%d]. Error: %w", u.Name, u.ID, org.Name, org.ID, err)
+					}
+				}
+			}
+		}
+
+		// Delete Packages
+		if setting.Packages.Enabled {
+			if _, err := packages.RemoveAllPackages(ctx, u.ID); err != nil {
+				return err
+			}
+		}
+
+		// Delete Federated Users
+		if setting.Federation.Enabled {
+			if err := user_model.DeleteFederatedUser(ctx, u.ID); err != nil {
+				return err
+			}
+		}
+	}
+
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	// Note: A user owns any repository or belongs to any organization
+	//	cannot perform delete operation. This causes a race with the purge above
+	//  however consistency requires that we ensure that this is the case
+
+	// Check ownership of repository.
+	count, err := repo_model.CountRepositories(ctx, repo_model.CountRepositoryOptions{OwnerID: u.ID})
+	if err != nil {
+		return fmt.Errorf("GetRepositoryCount: %w", err)
+	} else if count > 0 {
+		return models.ErrUserOwnRepos{UID: u.ID}
+	}
+
+	// Check membership of organization.
+	count, err = organization.GetOrganizationCount(ctx, u)
+	if err != nil {
+		return fmt.Errorf("GetOrganizationCount: %w", err)
+	} else if count > 0 {
+		return models.ErrUserHasOrgs{UID: u.ID}
+	}
+
+	// Check ownership of packages.
+	if ownsPackages, err := packages_model.HasOwnerPackages(ctx, u.ID); err != nil {
+		return fmt.Errorf("HasOwnerPackages: %w", err)
+	} else if ownsPackages {
+		return models.ErrUserOwnPackages{UID: u.ID}
+	}
+
+	if err := deleteUser(ctx, u, purge); err != nil {
+		return fmt.Errorf("DeleteUser: %w", err)
+	}
+
+	if err := committer.Commit(); err != nil {
+		return err
+	}
+	committer.Close()
+
+	if hasSSHKey {
+		if err = asymkey_model.RewriteAllPublicKeys(ctx); err != nil {
+			return err
+		}
+	}
+
+	if hasPrincipialSSHKey {
+		if err = asymkey_model.RewriteAllPrincipalKeys(ctx); err != nil {
+			return err
+		}
+	}
+
+	// Note: There are something just cannot be roll back,
+	//	so just keep error logs of those operations.
+	path := user_model.UserPath(u.Name)
+	if err := util.RemoveAll(path); err != nil {
+		err = fmt.Errorf("Failed to RemoveAll %s: %w", path, err)
+		_ = system_model.CreateNotice(ctx, system_model.NoticeTask, fmt.Sprintf("delete user '%s': %v", u.Name, err))
+		return err
+	}
+
+	if u.Avatar != "" {
+		avatarPath := u.CustomAvatarRelativePath()
+		if err := storage.Avatars.Delete(avatarPath); err != nil {
+			err = fmt.Errorf("Failed to remove %s: %w", avatarPath, err)
+			_ = system_model.CreateNotice(ctx, system_model.NoticeTask, fmt.Sprintf("delete user '%s': %v", u.Name, err))
+			return err
+		}
+	}
+
+	return nil
+}
+
+// DeleteInactiveUsers deletes all inactive users and email addresses.
+func DeleteInactiveUsers(ctx context.Context, olderThan time.Duration) error {
+	users, err := user_model.GetInactiveUsers(ctx, olderThan)
+	if err != nil {
+		return err
+	}
+
+	// FIXME: should only update authorized_keys file once after all deletions.
+	for _, u := range users {
+		select {
+		case <-ctx.Done():
+			return db.ErrCancelledf("Before delete inactive user %s", u.Name)
+		default:
+		}
+		if err := DeleteUser(ctx, u, false); err != nil {
+			// Ignore users that were set inactive by admin.
+			if models.IsErrUserOwnRepos(err) || models.IsErrUserHasOrgs(err) ||
+				models.IsErrUserOwnPackages(err) || models.IsErrDeleteLastAdminUser(err) {
+				log.Warn("Inactive user %q has repositories, organizations or packages, skipping deletion: %v", u.Name, err)
+				continue
+			}
+			return err
+		}
+	}
+
+	return nil
+}
diff --git a/services/user/user_test.go b/services/user/user_test.go
new file mode 100644
index 0000000..ad5387c
--- /dev/null
+++ b/services/user/user_test.go
@@ -0,0 +1,264 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package user
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/models"
+	asymkey_model "code.gitea.io/gitea/models/asymkey"
+	"code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/organization"
+	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"
+	"code.gitea.io/gitea/modules/test"
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMain(m *testing.M) {
+	unittest.MainTest(m)
+}
+
+func TestDeleteUser(t *testing.T) {
+	test := func(userID int64) {
+		require.NoError(t, unittest.PrepareTestDatabase())
+		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: userID})
+
+		ownedRepos := make([]*repo_model.Repository, 0, 10)
+		require.NoError(t, db.GetEngine(db.DefaultContext).Find(&ownedRepos, &repo_model.Repository{OwnerID: userID}))
+		if len(ownedRepos) > 0 {
+			err := DeleteUser(db.DefaultContext, user, false)
+			require.Error(t, err)
+			assert.True(t, models.IsErrUserOwnRepos(err))
+			return
+		}
+
+		orgUsers := make([]*organization.OrgUser, 0, 10)
+		require.NoError(t, db.GetEngine(db.DefaultContext).Find(&orgUsers, &organization.OrgUser{UID: userID}))
+		for _, orgUser := range orgUsers {
+			if err := models.RemoveOrgUser(db.DefaultContext, orgUser.OrgID, orgUser.UID); err != nil {
+				assert.True(t, organization.IsErrLastOrgOwner(err))
+				return
+			}
+		}
+		require.NoError(t, DeleteUser(db.DefaultContext, user, false))
+		unittest.AssertNotExistsBean(t, &user_model.User{ID: userID})
+		unittest.CheckConsistencyFor(t, &user_model.User{}, &repo_model.Repository{})
+	}
+	test(2)
+	test(4)
+	test(8)
+	test(11)
+
+	org := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 3})
+	require.Error(t, DeleteUser(db.DefaultContext, org, false))
+}
+
+func TestPurgeUser(t *testing.T) {
+	defer unittest.OverrideFixtures(
+		unittest.FixturesOptions{
+			Dir:  filepath.Join(setting.AppWorkPath, "models/fixtures/"),
+			Base: setting.AppWorkPath,
+			Dirs: []string{"services/user/TestPurgeUser/"},
+		},
+	)()
+	require.NoError(t, unittest.PrepareTestDatabase())
+	defer test.MockVariableValue(&setting.SSH.RootPath, t.TempDir())()
+	defer test.MockVariableValue(&setting.SSH.CreateAuthorizedKeysFile, true)()
+	defer test.MockVariableValue(&setting.SSH.CreateAuthorizedPrincipalsFile, true)()
+	defer test.MockVariableValue(&setting.SSH.StartBuiltinServer, false)()
+	require.NoError(t, asymkey_model.RewriteAllPublicKeys(db.DefaultContext))
+	require.NoError(t, asymkey_model.RewriteAllPrincipalKeys(db.DefaultContext))
+
+	test := func(userID int64, modifySSHKey bool) {
+		require.NoError(t, unittest.PrepareTestDatabase())
+		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: userID})
+
+		fAuthorizedKeys, err := os.Open(filepath.Join(setting.SSH.RootPath, "authorized_keys"))
+		require.NoError(t, err)
+		authorizedKeysStatBefore, err := fAuthorizedKeys.Stat()
+		require.NoError(t, err)
+		fAuthorizedPrincipals, err := os.Open(filepath.Join(setting.SSH.RootPath, "authorized_principals"))
+		require.NoError(t, err)
+		authorizedPrincipalsBefore, err := fAuthorizedPrincipals.Stat()
+		require.NoError(t, err)
+
+		require.NoError(t, DeleteUser(db.DefaultContext, user, true))
+
+		unittest.AssertNotExistsBean(t, &user_model.User{ID: userID})
+		unittest.CheckConsistencyFor(t, &user_model.User{}, &repo_model.Repository{})
+
+		fAuthorizedKeys, err = os.Open(filepath.Join(setting.SSH.RootPath, "authorized_keys"))
+		require.NoError(t, err)
+		fAuthorizedPrincipals, err = os.Open(filepath.Join(setting.SSH.RootPath, "authorized_principals"))
+		require.NoError(t, err)
+
+		authorizedKeysStatAfter, err := fAuthorizedKeys.Stat()
+		require.NoError(t, err)
+		authorizedPrincipalsAfter, err := fAuthorizedPrincipals.Stat()
+		require.NoError(t, err)
+
+		if modifySSHKey {
+			assert.Greater(t, authorizedKeysStatAfter.ModTime(), authorizedKeysStatBefore.ModTime())
+			assert.Greater(t, authorizedPrincipalsAfter.ModTime(), authorizedPrincipalsBefore.ModTime())
+		} else {
+			assert.Equal(t, authorizedKeysStatAfter.ModTime(), authorizedKeysStatBefore.ModTime())
+			assert.Equal(t, authorizedPrincipalsAfter.ModTime(), authorizedPrincipalsBefore.ModTime())
+		}
+	}
+	test(2, true)
+	test(4, false)
+	test(8, false)
+	test(11, false)
+
+	org := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 3})
+	require.Error(t, DeleteUser(db.DefaultContext, org, false))
+}
+
+func TestCreateUser(t *testing.T) {
+	user := &user_model.User{
+		Name:               "GiteaBot",
+		Email:              "GiteaBot@gitea.io",
+		Passwd:             ";p['////..-++']",
+		IsAdmin:            false,
+		Theme:              setting.UI.DefaultTheme,
+		MustChangePassword: false,
+	}
+
+	require.NoError(t, user_model.CreateUser(db.DefaultContext, user))
+
+	require.NoError(t, DeleteUser(db.DefaultContext, user, false))
+}
+
+func TestRenameUser(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 21})
+
+	t.Run("Non-Local", func(t *testing.T) {
+		u := &user_model.User{
+			Type:      user_model.UserTypeIndividual,
+			LoginType: auth.OAuth2,
+		}
+		require.ErrorIs(t, RenameUser(db.DefaultContext, u, "user_rename"), user_model.ErrUserIsNotLocal{})
+	})
+
+	t.Run("Same username", func(t *testing.T) {
+		require.NoError(t, RenameUser(db.DefaultContext, user, user.Name))
+	})
+
+	t.Run("Non usable username", func(t *testing.T) {
+		usernames := []string{"--diff", "aa.png", ".well-known", "search", "aaa.atom"}
+		for _, username := range usernames {
+			t.Run(username, func(t *testing.T) {
+				require.Error(t, user_model.IsUsableUsername(username))
+				require.Error(t, RenameUser(db.DefaultContext, user, username))
+			})
+		}
+	})
+
+	t.Run("Only capitalization", func(t *testing.T) {
+		caps := strings.ToUpper(user.Name)
+		unittest.AssertNotExistsBean(t, &user_model.User{ID: user.ID, Name: caps})
+		unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{OwnerID: user.ID, OwnerName: user.Name})
+
+		require.NoError(t, RenameUser(db.DefaultContext, user, caps))
+
+		unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: user.ID, Name: caps})
+		unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{OwnerID: user.ID, OwnerName: caps})
+	})
+
+	t.Run("Already exists", func(t *testing.T) {
+		existUser := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+
+		require.ErrorIs(t, RenameUser(db.DefaultContext, user, existUser.Name), user_model.ErrUserAlreadyExist{Name: existUser.Name})
+		require.ErrorIs(t, RenameUser(db.DefaultContext, user, existUser.LowerName), user_model.ErrUserAlreadyExist{Name: existUser.LowerName})
+		newUsername := fmt.Sprintf("uSEr%d", existUser.ID)
+		require.ErrorIs(t, RenameUser(db.DefaultContext, user, newUsername), user_model.ErrUserAlreadyExist{Name: newUsername})
+	})
+
+	t.Run("Normal", func(t *testing.T) {
+		oldUsername := user.Name
+		newUsername := "User_Rename"
+
+		require.NoError(t, RenameUser(db.DefaultContext, user, newUsername))
+		unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: user.ID, Name: newUsername, LowerName: strings.ToLower(newUsername)})
+
+		redirectUID, err := user_model.LookupUserRedirect(db.DefaultContext, oldUsername)
+		require.NoError(t, err)
+		assert.EqualValues(t, user.ID, redirectUID)
+
+		unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{OwnerID: user.ID, OwnerName: user.Name})
+	})
+}
+
+func TestCreateUser_Issue5882(t *testing.T) {
+	// Init settings
+	_ = setting.Admin
+
+	passwd := ".//.;1;;//.,-=_"
+
+	tt := []struct {
+		user               *user_model.User
+		disableOrgCreation bool
+	}{
+		{&user_model.User{Name: "GiteaBot", Email: "GiteaBot@gitea.io", Passwd: passwd, MustChangePassword: false}, false},
+		{&user_model.User{Name: "GiteaBot2", Email: "GiteaBot2@gitea.io", Passwd: passwd, MustChangePassword: false}, true},
+	}
+
+	setting.Service.DefaultAllowCreateOrganization = true
+
+	for _, v := range tt {
+		setting.Admin.DisableRegularOrgCreation = v.disableOrgCreation
+
+		require.NoError(t, user_model.CreateUser(db.DefaultContext, v.user))
+
+		u, err := user_model.GetUserByEmail(db.DefaultContext, v.user.Email)
+		require.NoError(t, err)
+
+		assert.Equal(t, !u.AllowCreateOrganization, v.disableOrgCreation)
+
+		require.NoError(t, DeleteUser(db.DefaultContext, v.user, false))
+	}
+}
+
+func TestDeleteInactiveUsers(t *testing.T) {
+	require.NoError(t, unittest.PrepareTestDatabase())
+	// Add an inactive user older than a minute, with an associated email_address record.
+	oldUser := &user_model.User{Name: "OldInactive", LowerName: "oldinactive", Email: "old@example.com", CreatedUnix: timeutil.TimeStampNow().Add(-120)}
+	_, err := db.GetEngine(db.DefaultContext).NoAutoTime().Insert(oldUser)
+	require.NoError(t, err)
+	oldEmail := &user_model.EmailAddress{UID: oldUser.ID, IsPrimary: true, Email: "old@example.com", LowerEmail: "old@example.com"}
+	err = db.Insert(db.DefaultContext, oldEmail)
+	require.NoError(t, err)
+
+	// Add an inactive user that's not older than a minute, with an associated email_address record.
+	newUser := &user_model.User{Name: "NewInactive", LowerName: "newinactive", Email: "new@example.com"}
+	err = db.Insert(db.DefaultContext, newUser)
+	require.NoError(t, err)
+	newEmail := &user_model.EmailAddress{UID: newUser.ID, IsPrimary: true, Email: "new@example.com", LowerEmail: "new@example.com"}
+	err = db.Insert(db.DefaultContext, newEmail)
+	require.NoError(t, err)
+
+	err = DeleteInactiveUsers(db.DefaultContext, time.Minute)
+	require.NoError(t, err)
+
+	// User older than a minute should be deleted along with their email address.
+	unittest.AssertExistsIf(t, false, oldUser)
+	unittest.AssertExistsIf(t, false, oldEmail)
+
+	// User not older than a minute shouldn't be deleted and their emaill address should still exist.
+	unittest.AssertExistsIf(t, true, newUser)
+	unittest.AssertExistsIf(t, true, newEmail)
+}