[MODERATION] Purge issues on user deletion

- Forgejo has the option to delete users, in which all data except
issues and comments are removed, this makes sense in some cases where
users need to be removed cleanly but without removing their existing bug
reports or comments to an discussion. In the case of spammers, admins
have the option to enable purging, where comments are removed.
- Add issues to the list of things to be removed if purge is checked.
- No unit testing, as this gigantic function doesn't have one to begin
with.
- Add integration test.
- Resolves https://codeberg.org/forgejo/forgejo/issues/1268

(cherry picked from commit 3ed381c758)
(cherry picked from commit 44d00650ce)
(cherry picked from commit 7f4da82779)
(cherry picked from commit d629314def)

Conflicts:
	models/fixtures/issue.yml
	https://codeberg.org/forgejo/forgejo/pulls/1508
(cherry picked from commit 794dcc218f)
(cherry picked from commit c433f2ecb6)
(cherry picked from commit bb23683f4b)
(cherry picked from commit 634c5604d4)
(cherry picked from commit 219073f5c5)
(cherry picked from commit 32893dbab1)
(cherry picked from commit 0ef40cfb5a)
(cherry picked from commit e535409cab3c276fd8db6b402f85934ef5127491)
(cherry picked from commit 29059f611b)
(cherry picked from commit cd480c5b8b)
(cherry picked from commit 340e657392)
(cherry picked from commit 3a7a5564d0)
(cherry picked from commit 1dbcaca726)
(cherry picked from commit c491c439e2)
(cherry picked from commit c8fe2140cc)
(cherry picked from commit c72564e3ee)

models/fixtures/issue.yml

@@ -338,3 +338,20 @@
   created_unix: 978307210
   updated_unix: 978307210
   is_locked: false
+
+-
+  id: 21
+  repo_id: 10
+  index: 2
+  poster_id: 8
+  original_author_id: 0
+  name: issue for pr
+  content: content
+  milestone_id: 0
+  priority: 0
+  is_closed: false
+  is_pull: false
+  num_comments: 0
+  created_unix: 946684830
+  updated_unix: 978307200
+  is_locked: false

models/fixtures/issue_index.yml

@@ -9,7 +9,7 @@
   max_index: 2
 -
   group_id: 10
-  max_index: 1
+  max_index: 2
 -
   group_id: 32
   max_index: 2

models/fixtures/repository.yml

@@ -283,7 +283,7 @@
   num_watches: 0
   num_stars: 0
   num_forks: 1
-  num_issues: 0
+  num_issues: 1
   num_closed_issues: 0
   num_pulls: 1
   num_closed_pulls: 0

options/locale/locale_en-US.ini

@@ -2843,7 +2843,7 @@ users.cannot_delete_self = "You cannot delete yourself"
 users.still_own_repo = This user still owns one or more repositories. Delete or transfer these repositories first.
 users.still_has_org = This user is a member of an organization. Remove the user from any organizations first.
 users.purge = Purge User
-users.purge_help = Forcibly delete user and any repositories, organizations, and packages owned by the user. All comments will be deleted too.
+users.purge_help = Forcibly delete user and any repositories, organizations, and packages owned by the user. All comments and issues posted by this user will also be deleted.
 users.still_own_packages = This user still owns one or more packages, delete these packages first.
 users.deletion_success = The user account has been deleted.
 users.reset_2fa = Reset 2FA

services/user/delete.go

@@ -23,6 +23,7 @@ import (
 	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"
 )
@@ -127,6 +128,31 @@ func deleteUser(ctx context.Context, u *user_model.User, purge bool) (err error)
 		}
 	}
 
+	// ***** 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

tests/integration/admin_user_test.go

@@ -75,9 +75,10 @@ func TestAdminDeleteUser(t *testing.T) {
 	csrf := GetCSRF(t, session, "/admin/users/8/edit")
 	req := NewRequestWithValues(t, "POST", "/admin/users/8/delete", map[string]string{
 		"_csrf": csrf,
+		"purge": "true",
 	})
 	session.MakeRequest(t, req, http.StatusSeeOther)
 
-	assertUserDeleted(t, 8)
+	assertUserDeleted(t, 8, true)
 	unittest.CheckConsistencyFor(t, &user_model.User{})
 }

tests/integration/api_issue_test.go

@@ -368,7 +368,7 @@ func TestAPISearchIssues(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 
 	// as this API was used in the frontend, it uses UI page size
-	expectedIssueCount := 18 // from the fixtures
+	expectedIssueCount := 19 // from the fixtures
 	if expectedIssueCount > setting.UI.IssuePagingNum {
 		expectedIssueCount = setting.UI.IssuePagingNum
 	}
@@ -392,7 +392,7 @@ func TestAPISearchIssues(t *testing.T) {
 	req = NewRequest(t, "GET", link.String()).AddTokenAuth(token)
 	resp = MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.Len(t, apiIssues, 11)
+	assert.Len(t, apiIssues, 12)
 	query.Del("since")
 	query.Del("before")
 
@@ -408,15 +408,15 @@ func TestAPISearchIssues(t *testing.T) {
 	req = NewRequest(t, "GET", link.String()).AddTokenAuth(token)
 	resp = MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.EqualValues(t, "20", resp.Header().Get("X-Total-Count"))
-	assert.Len(t, apiIssues, 20)
+	assert.EqualValues(t, "21", resp.Header().Get("X-Total-Count"))
+	assert.Len(t, apiIssues, 21)
 
 	query.Add("limit", "10")
 	link.RawQuery = query.Encode()
 	req = NewRequest(t, "GET", link.String()).AddTokenAuth(token)
 	resp = MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.EqualValues(t, "20", resp.Header().Get("X-Total-Count"))
+	assert.EqualValues(t, "21", resp.Header().Get("X-Total-Count"))
 	assert.Len(t, apiIssues, 10)
 
 	query = url.Values{"assigned": {"true"}, "state": {"all"}}
@@ -466,7 +466,7 @@ func TestAPISearchIssuesWithLabels(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 
 	// as this API was used in the frontend, it uses UI page size
-	expectedIssueCount := 18 // from the fixtures
+	expectedIssueCount := 19 // from the fixtures
 	if expectedIssueCount > setting.UI.IssuePagingNum {
 		expectedIssueCount = setting.UI.IssuePagingNum
 	}

tests/integration/delete_user_test.go

@@ -17,7 +17,7 @@ import (
 	"code.gitea.io/gitea/tests"
 )
 
-func assertUserDeleted(t *testing.T, userID int64) {
+func assertUserDeleted(t *testing.T, userID int64, purged bool) {
 	unittest.AssertNotExistsBean(t, &user_model.User{ID: userID})
 	unittest.AssertNotExistsBean(t, &user_model.Follow{UserID: userID})
 	unittest.AssertNotExistsBean(t, &user_model.Follow{FollowID: userID})
@@ -27,6 +27,9 @@ func assertUserDeleted(t *testing.T, userID int64) {
 	unittest.AssertNotExistsBean(t, &issues_model.IssueUser{UID: userID})
 	unittest.AssertNotExistsBean(t, &organization.TeamUser{UID: userID})
 	unittest.AssertNotExistsBean(t, &repo_model.Star{UID: userID})
+	if purged {
+		unittest.AssertNotExistsBean(t, &issues_model.Issue{PosterID: userID})
+	}
 }
 
 func TestUserDeleteAccount(t *testing.T) {
@@ -40,7 +43,7 @@ func TestUserDeleteAccount(t *testing.T) {
 	})
 	session.MakeRequest(t, req, http.StatusSeeOther)
 
-	assertUserDeleted(t, 8)
+	assertUserDeleted(t, 8, false)
 	unittest.CheckConsistencyFor(t, &user_model.User{})
 }