[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 3ed381c75826ffc6834fd54943f71579c060c16d)
(cherry picked from commit 44d00650ce77bd4395892a62a64a90829578c81d)
(cherry picked from commit 7f4da82779fa1d761b5fe045d3e0b4b2627638c0)
(cherry picked from commit d629314def8e3e6d0f78184aa584fa57ece18bb1)

Conflicts:
	models/fixtures/issue.yml
	https://codeberg.org/forgejo/forgejo/pulls/1508
(cherry picked from commit 794dcc218f2c0c53028aaf617407d46bddda57f3)
(cherry picked from commit c433f2ecb60669e5c8748912b30c0433d5fe507a)
(cherry picked from commit bb23683f4b10a504da677843bc2ae2b73ec299c4)
(cherry picked from commit 634c5604d430b1b531467783bc70bb4efbee023d)
(cherry picked from commit 219073f5c5558e7712039a83754f68b092689963)
(cherry picked from commit 32893dbab139e2d238db8c3d7878321c6bdd0cd3)
(cherry picked from commit 0ef40cfb5a23d9f654e093ade2668d82ce8d333a)
(cherry picked from commit e535409cab3c276fd8db6b402f85934ef5127491)
(cherry picked from commit 29059f611b5617d275737996b9e4076a3b0b667e)
(cherry picked from commit cd480c5b8b99feed11a3797ab36a697cd0dcc91b)
(cherry picked from commit 340e6573924dbd8d69843c69243e6b027c66f166)
(cherry picked from commit 3a7a5564d02bde767cb14cbc30e3ca816808f7d6)
(cherry picked from commit 1dbcaca726f3cbd777a4965b7414d6b60050ba54)
(cherry picked from commit c491c439e28f04fdd0f002ec1403b19933afc7c3)
(cherry picked from commit c8fe2140cc15dcffa9bb7c966493707ac23cdb74)
(cherry picked from commit c72564e3ee1bd9972d4f7d7a7e1dc34bb8d81299)
(cherry picked from commit 2084f3fa113bca751be0689f53dfeb7d059ffb8f)
(cherry picked from commit 918e65327da011303ba7dfb3ff6970b8c83f5319)

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

@@ -2875,7 +2875,7 @@ 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{})
 }