Add issue delete notifier (#34592)

Fixes https://github.com/go-gitea/gitea/issues/34591

A reference regarding the deletion of issue webhooks on GitHub:
https://docs.github.com/en/webhooks/webhook-events-and-payloads?actionType=deleted#issues

modules/structs/hook.go

@@ -286,6 +286,8 @@ const (
 	HookIssueReOpened HookIssueAction = "reopened"
 	// HookIssueEdited edited
 	HookIssueEdited HookIssueAction = "edited"
+	// HookIssueDeleted is an issue action for deleting an issue
+	HookIssueDeleted HookIssueAction = "deleted"
 	// HookIssueAssigned assigned
 	HookIssueAssigned HookIssueAction = "assigned"
 	// HookIssueUnassigned unassigned

options/locale/locale_en-US.ini

@@ -2384,7 +2384,7 @@ settings.event_repository = Repository
 settings.event_repository_desc = Repository created or deleted.
 settings.event_header_issue = Issue Events
 settings.event_issues = Issues
-settings.event_issues_desc = Issue opened, closed, reopened, or edited.
+settings.event_issues_desc = Issue opened, closed, reopened, edited or deleted.
 settings.event_issue_assign = Issue Assigned
 settings.event_issue_assign_desc = Issue assigned or unassigned.
 settings.event_issue_label = Issue Labeled
@@ -2395,7 +2395,7 @@ settings.event_issue_comment = Issue Comment
 settings.event_issue_comment_desc = Issue comment created, edited, or deleted.
 settings.event_header_pull_request = Pull Request Events
 settings.event_pull_request = Pull Request
-settings.event_pull_request_desc = Pull request opened, closed, reopened, or edited.
+settings.event_pull_request_desc = Pull request opened, closed, reopened, edited or deleted.
 settings.event_pull_request_assign = Pull Request Assigned
 settings.event_pull_request_assign_desc = Pull request assigned or unassigned.
 settings.event_pull_request_label = Pull Request Labeled

services/webhook/notifier.go

@@ -294,6 +294,43 @@ func (m *webhookNotifier) NewIssue(ctx context.Context, issue *issues_model.Issu
 	}
 }
 
+func (m *webhookNotifier) DeleteIssue(ctx context.Context, doer *user_model.User, issue *issues_model.Issue) {
+	permission, _ := access_model.GetUserRepoPermission(ctx, issue.Repo, doer)
+	if issue.IsPull {
+		if err := issue.LoadPullRequest(ctx); err != nil {
+			log.Error("LoadPullRequest: %v", err)
+			return
+		}
+		if err := PrepareWebhooks(ctx, EventSource{Repository: issue.Repo}, webhook_module.HookEventPullRequest, &api.PullRequestPayload{
+			Action:      api.HookIssueDeleted,
+			Index:       issue.Index,
+			PullRequest: convert.ToAPIPullRequest(ctx, issue.PullRequest, doer),
+			Repository:  convert.ToRepo(ctx, issue.Repo, permission),
+			Sender:      convert.ToUser(ctx, doer, nil),
+		}); err != nil {
+			log.Error("PrepareWebhooks: %v", err)
+		}
+	} else {
+		if err := issue.LoadRepo(ctx); err != nil {
+			log.Error("issue.LoadRepo: %v", err)
+			return
+		}
+		if err := issue.LoadPoster(ctx); err != nil {
+			log.Error("issue.LoadPoster: %v", err)
+			return
+		}
+		if err := PrepareWebhooks(ctx, EventSource{Repository: issue.Repo}, webhook_module.HookEventIssues, &api.IssuePayload{
+			Action:     api.HookIssueDeleted,
+			Index:      issue.Index,
+			Issue:      convert.ToAPIIssue(ctx, issue.Poster, issue),
+			Repository: convert.ToRepo(ctx, issue.Repo, permission),
+			Sender:     convert.ToUser(ctx, doer, nil),
+		}); err != nil {
+			log.Error("PrepareWebhooks: %v", err)
+		}
+	}
+}
+
 func (m *webhookNotifier) NewPullRequest(ctx context.Context, pull *issues_model.PullRequest, mentions []*user_model.User) {
 	if err := pull.LoadIssue(ctx); err != nil {
 		log.Error("pull.LoadIssue: %v", err)

tests/integration/issue_test.go

@@ -148,6 +148,13 @@ func testNewIssue(t *testing.T, session *TestSession, user, repo, title, content
 	return issueURL
 }
 
+func testIssueDelete(t *testing.T, session *TestSession, issueURL string) {
+	req := NewRequestWithValues(t, "POST", path.Join(issueURL, "delete"), map[string]string{
+		"_csrf": GetUserCSRFToken(t, session),
+	})
+	session.MakeRequest(t, req, http.StatusSeeOther)
+}
+
 func testIssueAssign(t *testing.T, session *TestSession, repoLink string, issueID, assigneeID int64) {
 	req := NewRequestWithValues(t, "POST", fmt.Sprintf(repoLink+"/issues/assignee?issue_ids=%d", issueID), map[string]string{
 		"_csrf":  GetUserCSRFToken(t, session),

tests/integration/repo_webhook_test.go

@@ -9,6 +9,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"net/url"
+	"path"
 	"strings"
 	"testing"
 
@@ -450,6 +451,39 @@ func Test_WebhookIssue(t *testing.T) {
 	})
 }
 
+func Test_WebhookIssueDelete(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, giteaURL *url.URL) {
+		var payloads []api.IssuePayload
+		var triggeredEvent string
+		provider := newMockWebhookProvider(func(r *http.Request) {
+			content, _ := io.ReadAll(r.Body)
+			var payload api.IssuePayload
+			err := json.Unmarshal(content, &payload)
+			assert.NoError(t, err)
+			payloads = append(payloads, payload)
+			triggeredEvent = "issue"
+		}, http.StatusOK)
+		defer provider.Close()
+
+		// 1. create a new webhook with special webhook for repo1
+		session := loginUser(t, "user2")
+		testAPICreateWebhookForRepo(t, session, "user2", "repo1", provider.URL(), "issues")
+		issueURL := testNewIssue(t, session, "user2", "repo1", "Title1", "Description1")
+
+		// 2. trigger the webhook
+		testIssueDelete(t, session, issueURL)
+
+		// 3. validate the webhook is triggered
+		assert.Equal(t, "issue", triggeredEvent)
+		require.Len(t, payloads, 2)
+		assert.EqualValues(t, "deleted", payloads[1].Action)
+		assert.Equal(t, "repo1", payloads[1].Issue.Repo.Name)
+		assert.Equal(t, "user2/repo1", payloads[1].Issue.Repo.FullName)
+		assert.Equal(t, "Title1", payloads[1].Issue.Title)
+		assert.Equal(t, "Description1", payloads[1].Issue.Body)
+	})
+}
+
 func Test_WebhookIssueAssign(t *testing.T) {
 	onGiteaRun(t, func(t *testing.T, giteaURL *url.URL) {
 		var payloads []api.PullRequestPayload
@@ -596,6 +630,44 @@ func Test_WebhookPullRequest(t *testing.T) {
 	})
 }
 
+func Test_WebhookPullRequestDelete(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, giteaURL *url.URL) {
+		var payloads []api.PullRequestPayload
+		var triggeredEvent string
+		provider := newMockWebhookProvider(func(r *http.Request) {
+			content, _ := io.ReadAll(r.Body)
+			var payload api.PullRequestPayload
+			err := json.Unmarshal(content, &payload)
+			assert.NoError(t, err)
+			payloads = append(payloads, payload)
+			triggeredEvent = "pull_request"
+		}, http.StatusOK)
+		defer provider.Close()
+
+		// 1. create a new webhook with special webhook for repo1
+		session := loginUser(t, "user2")
+		testAPICreateWebhookForRepo(t, session, "user2", "repo1", provider.URL(), "pull_request")
+
+		testAPICreateBranch(t, session, "user2", "repo1", "master", "master2", http.StatusCreated)
+
+		repo1 := unittest.AssertExistsAndLoadBean(t, &repo.Repository{ID: 1})
+		issueURL := testCreatePullToDefaultBranch(t, session, repo1, repo1, "master2", "first pull request")
+
+		// 2. trigger the webhook
+		testIssueDelete(t, session, path.Join(repo1.Link(), "pulls", issueURL))
+
+		// 3. validate the webhook is triggered
+		assert.Equal(t, "pull_request", triggeredEvent)
+		require.Len(t, payloads, 2)
+		assert.EqualValues(t, "deleted", payloads[1].Action)
+		assert.Equal(t, "repo1", payloads[1].PullRequest.Base.Repository.Name)
+		assert.Equal(t, "user2/repo1", payloads[1].PullRequest.Base.Repository.FullName)
+		assert.Equal(t, 0, *payloads[1].PullRequest.Additions)
+		assert.Equal(t, 0, *payloads[1].PullRequest.ChangedFiles)
+		assert.Equal(t, 0, *payloads[1].PullRequest.Deletions)
+	})
+}
+
 func Test_WebhookPullRequestComment(t *testing.T) {
 	onGiteaRun(t, func(t *testing.T, giteaURL *url.URL) {
 		var payloads []api.IssueCommentPayload