Various fixes for issue mail notifications (#7165)

- Send individual mails for actions and comments
- Send mail for new issues/prs without a comment
- Use correct sender for reopen/close actions
- Hopefully fixed all bugs related to missing mails

Fixes: https://github.com/go-gitea/gitea/issues/7124
Fixes: https://github.com/go-gitea/gitea/issues/5977

3 files changed, 41 insertions, 19 deletions

diff --git a/models/issue_comment.go b/models/issue_comment.go
index 60fb5b0420..0d2e917f85 100644
--- a/models/issue_comment.go
+++ b/models/issue_comment.go
@@ -403,16 +403,23 @@ func (c *Comment) mailParticipants(e Engine, opType ActionType, issue *Issue) (e
 		return fmt.Errorf("UpdateIssueMentions [%d]: %v", c.IssueID, err)
 	}
 
-	content := c.Content
+	if len(c.Content) > 0 {
+		if err = mailIssueCommentToParticipants(e, issue, c.Poster, c.Content, c, mentions); err != nil {
+			log.Error("mailIssueCommentToParticipants: %v", err)
+		}
+	}
 
 	switch opType {
 	case ActionCloseIssue:
-		content = fmt.Sprintf("Closed #%d", issue.Index)
+		ct := fmt.Sprintf("Closed #%d.", issue.Index)
+		if err = mailIssueCommentToParticipants(e, issue, c.Poster, ct, c, mentions); err != nil {
+			log.Error("mailIssueCommentToParticipants: %v", err)
+		}
 	case ActionReopenIssue:
-		content = fmt.Sprintf("Reopened #%d", issue.Index)
-	}
-	if err = mailIssueCommentToParticipants(e, issue, c.Poster, content, c, mentions); err != nil {
-		log.Error("mailIssueCommentToParticipants: %v", err)
+		ct := fmt.Sprintf("Reopened #%d.", issue.Index)
+		if err = mailIssueCommentToParticipants(e, issue, c.Poster, ct, c, mentions); err != nil {
+			log.Error("mailIssueCommentToParticipants: %v", err)
+		}
 	}
 
 	return nil
diff --git a/models/issue_mail.go b/models/issue_mail.go
index 16f85ba378..01a12b16d2 100644
--- a/models/issue_mail.go
+++ b/models/issue_mail.go
@@ -118,26 +118,41 @@ func mailIssueCommentToParticipants(e Engine, issue *Issue, doer *User, content
 
 // MailParticipants sends new issue thread created emails to repository watchers
 // and mentioned people.
-func (issue *Issue) MailParticipants(opType ActionType) (err error) {
-	return issue.mailParticipants(x, opType)
+func (issue *Issue) MailParticipants(doer *User, opType ActionType) (err error) {
+	return issue.mailParticipants(x, doer, opType)
 }
 
-func (issue *Issue) mailParticipants(e Engine, opType ActionType) (err error) {
+func (issue *Issue) mailParticipants(e Engine, doer *User, opType ActionType) (err error) {
 	mentions := markup.FindAllMentions(issue.Content)
+
 	if err = UpdateIssueMentions(e, issue.ID, mentions); err != nil {
 		return fmt.Errorf("UpdateIssueMentions [%d]: %v", issue.ID, err)
 	}
 
-	var content = issue.Content
+	if len(issue.Content) > 0 {
+		if err = mailIssueCommentToParticipants(e, issue, doer, issue.Content, nil, mentions); err != nil {
+			log.Error("mailIssueCommentToParticipants: %v", err)
+		}
+	}
+
 	switch opType {
+	case ActionCreateIssue, ActionCreatePullRequest:
+		if len(issue.Content) == 0 {
+			ct := fmt.Sprintf("Created #%d.", issue.Index)
+			if err = mailIssueCommentToParticipants(e, issue, doer, ct, nil, mentions); err != nil {
+				log.Error("mailIssueCommentToParticipants: %v", err)
+			}
+		}
 	case ActionCloseIssue, ActionClosePullRequest:
-		content = fmt.Sprintf("Closed #%d", issue.Index)
+		ct := fmt.Sprintf("Closed #%d.", issue.Index)
+		if err = mailIssueCommentToParticipants(e, issue, doer, ct, nil, mentions); err != nil {
+			log.Error("mailIssueCommentToParticipants: %v", err)
+		}
 	case ActionReopenIssue, ActionReopenPullRequest:
-		content = fmt.Sprintf("Reopened #%d", issue.Index)
-	}
-
-	if err = mailIssueCommentToParticipants(e, issue, issue.Poster, content, nil, mentions); err != nil {
-		log.Error("mailIssueCommentToParticipants: %v", err)
+		ct := fmt.Sprintf("Reopened #%d.", issue.Index)
+		if err = mailIssueCommentToParticipants(e, issue, doer, ct, nil, mentions); err != nil {
+			log.Error("mailIssueCommentToParticipants: %v", err)
+		}
 	}
 
 	return nil
diff --git a/modules/notification/mail/mail.go b/modules/notification/mail/mail.go
index 9689f4d4ab..9d0db4f415 100644
--- a/modules/notification/mail/mail.go
+++ b/modules/notification/mail/mail.go
@@ -42,7 +42,7 @@ func (m *mailNotifier) NotifyCreateIssueComment(doer *models.User, repo *models.
 }
 
 func (m *mailNotifier) NotifyNewIssue(issue *models.Issue) {
-	if err := issue.MailParticipants(models.ActionCreateIssue); err != nil {
+	if err := issue.MailParticipants(issue.Poster, models.ActionCreateIssue); err != nil {
 		log.Error("MailParticipants: %v", err)
 	}
 }
@@ -63,13 +63,13 @@ func (m *mailNotifier) NotifyIssueChangeStatus(doer *models.User, issue *models.
 		}
 	}
 
-	if err := issue.MailParticipants(actionType); err != nil {
+	if err := issue.MailParticipants(doer, actionType); err != nil {
 		log.Error("MailParticipants: %v", err)
 	}
 }
 
 func (m *mailNotifier) NotifyNewPullRequest(pr *models.PullRequest) {
-	if err := pr.Issue.MailParticipants(models.ActionCreatePullRequest); err != nil {
+	if err := pr.Issue.MailParticipants(pr.Issue.Poster, models.ActionCreatePullRequest); err != nil {
 		log.Error("MailParticipants: %v", err)
 	}
 }