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MM-68829 Improving UX for DMs sent on PR comments #1010

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c49b18c
Improving UX for DMs sent on PR comments
avasconcelos114 May 15, 2026
42b3f35
Fixing issues found in review
avasconcelos114 May 15, 2026
ea29a91
Removed useless empty string return
avasconcelos114 May 26, 2026
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61 changes: 54 additions & 7 deletions server/plugin/template.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,16 @@ func init() {
return mdCommentRegex.ReplaceAllString(body, "")
}

funcMap["cleanBody"] = func(body string) string {
cleaned := body
if strings.Contains(cleaned, "notifications@github.com") {
cleaned = strings.Split(cleaned, "\n\nOn")[0]
}
cleaned = mdCommentRegex.ReplaceAllString(cleaned, "")
cleaned = strings.TrimSpace(cleaned)
return cleaned
}

// Replace any GitHub username with its corresponding Mattermost username, if any
funcMap["replaceAllGitHubUsernames"] = func(body string) string {
return gitHubUsernameRegex.ReplaceAllStringFunc(body, func(matched string) string {
Expand Down Expand Up @@ -358,41 +368,78 @@ Reviewers: {{range $i, $el := .RequestedReviewers -}} {{- if $i}}, {{end}}{{temp
{{template "repo" .GetRepo}} New review comment by {{template "user" .GetSender}} on {{template "pullRequest" .GetPullRequest}}:

{{.GetComment.GetBody | trimBody | replaceAllGitHubUsernames}}
`))

template.Must(masterTemplate.New("reviewCommentMentionNotification").Funcs(funcMap).Parse(`
{{template "user" .GetSender}} mentioned you in a review comment on [{{.GetRepo.GetFullName}}#{{.GetPullRequest.GetNumber}}]({{.GetComment.GetHTMLURL}}) - {{.GetPullRequest.GetTitle}}:
{{- $body := .GetComment.GetBody | cleanBody | replaceAllGitHubUsernames}}
{{- if $body}}
{{$body | quote}}
{{- end}}
`))

template.Must(masterTemplate.New("reviewCommentAuthorNotification").Funcs(funcMap).Parse(`
{{template "user" .GetSender}} commented on your pull request [{{.GetRepo.GetFullName}}#{{.GetPullRequest.GetNumber}}]({{.GetComment.GetHTMLURL}}) - {{.GetPullRequest.GetTitle}}:
{{- $body := .GetComment.GetBody | cleanBody | replaceAllGitHubUsernames}}
{{- if $body}}
{{$body | quote}}
{{- end}}
`))

template.Must(masterTemplate.New("commentMentionNotification").Funcs(funcMap).Parse(`
{{template "user" .GetSender}} mentioned you on [{{.GetRepo.GetFullName}}#{{.Issue.GetNumber}}]({{.GetComment.GetHTMLURL}}) - {{.Issue.GetTitle}}:
{{.GetComment.GetBody | trimBody | quote | replaceAllGitHubUsernames}}
{{- $body := .GetComment.GetBody | cleanBody | replaceAllGitHubUsernames}}
{{- if $body}}
{{$body | quote}}
{{- end}}
`))

template.Must(masterTemplate.New("commentAuthorPullRequestNotification").Funcs(funcMap).Parse(`
{{template "user" .GetSender}} commented on your pull request {{template "eventRepoIssueFullLinkWithTitle" .}}:
{{.GetComment.GetBody | trimBody | quote | replaceAllGitHubUsernames}}
{{- $body := .GetComment.GetBody | cleanBody | replaceAllGitHubUsernames}}
{{- if $body}}
{{$body | quote}}
{{- end}}
`))

template.Must(masterTemplate.New("commentAssigneePullRequestNotification").Funcs(funcMap).Parse(`
{{template "user" .GetSender}} commented on pull request you are assigned to {{template "eventRepoIssueFullLinkWithTitle" .}}:
{{.GetComment.GetBody | trimBody | quote | replaceAllGitHubUsernames}}
{{- $body := .GetComment.GetBody | cleanBody | replaceAllGitHubUsernames}}
{{- if $body}}
{{$body | quote}}
{{- end}}
`))

template.Must(masterTemplate.New("commentAssigneeIssueNotification").Funcs(funcMap).Parse(`
{{template "user" .GetSender}} commented on an issue you are assigned to {{template "eventRepoIssueFullLinkWithTitle" .}}:
{{.GetComment.GetBody | trimBody | quote | replaceAllGitHubUsernames}}
{{- $body := .GetComment.GetBody | cleanBody | replaceAllGitHubUsernames}}
{{- if $body}}
{{$body | quote}}
{{- end}}
`))

template.Must(masterTemplate.New("commentAssigneeSelfMentionPullRequestNotification").Funcs(funcMap).Parse(`
{{template "user" .GetSender}} mentioned you on a pull request that you are assigned to {{template "eventRepoIssueFullLinkWithTitle" .}}:
{{.GetComment.GetBody | trimBody | quote | replaceAllGitHubUsernames}}
{{- $body := .GetComment.GetBody | cleanBody | replaceAllGitHubUsernames}}
{{- if $body}}
{{$body | quote}}
{{- end}}
`))

template.Must(masterTemplate.New("commentAssigneeSelfMentionIssueNotification").Funcs(funcMap).Parse(`
{{template "user" .GetSender}} mentioned you on an issue that you are assigned to {{template "eventRepoIssueFullLinkWithTitle" .}}:
{{.GetComment.GetBody | trimBody | quote | replaceAllGitHubUsernames}}
{{- $body := .GetComment.GetBody | cleanBody | replaceAllGitHubUsernames}}
{{- if $body}}
{{$body | quote}}
{{- end}}
`))

template.Must(masterTemplate.New("commentAuthorIssueNotification").Funcs(funcMap).Parse(`
{{template "user" .GetSender}} commented on your issue {{template "eventRepoIssueFullLinkWithTitle" .}}:
{{.GetComment.GetBody | trimBody | quote | replaceAllGitHubUsernames}}
{{- $body := .GetComment.GetBody | cleanBody | replaceAllGitHubUsernames}}
{{- if $body}}
{{$body | quote}}
{{- end}}
`))

template.Must(masterTemplate.New("pullRequestNotification").Funcs(funcMap).Parse(`
Expand Down
11 changes: 7 additions & 4 deletions server/plugin/test_utils.go
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -280,8 +280,9 @@ func GetMockPullRequestReviewEvent(action, state, repo string, isPrivate bool, r
}
}

func GetMockPullRequestReviewCommentEvent() *github.PullRequestReviewCommentEvent {
func GetMockPullRequestReviewCommentEvent(action, body, sender string) *github.PullRequestReviewCommentEvent {
return &github.PullRequestReviewCommentEvent{
Action: github.String(action),
Repo: &github.Repository{
Name: github.String(MockRepoName),
FullName: github.String(MockOrgRepo),
Expand All @@ -290,13 +291,15 @@ func GetMockPullRequestReviewCommentEvent() *github.PullRequestReviewCommentEven
},
Comment: &github.PullRequestComment{
ID: github.Int64(12345),
Body: github.String("This is a review comment"),
Body: github.String(body),
HTMLURL: github.String(fmt.Sprintf("%s%s/pull/1#discussion_r12345", GithubBaseURL, MockOrgRepo)),
},
Sender: &github.User{
Login: github.String(MockUserLogin),
Login: github.String(sender),
},
PullRequest: &github.PullRequest{
User: &github.User{Login: github.String(MockIssueAuthor)},
},
PullRequest: &github.PullRequest{},
}
}

Expand Down
106 changes: 104 additions & 2 deletions server/plugin/webhook.go
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -287,6 +287,8 @@ func (p *Plugin) handleWebhook(w http.ResponseWriter, r *http.Request) {
repo = event.GetRepo()
handler = func() {
p.postPullRequestReviewCommentEvent(event)
p.handleReviewCommentMentionNotification(event)
p.handleReviewCommentAuthorNotification(event)
}
case *github.PushEvent:
repo = ConvertPushEventRepositoryToRepository(event.GetRepo())
Expand Down Expand Up @@ -1019,12 +1021,16 @@ func (p *Plugin) postPullRequestReviewEvent(event *github.PullRequestReviewEvent
func (p *Plugin) postPullRequestReviewCommentEvent(event *github.PullRequestReviewCommentEvent) {
repo := event.GetRepo()

if event.GetAction() != actionCreated {
return
}

subs := p.GetSubscribedChannelsForRepository(repo)
if len(subs) == 0 {
return
}

newReviewMessage, err := renderTemplate("newReviewComment", event)
message, err := renderTemplate("newReviewComment", event)
if err != nil {
p.client.Log.Warn("Failed to render template", "error", err.Error())
return
Expand Down Expand Up @@ -1061,7 +1067,7 @@ func (p *Plugin) postPullRequestReviewCommentEvent(event *github.PullRequestRevi
continue
}

post := p.makeBotPost(newReviewMessage, "custom_git_pr_comment")
post := p.makeBotPost(message, "custom_git_pr_comment")

repoName := strings.ToLower(repo.GetFullName())
commentID := event.GetComment().GetID()
Expand All @@ -1077,6 +1083,97 @@ func (p *Plugin) postPullRequestReviewCommentEvent(event *github.PullRequestRevi
}
}

func (p *Plugin) handleReviewCommentMentionNotification(event *github.PullRequestReviewCommentEvent) {
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@nang2049 nang2049 May 19, 2026

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handleCommentMentionNotification filters out mentioned users who are also assignees. Maybe worth mirroring the skip logic for consistency and to avoid double DM?

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@avasconcelos114 avasconcelos114 May 26, 2026

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For the PullRequestReviewCommentEvent events there isn't an assignee handler like we do for IssueCommentEvent, only one handler for the author which this function is skipping inhandleReviewCommentMentionNotification:1112 to avoid duplication, so I think in here we're safe from the risk of double DMing here

if event.GetAction() != actionCreated {
return
}

body := event.GetComment().GetBody()

if strings.Contains(body, "notifications@github.com") {
body = strings.Split(body, "\n\nOn")[0]
}

body = mdCommentRegex.ReplaceAllString(body, "")

mentionedUsernames := parseGitHubUsernamesFromText(body)
Comment thread
coderabbitai[bot] marked this conversation as resolved.

message, err := renderTemplate("reviewCommentMentionNotification", event)
if err != nil {
p.client.Log.Warn("Failed to render template", "error", err.Error())
return
}

for _, username := range mentionedUsernames {
if strings.EqualFold(username, event.GetSender().GetLogin()) {
continue
}

if strings.EqualFold(username, event.GetPullRequest().GetUser().GetLogin()) {
continue
}

userID := p.getGitHubToUserIDMapping(username)
if userID == "" {
continue
}

if event.GetRepo().GetPrivate() && !p.permissionToRepo(userID, event.GetRepo().GetFullName()) {
continue
}

if p.senderMutedByReceiver(userID, event.GetSender().GetLogin()) {
continue
}

channel, err := p.client.Channel.GetDirect(userID, p.BotUserID)
if err != nil {
continue
}

post := p.makeBotPost(message, "custom_git_mention")
post.ChannelId = channel.Id
if err = p.client.Post.CreatePost(post); err != nil {
p.client.Log.Warn("Error creating review comment mention post", "error", err.Error())
}

p.sendRefreshEvent(userID)
}
}

func (p *Plugin) handleReviewCommentAuthorNotification(event *github.PullRequestReviewCommentEvent) {
author := event.GetPullRequest().GetUser().GetLogin()
if strings.EqualFold(author, event.GetSender().GetLogin()) {
return
}

if event.GetAction() != actionCreated {
return
}

authorUserID := p.getGitHubToUserIDMapping(author)
if authorUserID == "" {
return
}

if event.GetRepo().GetPrivate() && !p.permissionToRepo(authorUserID, event.GetRepo().GetFullName()) {
return
}

if p.senderMutedByReceiver(authorUserID, event.GetSender().GetLogin()) {
return
}

message, err := renderTemplate("reviewCommentAuthorNotification", event)
if err != nil {
p.client.Log.Warn("Failed to render template", "error", err.Error())
return
}

p.CreateBotDMPost(authorUserID, message, "custom_git_author")
p.sendRefreshEvent(authorUserID)
}

func (p *Plugin) handleCommentMentionNotification(event *github.IssueCommentEvent) {
action := event.GetAction()
if action == actionEdited || action == actionDeleted {
Expand Down Expand Up @@ -1205,6 +1302,11 @@ func (p *Plugin) handleCommentAuthorNotification(event *github.IssueCommentEvent
}

func (p *Plugin) handleCommentAssigneeNotification(event *github.IssueCommentEvent) {
action := event.GetAction()
if action == actionEdited || action == actionDeleted {
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@nang2049 nang2049 May 19, 2026

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We can check if handleCommentAssigneeNotification caller already filters out edit and delete actions. If yes this guard is dead code.

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@avasconcelos114 avasconcelos114 May 19, 2026

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The caller (handleWebhook) doesn't filter out by action, this has been done for each individual handler previously but this handler in particular was missing it

I'm wondering if we want to move the guard up to handleWebhook but not entirely certain as this would deviate from how every other webhook event is processed (specific action-related guards happening at the handler function-level), what do you think works best here?

return
}

author := event.GetIssue().GetUser().GetLogin()
assignees := event.GetIssue().Assignees
repoName := event.GetRepo().GetFullName()
Expand Down
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