PLT-7212: fix missing webhook post attachments (#7011)

* fix missing webhook post attachments

* make ProcessSlackAttachments return a new slice instead of modifying it

4 files changed, 21 insertions, 23 deletions

diff --git a/model/command_response.go b/model/command_response.go
index e3253acc0..27d39e173 100644
--- a/model/command_response.go
+++ b/model/command_response.go
@@ -14,12 +14,12 @@ const (
 )
 
 type CommandResponse struct {
-	ResponseType string           `json:"response_type"`
-	Text         string           `json:"text"`
-	Username     string           `json:"username"`
-	IconURL      string           `json:"icon_url"`
-	GotoLocation string           `json:"goto_location"`
-	Attachments  SlackAttachments `json:"attachments"`
+	ResponseType string             `json:"response_type"`
+	Text         string             `json:"text"`
+	Username     string             `json:"username"`
+	IconURL      string             `json:"icon_url"`
+	GotoLocation string             `json:"goto_location"`
+	Attachments  []*SlackAttachment `json:"attachments"`
 }
 
 func (o *CommandResponse) ToJson() string {
@@ -40,7 +40,7 @@ func CommandResponseFromJson(data io.Reader) *CommandResponse {
 	}
 
 	o.Text = ExpandAnnouncement(o.Text)
-	o.Attachments.Process()
+	o.Attachments = ProcessSlackAttachments(o.Attachments)
 
 	return &o
 }
diff --git a/model/incoming_webhook.go b/model/incoming_webhook.go
index de58093ff..ce755f889 100644
--- a/model/incoming_webhook.go
+++ b/model/incoming_webhook.go
@@ -28,13 +28,13 @@ type IncomingWebhook struct {
 }
 
 type IncomingWebhookRequest struct {
-	Text        string           `json:"text"`
-	Username    string           `json:"username"`
-	IconURL     string           `json:"icon_url"`
-	ChannelName string           `json:"channel"`
-	Props       StringInterface  `json:"props"`
-	Attachments SlackAttachments `json:"attachments"`
-	Type        string           `json:"type"`
+	Text        string             `json:"text"`
+	Username    string             `json:"username"`
+	IconURL     string             `json:"icon_url"`
+	ChannelName string             `json:"channel"`
+	Props       StringInterface    `json:"props"`
+	Attachments []*SlackAttachment `json:"attachments"`
+	Type        string             `json:"type"`
 }
 
 func (o *IncomingWebhook) ToJson() string {
@@ -209,7 +209,7 @@ func IncomingWebhookRequestFromJson(data io.Reader) *IncomingWebhookRequest {
 	}
 
 	o.Text = ExpandAnnouncement(o.Text)
-	o.Attachments.Process()
+	o.Attachments = ProcessSlackAttachments(o.Attachments)
 
 	return o
 }
diff --git a/model/slack_attachment.go b/model/slack_attachment.go
index a3199c44c..855838214 100644
--- a/model/slack_attachment.go
+++ b/model/slack_attachment.go
@@ -33,8 +33,6 @@ type SlackAttachmentField struct {
 	Short bool        `json:"short"`
 }
 
-type SlackAttachments []*SlackAttachment
-
 // To mention @channel via a webhook in Slack, the message should contain
 // <!channel>, as explained at the bottom of this article:
 // https://get.slack.help/hc/en-us/articles/202009646-Making-announcements
@@ -51,9 +49,9 @@ func ExpandAnnouncement(text string) string {
 // can be found in the text attribute, or in the pretext, text, title and value
 // attributes of the attachment structure. The Slack attachment structure is
 // documented here: https://api.slack.com/docs/attachments
-func (a *SlackAttachments) Process() {
+func ProcessSlackAttachments(a []*SlackAttachment) []*SlackAttachment {
 	var nonNilAttachments []*SlackAttachment
-	for _, attachment := range *a {
+	for _, attachment := range a {
 		if attachment == nil {
 			continue
 		}
@@ -77,5 +75,5 @@ func (a *SlackAttachments) Process() {
 		}
 		attachment.Fields = nonNilFields
 	}
-	*a = nonNilAttachments
+	return nonNilAttachments
 }
diff --git a/model/slack_attachment_test.go b/model/slack_attachment_test.go
index ff4df888f..2ba32baf2 100644
--- a/model/slack_attachment_test.go
+++ b/model/slack_attachment_test.go
@@ -10,8 +10,8 @@ func TestExpandAnnouncement(t *testing.T) {
 	}
 }
 
-func TestSlackAnnouncementProcess(t *testing.T) {
-	attachments := SlackAttachments{
+func TestProcessSlackAnnouncement(t *testing.T) {
+	attachments := []*SlackAttachment{
 		{
 			Pretext: "<!channel> pretext",
 			Text:    "<!channel> text",
@@ -25,7 +25,7 @@ func TestSlackAnnouncementProcess(t *testing.T) {
 			},
 		}, nil,
 	}
-	attachments.Process()
+	attachments = ProcessSlackAttachments(attachments)
 	if len(attachments) != 1 || len(attachments[0].Fields) != 1 {
 		t.Fail()
 	}