From 9fd3368077f7c920157fee83e7e3e433b7a0783e Mon Sep 17 00:00:00 2001
From: Dylan Arbour <dylan.arbour@gmail.com>
Date: Mon, 7 Sep 2020 14:55:43 -0400
Subject: [PATCH] Add text field to Slack Alert

---
 README.md             |  2 ++
 concourse/resource.go |  2 ++
 out/alert.go          | 12 ++++++++++--
 out/alert_test.go     |  4 ++--
 out/main.go           | 14 ++++++++++++++
 slack/slack.go        |  1 +
 6 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 650906c..a7eaaa3 100644
--- a/README.md
+++ b/README.md
@@ -49,6 +49,8 @@ Sends a structured message to Slack based on the alert type.
 - `channel_file`: *Optional.* File containing text which overrides `channel`. If the file cannot be read, `channel` will be used instead.
 - `message`: *Optional.* The status message at the top of the alert. Defaults to name of alert type.
 - `message_file`: *Optional.* File containing text which overrides `message`. If the file cannot be read, `message` will be used instead.
+- `text`: *Optional.* The status text at the top of the alert. Defaults to name of alert type.
+- `text_file`: *Optional.* File containing text which overrides `text`. If the file cannot be read, `text` will be used instead.
 - `color`: *Optional.* The color of the notification bar as a hexadecimal. Defaults to the icon color of the alert type.
 - `disable`: *Optional.* Disables the alert. Defaults to `false`.
 
diff --git a/concourse/resource.go b/concourse/resource.go
index ecbc345..b339dd5 100644
--- a/concourse/resource.go
+++ b/concourse/resource.go
@@ -37,6 +37,8 @@ type OutParams struct {
 	Color       string `json:"color"`
 	Message     string `json:"message"`
 	MessageFile string `json:"message_file"`
+	Text        string `json:"text"`
+	TextFile    string `json:"text_file"`
 	Disable     bool   `json:"disable"`
 }
 
diff --git a/out/alert.go b/out/alert.go
index aed0daa..1656e57 100644
--- a/out/alert.go
+++ b/out/alert.go
@@ -11,6 +11,8 @@ type Alert struct {
 	IconURL     string
 	Message     string
 	MessageFile string
+	Text        string
+	TextFile    string
 	Disabled    bool
 }
 
@@ -73,17 +75,23 @@ func NewAlert(input *concourse.OutRequest) Alert {
 	if alert.Disabled == false {
 		alert.Disabled = input.Source.Disable
 	}
+
 	alert.Channel = input.Params.Channel
 	if alert.Channel == "" {
 		alert.Channel = input.Source.Channel
 	}
+	alert.ChannelFile = input.Params.ChannelFile
+
 	if input.Params.Message != "" {
 		alert.Message = input.Params.Message
 	}
+	alert.MessageFile = input.Params.MessageFile
+
 	if input.Params.Color != "" {
 		alert.Color = input.Params.Color
 	}
-	alert.MessageFile = input.Params.MessageFile
-	alert.ChannelFile = input.Params.ChannelFile
+
+	alert.Text = input.Params.Text
+	alert.TextFile = input.Params.TextFile
 	return alert
 }
diff --git a/out/alert_test.go b/out/alert_test.go
index 3aa474a..a12609a 100644
--- a/out/alert_test.go
+++ b/out/alert_test.go
@@ -20,9 +20,9 @@ func TestNewAlert(t *testing.T) {
 		"custom params": {
 			input: &concourse.OutRequest{
 				Source: concourse.Source{Channel: "general"},
-				Params: concourse.OutParams{Channel: "custom-channel", Color: "#ffffff", Message: "custom-message", Disable: true},
+				Params: concourse.OutParams{Channel: "custom-channel", Color: "#ffffff", Message: "custom-message", Text: "custom-text", Disable: true},
 			},
-			want: Alert{Type: "default", Channel: "custom-channel", Color: "#ffffff", IconURL: "https://ci.concourse-ci.org/public/images/favicon-pending.png", Message: "custom-message", Disabled: true},
+			want: Alert{Type: "default", Channel: "custom-channel", Color: "#ffffff", IconURL: "https://ci.concourse-ci.org/public/images/favicon-pending.png", Message: "custom-message", Text: "custom-text", Disabled: true},
 		},
 		"custom source": {
 			input: &concourse.OutRequest{
diff --git a/out/main.go b/out/main.go
index d1c5f16..0fba9fa 100644
--- a/out/main.go
+++ b/out/main.go
@@ -18,6 +18,7 @@ import (
 func buildMessage(alert Alert, m concourse.BuildMetadata, path string) *slack.Message {
 	message := alert.Message
 	channel := alert.Channel
+	text := alert.Text
 
 	// Open and read message file if set
 	if alert.MessageFile != "" {
@@ -43,6 +44,18 @@ func buildMessage(alert Alert, m concourse.BuildMetadata, path string) *slack.Me
 		}
 	}
 
+	// Open and read text file if set
+	if alert.TextFile != "" {
+		file := filepath.Join(path, alert.TextFile)
+		f, err := ioutil.ReadFile(file)
+
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "error reading text_file: %v\nwill default to text instead\n", err)
+		} else {
+			text = strings.TrimSpace(string(f))
+		}
+	}
+
 	attachment := slack.Attachment{
 		Fallback:   fmt.Sprintf("%s -- %s", fmt.Sprintf("%s: %s/%s/%s", message, m.PipelineName, m.JobName, m.BuildName), m.URL),
 		AuthorName: message,
@@ -61,6 +74,7 @@ func buildMessage(alert Alert, m concourse.BuildMetadata, path string) *slack.Me
 				Short: true,
 			},
 		},
+		Text: text,
 	}
 
 	return &slack.Message{Attachments: []slack.Attachment{attachment}, Channel: channel}
diff --git a/slack/slack.go b/slack/slack.go
index a36f81d..7562e0a 100644
--- a/slack/slack.go
+++ b/slack/slack.go
@@ -23,6 +23,7 @@ type Attachment struct {
 	Fields     []Field `json:"fields"`
 	Footer     string  `json:"footer"`
 	FooterIcon string  `json:"footer_icon"`
+	Text       string  `json:"text"`
 }
 
 // Field represents a Slack API message attachment's fields