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plugin.go
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plugin.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"os"
"strings"
textTemplate "text/template"
"github.com/drone/drone-template-lib/template"
"github.com/slack-go/slack"
)
type (
Repo struct {
Owner string
Name string
}
BlockSet struct {
Blocks []json.RawMessage `json:"blocks"`
}
Build struct {
Tag string
Event string
Number int
Parent int
Commit string
Ref string
Branch string
Author Author
Pull string
Message Message
DeployTo string
Status string
Link string
Started int64
Created int64
}
Author struct {
Username string
Name string
Email string
Avatar string
}
Message struct {
msg string
Title string
Body string
}
Config struct {
Webhook string
Channel string
Recipient string
Username string
Template string
Fallback string
ImageURL string
IconURL string
IconEmoji string
Color string
LinkNames bool
CustomBlock string
AccessToken string
Mentions string
CustomTemplate string
Message string
}
Job struct {
Started int64
}
Plugin struct {
Repo Repo
Build Build
Config Config
Job Job
}
)
func (a Author) String() string {
return a.Username
}
func newCommitMessage(m string) Message {
// not checking the length here
// as split will always return at least one element
// check it if using more than the first element
splitMsg := strings.Split(m, "\n")
return Message{
msg: m,
Title: strings.TrimSpace(splitMsg[0]),
Body: strings.TrimSpace(strings.Join(splitMsg[1:], "\n")),
}
}
func (m Message) String() string {
return m.msg
}
func (p Plugin) Exec() error {
var blocks []slack.Block
var channel string
var text string
var fallbackText string
// Determine the channel
if p.Config.Recipient != "" {
channel = prepend("@", p.Config.Recipient)
} else if p.Config.Channel != "" {
channel = prepend("#", p.Config.Channel)
}
// Determine the message and fallback
if p.Config.Template != "" {
var err error
text, err = templateMessage(p.Config.Template, p)
if err != nil {
return err
}
} else if p.Config.Message != "" {
text = p.Config.Message
} else {
text = message(p.Repo, p.Build)
}
// Add mentions to the message
if p.Config.Mentions != "" {
var mentionUserIDs = strings.Split(p.Config.Mentions, ",")
mentions := make([]string, len(mentionUserIDs))
for i, id := range mentionUserIDs {
// Check if the id starts with "@" and format it accordingly
if strings.HasPrefix(id, "@") {
mentions[i] = fmt.Sprintf("<%s>:", id)
} else {
mentions[i] = fmt.Sprintf("<@%s>:", id)
}
}
mentionText := strings.Join(mentions, " ")
text = fmt.Sprintf("%s %s", mentionText, text)
}
if p.Config.CustomTemplate != "" {
// Read JSON from file
var filePath string
switch p.Config.CustomTemplate {
case "basic_success_1":
filePath = "templates/basic_success.json"
case "basic_fail_1":
filePath = "templates/basic_fail.json"
case "success_tagged_deploy_1":
filePath = "templates/success_tag_deploy.json"
case "basic_on_hold_1":
filePath = "templates/basic_on_hold.json"
default:
return fmt.Errorf("invalid template name: %s", p.Config.CustomTemplate)
}
// Read JSON from file
file, err := os.ReadFile(filePath)
if err != nil {
return fmt.Errorf("failed to read template file: %w", err)
}
// Fill in the missing values in the template
tmpl, err := textTemplate.New("template").Parse(string(file))
if err != nil {
return fmt.Errorf("failed to parse template: %w", err)
}
var filledTemplate bytes.Buffer
err = tmpl.Execute(&filledTemplate, p)
if err != nil {
return fmt.Errorf("failed to fill in template values: %w", err)
}
// Parse the filled template JSON into a BlockSet
var blockSet BlockSet
err = json.Unmarshal(filledTemplate.Bytes(), &blockSet)
if err != nil {
return fmt.Errorf("failed to parse filled template JSON: %w", err)
}
// Parse each block into a slack.Block and append to blocks
for _, rawBlock := range blockSet.Blocks {
var blockType struct {
Type string `json:"type"`
}
err := json.Unmarshal(rawBlock, &blockType)
if err != nil {
return fmt.Errorf("failed to parse block type JSON: %w", err)
}
var block slack.Block
switch blockType.Type {
case "section":
block = new(slack.SectionBlock)
case "divider":
block = new(slack.DividerBlock)
case "header":
block = new(slack.HeaderBlock)
case "actions":
block = new(slack.ActionBlock)
default:
return fmt.Errorf("unknown block type: %s", blockType.Type)
}
err = json.Unmarshal(rawBlock, block)
if err != nil {
return fmt.Errorf("failed to parse block JSON: %w", err)
}
blocks = append(blocks, block)
}
text = ""
}
if p.Config.Fallback != "" {
var err error
fallbackText, err = templateMessage(p.Config.Fallback, p)
if err != nil {
return err
}
} else {
fallbackText = fallback(p.Repo, p.Build)
}
// Determine the color
colorText := p.Config.Color
if colorText == "" {
colorText = color(p.Build)
}
// Parse custom blocks if they exist
if p.Config.CustomBlock != "" {
var blockSet BlockSet
err := json.Unmarshal([]byte(p.Config.CustomBlock), &blockSet)
if err != nil {
return fmt.Errorf("could not unmarshal custom block: %w", err)
}
for _, rawMessage := range blockSet.Blocks {
block := new(slack.SectionBlock)
err := json.Unmarshal(rawMessage, block)
if err != nil {
return fmt.Errorf("could not unmarshal individual block: %w", err)
}
blocks = append(blocks, block)
}
}
// If access token is provided, use it
if p.Config.AccessToken != "" {
slackApi := slack.New(p.Config.AccessToken)
_, err := slackApi.AuthTest()
if err != nil {
return fmt.Errorf("failed to authenticate using access token: %w", err)
}
options := []slack.MsgOption{}
if len(blocks) > 0 {
options = append(options, slack.MsgOptionBlocks(blocks...))
} else {
options = append(options, slack.MsgOptionText(text, false))
}
_, _, err = slackApi.PostMessage(channel, options...)
if err != nil {
return fmt.Errorf("failed to post message using access token: %w", err)
}
return nil
}
// Build the attachment
attachment := slack.Attachment{
Color: colorText,
ImageURL: p.Config.ImageURL,
MarkdownIn: []string{"text", "fallback"},
Text: text,
Fallback: fallbackText,
}
// Build the payload
payload := slack.WebhookMessage{
Username: p.Config.Username,
Attachments: []slack.Attachment{attachment},
IconURL: p.Config.IconURL,
IconEmoji: p.Config.IconEmoji,
Channel: channel,
}
// Add custom blocks to the payload if they exist
if len(blocks) > 0 {
payload.Blocks = &slack.Blocks{
BlockSet: blocks,
}
}
// Post the message with the webhook
return slack.PostWebhook(p.Config.Webhook, &payload)
}
func templateMessage(t string, plugin Plugin) (string, error) {
c, err := contents(t)
if err != nil {
return "", fmt.Errorf("could not read template: %w", err)
}
return template.RenderTrim(c, plugin)
}
func message(repo Repo, build Build) string {
return fmt.Sprintf("*%s* <%s|%s/%s#%s> (%s) by %s",
build.Status,
build.Link,
repo.Owner,
repo.Name,
build.Commit[:8],
build.Branch,
build.Author,
)
}
func fallback(repo Repo, build Build) string {
return fmt.Sprintf("%s %s/%s#%s (%s) by %s",
build.Status,
repo.Owner,
repo.Name,
build.Commit[:8],
build.Branch,
build.Author,
)
}
func color(build Build) string {
switch build.Status {
case "success":
return "good"
case "failure", "error", "killed":
return "danger"
default:
return "warning"
}
}
func prepend(prefix, s string) string {
if !strings.HasPrefix(s, prefix) {
return prefix + s
}
return s
}