jelder/bownse

// https://api.slack.com/incoming-webhooks
// curl -X POST --data-urlencode 'payload={"text": "This is posted to <#general> and comes from *monkey-bot*.", "channel": "#general", "username": "monkey-bot", "icon_emoji": ":monkey_face:"}' https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    . "github.com/jelder/goenvmap"
    "net/http"
    "strconv"
)

func init() {
    if !SlackIsConfigured() {
        fmt.Println("Slack is not configured.")
    }
}

func SlackIsConfigured() bool {
    return ENV["SLACK_URL"] != ""
}

type slackMessage struct {
    Text        string            `json:"text,omitempty"`
    UserName    string            `json:"username,omitempty"`
    IconUrl     string            `json:"icon_url,omitempty"`
    IconEmoji   string            `json:"icon_emoji,omitempty"`
    Attachments []slackAttachment `json:"attachments,omitempty"`
}

type slackAttachment struct {
    Fallback   string       `json:"fallback,omitempty"`
    Color      string       `json:"color,omitempty"`
    Pretext    string       `json:"pretext,omitempty"`
    AuthorName string       `json:"author_name,omitempty"`
    AuthorLink string       `json:"author_link,omitempty"`
    AuthorIcon string       `json:"author_icon,omitempty"`
    Title      string       `json:"title,omitempty"`
    TitleLink  string       `json:"title_link,omitempty"`
    Text       string       `json:"text,omitempty"`
    Fields     []slackField `json:"fields,omitempty"`
    ImageThumb string       `json:"image_thumb,omitempty"`
    ImageUrl   string       `json:"image_url,omitempty"`
    MarkdownIn []string     `json:"mrkdwn_in,ommitempty`
}

type slackField struct {
    Title string `json:"title"`
    Value string `json:"value"`
    Short bool   `json:"short"`
}

func SlackRequest(state *HerokuAppState) *http.Request {
    message := slackMessage{
        UserName:  "Heroku Deployment",
        IconUrl:   "https://d1ic07fwm32hlr.cloudfront.net/images/favicon.ico",
        IconEmoji: ":heroku:",
        Attachments: []slackAttachment{
            {
                Fallback:   fmt.Sprintf("%s deployed %s %s", state.User, state.App, state.Release),
                Color:      "#430098",
                AuthorName: state.User,
                Text:       fmt.Sprintf(" %s\n", state.GitLog),
                Title:      fmt.Sprintf("%s %s", state.App, state.Release),
                TitleLink:  state.URL(),
                Fields: []slackField{
                    {
                        Title: "Current Commit",
                        Value: state.Head,
                        Short: true,
                    },
                },
            },
        },
    }

    if state.PrevHead != "" {
        field := slackField{
            Title: "Previous Commit",
            Value: state.PrevHead,
            Short: true,
        }
        message.Attachments[0].Fields = append(message.Attachments[0].Fields, field)
    }

    jsonStr, _ := json.MarshalIndent(message, "", "  ")
    fmt.Printf("%s\n", jsonStr)
    req, _ := http.NewRequest("POST", ENV["SLACK_URL"], bytes.NewBuffer(jsonStr))
    req.Header.Set("Content-Type", "application/json")
    req.Header.Add("Content-Length", strconv.Itoa(len(jsonStr)))

    return req
}