add Slack API webhook support

models/slack.go

@@ -0,0 +1,114 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package models
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"strings"
+)
+
+const (
+	SLACK_COLOR string = "#dd4b39"
+)
+
+type Slack struct {
+	Domain  string `json:"domain"`
+	Token   string `json:"token"`
+	Channel string `json:"channel"`
+}
+
+type SlackPayload struct {
+	Channel     string            `json:"channel"`
+	Text        string            `json:"text"`
+	Username    string            `json:"username"`
+	IconUrl     string            `json:"icon_url"`
+	UnfurlLinks int               `json:"unfurl_links"`
+	LinkNames   int               `json:"link_names"`
+	Attachments []SlackAttachment `json:"attachments"`
+}
+
+type SlackAttachment struct {
+	Color string `json:"color"`
+	Text  string `json:"text"`
+}
+
+func GetSlackURL(domain string, token string) string {
+	return fmt.Sprintf(
+		"https://%s.slack.com/services/hooks/incoming-webhook?token=%s",
+		domain,
+		token,
+	)
+}
+
+func (p SlackPayload) GetJSONPayload() ([]byte, error) {
+	data, err := json.Marshal(p)
+	if err != nil {
+		return []byte{}, err
+	}
+	return data, nil
+}
+
+func GetSlackPayload(p *Payload, meta string) (*SlackPayload, error) {
+	slack := &Slack{}
+	slackPayload := &SlackPayload{}
+	if err := json.Unmarshal([]byte(meta), &slack); err != nil {
+		return slackPayload, errors.New("GetSlackPayload meta json:" + err.Error())
+	}
+
+	// TODO: handle different payload types: push, new branch, delete branch etc.
+	// when they are added to gogs. Only handles push now
+	return getSlackPushPayload(p, slack)
+}
+
+func getSlackPushPayload(p *Payload, slack *Slack) (*SlackPayload, error) {
+	// n new commits
+	refSplit := strings.Split(p.Ref, "/")
+	branchName := refSplit[len(refSplit)-1]
+	var commitString string
+
+	// TODO: add commit compare before/after link when gogs adds it
+	if len(p.Commits) == 1 {
+		commitString = "1 new commit"
+	} else {
+		commitString = fmt.Sprintf("%d new commits", len(p.Commits))
+	}
+
+	text := fmt.Sprintf("[%s:%s] %s pushed by %s", p.Repo.Name, branchName, commitString, p.Pusher.Name)
+	var attachmentText string
+
+	// for each commit, generate attachment text
+	for i, commit := range p.Commits {
+		attachmentText += fmt.Sprintf("<%s|%s>: %s - %s", commit.Url, commit.Id[:7], SlackFormatter(commit.Message), commit.Author.Name)
+		// add linebreak to each commit but the last
+		if i < len(p.Commits)-1 {
+			attachmentText += "\n"
+		}
+	}
+
+	slackAttachments := []SlackAttachment{{Color: SLACK_COLOR, Text: attachmentText}}
+
+	return &SlackPayload{
+		Channel:     slack.Channel,
+		Text:        text,
+		Username:    "gogs",
+		IconUrl:     "https://raw.githubusercontent.com/gogits/gogs/master/public/img/favicon.png",
+		UnfurlLinks: 0,
+		LinkNames:   0,
+		Attachments: slackAttachments,
+	}, nil
+}
+
+// see: https://api.slack.com/docs/formatting
+func SlackFormatter(s string) string {
+	// take only first line of commit
+	first := strings.Split(s, "\n")[0]
+	// replace & < >
+	first = strings.Replace(first, "&", "&amp;", -1)
+	first = strings.Replace(first, "<", "&lt;", -1)
+	first = strings.Replace(first, ">", "&gt;", -1)
+	return first
+}