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gitea/services/webhook/slack.go
oliverpool 26653b196b
Store webhook event in database (#29145)
Refactor the webhook logic, to have the type-dependent processing happen
only in one place.

---

## Current webhook flow

1. An event happens
2. It is pre-processed (depending on the webhook type) and its body is
added to a task queue
3. When the task is processed, some more logic (depending on the webhook
type as well) is applied to make an HTTP request

This means that webhook-type dependant logic is needed in step 2 and 3.
This is cumbersome and brittle to maintain.

Updated webhook flow with this PR:
1. An event happens
2. It is stored as-is and added to a task queue
3. When the task is processed, the event is processed (depending on the
webhook type) to make an HTTP request

So the only webhook-type dependent logic happens in one place (step 3)
which should be much more robust.

## Consequences of the refactor

- the raw event must be stored in the hooktask (until now, the
pre-processed body was stored)
- to ensure that previous hooktasks are correctly sent, a
`payload_version` is added (version 1: the body has already been
pre-process / version 2: the body is the raw event)

So future webhook additions will only have to deal with creating an
http.Request based on the raw event (no need to adjust the code in
multiple places, like currently).

Moreover since this processing happens when fetching from the task
queue, it ensures that the queuing of new events (upon a `git push` for
instance) does not get slowed down by a slow webhook.

As a concrete example, the PR #19307 for custom webhooks, should be
substantially smaller:
- no need to change `services/webhook/deliver.go` 
- minimal change in `services/webhook/webhook.go` (add the new webhook
to the map)
- no need to change all the individual webhook files (since with this
refactor the `*webhook_model.Webhook` is provided as argument)
2024-03-07 23:18:38 +01:00

308 lines
9.9 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package webhook
import (
"context"
"fmt"
"net/http"
"regexp"
"strings"
webhook_model "code.gitea.io/gitea/models/webhook"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
api "code.gitea.io/gitea/modules/structs"
webhook_module "code.gitea.io/gitea/modules/webhook"
)
// SlackMeta contains the slack metadata
type SlackMeta struct {
Channel string `json:"channel"`
Username string `json:"username"`
IconURL string `json:"icon_url"`
Color string `json:"color"`
}
// GetSlackHook returns slack metadata
func GetSlackHook(w *webhook_model.Webhook) *SlackMeta {
s := &SlackMeta{}
if err := json.Unmarshal([]byte(w.Meta), s); err != nil {
log.Error("webhook.GetSlackHook(%d): %v", w.ID, err)
}
return s
}
// SlackPayload contains the information about the slack 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"`
}
// SlackAttachment contains the slack message
type SlackAttachment struct {
Fallback string `json:"fallback"`
Color string `json:"color"`
Title string `json:"title"`
TitleLink string `json:"title_link"`
Text string `json:"text"`
}
// SlackTextFormatter replaces &, <, > with HTML characters
// see: https://api.slack.com/docs/formatting
func SlackTextFormatter(s string) string {
// replace & < >
s = strings.ReplaceAll(s, "&", "&amp;")
s = strings.ReplaceAll(s, "<", "&lt;")
s = strings.ReplaceAll(s, ">", "&gt;")
return s
}
// SlackShortTextFormatter replaces &, <, > with HTML characters
func SlackShortTextFormatter(s string) string {
s = strings.Split(s, "\n")[0]
// replace & < >
s = strings.ReplaceAll(s, "&", "&amp;")
s = strings.ReplaceAll(s, "<", "&lt;")
s = strings.ReplaceAll(s, ">", "&gt;")
return s
}
// SlackLinkFormatter creates a link compatible with slack
func SlackLinkFormatter(url, text string) string {
return fmt.Sprintf("<%s|%s>", url, SlackTextFormatter(text))
}
// SlackLinkToRef slack-formatter link to a repo ref
func SlackLinkToRef(repoURL, ref string) string {
// FIXME: SHA1 hardcoded here
url := git.RefURL(repoURL, ref)
refName := git.RefName(ref).ShortName()
return SlackLinkFormatter(url, refName)
}
// Create implements payloadConvertor Create method
func (s slackConvertor) Create(p *api.CreatePayload) (SlackPayload, error) {
repoLink := SlackLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
refLink := SlackLinkToRef(p.Repo.HTMLURL, p.Ref)
text := fmt.Sprintf("[%s:%s] %s created by %s", repoLink, refLink, p.RefType, p.Sender.UserName)
return s.createPayload(text, nil), nil
}
// Delete composes Slack payload for delete a branch or tag.
func (s slackConvertor) Delete(p *api.DeletePayload) (SlackPayload, error) {
refName := git.RefName(p.Ref).ShortName()
repoLink := SlackLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
text := fmt.Sprintf("[%s:%s] %s deleted by %s", repoLink, refName, p.RefType, p.Sender.UserName)
return s.createPayload(text, nil), nil
}
// Fork composes Slack payload for forked by a repository.
func (s slackConvertor) Fork(p *api.ForkPayload) (SlackPayload, error) {
baseLink := SlackLinkFormatter(p.Forkee.HTMLURL, p.Forkee.FullName)
forkLink := SlackLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
text := fmt.Sprintf("%s is forked to %s", baseLink, forkLink)
return s.createPayload(text, nil), nil
}
// Issue implements payloadConvertor Issue method
func (s slackConvertor) Issue(p *api.IssuePayload) (SlackPayload, error) {
text, issueTitle, attachmentText, color := getIssuesPayloadInfo(p, SlackLinkFormatter, true)
var attachments []SlackAttachment
if attachmentText != "" {
attachmentText = SlackTextFormatter(attachmentText)
issueTitle = SlackTextFormatter(issueTitle)
attachments = append(attachments, SlackAttachment{
Color: fmt.Sprintf("%x", color),
Title: issueTitle,
TitleLink: p.Issue.HTMLURL,
Text: attachmentText,
})
}
return s.createPayload(text, attachments), nil
}
// IssueComment implements payloadConvertor IssueComment method
func (s slackConvertor) IssueComment(p *api.IssueCommentPayload) (SlackPayload, error) {
text, issueTitle, color := getIssueCommentPayloadInfo(p, SlackLinkFormatter, true)
return s.createPayload(text, []SlackAttachment{{
Color: fmt.Sprintf("%x", color),
Title: issueTitle,
TitleLink: p.Comment.HTMLURL,
Text: SlackTextFormatter(p.Comment.Body),
}}), nil
}
// Wiki implements payloadConvertor Wiki method
func (s slackConvertor) Wiki(p *api.WikiPayload) (SlackPayload, error) {
text, _, _ := getWikiPayloadInfo(p, SlackLinkFormatter, true)
return s.createPayload(text, nil), nil
}
// Release implements payloadConvertor Release method
func (s slackConvertor) Release(p *api.ReleasePayload) (SlackPayload, error) {
text, _ := getReleasePayloadInfo(p, SlackLinkFormatter, true)
return s.createPayload(text, nil), nil
}
func (s slackConvertor) Package(p *api.PackagePayload) (SlackPayload, error) {
text, _ := getPackagePayloadInfo(p, SlackLinkFormatter, true)
return s.createPayload(text, nil), nil
}
// Push implements payloadConvertor Push method
func (s slackConvertor) Push(p *api.PushPayload) (SlackPayload, error) {
// n new commits
var (
commitDesc string
commitString string
)
if p.TotalCommits == 1 {
commitDesc = "1 new commit"
} else {
commitDesc = fmt.Sprintf("%d new commits", p.TotalCommits)
}
if len(p.CompareURL) > 0 {
commitString = SlackLinkFormatter(p.CompareURL, commitDesc)
} else {
commitString = commitDesc
}
repoLink := SlackLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
branchLink := SlackLinkToRef(p.Repo.HTMLURL, p.Ref)
text := fmt.Sprintf("[%s:%s] %s pushed by %s", repoLink, branchLink, commitString, p.Pusher.UserName)
var attachmentText string
// for each commit, generate attachment text
for i, commit := range p.Commits {
attachmentText += fmt.Sprintf("%s: %s - %s", SlackLinkFormatter(commit.URL, commit.ID[:7]), SlackShortTextFormatter(commit.Message), SlackTextFormatter(commit.Author.Name))
// add linebreak to each commit but the last
if i < len(p.Commits)-1 {
attachmentText += "\n"
}
}
return s.createPayload(text, []SlackAttachment{{
Color: s.Color,
Title: p.Repo.HTMLURL,
TitleLink: p.Repo.HTMLURL,
Text: attachmentText,
}}), nil
}
// PullRequest implements payloadConvertor PullRequest method
func (s slackConvertor) PullRequest(p *api.PullRequestPayload) (SlackPayload, error) {
text, issueTitle, attachmentText, color := getPullRequestPayloadInfo(p, SlackLinkFormatter, true)
var attachments []SlackAttachment
if attachmentText != "" {
attachmentText = SlackTextFormatter(p.PullRequest.Body)
issueTitle = SlackTextFormatter(issueTitle)
attachments = append(attachments, SlackAttachment{
Color: fmt.Sprintf("%x", color),
Title: issueTitle,
TitleLink: p.PullRequest.HTMLURL,
Text: attachmentText,
})
}
return s.createPayload(text, attachments), nil
}
// Review implements payloadConvertor Review method
func (s slackConvertor) Review(p *api.PullRequestPayload, event webhook_module.HookEventType) (SlackPayload, error) {
senderLink := SlackLinkFormatter(setting.AppURL+p.Sender.UserName, p.Sender.UserName)
title := fmt.Sprintf("#%d %s", p.Index, p.PullRequest.Title)
titleLink := fmt.Sprintf("%s/pulls/%d", p.Repository.HTMLURL, p.Index)
repoLink := SlackLinkFormatter(p.Repository.HTMLURL, p.Repository.FullName)
var text string
switch p.Action {
case api.HookIssueReviewed:
action, err := parseHookPullRequestEventType(event)
if err != nil {
return SlackPayload{}, err
}
text = fmt.Sprintf("[%s] Pull request review %s: [%s](%s) by %s", repoLink, action, title, titleLink, senderLink)
}
return s.createPayload(text, nil), nil
}
// Repository implements payloadConvertor Repository method
func (s slackConvertor) Repository(p *api.RepositoryPayload) (SlackPayload, error) {
senderLink := SlackLinkFormatter(setting.AppURL+p.Sender.UserName, p.Sender.UserName)
repoLink := SlackLinkFormatter(p.Repository.HTMLURL, p.Repository.FullName)
var text string
switch p.Action {
case api.HookRepoCreated:
text = fmt.Sprintf("[%s] Repository created by %s", repoLink, senderLink)
case api.HookRepoDeleted:
text = fmt.Sprintf("[%s] Repository deleted by %s", repoLink, senderLink)
}
return s.createPayload(text, nil), nil
}
func (s slackConvertor) createPayload(text string, attachments []SlackAttachment) SlackPayload {
return SlackPayload{
Channel: s.Channel,
Text: text,
Username: s.Username,
IconURL: s.IconURL,
Attachments: attachments,
}
}
type slackConvertor struct {
Channel string
Username string
IconURL string
Color string
}
var _ payloadConvertor[SlackPayload] = slackConvertor{}
func newSlackRequest(ctx context.Context, w *webhook_model.Webhook, t *webhook_model.HookTask) (*http.Request, []byte, error) {
meta := &SlackMeta{}
if err := json.Unmarshal([]byte(w.Meta), meta); err != nil {
return nil, nil, fmt.Errorf("newSlackRequest meta json: %w", err)
}
sc := slackConvertor{
Channel: meta.Channel,
Username: meta.Username,
IconURL: meta.IconURL,
Color: meta.Color,
}
return newJSONRequest(sc, w, t, true)
}
var slackChannel = regexp.MustCompile(`^#?[a-z0-9_-]{1,80}$`)
// IsValidSlackChannel validates a channel name conforms to what slack expects:
// https://api.slack.com/methods/conversations.rename#naming
// Conversation names can only contain lowercase letters, numbers, hyphens, and underscores, and must be 80 characters or less.
// Gitea accepts if it starts with a #.
func IsValidSlackChannel(name string) bool {
return slackChannel.MatchString(name)
}