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gitea/services/webhook/matrix.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

280 lines
8.9 KiB
Go

// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package webhook
import (
"bytes"
"context"
"crypto/sha1"
"encoding/hex"
"fmt"
"net/http"
"net/url"
"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"
"code.gitea.io/gitea/modules/util"
webhook_module "code.gitea.io/gitea/modules/webhook"
)
func newMatrixRequest(ctx context.Context, w *webhook_model.Webhook, t *webhook_model.HookTask) (*http.Request, []byte, error) {
meta := &MatrixMeta{}
if err := json.Unmarshal([]byte(w.Meta), meta); err != nil {
return nil, nil, fmt.Errorf("GetMatrixPayload meta json: %w", err)
}
mc := matrixConvertor{
MsgType: messageTypeText[meta.MessageType],
}
payload, err := newPayload(mc, []byte(t.PayloadContent), t.EventType)
if err != nil {
return nil, nil, err
}
body, err := json.MarshalIndent(payload, "", " ")
if err != nil {
return nil, nil, err
}
txnID, err := getMatrixTxnID(body)
if err != nil {
return nil, nil, err
}
req, err := http.NewRequest(http.MethodPut, w.URL+"/"+txnID, bytes.NewReader(body))
if err != nil {
return nil, nil, err
}
req.Header.Set("Content-Type", "application/json")
return req, body, addDefaultHeaders(req, []byte(w.Secret), t, body) // likely useless, but has always been sent historially
}
const matrixPayloadSizeLimit = 1024 * 64
// MatrixMeta contains the Matrix metadata
type MatrixMeta struct {
HomeserverURL string `json:"homeserver_url"`
Room string `json:"room_id"`
MessageType int `json:"message_type"`
}
var messageTypeText = map[int]string{
1: "m.notice",
2: "m.text",
}
// GetMatrixHook returns Matrix metadata
func GetMatrixHook(w *webhook_model.Webhook) *MatrixMeta {
s := &MatrixMeta{}
if err := json.Unmarshal([]byte(w.Meta), s); err != nil {
log.Error("webhook.GetMatrixHook(%d): %v", w.ID, err)
}
return s
}
// MatrixPayload contains payload for a Matrix room
type MatrixPayload struct {
Body string `json:"body"`
MsgType string `json:"msgtype"`
Format string `json:"format"`
FormattedBody string `json:"formatted_body"`
Commits []*api.PayloadCommit `json:"io.gitea.commits,omitempty"`
}
var _ payloadConvertor[MatrixPayload] = matrixConvertor{}
type matrixConvertor struct {
MsgType string
}
func (m matrixConvertor) newPayload(text string, commits ...*api.PayloadCommit) (MatrixPayload, error) {
return MatrixPayload{
Body: getMessageBody(text),
MsgType: m.MsgType,
Format: "org.matrix.custom.html",
FormattedBody: text,
Commits: commits,
}, nil
}
// Create implements payloadConvertor Create method
func (m matrixConvertor) Create(p *api.CreatePayload) (MatrixPayload, error) {
repoLink := htmlLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
refLink := MatrixLinkToRef(p.Repo.HTMLURL, p.Ref)
text := fmt.Sprintf("[%s:%s] %s created by %s", repoLink, refLink, p.RefType, p.Sender.UserName)
return m.newPayload(text)
}
// Delete composes Matrix payload for delete a branch or tag.
func (m matrixConvertor) Delete(p *api.DeletePayload) (MatrixPayload, error) {
refName := git.RefName(p.Ref).ShortName()
repoLink := htmlLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
text := fmt.Sprintf("[%s:%s] %s deleted by %s", repoLink, refName, p.RefType, p.Sender.UserName)
return m.newPayload(text)
}
// Fork composes Matrix payload for forked by a repository.
func (m matrixConvertor) Fork(p *api.ForkPayload) (MatrixPayload, error) {
baseLink := htmlLinkFormatter(p.Forkee.HTMLURL, p.Forkee.FullName)
forkLink := htmlLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
text := fmt.Sprintf("%s is forked to %s", baseLink, forkLink)
return m.newPayload(text)
}
// Issue implements payloadConvertor Issue method
func (m matrixConvertor) Issue(p *api.IssuePayload) (MatrixPayload, error) {
text, _, _, _ := getIssuesPayloadInfo(p, htmlLinkFormatter, true)
return m.newPayload(text)
}
// IssueComment implements payloadConvertor IssueComment method
func (m matrixConvertor) IssueComment(p *api.IssueCommentPayload) (MatrixPayload, error) {
text, _, _ := getIssueCommentPayloadInfo(p, htmlLinkFormatter, true)
return m.newPayload(text)
}
// Wiki implements payloadConvertor Wiki method
func (m matrixConvertor) Wiki(p *api.WikiPayload) (MatrixPayload, error) {
text, _, _ := getWikiPayloadInfo(p, htmlLinkFormatter, true)
return m.newPayload(text)
}
// Release implements payloadConvertor Release method
func (m matrixConvertor) Release(p *api.ReleasePayload) (MatrixPayload, error) {
text, _ := getReleasePayloadInfo(p, htmlLinkFormatter, true)
return m.newPayload(text)
}
// Push implements payloadConvertor Push method
func (m matrixConvertor) Push(p *api.PushPayload) (MatrixPayload, error) {
var commitDesc string
if p.TotalCommits == 1 {
commitDesc = "1 commit"
} else {
commitDesc = fmt.Sprintf("%d commits", p.TotalCommits)
}
repoLink := htmlLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
branchLink := MatrixLinkToRef(p.Repo.HTMLURL, p.Ref)
text := fmt.Sprintf("[%s] %s pushed %s to %s:<br>", repoLink, p.Pusher.UserName, commitDesc, branchLink)
// for each commit, generate a new line text
for i, commit := range p.Commits {
text += fmt.Sprintf("%s: %s - %s", htmlLinkFormatter(commit.URL, commit.ID[:7]), commit.Message, commit.Author.Name)
// add linebreak to each commit but the last
if i < len(p.Commits)-1 {
text += "<br>"
}
}
return m.newPayload(text, p.Commits...)
}
// PullRequest implements payloadConvertor PullRequest method
func (m matrixConvertor) PullRequest(p *api.PullRequestPayload) (MatrixPayload, error) {
text, _, _, _ := getPullRequestPayloadInfo(p, htmlLinkFormatter, true)
return m.newPayload(text)
}
// Review implements payloadConvertor Review method
func (m matrixConvertor) Review(p *api.PullRequestPayload, event webhook_module.HookEventType) (MatrixPayload, error) {
senderLink := htmlLinkFormatter(setting.AppURL+url.PathEscape(p.Sender.UserName), p.Sender.UserName)
title := fmt.Sprintf("#%d %s", p.Index, p.PullRequest.Title)
titleLink := htmlLinkFormatter(p.PullRequest.HTMLURL, title)
repoLink := htmlLinkFormatter(p.Repository.HTMLURL, p.Repository.FullName)
var text string
switch p.Action {
case api.HookIssueReviewed:
action, err := parseHookPullRequestEventType(event)
if err != nil {
return MatrixPayload{}, err
}
text = fmt.Sprintf("[%s] Pull request review %s: %s by %s", repoLink, action, titleLink, senderLink)
}
return m.newPayload(text)
}
// Repository implements payloadConvertor Repository method
func (m matrixConvertor) Repository(p *api.RepositoryPayload) (MatrixPayload, error) {
senderLink := htmlLinkFormatter(setting.AppURL+p.Sender.UserName, p.Sender.UserName)
repoLink := htmlLinkFormatter(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 m.newPayload(text)
}
func (m matrixConvertor) Package(p *api.PackagePayload) (MatrixPayload, error) {
senderLink := htmlLinkFormatter(setting.AppURL+p.Sender.UserName, p.Sender.UserName)
packageLink := htmlLinkFormatter(p.Package.HTMLURL, p.Package.Name)
var text string
switch p.Action {
case api.HookPackageCreated:
text = fmt.Sprintf("[%s] Package published by %s", packageLink, senderLink)
case api.HookPackageDeleted:
text = fmt.Sprintf("[%s] Package deleted by %s", packageLink, senderLink)
}
return m.newPayload(text)
}
var urlRegex = regexp.MustCompile(`<a [^>]*?href="([^">]*?)">(.*?)</a>`)
func getMessageBody(htmlText string) string {
htmlText = urlRegex.ReplaceAllString(htmlText, "[$2]($1)")
htmlText = strings.ReplaceAll(htmlText, "<br>", "\n")
return htmlText
}
// getMatrixTxnID computes the transaction ID to ensure idempotency
func getMatrixTxnID(payload []byte) (string, error) {
if len(payload) >= matrixPayloadSizeLimit {
return "", fmt.Errorf("getMatrixTxnID: payload size %d > %d", len(payload), matrixPayloadSizeLimit)
}
h := sha1.New()
_, err := h.Write(payload)
if err != nil {
return "", err
}
return hex.EncodeToString(h.Sum(nil)), nil
}
// MatrixLinkToRef Matrix-formatter link to a repo ref
func MatrixLinkToRef(repoURL, ref string) string {
refName := git.RefName(ref).ShortName()
switch {
case strings.HasPrefix(ref, git.BranchPrefix):
return htmlLinkFormatter(repoURL+"/src/branch/"+util.PathEscapeSegments(refName), refName)
case strings.HasPrefix(ref, git.TagPrefix):
return htmlLinkFormatter(repoURL+"/src/tag/"+util.PathEscapeSegments(refName), refName)
default:
return htmlLinkFormatter(repoURL+"/src/commit/"+util.PathEscapeSegments(refName), refName)
}
}