forgejo-federation/services/webhook/matrix.go

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// Copyright 2020 The Gitea 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 webhook
import (
"crypto/sha1"
"errors"
"fmt"
"html"
"net/http"
"regexp"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
api "code.gitea.io/gitea/modules/structs"
jsoniter "github.com/json-iterator/go"
)
const matrixPayloadSizeLimit = 1024 * 64
// MatrixMeta contains the Matrix metadata
type MatrixMeta struct {
HomeserverURL string `json:"homeserver_url"`
Room string `json:"room_id"`
AccessToken string `json:"access_token"`
MessageType int `json:"message_type"`
}
var messageTypeText = map[int]string{
1: "m.notice",
2: "m.text",
}
// GetMatrixHook returns Matrix metadata
func GetMatrixHook(w *models.Webhook) *MatrixMeta {
s := &MatrixMeta{}
json := jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal([]byte(w.Meta), s); err != nil {
log.Error("webhook.GetMatrixHook(%d): %v", w.ID, err)
}
return s
}
// MatrixPayloadUnsafe contains the (unsafe) payload for a Matrix room
type MatrixPayloadUnsafe struct {
MatrixPayloadSafe
AccessToken string `json:"access_token"`
}
var (
_ PayloadConvertor = &MatrixPayloadUnsafe{}
)
// safePayload "converts" a unsafe payload to a safe payload
func (m *MatrixPayloadUnsafe) safePayload() *MatrixPayloadSafe {
return &MatrixPayloadSafe{
Body: m.Body,
MsgType: m.MsgType,
Format: m.Format,
FormattedBody: m.FormattedBody,
Commits: m.Commits,
}
}
// MatrixPayloadSafe contains (safe) payload for a Matrix room
type MatrixPayloadSafe 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"`
}
// JSONPayload Marshals the MatrixPayloadUnsafe to json
func (m *MatrixPayloadUnsafe) JSONPayload() ([]byte, error) {
json := jsoniter.ConfigCompatibleWithStandardLibrary
data, err := json.MarshalIndent(m, "", " ")
if err != nil {
return []byte{}, err
}
return data, nil
}
// MatrixLinkFormatter creates a link compatible with Matrix
func MatrixLinkFormatter(url string, text string) string {
return fmt.Sprintf(`<a href="%s">%s</a>`, html.EscapeString(url), html.EscapeString(text))
}
// MatrixLinkToRef Matrix-formatter link to a repo ref
func MatrixLinkToRef(repoURL, ref string) string {
refName := git.RefEndName(ref)
switch {
case strings.HasPrefix(ref, git.BranchPrefix):
return MatrixLinkFormatter(repoURL+"/src/branch/"+refName, refName)
case strings.HasPrefix(ref, git.TagPrefix):
return MatrixLinkFormatter(repoURL+"/src/tag/"+refName, refName)
default:
return MatrixLinkFormatter(repoURL+"/src/commit/"+refName, refName)
}
}
// Create implements PayloadConvertor Create method
func (m *MatrixPayloadUnsafe) Create(p *api.CreatePayload) (api.Payloader, error) {
repoLink := MatrixLinkFormatter(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 getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
}
// Delete composes Matrix payload for delete a branch or tag.
func (m *MatrixPayloadUnsafe) Delete(p *api.DeletePayload) (api.Payloader, error) {
refName := git.RefEndName(p.Ref)
repoLink := MatrixLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
text := fmt.Sprintf("[%s:%s] %s deleted by %s", repoLink, refName, p.RefType, p.Sender.UserName)
return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
}
// Fork composes Matrix payload for forked by a repository.
func (m *MatrixPayloadUnsafe) Fork(p *api.ForkPayload) (api.Payloader, error) {
baseLink := MatrixLinkFormatter(p.Forkee.HTMLURL, p.Forkee.FullName)
forkLink := MatrixLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
text := fmt.Sprintf("%s is forked to %s", baseLink, forkLink)
return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
}
// Issue implements PayloadConvertor Issue method
func (m *MatrixPayloadUnsafe) Issue(p *api.IssuePayload) (api.Payloader, error) {
text, _, _, _ := getIssuesPayloadInfo(p, MatrixLinkFormatter, true)
return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
}
// IssueComment implements PayloadConvertor IssueComment method
func (m *MatrixPayloadUnsafe) IssueComment(p *api.IssueCommentPayload) (api.Payloader, error) {
text, _, _ := getIssueCommentPayloadInfo(p, MatrixLinkFormatter, true)
return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
}
// Release implements PayloadConvertor Release method
func (m *MatrixPayloadUnsafe) Release(p *api.ReleasePayload) (api.Payloader, error) {
text, _ := getReleasePayloadInfo(p, MatrixLinkFormatter, true)
return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
}
// Push implements PayloadConvertor Push method
func (m *MatrixPayloadUnsafe) Push(p *api.PushPayload) (api.Payloader, error) {
var commitDesc string
if len(p.Commits) == 1 {
commitDesc = "1 commit"
} else {
commitDesc = fmt.Sprintf("%d commits", len(p.Commits))
}
repoLink := MatrixLinkFormatter(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", MatrixLinkFormatter(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 getMatrixPayloadUnsafe(text, p.Commits, m.AccessToken, m.MsgType), nil
}
// PullRequest implements PayloadConvertor PullRequest method
func (m *MatrixPayloadUnsafe) PullRequest(p *api.PullRequestPayload) (api.Payloader, error) {
text, _, _, _ := getPullRequestPayloadInfo(p, MatrixLinkFormatter, true)
return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
}
// Review implements PayloadConvertor Review method
func (m *MatrixPayloadUnsafe) Review(p *api.PullRequestPayload, event models.HookEventType) (api.Payloader, error) {
senderLink := MatrixLinkFormatter(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 := MatrixLinkFormatter(p.Repository.HTMLURL, p.Repository.FullName)
var text string
switch p.Action {
case api.HookIssueReviewed:
action, err := parseHookPullRequestEventType(event)
if err != nil {
return nil, err
}
text = fmt.Sprintf("[%s] Pull request review %s: [%s](%s) by %s", repoLink, action, title, titleLink, senderLink)
}
return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
}
// Repository implements PayloadConvertor Repository method
func (m *MatrixPayloadUnsafe) Repository(p *api.RepositoryPayload) (api.Payloader, error) {
senderLink := MatrixLinkFormatter(setting.AppURL+p.Sender.UserName, p.Sender.UserName)
repoLink := MatrixLinkFormatter(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 getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
}
// GetMatrixPayload converts a Matrix webhook into a MatrixPayloadUnsafe
func GetMatrixPayload(p api.Payloader, event models.HookEventType, meta string) (api.Payloader, error) {
s := new(MatrixPayloadUnsafe)
matrix := &MatrixMeta{}
json := jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal([]byte(meta), &matrix); err != nil {
return s, errors.New("GetMatrixPayload meta json:" + err.Error())
}
s.AccessToken = matrix.AccessToken
s.MsgType = messageTypeText[matrix.MessageType]
return convertPayloader(s, p, event)
}
func getMatrixPayloadUnsafe(text string, commits []*api.PayloadCommit, accessToken, msgType string) *MatrixPayloadUnsafe {
p := MatrixPayloadUnsafe{}
p.AccessToken = accessToken
p.FormattedBody = text
p.Body = getMessageBody(text)
p.Format = "org.matrix.custom.html"
p.MsgType = msgType
p.Commits = commits
return &p
}
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
}
// getMatrixHookRequest creates a new request which contains an Authorization header.
// The access_token is removed from t.PayloadContent
func getMatrixHookRequest(w *models.Webhook, t *models.HookTask) (*http.Request, error) {
payloadunsafe := MatrixPayloadUnsafe{}
json := jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal([]byte(t.PayloadContent), &payloadunsafe); err != nil {
log.Error("Matrix Hook delivery failed: %v", err)
return nil, err
}
payloadsafe := payloadunsafe.safePayload()
var payload []byte
var err error
if payload, err = json.MarshalIndent(payloadsafe, "", " "); err != nil {
return nil, err
}
if len(payload) >= matrixPayloadSizeLimit {
return nil, fmt.Errorf("getMatrixHookRequest: payload size %d > %d", len(payload), matrixPayloadSizeLimit)
}
t.PayloadContent = string(payload)
txnID, err := getMatrixTxnID(payload)
if err != nil {
return nil, fmt.Errorf("getMatrixHookRequest: unable to hash payload: %+v", err)
}
url := fmt.Sprintf("%s/%s", w.URL, txnID)
req, err := http.NewRequest(w.HTTPMethod, url, strings.NewReader(string(payload)))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req.Header.Add("Authorization", "Bearer "+payloadunsafe.AccessToken)
return req, nil
}
// getMatrixTxnID creates a txnID based on the payload to ensure idempotency
func getMatrixTxnID(payload []byte) (string, error) {
h := sha1.New()
_, err := h.Write(payload)
if err != nil {
return "", err
}
return fmt.Sprintf("%x", h.Sum(nil)), nil
}