308 lines
10 KiB
Go
308 lines
10 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package webhook
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import (
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"crypto/sha1"
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"errors"
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"fmt"
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"html"
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"net/http"
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"net/url"
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"regexp"
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"strings"
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webhook_model "code.gitea.io/gitea/models/webhook"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/json"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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api "code.gitea.io/gitea/modules/structs"
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"code.gitea.io/gitea/modules/util"
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)
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const matrixPayloadSizeLimit = 1024 * 64
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// MatrixMeta contains the Matrix metadata
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type MatrixMeta struct {
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HomeserverURL string `json:"homeserver_url"`
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Room string `json:"room_id"`
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AccessToken string `json:"access_token"`
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MessageType int `json:"message_type"`
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}
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var messageTypeText = map[int]string{
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1: "m.notice",
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2: "m.text",
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}
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// GetMatrixHook returns Matrix metadata
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func GetMatrixHook(w *webhook_model.Webhook) *MatrixMeta {
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s := &MatrixMeta{}
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if err := json.Unmarshal([]byte(w.Meta), s); err != nil {
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log.Error("webhook.GetMatrixHook(%d): %v", w.ID, err)
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}
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return s
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}
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// MatrixPayloadUnsafe contains the (unsafe) payload for a Matrix room
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type MatrixPayloadUnsafe struct {
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MatrixPayloadSafe
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AccessToken string `json:"access_token"`
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}
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var (
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_ PayloadConvertor = &MatrixPayloadUnsafe{}
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)
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// safePayload "converts" a unsafe payload to a safe payload
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func (m *MatrixPayloadUnsafe) safePayload() *MatrixPayloadSafe {
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return &MatrixPayloadSafe{
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Body: m.Body,
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MsgType: m.MsgType,
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Format: m.Format,
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FormattedBody: m.FormattedBody,
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Commits: m.Commits,
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}
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}
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// MatrixPayloadSafe contains (safe) payload for a Matrix room
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type MatrixPayloadSafe struct {
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Body string `json:"body"`
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MsgType string `json:"msgtype"`
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Format string `json:"format"`
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FormattedBody string `json:"formatted_body"`
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Commits []*api.PayloadCommit `json:"io.gitea.commits,omitempty"`
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}
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// JSONPayload Marshals the MatrixPayloadUnsafe to json
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func (m *MatrixPayloadUnsafe) JSONPayload() ([]byte, error) {
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data, err := json.MarshalIndent(m, "", " ")
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if err != nil {
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return []byte{}, err
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}
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return data, nil
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}
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// MatrixLinkFormatter creates a link compatible with Matrix
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func MatrixLinkFormatter(url, text string) string {
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return fmt.Sprintf(`<a href="%s">%s</a>`, html.EscapeString(url), html.EscapeString(text))
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}
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// MatrixLinkToRef Matrix-formatter link to a repo ref
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func MatrixLinkToRef(repoURL, ref string) string {
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refName := git.RefEndName(ref)
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switch {
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case strings.HasPrefix(ref, git.BranchPrefix):
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return MatrixLinkFormatter(repoURL+"/src/branch/"+util.PathEscapeSegments(refName), refName)
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case strings.HasPrefix(ref, git.TagPrefix):
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return MatrixLinkFormatter(repoURL+"/src/tag/"+util.PathEscapeSegments(refName), refName)
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default:
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return MatrixLinkFormatter(repoURL+"/src/commit/"+util.PathEscapeSegments(refName), refName)
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}
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}
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// Create implements PayloadConvertor Create method
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func (m *MatrixPayloadUnsafe) Create(p *api.CreatePayload) (api.Payloader, error) {
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repoLink := MatrixLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
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refLink := MatrixLinkToRef(p.Repo.HTMLURL, p.Ref)
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text := fmt.Sprintf("[%s:%s] %s created by %s", repoLink, refLink, p.RefType, p.Sender.UserName)
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return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
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}
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// Delete composes Matrix payload for delete a branch or tag.
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func (m *MatrixPayloadUnsafe) Delete(p *api.DeletePayload) (api.Payloader, error) {
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refName := git.RefEndName(p.Ref)
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repoLink := MatrixLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
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text := fmt.Sprintf("[%s:%s] %s deleted by %s", repoLink, refName, p.RefType, p.Sender.UserName)
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return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
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}
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// Fork composes Matrix payload for forked by a repository.
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func (m *MatrixPayloadUnsafe) Fork(p *api.ForkPayload) (api.Payloader, error) {
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baseLink := MatrixLinkFormatter(p.Forkee.HTMLURL, p.Forkee.FullName)
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forkLink := MatrixLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
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text := fmt.Sprintf("%s is forked to %s", baseLink, forkLink)
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return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
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}
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// Issue implements PayloadConvertor Issue method
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func (m *MatrixPayloadUnsafe) Issue(p *api.IssuePayload) (api.Payloader, error) {
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text, _, _, _ := getIssuesPayloadInfo(p, MatrixLinkFormatter, true)
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return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
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}
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// IssueComment implements PayloadConvertor IssueComment method
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func (m *MatrixPayloadUnsafe) IssueComment(p *api.IssueCommentPayload) (api.Payloader, error) {
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text, _, _ := getIssueCommentPayloadInfo(p, MatrixLinkFormatter, true)
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return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
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}
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// Release implements PayloadConvertor Release method
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func (m *MatrixPayloadUnsafe) Release(p *api.ReleasePayload) (api.Payloader, error) {
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text, _ := getReleasePayloadInfo(p, MatrixLinkFormatter, true)
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return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
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}
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// Push implements PayloadConvertor Push method
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func (m *MatrixPayloadUnsafe) Push(p *api.PushPayload) (api.Payloader, error) {
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var commitDesc string
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if len(p.Commits) == 1 {
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commitDesc = "1 commit"
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} else {
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commitDesc = fmt.Sprintf("%d commits", len(p.Commits))
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}
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repoLink := MatrixLinkFormatter(p.Repo.HTMLURL, p.Repo.FullName)
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branchLink := MatrixLinkToRef(p.Repo.HTMLURL, p.Ref)
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text := fmt.Sprintf("[%s] %s pushed %s to %s:<br>", repoLink, p.Pusher.UserName, commitDesc, branchLink)
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// for each commit, generate a new line text
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for i, commit := range p.Commits {
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text += fmt.Sprintf("%s: %s - %s", MatrixLinkFormatter(commit.URL, commit.ID[:7]), commit.Message, commit.Author.Name)
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// add linebreak to each commit but the last
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if i < len(p.Commits)-1 {
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text += "<br>"
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}
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}
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return getMatrixPayloadUnsafe(text, p.Commits, m.AccessToken, m.MsgType), nil
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}
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// PullRequest implements PayloadConvertor PullRequest method
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func (m *MatrixPayloadUnsafe) PullRequest(p *api.PullRequestPayload) (api.Payloader, error) {
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text, _, _, _ := getPullRequestPayloadInfo(p, MatrixLinkFormatter, true)
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return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
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}
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// Review implements PayloadConvertor Review method
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func (m *MatrixPayloadUnsafe) Review(p *api.PullRequestPayload, event webhook_model.HookEventType) (api.Payloader, error) {
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senderLink := MatrixLinkFormatter(setting.AppURL+url.PathEscape(p.Sender.UserName), p.Sender.UserName)
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title := fmt.Sprintf("#%d %s", p.Index, p.PullRequest.Title)
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titleLink := fmt.Sprintf("%s/pulls/%d", p.Repository.HTMLURL, p.Index)
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repoLink := MatrixLinkFormatter(p.Repository.HTMLURL, p.Repository.FullName)
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var text string
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switch p.Action {
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case api.HookIssueReviewed:
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action, err := parseHookPullRequestEventType(event)
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if err != nil {
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return nil, err
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}
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text = fmt.Sprintf("[%s] Pull request review %s: [%s](%s) by %s", repoLink, action, title, titleLink, senderLink)
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}
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return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
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}
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// Repository implements PayloadConvertor Repository method
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func (m *MatrixPayloadUnsafe) Repository(p *api.RepositoryPayload) (api.Payloader, error) {
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senderLink := MatrixLinkFormatter(setting.AppURL+p.Sender.UserName, p.Sender.UserName)
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repoLink := MatrixLinkFormatter(p.Repository.HTMLURL, p.Repository.FullName)
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var text string
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switch p.Action {
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case api.HookRepoCreated:
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text = fmt.Sprintf("[%s] Repository created by %s", repoLink, senderLink)
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case api.HookRepoDeleted:
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text = fmt.Sprintf("[%s] Repository deleted by %s", repoLink, senderLink)
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}
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return getMatrixPayloadUnsafe(text, nil, m.AccessToken, m.MsgType), nil
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}
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// GetMatrixPayload converts a Matrix webhook into a MatrixPayloadUnsafe
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func GetMatrixPayload(p api.Payloader, event webhook_model.HookEventType, meta string) (api.Payloader, error) {
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s := new(MatrixPayloadUnsafe)
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matrix := &MatrixMeta{}
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if err := json.Unmarshal([]byte(meta), &matrix); err != nil {
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return s, errors.New("GetMatrixPayload meta json:" + err.Error())
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}
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s.AccessToken = matrix.AccessToken
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s.MsgType = messageTypeText[matrix.MessageType]
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return convertPayloader(s, p, event)
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}
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func getMatrixPayloadUnsafe(text string, commits []*api.PayloadCommit, accessToken, msgType string) *MatrixPayloadUnsafe {
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p := MatrixPayloadUnsafe{}
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p.AccessToken = accessToken
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p.FormattedBody = text
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p.Body = getMessageBody(text)
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p.Format = "org.matrix.custom.html"
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p.MsgType = msgType
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p.Commits = commits
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return &p
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}
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var urlRegex = regexp.MustCompile(`<a [^>]*?href="([^">]*?)">(.*?)</a>`)
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func getMessageBody(htmlText string) string {
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htmlText = urlRegex.ReplaceAllString(htmlText, "[$2]($1)")
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htmlText = strings.ReplaceAll(htmlText, "<br>", "\n")
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return htmlText
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}
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// getMatrixHookRequest creates a new request which contains an Authorization header.
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// The access_token is removed from t.PayloadContent
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func getMatrixHookRequest(w *webhook_model.Webhook, t *webhook_model.HookTask) (*http.Request, error) {
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payloadunsafe := MatrixPayloadUnsafe{}
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if err := json.Unmarshal([]byte(t.PayloadContent), &payloadunsafe); err != nil {
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log.Error("Matrix Hook delivery failed: %v", err)
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return nil, err
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}
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payloadsafe := payloadunsafe.safePayload()
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var payload []byte
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var err error
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if payload, err = json.MarshalIndent(payloadsafe, "", " "); err != nil {
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return nil, err
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}
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if len(payload) >= matrixPayloadSizeLimit {
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return nil, fmt.Errorf("getMatrixHookRequest: payload size %d > %d", len(payload), matrixPayloadSizeLimit)
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}
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t.PayloadContent = string(payload)
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txnID, err := getMatrixTxnID(payload)
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if err != nil {
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return nil, fmt.Errorf("getMatrixHookRequest: unable to hash payload: %+v", err)
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}
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url := fmt.Sprintf("%s/%s", w.URL, url.PathEscape(txnID))
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req, err := http.NewRequest(w.HTTPMethod, url, strings.NewReader(string(payload)))
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if err != nil {
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return nil, err
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Add("Authorization", "Bearer "+payloadunsafe.AccessToken)
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return req, nil
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}
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// getMatrixTxnID creates a txnID based on the payload to ensure idempotency
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func getMatrixTxnID(payload []byte) (string, error) {
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h := sha1.New()
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_, err := h.Write(payload)
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("%x", h.Sum(nil)), nil
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}
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