// Copyright 2020 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package webhook import (	"bytes"	"context"	"crypto/sha1"	"encoding/hex"	"fmt"	"html"	"html/template"	"net/http"	"net/url"	"regexp"	"strings" 	webhook_model "forgejo.org/models/webhook"	"forgejo.org/modules/git"	"forgejo.org/modules/json"	"forgejo.org/modules/log"	api "forgejo.org/modules/structs"	"forgejo.org/modules/svg"	"forgejo.org/modules/util"	webhook_module "forgejo.org/modules/webhook"	"forgejo.org/services/forms"	"forgejo.org/services/webhook/shared") type matrixHandler struct{} func (matrixHandler) Type() webhook_module.HookType { return webhook_module.MATRIX } func (matrixHandler) Icon(size int) template.HTML {	return svg.RenderHTML("gitea-matrix", size, "img")} func (matrixHandler) UnmarshalForm(bind func(any)) forms.WebhookForm {	var form struct {		forms.WebhookCoreForm		HomeserverURL string `binding:"Required;ValidUrl"`		RoomID        string `binding:"Required"`		MessageType   int		AccessToken   string `binding:"Required"`	}	bind(&form)	form.AuthorizationHeader = "Bearer " + strings.TrimSpace(form.AccessToken) 	// https://spec.matrix.org/v1.10/client-server-api/#sending-events-to-a-room	return forms.WebhookForm{		WebhookCoreForm: form.WebhookCoreForm,		URL:             fmt.Sprintf("%s/_matrix/client/v3/rooms/%s/send/m.room.message", form.HomeserverURL, url.PathEscape(form.RoomID)),		ContentType:     webhook_model.ContentTypeJSON,		Secret:          "",		HTTPMethod:      http.MethodPut,		Metadata: &MatrixMeta{			HomeserverURL: form.HomeserverURL,			Room:          form.RoomID,			MessageType:   form.MessageType,		},	}} func (matrixHandler) NewRequest(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("matrixHandler.NewRequest meta json: %w", err)	}	mc := matrixConvertor{		MsgType: messageTypeText[meta.MessageType],	}	payload, err := shared.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, nil} const matrixPayloadSizeLimit = 1024 * 64 // MatrixMeta contains the Matrix metadatatype 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",} // Metadata returns Matrix metadatafunc (matrixHandler) Metadata(w *webhook_model.Webhook) any {	s := &MatrixMeta{}	if err := json.Unmarshal([]byte(w.Meta), s); err != nil {		log.Error("matrixHandler.Metadata(%d): %v", w.ID, err)	}	return s} // MatrixPayload contains payload for a Matrix roomtype 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 _ shared.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 methodfunc (m matrixConvertor) Create(p *api.CreatePayload) (MatrixPayload, error) {	refLink := MatrixLinkToRef(p.Repo.HTMLURL, p.Ref)	text := fmt.Sprintf("[%s:%s] %s created by %s", p.Repo.FullName, 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 methodfunc (m matrixConvertor) Issue(p *api.IssuePayload) (MatrixPayload, error) {	text, _, _, _ := getIssuesPayloadInfo(p, htmlLinkFormatter, true) 	return m.newPayload(text)} // IssueComment implements payloadConvertor IssueComment methodfunc (m matrixConvertor) IssueComment(p *api.IssueCommentPayload) (MatrixPayload, error) {	text, _, _ := getIssueCommentPayloadInfo(p, htmlLinkFormatter, true) 	return m.newPayload(text)} // Wiki implements payloadConvertor Wiki methodfunc (m matrixConvertor) Wiki(p *api.WikiPayload) (MatrixPayload, error) {	text, _, _ := getWikiPayloadInfo(p, htmlLinkFormatter, true) 	return m.newPayload(text)} // Release implements payloadConvertor Release methodfunc (m matrixConvertor) Release(p *api.ReleasePayload) (MatrixPayload, error) {	text, _ := getReleasePayloadInfo(p, htmlLinkFormatter, true) 	return m.newPayload(text)} // Push implements payloadConvertor Push methodfunc (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)	} 	refName := html.EscapeString(git.RefName(p.Ref).ShortName())	text := fmt.Sprintf("[%s] %s pushed %s to %s:<br>", p.Repo.FullName, p.Pusher.UserName, commitDesc, refName) 	// 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 methodfunc (m matrixConvertor) PullRequest(p *api.PullRequestPayload) (MatrixPayload, error) {	text, _, _, _ := getPullRequestPayloadInfo(p, htmlLinkFormatter, true) 	return m.newPayload(text)} // Review implements payloadConvertor Review methodfunc (m matrixConvertor) Review(p *api.PullRequestPayload, event webhook_module.HookEventType) (MatrixPayload, error) {	title := fmt.Sprintf("#%d %s", p.Index, p.PullRequest.Title)	titleLink := htmlLinkFormatter(p.PullRequest.HTMLURL, title)	var text string 	if p.Action == api.HookIssueReviewed {		action, err := parseHookPullRequestEventType(event)		if err != nil {			return MatrixPayload{}, err		} 		text = fmt.Sprintf("[%s] Pull request review %s: %s by %s", p.Repository.FullName, action, titleLink, p.Sender.UserName)	} 	return m.newPayload(text)} // Repository implements payloadConvertor Repository methodfunc (m matrixConvertor) Repository(p *api.RepositoryPayload) (MatrixPayload, error) {	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, p.Sender.UserName)	case api.HookRepoDeleted:		text = fmt.Sprintf("[%s] Repository deleted by %s", repoLink, p.Sender.UserName)	}	return m.newPayload(text)} func (m matrixConvertor) Package(p *api.PackagePayload) (MatrixPayload, error) {	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, p.Sender.UserName)	case api.HookPackageDeleted:		text = fmt.Sprintf("[%s] Package deleted by %s", packageLink, p.Sender.UserName)	} 	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 idempotencyfunc 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 reffunc 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)	}}