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gitea/services/webhook/discord.go
zeripath bbffcc3aec
Multiple Escaping Improvements (#17551)
There are multiple places where Gitea does not properly escape URLs that it is building and there are multiple places where it builds urls when there is already a simpler function available to use this.
    
This is an extensive PR attempting to fix these issues.

1. The first commit in this PR looks through all href, src and links in the Gitea codebase and has attempted to catch all the places where there is potentially incomplete escaping.
2. Whilst doing this we will prefer to use functions that create URLs over recreating them by hand.
3. All uses of strings should be directly escaped - even if they are not currently expected to contain escaping characters. The main benefit to doing this will be that we can consider relaxing the constraints on user names and reponames in future. 
4. The next commit looks at escaping in the wiki and re-considers the urls that are used there. Using the improved escaping here wiki files containing '/'. (This implementation will currently still place all of the wiki files the root directory of the repo but this would not be difficult to change.)
5. The title generation in feeds is now properly escaped.
6. EscapePound is no longer needed - urls should be PathEscaped / QueryEscaped as necessary but then re-escaped with Escape when creating html with locales Signed-off-by: Andrew Thornton <art27@cantab.net>

Signed-off-by: Andrew Thornton <art27@cantab.net>
2021-11-16 18:18:25 +00:00

294 lines
8.6 KiB
Go

// Copyright 2017 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 (
"errors"
"fmt"
"strconv"
"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"
)
type (
// DiscordEmbedFooter for Embed Footer Structure.
DiscordEmbedFooter struct {
Text string `json:"text"`
}
// DiscordEmbedAuthor for Embed Author Structure
DiscordEmbedAuthor struct {
Name string `json:"name"`
URL string `json:"url"`
IconURL string `json:"icon_url"`
}
// DiscordEmbedField for Embed Field Structure
DiscordEmbedField struct {
Name string `json:"name"`
Value string `json:"value"`
}
// DiscordEmbed is for Embed Structure
DiscordEmbed struct {
Title string `json:"title"`
Description string `json:"description"`
URL string `json:"url"`
Color int `json:"color"`
Footer DiscordEmbedFooter `json:"footer"`
Author DiscordEmbedAuthor `json:"author"`
Fields []DiscordEmbedField `json:"fields"`
}
// DiscordPayload represents
DiscordPayload struct {
Wait bool `json:"wait"`
Content string `json:"content"`
Username string `json:"username"`
AvatarURL string `json:"avatar_url"`
TTS bool `json:"tts"`
Embeds []DiscordEmbed `json:"embeds"`
}
// DiscordMeta contains the discord metadata
DiscordMeta struct {
Username string `json:"username"`
IconURL string `json:"icon_url"`
}
)
// GetDiscordHook returns discord metadata
func GetDiscordHook(w *webhook_model.Webhook) *DiscordMeta {
s := &DiscordMeta{}
if err := json.Unmarshal([]byte(w.Meta), s); err != nil {
log.Error("webhook.GetDiscordHook(%d): %v", w.ID, err)
}
return s
}
func color(clr string) int {
if clr != "" {
clr = strings.TrimLeft(clr, "#")
if s, err := strconv.ParseInt(clr, 16, 32); err == nil {
return int(s)
}
}
return 0
}
var (
greenColor = color("1ac600")
greenColorLight = color("bfe5bf")
yellowColor = color("ffd930")
greyColor = color("4f545c")
purpleColor = color("7289da")
orangeColor = color("eb6420")
orangeColorLight = color("e68d60")
redColor = color("ff3232")
)
// JSONPayload Marshals the DiscordPayload to json
func (d *DiscordPayload) JSONPayload() ([]byte, error) {
data, err := json.MarshalIndent(d, "", " ")
if err != nil {
return []byte{}, err
}
return data, nil
}
var (
_ PayloadConvertor = &DiscordPayload{}
)
// Create implements PayloadConvertor Create method
func (d *DiscordPayload) Create(p *api.CreatePayload) (api.Payloader, error) {
// created tag/branch
refName := git.RefEndName(p.Ref)
title := fmt.Sprintf("[%s] %s %s created", p.Repo.FullName, p.RefType, refName)
return d.createPayload(p.Sender, title, "", p.Repo.HTMLURL+"/src/"+util.PathEscapeSegments(refName), greenColor), nil
}
// Delete implements PayloadConvertor Delete method
func (d *DiscordPayload) Delete(p *api.DeletePayload) (api.Payloader, error) {
// deleted tag/branch
refName := git.RefEndName(p.Ref)
title := fmt.Sprintf("[%s] %s %s deleted", p.Repo.FullName, p.RefType, refName)
return d.createPayload(p.Sender, title, "", p.Repo.HTMLURL+"/src/"+util.PathEscapeSegments(refName), redColor), nil
}
// Fork implements PayloadConvertor Fork method
func (d *DiscordPayload) Fork(p *api.ForkPayload) (api.Payloader, error) {
title := fmt.Sprintf("%s is forked to %s", p.Forkee.FullName, p.Repo.FullName)
return d.createPayload(p.Sender, title, "", p.Repo.HTMLURL, greenColor), nil
}
// Push implements PayloadConvertor Push method
func (d *DiscordPayload) Push(p *api.PushPayload) (api.Payloader, error) {
var (
branchName = git.RefEndName(p.Ref)
commitDesc string
)
var titleLink string
if len(p.Commits) == 1 {
commitDesc = "1 new commit"
titleLink = p.Commits[0].URL
} else {
commitDesc = fmt.Sprintf("%d new commits", len(p.Commits))
titleLink = p.CompareURL
}
if titleLink == "" {
titleLink = p.Repo.HTMLURL + "/src/" + util.PathEscapeSegments(branchName)
}
title := fmt.Sprintf("[%s:%s] %s", p.Repo.FullName, branchName, commitDesc)
var text string
// for each commit, generate attachment text
for i, commit := range p.Commits {
text += fmt.Sprintf("[%s](%s) %s - %s", commit.ID[:7], commit.URL,
strings.TrimRight(commit.Message, "\r\n"), commit.Author.Name)
// add linebreak to each commit but the last
if i < len(p.Commits)-1 {
text += "\n"
}
}
return d.createPayload(p.Sender, title, text, titleLink, greenColor), nil
}
// Issue implements PayloadConvertor Issue method
func (d *DiscordPayload) Issue(p *api.IssuePayload) (api.Payloader, error) {
title, _, text, color := getIssuesPayloadInfo(p, noneLinkFormatter, false)
return d.createPayload(p.Sender, title, text, p.Issue.HTMLURL, color), nil
}
// IssueComment implements PayloadConvertor IssueComment method
func (d *DiscordPayload) IssueComment(p *api.IssueCommentPayload) (api.Payloader, error) {
title, _, color := getIssueCommentPayloadInfo(p, noneLinkFormatter, false)
return d.createPayload(p.Sender, title, p.Comment.Body, p.Comment.HTMLURL, color), nil
}
// PullRequest implements PayloadConvertor PullRequest method
func (d *DiscordPayload) PullRequest(p *api.PullRequestPayload) (api.Payloader, error) {
title, _, text, color := getPullRequestPayloadInfo(p, noneLinkFormatter, false)
return d.createPayload(p.Sender, title, text, p.PullRequest.HTMLURL, color), nil
}
// Review implements PayloadConvertor Review method
func (d *DiscordPayload) Review(p *api.PullRequestPayload, event webhook_model.HookEventType) (api.Payloader, error) {
var text, title string
var color int
switch p.Action {
case api.HookIssueReviewed:
action, err := parseHookPullRequestEventType(event)
if err != nil {
return nil, err
}
title = fmt.Sprintf("[%s] Pull request review %s: #%d %s", p.Repository.FullName, action, p.Index, p.PullRequest.Title)
text = p.Review.Content
switch event {
case webhook_model.HookEventPullRequestReviewApproved:
color = greenColor
case webhook_model.HookEventPullRequestReviewRejected:
color = redColor
case webhook_model.HookEventPullRequestComment:
color = greyColor
default:
color = yellowColor
}
}
return d.createPayload(p.Sender, title, text, p.PullRequest.HTMLURL, color), nil
}
// Repository implements PayloadConvertor Repository method
func (d *DiscordPayload) Repository(p *api.RepositoryPayload) (api.Payloader, error) {
var title, url string
var color int
switch p.Action {
case api.HookRepoCreated:
title = fmt.Sprintf("[%s] Repository created", p.Repository.FullName)
url = p.Repository.HTMLURL
color = greenColor
case api.HookRepoDeleted:
title = fmt.Sprintf("[%s] Repository deleted", p.Repository.FullName)
color = redColor
}
return d.createPayload(p.Sender, title, "", url, color), nil
}
// Release implements PayloadConvertor Release method
func (d *DiscordPayload) Release(p *api.ReleasePayload) (api.Payloader, error) {
text, color := getReleasePayloadInfo(p, noneLinkFormatter, false)
return d.createPayload(p.Sender, text, p.Release.Note, p.Release.URL, color), nil
}
// GetDiscordPayload converts a discord webhook into a DiscordPayload
func GetDiscordPayload(p api.Payloader, event webhook_model.HookEventType, meta string) (api.Payloader, error) {
s := new(DiscordPayload)
discord := &DiscordMeta{}
if err := json.Unmarshal([]byte(meta), &discord); err != nil {
return s, errors.New("GetDiscordPayload meta json:" + err.Error())
}
s.Username = discord.Username
s.AvatarURL = discord.IconURL
return convertPayloader(s, p, event)
}
func parseHookPullRequestEventType(event webhook_model.HookEventType) (string, error) {
switch event {
case webhook_model.HookEventPullRequestReviewApproved:
return "approved", nil
case webhook_model.HookEventPullRequestReviewRejected:
return "rejected", nil
case webhook_model.HookEventPullRequestComment:
return "comment", nil
default:
return "", errors.New("unknown event type")
}
}
func (d *DiscordPayload) createPayload(s *api.User, title, text, url string, color int) *DiscordPayload {
return &DiscordPayload{
Username: d.Username,
AvatarURL: d.AvatarURL,
Embeds: []DiscordEmbed{
{
Title: title,
Description: text,
URL: url,
Color: color,
Author: DiscordEmbedAuthor{
Name: s.UserName,
URL: setting.AppURL + s.UserName,
IconURL: s.AvatarURL,
},
},
},
}
}