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// Copyright 2016 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package mailer
import (
"bytes"
"context"
"encoding/base64"
"fmt"
"html/template"
"io"
"mime"
"regexp"
"strings"
texttmpl "text/template"
repo_model "code.gitea.io/gitea/models/repo"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/httplib"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/storage"
"code.gitea.io/gitea/modules/typesniffer"
sender_service "code.gitea.io/gitea/services/mailer/sender"
"golang.org/x/net/html"
)
const mailMaxSubjectRunes = 256 // There's no actual limit for subject in RFC 5322
var (
bodyTemplates *template.Template
subjectTemplates *texttmpl.Template
subjectRemoveSpaces = regexp.MustCompile(`[\s]+`)
)
// SendTestMail sends a test mail
func SendTestMail(email string) error {
if setting.MailService == nil {
// No mail service configured
return nil
}
return sender_service.Send(sender, sender_service.NewMessage(email, "Gitea Test Email!", "Gitea Test Email!"))
}
func sanitizeSubject(subject string) string {
runes := []rune(strings.TrimSpace(subjectRemoveSpaces.ReplaceAllLiteralString(subject, " ")))
if len(runes) > mailMaxSubjectRunes {
runes = runes[:mailMaxSubjectRunes]
}
// Encode non-ASCII characters
return mime.QEncoding.Encode("utf-8", string(runes))
}
type mailAttachmentBase64Embedder struct {
doer *user_model.User
repo *repo_model.Repository
maxSize int64
estimateSize int64
}
func newMailAttachmentBase64Embedder(doer *user_model.User, repo *repo_model.Repository, maxSize int64) *mailAttachmentBase64Embedder {
return &mailAttachmentBase64Embedder{doer: doer, repo: repo, maxSize: maxSize}
}
func (b64embedder *mailAttachmentBase64Embedder) Base64InlineImages(ctx context.Context, body template.HTML) (template.HTML, error) {
doc, err := html.Parse(strings.NewReader(string(body)))
if err != nil {
return "", fmt.Errorf("html.Parse failed: %w", err)
}
b64embedder.estimateSize = int64(len(string(body)))
var processNode func(*html.Node)
processNode = func(n *html.Node) {
if n.Type == html.ElementNode {
if n.Data == "img" {
for i, attr := range n.Attr {
if attr.Key == "src" {
attachmentSrc := attr.Val
dataURI, err := b64embedder.AttachmentSrcToBase64DataURI(ctx, attachmentSrc)
if err != nil {
// Not an error, just skip. This is probably an image from outside the gitea instance.
log.Trace("Unable to embed attachment %q to mail body: %v", attachmentSrc, err)
} else {
n.Attr[i].Val = dataURI
}
break
}
}
}
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
processNode(c)
}
}
processNode(doc)
var buf bytes.Buffer
err = html.Render(&buf, doc)
if err != nil {
return "", fmt.Errorf("html.Render failed: %w", err)
}
return template.HTML(buf.String()), nil
}
func (b64embedder *mailAttachmentBase64Embedder) AttachmentSrcToBase64DataURI(ctx context.Context, attachmentSrc string) (string, error) {
parsedSrc := httplib.ParseGiteaSiteURL(ctx, attachmentSrc)
var attachmentUUID string
if parsedSrc != nil {
var ok bool
attachmentUUID, ok = strings.CutPrefix(parsedSrc.RoutePath, "/attachments/")
if !ok {
attachmentUUID, ok = strings.CutPrefix(parsedSrc.RepoSubPath, "/attachments/")
}
if !ok {
return "", fmt.Errorf("not an attachment")
}
}
attachment, err := repo_model.GetAttachmentByUUID(ctx, attachmentUUID)
if err != nil {
return "", err
}
if attachment.RepoID != b64embedder.repo.ID {
return "", fmt.Errorf("attachment does not belong to the repository")
}
if attachment.Size+b64embedder.estimateSize > b64embedder.maxSize {
return "", fmt.Errorf("total embedded images exceed max limit")
}
fr, err := storage.Attachments.Open(attachment.RelativePath())
if err != nil {
return "", err
}
defer fr.Close()
lr := &io.LimitedReader{R: fr, N: b64embedder.maxSize + 1}
content, err := io.ReadAll(lr)
if err != nil {
return "", fmt.Errorf("LimitedReader ReadAll: %w", err)
}
mimeType := typesniffer.DetectContentType(content)
if !mimeType.IsImage() {
return "", fmt.Errorf("not an image")
}
encoded := base64.StdEncoding.EncodeToString(content)
dataURI := fmt.Sprintf("data:%s;base64,%s", mimeType.GetMimeType(), encoded)
b64embedder.estimateSize += int64(len(dataURI))
return dataURI, nil
}
func fromDisplayName(u *user_model.User) string {
if setting.MailService.FromDisplayNameFormatTemplate != nil {
var ctx bytes.Buffer
err := setting.MailService.FromDisplayNameFormatTemplate.Execute(&ctx, map[string]any{
"DisplayName": u.DisplayName(),
"AppName": setting.AppName,
"Domain": setting.Domain,
})
if err == nil {
return mime.QEncoding.Encode("utf-8", ctx.String())
}
log.Error("fromDisplayName: %w", err)
}
return u.GetCompleteName()
}
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