b0913ee804
* fix: resolve multipart email parsing issue * resolve multipart email parsing issue 解决邮件正文被附件覆盖的bug * Update email.go 修改xss过滤
698 lines
17 KiB
Go
698 lines
17 KiB
Go
package parsemail
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import (
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"bytes"
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"crypto/rand"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io"
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"mime"
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"net/textproto"
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"regexp"
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"strings"
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"time"
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"github.com/Jinnrry/pmail/config"
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"github.com/Jinnrry/pmail/models"
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"github.com/Jinnrry/pmail/utils/context"
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"github.com/emersion/go-message"
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_ "github.com/emersion/go-message/charset"
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"github.com/emersion/go-message/mail"
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"github.com/microcosm-cc/bluemonday"
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log "github.com/sirupsen/logrus"
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"github.com/spf13/cast"
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)
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type User struct {
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EmailAddress string `json:"EmailAddress"`
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Name string `json:"Name"`
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}
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func (u User) Build() string {
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if u.Name != "" {
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return fmt.Sprintf("\"%s\" <%s>", mime.QEncoding.Encode("utf-8", u.Name), u.EmailAddress)
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}
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return fmt.Sprintf("<%s>", u.EmailAddress)
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}
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func (u User) GetDomainAccount() (string, string) {
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infos := strings.Split(u.EmailAddress, "@")
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if len(infos) >= 2 {
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return infos[0], infos[1]
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}
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return "", ""
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}
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type Attachment struct {
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Filename string
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ContentType string
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Content []byte
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ContentID string
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}
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// Email is the type used for email messages
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type Email struct {
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ReplyTo []*User
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From *User
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To []*User
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Bcc []*User
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Cc []*User
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Subject string
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Text []byte // Plaintext message (optional)
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HTML []byte // Html message (optional)
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Sender *User // override From as SMTP envelope sender (optional)
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Headers textproto.MIMEHeader
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Attachments []*Attachment
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ReadReceipt []string
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Date string
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Status int // 0未发送，1已发送，2发送失败，3删除，5广告邮件
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MessageId int64
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MsgID string // RFC-compliant Message-ID, persisted in DB
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Size int
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}
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// GenerateMsgID creates an RFC-compliant Message-ID unique enough to avoid spam filters.
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// It must be called once at email creation time and the result persisted to DB.
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func GenerateMsgID(domain string) string {
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randBytes := make([]byte, 16)
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_, _ = rand.Read(randBytes)
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return fmt.Sprintf("%x.%d@%s", randBytes, time.Now().UnixNano(), domain)
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}
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// Xss filter policy
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var (
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strictPolicy *bluemonday.Policy
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relaxedPolicy *bluemonday.Policy
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)
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func init() {
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strictPolicy = bluemonday.StrictPolicy()
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relaxedPolicy = bluemonday.NewPolicy()
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relaxedPolicy.AllowElements("p", "br", "strong", "em", "u", "b", "i", "h1", "h2", "h3", "h4", "h5", "h6")
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relaxedPolicy.AllowElements("div", "span", "center")
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relaxedPolicy.AllowElements("ul", "ol", "li")
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relaxedPolicy.AllowElements("blockquote", "cite")
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relaxedPolicy.AllowElements("table", "tbody", "thead", "tr", "td", "th")
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relaxedPolicy.AllowAttrs("width", "height", "border", "cellpadding", "cellspacing").OnElements("table")
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relaxedPolicy.AllowAttrs("align", "valign", "colspan", "rowspan").OnElements("td", "th")
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relaxedPolicy.AllowAttrs("align").OnElements("tr")
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relaxedPolicy.AllowAttrs("style").Globally()
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relaxedPolicy.AllowAttrs("class", "id").Globally()
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relaxedPolicy.AllowAttrs("bgcolor", "color", "background").Globally()
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relaxedPolicy.AllowAttrs("align").OnElements("p", "div", "h1", "h2", "h3", "h4", "h5", "h6")
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relaxedPolicy.AllowElements("img")
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relaxedPolicy.AllowAttrs("src", "alt", "width", "height", "style", "align").OnElements("img")
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relaxedPolicy.AllowElements("a")
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relaxedPolicy.AllowAttrs("href", "style").OnElements("a")
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relaxedPolicy.RequireNoReferrerOnLinks(true)
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relaxedPolicy.AddTargetBlankToFullyQualifiedLinks(true)
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relaxedPolicy.RequireNoFollowOnLinks(true)
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relaxedPolicy.AllowElements("font")
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relaxedPolicy.AllowAttrs("size", "color", "face").OnElements("font")
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relaxedPolicy.AllowElements("style")
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relaxedPolicy.AllowAttrs("type").OnElements("style")
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relaxedPolicy.AllowURLSchemes("http", "https", "mailto")
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relaxedPolicy.SkipElementsContent("script", "object", "embed", "iframe", "frame", "frameset")
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}
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func sanitizeHTML(htmlContent string) string {
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if htmlContent == "" {
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return ""
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}
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sanitized := relaxedPolicy.Sanitize(htmlContent)
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dataUrlRegex := regexp.MustCompile(`href\s*=\s*["']data:[^"']*["']`)
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sanitized = dataUrlRegex.ReplaceAllString(sanitized, `rel="nofollow"`)
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jsUrlRegex := regexp.MustCompile(`href\s*=\s*["']javascript:[^"']*["']`)
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sanitized = jsUrlRegex.ReplaceAllString(sanitized, `rel="nofollow"`)
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expressionRegex := regexp.MustCompile(`(?i)expression\s*\(.*?\)`)
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sanitized = expressionRegex.ReplaceAllString(sanitized, "")
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styleExpressionRegex := regexp.MustCompile(`(?i)style\s*=\s*["'][^"']*expression[^"']*["']`)
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sanitized = styleExpressionRegex.ReplaceAllString(sanitized, "")
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cssJsRegex := regexp.MustCompile(`(?i)javascript\s*:`)
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sanitized = cssJsRegex.ReplaceAllString(sanitized, "")
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return sanitized
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}
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// Sanitize Text
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func sanitizeText(text string) string {
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return strictPolicy.Sanitize(text)
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}
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func users2String(users []*User) string {
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ret := ""
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for _, user := range users {
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if ret != "" {
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ret += ", "
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}
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ret += user.Build()
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}
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return ret
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}
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func (e *Email) BuildTo2String() string {
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return users2String(e.To)
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}
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func (e *Email) BuildCc2String() string {
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return users2String(e.Cc)
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}
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func (e *Email) BuildBcc2String() string {
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return users2String(e.Bcc)
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}
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func NewEmailFromModel(d models.Email) *Email {
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var To []*User
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json.Unmarshal([]byte(d.To), &To)
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var ReplyTo []*User
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json.Unmarshal([]byte(d.ReplyTo), &ReplyTo)
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var Sender *User
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json.Unmarshal([]byte(d.Sender), &Sender)
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var Bcc []*User
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json.Unmarshal([]byte(d.Bcc), &Bcc)
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var Cc []*User
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json.Unmarshal([]byte(d.Cc), &Cc)
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var Attachments []*Attachment
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json.Unmarshal([]byte(d.Attachments), &Attachments)
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return &Email{
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MessageId: cast.ToInt64(d.Id),
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MsgID: d.MsgID,
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From: &User{
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Name: d.FromName,
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EmailAddress: d.FromAddress,
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},
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To: To,
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Subject: d.Subject,
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Text: []byte(d.Text.String),
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HTML: []byte(d.Html.String),
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Sender: Sender,
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ReplyTo: ReplyTo,
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Bcc: Bcc,
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Cc: Cc,
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Attachments: Attachments,
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Date: d.SendDate.Format("2006-01-02 15:04:05"),
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}
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}
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func NewEmailFromReader(to []string, r io.Reader, size int) *Email {
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ret := &Email{}
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m, err := message.Read(r)
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if err != nil {
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log.Errorf("email解析错误！ Error %+v", err)
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}
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ret.Size = size
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// Preserve the original Message-ID from the sender so it is stored and reused consistently.
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if mid := m.Header.Get("Message-Id"); mid != "" {
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ret.MsgID = strings.TrimPrefix(strings.TrimSuffix(strings.TrimSpace(mid), ">"), "<")
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}
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ret.From = buildUser(m.Header.Get("From"))
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smtpTo := buildUsers(to)
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ret.To = buildUsers(m.Header.Values("To"))
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ret.Bcc = []*User{}
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for _, user := range smtpTo {
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in := false
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for _, u := range ret.To {
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if u.EmailAddress == user.EmailAddress {
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in = true
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break
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}
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}
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if !in {
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ret.Bcc = append(ret.Bcc, user)
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}
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}
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ret.Cc = buildUsers(m.Header.Values("Cc"))
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ret.ReplyTo = buildUsers(m.Header.Values("ReplyTo"))
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ret.Sender = buildUser(m.Header.Get("Sender"))
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if ret.Sender == nil {
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ret.Sender = ret.From
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}
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subject, _ := m.Header.Text("Subject")
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ret.Subject = strictPolicy.Sanitize(subject)
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sendTime, err := time.Parse(time.RFC1123Z, m.Header.Get("Date"))
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if err != nil {
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sendTime = time.Now()
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}
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ret.Date = sendTime.Format(time.DateTime)
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m.Walk(func(path []int, entity *message.Entity, err error) error {
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return formatContent(entity, ret)
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})
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if ret.From != nil {
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ret.From.Name = strictPolicy.Sanitize(ret.From.Name)
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ret.From.EmailAddress = strictPolicy.Sanitize(ret.From.EmailAddress)
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}
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return ret
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}
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func formatContent(entity *message.Entity, ret *Email) error {
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contentType, p, err := entity.Header.ContentType()
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if err != nil {
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log.Errorf("email read error! %+v", err)
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return err
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}
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disp := strings.ToLower(entity.Header.Get("Content-Disposition"))
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isAttachment := strings.Contains(disp, "attachment")
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switch contentType {
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case "multipart/alternative":
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case "multipart/mixed":
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case "text/plain":
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body, _ := io.ReadAll(entity.Body)
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if isAttachment {
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fileName := getFileName(entity, p)
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ret.Attachments = append(ret.Attachments, &Attachment{
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Filename: sanitizeText(fileName),
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ContentType: sanitizeText(strings.TrimSpace(contentType)),
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Content: body,
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ContentID: strings.TrimPrefix(strings.TrimSuffix(entity.Header.Get("Content-Id"), ">"), "<"),
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})
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return nil
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}
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ret.Text = []byte(strictPolicy.Sanitize(string(body)))
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case "text/html":
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body, _ := io.ReadAll(entity.Body)
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if isAttachment {
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fileName := getFileName(entity, p)
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ret.Attachments = append(ret.Attachments, &Attachment{
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Filename: sanitizeText(fileName),
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ContentType: sanitizeText(strings.TrimSpace(contentType)),
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Content: body,
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ContentID: strings.TrimPrefix(strings.TrimSuffix(entity.Header.Get("Content-Id"), ">"), "<"),
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})
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return nil
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}
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ret.HTML = []byte(relaxedPolicy.Sanitize(string(body)))
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case "multipart/related":
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entity.Walk(func(path []int, entity *message.Entity, err error) error {
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if t, _, _ := entity.Header.ContentType(); t == "multipart/related" {
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return nil
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}
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return formatContent(entity, ret)
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})
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default:
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c, _ := io.ReadAll(entity.Body)
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fileName := getFileName(entity, p)
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ret.Attachments = append(ret.Attachments, &Attachment{
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Filename: sanitizeText(fileName),
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ContentType: sanitizeText(strings.TrimSpace(contentType)),
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Content: c,
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ContentID: strings.TrimPrefix(strings.TrimSuffix(entity.Header.Get("Content-Id"), ">"), "<"),
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})
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}
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return nil
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}
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func getFileName(entity *message.Entity, p map[string]string) string {
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fileName := p["name"]
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if fileName != "" {
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return fileName
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}
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contentDisposition := entity.Header.Get("Content-Disposition")
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filenameRegex := regexp.MustCompile(`filename\s*=\s*"?([^";]+)"?`)
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matches := filenameRegex.FindStringSubmatch(contentDisposition)
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if len(matches) >= 2 {
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return strings.Trim(strings.TrimSpace(matches[1]), `"`)
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}
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return "no_name_file"
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}
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func BuilderUser(str string) *User {
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return buildUser(str)
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}
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var emailAddressRe = regexp.MustCompile(`<(.*@.*)>`)
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func buildUser(str string) *User {
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str = strings.TrimSpace(str)
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if str == "" {
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return &User{}
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}
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user := &User{}
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addr, err := mail.ParseAddress(str)
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if err == nil {
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user.EmailAddress = strings.TrimSpace(addr.Address)
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name := strings.TrimSpace(addr.Name)
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if name != "" {
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decoder := mime.WordDecoder{}
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if decoded, err := decoder.Decode(name); err == nil {
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name = decoded
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}
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user.Name = strictPolicy.Sanitize(name)
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}
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return user
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}
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matched := emailAddressRe.FindStringSubmatch(str)
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if len(matched) == 2 {
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user.EmailAddress = strings.TrimSpace(matched[1])
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namePart := strings.ReplaceAll(str, matched[0], "")
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namePart = strings.Trim(strings.TrimSpace(namePart), "\"")
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decoder := mime.WordDecoder{}
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if decoded, err := decoder.Decode(strings.ReplaceAll(namePart, "\"", "")); err == nil {
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user.Name = strictPolicy.Sanitize(strings.TrimSpace(decoded))
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} else {
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user.Name = strictPolicy.Sanitize(strings.TrimSpace(namePart))
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}
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} else {
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user.EmailAddress = strictPolicy.Sanitize(str)
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}
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return user
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}
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func buildUsers(strs []string) []*User {
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var ret []*User
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for _, line := range strs {
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if strings.TrimSpace(line) == "" {
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continue
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}
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parts := strings.Split(line, ",")
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for _, part := range parts {
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if u := buildUser(strings.TrimSpace(part)); u != nil {
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ret = append(ret, u)
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}
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}
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}
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return ret
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}
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func (e *Email) ForwardBuildBytes(ctx *context.Context, sender *models.User) []byte {
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var b bytes.Buffer
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from := []*mail.Address{{e.From.Name, e.From.EmailAddress}}
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to := []*mail.Address{}
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for _, user := range e.To {
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to = append(to, &mail.Address{
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Name: user.Name,
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Address: user.EmailAddress,
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})
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}
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senderAddress := []*mail.Address{{sender.Name, fmt.Sprintf("%s@%s", sender.Account, config.Instance.Domains[0])}}
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// Create our mail header
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var h mail.Header
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h.SetDate(time.Now())
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h.SetAddressList("From", from)
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h.SetAddressList("Sender", senderAddress)
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h.SetAddressList("To", to)
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h.SetText("Subject", e.Subject)
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if e.MsgID != "" {
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h.SetMessageID(e.MsgID)
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} else {
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h.SetMessageID(fmt.Sprintf("%d@%s", e.MessageId, config.Instance.Domain))
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}
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if len(e.Cc) != 0 {
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cc := []*mail.Address{}
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for _, user := range e.Cc {
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cc = append(cc, &mail.Address{
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Name: user.Name,
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Address: user.EmailAddress,
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})
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}
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h.SetAddressList("Cc", cc)
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}
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// Create a new mail writer
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mw, err := mail.CreateWriter(&b, h)
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if err != nil {
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log.WithContext(ctx).Fatal(err)
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}
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// Create a text part
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tw, err := mw.CreateInline()
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if err != nil {
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log.WithContext(ctx).Fatal(err)
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}
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var th mail.InlineHeader
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th.Set("Content-Type", "text/plain")
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w, err := tw.CreatePart(th)
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if err != nil {
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log.Fatal(err)
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}
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io.WriteString(w, string(e.Text))
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w.Close()
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var html mail.InlineHeader
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html.Set("Content-Type", "text/html")
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w, err = tw.CreatePart(html)
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if err != nil {
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log.Fatal(err)
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}
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io.WriteString(w, string(e.HTML))
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w.Close()
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tw.Close()
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// Create an attachment
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for _, attachment := range e.Attachments {
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var ah mail.AttachmentHeader
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ah.Set("Content-Type", attachment.ContentType)
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ah.SetFilename(attachment.Filename)
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w, err = mw.CreateAttachment(ah)
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if err != nil {
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log.WithContext(ctx).Fatal(err)
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continue
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}
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w.Write(attachment.Content)
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w.Close()
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}
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mw.Close()
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// dkim 签名后返回
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return instance.Sign(b.String())
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}
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func (e *Email) BuildPart(ctx *context.Context, loc []int) []byte {
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if len(loc) == 0 {
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return nil
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}
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// 处理顶层 part (part 1 = alternative, part 2+ = attachments)
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if len(loc) == 1 {
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partIdx := loc[0]
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if partIdx == 1 {
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// Part 1 是 alternative，不能直接获取，需要获取子部分
|
||
return nil
|
||
}
|
||
// Part 2, 3, ... 是附件
|
||
attachIdx := partIdx - 2
|
||
if attachIdx >= 0 && attachIdx < len(e.Attachments) {
|
||
encoded := base64.StdEncoding.EncodeToString(e.Attachments[attachIdx].Content)
|
||
encoded += "\r\n"
|
||
return []byte(encoded)
|
||
}
|
||
return nil
|
||
}
|
||
|
||
// 处理 alternative 的子部分 (1.1, 1.2)
|
||
if loc[0] == 1 && len(loc) >= 2 {
|
||
subIdx := loc[1]
|
||
|
||
// 根据 BODYSTRUCTURE 的构建顺序：先 text，后 html
|
||
// 如果只有一个存在，那个就是 1.1
|
||
hasText := len(e.Text) > 0
|
||
hasHtml := len(e.HTML) > 0
|
||
|
||
if hasText && hasHtml {
|
||
// 两者都有: 1.1=text, 1.2=html
|
||
if subIdx == 1 {
|
||
encoded := base64.StdEncoding.EncodeToString(e.Text)
|
||
encoded += "\r\n"
|
||
return []byte(encoded)
|
||
}
|
||
if subIdx == 2 {
|
||
encoded := base64.StdEncoding.EncodeToString(e.HTML)
|
||
encoded += "\r\n"
|
||
return []byte(encoded)
|
||
}
|
||
} else if hasText {
|
||
// 只有 text: 1.1=text
|
||
if subIdx == 1 {
|
||
encoded := base64.StdEncoding.EncodeToString(e.Text)
|
||
encoded += "\r\n"
|
||
return []byte(encoded)
|
||
}
|
||
} else if hasHtml {
|
||
// 只有 html: 1.1=html
|
||
if subIdx == 1 {
|
||
encoded := base64.StdEncoding.EncodeToString(e.HTML)
|
||
encoded += "\r\n"
|
||
return []byte(encoded)
|
||
}
|
||
}
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
func (e *Email) BuildBytes(ctx *context.Context, dkim bool) []byte {
|
||
var b bytes.Buffer
|
||
|
||
from := []*mail.Address{{e.From.Name, e.From.EmailAddress}}
|
||
to := []*mail.Address{}
|
||
for _, user := range e.To {
|
||
to = append(to, &mail.Address{
|
||
Name: user.Name,
|
||
Address: user.EmailAddress,
|
||
})
|
||
}
|
||
|
||
// Create our mail header
|
||
var h mail.Header
|
||
if e.Date != "" {
|
||
t, err := time.ParseInLocation("2006-01-02 15:04:05", e.Date, time.Local)
|
||
if err != nil {
|
||
log.WithContext(ctx).Errorf("Time Error ! Err:%+v", err)
|
||
h.SetDate(time.Now())
|
||
} else {
|
||
h.SetDate(t)
|
||
}
|
||
} else {
|
||
h.SetDate(time.Now())
|
||
}
|
||
if e.MsgID != "" {
|
||
h.SetMessageID(e.MsgID)
|
||
} else {
|
||
h.SetMessageID(fmt.Sprintf("%d@%s", e.MessageId, config.Instance.Domain))
|
||
}
|
||
h.SetAddressList("From", from)
|
||
h.SetAddressList("Sender", from)
|
||
h.SetAddressList("To", to)
|
||
h.SetText("Subject", e.Subject)
|
||
if len(e.Cc) != 0 {
|
||
cc := []*mail.Address{}
|
||
for _, user := range e.Cc {
|
||
cc = append(cc, &mail.Address{
|
||
Name: user.Name,
|
||
Address: user.EmailAddress,
|
||
})
|
||
}
|
||
h.SetAddressList("Cc", cc)
|
||
}
|
||
|
||
// Create a new mail writer
|
||
mw, err := mail.CreateWriter(&b, h)
|
||
if err != nil {
|
||
log.WithContext(ctx).Fatal(err)
|
||
}
|
||
|
||
// Create a text part
|
||
tw, err := mw.CreateInline()
|
||
if err != nil {
|
||
log.WithContext(ctx).Fatal(err)
|
||
}
|
||
|
||
if len(e.Text) > 0 {
|
||
var th mail.InlineHeader
|
||
th.Header.Set("Content-Transfer-Encoding", "base64")
|
||
th.SetContentType("text/plain", map[string]string{
|
||
"charset": "UTF-8",
|
||
})
|
||
w, err := tw.CreatePart(th)
|
||
if err != nil {
|
||
log.Fatal(err)
|
||
}
|
||
io.WriteString(w, string(e.Text))
|
||
w.Close()
|
||
}
|
||
|
||
var html mail.InlineHeader
|
||
html.SetContentType("text/html", map[string]string{
|
||
"charset": "UTF-8",
|
||
})
|
||
html.Header.Set("Content-Transfer-Encoding", "base64")
|
||
w, err := tw.CreatePart(html)
|
||
if err != nil {
|
||
log.Fatal(err)
|
||
}
|
||
if len(e.HTML) > 0 {
|
||
io.WriteString(w, string(e.HTML))
|
||
} else {
|
||
io.WriteString(w, string(e.Text))
|
||
}
|
||
|
||
w.Close()
|
||
|
||
tw.Close()
|
||
|
||
// Create an attachment
|
||
for _, attachment := range e.Attachments {
|
||
var ah mail.AttachmentHeader
|
||
ah.Set("Content-Type", attachment.ContentType)
|
||
ah.SetFilename(attachment.Filename)
|
||
w, err = mw.CreateAttachment(ah)
|
||
if err != nil {
|
||
log.WithContext(ctx).Fatal(err)
|
||
continue
|
||
}
|
||
w.Write(attachment.Content)
|
||
w.Close()
|
||
}
|
||
|
||
mw.Close()
|
||
|
||
if dkim {
|
||
// dkim 签名后返回
|
||
return instance.Sign(b.String())
|
||
}
|
||
return b.Bytes()
|
||
}
|