修复邮箱图片显示逻辑，兼容 google gmail

Author: bjdgyc

README.md

@@ -86,6 +86,7 @@ git clone https://github.com/bjdgyc/anylink.git
 
 
 cd anylink
+bash build_web.sh
 bash build.sh
 
 # 注意使用root权限运行

server/admin/api_user.go

@@ -17,6 +17,7 @@ import (
 	"github.com/bjdgyc/anylink/dbdata"
 	"github.com/bjdgyc/anylink/sessdata"
 	"github.com/skip2/go-qrcode"
+	mail "github.com/xhit/go-simple-mail/v2"
 )
 
 func UserList(w http.ResponseWriter, r *http.Request) {
@@ -272,5 +273,13 @@ func userAccountMail(user *dbdata.User) error {
 		return err
 	}
 	// fmt.Println(w.String())
-	return SendMail(base.Cfg.Issuer+"平台通知", user.Email, w.String())
+	imgData, _ := userOtpQr(user.Id, false)
+	attach := &mail.File{
+		MimeType: "image/png",
+		Name:     "userOtpQr.png",
+		Data:     []byte(imgData),
+		Inline:   true,
+	}
+
+	return SendMail(base.Cfg.Issuer, user.Email, w.String(), attach)
 }

server/admin/common.go

@@ -43,7 +43,7 @@ func GetJwtData(jwtToken string) (map[string]interface{}, error) {
 	return claims, nil
 }
 
-func SendMail(subject, to, htmlBody string) error {
+func SendMail(subject, to, htmlBody string, attach *mail.File) error {
 
 	dataSmtp := &dbdata.SettingSmtp{}
 	err := dbdata.SettingGet(dataSmtp)
@@ -102,6 +102,10 @@ func SendMail(subject, to, htmlBody string) error {
 		AddTo(to).
 		SetSubject(subject)
 
+	if attach != nil {
+		email.Attach(attach)
+	}
+
 	email.SetBody(mail.TextHTML, htmlBody)
 
 	// Call Send and pass the client

server/dbdata/db.go

@@ -183,10 +183,15 @@ const accountMail = `<p>您好:</p>
     用户PIN码: <b>{{.PinCode}}</b> <br/>
     <!-- 
     用户动态码(3天后失效):<br/>
-    <img src="{{.OtpImg}}"/>
+    <img src="{{.OtpImg}}"/><br/>
+
+    用户动态码(请妥善保存):<br/>
+    <img src="{{.OtpImgBase64}}"/><br/>
+
+    下面是兼容 gmail 的写法
     -->
     用户动态码(请妥善保存):<br/>
-    <img src="{{.OtpImgBase64}}"/>
+    <img src="cid:userOtpQr.png" alt="userOtpQr" /><br/>
 </p>
 <div>
     使用说明: