php小编小新为您带来了一篇关于在Go中使用AWS SES v2发送带附件的原始电子邮件的文章。AWS SES v2是一种灵活可靠的电子邮件服务，而Go是一种强大的编程语言，两者的结合能帮助您轻松发送带有附件的原始电子邮件。本文将详细介绍如何使用AWS SES v2 API和Go语言编写代码，以实现这一功能。无论您是初学者还是有经验的开发者，本文都将为您提供清晰的指导，助您顺利完成任务。让我们一起开始吧！
问题内容
我正在尝试创建一个 http 端点来处理从网站提交的表单。
该表单具有以下字段：
- 姓名
- 电子邮件
- 电话
- 电子邮件正文（电子邮件正文的文本）
- 照片（最多 5 张）
然后，我的端点将向 [email protected] 发送一封电子邮件，其中照片作为附件，电子邮件正文如下：
john ([email protected]) says: email body ...
我是 go 新手，但我已经尝试让它工作 2 周了，但仍然没有任何运气。
我现在的代码是：
package aj
import (
"bytes"
"encoding/base64"
"fmt"
"io/ioutil"
"mime"
"net/http"
"net/mail"
"net/textproto"
"os"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/sesv2"
"github.com/aws/aws-sdk-go-v2/service/sesv2/types"
"go.uber.org/zap"
)
const expectedContentType string = "multipart/form-data"
const charset string = "UTF-8"
func FormSubmissionHandler(logger *zap.Logger, emailSender EmailSender) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
logger.Info("running the form submission handler...")
// get the destination email address
destinationEmail := os.Getenv("DESTINATION_EMAIL")
// get the subject line of the email
emailSubject := os.Getenv("EMAIL_SUBJECT")
// enforce a multipart/form-data content-type
contentType := r.Header.Get("content-type")
mediatype, _, err := mime.ParseMediaType(contentType)
if err != nil {
logger.Error("error when parsing the mime type", zap.Error(err))
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if mediatype != expectedContentType {
logger.Error("unsupported content-type", zap.Error(err))
http.Error(w, fmt.Sprintf("api expects %v content-type", expectedContentType), http.StatusUnsupportedMediaType)
return
}
err = r.ParseMultipartForm(10 << 20)
if err != nil {
logger.Error("error parsing form data", zap.Error(err))
http.Error(w, "error parsing form data", http.StatusBadRequest)
return
}
name := r.MultipartForm.Value["name"]
if len(name) == 0 {
logger.Error("name not set", zap.Error(err))
http.Error(w, "api expects name to be set", http.StatusBadRequest)
return
}
email := r.MultipartForm.Value["email"]
if len(email) == 0 {
logger.Error("email not set", zap.Error(err))
http.Error(w, "api expects email to be set", http.StatusBadRequest)
return
}
phone := r.MultipartForm.Value["phone"]
if len(phone) == 0 {
logger.Error("phone not set", zap.Error(err))
http.Error(w, "api expects phone to be set", http.StatusBadRequest)
return
}
body := r.MultipartForm.Value["body"]
if len(body) == 0 {
logger.Error("body not set", zap.Error(err))
http.Error(w, "api expects body to be set", http.StatusBadRequest)
return
}
files := r.MultipartForm.File["photos"]
if len(files) == 0 {
logger.Error("no files were submitted", zap.Error(err))
http.Error(w, "api expects one or more files to be submitted", http.StatusBadRequest)
return
}
emailService := NewEmailService()
sendEmailInput := sesv2.SendEmailInput{}
destination := &types.Destination{
ToAddresses: []string{destinationEmail},
}
// add the attachments to the email
for _, file := range files {
f, err := file.Open()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
defer f.Close()
// not sure what to do here to get the email with the attachements
}
message := &types.RawMessage{
Data: make([]byte, 0), // This must change to be the bytes of the raw message
}
content := &types.EmailContent{
Raw: message,
}
sendEmailInput.Content = content
sendEmailInput.Destination = destination
sendEmailInput.FromEmailAddress = aws.String(email[0])
err = emailService.SendEmail(logger, r.Context(), &sendEmailInput)
if err != nil {
logger.Error("an error occured sending the email", zap.Error(err))
http.Error(w, "error sending email", http.StatusBadRequest)
return
}
w.WriteHeader(http.StatusOK)
})
}
我的理解是（如果我错了，请纠正我）我必须以与此类似的格式构建原始消息。假设这是正确的，我只是不知道如何在 go 中做到这一点
解决方法
为了创建附件，您必须使用 base64 消息内容来 encode。
这里是发送 csv 作为附件的示例：
import (
// ...
secretutils "github.com/alessiosavi/GoGPUtils/aws/secrets"
sesutils "github.com/alessiosavi/GoGPUtils/aws/ses"
)
type MailConf struct {
FromName string `json:"from_name,omitempty"`
FromMail string `json:"from_mail,omitempty"`
To string `json:"to,omitempty"`
CC []string `json:"cc,omitempty"`
}
func SendRawMail(filename string, data []byte) error {
var mailConf MailConf
if err := secretutils.UnmarshalSecret(os.Getenv("XXX_YOUR_SECRET_STORED_IN_AWS"), &mailConf); err != nil {
return err
}
subject := fmt.Sprintf("Found errors for the following file: %s", filename)
var carbonCopy string
if len(mailConf.CC) > 0 {
carbonCopy = stringutils.JoinSeparator(",", mailConf.CC...)
} else {
carbonCopy = ""
}
raw := fmt.Sprintf(`From: "%[1]s" <%[2]s>
To: %[3]s
Cc: %[4]s
Subject: %[5]s
Content-Type: multipart/mixed;
boundary="1"
--1
Content-Type: multipart/alternative;
boundary="sub_1"
--sub_1
Content-Type: string/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Please see the attached file for a list of errors
--sub_1
Content-Type: string/html; charset=utf-8
Content-Transfer-Encoding: quoted-printable
%[6]s
Please see the attached file for the list of the rows.
--sub_1--
--1
Content-Type: string/plain; name="errors_%[6]s"
Content-Description: errors_%[6]s
Content-Disposition: attachment;filename="errors_%[6]s";
creation-date="%[7]s";
Content-Transfer-Encoding: base64
%[8]s
--1--`, mailConf.FromName, mailConf.FromMail, mailConf.To, carbonCopy, subject, strings.Replace(filename, ".csv", ".json", 1), time.Now().Format("2-Jan-06 3.04.05 PM"), base64.StdEncoding.EncodeToString(data))
return sesutils.SendMail([]byte(raw))
}
