attachments-with-mailer-helper.md

Attachments - With Mail Helper Class

package main

import (
  "fmt"
  "log"
  "os"
  "encoding/base64"
  "io/ioutil"
  "github.com/sendgrid/sendgrid-go"
  "github.com/sendgrid/sendgrid-go/helpers/mail"
)

func main() {
  // create new *SGMailV3
  m := mail.NewV3Mail()

  from := mail.NewEmail("test", "[email protected]")
  content := mail.NewContent("text/html", "<p>Sending different attachments.</p>")
  to := mail.NewEmail("Example User", "[email protected]")

  m.SetFrom(from)
  m.AddContent(content)
  
  // create new *Personalization
  personalization := mail.NewPersonalization()
  personalization.AddTos(to)
  personalization.Subject = "Attachments - Demystified!"

  // add `personalization` to `m`
  m.AddPersonalizations(personalization)
  
  // read/attach .txt file
  a_txt := mail.NewAttachment()
  dat, err := ioutil.ReadFile("testing.txt")
  if err != nil {
    fmt.Println(err)
  }
  encoded := base64.StdEncoding.EncodeToString([]byte(dat))
  a_txt.SetContent(encoded)
  a_txt.SetType("text/plain")
  a_txt.SetFilename("testing.txt")
  a_txt.SetDisposition("attachment")
  
  // read/attach .pdf file
  a_pdf := mail.NewAttachment()
  dat, err = ioutil.ReadFile("testing.pdf")
  if err != nil {
    fmt.Println(err)
  }
  encoded = base64.StdEncoding.EncodeToString([]byte(dat))
  a_pdf.SetContent(encoded)
  a_pdf.SetType("application/pdf")
  a_pdf.SetFilename("testing.pdf")
  a_pdf.SetDisposition("attachment")

  // read/attach inline .jpg file
  a_jpg := mail.NewAttachment()
  dat, err = ioutil.ReadFile("testing.jpg")
  if err != nil {
    fmt.Println(err)
  }
  encoded = base64.StdEncoding.EncodeToString([]byte(dat))
  a_jpg.SetContent(encoded)
  a_jpg.SetType("image/jpeg")
  a_jpg.SetFilename("testing.jpg")
  a_jpg.SetDisposition("inline")
  a_jpg.SetContentID("Test Attachment")
  
  // add `a_txt`, `a_pdf` and `a_jpg` to `m`
  m.AddAttachment(a_txt)
  m.AddAttachment(a_pdf)
  m.AddAttachment(a_jpg)  
  
  request := sendgrid.GetRequest(os.Getenv("SENDGRID_API_KEY"), "/v3/mail/send", "https://api.sendgrid.com")
  request.Method = "POST"
  request.Body = mail.GetRequestBody(m)
  response, err := sendgrid.API(request)
  if err != nil {
    log.Println(err)
  } else {
    fmt.Println(response.StatusCode)
    fmt.Println(response.Body)
    fmt.Println(response.Headers)
  }
}