/
ses.go
272 lines (230 loc) · 6.84 KB
/
ses.go
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package ses
import (
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"encoding/xml"
"fmt"
"net/http"
"net/url"
"strings"
"time"
"github.com/AdRoll/goamz/aws"
)
const MAX_RECIPIENTS_PER_REQUEST = 50
type SES struct {
Auth aws.Auth
Region aws.Region
}
// Represents the destination of the message, consisting
// of To:, CC:, and BCC: fields.
type Destination struct {
ToAddresses []string
CcAddresses []string
BccAddresses []string
}
// Represents textual data, plus an optional character set specification.
// By default, the text must be 7-bit ASCII, due to the constraints of the
// SMTP protocol. If the text must contain any other characters, then you must
// also specify a character set. Examples include UTF-8, ISO-8859-1, and Shift_JIS.
type Content struct {
Charset string
Data string
}
// Represents the body of the message. You can specify text, HTML,
// or both. If you use both, then the message should display
// correctly in the widest variety of email clients.
type Body struct {
Html *Content
Text *Content
}
// Represents the message to be sent, composed of a subject and a body.
type Message struct {
Subject *Content
Body *Body
}
type SendEmailResult struct {
MessageId string `xml:"MessageId"`
}
type ResponseMetadata struct {
MessageId string `xml:"RequestId"`
}
// Represents a unique message ID returned from a successful SendEmail request.
type SendEmailResponse struct {
XMLName xml.Name `xml:"SendEmailResponse"`
SendEmailResult SendEmailResult `xml:"SendEmailResult"`
ResponseMetadata ResponseMetadata `xml:"ResponseMetadata"`
}
type SendRawEmailResult struct {
MessageId string `xml:"MessageId"`
}
type SendRawEmailResponse struct {
XMLName xml.Name `xml:"SendRawEmailResponse"`
SendRawEmailResult SendRawEmailResult `xml:"SendRawEmailResult"`
ResponseMetadata ResponseMetadata `xml:"ResponseMetadata"`
}
type Error struct {
StatusCode int `xml:"StatusCode"`
Code string `xml:"Code"`
Message string `xml:"Message"`
}
func (err *Error) Error() string {
if err.Code == "" {
return err.Message
}
return fmt.Sprintf("%s (%s)", err.Message, err.Code)
}
func (err *Error) String() string {
return err.Message
}
type ErrorResponse struct {
XMLName xml.Name `xml:"ErrorResponse"`
RequestId string `xml:"RequestId"`
Error Error `xml:"Error"`
}
// Creates a new destination
// TODO: specify address encoding
func NewDestination(toAddresses, ccAddresses, bccAddresses []string) *Destination {
return &Destination{
ToAddresses: toAddresses,
CcAddresses: ccAddresses,
BccAddresses: bccAddresses,
}
}
// Creates a new message with UTF-8 encoding
func NewMessage(subject, textBody, htmlBody string) *Message {
return &Message{
Subject: &Content{
Data: subject,
Charset: "utf-8",
},
Body: &Body{
Text: &Content{
Data: textBody,
Charset: "utf-8",
},
Html: &Content{
Data: htmlBody,
Charset: "utf-8",
},
},
}
}
// Creates a new instance of the SES client
func New(auth aws.Auth, region aws.Region) *SES {
return &SES{
Auth: auth,
Region: region,
}
}
// Composes an email message and sends it.
// See http://docs.aws.amazon.com/ses/latest/APIReference/API_SendEmail.html
func (s *SES) SendEmail(
fromAddress string,
destination *Destination,
message *Message,
) (*SendEmailResponse, error) {
if err := enforceMaxRecipients(destination); err != nil {
return nil, err
}
params := s.makeCommonParams("SendEmail")
params.Add("Source", fromAddress)
for index, addrs := range destination.ToAddresses {
params.Add(fmt.Sprintf("Destination.ToAddresses.member.%d", index+1), addrs)
}
for index, addrs := range destination.CcAddresses {
params.Add(fmt.Sprintf("Destination.CcAddresses.member.%d", index+1), addrs)
}
for index, addrs := range destination.BccAddresses {
params.Add(fmt.Sprintf("Destination.BccAddresses.member.%d", index+1), addrs)
}
params.Add("Message.Subject.Data", message.Subject.Data)
params.Add("Message.Subject.Charset", message.Subject.Charset)
params.Add("Message.Body.Text.Data", message.Body.Text.Data)
params.Add("Message.Body.Text.Charset", message.Body.Text.Charset)
params.Add("Message.Body.Html.Data", message.Body.Html.Data)
params.Add("Message.Body.Html.Charset", message.Body.Html.Charset)
resp := SendEmailResponse{}
if err := s.postSendRequest(params, &resp); err != nil {
return nil, err
}
return &resp, nil
}
// Sends a raw email message as is.
// See http://docs.aws.amazon.com/ses/latest/APIReference/API_SendRawEmail.html
func (s *SES) SendRawEmail(
destinations []string,
rawMessage []byte,
) (*SendRawEmailResponse, error) {
params := s.makeCommonParams("SendRawEmail")
for index, addr := range destinations {
params.Add(fmt.Sprintf("Destinations.member.%d", index+1), addr)
}
params.Add("RawMessage.Data",
base64.StdEncoding.EncodeToString(rawMessage))
resp := SendRawEmailResponse{}
if err := s.postSendRequest(params, &resp); err != nil {
return nil, err
}
return &resp, nil
}
func (s *SES) makeCommonParams(action string) url.Values {
params := make(url.Values)
params.Add("AWSAccessKeyId", s.Auth.AccessKey)
params.Add("Action", action)
return params
}
func (s *SES) postSendRequest(params url.Values, resp interface{}) error {
body := strings.NewReader(params.Encode())
req, err := http.NewRequest("POST", s.Region.SESEndpoint, body)
if err != nil {
return err
}
req.Header = s.composeRequestHeader()
client := &http.Client{}
r, err := client.Do(req)
if err != nil {
return err
}
defer r.Body.Close()
if r.StatusCode != 200 {
return buildError(r)
}
err = xml.NewDecoder(r.Body).Decode(&resp)
if err != nil {
return err
}
return nil
}
// http://docs.aws.amazon.com/ses/latest/APIReference/API_SendEmail.html
func enforceMaxRecipients(d *Destination) error {
addressCount := len(d.ToAddresses) + len(d.CcAddresses) + len(d.BccAddresses)
if addressCount > MAX_RECIPIENTS_PER_REQUEST {
return fmt.Errorf("Too many recipients. Found: %d, max %d", addressCount, MAX_RECIPIENTS_PER_REQUEST)
}
return nil
}
func (s *SES) composeRequestHeader() http.Header {
headers := http.Header{}
now := time.Now().UTC()
date := now.Format("Mon, 02 Jan 2006 15:04:05 -0700")
headers.Set("Date", date)
if s.Auth.Token() != "" {
headers.Set("X-Amz-Security-Token", s.Auth.Token())
}
h := hmac.New(sha256.New, []uint8(s.Auth.SecretKey))
h.Write([]uint8(date))
signature := base64.StdEncoding.EncodeToString(h.Sum(nil))
auth := fmt.Sprintf("AWS3-HTTPS AWSAccessKeyId=%s, Algorithm=HmacSHA256, Signature=%s", s.Auth.AccessKey, signature)
headers.Set("X-Amzn-Authorization", auth)
headers.Set("Content-Type", "application/x-www-form-urlencoded")
return headers
}
func buildError(r *http.Response) error {
errorResponse := ErrorResponse{}
err := xml.NewDecoder(r.Body).Decode(&errorResponse)
if err != nil {
return err
}
return &errorResponse.Error
}