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mailgun.go
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mailgun.go
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package mailgun
import (
"birnenlabs.com/go/lib/conf"
"birnenlabs.com/go/lib/ratelimit"
"encoding/json"
"fmt"
"github.com/golang/glog"
"io/ioutil"
"net/http"
"net/url"
"strings"
"time"
)
const apiUser = "api"
const EventFailed = "failed"
const EventRejected = "rejected"
const EventStored = "stored"
const EventDelivered = "delivered"
type Mailgun struct {
apiKey string
domain string
eu string
client ratelimit.AnyClient
}
func New() (*Mailgun, error) {
var config Config
err := conf.LoadConfigFromJson("mailgun", &config)
if err != nil {
return nil, err
}
eu := ""
if config.Eu {
eu = ".eu"
}
return &Mailgun{
apiKey: config.ApiKey,
domain: config.Domain,
eu: eu,
client: ratelimit.New(&http.Client{}, time.Second),
}, nil
}
func (m *Mailgun) SendEmail(email Email) error {
uri := fmt.Sprintf("https://api%s.mailgun.net/v3/%s/messages", m.eu, m.domain)
glog.Infof("SendEmail url: %v", uri)
payload := createPayload(email)
_, err := m.makePostRequest(uri, payload)
return err
}
// Sends bounce email. Email.From is ignored.
func (m *Mailgun) SendBounceEmail(email Email, failedRecipient string) error {
uri := fmt.Sprintf("https://api%s.mailgun.net/v3/%s/messages", m.eu, m.domain)
glog.Infof("SendBounceEmail url: %v", uri)
if !m.IsInMyDomain(email.To) {
// Send bounces to our domain only.
return fmt.Errorf("Bounces should be sent to own domain only")
}
// Ignore from
email.From = fmt.Sprintf("Mail Delivery Subsystem <mailer-daemon@%s>", m.domain)
payload := createPayload(email)
payload.Add("h:Auto-Submitted", "auto-replied")
payload.Add("h:Return-path", "<>")
payload.Add("h:X-Failed-Recipients", failedRecipient)
_, err := m.makePostRequest(uri, payload)
return err
}
func (m *Mailgun) Forward(storageKey string, to string) error {
email, err := m.getMessage(storageKey)
if err != nil {
return err
}
// Mailgun does not support forwarding in their api, let's fake it with sending from no-reply@ email.
email.Text = fmt.Sprintf("---------- Forwarded message ---------\nFrom: %s\nSubject: %s\nTo: %s\n\n%s", email.From, email.Subject, email.To, email.Text)
// Overwrite To
email.To = to
if !m.IsInMyDomain(email.To) {
// Send forwards to our domain only.
return fmt.Errorf("Forwards should be sent to own domain only")
}
return m.SendEmail(*email)
}
func (m *Mailgun) ListFailedEvents(begin, end int64) ([]Item, error) {
return m.listEvents(begin, end, EventFailed)
}
func (m *Mailgun) ListRejectedEvents(begin, end int64) ([]Item, error) {
return m.listEvents(begin, end, EventRejected)
}
func (m *Mailgun) ListStoredEvents(begin, end int64) ([]Item, error) {
return m.listEvents(begin, end, EventStored)
}
func (m *Mailgun) ListDeliveredEvents(begin, end int64) ([]Item, error) {
return m.listEvents(begin, end, EventDelivered)
}
func (m *Mailgun) ListAllEvents(begin, end int64) ([]Item, error) {
return m.listEvents(begin, end, fmt.Sprintf("%s%%20OR%%20%s%%20OR%%20%s%%20OR%%20%s", EventFailed, EventRejected, EventStored, EventDelivered))
}
func (m *Mailgun) getMessage(storageKey string) (*Email, error) {
uri := fmt.Sprintf("https://storage%s.mailgun.net/v3/domains/%s/messages/%s", m.eu, m.domain, storageKey)
glog.Infof("getMessage url: %v", uri)
body, err := m.makeGetRequest(uri)
if err != nil {
return nil, err
}
var email Email
err = json.Unmarshal(body, &email)
if err != nil {
return nil, err
}
return &email, nil
}
func (m *Mailgun) listEvents(begin, end int64, event string) ([]Item, error) {
result := make([]Item, 0)
nextUrl := fmt.Sprintf("https://api%s.mailgun.net/v3/%s/events?event=%s&begin=%v&end=%v", m.eu, m.domain, event, begin, end)
for nextUrl != "" {
glog.Infof("ListEvents url: %v", nextUrl)
body, err := m.makeGetRequest(nextUrl)
if err != nil {
return nil, err
}
var events EventsResponse
err = json.Unmarshal(body, &events)
if err != nil {
return nil, err
}
result = append(result, events.Items...)
glog.Infof("%v items were returned by the server", len(events.Items))
if len(events.Items) == 0 {
nextUrl = ""
} else {
nextUrl = events.Paging.Next
}
}
return result, nil
}
// TO DELETE
func (m *Mailgun) groupItems(items []Item) map[Headers][]Item {
result := make(map[Headers][]Item)
for _, item := range items {
result[item.Message.Headers] = append(result[item.Message.Headers], item)
}
return result
}
func (m *Mailgun) IsInMyDomain(address string) bool {
return strings.HasSuffix(address, "@"+m.domain)
}
func (m *Mailgun) CreateAddress(user string) string {
return user + "@" + m.domain
}
func (m *Mailgun) MailerDaemon() string {
return fmt.Sprintf("Mail Delivery Subsystem <mailer-daemon@%s>", m.domain)
}
func createPayload(email Email) url.Values {
payload := url.Values{}
payload.Add("from", email.From)
payload.Add("subject", email.Subject)
payload.Add("text", email.Text)
if len(email.To) > 0 {
payload.Add("to", email.To)
}
if len(email.Cc) > 0 {
payload.Add("cc", email.Cc)
}
if len(email.Bcc) > 0 {
payload.Add("bcc", email.Bcc)
}
if len(email.References) > 0 {
payload.Add("h:References", email.References)
}
if len(email.InReplyTo) > 0 {
payload.Add("h:In-Reply-To", email.InReplyTo)
}
return payload
}
func (m *Mailgun) makeGetRequest(uri string) ([]byte, error) {
req, err := http.NewRequest(http.MethodGet, uri, nil)
if err != nil {
return nil, err
}
req.SetBasicAuth(apiUser, m.apiKey)
resp, err := m.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("response code: %v, message: %v", resp.StatusCode, err)
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("response code: %v, message: %v", resp.StatusCode, string(body))
}
return body, nil
}
func (m *Mailgun) makePostRequest(uri string, payload url.Values) ([]byte, error) {
req, err := http.NewRequest(http.MethodPost, uri, strings.NewReader(payload.Encode()))
if err != nil {
return nil, err
}
req.SetBasicAuth(apiUser, m.apiKey)
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
resp, err := m.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("response code: %v, message: %v", resp.StatusCode, err)
}
if resp.StatusCode != 200 {
return nil, fmt.Errorf("response code: %v, message: %v", resp.StatusCode, string(body))
}
return body, nil
}