Move file backend to its own service (#9435)

* Move file backend to its own service

* Moving utils/inbucket to mailservice package

3 files changed, 789 insertions, 0 deletions

diff --git a/services/mailservice/inbucket.go b/services/mailservice/inbucket.go
new file mode 100644
index 000000000..28922d660
--- /dev/null
+++ b/services/mailservice/inbucket.go
@@ -0,0 +1,200 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package mailservice
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+const (
+	INBUCKET_API = "/api/v1/mailbox/"
+)
+
+// OutputJSONHeader holds the received Header to test sending emails (inbucket)
+type JSONMessageHeaderInbucket []struct {
+	Mailbox             string
+	ID                  string `json:"Id"`
+	From, Subject, Date string
+	To                  []string
+	Size                int
+}
+
+// OutputJSONMessage holds the received Message fto test sending emails (inbucket)
+type JSONMessageInbucket struct {
+	Mailbox             string
+	ID                  string `json:"Id"`
+	From, Subject, Date string
+	Size                int
+	Header              map[string][]string
+	Body                struct {
+		Text string
+		HTML string `json:"Html"`
+	}
+	Attachments []struct {
+		Filename     string
+		ContentType  string `json:"content-type"`
+		DownloadLink string `json:"download-link"`
+		Bytes        []byte `json:"-"`
+	}
+}
+
+func ParseEmail(email string) string {
+	pos := strings.Index(email, "@")
+	parsedEmail := email[0:pos]
+	return parsedEmail
+}
+
+func GetMailBox(email string) (results JSONMessageHeaderInbucket, err error) {
+
+	parsedEmail := ParseEmail(email)
+
+	url := fmt.Sprintf("%s%s%s", getInbucketHost(), INBUCKET_API, parsedEmail)
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	client := &http.Client{}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.Body == nil {
+		return nil, fmt.Errorf("No Mailbox")
+	}
+
+	var record JSONMessageHeaderInbucket
+	err = json.NewDecoder(resp.Body).Decode(&record)
+	switch {
+	case err == io.EOF:
+		return nil, fmt.Errorf("Error: %s", err)
+	case err != nil:
+		return nil, fmt.Errorf("Error: %s", err)
+	}
+	if len(record) == 0 {
+		return nil, fmt.Errorf("No mailbox")
+	}
+
+	return record, nil
+}
+
+func GetMessageFromMailbox(email, id string) (results JSONMessageInbucket, err error) {
+
+	parsedEmail := ParseEmail(email)
+
+	var record JSONMessageInbucket
+
+	url := fmt.Sprintf("%s%s%s/%s", getInbucketHost(), INBUCKET_API, parsedEmail, id)
+	emailResponse, err := get(url)
+	if err != nil {
+		return record, err
+	}
+	defer emailResponse.Body.Close()
+
+	err = json.NewDecoder(emailResponse.Body).Decode(&record)
+
+	// download attachments
+	if record.Attachments != nil && len(record.Attachments) > 0 {
+		for i := range record.Attachments {
+			if bytes, err := downloadAttachment(record.Attachments[i].DownloadLink); err != nil {
+				return record, err
+			} else {
+				record.Attachments[i].Bytes = make([]byte, len(bytes))
+				copy(record.Attachments[i].Bytes, bytes)
+			}
+		}
+	}
+
+	return record, err
+}
+
+func downloadAttachment(url string) ([]byte, error) {
+	attachmentResponse, err := get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer attachmentResponse.Body.Close()
+
+	buf := new(bytes.Buffer)
+	io.Copy(buf, attachmentResponse.Body)
+	return buf.Bytes(), nil
+}
+
+func get(url string) (*http.Response, error) {
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	return resp, nil
+}
+
+func DeleteMailBox(email string) (err error) {
+
+	parsedEmail := ParseEmail(email)
+
+	url := fmt.Sprintf("%s%s%s", getInbucketHost(), INBUCKET_API, parsedEmail)
+	req, err := http.NewRequest("DELETE", url, nil)
+	if err != nil {
+		return err
+	}
+
+	client := &http.Client{}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	return nil
+}
+
+func RetryInbucket(attempts int, callback func() error) (err error) {
+	for i := 0; ; i++ {
+		err = callback()
+		if err == nil {
+			return nil
+		}
+
+		if i >= (attempts - 1) {
+			break
+		}
+
+		time.Sleep(5 * time.Second)
+
+		fmt.Println("retrying...")
+	}
+	return fmt.Errorf("After %d attempts, last error: %s", attempts, err)
+}
+
+func getInbucketHost() (host string) {
+
+	inbucket_host := os.Getenv("CI_HOST")
+	if inbucket_host == "" {
+		inbucket_host = "dockerhost"
+	}
+
+	inbucket_port := os.Getenv("CI_INBUCKET_PORT")
+	if inbucket_port == "" {
+		inbucket_port = "9000"
+	}
+	return fmt.Sprintf("http://%s:%s", inbucket_host, inbucket_port)
+}
diff --git a/services/mailservice/mail.go b/services/mailservice/mail.go
new file mode 100644
index 000000000..e9b689f20
--- /dev/null
+++ b/services/mailservice/mail.go
@@ -0,0 +1,299 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package mailservice
+
+import (
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"io"
+	"mime"
+	"net"
+	"net/mail"
+	"net/smtp"
+	"time"
+
+	"gopkg.in/gomail.v2"
+
+	"net/http"
+
+	"github.com/jaytaylor/html2text"
+	"github.com/mattermost/mattermost-server/mlog"
+	"github.com/mattermost/mattermost-server/model"
+	"github.com/mattermost/mattermost-server/services/filesstore"
+	"github.com/mattermost/mattermost-server/utils"
+)
+
+func encodeRFC2047Word(s string) string {
+	return mime.BEncoding.Encode("utf-8", s)
+}
+
+type SmtpConnectionInfo struct {
+	SmtpUsername         string
+	SmtpPassword         string
+	SmtpServerName       string
+	SmtpServerHost       string
+	SmtpPort             string
+	SkipCertVerification bool
+	ConnectionSecurity   string
+	Auth                 bool
+}
+
+type authChooser struct {
+	smtp.Auth
+	connectionInfo *SmtpConnectionInfo
+}
+
+func (a *authChooser) Start(server *smtp.ServerInfo) (string, []byte, error) {
+	smtpAddress := a.connectionInfo.SmtpServerName + ":" + a.connectionInfo.SmtpPort
+	a.Auth = LoginAuth(a.connectionInfo.SmtpUsername, a.connectionInfo.SmtpPassword, smtpAddress)
+	for _, method := range server.Auth {
+		if method == "PLAIN" {
+			a.Auth = smtp.PlainAuth("", a.connectionInfo.SmtpUsername, a.connectionInfo.SmtpPassword, a.connectionInfo.SmtpServerName+":"+a.connectionInfo.SmtpPort)
+			break
+		}
+	}
+	return a.Auth.Start(server)
+}
+
+type loginAuth struct {
+	username, password, host string
+}
+
+func LoginAuth(username, password, host string) smtp.Auth {
+	return &loginAuth{username, password, host}
+}
+
+func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
+	if !server.TLS {
+		return "", nil, errors.New("unencrypted connection")
+	}
+
+	if server.Name != a.host {
+		return "", nil, errors.New("wrong host name")
+	}
+
+	return "LOGIN", []byte{}, nil
+}
+
+func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
+	if more {
+		switch string(fromServer) {
+		case "Username:":
+			return []byte(a.username), nil
+		case "Password:":
+			return []byte(a.password), nil
+		default:
+			return nil, errors.New("Unknown fromServer")
+		}
+	}
+	return nil, nil
+}
+
+func ConnectToSMTPServerAdvanced(connectionInfo *SmtpConnectionInfo) (net.Conn, *model.AppError) {
+	var conn net.Conn
+	var err error
+
+	smtpAddress := connectionInfo.SmtpServerHost + ":" + connectionInfo.SmtpPort
+	if connectionInfo.ConnectionSecurity == model.CONN_SECURITY_TLS {
+		tlsconfig := &tls.Config{
+			InsecureSkipVerify: connectionInfo.SkipCertVerification,
+			ServerName:         connectionInfo.SmtpServerName,
+		}
+
+		conn, err = tls.Dial("tcp", smtpAddress, tlsconfig)
+		if err != nil {
+			return nil, model.NewAppError("SendMail", "utils.mail.connect_smtp.open_tls.app_error", nil, err.Error(), http.StatusInternalServerError)
+		}
+	} else {
+		conn, err = net.Dial("tcp", smtpAddress)
+		if err != nil {
+			return nil, model.NewAppError("SendMail", "utils.mail.connect_smtp.open.app_error", nil, err.Error(), http.StatusInternalServerError)
+		}
+	}
+
+	return conn, nil
+}
+
+func ConnectToSMTPServer(config *model.Config) (net.Conn, *model.AppError) {
+	return ConnectToSMTPServerAdvanced(
+		&SmtpConnectionInfo{
+			ConnectionSecurity:   config.EmailSettings.ConnectionSecurity,
+			SkipCertVerification: *config.EmailSettings.SkipServerCertificateVerification,
+			SmtpServerName:       config.EmailSettings.SMTPServer,
+			SmtpServerHost:       config.EmailSettings.SMTPServer,
+			SmtpPort:             config.EmailSettings.SMTPPort,
+		},
+	)
+}
+
+func NewSMTPClientAdvanced(conn net.Conn, hostname string, connectionInfo *SmtpConnectionInfo) (*smtp.Client, *model.AppError) {
+	c, err := smtp.NewClient(conn, connectionInfo.SmtpServerName+":"+connectionInfo.SmtpPort)
+	if err != nil {
+		mlog.Error(fmt.Sprintf("Failed to open a connection to SMTP server %v", err))
+		return nil, model.NewAppError("SendMail", "utils.mail.connect_smtp.open_tls.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	if hostname != "" {
+		err := c.Hello(hostname)
+		if err != nil {
+			mlog.Error(fmt.Sprintf("Failed to to set the HELO to SMTP server %v", err))
+			return nil, model.NewAppError("SendMail", "utils.mail.connect_smtp.helo.app_error", nil, err.Error(), http.StatusInternalServerError)
+		}
+	}
+
+	if connectionInfo.ConnectionSecurity == model.CONN_SECURITY_STARTTLS {
+		tlsconfig := &tls.Config{
+			InsecureSkipVerify: connectionInfo.SkipCertVerification,
+			ServerName:         connectionInfo.SmtpServerName,
+		}
+		c.StartTLS(tlsconfig)
+	}
+
+	if connectionInfo.Auth {
+		if err = c.Auth(&authChooser{connectionInfo: connectionInfo}); err != nil {
+			return nil, model.NewAppError("SendMail", "utils.mail.new_client.auth.app_error", nil, err.Error(), http.StatusInternalServerError)
+		}
+	}
+	return c, nil
+}
+
+func NewSMTPClient(conn net.Conn, config *model.Config) (*smtp.Client, *model.AppError) {
+	return NewSMTPClientAdvanced(
+		conn,
+		utils.GetHostnameFromSiteURL(*config.ServiceSettings.SiteURL),
+		&SmtpConnectionInfo{
+			ConnectionSecurity:   config.EmailSettings.ConnectionSecurity,
+			SkipCertVerification: *config.EmailSettings.SkipServerCertificateVerification,
+			SmtpServerName:       config.EmailSettings.SMTPServer,
+			SmtpServerHost:       config.EmailSettings.SMTPServer,
+			SmtpPort:             config.EmailSettings.SMTPPort,
+			Auth:                 *config.EmailSettings.EnableSMTPAuth,
+			SmtpUsername:         config.EmailSettings.SMTPUsername,
+			SmtpPassword:         config.EmailSettings.SMTPPassword,
+		},
+	)
+}
+
+func TestConnection(config *model.Config) {
+	if !config.EmailSettings.SendEmailNotifications {
+		return
+	}
+
+	conn, err1 := ConnectToSMTPServer(config)
+	if err1 != nil {
+		mlog.Error(fmt.Sprintf("SMTP server settings do not appear to be configured properly err=%v details=%v", utils.T(err1.Message), err1.DetailedError))
+		return
+	}
+	defer conn.Close()
+
+	c, err2 := NewSMTPClient(conn, config)
+	if err2 != nil {
+		mlog.Error(fmt.Sprintf("SMTP server settings do not appear to be configured properly err=%v details=%v", utils.T(err2.Message), err2.DetailedError))
+		return
+	}
+	defer c.Quit()
+	defer c.Close()
+}
+
+func SendMailUsingConfig(to, subject, htmlBody string, config *model.Config, enableComplianceFeatures bool) *model.AppError {
+	fromMail := mail.Address{Name: config.EmailSettings.FeedbackName, Address: config.EmailSettings.FeedbackEmail}
+
+	return SendMailUsingConfigAdvanced(to, to, fromMail, subject, htmlBody, nil, nil, config, enableComplianceFeatures)
+}
+
+// allows for sending an email with attachments and differing MIME/SMTP recipients
+func SendMailUsingConfigAdvanced(mimeTo, smtpTo string, from mail.Address, subject, htmlBody string, attachments []*model.FileInfo, mimeHeaders map[string]string, config *model.Config, enableComplianceFeatures bool) *model.AppError {
+	if !config.EmailSettings.SendEmailNotifications || len(config.EmailSettings.SMTPServer) == 0 {
+		return nil
+	}
+
+	conn, err := ConnectToSMTPServer(config)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	c, err := NewSMTPClient(conn, config)
+	if err != nil {
+		return err
+	}
+	defer c.Quit()
+	defer c.Close()
+
+	fileBackend, err := filesstore.NewFileBackend(&config.FileSettings, enableComplianceFeatures)
+	if err != nil {
+		return err
+	}
+
+	return SendMail(c, mimeTo, smtpTo, from, subject, htmlBody, attachments, mimeHeaders, fileBackend, time.Now())
+}
+
+func SendMail(c *smtp.Client, mimeTo, smtpTo string, from mail.Address, subject, htmlBody string, attachments []*model.FileInfo, mimeHeaders map[string]string, fileBackend filesstore.FileBackend, date time.Time) *model.AppError {
+	mlog.Debug(fmt.Sprintf("sending mail to %v with subject of '%v'", smtpTo, subject))
+
+	htmlMessage := "\r\n<html><body>" + htmlBody + "</body></html>"
+
+	txtBody, err := html2text.FromString(htmlBody)
+	if err != nil {
+		mlog.Warn(fmt.Sprint(err))
+		txtBody = ""
+	}
+
+	headers := map[string][]string{
+		"From":                      {from.String()},
+		"To":                        {mimeTo},
+		"Subject":                   {encodeRFC2047Word(subject)},
+		"Content-Transfer-Encoding": {"8bit"},
+		"Auto-Submitted":            {"auto-generated"},
+		"Precedence":                {"bulk"},
+	}
+	for k, v := range mimeHeaders {
+		headers[k] = []string{encodeRFC2047Word(v)}
+	}
+
+	m := gomail.NewMessage(gomail.SetCharset("UTF-8"))
+	m.SetHeaders(headers)
+	m.SetDateHeader("Date", date)
+	m.SetBody("text/plain", txtBody)
+	m.AddAlternative("text/html", htmlMessage)
+
+	for _, fileInfo := range attachments {
+		bytes, err := fileBackend.ReadFile(fileInfo.Path)
+		if err != nil {
+			return err
+		}
+
+		m.Attach(fileInfo.Name, gomail.SetCopyFunc(func(writer io.Writer) error {
+			if _, err := writer.Write(bytes); err != nil {
+				return model.NewAppError("SendMail", "utils.mail.sendMail.attachments.write_error", nil, err.Error(), http.StatusInternalServerError)
+			}
+			return nil
+		}))
+	}
+
+	if err := c.Mail(from.Address); err != nil {
+		return model.NewAppError("SendMail", "utils.mail.send_mail.from_address.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	if err := c.Rcpt(smtpTo); err != nil {
+		return model.NewAppError("SendMail", "utils.mail.send_mail.to_address.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	w, err := c.Data()
+	if err != nil {
+		return model.NewAppError("SendMail", "utils.mail.send_mail.msg_data.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	_, err = m.WriteTo(w)
+	if err != nil {
+		return model.NewAppError("SendMail", "utils.mail.send_mail.msg.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	err = w.Close()
+	if err != nil {
+		return model.NewAppError("SendMail", "utils.mail.send_mail.close.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	return nil
+}
diff --git a/services/mailservice/mail_test.go b/services/mailservice/mail_test.go
new file mode 100644
index 000000000..9ad48c703
--- /dev/null
+++ b/services/mailservice/mail_test.go
@@ -0,0 +1,290 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package mailservice
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+	"testing"
+
+	"net/mail"
+	"net/smtp"
+
+	"github.com/mattermost/mattermost-server/model"
+	"github.com/mattermost/mattermost-server/services/filesstore"
+	"github.com/mattermost/mattermost-server/utils"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMailConnectionFromConfig(t *testing.T) {
+	cfg, _, _, err := utils.LoadConfig("config.json")
+	require.Nil(t, err)
+
+	if conn, err := ConnectToSMTPServer(cfg); err != nil {
+		t.Log(err)
+		t.Fatal("Should connect to the STMP Server")
+	} else {
+		if _, err1 := NewSMTPClient(conn, cfg); err1 != nil {
+			t.Log(err)
+			t.Fatal("Should get new smtp client")
+		}
+	}
+
+	cfg.EmailSettings.SMTPServer = "wrongServer"
+	cfg.EmailSettings.SMTPPort = "553"
+
+	if _, err := ConnectToSMTPServer(cfg); err == nil {
+		t.Log(err)
+		t.Fatal("Should not to the STMP Server")
+	}
+}
+
+func TestMailConnectionAdvanced(t *testing.T) {
+	cfg, _, _, err := utils.LoadConfig("config.json")
+	require.Nil(t, err)
+
+	if conn, err := ConnectToSMTPServerAdvanced(
+		&SmtpConnectionInfo{
+			ConnectionSecurity:   cfg.EmailSettings.ConnectionSecurity,
+			SkipCertVerification: *cfg.EmailSettings.SkipServerCertificateVerification,
+			SmtpServerName:       cfg.EmailSettings.SMTPServer,
+			SmtpServerHost:       cfg.EmailSettings.SMTPServer,
+			SmtpPort:             cfg.EmailSettings.SMTPPort,
+		},
+	); err != nil {
+		t.Log(err)
+		t.Fatal("Should connect to the STMP Server")
+	} else {
+		if _, err1 := NewSMTPClientAdvanced(
+			conn,
+			utils.GetHostnameFromSiteURL(*cfg.ServiceSettings.SiteURL),
+			&SmtpConnectionInfo{
+				ConnectionSecurity:   cfg.EmailSettings.ConnectionSecurity,
+				SkipCertVerification: *cfg.EmailSettings.SkipServerCertificateVerification,
+				SmtpServerName:       cfg.EmailSettings.SMTPServer,
+				SmtpServerHost:       cfg.EmailSettings.SMTPServer,
+				SmtpPort:             cfg.EmailSettings.SMTPPort,
+				Auth:                 *cfg.EmailSettings.EnableSMTPAuth,
+				SmtpUsername:         cfg.EmailSettings.SMTPUsername,
+				SmtpPassword:         cfg.EmailSettings.SMTPPassword,
+			},
+		); err1 != nil {
+			t.Log(err)
+			t.Fatal("Should get new smtp client")
+		}
+	}
+
+	if _, err := ConnectToSMTPServerAdvanced(
+		&SmtpConnectionInfo{
+			ConnectionSecurity:   cfg.EmailSettings.ConnectionSecurity,
+			SkipCertVerification: *cfg.EmailSettings.SkipServerCertificateVerification,
+			SmtpServerName:       "wrongServer",
+			SmtpServerHost:       "wrongServer",
+			SmtpPort:             "553",
+		},
+	); err == nil {
+		t.Log(err)
+		t.Fatal("Should not to the STMP Server")
+	}
+
+}
+
+func TestSendMailUsingConfig(t *testing.T) {
+	cfg, _, _, err := utils.LoadConfig("config.json")
+	require.Nil(t, err)
+	utils.T = utils.GetUserTranslations("en")
+
+	var emailTo = "test@example.com"
+	var emailSubject = "Testing this email"
+	var emailBody = "This is a test from autobot"
+
+	//Delete all the messages before check the sample email
+	DeleteMailBox(emailTo)
+
+	if err := SendMailUsingConfig(emailTo, emailSubject, emailBody, cfg, true); err != nil {
+		t.Log(err)
+		t.Fatal("Should connect to the STMP Server")
+	} else {
+		//Check if the email was send to the right email address
+		var resultsMailbox JSONMessageHeaderInbucket
+		err := RetryInbucket(5, func() error {
+			var err error
+			resultsMailbox, err = GetMailBox(emailTo)
+			return err
+		})
+		if err != nil {
+			t.Log(err)
+			t.Log("No email was received, maybe due load on the server. Disabling this verification")
+		}
+		if err == nil && len(resultsMailbox) > 0 {
+			if !strings.ContainsAny(resultsMailbox[0].To[0], emailTo) {
+				t.Fatal("Wrong To recipient")
+			} else {
+				if resultsEmail, err := GetMessageFromMailbox(emailTo, resultsMailbox[0].ID); err == nil {
+					if !strings.Contains(resultsEmail.Body.Text, emailBody) {
+						t.Log(resultsEmail.Body.Text)
+						t.Fatal("Received message")
+					}
+				}
+			}
+		}
+	}
+}
+
+func TestSendMailUsingConfigAdvanced(t *testing.T) {
+	cfg, _, _, err := utils.LoadConfig("config.json")
+	require.Nil(t, err)
+	utils.T = utils.GetUserTranslations("en")
+
+	var mimeTo = "test@example.com"
+	var smtpTo = "test2@example.com"
+	var from = mail.Address{Name: "Nobody", Address: "nobody@mattermost.com"}
+	var emailSubject = "Testing this email"
+	var emailBody = "This is a test from autobot"
+
+	//Delete all the messages before check the sample email
+	DeleteMailBox(smtpTo)
+
+	fileBackend, err := filesstore.NewFileBackend(&cfg.FileSettings, true)
+	assert.Nil(t, err)
+
+	// create two files with the same name that will both be attached to the email
+	fileName := "file.txt"
+	filePath1 := fmt.Sprintf("test1/%s", fileName)
+	filePath2 := fmt.Sprintf("test2/%s", fileName)
+	fileContents1 := []byte("hello world")
+	fileContents2 := []byte("foo bar")
+	_, err = fileBackend.WriteFile(bytes.NewReader(fileContents1), filePath1)
+	assert.Nil(t, err)
+	_, err = fileBackend.WriteFile(bytes.NewReader(fileContents2), filePath2)
+	assert.Nil(t, err)
+	defer fileBackend.RemoveFile(filePath1)
+	defer fileBackend.RemoveFile(filePath2)
+
+	attachments := make([]*model.FileInfo, 2)
+	attachments[0] = &model.FileInfo{
+		Name: fileName,
+		Path: filePath1,
+	}
+	attachments[1] = &model.FileInfo{
+		Name: fileName,
+		Path: filePath2,
+	}
+
+	headers := make(map[string]string)
+	headers["TestHeader"] = "TestValue"
+
+	if err := SendMailUsingConfigAdvanced(mimeTo, smtpTo, from, emailSubject, emailBody, attachments, headers, cfg, true); err != nil {
+		t.Log(err)
+		t.Fatal("Should connect to the STMP Server")
+	} else {
+		//Check if the email was send to the right email address
+		var resultsMailbox JSONMessageHeaderInbucket
+		err := RetryInbucket(5, func() error {
+			var err error
+			resultsMailbox, err = GetMailBox(smtpTo)
+			return err
+		})
+		if err != nil {
+			t.Log(err)
+			t.Fatal("No emails found for address " + smtpTo)
+		}
+		if err == nil && len(resultsMailbox) > 0 {
+			if !strings.ContainsAny(resultsMailbox[0].To[0], smtpTo) {
+				t.Fatal("Wrong To recipient")
+			} else {
+				if resultsEmail, err := GetMessageFromMailbox(smtpTo, resultsMailbox[0].ID); err == nil {
+					if !strings.Contains(resultsEmail.Body.Text, emailBody) {
+						t.Log(resultsEmail.Body.Text)
+						t.Fatal("Received message")
+					}
+
+					// verify that the To header of the email message is set to the MIME recipient, even though we got it out of the SMTP recipient's email inbox
+					assert.Equal(t, mimeTo, resultsEmail.Header["To"][0])
+
+					// verify that the MIME from address is correct - unfortunately, we can't verify the SMTP from address
+					assert.Equal(t, from.String(), resultsEmail.Header["From"][0])
+
+					// check that the custom mime headers came through - header case seems to get mutated
+					assert.Equal(t, "TestValue", resultsEmail.Header["Testheader"][0])
+
+					// ensure that the attachments were successfully sent
+					assert.Len(t, resultsEmail.Attachments, 2)
+					assert.Equal(t, fileName, resultsEmail.Attachments[0].Filename)
+					assert.Equal(t, fileName, resultsEmail.Attachments[1].Filename)
+					attachment1 := string(resultsEmail.Attachments[0].Bytes)
+					attachment2 := string(resultsEmail.Attachments[1].Bytes)
+					if attachment1 == string(fileContents1) {
+						assert.Equal(t, attachment2, string(fileContents2))
+					} else if attachment1 == string(fileContents2) {
+						assert.Equal(t, attachment2, string(fileContents1))
+					} else {
+						assert.Fail(t, "Unrecognized attachment contents")
+					}
+				}
+			}
+		}
+	}
+}
+
+func TestAuthMethods(t *testing.T) {
+	auth := &authChooser{
+		connectionInfo: &SmtpConnectionInfo{
+			SmtpUsername:   "test",
+			SmtpPassword:   "fakepass",
+			SmtpServerName: "fakeserver",
+			SmtpServerHost: "fakeserver",
+			SmtpPort:       "25",
+		},
+	}
+	tests := []struct {
+		desc   string
+		server *smtp.ServerInfo
+		err    string
+	}{
+		{
+			desc:   "auth PLAIN success",
+			server: &smtp.ServerInfo{Name: "fakeserver:25", Auth: []string{"PLAIN"}, TLS: true},
+		},
+		{
+			desc:   "auth PLAIN unencrypted connection fail",
+			server: &smtp.ServerInfo{Name: "fakeserver:25", Auth: []string{"PLAIN"}, TLS: false},
+			err:    "unencrypted connection",
+		},
+		{
+			desc:   "auth PLAIN wrong host name",
+			server: &smtp.ServerInfo{Name: "wrongServer:999", Auth: []string{"PLAIN"}, TLS: true},
+			err:    "wrong host name",
+		},
+		{
+			desc:   "auth LOGIN success",
+			server: &smtp.ServerInfo{Name: "fakeserver:25", Auth: []string{"LOGIN"}, TLS: true},
+		},
+		{
+			desc:   "auth LOGIN unencrypted connection fail",
+			server: &smtp.ServerInfo{Name: "wrongServer:999", Auth: []string{"LOGIN"}, TLS: true},
+			err:    "wrong host name",
+		},
+		{
+			desc:   "auth LOGIN wrong host name",
+			server: &smtp.ServerInfo{Name: "fakeserver:25", Auth: []string{"LOGIN"}, TLS: false},
+			err:    "unencrypted connection",
+		},
+	}
+
+	for i, test := range tests {
+		t.Run(test.desc, func(t *testing.T) {
+			_, _, err := auth.Start(test.server)
+			got := ""
+			if err != nil {
+				got = err.Error()
+			}
+			if got != test.err {
+				t.Errorf("%d. got error = %q; want %q", i, got, test.err)
+			}
+		})
+	}
+}