add sending emails

iserv/email/main.go

@@ -2,6 +2,7 @@ package email
 
 import (
 	"fmt"
+	"net/smtp"
 
 	"github.com/alexcoder04/iserv2go/iserv/types"
 	"github.com/emersion/go-imap/client"
@@ -10,19 +11,28 @@ import (
 type IServEmailClient struct {
 	config     *types.IServAccountConfig
 	imapClient *client.Client
+	smtpAuth   smtp.Auth
 }
 
 func (c *IServEmailClient) Login(config *types.IServAccountConfig) error {
 	c.config = config
 
-	conn, err := client.DialTLS(fmt.Sprintf("%s:993", c.config.IServHost), nil)
+	// imap client
+	conn1, err := client.DialTLS(fmt.Sprintf("%s:993", c.config.IServHost), nil)
 	if err != nil {
-		fmt.Println("error dial tls")
 		return err
 	}
-	c.imapClient = conn
+	c.imapClient = conn1
 
-	return c.imapClient.Login(c.config.Username, c.config.Password)
+	err = c.imapClient.Login(c.config.Username, c.config.Password)
+	if err != nil {
+		return err
+	}
+
+	// smtp client
+	c.smtpAuth = smtp.PlainAuth("", c.config.Username, c.config.Password, c.config.IServHost)
+
+	return nil
 }
 
 func (c *IServEmailClient) Logout() error {

iserv/email/user.go

@@ -1,6 +1,12 @@
 package email
 
-import "github.com/emersion/go-imap"
+import (
+	"fmt"
+	"net/smtp"
+
+	"github.com/alexcoder04/iserv2go/iserv/types"
+	"github.com/emersion/go-imap"
+)
 
 func (c *IServEmailClient) ListMailboxes() ([]imap.MailboxInfo, error) {
 	mailboxes := make(chan *imap.MailboxInfo, 10)
@@ -52,3 +58,13 @@ func (c *IServEmailClient) ReadMailbox(name string, limit uint32) ([]imap.Messag
 
 	return res, nil
 }
+
+func (c *IServEmailClient) SendMail(mail types.EMail) error {
+	return smtp.SendMail(
+		fmt.Sprintf("%s:587", c.config.IServHost),
+		c.smtpAuth,
+		mail.From,
+		append(mail.CCs, mail.To),
+		buildMailBody(mail),
+	)
+}

iserv/email/utils.go

@@ -0,0 +1,38 @@
+package email
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/alexcoder04/iserv2go/iserv/types"
+)
+
+func getToString(addr string, dispName string, ccs []string) string {
+	var res string
+
+	if dispName == "" {
+		res = fmt.Sprintf("To: %s", addr)
+	} else {
+		res = fmt.Sprintf("To: %s <%s>", dispName, addr)
+	}
+
+	if len(ccs) > 0 {
+		res += fmt.Sprintf("\r\nCc: %s", strings.Join(ccs, ", "))
+	}
+
+	return res
+}
+
+func buildMailBody(mail types.EMail) []byte {
+	return []byte(
+		strings.Join([]string{
+			"MIME-version: 1.0",
+			"Content-Type: text/plain; charset=utf-8",
+			"From: " + mail.From,
+			getToString(mail.To, mail.ToDispName, mail.CCs),
+			"Subject: " + mail.Subject,
+			"\r\n",
+			mail.Body,
+		}, "\r\n"),
+	)
+}

iserv/types/email-types.go

@@ -0,0 +1,10 @@
+package types
+
+type EMail struct {
+	Subject    string
+	From       string
+	To         string
+	ToDispName string
+	CCs        []string
+	Body       string
+}

main.go

@@ -90,6 +90,21 @@ func main() {
 		for _, m := range messages {
 			fmt.Printf(" = '%s' from %s\n", m.Envelope.Subject, m.Envelope.Sender[0].Address())
 		}
+
+		myMail := fmt.Sprintf("%s@%s", os.Getenv("ISERV_USERNAME"), os.Getenv("ISERV_HOST"))
+		m := types.EMail{
+			Subject:    "Hello World",
+			From:       myMail,
+			To:         myMail,
+			ToDispName: "ME",
+			CCs:        []string{},
+			Body:       "Hello World, it's me via iserv2go!",
+		}
+		err = client.Email.SendMail(m)
+		if err != nil {
+			Warn("Cannot send mail: %s", err.Error())
+		}
+		fmt.Println("Sent test message to myself!")
 	}
 
 	// files