Fix email encoding

cmd/trello2mail/email.go

@@ -1,21 +1,35 @@
 package main
 
+// TODO: use https://github.com/domodwyer/mailyak as a base lib
+
 import (
 	"bytes"
+	"encoding/base64"
 	"fmt"
-	"github.com/davecgh/go-spew/spew"
+	// "github.com/davecgh/go-spew/spew"
 	"strings"
 	// "log"
 	// "strconv"
+	"math/rand"
 	"net/mail"
 )
 
 type EmailHeaders map[string]string
-type EmailBody string
 
 type EmailCtx struct {
-	Headers EmailHeaders
-	Body    EmailBody
+	Headers   EmailHeaders
+	BodyPlain string
+	BodyHtml  string
+}
+
+const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+func RandStringBytes(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+	}
+	return string(b)
 }
 
 func (headers EmailHeaders) String() string {
@@ -26,14 +40,6 @@ func (headers EmailHeaders) String() string {
 	return buffer.String()
 }
 
-func (body EmailBody) String() string {
-	res := string(body)
-	if false {
-		spew.Dump(res)
-	}
-	return res
-}
-
 func NewEmail() *EmailCtx {
 	email := EmailCtx{}
 	email.Headers = make(EmailHeaders)
@@ -46,23 +52,57 @@ func encodeRFC2047(text string) string {
 	return strings.Trim(addr.String(), " \"<@>")
 }
 
-func (email *EmailCtx) MakeHeaders(config EmailConfig) {
+func (email *EmailCtx) SetHeaders(config EmailConfig) {
 	email.Headers["Return-Path"] = config.From
 	email.Headers["From"] = config.From
 	email.Headers["To"] = config.To
 	email.Headers["Subject"] = encodeRFC2047(config.Subject)
-	// email.Headers["Content-Type"] = "text/plain; charset=\"us-ascii\";"
-	email.Headers["Content-Type"] = "text/plain; charset=\"utf-8\";"
-	email.Headers["Content-Transfer-Encoding"] = "base64"
+	email.Headers["Content-Transfer-Encoding"] = "quoted-printable"
 	email.Headers["MIME-Version"] = "1.0"
 
 	return
 }
 
-func (email *EmailCtx) MakeBody(content string) {
-	email.Body = EmailBody(content)
-	if false {
-		spew.Dump(email.Body)
-	}
+func (email *EmailCtx) SetBody(html string, plain string) {
+	email.BodyPlain = plain
+	email.BodyHtml = html
 	return
 }
+
+func (email *EmailCtx) String() string {
+	var buffer bytes.Buffer
+	mixBoundary := RandStringBytes(16)
+	altBoundary := RandStringBytes(16)
+
+	buffer.WriteString(email.Headers.String())
+	buffer.WriteString(fmt.Sprintf("Content-Type: multipart/mixed;\r\n    boundary=\"%s\"\r\n", mixBoundary))
+	buffer.WriteString("\r\n")
+
+	buffer.WriteString(fmt.Sprintf("--%s\r\n", mixBoundary))
+	buffer.WriteString(fmt.Sprintf("Content-Type: multipart/alternative;\r\n    boundary=\"%s\"\r\n", altBoundary))
+	buffer.WriteString("\r\n")
+
+	buffer.WriteString(fmt.Sprintf("--%s\r\n", altBoundary))
+	buffer.WriteString(fmt.Sprintf("Content-Type: text/plain; charset=\"utf-8\"\r\n"))
+	buffer.WriteString(fmt.Sprintf("Content-Transfer-Encoding: base64\r\n"))
+	buffer.WriteString("\r\n")
+	buffer.WriteString(base64.StdEncoding.EncodeToString([]byte(email.BodyPlain)))
+	buffer.WriteString("\r\n")
+	buffer.WriteString("\r\n")
+
+	buffer.WriteString(fmt.Sprintf("--%s\r\n", altBoundary))
+	buffer.WriteString(fmt.Sprintf("Content-Type: text/html; charset=\"utf-8\"\r\n"))
+	buffer.WriteString(fmt.Sprintf("Content-Transfer-Encoding: base64\r\n"))
+	buffer.WriteString("\r\n")
+	buffer.WriteString(base64.StdEncoding.EncodeToString([]byte(email.BodyHtml)))
+	buffer.WriteString("\r\n")
+	buffer.WriteString("\r\n")
+
+	buffer.WriteString(fmt.Sprintf("--%s--\r\n", altBoundary))
+	buffer.WriteString("\r\n")
+
+	buffer.WriteString(fmt.Sprintf("--%s--\r\n", mixBoundary))
+	buffer.WriteString("\r\n")
+
+	return buffer.String()
+}

cmd/trello2mail/main.go

@@ -1,8 +1,9 @@
 package main
 
 import (
-// "gopkg.in/russross/blackfriday.v2"
-// "github.com/davecgh/go-spew/spew"
+	"fmt"
+	// "gopkg.in/russross/blackfriday.v2"
+	// "github.com/davecgh/go-spew/spew"
 )
 
 func main() {
@@ -14,11 +15,13 @@ func main() {
 	trelloCtx := NewTrello(config.Trello.Token)
 	trelloBoard := trelloCtx.GetBoard(config.Trello.Url)
 	trelloMarkdown := trelloBoard.ExportToMarkdown()
+	trelloHtml := trelloBoard.ExportToHtml()
+	config.Email.Subject = fmt.Sprintf("Daily mail for %s", trelloBoard.Name)
 
 	// Create email enveloppe
 	email := NewEmail()
-	email.MakeHeaders(config.Email)
-	email.MakeBody(trelloMarkdown)
+	email.SetHeaders(config.Email)
+	email.SetBody(trelloHtml, trelloMarkdown)
 
 	// Connect and send email
 	transport := NewTransport(config.Smtp)

cmd/trello2mail/transport.go

@@ -3,7 +3,6 @@ package main
 import (
 	"bytes"
 	"crypto/tls"
-	"encoding/base64"
 	"fmt"
 	"log"
 	"net/smtp"
@@ -122,11 +121,7 @@ func (ctx *TransportCtx) Send(email *EmailCtx) {
 	}
 	defer wc.Close()
 
-	var buffer bytes.Buffer
-	buffer.WriteString(email.Headers.String())
-	buffer.WriteString("\r\n")
-	buffer.WriteString(base64.StdEncoding.EncodeToString([]byte(email.Body.String())))
-
+	buffer := bytes.NewBufferString(email.String())
 	if _, err = buffer.WriteTo(wc); err != nil {
 		log.Panic(err)
 	}

cmd/trello2mail/trello.go

@@ -4,8 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"github.com/adlio/trello"
-	// "github.com/davecgh/go-spew/spew"
-
 	"gopkg.in/russross/blackfriday.v2"
 	"log"
 	"net/url"
@@ -24,8 +22,9 @@ type TrelloCtx struct {
 }
 
 type TrelloBoard struct {
-	Ctx *TrelloCtx
-	Ptr *trello.Board
+	Ctx  *TrelloCtx
+	Ptr  *trello.Board
+	Name string
 }
 
 func runcmd(command string) string {
@@ -75,10 +74,8 @@ func (ctx *TrelloCtx) GetBoard(boardUrl string) TrelloBoard {
 	}
 	boardId := strings.Split(parsedUrl.Path, "/")[2]
 
-	// spew.Dump(boardId)
 	board, err := ctx.Client.GetBoard(boardId, trello.Defaults())
-	// spew.Dump(board)
-	return TrelloBoard{Ctx: ctx, Ptr: board}
+	return TrelloBoard{Ctx: ctx, Ptr: board, Name: board.Name}
 }
 
 func (board *TrelloBoard) ExportToMarkdown() string {
@@ -108,7 +105,6 @@ func (board *TrelloBoard) ExportToMarkdown() string {
 		for _, card := range cards {
 			text := fmt.Sprintf("* %s\n", card.Name)
 			markdown.WriteString(text)
-			// spew.Dump(card)
 		}
 	}
 	return markdown.String()