fix: update content type and encoding for xlsx attachment

email.go

@@ -2,6 +2,8 @@ package timetracker
 
 import (
 	"bytes"
+	"encoding/base64"
+	"errors"
 	"fmt"
 	"mime/multipart"
 	"net/textproto"
@@ -51,6 +53,10 @@ func (publisher *EMailPublisher) Send(content []byte, fileName string) error {
 // RawEMail generates a raw email with given sender/receiver, subject, message and attachment.
 func rawEMail(source, destination, subject, message string, csvFile []byte, attachmentFilename string) (*string, error) {
 
+	if !strings.HasSuffix(attachmentFilename, "xlsx") {
+		return nil, errors.New("Excel (xlsx) supported only atm!")
+	}
+
 	buf := new(bytes.Buffer)
 	writer := multipart.NewWriter(buf)
 
@@ -82,16 +88,23 @@ func rawEMail(source, destination, subject, message string, csvFile []byte, atta
 	fn := attachmentFilename
 	h = make(textproto.MIMEHeader)
 	h.Set("Content-Disposition", "attachment; filename="+fn)
-	h.Set("Content-Type", "text/csv; x-unix-mode=0644; name=\""+fn+"\"")
-	h.Set("Content-Transfer-Encoding", "7bit")
+	h.Set("Content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet; x-unix-mode=0644; name=\""+fn+"\"")
+	h.Set("Content-Transfer-Encoding", "base64")
+	//h.Set("Content-Transfer-Encoding", "7bit")
 	part, err = writer.CreatePart(h)
 	if err != nil {
 		return nil, err
 	}
-	_, err = part.Write(csvFile)
+
+	b := make([]byte, base64.StdEncoding.EncodedLen(len(csvFile)))
+	base64.StdEncoding.Encode(b, csvFile)
+
+	_, err = part.Write(b)
+	//_, err = part.Write(csvFile)
 	if err != nil {
 		return nil, err
 	}
+
 	err = writer.Close()
 	if err != nil {
 		return nil, err

go.mod

@@ -2,10 +2,17 @@ module github.com/tommzn/hob-timetracker
 
 go 1.19
 
+require (
+	github.com/aws/aws-sdk-go v1.44.168
+	github.com/calendarific/go-calendarific v0.0.0-20221115171631-30c5173a0a3f
+	github.com/tommzn/go-log v1.2.2
+	github.com/tommzn/go-utils v1.0.2
+	github.com/xuri/excelize/v2 v2.6.1
+	golang.org/x/exp v0.0.0-20221114191408-850992195362
+)
+
 require (
 	github.com/aws/aws-lambda-go v1.34.1 // indirect
-	github.com/aws/aws-sdk-go v1.44.168 // indirect
-	github.com/calendarific/go-calendarific v0.0.0-20221115171631-30c5173a0a3f // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fsnotify/fsnotify v1.4.9 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
@@ -27,14 +34,10 @@ require (
 	github.com/stretchr/testify v1.8.1 // indirect
 	github.com/subosito/gotenv v1.2.0 // indirect
 	github.com/tommzn/go-config v1.0.1 // indirect
-	github.com/tommzn/go-log v1.2.2 // indirect
 	github.com/tommzn/go-secrets v1.0.0 // indirect
-	github.com/tommzn/go-utils v1.0.2 // indirect
 	github.com/xuri/efp v0.0.0-20220603152613-6918739fd470 // indirect
-	github.com/xuri/excelize/v2 v2.6.1 // indirect
 	github.com/xuri/nfp v0.0.0-20220409054826-5e722a1d9e22 // indirect
 	golang.org/x/crypto v0.0.0-20220817201139-bc19a97f63c8 // indirect
-	golang.org/x/exp v0.0.0-20221114191408-850992195362 // indirect
 	golang.org/x/net v0.1.0 // indirect
 	golang.org/x/sys v0.1.0 // indirect
 	golang.org/x/text v0.4.0 // indirect