started extracting sending email to an interface

Author: dstpierre

email/dev.go

@@ -0,0 +1,19 @@
+package email
+
+import (
+	"fmt"
+	"staticbackend/internal"
+)
+
+type Dev struct{}
+
+func (d Dev) Send(data internal.SendMailData) error {
+	fmt.Println("====== SENDING EMAIL ======")
+	fmt.Println("from: ", data.From)
+	fmt.Println("ReplyTo: ", data.ReplyTo)
+	fmt.Println("to: ", data.To)
+	fmt.Println("subject: ", data.Subject)
+	fmt.Printf("body\n%s\n\n", data.TextBody)
+	fmt.Println("====== /SENDING EMAIL ======")
+	return nil
+}

email/ses.go

@@ -0,0 +1,75 @@
+package email
+
+import (
+	"fmt"
+	"os"
+	"staticbackend/internal"
+	"strings"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/ses"
+
+	"staticbackend/internal"
+)
+
+type AWSSES struct{}
+
+func (AWSSES) Send(data internal.SendMailData) error {
+	if len(data.To) == 0 || strings.Index(data.To, "@") == -1 {
+		return fmt.Errorf("empty To email")
+	}
+
+	if len(data.ReplyTo) == 0 {
+		data.ReplyTo = data.From
+	}
+
+	charset := "UTF-8"
+
+	sess, err := session.NewSession(&aws.Config{
+		Region: aws.String(os.Getenv("AWS_REGION"))},
+	)
+	if err != nil {
+		return err
+	}
+
+	// Create an SES session.
+	svc := ses.New(sess)
+
+	// Assemble the email.
+	input := &ses.SendEmailInput{
+		Destination: &ses.Destination{
+			CcAddresses: []*string{},
+			ToAddresses: []*string{
+				aws.String(data.To),
+			},
+		},
+		Message: &ses.Message{
+			Body: &ses.Body{
+				Html: &ses.Content{
+					Charset: aws.String(charset),
+					Data:    aws.String(data.HTMLBody),
+				},
+				Text: &ses.Content{
+					Charset: aws.String(charset),
+					Data:    aws.String(data.TextBody),
+				},
+			},
+			Subject: &ses.Content{
+				Charset: aws.String(charset),
+				Data:    aws.String(data.Subject),
+			},
+		},
+		Source:           aws.String(fromEmail),
+		ReplyToAddresses: aws.StringSlice([]string{data.ReplyTo}),
+		// Uncomment to use a configuration set
+		//ConfigurationSetName: aws.String(ConfigurationSet),
+	}
+
+	// Attempt to send the email.
+	if _, err := svc.SendEmail(input); err != nil {
+		return err
+	}
+
+	return nil
+}

internal/mailer.go

@@ -0,0 +1,18 @@
+package internal
+
+// SendMailData contains necessary fields to send an email
+type SendMailData struct {
+	From     string
+	FromName string
+	To       string
+	ToName   string
+	Subject  string
+	HTMLBody string
+	TextBody string
+	ReplyTo  string
+}
+
+// Mailer is used to have different implementation for sending email
+type Mailer interface {
+	Send(SendMailData) error
+}