Basic email sending

internal/mail/mailer.go

@@ -1,11 +1,17 @@
 package mail
 
+const (
+	ContentTypeHTML = "text/html"
+	ContentTypeText = "text/plain"
+)
+
 type Option struct {
 	Host               string
 	Port               int
 	User               string
 	Password           string
 	InsecureSkipVerify bool
+	UseStartTLS        bool
 }
 
 type OptionFunc func(*Option)
@@ -14,6 +20,33 @@ type Mailer struct {
 	opt *Option
 }
 
-func NewMailer(funcs ...OptionFunc) *Mailer {
-	return &Mailer{}
+func WithTLS(useStartTLS, insecureSkipVerify bool) OptionFunc {
+	return func(opt *Option) {
+		opt.UseStartTLS = useStartTLS
+		opt.InsecureSkipVerify = insecureSkipVerify
+	}
+}
+
+func WithServer(host string, port int) OptionFunc {
+	return func(opt *Option) {
+		opt.Host = host
+		opt.Port = port
+	}
+}
+
+func WithCredentials(user, password string) OptionFunc {
+	return func(opt *Option) {
+		opt.User = user
+		opt.Password = password
+	}
+}
+
+func NewMailer(funcs ...OptionFunc) *Mailer {
+	opt := &Option{}
+
+	for _, fn := range funcs {
+		fn(opt)
+	}
+
+	return &Mailer{opt}
 }

internal/mail/send.go

@@ -40,10 +40,14 @@ func WithCharset(charset string) func(*SendOption) {
 	}
 }
 
-func WithFrom(address string, name string) func(*SendOption) {
+func WithSender(address string, name string) func(*SendOption) {
 	return WithAddressHeader("From", address, name)
 }
 
+func WithSubject(subject string) func(*SendOption) {
+	return WithHeader("Subject", subject)
+}
+
 func WithAddressHeader(field, address, name string) func(*SendOption) {
 	return func(opt *SendOption) {
 		opt.AddressHeaders = append(opt.AddressHeaders, AddressHeader{field, address, name})
@@ -56,14 +60,32 @@ func WithHeader(field string, values ...string) func(*SendOption) {
 	}
 }
 
+func WithRecipients(addresses ...string) func(*SendOption) {
+	return WithHeader("To", addresses...)
+}
+
+func WithCopies(addresses ...string) func(*SendOption) {
+	return WithHeader("Cc", addresses...)
+}
+
+func WithInvisibleCopies(addresses ...string) func(*SendOption) {
+	return WithHeader("Cci", addresses...)
+}
+
 func WithBody(contentType string, content string, setting gomail.PartSetting) func(*SendOption) {
 	return func(opt *SendOption) {
+		if setting == nil {
+			setting = gomail.SetPartEncoding(gomail.Unencoded)
+		}
 		opt.Body = Body{contentType, content, setting}
 	}
 }
 
 func WithAlternativeBody(contentType string, content string, setting gomail.PartSetting) func(*SendOption) {
 	return func(opt *SendOption) {
+		if setting == nil {
+			setting = gomail.SetPartEncoding(gomail.Unencoded)
+		}
 		opt.AlternativeBodies = append(opt.AlternativeBodies, Body{contentType, content, setting})
 	}
 }