feat: smtp mail provider implementation

models/mail.go

@@ -0,0 +1,45 @@
+package models
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Mail struct {
+	From    MailAddress
+	To      MailAddresses
+	Subject string
+	Body    string
+	Type    string
+}
+
+func (m *Mail) WithText(text string) *Mail {
+	m.Body = text
+	m.Type = "text/plain; charset=UTF-8"
+	return m
+}
+
+func (m *Mail) WithHTML(html string) *Mail {
+	m.Body = html
+	m.Type = "text/html; charset=UTF-8"
+	return m
+}
+
+func (m *Mail) String() string {
+	return fmt.Sprintf("To: %s\r\n"+
+		"From: %s\r\n"+
+		"Subject: %s\r\n"+
+		"Content-Type: %s\r\n"+
+		"\r\n"+
+		"%s\r\n",
+		strings.Join(m.To.RawStrings(), ", "),
+		m.From.String(),
+		m.Subject,
+		m.Type,
+		m.Body,
+	)
+}
+
+func (m *Mail) Reader() *strings.Reader {
+	return strings.NewReader(m.String())
+}

models/mail_address.go

@@ -0,0 +1,57 @@
+package models
+
+import "regexp"
+
+const (
+	MailPattern      = "[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+"
+	EmailAddrPattern = ".*\\s<(" + MailPattern + ")>|(" + MailPattern + ")"
+)
+
+var (
+	mailRegex      *regexp.Regexp
+	emailAddrRegex *regexp.Regexp
+)
+
+func init() {
+	mailRegex = regexp.MustCompile(MailPattern)
+	emailAddrRegex = regexp.MustCompile(EmailAddrPattern)
+}
+
+type MailAddress string
+
+type MailAddresses []MailAddress
+
+func (m MailAddress) String() string {
+	return string(m)
+}
+
+func (m MailAddress) Raw() string {
+	match := emailAddrRegex.FindStringSubmatch(string(m))
+	if len(match) == 3 {
+		if match[2] != "" {
+			return match[2]
+		}
+		return match[1]
+	}
+	return ""
+}
+
+func (m MailAddress) Valid() bool {
+	return emailAddrRegex.Match([]byte(m))
+}
+
+func (m MailAddresses) Strings() []string {
+	out := make([]string, len(m))
+	for i, s := range m {
+		out[i] = s.String()
+	}
+	return out
+}
+
+func (m MailAddresses) RawStrings() []string {
+	out := make([]string, len(m))
+	for i, s := range m {
+		out[i] = s.Raw()
+	}
+	return out
+}

models/user.go

@@ -2,14 +2,6 @@ package models
 
 import "regexp"
 
-const (
-	MailPattern = "[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+"
-)
-
-var (
-	mailRegex *regexp.Regexp
-)
-
 func init() {
 	mailRegex = regexp.MustCompile(MailPattern)
 }
@@ -17,7 +9,7 @@ func init() {
 type User struct {
 	ID               string     `json:"id" gorm:"primary_key"`
 	ApiKey           string     `json:"api_key" gorm:"unique"`
-	Email            string     `json:"email"`
+	Email            string     `json:"email" gorm:"uniqueIndex:idx_user_email"`
 	Password         string     `json:"-"`
 	CreatedAt        CustomTime `gorm:"type:timestamp; default:CURRENT_TIMESTAMP" swaggertype:"string" format:"date" example:"2006-01-02 15:04:05.000"`
 	LastLoggedInAt   CustomTime `gorm:"type:timestamp; default:CURRENT_TIMESTAMP" swaggertype:"string" format:"date" example:"2006-01-02 15:04:05.000"`