feat: smtp mail provider implementation

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
+}