81 lines
1.5 KiB
Go
81 lines
1.5 KiB
Go
package validator
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import (
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"net/mail"
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"strings"
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"gitlab.com/etke.cc/go/trysmtp"
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)
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// Email checks if email is valid
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func (v *V) Email(email string) bool {
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// edge case: email may be optional
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if email == "" {
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return !v.enforce.Email
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}
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length := len(email)
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// email cannot too short and too big
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if length < 3 || length > 254 {
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v.log.Info("email %s invalid, reason: length", email)
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return false
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}
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_, err := mail.ParseAddress(email)
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if err != nil {
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v.log.Info("email %s invalid, reason: %v", email, err)
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return false
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}
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emailb := []byte(email)
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for _, spamregex := range v.spamlist {
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if spamregex.Match(emailb) {
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v.log.Info("email %s invalid, reason: spamlist", email)
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return false
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}
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}
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if v.enforce.MX {
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if v.emailNoMX(email) {
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return false
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}
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}
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if v.enforce.SMTP {
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if v.emailNoSMTP(email) {
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return false
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}
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}
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return true
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}
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func (v *V) emailNoMX(email string) bool {
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at := strings.LastIndex(email, "@")
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domain := email[at+1:]
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nomx := !v.MX(domain)
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if nomx {
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v.log.Info("email %s domain %s invalid, reason: no MX", email, domain)
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return true
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}
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return false
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}
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func (v *V) emailNoSMTP(email string) bool {
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client, err := trysmtp.Connect(v.from, email)
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if err != nil {
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if strings.HasPrefix(err.Error(), "45") {
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v.log.Info("email %s may be invalid, reason: SMTP check (%v)", email, err)
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return false
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}
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v.log.Info("email %s invalid, reason: SMTP check (%v)", email, err)
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return true
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}
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defer client.Close()
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return false
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}
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