package email import "fmt" // BuildVerifyCodeEmail returns a locale-appropriate subject and HTML body for // the verification code email. Chinese domains get a Chinese email; all others // get an English one. func BuildVerifyCodeEmail(toEmail, code string) (subject, body string) { domain := toEmail[lastIndex(toEmail, '@')+1:] if chineseDomainRe.MatchString(domain) { return buildVerifyCodeZH(code) } return buildVerifyCodeEN(code) } func buildVerifyCodeZH(code string) (subject, body string) { subject = "您的验证码" body = fmt.Sprintf(` 验证码
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`, code) return } func buildVerifyCodeEN(code string) (subject, body string) { subject = "Your verification code" body = fmt.Sprintf(` Verification Code
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`, code) return } // lastIndex returns the last index of sep in s, or -1. func lastIndex(s string, sep byte) int { for i := len(s) - 1; i >= 0; i-- { if s[i] == sep { return i } } return -1 }