Bootstrap copied BFF and local accounts with public Sendico contracts (#34)

backend/pkg/merrors/signup_email_policy.go

@@ -0,0 +1,78 @@
+package merrors
+
+import (
+	"errors"
+	"strings"
+)
+
+const (
+	SignupEmailPolicyCode = "signup_email_rejected"
+
+	SignupEmailPolicyReasonInvalidEmail     = "invalid_email"
+	SignupEmailPolicyReasonDisposableDomain = "disposable_domain"
+	SignupEmailPolicyReasonFreeDomain       = "free_domain"
+)
+
+var ErrSignupEmailPolicyRejected = Define(SignupEmailPolicyCode)
+
+type SignupEmailPolicyError struct {
+	reason string
+	domain string
+}
+
+func NormalizeSignupEmailPolicyReason(reason string) string {
+	switch strings.TrimSpace(reason) {
+	case SignupEmailPolicyReasonInvalidEmail:
+		return SignupEmailPolicyReasonInvalidEmail
+	case SignupEmailPolicyReasonDisposableDomain:
+		return SignupEmailPolicyReasonDisposableDomain
+	case SignupEmailPolicyReasonFreeDomain:
+		return SignupEmailPolicyReasonFreeDomain
+	default:
+		return SignupEmailPolicyReasonInvalidEmail
+	}
+}
+
+func IsSignupEmailPolicyReason(reason string) bool {
+	return strings.TrimSpace(reason) == NormalizeSignupEmailPolicyReason(reason)
+}
+
+func (e *SignupEmailPolicyError) Error() string {
+	if e == nil || e.reason == "" {
+		return SignupEmailPolicyCode
+	}
+	return SignupEmailPolicyCode + ": " + e.reason
+}
+
+func (e *SignupEmailPolicyError) Unwrap() error {
+	return ErrSignupEmailPolicyRejected
+}
+
+func (e *SignupEmailPolicyError) Reason() string {
+	if e == nil {
+		return ""
+	}
+	return strings.TrimSpace(e.reason)
+}
+
+func (e *SignupEmailPolicyError) Domain() string {
+	if e == nil {
+		return ""
+	}
+	return strings.TrimSpace(e.domain)
+}
+
+func SignupEmailPolicyRejected(reason, domain string) error {
+	return &SignupEmailPolicyError{
+		reason: NormalizeSignupEmailPolicyReason(reason),
+		domain: strings.TrimSpace(domain),
+	}
+}
+
+func AsSignupEmailPolicyError(err error) (*SignupEmailPolicyError, bool) {
+	var policyErr *SignupEmailPolicyError
+	if errors.As(err, &policyErr) && policyErr != nil {
+		return policyErr, true
+	}
+	return nil, false
+}