feat: initialize nuntius project with full server implementation

pkg/contactform/validate.go

@@ -0,0 +1,111 @@
+//go:build linux || freebsd
+
+package contactform
+
+import (
+	"net/mail"
+	"strings"
+	"unicode/utf8"
+)
+
+// validServices is the allow-list for contact-type forms.
+var validServices = map[string]bool{
+	"":               true,
+	"architecture":   true,
+	"ai":             true,
+	"infrastructure": true,
+	"software":       true,
+	"unix":           true,
+	"other":          true,
+}
+
+// MinNameRunes is the minimum allowed length of a name.
+const MinNameRunes = 2
+
+// MaxNameRunes is the maximum allowed length of a name.
+const MaxNameRunes = 100
+
+// MinMessageRunes is the minimum allowed length of a message body.
+const MinMessageRunes = 10
+
+// MaxMessageRunes is the maximum allowed length of a message body.
+const MaxMessageRunes = 5000
+
+// Validate dispatches to the correct type-specific validator.
+// Supported types: contact, feedback, newsletter, generic. Default is "contact".
+func Validate(r *Request, formType string) []FieldError {
+	switch formType {
+	case "newsletter":
+		return validateNewsletter(r)
+	case "feedback", "generic":
+		return validateGeneric(r)
+	default:
+		return validateContact(r)
+	}
+}
+
+func validateContact(r *Request) []FieldError {
+	r.Name = strings.TrimSpace(r.Name)
+	r.Email = strings.TrimSpace(r.Email)
+	r.Service = strings.TrimSpace(r.Service)
+	r.Message = strings.TrimSpace(r.Message)
+
+	var errs []FieldError
+
+	if n := utf8.RuneCountInString(r.Name); n < MinNameRunes {
+		errs = append(errs, FieldError{Field: "name", Message: "name must be at least 2 characters"})
+	} else if n > MaxNameRunes {
+		errs = append(errs, FieldError{Field: "name", Message: "name must be at most 100 characters"})
+	}
+
+	if _, err := mail.ParseAddress(r.Email); err != nil {
+		errs = append(errs, FieldError{Field: "email", Message: "email is invalid"})
+	}
+
+	if !validServices[r.Service] {
+		errs = append(errs, FieldError{Field: "service", Message: "service is not a recognised value"})
+	}
+
+	if n := utf8.RuneCountInString(r.Message); n < MinMessageRunes {
+		errs = append(errs, FieldError{Field: "message", Message: "message must be at least 10 characters"})
+	} else if n > MaxMessageRunes {
+		errs = append(errs, FieldError{Field: "message", Message: "message must be at most 5000 characters"})
+	}
+
+	return errs
+}
+
+func validateNewsletter(r *Request) []FieldError {
+	r.Email = strings.TrimSpace(r.Email)
+
+	if _, err := mail.ParseAddress(r.Email); err != nil {
+		return []FieldError{{Field: "email", Message: "email is invalid"}}
+	}
+	return nil
+}
+
+func validateGeneric(r *Request) []FieldError {
+	r.Name = strings.TrimSpace(r.Name)
+	r.Email = strings.TrimSpace(r.Email)
+	r.Message = strings.TrimSpace(r.Message)
+
+	var errs []FieldError
+
+	if n := utf8.RuneCountInString(r.Name); n < MinNameRunes {
+		errs = append(errs, FieldError{Field: "name", Message: "name must be at least 2 characters"})
+	} else if n > MaxNameRunes {
+		errs = append(errs, FieldError{Field: "name", Message: "name must be at most 100 characters"})
+	}
+
+	if _, err := mail.ParseAddress(r.Email); err != nil {
+		errs = append(errs, FieldError{Field: "email", Message: "email is invalid"})
+	}
+
+	if n := utf8.RuneCountInString(r.Message); n < MinMessageRunes {
+		errs = append(errs, FieldError{Field: "message", Message: "message must be at least 10 characters"})
+	} else if n > MaxMessageRunes {
+		errs = append(errs, FieldError{Field: "message", Message: "message must be at most 5000 characters"})
+	}
+
+	return errs
+}