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package http
import (
"fmt"
"net"
"strconv"
"strings"
)
// ValidateEndpointHost validates that the host string passed in is a valid RFC
// 3986 host. Returns error if the host is not valid.
func ValidateEndpointHost(host string) error {
var errors strings.Builder
var hostname string
var port string
var err error
if strings.Contains(host, ":") {
hostname, port, err = net.SplitHostPort(host)
if err != nil {
errors.WriteString(fmt.Sprintf("\n endpoint %v, failed to parse, got ", host))
errors.WriteString(err.Error())
}
if !ValidPortNumber(port) {
errors.WriteString(fmt.Sprintf("port number should be in range [0-65535], got %v", port))
}
} else {
hostname = host
}
labels := strings.Split(hostname, ".")
for i, label := range labels {
if i == len(labels)-1 && len(label) == 0 {
// Allow trailing dot for FQDN hosts.
continue
}
if !ValidHostLabel(label) {
errors.WriteString("\nendpoint host domain labels must match \"[a-zA-Z0-9-]{1,63}\", but found: ")
errors.WriteString(label)
}
}
if len(hostname) == 0 && len(port) != 0 {
errors.WriteString("\nendpoint host with port must not be empty")
}
if len(hostname) > 255 {
errors.WriteString(fmt.Sprintf("\nendpoint host must be less than 255 characters, but was %d", len(hostname)))
}
if len(errors.String()) > 0 {
return fmt.Errorf("invalid endpoint host%s", errors.String())
}
return nil
}
// ValidPortNumber returns whether the port is valid RFC 3986 port.
func ValidPortNumber(port string) bool {
i, err := strconv.Atoi(port)
if err != nil {
return false
}
if i < 0 || i > 65535 {
return false
}
return true
}
// ValidHostLabel returns whether the label is a valid RFC 3986 host abel.
func ValidHostLabel(label string) bool {
if l := len(label); l == 0 || l > 63 {
return false
}
for _, r := range label {
switch {
case r >= '0' && r <= '9':
case r >= 'A' && r <= 'Z':
case r >= 'a' && r <= 'z':
case r == '-':
default:
return false
}
}
return true
}
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