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