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|
package protocol
import (
"github.com/aws/aws-sdk-go/aws/request"
"net"
"strconv"
"strings"
)
// ValidateEndpointHostHandler is a request handler that will validate the
// request endpoint's hosts is a valid RFC 3986 host.
var ValidateEndpointHostHandler = request.NamedHandler{
Name: "awssdk.protocol.ValidateEndpointHostHandler",
Fn: func(r *request.Request) {
err := ValidateEndpointHost(r.Operation.Name, r.HTTPRequest.URL.Host)
if err != nil {
r.Error = err
}
},
}
// ValidateEndpointHost validates that the host string passed in is a valid RFC
// 3986 host. Returns error if the host is not valid.
func ValidateEndpointHost(opName, host string) error {
paramErrs := request.ErrInvalidParams{Context: opName}
var hostname string
var port string
var err error
if strings.Contains(host, ":") {
hostname, port, err = net.SplitHostPort(host)
if err != nil {
paramErrs.Add(request.NewErrParamFormat("endpoint", err.Error(), host))
}
if !ValidPortNumber(port) {
paramErrs.Add(request.NewErrParamFormat("endpoint port number", "[0-65535]", 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) {
paramErrs.Add(request.NewErrParamFormat(
"endpoint host label", "[a-zA-Z0-9-]{1,63}", label))
}
}
if len(hostname) == 0 {
paramErrs.Add(request.NewErrParamMinLen("endpoint host", 1))
}
if len(hostname) > 255 {
paramErrs.Add(request.NewErrParamMaxLen(
"endpoint host", 255, host,
))
}
if paramErrs.Len() > 0 {
return paramErrs
}
return nil
}
// ValidHostLabel returns if the label is a valid RFC 3986 host label.
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
}
// ValidPortNumber return if 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
}
|
