| package protocol |
| |
| import ( |
| "strings" |
| |
| "github.com/aws/aws-sdk-go/aws/request" |
| ) |
| |
| // 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} |
| labels := strings.Split(host, ".") |
| |
| 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(host) > 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 |
| } |