Fix s3 auth failed with X-Forwarded-Host and X-Forwarded-Port (#6650)

weed/s3api/auth_signature_v4.go

@@ -25,6 +25,7 @@ import (
 	"encoding/hex"
 	"hash"
 	"io"
+	"net"
 	"net/http"
 	"net/url"
 	"regexp"
@@ -720,16 +721,44 @@ func extractHostHeader(r *http.Request) string {
 	// If X-Forwarded-Port is set, use that too to form the host.
 	if forwardedHost != "" {
 		extractedHost := forwardedHost
-		if forwardedPort != "" && forwardedPort != "80" && forwardedPort != "443" {
-			extractedHost = forwardedHost + ":" + forwardedPort
+		host, port, err := net.SplitHostPort(extractedHost)
+		if err == nil {
+			extractedHost = host
+			if forwardedPort == "" {
+				forwardedPort = port
+			}
+		}
+		if !isDefaultPort(r.URL.Scheme, forwardedPort) {
+			extractedHost = net.JoinHostPort(forwardedHost, forwardedPort)
 		}
 		return extractedHost
 	} else {
 		// Go http server removes "host" from Request.Header
+		host := r.Host
+		if host == "" {
+			host = r.URL.Host
+		}
+		h, port, err := net.SplitHostPort(host)
+		if err != nil {
+			return r.Host
+		}
+		if isDefaultPort(r.URL.Scheme, port) {
+			return h
+		}
 		return r.Host
 	}
 }
 
+func isDefaultPort(scheme, port string) bool {
+	if port == "" {
+		return true
+	}
+
+	lowerCaseScheme := strings.ToLower(scheme)
+	return (lowerCaseScheme == "http" && port == "80") ||
+		(lowerCaseScheme == "https" && port == "443")
+}
+
 // getSignedHeaders generate a string i.e alphabetically sorted, semicolon-separated list of lowercase request header names
 func getSignedHeaders(signedHeaders http.Header) string {
 	var headers []string