proxy: fix hyphen issue when parsing target

fix issue #948
Signed-off-by: Tw <tw19881113@gmail.com>

caddyhttp/proxy/setup_test.go

@@ -111,6 +111,26 @@ func TestSetup(t *testing.T) {
 				"http://localhost:8085": {},
 			},
 		},
+		// test #10 test hyphen without port range
+		{
+			"proxy / http://localhost:8001/a--b",
+			false,
+			map[string]struct{}{
+				"http://localhost:8001/a--b": {},
+			},
+		},
+		// test #11 test hyphen with port range
+		{
+			"proxy / http://localhost:8001-8005/a--b",
+			false,
+			map[string]struct{}{
+				"http://localhost:8001/a--b": {},
+				"http://localhost:8002/a--b": {},
+				"http://localhost:8003/a--b": {},
+				"http://localhost:8004/a--b": {},
+				"http://localhost:8005/a--b": {},
+			},
+		},
 	} {
 		c := caddy.NewTestController("http", test.input)
 		err := setup(c)

caddyhttp/proxy/upstream.go

@@ -171,10 +171,15 @@ func parseUpstream(u string) ([]string, error) {
 
 		if colonIdx != -1 && colonIdx != protoIdx {
 			us := u[:colonIdx]
-			ports := u[len(us)+1:]
-			if separators := strings.Count(ports, "-"); separators > 1 {
-				return nil, fmt.Errorf("port range [%s] is invalid", ports)
-			} else if separators == 1 {
+			ue := ""
+			portsEnd := len(u)
+			if nextSlash := strings.Index(u[colonIdx:], "/"); nextSlash != -1 {
+				portsEnd = colonIdx + nextSlash
+				ue = u[portsEnd:]
+			}
+			ports := u[len(us)+1 : portsEnd]
+
+			if separators := strings.Count(ports, "-"); separators == 1 {
 				portsStr := strings.Split(ports, "-")
 				pIni, err := strconv.Atoi(portsStr[0])
 				if err != nil {
@@ -192,7 +197,7 @@ func parseUpstream(u string) ([]string, error) {
 
 				hosts := []string{}
 				for p := pIni; p <= pEnd; p++ {
-					hosts = append(hosts, fmt.Sprintf("%s:%d", us, p))
+					hosts = append(hosts, fmt.Sprintf("%s:%d%s", us, p, ue))
 				}
 				return hosts, nil
 			}