k8s.io/apiserver@v0.31.1/pkg/util/proxy/translatinghandler_test.go (about)

     1  /*
     2  Copyright 2023 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package proxy
    18  
    19  import (
    20  	"net/http"
    21  	"testing"
    22  
    23  	"github.com/stretchr/testify/require"
    24  	"k8s.io/apimachinery/pkg/util/httpstream/wsstream"
    25  )
    26  
    27  // fakeHandler implements http.Handler interface
    28  type fakeHandler struct {
    29  	served bool
    30  }
    31  
    32  // ServeHTTP stores the fact that this fake handler was called.
    33  func (fh *fakeHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
    34  	fh.served = true
    35  }
    36  
    37  func TestTranslatingHandler(t *testing.T) {
    38  	tests := map[string]struct {
    39  		upgrade          string
    40  		version          string
    41  		expectTranslator bool
    42  	}{
    43  		"websocket/v5 upgrade, serves translator": {
    44  			upgrade:          "websocket",
    45  			version:          "v5.channel.k8s.io",
    46  			expectTranslator: true,
    47  		},
    48  		"websocket/v5 upgrade with multiple other versions, serves translator": {
    49  			upgrade:          "websocket",
    50  			version:          "v5.channel.k8s.io, v4.channel.k8s.io, v3.channel.k8s.io",
    51  			expectTranslator: true,
    52  		},
    53  		"websocket/v5 upgrade with multiple other versions out of order, serves translator": {
    54  			upgrade:          "websocket",
    55  			version:          "v4.channel.k8s.io, v3.channel.k8s.io, v5.channel.k8s.io",
    56  			expectTranslator: true,
    57  		},
    58  		"no upgrade, serves delegate": {
    59  			upgrade:          "",
    60  			version:          "",
    61  			expectTranslator: false,
    62  		},
    63  		"no upgrade with v5, serves delegate": {
    64  			upgrade:          "",
    65  			version:          "v5.channel.k8s.io",
    66  			expectTranslator: false,
    67  		},
    68  		"websocket/v5 wrong case upgrade, serves delegage": {
    69  			upgrade:          "websocket",
    70  			version:          "v5.CHANNEL.k8s.io",
    71  			expectTranslator: false,
    72  		},
    73  		"spdy/v5 upgrade, serves delegate": {
    74  			upgrade:          "spdy",
    75  			version:          "v5.channel.k8s.io",
    76  			expectTranslator: false,
    77  		},
    78  		"spdy/v4 upgrade, serves delegate": {
    79  			upgrade:          "spdy",
    80  			version:          "v4.channel.k8s.io",
    81  			expectTranslator: false,
    82  		},
    83  		"websocket/v4 upgrade, serves delegate": {
    84  			upgrade:          "websocket",
    85  			version:          "v4.channel.k8s.io",
    86  			expectTranslator: false,
    87  		},
    88  		"websocket without version upgrade, serves delegate": {
    89  			upgrade:          "websocket",
    90  			version:          "",
    91  			expectTranslator: false,
    92  		},
    93  	}
    94  	for name, test := range tests {
    95  		req, err := http.NewRequest("GET", "http://www.example.com/", nil)
    96  		require.NoError(t, err)
    97  		if test.upgrade != "" {
    98  			req.Header.Add("Connection", "Upgrade")
    99  			req.Header.Add("Upgrade", test.upgrade)
   100  		}
   101  		if len(test.version) > 0 {
   102  			req.Header.Add(wsstream.WebSocketProtocolHeader, test.version)
   103  		}
   104  		delegate := fakeHandler{}
   105  		translator := fakeHandler{}
   106  		translatingHandler := NewTranslatingHandler(&delegate, &translator,
   107  			wsstream.IsWebSocketRequestWithStreamCloseProtocol)
   108  		translatingHandler.ServeHTTP(nil, req)
   109  		if !delegate.served && !translator.served {
   110  			t.Errorf("unexpected neither translator nor delegate served")
   111  			continue
   112  		}
   113  		if test.expectTranslator {
   114  			if !translator.served {
   115  				t.Errorf("%s: expected translator served, got delegate served", name)
   116  			}
   117  		} else if !delegate.served {
   118  			t.Errorf("%s: expected delegate served, got translator served", name)
   119  		}
   120  	}
   121  }