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Source file src/net/http/sniff_test.go

Documentation: net/http

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package http_test
     6  
     7  import (
     8  	"bytes"
     9  	"fmt"
    10  	"io"
    11  	"io/ioutil"
    12  	"log"
    13  	. "net/http"
    14  	"reflect"
    15  	"strconv"
    16  	"strings"
    17  	"testing"
    18  )
    19  
    20  var sniffTests = []struct {
    21  	desc        string
    22  	data        []byte
    23  	contentType string
    24  }{
    25  	// Some nonsense.
    26  	{"Empty", []byte{}, "text/plain; charset=utf-8"},
    27  	{"Binary", []byte{1, 2, 3}, "application/octet-stream"},
    28  
    29  	{"HTML document #1", []byte(`<HtMl><bOdY>blah blah blah</body></html>`), "text/html; charset=utf-8"},
    30  	{"HTML document #2", []byte(`<HTML></HTML>`), "text/html; charset=utf-8"},
    31  	{"HTML document #3 (leading whitespace)", []byte(`   <!DOCTYPE HTML>...`), "text/html; charset=utf-8"},
    32  	{"HTML document #4 (leading CRLF)", []byte("\r\n<html>..."), "text/html; charset=utf-8"},
    33  
    34  	{"Plain text", []byte(`This is not HTML. It has ☃ though.`), "text/plain; charset=utf-8"},
    35  
    36  	{"XML", []byte("\n<?xml!"), "text/xml; charset=utf-8"},
    37  
    38  	// Image types.
    39  	{"GIF 87a", []byte(`GIF87a`), "image/gif"},
    40  	{"GIF 89a", []byte(`GIF89a...`), "image/gif"},
    41  
    42  	// Audio types.
    43  	{"MIDI audio", []byte("MThd\x00\x00\x00\x06\x00\x01"), "audio/midi"},
    44  	{"MP3 audio/MPEG audio", []byte("ID3\x03\x00\x00\x00\x00\x0f"), "audio/mpeg"},
    45  	{"WAV audio #1", []byte("RIFFb\xb8\x00\x00WAVEfmt \x12\x00\x00\x00\x06"), "audio/wave"},
    46  	{"WAV audio #2", []byte("RIFF,\x00\x00\x00WAVEfmt \x12\x00\x00\x00\x06"), "audio/wave"},
    47  	{"AIFF audio #1", []byte("FORM\x00\x00\x00\x00AIFFCOMM\x00\x00\x00\x12\x00\x01\x00\x00\x57\x55\x00\x10\x40\x0d\xf3\x34"), "audio/aiff"},
    48  
    49  	{"OGG audio", []byte("OggS\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x7e\x46\x00\x00\x00\x00\x00\x00\x1f\xf6\xb4\xfc\x01\x1e\x01\x76\x6f\x72"), "application/ogg"},
    50  	{"Must not match OGG", []byte("owow\x00"), "application/octet-stream"},
    51  	{"Must not match OGG", []byte("oooS\x00"), "application/octet-stream"},
    52  	{"Must not match OGG", []byte("oggS\x00"), "application/octet-stream"},
    53  
    54  	// Video types.
    55  	{"MP4 video", []byte("\x00\x00\x00\x18ftypmp42\x00\x00\x00\x00mp42isom<\x06t\xbfmdat"), "video/mp4"},
    56  	{"AVI video #1", []byte("RIFF,O\n\x00AVI LISTÀ"), "video/avi"},
    57  	{"AVI video #2", []byte("RIFF,\n\x00\x00AVI LISTÀ"), "video/avi"},
    58  
    59  	// Font types.
    60  	// {"MS.FontObject", []byte("\x00\x00")},
    61  	{"TTF sample  I", []byte("\x00\x01\x00\x00\x00\x17\x01\x00\x00\x04\x01\x60\x4f"), "application/font-ttf"},
    62  	{"TTF sample II", []byte("\x00\x01\x00\x00\x00\x0e\x00\x80\x00\x03\x00\x60\x46"), "application/font-ttf"},
    63  
    64  	{"OTTO sample  I", []byte("\x4f\x54\x54\x4f\x00\x0e\x00\x80\x00\x03\x00\x60\x42\x41\x53\x45"), "application/font-off"},
    65  
    66  	{"woff sample  I", []byte("\x77\x4f\x46\x46\x00\x01\x00\x00\x00\x00\x30\x54\x00\x0d\x00\x00"), "application/font-woff"},
    67  	// Woff2 is not yet recognized, change this test once mime-sniff working group adds woff2
    68  	{"woff2 not recognized", []byte("\x77\x4f\x46\x32\x00\x01\x00\x00\x00"), "application/octet-stream"},
    69  }
    70  
    71  func TestDetectContentType(t *testing.T) {
    72  	for _, tt := range sniffTests {
    73  		ct := DetectContentType(tt.data)
    74  		if ct != tt.contentType {
    75  			t.Errorf("%v: DetectContentType = %q, want %q", tt.desc, ct, tt.contentType)
    76  		}
    77  	}
    78  }
    79  
    80  func TestServerContentType_h1(t *testing.T) { testServerContentType(t, h1Mode) }
    81  func TestServerContentType_h2(t *testing.T) { testServerContentType(t, h2Mode) }
    82  
    83  func testServerContentType(t *testing.T, h2 bool) {
    84  	setParallel(t)
    85  	defer afterTest(t)
    86  	cst := newClientServerTest(t, h2, HandlerFunc(func(w ResponseWriter, r *Request) {
    87  		i, _ := strconv.Atoi(r.FormValue("i"))
    88  		tt := sniffTests[i]
    89  		n, err := w.Write(tt.data)
    90  		if n != len(tt.data) || err != nil {
    91  			log.Fatalf("%v: Write(%q) = %v, %v want %d, nil", tt.desc, tt.data, n, err, len(tt.data))
    92  		}
    93  	}))
    94  	defer cst.close()
    95  
    96  	for i, tt := range sniffTests {
    97  		resp, err := cst.c.Get(cst.ts.URL + "/?i=" + strconv.Itoa(i))
    98  		if err != nil {
    99  			t.Errorf("%v: %v", tt.desc, err)
   100  			continue
   101  		}
   102  		// DetectContentType is defined to return
   103  		// text/plain; charset=utf-8 for an empty body,
   104  		// but as of Go 1.10 the HTTP server has been changed
   105  		// to return no content-type at all for an empty body.
   106  		// Adjust the expectation here.
   107  		wantContentType := tt.contentType
   108  		if len(tt.data) == 0 {
   109  			wantContentType = ""
   110  		}
   111  		if ct := resp.Header.Get("Content-Type"); ct != wantContentType {
   112  			t.Errorf("%v: Content-Type = %q, want %q", tt.desc, ct, wantContentType)
   113  		}
   114  		data, err := ioutil.ReadAll(resp.Body)
   115  		if err != nil {
   116  			t.Errorf("%v: reading body: %v", tt.desc, err)
   117  		} else if !bytes.Equal(data, tt.data) {
   118  			t.Errorf("%v: data is %q, want %q", tt.desc, data, tt.data)
   119  		}
   120  		resp.Body.Close()
   121  	}
   122  }
   123  
   124  // Issue 5953: shouldn't sniff if the handler set a Content-Type header,
   125  // even if it's the empty string.
   126  func TestServerIssue5953_h1(t *testing.T) { testServerIssue5953(t, h1Mode) }
   127  func TestServerIssue5953_h2(t *testing.T) { testServerIssue5953(t, h2Mode) }
   128  func testServerIssue5953(t *testing.T, h2 bool) {
   129  	defer afterTest(t)
   130  	cst := newClientServerTest(t, h2, HandlerFunc(func(w ResponseWriter, r *Request) {
   131  		w.Header()["Content-Type"] = []string{""}
   132  		fmt.Fprintf(w, "<html><head></head><body>hi</body></html>")
   133  	}))
   134  	defer cst.close()
   135  
   136  	resp, err := cst.c.Get(cst.ts.URL)
   137  	if err != nil {
   138  		t.Fatal(err)
   139  	}
   140  
   141  	got := resp.Header["Content-Type"]
   142  	want := []string{""}
   143  	if !reflect.DeepEqual(got, want) {
   144  		t.Errorf("Content-Type = %q; want %q", got, want)
   145  	}
   146  	resp.Body.Close()
   147  }
   148  
   149  func TestContentTypeWithCopy_h1(t *testing.T) { testContentTypeWithCopy(t, h1Mode) }
   150  func TestContentTypeWithCopy_h2(t *testing.T) { testContentTypeWithCopy(t, h2Mode) }
   151  func testContentTypeWithCopy(t *testing.T, h2 bool) {
   152  	defer afterTest(t)
   153  
   154  	const (
   155  		input    = "\n<html>\n\t<head>\n"
   156  		expected = "text/html; charset=utf-8"
   157  	)
   158  
   159  	cst := newClientServerTest(t, h2, HandlerFunc(func(w ResponseWriter, r *Request) {
   160  		// Use io.Copy from a bytes.Buffer to trigger ReadFrom.
   161  		buf := bytes.NewBuffer([]byte(input))
   162  		n, err := io.Copy(w, buf)
   163  		if int(n) != len(input) || err != nil {
   164  			t.Errorf("io.Copy(w, %q) = %v, %v want %d, nil", input, n, err, len(input))
   165  		}
   166  	}))
   167  	defer cst.close()
   168  
   169  	resp, err := cst.c.Get(cst.ts.URL)
   170  	if err != nil {
   171  		t.Fatalf("Get: %v", err)
   172  	}
   173  	if ct := resp.Header.Get("Content-Type"); ct != expected {
   174  		t.Errorf("Content-Type = %q, want %q", ct, expected)
   175  	}
   176  	data, err := ioutil.ReadAll(resp.Body)
   177  	if err != nil {
   178  		t.Errorf("reading body: %v", err)
   179  	} else if !bytes.Equal(data, []byte(input)) {
   180  		t.Errorf("data is %q, want %q", data, input)
   181  	}
   182  	resp.Body.Close()
   183  }
   184  
   185  func TestSniffWriteSize_h1(t *testing.T) { testSniffWriteSize(t, h1Mode) }
   186  func TestSniffWriteSize_h2(t *testing.T) { testSniffWriteSize(t, h2Mode) }
   187  func testSniffWriteSize(t *testing.T, h2 bool) {
   188  	setParallel(t)
   189  	defer afterTest(t)
   190  	cst := newClientServerTest(t, h2, HandlerFunc(func(w ResponseWriter, r *Request) {
   191  		size, _ := strconv.Atoi(r.FormValue("size"))
   192  		written, err := io.WriteString(w, strings.Repeat("a", size))
   193  		if err != nil {
   194  			t.Errorf("write of %d bytes: %v", size, err)
   195  			return
   196  		}
   197  		if written != size {
   198  			t.Errorf("write of %d bytes wrote %d bytes", size, written)
   199  		}
   200  	}))
   201  	defer cst.close()
   202  	for _, size := range []int{0, 1, 200, 600, 999, 1000, 1023, 1024, 512 << 10, 1 << 20} {
   203  		res, err := cst.c.Get(fmt.Sprintf("%s/?size=%d", cst.ts.URL, size))
   204  		if err != nil {
   205  			t.Fatalf("size %d: %v", size, err)
   206  		}
   207  		if _, err := io.Copy(ioutil.Discard, res.Body); err != nil {
   208  			t.Fatalf("size %d: io.Copy of body = %v", size, err)
   209  		}
   210  		if err := res.Body.Close(); err != nil {
   211  			t.Fatalf("size %d: body Close = %v", size, err)
   212  		}
   213  	}
   214  }
   215  

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