writer_test.go

Documentation: mime/multipart

     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 multipart
     6  
     7  import (
     8  	"bytes"
     9  	"io"
    10  	"mime"
    11  	"net/textproto"
    12  	"strings"
    13  	"testing"
    14  )
    15  
    16  func TestWriter(t *testing.T) {
    17  	fileContents := []byte("my file contents")
    18  
    19  	var b bytes.Buffer
    20  	w := NewWriter(&b)
    21  	{
    22  		part, err := w.CreateFormFile("myfile", "my-file.txt")
    23  		if err != nil {
    24  			t.Fatalf("CreateFormFile: %v", err)
    25  		}
    26  		part.Write(fileContents)
    27  		err = w.WriteField("key", "val")
    28  		if err != nil {
    29  			t.Fatalf("WriteField: %v", err)
    30  		}
    31  		part.Write([]byte("val"))
    32  		err = w.Close()
    33  		if err != nil {
    34  			t.Fatalf("Close: %v", err)
    35  		}
    36  		s := b.String()
    37  		if len(s) == 0 {
    38  			t.Fatal("String: unexpected empty result")
    39  		}
    40  		if s[0] == '\r' || s[0] == '\n' {
    41  			t.Fatal("String: unexpected newline")
    42  		}
    43  	}
    44  
    45  	r := NewReader(&b, w.Boundary())
    46  
    47  	part, err := r.NextPart()
    48  	if err != nil {
    49  		t.Fatalf("part 1: %v", err)
    50  	}
    51  	if g, e := part.FormName(), "myfile"; g != e {
    52  		t.Errorf("part 1: want form name %q, got %q", e, g)
    53  	}
    54  	slurp, err := io.ReadAll(part)
    55  	if err != nil {
    56  		t.Fatalf("part 1: ReadAll: %v", err)
    57  	}
    58  	if e, g := string(fileContents), string(slurp); e != g {
    59  		t.Errorf("part 1: want contents %q, got %q", e, g)
    60  	}
    61  
    62  	part, err = r.NextPart()
    63  	if err != nil {
    64  		t.Fatalf("part 2: %v", err)
    65  	}
    66  	if g, e := part.FormName(), "key"; g != e {
    67  		t.Errorf("part 2: want form name %q, got %q", e, g)
    68  	}
    69  	slurp, err = io.ReadAll(part)
    70  	if err != nil {
    71  		t.Fatalf("part 2: ReadAll: %v", err)
    72  	}
    73  	if e, g := "val", string(slurp); e != g {
    74  		t.Errorf("part 2: want contents %q, got %q", e, g)
    75  	}
    76  
    77  	part, err = r.NextPart()
    78  	if part != nil || err == nil {
    79  		t.Fatalf("expected end of parts; got %v, %v", part, err)
    80  	}
    81  }
    82  
    83  func TestWriterSetBoundary(t *testing.T) {
    84  	tests := []struct {
    85  		b  string
    86  		ok bool
    87  	}{
    88  		{"abc", true},
    89  		{"", false},
    90  		{"ungültig", false},
    91  		{"!", false},
    92  		{strings.Repeat("x", 70), true},
    93  		{strings.Repeat("x", 71), false},
    94  		{"bad!ascii!", false},
    95  		{"my-separator", true},
    96  		{"with space", true},
    97  		{"badspace ", false},
    98  		{"(boundary)", true},
    99  	}
   100  	for i, tt := range tests {
   101  		var b strings.Builder
   102  		w := NewWriter(&b)
   103  		err := w.SetBoundary(tt.b)
   104  		got := err == nil
   105  		if got != tt.ok {
   106  			t.Errorf("%d. boundary %q = %v (%v); want %v", i, tt.b, got, err, tt.ok)
   107  		} else if tt.ok {
   108  			got := w.Boundary()
   109  			if got != tt.b {
   110  				t.Errorf("boundary = %q; want %q", got, tt.b)
   111  			}
   112  
   113  			ct := w.FormDataContentType()
   114  			mt, params, err := mime.ParseMediaType(ct)
   115  			if err != nil {
   116  				t.Errorf("could not parse Content-Type %q: %v", ct, err)
   117  			} else if mt != "multipart/form-data" {
   118  				t.Errorf("unexpected media type %q; want %q", mt, "multipart/form-data")
   119  			} else if b := params["boundary"]; b != tt.b {
   120  				t.Errorf("unexpected boundary parameter %q; want %q", b, tt.b)
   121  			}
   122  
   123  			w.Close()
   124  			wantSub := "\r\n--" + tt.b + "--\r\n"
   125  			if got := b.String(); !strings.Contains(got, wantSub) {
   126  				t.Errorf("expected %q in output. got: %q", wantSub, got)
   127  			}
   128  		}
   129  	}
   130  }
   131  
   132  func TestWriterBoundaryGoroutines(t *testing.T) {
   133  	// Verify there's no data race accessing any lazy boundary if it's used by
   134  	// different goroutines. This was previously broken by
   135  	// https://codereview.appspot.com/95760043/ and reverted in
   136  	// https://codereview.appspot.com/117600043/
   137  	w := NewWriter(io.Discard)
   138  	done := make(chan int)
   139  	go func() {
   140  		w.CreateFormField("foo")
   141  		done <- 1
   142  	}()
   143  	w.Boundary()
   144  	<-done
   145  }
   146  
   147  func TestSortedHeader(t *testing.T) {
   148  	var buf strings.Builder
   149  	w := NewWriter(&buf)
   150  	if err := w.SetBoundary("MIMEBOUNDARY"); err != nil {
   151  		t.Fatalf("Error setting mime boundary: %v", err)
   152  	}
   153  
   154  	header := textproto.MIMEHeader{
   155  		"A": {"2"},
   156  		"B": {"5", "7", "6"},
   157  		"C": {"4"},
   158  		"M": {"3"},
   159  		"Z": {"1"},
   160  	}
   161  
   162  	part, err := w.CreatePart(header)
   163  	if err != nil {
   164  		t.Fatalf("Unable to create part: %v", err)
   165  	}
   166  	part.Write([]byte("foo"))
   167  
   168  	w.Close()
   169  
   170  	want := "--MIMEBOUNDARY\r\nA: 2\r\nB: 5\r\nB: 7\r\nB: 6\r\nC: 4\r\nM: 3\r\nZ: 1\r\n\r\nfoo\r\n--MIMEBOUNDARY--\r\n"
   171  	if want != buf.String() {
   172  		t.Fatalf("\n got: %q\nwant: %q\n", buf.String(), want)
   173  	}
   174  }
   175
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