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 bytes.Buffer
	 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 bytes.Buffer
	 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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