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
5package multipart
6
7import (
8	"bytes"
9	"io"
10	"mime"
11	"net/textproto"
12	"strings"
13	"testing"
14)
15
16func 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
83func 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
132func 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
147func 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