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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http_test
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"log"
. "net/http"
"net/http/httptest"
"reflect"
"strconv"
"strings"
"testing"
)
var sniffTests = []struct {
desc string
data []byte
contentType string
}{
// Some nonsense.
{"Empty", []byte{}, "text/plain; charset=utf-8"},
{"Binary", []byte{1, 2, 3}, "application/octet-stream"},
{"HTML document #1", []byte(`<HtMl><bOdY>blah blah blah</body></html>`), "text/html; charset=utf-8"},
{"HTML document #2", []byte(`<HTML></HTML>`), "text/html; charset=utf-8"},
{"HTML document #3 (leading whitespace)", []byte(` <!DOCTYPE HTML>...`), "text/html; charset=utf-8"},
{"HTML document #4 (leading CRLF)", []byte("\r\n<html>..."), "text/html; charset=utf-8"},
{"Plain text", []byte(`This is not HTML. It has ☃ though.`), "text/plain; charset=utf-8"},
{"XML", []byte("\n<?xml!"), "text/xml; charset=utf-8"},
// Image types.
{"GIF 87a", []byte(`GIF87a`), "image/gif"},
{"GIF 89a", []byte(`GIF89a...`), "image/gif"},
// TODO(dsymonds): Re-enable this when the spec is sorted w.r.t. MP4.
//{"MP4 video", []byte("\x00\x00\x00\x18ftypmp42\x00\x00\x00\x00mp42isom<\x06t\xbfmdat"), "video/mp4"},
//{"MP4 audio", []byte("\x00\x00\x00\x20ftypM4A \x00\x00\x00\x00M4A mp42isom\x00\x00\x00\x00"), "audio/mp4"},
}
func TestDetectContentType(t *testing.T) {
for _, tt := range sniffTests {
ct := DetectContentType(tt.data)
if ct != tt.contentType {
t.Errorf("%v: DetectContentType = %q, want %q", tt.desc, ct, tt.contentType)
}
}
}
func TestServerContentType(t *testing.T) {
defer afterTest(t)
ts := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {
i, _ := strconv.Atoi(r.FormValue("i"))
tt := sniffTests[i]
n, err := w.Write(tt.data)
if n != len(tt.data) || err != nil {
log.Fatalf("%v: Write(%q) = %v, %v want %d, nil", tt.desc, tt.data, n, err, len(tt.data))
}
}))
defer ts.Close()
for i, tt := range sniffTests {
resp, err := Get(ts.URL + "/?i=" + strconv.Itoa(i))
if err != nil {
t.Errorf("%v: %v", tt.desc, err)
continue
}
if ct := resp.Header.Get("Content-Type"); ct != tt.contentType {
t.Errorf("%v: Content-Type = %q, want %q", tt.desc, ct, tt.contentType)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
t.Errorf("%v: reading body: %v", tt.desc, err)
} else if !bytes.Equal(data, tt.data) {
t.Errorf("%v: data is %q, want %q", tt.desc, data, tt.data)
}
resp.Body.Close()
}
}
// Issue 5953: shouldn't sniff if the handler set a Content-Type header,
// even if it's the empty string.
func TestServerIssue5953(t *testing.T) {
defer afterTest(t)
ts := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {
w.Header()["Content-Type"] = []string{""}
fmt.Fprintf(w, "<html><head></head><body>hi</body></html>")
}))
defer ts.Close()
resp, err := Get(ts.URL)
if err != nil {
t.Fatal(err)
}
got := resp.Header["Content-Type"]
want := []string{""}
if !reflect.DeepEqual(got, want) {
t.Errorf("Content-Type = %q; want %q", got, want)
}
resp.Body.Close()
}
func TestContentTypeWithCopy(t *testing.T) {
defer afterTest(t)
const (
input = "\n<html>\n\t<head>\n"
expected = "text/html; charset=utf-8"
)
ts := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {
// Use io.Copy from a bytes.Buffer to trigger ReadFrom.
buf := bytes.NewBuffer([]byte(input))
n, err := io.Copy(w, buf)
if int(n) != len(input) || err != nil {
t.Errorf("io.Copy(w, %q) = %v, %v want %d, nil", input, n, err, len(input))
}
}))
defer ts.Close()
resp, err := Get(ts.URL)
if err != nil {
t.Fatalf("Get: %v", err)
}
if ct := resp.Header.Get("Content-Type"); ct != expected {
t.Errorf("Content-Type = %q, want %q", ct, expected)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
t.Errorf("reading body: %v", err)
} else if !bytes.Equal(data, []byte(input)) {
t.Errorf("data is %q, want %q", data, input)
}
resp.Body.Close()
}
func TestSniffWriteSize(t *testing.T) {
defer afterTest(t)
ts := httptest.NewServer(HandlerFunc(func(w ResponseWriter, r *Request) {
size, _ := strconv.Atoi(r.FormValue("size"))
written, err := io.WriteString(w, strings.Repeat("a", size))
if err != nil {
t.Errorf("write of %d bytes: %v", size, err)
return
}
if written != size {
t.Errorf("write of %d bytes wrote %d bytes", size, written)
}
}))
defer ts.Close()
for _, size := range []int{0, 1, 200, 600, 999, 1000, 1023, 1024, 512 << 10, 1 << 20} {
res, err := Get(fmt.Sprintf("%s/?size=%d", ts.URL, size))
if err != nil {
t.Fatalf("size %d: %v", size, err)
}
if _, err := io.Copy(ioutil.Discard, res.Body); err != nil {
t.Fatalf("size %d: io.Copy of body = %v", size, err)
}
if err := res.Body.Close(); err != nil {
t.Fatalf("size %d: body Close = %v", size, err)
}
}
}
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