mirror of
https://github.com/golang/go
synced 2024-11-12 10:20:27 -07:00
http: ServeFile to handle Range header for partial requests
and send Content-Length. Also includes some testing of the server code. R=rsc CC=golang-dev https://golang.org/cl/2831041
This commit is contained in:
parent
8984fa8fce
commit
aa9c213e56
@ -12,6 +12,7 @@ import (
|
||||
"mime"
|
||||
"os"
|
||||
"path"
|
||||
"strconv"
|
||||
"strings"
|
||||
"time"
|
||||
"utf8"
|
||||
@ -130,6 +131,9 @@ func serveFile(w ResponseWriter, r *Request, name string, redirect bool) {
|
||||
}
|
||||
|
||||
// serve file
|
||||
size := d.Size
|
||||
code := StatusOK
|
||||
|
||||
// use extension to find content type.
|
||||
ext := path.Ext(name)
|
||||
if ctype := mime.TypeByExtension(ext); ctype != "" {
|
||||
@ -137,16 +141,40 @@ func serveFile(w ResponseWriter, r *Request, name string, redirect bool) {
|
||||
} else {
|
||||
// read first chunk to decide between utf-8 text and binary
|
||||
var buf [1024]byte
|
||||
n, _ := io.ReadFull(f, buf[0:])
|
||||
b := buf[0:n]
|
||||
n, _ := io.ReadFull(f, buf[:])
|
||||
b := buf[:n]
|
||||
if isText(b) {
|
||||
w.SetHeader("Content-Type", "text-plain; charset=utf-8")
|
||||
} else {
|
||||
w.SetHeader("Content-Type", "application/octet-stream") // generic binary
|
||||
}
|
||||
w.Write(b)
|
||||
f.Seek(0, 0) // rewind to output whole file
|
||||
}
|
||||
io.Copy(w, f)
|
||||
|
||||
// handle Content-Range header.
|
||||
// TODO(adg): handle multiple ranges
|
||||
ranges, err := parseRange(r.Header["Range"], size)
|
||||
if err != nil || len(ranges) > 1 {
|
||||
Error(w, err.String(), StatusRequestedRangeNotSatisfiable)
|
||||
return
|
||||
}
|
||||
if len(ranges) == 1 {
|
||||
ra := ranges[0]
|
||||
if _, err := f.Seek(ra.start, 0); err != nil {
|
||||
Error(w, err.String(), StatusRequestedRangeNotSatisfiable)
|
||||
return
|
||||
}
|
||||
size = ra.length
|
||||
code = StatusPartialContent
|
||||
w.SetHeader("Content-Range", fmt.Sprintf("%d-%d/%d", ra.start, ra.start+ra.length, d.Size))
|
||||
}
|
||||
|
||||
w.SetHeader("Accept-Ranges", "bytes")
|
||||
w.SetHeader("Content-Length", strconv.Itoa64(size))
|
||||
|
||||
w.WriteHeader(code)
|
||||
|
||||
io.Copyn(w, f, size)
|
||||
}
|
||||
|
||||
// ServeFile replies to the request with the contents of the named file or directory.
|
||||
@ -174,3 +202,62 @@ func (f *fileHandler) ServeHTTP(w ResponseWriter, r *Request) {
|
||||
path = path[len(f.prefix):]
|
||||
serveFile(w, r, f.root+"/"+path, true)
|
||||
}
|
||||
|
||||
// httpRange specifies the byte range to be sent to the client.
|
||||
type httpRange struct {
|
||||
start, length int64
|
||||
}
|
||||
|
||||
// parseRange parses a Range header string as per RFC 2616.
|
||||
func parseRange(s string, size int64) ([]httpRange, os.Error) {
|
||||
if s == "" {
|
||||
return nil, nil // header not present
|
||||
}
|
||||
const b = "bytes="
|
||||
if !strings.HasPrefix(s, b) {
|
||||
return nil, os.NewError("invalid range")
|
||||
}
|
||||
var ranges []httpRange
|
||||
for _, ra := range strings.Split(s[len(b):], ",", -1) {
|
||||
i := strings.Index(ra, "-")
|
||||
if i < 0 {
|
||||
return nil, os.NewError("invalid range")
|
||||
}
|
||||
start, end := ra[:i], ra[i+1:]
|
||||
var r httpRange
|
||||
if start == "" {
|
||||
// If no start is specified, end specifies the
|
||||
// range start relative to the end of the file.
|
||||
i, err := strconv.Atoi64(end)
|
||||
if err != nil {
|
||||
return nil, os.NewError("invalid range")
|
||||
}
|
||||
if i > size {
|
||||
i = size
|
||||
}
|
||||
r.start = size - i
|
||||
r.length = size - r.start
|
||||
} else {
|
||||
i, err := strconv.Atoi64(start)
|
||||
if err != nil || i > size || i < 0 {
|
||||
return nil, os.NewError("invalid range")
|
||||
}
|
||||
r.start = i
|
||||
if end == "" {
|
||||
// If no end is specified, range extends to end of the file.
|
||||
r.length = size - r.start
|
||||
} else {
|
||||
i, err := strconv.Atoi64(end)
|
||||
if err != nil || r.start > i {
|
||||
return nil, os.NewError("invalid range")
|
||||
}
|
||||
if i >= size {
|
||||
i = size - 1
|
||||
}
|
||||
r.length = i - r.start + 1
|
||||
}
|
||||
}
|
||||
ranges = append(ranges, r)
|
||||
}
|
||||
return ranges, nil
|
||||
}
|
||||
|
172
src/pkg/http/fs_test.go
Normal file
172
src/pkg/http/fs_test.go
Normal file
@ -0,0 +1,172 @@
|
||||
// Copyright 2010 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
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"io/ioutil"
|
||||
"net"
|
||||
"os"
|
||||
"sync"
|
||||
"testing"
|
||||
)
|
||||
|
||||
var ParseRangeTests = []struct {
|
||||
s string
|
||||
length int64
|
||||
r []httpRange
|
||||
}{
|
||||
{"", 0, nil},
|
||||
{"foo", 0, nil},
|
||||
{"bytes=", 0, nil},
|
||||
{"bytes=5-4", 10, nil},
|
||||
{"bytes=0-2,5-4", 10, nil},
|
||||
{"bytes=0-9", 10, []httpRange{{0, 10}}},
|
||||
{"bytes=0-", 10, []httpRange{{0, 10}}},
|
||||
{"bytes=5-", 10, []httpRange{{5, 5}}},
|
||||
{"bytes=0-20", 10, []httpRange{{0, 10}}},
|
||||
{"bytes=15-,0-5", 10, nil},
|
||||
{"bytes=-5", 10, []httpRange{{5, 5}}},
|
||||
{"bytes=-15", 10, []httpRange{{0, 10}}},
|
||||
{"bytes=0-499", 10000, []httpRange{{0, 500}}},
|
||||
{"bytes=500-999", 10000, []httpRange{{500, 500}}},
|
||||
{"bytes=-500", 10000, []httpRange{{9500, 500}}},
|
||||
{"bytes=9500-", 10000, []httpRange{{9500, 500}}},
|
||||
{"bytes=0-0,-1", 10000, []httpRange{{0, 1}, {9999, 1}}},
|
||||
{"bytes=500-600,601-999", 10000, []httpRange{{500, 101}, {601, 399}}},
|
||||
{"bytes=500-700,601-999", 10000, []httpRange{{500, 201}, {601, 399}}},
|
||||
}
|
||||
|
||||
func TestParseRange(t *testing.T) {
|
||||
for _, test := range ParseRangeTests {
|
||||
r := test.r
|
||||
ranges, err := parseRange(test.s, test.length)
|
||||
if err != nil && r != nil {
|
||||
t.Errorf("parseRange(%q) returned error %q", test.s, err)
|
||||
}
|
||||
if len(ranges) != len(r) {
|
||||
t.Errorf("len(parseRange(%q)) = %d, want %d", test.s, len(ranges), len(r))
|
||||
continue
|
||||
}
|
||||
for i := range r {
|
||||
if ranges[i].start != r[i].start {
|
||||
t.Errorf("parseRange(%q)[%d].start = %d, want %d", test.s, i, ranges[i].start, r[i].start)
|
||||
}
|
||||
if ranges[i].length != r[i].length {
|
||||
t.Errorf("parseRange(%q)[%d].length = %d, want %d", test.s, i, ranges[i].length, r[i].length)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
const (
|
||||
testFile = "testdata/file"
|
||||
testFileLength = 11
|
||||
)
|
||||
|
||||
var (
|
||||
serverOnce sync.Once
|
||||
serverAddr string
|
||||
)
|
||||
|
||||
func startServer(t *testing.T) {
|
||||
serverOnce.Do(func() {
|
||||
HandleFunc("/ServeFile", func(w ResponseWriter, r *Request) {
|
||||
ServeFile(w, r, "testdata/file")
|
||||
})
|
||||
l, err := net.Listen("tcp", "127.0.0.1:0")
|
||||
if err != nil {
|
||||
t.Fatal("listen:", err)
|
||||
}
|
||||
serverAddr = l.Addr().String()
|
||||
go Serve(l, nil)
|
||||
})
|
||||
}
|
||||
|
||||
var ServeFileRangeTests = []struct {
|
||||
start, end int
|
||||
r string
|
||||
code int
|
||||
}{
|
||||
{0, testFileLength, "", StatusOK},
|
||||
{0, 5, "0-4", StatusPartialContent},
|
||||
{2, testFileLength, "2-", StatusPartialContent},
|
||||
{testFileLength - 5, testFileLength, "-5", StatusPartialContent},
|
||||
{3, 8, "3-7", StatusPartialContent},
|
||||
{0, 0, "20-", StatusRequestedRangeNotSatisfiable},
|
||||
}
|
||||
|
||||
func TestServeFile(t *testing.T) {
|
||||
startServer(t)
|
||||
var err os.Error
|
||||
|
||||
file, err := ioutil.ReadFile(testFile)
|
||||
if err != nil {
|
||||
t.Fatal("reading file:", err)
|
||||
}
|
||||
|
||||
// set up the Request (re-used for all tests)
|
||||
var req Request
|
||||
req.Header = make(map[string]string)
|
||||
if req.URL, err = ParseURL("http://" + serverAddr + "/ServeFile"); err != nil {
|
||||
t.Fatal("ParseURL:", err)
|
||||
}
|
||||
req.Method = "GET"
|
||||
|
||||
// straight GET
|
||||
_, body := getBody(t, req)
|
||||
if !equal(body, file) {
|
||||
t.Fatalf("body mismatch: got %q, want %q", body, file)
|
||||
}
|
||||
|
||||
// Range tests
|
||||
for _, rt := range ServeFileRangeTests {
|
||||
req.Header["Range"] = "bytes=" + rt.r
|
||||
if rt.r == "" {
|
||||
req.Header["Range"] = ""
|
||||
}
|
||||
r, body := getBody(t, req)
|
||||
if r.StatusCode != rt.code {
|
||||
t.Errorf("range=%q: StatusCode=%d, want %d", rt.r, r.StatusCode, rt.code)
|
||||
}
|
||||
if rt.code == StatusRequestedRangeNotSatisfiable {
|
||||
continue
|
||||
}
|
||||
h := fmt.Sprintf("%d-%d/%d", rt.start, rt.end, testFileLength)
|
||||
if rt.r == "" {
|
||||
h = ""
|
||||
}
|
||||
if r.Header["Content-Range"] != h {
|
||||
t.Errorf("header mismatch: range=%q: got %q, want %q", rt.r, r.Header["Content-Range"], h)
|
||||
}
|
||||
if !equal(body, file[rt.start:rt.end]) {
|
||||
t.Errorf("body mismatch: range=%q: got %q, want %q", rt.r, body, file[rt.start:rt.end])
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func getBody(t *testing.T, req Request) (*Response, []byte) {
|
||||
r, err := send(&req)
|
||||
if err != nil {
|
||||
t.Fatal(req.URL.String(), "send:", err)
|
||||
}
|
||||
b, err := ioutil.ReadAll(r.Body)
|
||||
if err != nil {
|
||||
t.Fatal("reading Body:", err)
|
||||
}
|
||||
return r, b
|
||||
}
|
||||
|
||||
func equal(a, b []byte) bool {
|
||||
if len(a) != len(b) {
|
||||
return false
|
||||
}
|
||||
for i := range a {
|
||||
if a[i] != b[i] {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
1
src/pkg/http/testdata/file
vendored
Normal file
1
src/pkg/http/testdata/file
vendored
Normal file
@ -0,0 +1 @@
|
||||
0123456789
|
Loading…
Reference in New Issue
Block a user