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Diffstat (limited to 'src/pkg/net/http/fs.go')
-rw-r--r--src/pkg/net/http/fs.go549
1 files changed, 0 insertions, 549 deletions
diff --git a/src/pkg/net/http/fs.go b/src/pkg/net/http/fs.go
deleted file mode 100644
index 8576cf844..000000000
--- a/src/pkg/net/http/fs.go
+++ /dev/null
@@ -1,549 +0,0 @@
-// Copyright 2009 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.
-
-// HTTP file system request handler
-
-package http
-
-import (
- "errors"
- "fmt"
- "io"
- "mime"
- "mime/multipart"
- "net/textproto"
- "net/url"
- "os"
- "path"
- "path/filepath"
- "strconv"
- "strings"
- "time"
-)
-
-// A Dir implements http.FileSystem using the native file
-// system restricted to a specific directory tree.
-//
-// An empty Dir is treated as ".".
-type Dir string
-
-func (d Dir) Open(name string) (File, error) {
- if filepath.Separator != '/' && strings.IndexRune(name, filepath.Separator) >= 0 ||
- strings.Contains(name, "\x00") {
- return nil, errors.New("http: invalid character in file path")
- }
- dir := string(d)
- if dir == "" {
- dir = "."
- }
- f, err := os.Open(filepath.Join(dir, filepath.FromSlash(path.Clean("/"+name))))
- if err != nil {
- return nil, err
- }
- return f, nil
-}
-
-// A FileSystem implements access to a collection of named files.
-// The elements in a file path are separated by slash ('/', U+002F)
-// characters, regardless of host operating system convention.
-type FileSystem interface {
- Open(name string) (File, error)
-}
-
-// A File is returned by a FileSystem's Open method and can be
-// served by the FileServer implementation.
-//
-// The methods should behave the same as those on an *os.File.
-type File interface {
- io.Closer
- io.Reader
- Readdir(count int) ([]os.FileInfo, error)
- Seek(offset int64, whence int) (int64, error)
- Stat() (os.FileInfo, error)
-}
-
-func dirList(w ResponseWriter, f File) {
- w.Header().Set("Content-Type", "text/html; charset=utf-8")
- fmt.Fprintf(w, "<pre>\n")
- for {
- dirs, err := f.Readdir(100)
- if err != nil || len(dirs) == 0 {
- break
- }
- for _, d := range dirs {
- name := d.Name()
- if d.IsDir() {
- name += "/"
- }
- // name may contain '?' or '#', which must be escaped to remain
- // part of the URL path, and not indicate the start of a query
- // string or fragment.
- url := url.URL{Path: name}
- fmt.Fprintf(w, "<a href=\"%s\">%s</a>\n", url.String(), htmlReplacer.Replace(name))
- }
- }
- fmt.Fprintf(w, "</pre>\n")
-}
-
-// ServeContent replies to the request using the content in the
-// provided ReadSeeker. The main benefit of ServeContent over io.Copy
-// is that it handles Range requests properly, sets the MIME type, and
-// handles If-Modified-Since requests.
-//
-// If the response's Content-Type header is not set, ServeContent
-// first tries to deduce the type from name's file extension and,
-// if that fails, falls back to reading the first block of the content
-// and passing it to DetectContentType.
-// The name is otherwise unused; in particular it can be empty and is
-// never sent in the response.
-//
-// If modtime is not the zero time, ServeContent includes it in a
-// Last-Modified header in the response. If the request includes an
-// If-Modified-Since header, ServeContent uses modtime to decide
-// whether the content needs to be sent at all.
-//
-// The content's Seek method must work: ServeContent uses
-// a seek to the end of the content to determine its size.
-//
-// If the caller has set w's ETag header, ServeContent uses it to
-// handle requests using If-Range and If-None-Match.
-//
-// Note that *os.File implements the io.ReadSeeker interface.
-func ServeContent(w ResponseWriter, req *Request, name string, modtime time.Time, content io.ReadSeeker) {
- sizeFunc := func() (int64, error) {
- size, err := content.Seek(0, os.SEEK_END)
- if err != nil {
- return 0, errSeeker
- }
- _, err = content.Seek(0, os.SEEK_SET)
- if err != nil {
- return 0, errSeeker
- }
- return size, nil
- }
- serveContent(w, req, name, modtime, sizeFunc, content)
-}
-
-// errSeeker is returned by ServeContent's sizeFunc when the content
-// doesn't seek properly. The underlying Seeker's error text isn't
-// included in the sizeFunc reply so it's not sent over HTTP to end
-// users.
-var errSeeker = errors.New("seeker can't seek")
-
-// if name is empty, filename is unknown. (used for mime type, before sniffing)
-// if modtime.IsZero(), modtime is unknown.
-// content must be seeked to the beginning of the file.
-// The sizeFunc is called at most once. Its error, if any, is sent in the HTTP response.
-func serveContent(w ResponseWriter, r *Request, name string, modtime time.Time, sizeFunc func() (int64, error), content io.ReadSeeker) {
- if checkLastModified(w, r, modtime) {
- return
- }
- rangeReq, done := checkETag(w, r)
- if done {
- return
- }
-
- code := StatusOK
-
- // If Content-Type isn't set, use the file's extension to find it, but
- // if the Content-Type is unset explicitly, do not sniff the type.
- ctypes, haveType := w.Header()["Content-Type"]
- var ctype string
- if !haveType {
- ctype = mime.TypeByExtension(filepath.Ext(name))
- if ctype == "" {
- // read a chunk to decide between utf-8 text and binary
- var buf [sniffLen]byte
- n, _ := io.ReadFull(content, buf[:])
- ctype = DetectContentType(buf[:n])
- _, err := content.Seek(0, os.SEEK_SET) // rewind to output whole file
- if err != nil {
- Error(w, "seeker can't seek", StatusInternalServerError)
- return
- }
- }
- w.Header().Set("Content-Type", ctype)
- } else if len(ctypes) > 0 {
- ctype = ctypes[0]
- }
-
- size, err := sizeFunc()
- if err != nil {
- Error(w, err.Error(), StatusInternalServerError)
- return
- }
-
- // handle Content-Range header.
- sendSize := size
- var sendContent io.Reader = content
- if size >= 0 {
- ranges, err := parseRange(rangeReq, size)
- if err != nil {
- Error(w, err.Error(), StatusRequestedRangeNotSatisfiable)
- return
- }
- if sumRangesSize(ranges) > size {
- // The total number of bytes in all the ranges
- // is larger than the size of the file by
- // itself, so this is probably an attack, or a
- // dumb client. Ignore the range request.
- ranges = nil
- }
- switch {
- case len(ranges) == 1:
- // RFC 2616, Section 14.16:
- // "When an HTTP message includes the content of a single
- // range (for example, a response to a request for a
- // single range, or to a request for a set of ranges
- // that overlap without any holes), this content is
- // transmitted with a Content-Range header, and a
- // Content-Length header showing the number of bytes
- // actually transferred.
- // ...
- // A response to a request for a single range MUST NOT
- // be sent using the multipart/byteranges media type."
- ra := ranges[0]
- if _, err := content.Seek(ra.start, os.SEEK_SET); err != nil {
- Error(w, err.Error(), StatusRequestedRangeNotSatisfiable)
- return
- }
- sendSize = ra.length
- code = StatusPartialContent
- w.Header().Set("Content-Range", ra.contentRange(size))
- case len(ranges) > 1:
- for _, ra := range ranges {
- if ra.start > size {
- Error(w, err.Error(), StatusRequestedRangeNotSatisfiable)
- return
- }
- }
- sendSize = rangesMIMESize(ranges, ctype, size)
- code = StatusPartialContent
-
- pr, pw := io.Pipe()
- mw := multipart.NewWriter(pw)
- w.Header().Set("Content-Type", "multipart/byteranges; boundary="+mw.Boundary())
- sendContent = pr
- defer pr.Close() // cause writing goroutine to fail and exit if CopyN doesn't finish.
- go func() {
- for _, ra := range ranges {
- part, err := mw.CreatePart(ra.mimeHeader(ctype, size))
- if err != nil {
- pw.CloseWithError(err)
- return
- }
- if _, err := content.Seek(ra.start, os.SEEK_SET); err != nil {
- pw.CloseWithError(err)
- return
- }
- if _, err := io.CopyN(part, content, ra.length); err != nil {
- pw.CloseWithError(err)
- return
- }
- }
- mw.Close()
- pw.Close()
- }()
- }
-
- w.Header().Set("Accept-Ranges", "bytes")
- if w.Header().Get("Content-Encoding") == "" {
- w.Header().Set("Content-Length", strconv.FormatInt(sendSize, 10))
- }
- }
-
- w.WriteHeader(code)
-
- if r.Method != "HEAD" {
- io.CopyN(w, sendContent, sendSize)
- }
-}
-
-// modtime is the modification time of the resource to be served, or IsZero().
-// return value is whether this request is now complete.
-func checkLastModified(w ResponseWriter, r *Request, modtime time.Time) bool {
- if modtime.IsZero() {
- return false
- }
-
- // The Date-Modified header truncates sub-second precision, so
- // use mtime < t+1s instead of mtime <= t to check for unmodified.
- if t, err := time.Parse(TimeFormat, r.Header.Get("If-Modified-Since")); err == nil && modtime.Before(t.Add(1*time.Second)) {
- h := w.Header()
- delete(h, "Content-Type")
- delete(h, "Content-Length")
- w.WriteHeader(StatusNotModified)
- return true
- }
- w.Header().Set("Last-Modified", modtime.UTC().Format(TimeFormat))
- return false
-}
-
-// checkETag implements If-None-Match and If-Range checks.
-// The ETag must have been previously set in the ResponseWriter's headers.
-//
-// The return value is the effective request "Range" header to use and
-// whether this request is now considered done.
-func checkETag(w ResponseWriter, r *Request) (rangeReq string, done bool) {
- etag := w.Header().get("Etag")
- rangeReq = r.Header.get("Range")
-
- // Invalidate the range request if the entity doesn't match the one
- // the client was expecting.
- // "If-Range: version" means "ignore the Range: header unless version matches the
- // current file."
- // We only support ETag versions.
- // The caller must have set the ETag on the response already.
- if ir := r.Header.get("If-Range"); ir != "" && ir != etag {
- // TODO(bradfitz): handle If-Range requests with Last-Modified
- // times instead of ETags? I'd rather not, at least for
- // now. That seems like a bug/compromise in the RFC 2616, and
- // I've never heard of anybody caring about that (yet).
- rangeReq = ""
- }
-
- if inm := r.Header.get("If-None-Match"); inm != "" {
- // Must know ETag.
- if etag == "" {
- return rangeReq, false
- }
-
- // TODO(bradfitz): non-GET/HEAD requests require more work:
- // sending a different status code on matches, and
- // also can't use weak cache validators (those with a "W/
- // prefix). But most users of ServeContent will be using
- // it on GET or HEAD, so only support those for now.
- if r.Method != "GET" && r.Method != "HEAD" {
- return rangeReq, false
- }
-
- // TODO(bradfitz): deal with comma-separated or multiple-valued
- // list of If-None-match values. For now just handle the common
- // case of a single item.
- if inm == etag || inm == "*" {
- h := w.Header()
- delete(h, "Content-Type")
- delete(h, "Content-Length")
- w.WriteHeader(StatusNotModified)
- return "", true
- }
- }
- return rangeReq, false
-}
-
-// name is '/'-separated, not filepath.Separator.
-func serveFile(w ResponseWriter, r *Request, fs FileSystem, name string, redirect bool) {
- const indexPage = "/index.html"
-
- // redirect .../index.html to .../
- // can't use Redirect() because that would make the path absolute,
- // which would be a problem running under StripPrefix
- if strings.HasSuffix(r.URL.Path, indexPage) {
- localRedirect(w, r, "./")
- return
- }
-
- f, err := fs.Open(name)
- if err != nil {
- // TODO expose actual error?
- NotFound(w, r)
- return
- }
- defer f.Close()
-
- d, err1 := f.Stat()
- if err1 != nil {
- // TODO expose actual error?
- NotFound(w, r)
- return
- }
-
- if redirect {
- // redirect to canonical path: / at end of directory url
- // r.URL.Path always begins with /
- url := r.URL.Path
- if d.IsDir() {
- if url[len(url)-1] != '/' {
- localRedirect(w, r, path.Base(url)+"/")
- return
- }
- } else {
- if url[len(url)-1] == '/' {
- localRedirect(w, r, "../"+path.Base(url))
- return
- }
- }
- }
-
- // use contents of index.html for directory, if present
- if d.IsDir() {
- index := name + indexPage
- ff, err := fs.Open(index)
- if err == nil {
- defer ff.Close()
- dd, err := ff.Stat()
- if err == nil {
- name = index
- d = dd
- f = ff
- }
- }
- }
-
- // Still a directory? (we didn't find an index.html file)
- if d.IsDir() {
- if checkLastModified(w, r, d.ModTime()) {
- return
- }
- dirList(w, f)
- return
- }
-
- // serverContent will check modification time
- sizeFunc := func() (int64, error) { return d.Size(), nil }
- serveContent(w, r, d.Name(), d.ModTime(), sizeFunc, f)
-}
-
-// localRedirect gives a Moved Permanently response.
-// It does not convert relative paths to absolute paths like Redirect does.
-func localRedirect(w ResponseWriter, r *Request, newPath string) {
- if q := r.URL.RawQuery; q != "" {
- newPath += "?" + q
- }
- w.Header().Set("Location", newPath)
- w.WriteHeader(StatusMovedPermanently)
-}
-
-// ServeFile replies to the request with the contents of the named file or directory.
-func ServeFile(w ResponseWriter, r *Request, name string) {
- dir, file := filepath.Split(name)
- serveFile(w, r, Dir(dir), file, false)
-}
-
-type fileHandler struct {
- root FileSystem
-}
-
-// FileServer returns a handler that serves HTTP requests
-// with the contents of the file system rooted at root.
-//
-// To use the operating system's file system implementation,
-// use http.Dir:
-//
-// http.Handle("/", http.FileServer(http.Dir("/tmp")))
-func FileServer(root FileSystem) Handler {
- return &fileHandler{root}
-}
-
-func (f *fileHandler) ServeHTTP(w ResponseWriter, r *Request) {
- upath := r.URL.Path
- if !strings.HasPrefix(upath, "/") {
- upath = "/" + upath
- r.URL.Path = upath
- }
- serveFile(w, r, f.root, path.Clean(upath), true)
-}
-
-// httpRange specifies the byte range to be sent to the client.
-type httpRange struct {
- start, length int64
-}
-
-func (r httpRange) contentRange(size int64) string {
- return fmt.Sprintf("bytes %d-%d/%d", r.start, r.start+r.length-1, size)
-}
-
-func (r httpRange) mimeHeader(contentType string, size int64) textproto.MIMEHeader {
- return textproto.MIMEHeader{
- "Content-Range": {r.contentRange(size)},
- "Content-Type": {contentType},
- }
-}
-
-// parseRange parses a Range header string as per RFC 2616.
-func parseRange(s string, size int64) ([]httpRange, error) {
- if s == "" {
- return nil, nil // header not present
- }
- const b = "bytes="
- if !strings.HasPrefix(s, b) {
- return nil, errors.New("invalid range")
- }
- var ranges []httpRange
- for _, ra := range strings.Split(s[len(b):], ",") {
- ra = strings.TrimSpace(ra)
- if ra == "" {
- continue
- }
- i := strings.Index(ra, "-")
- if i < 0 {
- return nil, errors.New("invalid range")
- }
- start, end := strings.TrimSpace(ra[:i]), strings.TrimSpace(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.ParseInt(end, 10, 64)
- if err != nil {
- return nil, errors.New("invalid range")
- }
- if i > size {
- i = size
- }
- r.start = size - i
- r.length = size - r.start
- } else {
- i, err := strconv.ParseInt(start, 10, 64)
- if err != nil || i > size || i < 0 {
- return nil, errors.New("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.ParseInt(end, 10, 64)
- if err != nil || r.start > i {
- return nil, errors.New("invalid range")
- }
- if i >= size {
- i = size - 1
- }
- r.length = i - r.start + 1
- }
- }
- ranges = append(ranges, r)
- }
- return ranges, nil
-}
-
-// countingWriter counts how many bytes have been written to it.
-type countingWriter int64
-
-func (w *countingWriter) Write(p []byte) (n int, err error) {
- *w += countingWriter(len(p))
- return len(p), nil
-}
-
-// rangesMIMESize returns the number of bytes it takes to encode the
-// provided ranges as a multipart response.
-func rangesMIMESize(ranges []httpRange, contentType string, contentSize int64) (encSize int64) {
- var w countingWriter
- mw := multipart.NewWriter(&w)
- for _, ra := range ranges {
- mw.CreatePart(ra.mimeHeader(contentType, contentSize))
- encSize += ra.length
- }
- mw.Close()
- encSize += int64(w)
- return
-}
-
-func sumRangesSize(ranges []httpRange) (size int64) {
- for _, ra := range ranges {
- size += ra.length
- }
- return
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-29 14:00:54 +0000