forked from TrueCloudLab/restic
702 lines
20 KiB
Go
702 lines
20 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package webdav provides a WebDAV server implementation.
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package webdav // import "golang.org/x/net/webdav"
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import (
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"os"
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"path"
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"strings"
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"time"
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)
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type Handler struct {
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// Prefix is the URL path prefix to strip from WebDAV resource paths.
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Prefix string
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// FileSystem is the virtual file system.
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FileSystem FileSystem
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// LockSystem is the lock management system.
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LockSystem LockSystem
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// Logger is an optional error logger. If non-nil, it will be called
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// for all HTTP requests.
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Logger func(*http.Request, error)
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}
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func (h *Handler) stripPrefix(p string) (string, int, error) {
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if h.Prefix == "" {
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return p, http.StatusOK, nil
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}
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if r := strings.TrimPrefix(p, h.Prefix); len(r) < len(p) {
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return r, http.StatusOK, nil
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}
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return p, http.StatusNotFound, errPrefixMismatch
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}
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func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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status, err := http.StatusBadRequest, errUnsupportedMethod
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if h.FileSystem == nil {
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status, err = http.StatusInternalServerError, errNoFileSystem
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} else if h.LockSystem == nil {
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status, err = http.StatusInternalServerError, errNoLockSystem
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} else {
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switch r.Method {
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case "OPTIONS":
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status, err = h.handleOptions(w, r)
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case "GET", "HEAD", "POST":
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status, err = h.handleGetHeadPost(w, r)
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case "DELETE":
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status, err = h.handleDelete(w, r)
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case "PUT":
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status, err = h.handlePut(w, r)
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case "MKCOL":
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status, err = h.handleMkcol(w, r)
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case "COPY", "MOVE":
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status, err = h.handleCopyMove(w, r)
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case "LOCK":
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status, err = h.handleLock(w, r)
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case "UNLOCK":
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status, err = h.handleUnlock(w, r)
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case "PROPFIND":
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status, err = h.handlePropfind(w, r)
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case "PROPPATCH":
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status, err = h.handleProppatch(w, r)
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}
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}
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if status != 0 {
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w.WriteHeader(status)
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if status != http.StatusNoContent {
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w.Write([]byte(StatusText(status)))
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}
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}
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if h.Logger != nil {
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h.Logger(r, err)
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}
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}
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func (h *Handler) lock(now time.Time, root string) (token string, status int, err error) {
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token, err = h.LockSystem.Create(now, LockDetails{
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Root: root,
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Duration: infiniteTimeout,
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ZeroDepth: true,
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})
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if err != nil {
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if err == ErrLocked {
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return "", StatusLocked, err
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}
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return "", http.StatusInternalServerError, err
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}
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return token, 0, nil
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}
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func (h *Handler) confirmLocks(r *http.Request, src, dst string) (release func(), status int, err error) {
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hdr := r.Header.Get("If")
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if hdr == "" {
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// An empty If header means that the client hasn't previously created locks.
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// Even if this client doesn't care about locks, we still need to check that
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// the resources aren't locked by another client, so we create temporary
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// locks that would conflict with another client's locks. These temporary
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// locks are unlocked at the end of the HTTP request.
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now, srcToken, dstToken := time.Now(), "", ""
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if src != "" {
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srcToken, status, err = h.lock(now, src)
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if err != nil {
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return nil, status, err
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}
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}
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if dst != "" {
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dstToken, status, err = h.lock(now, dst)
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if err != nil {
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if srcToken != "" {
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h.LockSystem.Unlock(now, srcToken)
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}
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return nil, status, err
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}
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}
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return func() {
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if dstToken != "" {
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h.LockSystem.Unlock(now, dstToken)
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}
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if srcToken != "" {
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h.LockSystem.Unlock(now, srcToken)
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}
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}, 0, nil
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}
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ih, ok := parseIfHeader(hdr)
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if !ok {
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return nil, http.StatusBadRequest, errInvalidIfHeader
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}
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// ih is a disjunction (OR) of ifLists, so any ifList will do.
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for _, l := range ih.lists {
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lsrc := l.resourceTag
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if lsrc == "" {
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lsrc = src
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} else {
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u, err := url.Parse(lsrc)
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if err != nil {
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continue
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}
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if u.Host != r.Host {
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continue
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}
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lsrc, status, err = h.stripPrefix(u.Path)
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if err != nil {
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return nil, status, err
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}
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}
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release, err = h.LockSystem.Confirm(time.Now(), lsrc, dst, l.conditions...)
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if err == ErrConfirmationFailed {
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continue
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}
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if err != nil {
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return nil, http.StatusInternalServerError, err
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}
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return release, 0, nil
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}
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// Section 10.4.1 says that "If this header is evaluated and all state lists
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// fail, then the request must fail with a 412 (Precondition Failed) status."
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// We follow the spec even though the cond_put_corrupt_token test case from
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// the litmus test warns on seeing a 412 instead of a 423 (Locked).
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return nil, http.StatusPreconditionFailed, ErrLocked
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}
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func (h *Handler) handleOptions(w http.ResponseWriter, r *http.Request) (status int, err error) {
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reqPath, status, err := h.stripPrefix(r.URL.Path)
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if err != nil {
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return status, err
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}
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ctx := getContext(r)
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allow := "OPTIONS, LOCK, PUT, MKCOL"
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if fi, err := h.FileSystem.Stat(ctx, reqPath); err == nil {
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if fi.IsDir() {
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allow = "OPTIONS, LOCK, DELETE, PROPPATCH, COPY, MOVE, UNLOCK, PROPFIND"
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} else {
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allow = "OPTIONS, LOCK, GET, HEAD, POST, DELETE, PROPPATCH, COPY, MOVE, UNLOCK, PROPFIND, PUT"
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}
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}
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w.Header().Set("Allow", allow)
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// http://www.webdav.org/specs/rfc4918.html#dav.compliance.classes
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w.Header().Set("DAV", "1, 2")
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// http://msdn.microsoft.com/en-au/library/cc250217.aspx
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w.Header().Set("MS-Author-Via", "DAV")
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return 0, nil
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}
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func (h *Handler) handleGetHeadPost(w http.ResponseWriter, r *http.Request) (status int, err error) {
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reqPath, status, err := h.stripPrefix(r.URL.Path)
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if err != nil {
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return status, err
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}
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// TODO: check locks for read-only access??
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ctx := getContext(r)
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f, err := h.FileSystem.OpenFile(ctx, reqPath, os.O_RDONLY, 0)
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if err != nil {
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return http.StatusNotFound, err
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}
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defer f.Close()
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fi, err := f.Stat()
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if err != nil {
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return http.StatusNotFound, err
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}
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if fi.IsDir() {
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return http.StatusMethodNotAllowed, nil
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}
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etag, err := findETag(ctx, h.FileSystem, h.LockSystem, reqPath, fi)
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if err != nil {
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return http.StatusInternalServerError, err
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}
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w.Header().Set("ETag", etag)
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// Let ServeContent determine the Content-Type header.
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http.ServeContent(w, r, reqPath, fi.ModTime(), f)
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return 0, nil
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}
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func (h *Handler) handleDelete(w http.ResponseWriter, r *http.Request) (status int, err error) {
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reqPath, status, err := h.stripPrefix(r.URL.Path)
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if err != nil {
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return status, err
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}
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release, status, err := h.confirmLocks(r, reqPath, "")
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if err != nil {
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return status, err
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}
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defer release()
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ctx := getContext(r)
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// TODO: return MultiStatus where appropriate.
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// "godoc os RemoveAll" says that "If the path does not exist, RemoveAll
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// returns nil (no error)." WebDAV semantics are that it should return a
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// "404 Not Found". We therefore have to Stat before we RemoveAll.
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if _, err := h.FileSystem.Stat(ctx, reqPath); err != nil {
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if os.IsNotExist(err) {
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return http.StatusNotFound, err
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}
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return http.StatusMethodNotAllowed, err
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}
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if err := h.FileSystem.RemoveAll(ctx, reqPath); err != nil {
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return http.StatusMethodNotAllowed, err
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}
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return http.StatusNoContent, nil
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}
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func (h *Handler) handlePut(w http.ResponseWriter, r *http.Request) (status int, err error) {
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reqPath, status, err := h.stripPrefix(r.URL.Path)
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if err != nil {
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return status, err
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}
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release, status, err := h.confirmLocks(r, reqPath, "")
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if err != nil {
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return status, err
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}
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defer release()
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// TODO(rost): Support the If-Match, If-None-Match headers? See bradfitz'
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// comments in http.checkEtag.
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ctx := getContext(r)
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f, err := h.FileSystem.OpenFile(ctx, reqPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
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if err != nil {
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return http.StatusNotFound, err
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}
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_, copyErr := io.Copy(f, r.Body)
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fi, statErr := f.Stat()
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closeErr := f.Close()
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// TODO(rost): Returning 405 Method Not Allowed might not be appropriate.
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if copyErr != nil {
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return http.StatusMethodNotAllowed, copyErr
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}
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if statErr != nil {
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return http.StatusMethodNotAllowed, statErr
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}
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if closeErr != nil {
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return http.StatusMethodNotAllowed, closeErr
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}
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etag, err := findETag(ctx, h.FileSystem, h.LockSystem, reqPath, fi)
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if err != nil {
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return http.StatusInternalServerError, err
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}
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w.Header().Set("ETag", etag)
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return http.StatusCreated, nil
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}
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func (h *Handler) handleMkcol(w http.ResponseWriter, r *http.Request) (status int, err error) {
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reqPath, status, err := h.stripPrefix(r.URL.Path)
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if err != nil {
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return status, err
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}
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release, status, err := h.confirmLocks(r, reqPath, "")
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if err != nil {
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return status, err
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}
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defer release()
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ctx := getContext(r)
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if r.ContentLength > 0 {
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return http.StatusUnsupportedMediaType, nil
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}
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if err := h.FileSystem.Mkdir(ctx, reqPath, 0777); err != nil {
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if os.IsNotExist(err) {
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return http.StatusConflict, err
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}
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return http.StatusMethodNotAllowed, err
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}
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return http.StatusCreated, nil
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}
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func (h *Handler) handleCopyMove(w http.ResponseWriter, r *http.Request) (status int, err error) {
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hdr := r.Header.Get("Destination")
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if hdr == "" {
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return http.StatusBadRequest, errInvalidDestination
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}
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u, err := url.Parse(hdr)
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if err != nil {
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return http.StatusBadRequest, errInvalidDestination
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}
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if u.Host != r.Host {
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return http.StatusBadGateway, errInvalidDestination
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}
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src, status, err := h.stripPrefix(r.URL.Path)
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if err != nil {
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return status, err
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}
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dst, status, err := h.stripPrefix(u.Path)
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if err != nil {
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return status, err
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}
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if dst == "" {
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return http.StatusBadGateway, errInvalidDestination
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}
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if dst == src {
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return http.StatusForbidden, errDestinationEqualsSource
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}
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ctx := getContext(r)
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if r.Method == "COPY" {
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// Section 7.5.1 says that a COPY only needs to lock the destination,
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// not both destination and source. Strictly speaking, this is racy,
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// even though a COPY doesn't modify the source, if a concurrent
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// operation modifies the source. However, the litmus test explicitly
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// checks that COPYing a locked-by-another source is OK.
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release, status, err := h.confirmLocks(r, "", dst)
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if err != nil {
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return status, err
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}
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defer release()
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// Section 9.8.3 says that "The COPY method on a collection without a Depth
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// header must act as if a Depth header with value "infinity" was included".
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depth := infiniteDepth
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if hdr := r.Header.Get("Depth"); hdr != "" {
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depth = parseDepth(hdr)
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if depth != 0 && depth != infiniteDepth {
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// Section 9.8.3 says that "A client may submit a Depth header on a
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// COPY on a collection with a value of "0" or "infinity"."
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return http.StatusBadRequest, errInvalidDepth
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}
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}
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return copyFiles(ctx, h.FileSystem, src, dst, r.Header.Get("Overwrite") != "F", depth, 0)
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}
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release, status, err := h.confirmLocks(r, src, dst)
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if err != nil {
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return status, err
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}
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defer release()
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// Section 9.9.2 says that "The MOVE method on a collection must act as if
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// a "Depth: infinity" header was used on it. A client must not submit a
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// Depth header on a MOVE on a collection with any value but "infinity"."
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if hdr := r.Header.Get("Depth"); hdr != "" {
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if parseDepth(hdr) != infiniteDepth {
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return http.StatusBadRequest, errInvalidDepth
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}
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}
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return moveFiles(ctx, h.FileSystem, src, dst, r.Header.Get("Overwrite") == "T")
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}
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func (h *Handler) handleLock(w http.ResponseWriter, r *http.Request) (retStatus int, retErr error) {
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duration, err := parseTimeout(r.Header.Get("Timeout"))
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if err != nil {
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return http.StatusBadRequest, err
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}
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li, status, err := readLockInfo(r.Body)
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if err != nil {
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return status, err
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}
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ctx := getContext(r)
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token, ld, now, created := "", LockDetails{}, time.Now(), false
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if li == (lockInfo{}) {
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// An empty lockInfo means to refresh the lock.
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ih, ok := parseIfHeader(r.Header.Get("If"))
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if !ok {
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return http.StatusBadRequest, errInvalidIfHeader
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}
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if len(ih.lists) == 1 && len(ih.lists[0].conditions) == 1 {
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token = ih.lists[0].conditions[0].Token
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}
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if token == "" {
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return http.StatusBadRequest, errInvalidLockToken
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}
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ld, err = h.LockSystem.Refresh(now, token, duration)
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if err != nil {
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if err == ErrNoSuchLock {
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return http.StatusPreconditionFailed, err
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}
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return http.StatusInternalServerError, err
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}
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} else {
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// Section 9.10.3 says that "If no Depth header is submitted on a LOCK request,
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// then the request MUST act as if a "Depth:infinity" had been submitted."
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depth := infiniteDepth
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if hdr := r.Header.Get("Depth"); hdr != "" {
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depth = parseDepth(hdr)
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if depth != 0 && depth != infiniteDepth {
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// Section 9.10.3 says that "Values other than 0 or infinity must not be
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// used with the Depth header on a LOCK method".
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return http.StatusBadRequest, errInvalidDepth
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}
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}
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reqPath, status, err := h.stripPrefix(r.URL.Path)
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if err != nil {
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return status, err
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}
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ld = LockDetails{
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Root: reqPath,
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Duration: duration,
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OwnerXML: li.Owner.InnerXML,
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ZeroDepth: depth == 0,
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}
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token, err = h.LockSystem.Create(now, ld)
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if err != nil {
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if err == ErrLocked {
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return StatusLocked, err
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}
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return http.StatusInternalServerError, err
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}
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defer func() {
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if retErr != nil {
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h.LockSystem.Unlock(now, token)
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}
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}()
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// Create the resource if it didn't previously exist.
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if _, err := h.FileSystem.Stat(ctx, reqPath); err != nil {
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f, err := h.FileSystem.OpenFile(ctx, reqPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
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if err != nil {
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// TODO: detect missing intermediate dirs and return http.StatusConflict?
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return http.StatusInternalServerError, err
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}
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f.Close()
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created = true
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}
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// http://www.webdav.org/specs/rfc4918.html#HEADER_Lock-Token says that the
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// Lock-Token value is a Coded-URL. We add angle brackets.
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w.Header().Set("Lock-Token", "<"+token+">")
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}
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w.Header().Set("Content-Type", "application/xml; charset=utf-8")
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if created {
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// This is "w.WriteHeader(http.StatusCreated)" and not "return
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// http.StatusCreated, nil" because we write our own (XML) response to w
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// and Handler.ServeHTTP would otherwise write "Created".
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w.WriteHeader(http.StatusCreated)
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}
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writeLockInfo(w, token, ld)
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return 0, nil
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}
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func (h *Handler) handleUnlock(w http.ResponseWriter, r *http.Request) (status int, err error) {
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// http://www.webdav.org/specs/rfc4918.html#HEADER_Lock-Token says that the
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// Lock-Token value is a Coded-URL. We strip its angle brackets.
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t := r.Header.Get("Lock-Token")
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if len(t) < 2 || t[0] != '<' || t[len(t)-1] != '>' {
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return http.StatusBadRequest, errInvalidLockToken
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}
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t = t[1 : len(t)-1]
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switch err = h.LockSystem.Unlock(time.Now(), t); err {
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case nil:
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return http.StatusNoContent, err
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case ErrForbidden:
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return http.StatusForbidden, err
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case ErrLocked:
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return StatusLocked, err
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case ErrNoSuchLock:
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return http.StatusConflict, err
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default:
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return http.StatusInternalServerError, err
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}
|
|
}
|
|
|
|
func (h *Handler) handlePropfind(w http.ResponseWriter, r *http.Request) (status int, err error) {
|
|
reqPath, status, err := h.stripPrefix(r.URL.Path)
|
|
if err != nil {
|
|
return status, err
|
|
}
|
|
ctx := getContext(r)
|
|
fi, err := h.FileSystem.Stat(ctx, reqPath)
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return http.StatusNotFound, err
|
|
}
|
|
return http.StatusMethodNotAllowed, err
|
|
}
|
|
depth := infiniteDepth
|
|
if hdr := r.Header.Get("Depth"); hdr != "" {
|
|
depth = parseDepth(hdr)
|
|
if depth == invalidDepth {
|
|
return http.StatusBadRequest, errInvalidDepth
|
|
}
|
|
}
|
|
pf, status, err := readPropfind(r.Body)
|
|
if err != nil {
|
|
return status, err
|
|
}
|
|
|
|
mw := multistatusWriter{w: w}
|
|
|
|
walkFn := func(reqPath string, info os.FileInfo, err error) error {
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var pstats []Propstat
|
|
if pf.Propname != nil {
|
|
pnames, err := propnames(ctx, h.FileSystem, h.LockSystem, reqPath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
pstat := Propstat{Status: http.StatusOK}
|
|
for _, xmlname := range pnames {
|
|
pstat.Props = append(pstat.Props, Property{XMLName: xmlname})
|
|
}
|
|
pstats = append(pstats, pstat)
|
|
} else if pf.Allprop != nil {
|
|
pstats, err = allprop(ctx, h.FileSystem, h.LockSystem, reqPath, pf.Prop)
|
|
} else {
|
|
pstats, err = props(ctx, h.FileSystem, h.LockSystem, reqPath, pf.Prop)
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return mw.write(makePropstatResponse(path.Join(h.Prefix, reqPath), pstats))
|
|
}
|
|
|
|
walkErr := walkFS(ctx, h.FileSystem, depth, reqPath, fi, walkFn)
|
|
closeErr := mw.close()
|
|
if walkErr != nil {
|
|
return http.StatusInternalServerError, walkErr
|
|
}
|
|
if closeErr != nil {
|
|
return http.StatusInternalServerError, closeErr
|
|
}
|
|
return 0, nil
|
|
}
|
|
|
|
func (h *Handler) handleProppatch(w http.ResponseWriter, r *http.Request) (status int, err error) {
|
|
reqPath, status, err := h.stripPrefix(r.URL.Path)
|
|
if err != nil {
|
|
return status, err
|
|
}
|
|
release, status, err := h.confirmLocks(r, reqPath, "")
|
|
if err != nil {
|
|
return status, err
|
|
}
|
|
defer release()
|
|
|
|
ctx := getContext(r)
|
|
|
|
if _, err := h.FileSystem.Stat(ctx, reqPath); err != nil {
|
|
if os.IsNotExist(err) {
|
|
return http.StatusNotFound, err
|
|
}
|
|
return http.StatusMethodNotAllowed, err
|
|
}
|
|
patches, status, err := readProppatch(r.Body)
|
|
if err != nil {
|
|
return status, err
|
|
}
|
|
pstats, err := patch(ctx, h.FileSystem, h.LockSystem, reqPath, patches)
|
|
if err != nil {
|
|
return http.StatusInternalServerError, err
|
|
}
|
|
mw := multistatusWriter{w: w}
|
|
writeErr := mw.write(makePropstatResponse(r.URL.Path, pstats))
|
|
closeErr := mw.close()
|
|
if writeErr != nil {
|
|
return http.StatusInternalServerError, writeErr
|
|
}
|
|
if closeErr != nil {
|
|
return http.StatusInternalServerError, closeErr
|
|
}
|
|
return 0, nil
|
|
}
|
|
|
|
func makePropstatResponse(href string, pstats []Propstat) *response {
|
|
resp := response{
|
|
Href: []string{(&url.URL{Path: href}).EscapedPath()},
|
|
Propstat: make([]propstat, 0, len(pstats)),
|
|
}
|
|
for _, p := range pstats {
|
|
var xmlErr *xmlError
|
|
if p.XMLError != "" {
|
|
xmlErr = &xmlError{InnerXML: []byte(p.XMLError)}
|
|
}
|
|
resp.Propstat = append(resp.Propstat, propstat{
|
|
Status: fmt.Sprintf("HTTP/1.1 %d %s", p.Status, StatusText(p.Status)),
|
|
Prop: p.Props,
|
|
ResponseDescription: p.ResponseDescription,
|
|
Error: xmlErr,
|
|
})
|
|
}
|
|
return &resp
|
|
}
|
|
|
|
const (
|
|
infiniteDepth = -1
|
|
invalidDepth = -2
|
|
)
|
|
|
|
// parseDepth maps the strings "0", "1" and "infinity" to 0, 1 and
|
|
// infiniteDepth. Parsing any other string returns invalidDepth.
|
|
//
|
|
// Different WebDAV methods have further constraints on valid depths:
|
|
// - PROPFIND has no further restrictions, as per section 9.1.
|
|
// - COPY accepts only "0" or "infinity", as per section 9.8.3.
|
|
// - MOVE accepts only "infinity", as per section 9.9.2.
|
|
// - LOCK accepts only "0" or "infinity", as per section 9.10.3.
|
|
// These constraints are enforced by the handleXxx methods.
|
|
func parseDepth(s string) int {
|
|
switch s {
|
|
case "0":
|
|
return 0
|
|
case "1":
|
|
return 1
|
|
case "infinity":
|
|
return infiniteDepth
|
|
}
|
|
return invalidDepth
|
|
}
|
|
|
|
// http://www.webdav.org/specs/rfc4918.html#status.code.extensions.to.http11
|
|
const (
|
|
StatusMulti = 207
|
|
StatusUnprocessableEntity = 422
|
|
StatusLocked = 423
|
|
StatusFailedDependency = 424
|
|
StatusInsufficientStorage = 507
|
|
)
|
|
|
|
func StatusText(code int) string {
|
|
switch code {
|
|
case StatusMulti:
|
|
return "Multi-Status"
|
|
case StatusUnprocessableEntity:
|
|
return "Unprocessable Entity"
|
|
case StatusLocked:
|
|
return "Locked"
|
|
case StatusFailedDependency:
|
|
return "Failed Dependency"
|
|
case StatusInsufficientStorage:
|
|
return "Insufficient Storage"
|
|
}
|
|
return http.StatusText(code)
|
|
}
|
|
|
|
var (
|
|
errDestinationEqualsSource = errors.New("webdav: destination equals source")
|
|
errDirectoryNotEmpty = errors.New("webdav: directory not empty")
|
|
errInvalidDepth = errors.New("webdav: invalid depth")
|
|
errInvalidDestination = errors.New("webdav: invalid destination")
|
|
errInvalidIfHeader = errors.New("webdav: invalid If header")
|
|
errInvalidLockInfo = errors.New("webdav: invalid lock info")
|
|
errInvalidLockToken = errors.New("webdav: invalid lock token")
|
|
errInvalidPropfind = errors.New("webdav: invalid propfind")
|
|
errInvalidProppatch = errors.New("webdav: invalid proppatch")
|
|
errInvalidResponse = errors.New("webdav: invalid response")
|
|
errInvalidTimeout = errors.New("webdav: invalid timeout")
|
|
errNoFileSystem = errors.New("webdav: no file system")
|
|
errNoLockSystem = errors.New("webdav: no lock system")
|
|
errNotADirectory = errors.New("webdav: not a directory")
|
|
errPrefixMismatch = errors.New("webdav: prefix mismatch")
|
|
errRecursionTooDeep = errors.New("webdav: recursion too deep")
|
|
errUnsupportedLockInfo = errors.New("webdav: unsupported lock info")
|
|
errUnsupportedMethod = errors.New("webdav: unsupported method")
|
|
)
|