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webdav: sharepoint recursion with different depth - fixes #2426

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this change adds the depth parameter to listAll and readMetaDataForPath.
this allows recursive calls of these methods with a different depth
header.

Sharepoint won't list files if the depth header is != 0. If that is the
case, it will just return a error 404 although the file exists.
Since it is not possible to determine if a path should be a file or a
directory, rclone has to make a request with depth = 1 first. On success
we are sure that the path is a directory and the listing will work.
If this request returns error 404, the path either doesn't exist or it
is a file.

To be sure, we can try again with depth set to 0. If it still fails, the
path really doesn't exist, else we found our file.
This commit is contained in:
Henning 2018-08-04 12:02:47 +02:00 committed by Nick Craig-Wood
parent f9eb9c894d
commit 1f3778dbfb
1 changed files with 33 additions and 19 deletions
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52
backend/webdav/webdav.go
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@ -46,7 +46,8 @@ import (
const (
minSleep = 10 * time.Millisecond
maxSleep = 2 * time.Second
decayConstant = 2 // bigger for slower decay, exponential
decayConstant = 2 // bigger for slower decay, exponential
defaultDepth = "1" // depth for PROPFIND
)
// Register with Fs
@ -103,17 +104,18 @@ type Options struct {
// Fs represents a remote webdav
type Fs struct {
name string // name of this remote
root string // the path we are working on
opt Options // parsed options
features *fs.Features // optional features
endpoint *url.URL // URL of the host
endpointURL string // endpoint as a string
srv *rest.Client // the connection to the one drive server
pacer *pacer.Pacer // pacer for API calls
precision time.Duration // mod time precision
canStream bool // set if can stream
useOCMtime bool // set if can use X-OC-Mtime
name string // name of this remote
root string // the path we are working on
opt Options // parsed options
features *fs.Features // optional features
endpoint *url.URL // URL of the host
endpointURL string // endpoint as a string
srv *rest.Client // the connection to the one drive server
pacer *pacer.Pacer // pacer for API calls
precision time.Duration // mod time precision
canStream bool // set if can stream
useOCMtime bool // set if can use X-OC-Mtime
retryWithZeroDepth bool // some vendors (sharepoint) won't list files when Depth is 1 (our default)
}
// Object describes a webdav object
@ -182,13 +184,13 @@ func itemIsDir(item *api.Response) bool {
}
// readMetaDataForPath reads the metadata from the path
func (f *Fs) readMetaDataForPath(path string) (info *api.Prop, err error) {
func (f *Fs) readMetaDataForPath(path string, depth string) (info *api.Prop, err error) {
// FIXME how do we read back additional properties?
opts := rest.Opts{
Method: "PROPFIND",
Path: f.filePath(path),
ExtraHeaders: map[string]string{
"Depth": "1",
"Depth": depth,
},
NoRedirect: true,
}
@ -202,6 +204,9 @@ func (f *Fs) readMetaDataForPath(path string) (info *api.Prop, err error) {
// does not exist
switch apiErr.StatusCode {
case http.StatusNotFound:
if f.retryWithZeroDepth && depth != "0" {
return f.readMetaDataForPath(path, "0")
}
return nil, fs.ErrorObjectNotFound
case http.StatusMovedPermanently, http.StatusFound, http.StatusSeeOther:
// Some sort of redirect - go doesn't deal with these properly (it resets
@ -368,6 +373,12 @@ func (f *Fs) setQuirks(vendor string) error {
return err
}
f.srv.SetCookie(&spCookies.FedAuth, &spCookies.RtFa)
// sharepoint, unlike the other vendors, only lists files if the depth header is set to 0
// however, rclone defaults to 1 since it provides recursive directory listing
// to determine if we may have found a file, the request has to be resent
// with the depth set to 0
f.retryWithZeroDepth = true
case "other":
default:
fs.Debugf(f, "Unknown vendor %q", vendor)
@ -418,12 +429,12 @@ type listAllFn func(string, bool, *api.Prop) bool
// Lists the directory required calling the user function on each item found
//
// If the user fn ever returns true then it early exits with found = true
func (f *Fs) listAll(dir string, directoriesOnly bool, filesOnly bool, fn listAllFn) (found bool, err error) {
func (f *Fs) listAll(dir string, directoriesOnly bool, filesOnly bool, depth string, fn listAllFn) (found bool, err error) {
opts := rest.Opts{
Method: "PROPFIND",
Path: f.dirPath(dir), // FIXME Should not start with /
ExtraHeaders: map[string]string{
"Depth": "1",
"Depth": depth,
},
}
var result api.Multistatus
@ -436,6 +447,9 @@ func (f *Fs) listAll(dir string, directoriesOnly bool, filesOnly bool, fn listAl
if apiErr, ok := err.(*api.Error); ok {
// does not exist
if apiErr.StatusCode == http.StatusNotFound {
if f.retryWithZeroDepth && depth != "0" {
return f.listAll(dir, directoriesOnly, filesOnly, "0", fn)
}
return found, fs.ErrorDirNotFound
}
}
@ -509,7 +523,7 @@ func (f *Fs) listAll(dir string, directoriesOnly bool, filesOnly bool, fn listAl
// found.
func (f *Fs) List(dir string) (entries fs.DirEntries, err error) {
var iErr error
_, err = f.listAll(dir, false, false, func(remote string, isDir bool, info *api.Prop) bool {
_, err = f.listAll(dir, false, false, defaultDepth, func(remote string, isDir bool, info *api.Prop) bool {
if isDir {
d := fs.NewDir(remote, time.Time(info.Modified))
// .SetID(info.ID)
@ -625,7 +639,7 @@ func (f *Fs) Mkdir(dir string) error {
//
// if the directory does not exist then err will be ErrorDirNotFound
func (f *Fs) dirNotEmpty(dir string) (found bool, err error) {
return f.listAll(dir, false, false, func(remote string, isDir bool, info *api.Prop) bool {
return f.listAll(dir, false, false, defaultDepth, func(remote string, isDir bool, info *api.Prop) bool {
return true
})
}
@ -876,7 +890,7 @@ func (o *Object) readMetaData() (err error) {
if o.hasMetaData {
return nil
}
info, err := o.fs.readMetaDataForPath(o.remote)
info, err := o.fs.readMetaDataForPath(o.remote, defaultDepth)
if err != nil {
return err
}