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publicfile.go
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publicfile.go
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// Copyright 2018-2020 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package ocdav
import (
"net/http"
"path"
provider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
"github.com/cs3org/reva/pkg/appctx"
"github.com/cs3org/reva/pkg/rhttp/router"
"go.opencensus.io/trace"
)
// PublicFileHandler handles trashbin requests
type PublicFileHandler struct {
namespace string
}
func (h *PublicFileHandler) init(ns string) error {
h.namespace = path.Join("/", ns)
return nil
}
// Handler handles requests
func (h *PublicFileHandler) Handler(s *svc) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log := appctx.GetLogger(r.Context())
_, relativePath := router.ShiftPath(r.URL.Path)
log.Debug().Str("relativePath", relativePath).Msg("PublicFileHandler func")
if relativePath != "" && relativePath != "/" {
// accessing the file
// PROPFIND has an implicit call
if r.Method != "PROPFIND" && !s.adjustResourcePathInURL(w, r) {
return
}
r.URL.Path = path.Base(r.URL.Path)
switch r.Method {
case "PROPFIND":
s.handlePropfindOnToken(w, r, h.namespace, false)
case http.MethodGet:
s.handleGet(w, r, h.namespace)
case http.MethodOptions:
s.handleOptions(w, r, h.namespace)
case http.MethodHead:
s.handleHead(w, r, h.namespace)
case http.MethodPut:
s.handlePut(w, r, h.namespace)
default:
w.WriteHeader(http.StatusMethodNotAllowed)
}
} else {
// accessing the virtual parent folder
switch r.Method {
case "PROPFIND":
s.handlePropfindOnToken(w, r, h.namespace, true)
case http.MethodOptions:
s.handleOptions(w, r, h.namespace)
case http.MethodHead:
s.handleHead(w, r, h.namespace)
default:
w.WriteHeader(http.StatusMethodNotAllowed)
}
}
})
}
func (s *svc) adjustResourcePathInURL(w http.ResponseWriter, r *http.Request) bool {
ctx := r.Context()
// find actual file name
log := appctx.GetLogger(ctx)
tokenStatInfo := ctx.Value(tokenStatInfoKey{}).(*provider.ResourceInfo)
client, err := s.getClient()
if err != nil {
log.Error().Err(err).Msg("error getting grpc client")
w.WriteHeader(http.StatusInternalServerError)
return false
}
pathRes, err := client.GetPath(ctx, &provider.GetPathRequest{
ResourceId: tokenStatInfo.GetId(),
})
if err != nil {
log.Warn().
Str("tokenStatInfo.Id", tokenStatInfo.GetId().String()).
Str("tokenStatInfo.Path", tokenStatInfo.Path).
Msg("Could not get path of resource")
w.WriteHeader(http.StatusNotFound)
return false
}
if path.Base(r.URL.Path) != path.Base(pathRes.Path) {
w.WriteHeader(http.StatusNotFound)
return false
}
// adjust path in request URL to point at the parent
r.URL.Path = path.Dir(r.URL.Path)
return true
}
// ns is the namespace that is prefixed to the path in the cs3 namespace
func (s *svc) handlePropfindOnToken(w http.ResponseWriter, r *http.Request, ns string, onContainer bool) {
ctx := r.Context()
ctx, span := trace.StartSpan(ctx, "propfind")
defer span.End()
log := appctx.GetLogger(ctx)
tokenStatInfo := ctx.Value(tokenStatInfoKey{}).(*provider.ResourceInfo)
log.Debug().Interface("tokenStatInfo", tokenStatInfo).Msg("handlePropfindOnToken")
depth := r.Header.Get("Depth")
if depth == "" {
depth = "1"
}
// see https://tools.ietf.org/html/rfc4918#section-10.2
if depth != "0" && depth != "1" && depth != "infinity" {
log.Error().Msgf("invalid Depth header value %s", depth)
w.WriteHeader(http.StatusBadRequest)
return
}
pf, status, err := readPropfind(r.Body)
if err != nil {
log.Error().Err(err).Msg("error reading propfind request")
w.WriteHeader(status)
return
}
client, err := s.getClient()
if err != nil {
log.Error().Err(err).Msg("error getting grpc client")
w.WriteHeader(http.StatusInternalServerError)
return
}
// find actual file name
pathRes, err := client.GetPath(ctx, &provider.GetPathRequest{
ResourceId: tokenStatInfo.GetId(),
})
if err != nil {
log.Warn().
Str("tokenStatInfo.Id", tokenStatInfo.GetId().String()).
Str("tokenStatInfo.Path", tokenStatInfo.Path).
Msg("Could not get path of resource")
w.WriteHeader(http.StatusNotFound)
return
}
infos := []*provider.ResourceInfo{}
if onContainer {
// TODO: filter out metadata like favorite and arbitrary metadata
if depth != "0" {
// if the request is to a public link, we need to add yet another value for the file entry.
infos = append(infos, &provider.ResourceInfo{
// append the shared as a container. Annex to OC10 standards.
Id: tokenStatInfo.Id,
Path: tokenStatInfo.Path,
Type: provider.ResourceType_RESOURCE_TYPE_CONTAINER,
Mtime: tokenStatInfo.Mtime,
Size: tokenStatInfo.Size,
Etag: tokenStatInfo.Etag,
PermissionSet: tokenStatInfo.PermissionSet,
})
}
} else if path.Base(r.URL.Path) != path.Base(pathRes.Path) {
// if queried on the wrong path, return not found
w.WriteHeader(http.StatusNotFound)
return
}
infos = append(infos, &provider.ResourceInfo{
Id: tokenStatInfo.Id,
Path: path.Join("/", tokenStatInfo.Path, path.Base(pathRes.Path)),
Type: tokenStatInfo.Type,
Size: tokenStatInfo.Size,
MimeType: tokenStatInfo.MimeType,
Mtime: tokenStatInfo.Mtime,
Etag: tokenStatInfo.Etag,
PermissionSet: tokenStatInfo.PermissionSet,
})
propRes, err := s.formatPropfind(ctx, &pf, infos, ns)
if err != nil {
log.Error().Err(err).Msg("error formatting propfind")
w.WriteHeader(http.StatusInternalServerError)
return
}
w.Header().Set("DAV", "1, 3, extended-mkcol")
w.Header().Set("Content-Type", "application/xml; charset=utf-8")
w.WriteHeader(http.StatusMultiStatus)
if _, err := w.Write([]byte(propRes)); err != nil {
log.Err(err).Msg("error writing response")
}
}