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storage_webdav.go
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storage_webdav.go
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/**
* OpenBmclAPI (Golang Edition)
* Copyright (C) 2024 Kevin Z <zyxkad@gmail.com>
* All rights reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"context"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"os"
"path"
"strconv"
"strings"
"github.com/studio-b12/gowebdav"
"gopkg.in/yaml.v3"
"github.com/LiterMC/go-openbmclapi/internal/gosrc"
)
type WebDavStorageOption struct {
MaxConn int `yaml:"max-conn"`
MaxUploadRate int `yaml:"max-upload-rate"`
MaxDownloadRate int `yaml:"max-download-rate"`
PreGenMeasures bool `yaml:"pre-gen-measures"`
FollowRedirect bool `yaml:"follow-redirect"`
RedirectLinkCache YAMLDuration `yaml:"redirect-link-cache"`
Alias string `yaml:"alias,omitempty"`
WebDavUser `yaml:",inline,omitempty"`
aliasUser *WebDavUser
fullEndPoint string
}
var (
_ yaml.Marshaler = (*WebDavStorageOption)(nil)
_ yaml.Unmarshaler = (*WebDavStorageOption)(nil)
)
func (o *WebDavStorageOption) MarshalYAML() (any, error) {
type T WebDavStorageOption
return (*T)(o), nil
}
func (o *WebDavStorageOption) UnmarshalYAML(n *yaml.Node) (err error) {
// set default values
o.MaxConn = 24
o.MaxUploadRate = 0
o.MaxDownloadRate = 0
o.PreGenMeasures = false
o.FollowRedirect = false
o.RedirectLinkCache = 0
o.Alias = ""
type T WebDavStorageOption
if err = n.Decode((*T)(o)); err != nil {
return
}
return
}
func (o *WebDavStorageOption) GetEndPoint() string {
return o.fullEndPoint
}
func (o *WebDavStorageOption) GetUsername() string {
if o.Username != "" {
return o.Username
}
if o.Alias != "" {
// assert o.aliasUser != nil
return o.aliasUser.Username
}
return ""
}
func (o *WebDavStorageOption) GetPassword() string {
if o.Password != "" {
return o.Password
}
if o.Alias != "" {
// assert o.aliasUser != nil
return o.aliasUser.Password
}
return ""
}
type WebDavStorage struct {
opt WebDavStorageOption
cache Cache
cli *gowebdav.Client
limitedDialer *LimitedDialer
httpCli *http.Client
noRedCli *http.Client // no redirect client
}
var _ Storage = (*WebDavStorage)(nil)
func init() {
RegisterStorageFactory(StorageWebdav, StorageFactory{
New: func() Storage { return new(WebDavStorage) },
NewConfig: func() any { return new(WebDavStorageOption) },
})
}
func (s *WebDavStorage) String() string {
return fmt.Sprintf("<WebDavStorage endpoint=%q user=%s>", s.opt.GetEndPoint(), s.opt.GetUsername())
}
func (s *WebDavStorage) Options() any {
return &s.opt
}
func (s *WebDavStorage) SetOptions(newOpts any) {
s.opt = *(newOpts.(*WebDavStorageOption))
}
func webdavIsHTTPError(err error, code int) bool {
expect := fmt.Sprintf("%v %v", code, http.StatusText(code))
return strings.Contains(err.Error(), expect)
}
const ClusterCacheCtxKey = "go-openbmclapi.cluster.cache"
func (s *WebDavStorage) Init(ctx context.Context) (err error) {
if alias := s.opt.Alias; alias != "" {
user, ok := config.WebdavUsers[alias]
if !ok {
logErrorf("Web dav user %q does not exists", alias)
os.Exit(1)
}
s.opt.aliasUser = user
var end *url.URL
if end, err = url.Parse(s.opt.aliasUser.EndPoint); err != nil {
return
}
if s.opt.EndPoint != "" {
var full *url.URL
if full, err = end.Parse(s.opt.EndPoint); err != nil {
return
}
s.opt.fullEndPoint = full.String()
} else {
s.opt.fullEndPoint = s.opt.aliasUser.EndPoint
}
} else {
s.opt.fullEndPoint = s.opt.EndPoint
}
if cache, ok := ctx.Value(ClusterCacheCtxKey).(Cache); ok && cache != nil {
s.cache = NewCacheWithNamespace(cache, fmt.Sprintf("redirect-cache@%s;%s@", s.opt.GetUsername(), s.opt.GetEndPoint()))
} else {
s.cache = NoCache
}
s.limitedDialer = NewLimitedDialer(nil, s.opt.MaxConn, s.opt.MaxDownloadRate*1024, s.opt.MaxUploadRate*1024)
s.limitedDialer.SetMinReadRate(1024)
s.limitedDialer.SetMinWriteRate(1024)
s.httpCli = &http.Client{
Transport: &http.Transport{
DialContext: s.limitedDialer.DialContext,
},
}
s.noRedCli = new(http.Client)
*s.noRedCli = *s.httpCli
s.noRedCli.CheckRedirect = func(*http.Request, []*http.Request) error {
return http.ErrUseLastResponse
}
s.cli = gowebdav.NewClient(s.opt.GetEndPoint(), s.opt.GetUsername(), s.opt.GetPassword())
s.cli.SetHeader("User-Agent", ClusterUserAgentFull)
if err := s.cli.Mkdir("measure", 0755); err != nil {
if !webdavIsHTTPError(err, http.StatusConflict) {
logWarnf("Could not create measure folder for %s: %v", s.String(), err)
}
}
if s.opt.PreGenMeasures {
logInfo("Creating measure files at %s", s.String())
for i := 1; i <= 200; i++ {
if err := s.createMeasureFile(ctx, i); err != nil {
os.Exit(2)
}
}
logInfo("Measure files created")
}
return
}
func (s *WebDavStorage) putFile(path string, r io.ReadSeeker) error {
size, err := getFileSize(r)
if err != nil {
return err
}
target, err := url.JoinPath(s.opt.GetEndPoint(), path)
if err != nil {
return err
}
logDebugf("Putting %q", target)
cr := &countReader{r, 0}
req, err := http.NewRequestWithContext(context.TODO(), http.MethodPut, target, cr)
if err != nil {
return err
}
req.SetBasicAuth(s.opt.GetUsername(), s.opt.GetPassword())
req.ContentLength = size
res, err := s.httpCli.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
switch res.StatusCode {
case http.StatusOK, http.StatusCreated, http.StatusNoContent:
return nil
default:
return &HTTPStatusError{Code: res.StatusCode}
}
}
func (s *WebDavStorage) hashToPath(hash string) string {
return path.Join("download", hash[0:2], hash)
}
func (s *WebDavStorage) Size(hash string) (int64, error) {
s.limitedDialer.Acquire()
stat, err := s.cli.Stat(s.hashToPath(hash))
s.limitedDialer.Release()
if err != nil {
return 0, err
}
return stat.Size(), nil
}
func (s *WebDavStorage) Open(hash string) (r io.ReadCloser, err error) {
return s.limitedDialer.DoReader(func() (io.Reader, error) {
return s.cli.ReadStream(s.hashToPath(hash))
})
}
func (s *WebDavStorage) Create(hash string, r io.ReadSeeker) error {
return s.putFile(s.hashToPath(hash), r)
}
func (s *WebDavStorage) Remove(hash string) error {
return s.cli.Remove(s.hashToPath(hash))
}
func (s *WebDavStorage) WalkDir(walker func(hash string, size int64) error) error {
s.limitedDialer.Acquire()
defer s.limitedDialer.Release()
for _, dir := range hex256 {
files, err := s.cli.ReadDir(path.Join("download", dir))
if err != nil {
continue
}
for _, f := range files {
if !f.IsDir() {
if hash := f.Name(); len(hash) >= 2 && hash[:2] == dir {
if err := walker(hash, f.Size()); err != nil {
return err
}
}
}
}
}
return nil
}
func copyHeader(key string, dst, src http.Header) {
v := src.Get(key)
if v != "" {
dst.Set(key, v)
}
}
func (s *WebDavStorage) ServeDownload(rw http.ResponseWriter, req *http.Request, hash string, size int64) (int64, error) {
if !s.opt.FollowRedirect && s.opt.RedirectLinkCache > 0 {
if location, ok := s.cache.Get(hash); ok {
// fix the size for Ranged request
rgs, err := gosrc.ParseRange(req.Header.Get("Range"), size)
if err == nil && len(rgs) > 0 {
var newSize int64 = 0
for _, r := range rgs {
newSize += r.Length
}
if newSize < size {
size = newSize
}
}
rw.Header().Set("Location", location)
rw.Header().Set("Cache-Control", fmt.Sprintf("public,max-age=%d", (int64)(s.opt.RedirectLinkCache.Dur().Seconds())))
rw.WriteHeader(http.StatusFound)
return size, nil
}
}
target, err := url.JoinPath(s.opt.GetEndPoint(), s.hashToPath(hash))
if err != nil {
return 0, err
}
tgReq, err := http.NewRequestWithContext(req.Context(), http.MethodGet, target, nil)
if err != nil {
return 0, err
}
tgReq.SetBasicAuth(s.opt.GetUsername(), s.opt.GetPassword())
rangeH := req.Header.Get("Range")
if rangeH != "" {
tgReq.Header.Set("Range", rangeH)
}
copyHeader("If-Modified-Since", tgReq.Header, req.Header)
copyHeader("If-Unmodified-Since", tgReq.Header, req.Header)
copyHeader("If-None-Match", tgReq.Header, req.Header)
copyHeader("If-Match", tgReq.Header, req.Header)
copyHeader("If-Range", tgReq.Header, req.Header)
cli := s.noRedCli
if s.opt.FollowRedirect {
cli = s.httpCli
}
if !s.limitedDialer.AcquireWithContext(req.Context()) {
return 0, req.Context().Err()
}
defer s.limitedDialer.Release()
resp, err := cli.Do(tgReq)
if err != nil {
return 0, err
}
defer resp.Body.Close()
logDebugf("Requested %q: status=%d", target, resp.StatusCode)
rwh := rw.Header()
switch resp.StatusCode / 100 {
case 3:
// fix the size for Ranged request
rgs, err := gosrc.ParseRange(rangeH, size)
if err == nil && len(rgs) > 0 {
var newSize int64 = 0
for _, r := range rgs {
newSize += r.Length
}
if newSize < size {
size = newSize
}
}
location := resp.Header.Get("Location")
rwh.Set("Location", location)
copyHeader("ETag", rwh, resp.Header)
copyHeader("Last-Modified", rwh, resp.Header)
if s.opt.RedirectLinkCache > 0 {
rwh.Set("Cache-Control", fmt.Sprintf("public,max-age=%d", (int64)(s.opt.RedirectLinkCache.Dur().Seconds())))
s.cache.Set(hash, location, CacheOpt{Expiration: s.opt.RedirectLinkCache.Dur()})
}
rw.WriteHeader(resp.StatusCode)
return size, nil
case 2:
copyHeader("ETag", rwh, resp.Header)
copyHeader("Last-Modified", rwh, resp.Header)
copyHeader("Content-Length", rwh, resp.Header)
copyHeader("Content-Range", rwh, resp.Header)
rw.WriteHeader(resp.StatusCode)
n, _ := io.Copy(rw, resp.Body)
return n, nil
default:
return 0, &HTTPStatusError{Code: resp.StatusCode}
}
}
func (s *WebDavStorage) ServeMeasure(rw http.ResponseWriter, req *http.Request, size int) error {
if err := s.createMeasureFile(req.Context(), size); err != nil {
return err
}
target, err := url.JoinPath(s.opt.GetEndPoint(), "measure", strconv.Itoa(size))
if err != nil {
return err
}
tgReq, err := http.NewRequestWithContext(req.Context(), http.MethodHead, target, nil)
if err != nil {
return err
}
tgReq.SetBasicAuth(s.opt.GetUsername(), s.opt.GetPassword())
rangeH := req.Header.Get("Range")
if rangeH != "" {
tgReq.Header.Set("Range", rangeH)
}
copyHeader("If-Modified-Since", tgReq.Header, req.Header)
copyHeader("If-Unmodified-Since", tgReq.Header, req.Header)
copyHeader("If-None-Match", tgReq.Header, req.Header)
copyHeader("If-Match", tgReq.Header, req.Header)
copyHeader("If-Range", tgReq.Header, req.Header)
resp, err := s.noRedCli.Do(tgReq)
if err != nil {
return err
}
defer resp.Body.Close()
logDebugf("Requested %q: status=%d", target, resp.StatusCode)
rwh := rw.Header()
switch resp.StatusCode / 100 {
case 3:
copyHeader("Location", rwh, resp.Header)
copyHeader("ETag", rwh, resp.Header)
copyHeader("Last-Modified", rwh, resp.Header)
rw.WriteHeader(resp.StatusCode)
return nil
case 2:
// Do not read empty file from webdav, it's not helpful
fallthrough
default:
rw.Header().Set("Content-Length", strconv.Itoa(size*mbChunkSize))
rw.WriteHeader(http.StatusOK)
if req.Method == http.MethodGet {
for i := 0; i < size; i++ {
rw.Write(mbChunk[:])
}
}
return nil
}
}
func (s *WebDavStorage) createMeasureFile(ctx context.Context, size int) (err error) {
t := path.Join("measure", strconv.Itoa(size))
tsz := (int64)(size) * mbChunkSize
if size == 0 {
tsz = 2
}
if stat, err := s.cli.Stat(t); err == nil {
sz := stat.Size()
if sz == tsz {
return nil
}
logDebugf("File [%d] size %d does not match %d", size, sz, tsz)
} else if e := ctx.Err(); e != nil {
return e
} else if !errors.Is(err, os.ErrNotExist) {
logErrorf("Cannot get stat of %s: %v", t, err)
}
logInfof("Creating measure file at %q", t)
if err = s.putFile(t, io.NewSectionReader(EmptyReader, 0, tsz)); err != nil {
logErrorf("Cannot create measure file %q: %v", t, err)
return
}
return nil
}