alist/server/ftp/fsread.go

185 lines
4.4 KiB
Go

package ftp
import (
"context"
ftpserver "github.com/KirCute/ftpserverlib-pasvportmap"
"github.com/alist-org/alist/v3/internal/errs"
"github.com/alist-org/alist/v3/internal/fs"
"github.com/alist-org/alist/v3/internal/model"
"github.com/alist-org/alist/v3/internal/net"
"github.com/alist-org/alist/v3/internal/op"
"github.com/alist-org/alist/v3/pkg/http_range"
"github.com/alist-org/alist/v3/pkg/utils"
"github.com/alist-org/alist/v3/server/common"
"github.com/pkg/errors"
"io"
fs2 "io/fs"
"net/http"
"os"
"time"
)
type FileDownloadProxy struct {
ftpserver.FileTransfer
reader io.ReadCloser
closers *utils.Closers
}
func OpenDownload(ctx context.Context, reqPath string) (*FileDownloadProxy, error) {
user := ctx.Value("user").(*model.User)
meta, err := op.GetNearestMeta(reqPath)
if err != nil {
if !errors.Is(errors.Cause(err), errs.MetaNotFound) {
return nil, err
}
}
ctx = context.WithValue(ctx, "meta", meta)
if !common.CanAccess(user, meta, reqPath, ctx.Value("meta_pass").(string)) {
return nil, errs.PermissionDenied
}
// directly use proxy
header := *(ctx.Value("proxy_header").(*http.Header))
link, obj, err := fs.Link(ctx, reqPath, model.LinkArgs{
IP: ctx.Value("client_ip").(string),
Header: header,
})
if err != nil {
return nil, err
}
storage, err := fs.GetStorage(reqPath, &fs.GetStoragesArgs{})
if err != nil {
return nil, err
}
if storage.GetStorage().ProxyRange {
common.ProxyRange(link, obj.GetSize())
}
reader, closers, err := proxy(link)
if err != nil {
return nil, err
}
return &FileDownloadProxy{reader: reader, closers: closers}, nil
}
func proxy(link *model.Link) (io.ReadCloser, *utils.Closers, error) {
if link.MFile != nil {
return link.MFile, nil, nil
} else if link.RangeReadCloser != nil {
rc, err := link.RangeReadCloser.RangeRead(context.Background(), http_range.Range{Length: -1})
if err != nil {
return nil, nil, err
}
closers := link.RangeReadCloser.GetClosers()
return rc, &closers, nil
} else {
res, err := net.RequestHttp(context.Background(), http.MethodGet, link.Header, link.URL)
if err != nil {
return nil, nil, err
}
return res.Body, nil, nil
}
}
func (f *FileDownloadProxy) Read(p []byte) (n int, err error) {
return f.reader.Read(p)
}
func (f *FileDownloadProxy) Write(p []byte) (n int, err error) {
return 0, errs.NotSupport
}
func (f *FileDownloadProxy) Seek(offset int64, whence int) (int64, error) {
return 0, errs.NotSupport
}
func (f *FileDownloadProxy) Close() error {
defer func() {
if f.closers != nil {
_ = f.closers.Close()
}
}()
return f.reader.Close()
}
type OsFileInfoAdapter struct {
obj model.Obj
}
func (o *OsFileInfoAdapter) Name() string {
return o.obj.GetName()
}
func (o *OsFileInfoAdapter) Size() int64 {
return o.obj.GetSize()
}
func (o *OsFileInfoAdapter) Mode() fs2.FileMode {
var mode fs2.FileMode = 0755
if o.IsDir() {
mode |= fs2.ModeDir
}
return mode
}
func (o *OsFileInfoAdapter) ModTime() time.Time {
return o.obj.ModTime()
}
func (o *OsFileInfoAdapter) IsDir() bool {
return o.obj.IsDir()
}
func (o *OsFileInfoAdapter) Sys() any {
return o.obj
}
func Stat(ctx context.Context, path string) (os.FileInfo, error) {
user := ctx.Value("user").(*model.User)
reqPath, err := user.JoinPath(path)
if err != nil {
return nil, err
}
meta, err := op.GetNearestMeta(reqPath)
if err != nil {
if !errors.Is(errors.Cause(err), errs.MetaNotFound) {
return nil, err
}
}
ctx = context.WithValue(ctx, "meta", meta)
if !common.CanAccess(user, meta, reqPath, ctx.Value("meta_pass").(string)) {
return nil, errs.PermissionDenied
}
obj, err := fs.Get(ctx, reqPath, &fs.GetArgs{})
if err != nil {
return nil, err
}
return &OsFileInfoAdapter{obj: obj}, nil
}
func List(ctx context.Context, path string) ([]os.FileInfo, error) {
user := ctx.Value("user").(*model.User)
reqPath, err := user.JoinPath(path)
if err != nil {
return nil, err
}
meta, err := op.GetNearestMeta(reqPath)
if err != nil {
if !errors.Is(errors.Cause(err), errs.MetaNotFound) {
return nil, err
}
}
ctx = context.WithValue(ctx, "meta", meta)
if !common.CanAccess(user, meta, reqPath, ctx.Value("meta_pass").(string)) {
return nil, errs.PermissionDenied
}
objs, err := fs.List(ctx, reqPath, &fs.ListArgs{})
if err != nil {
return nil, err
}
ret := make([]os.FileInfo, len(objs))
for i, obj := range objs {
ret[i] = &OsFileInfoAdapter{obj: obj}
}
return ret, nil
}