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package weed_server
import (
"bytes"
"context"
"fmt"
"io"
"mime"
"net/http"
"net/url"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/images"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
xhttp "github.com/chrislusf/seaweedfs/weed/s3api/http"
"github.com/chrislusf/seaweedfs/weed/stats"
"github.com/chrislusf/seaweedfs/weed/util"
)
func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request) {
path := r.URL.Path
isForDirectory := strings.HasSuffix(path, "/")
if isForDirectory && len(path) > 1 {
path = path[:len(path)-1]
}
entry, err := fs.filer.FindEntry(context.Background(), util.FullPath(path))
if err != nil {
if path == "/" {
fs.listDirectoryHandler(w, r)
return
}
if err == filer_pb.ErrNotFound {
glog.V(1).Infof("Not found %s: %v", path, err)
stats.FilerRequestCounter.WithLabelValues("read.notfound").Inc()
w.WriteHeader(http.StatusNotFound)
} else {
glog.Errorf("Internal %s: %v", path, err)
stats.FilerRequestCounter.WithLabelValues("read.internalerror").Inc()
w.WriteHeader(http.StatusInternalServerError)
}
return
}
if entry.IsDirectory() {
if fs.option.DisableDirListing {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
fs.listDirectoryHandler(w, r)
return
}
if isForDirectory {
w.WriteHeader(http.StatusNotFound)
return
}
// set etag
etag := filer.ETagEntry(entry)
if ifm := r.Header.Get("If-Match"); ifm != "" && (ifm != "\""+etag+"\"" && ifm != etag) {
w.WriteHeader(http.StatusPreconditionFailed)
return
}
w.Header().Set("Accept-Ranges", "bytes")
// mime type
mimeType := entry.Attr.Mime
if mimeType == "" {
if ext := filepath.Ext(entry.Name()); ext != "" {
mimeType = mime.TypeByExtension(ext)
}
}
if mimeType != "" {
w.Header().Set("Content-Type", mimeType)
}
// if modified since
if !entry.Attr.Mtime.IsZero() {
w.Header().Set("Last-Modified", entry.Attr.Mtime.UTC().Format(http.TimeFormat))
if r.Header.Get("If-Modified-Since") != "" {
if t, parseError := time.Parse(http.TimeFormat, r.Header.Get("If-Modified-Since")); parseError == nil {
if !t.Before(entry.Attr.Mtime) {
w.WriteHeader(http.StatusNotModified)
return
}
}
}
}
// print out the header from extended properties
for k, v := range entry.Extended {
if !strings.HasPrefix(k, "xattr-") {
// "xattr-" prefix is set in filesys.XATTR_PREFIX
w.Header().Set(k, string(v))
}
}
//Seaweed custom header are not visible to Vue or javascript
seaweedHeaders := []string{}
for header := range w.Header() {
if strings.HasPrefix(header, "Seaweed-") {
seaweedHeaders = append(seaweedHeaders, header)
}
}
seaweedHeaders = append(seaweedHeaders, "Content-Disposition")
w.Header().Set("Access-Control-Expose-Headers", strings.Join(seaweedHeaders, ","))
//set tag count
if r.Method == "GET" {
tagCount := 0
for k := range entry.Extended {
if strings.HasPrefix(k, xhttp.AmzObjectTagging+"-") {
tagCount++
}
}
if tagCount > 0 {
w.Header().Set(xhttp.AmzTagCount, strconv.Itoa(tagCount))
}
}
if inm := r.Header.Get("If-None-Match"); inm == "\""+etag+"\"" {
w.WriteHeader(http.StatusNotModified)
return
}
setEtag(w, etag)
filename := entry.Name()
filename = url.QueryEscape(filename)
adjustHeaderContentDisposition(w, r, filename)
totalSize := int64(entry.Size())
if r.Method == "HEAD" {
w.Header().Set("Content-Length", strconv.FormatInt(totalSize, 10))
return
}
if rangeReq := r.Header.Get("Range"); rangeReq == "" {
ext := filepath.Ext(filename)
if len(ext) > 0 {
ext = strings.ToLower(ext)
}
width, height, mode, shouldResize := shouldResizeImages(ext, r)
if shouldResize {
data, err := filer.ReadAll(fs.filer.MasterClient, entry.Chunks)
if err != nil {
glog.Errorf("failed to read %s: %v", path, err)
w.WriteHeader(http.StatusNotModified)
return
}
rs, _, _ := images.Resized(ext, bytes.NewReader(data), width, height, mode)
io.Copy(w, rs)
return
}
}
processRangeRequest(r, w, totalSize, mimeType, func(writer io.Writer, offset int64, size int64) error {
if offset+size <= int64(len(entry.Content)) {
_, err := writer.Write(entry.Content[offset : offset+size])
if err != nil {
glog.Errorf("failed to write entry content: %v", err)
}
return err
}
chunks := entry.Chunks
if entry.IsInRemoteOnly() {
dir, name := entry.FullPath.DirAndName()
if resp, err := fs.DownloadToLocal(context.Background(), &filer_pb.DownloadToLocalRequest{
Directory: dir,
Name: name,
}); err != nil {
glog.Errorf("DownloadToLocal %s: %v", entry.FullPath, err)
return fmt.Errorf("cache %s: %v", entry.FullPath, err)
} else {
chunks = resp.Entry.Chunks
}
}
err = filer.StreamContent(fs.filer.MasterClient, writer, chunks, offset, size)
if err != nil {
glog.Errorf("failed to stream content %s: %v", r.URL, err)
}
return err
})
}
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