mirror of
https://github.com/seaweedfs/seaweedfs.git
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264 lines
7.8 KiB
Go
264 lines
7.8 KiB
Go
package weed_server
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"math"
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"mime"
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"net/http"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
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"github.com/seaweedfs/seaweedfs/weed/util/mem"
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"github.com/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/images"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/seaweedfs/weed/stats"
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"github.com/seaweedfs/seaweedfs/weed/util"
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)
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// Validates the preconditions. Returns true if GET/HEAD operation should not proceed.
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// Preconditions supported are:
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//
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// If-Modified-Since
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// If-Unmodified-Since
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// If-Match
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// If-None-Match
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func checkPreconditions(w http.ResponseWriter, r *http.Request, entry *filer.Entry) bool {
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etag := filer.ETagEntry(entry)
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/// When more than one conditional request header field is present in a
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/// request, the order in which the fields are evaluated becomes
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/// important. In practice, the fields defined in this document are
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/// consistently implemented in a single, logical order, since "lost
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/// update" preconditions have more strict requirements than cache
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/// validation, a validated cache is more efficient than a partial
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/// response, and entity tags are presumed to be more accurate than date
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/// validators. https://tools.ietf.org/html/rfc7232#section-5
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if entry.Attr.Mtime.IsZero() {
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return false
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}
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w.Header().Set("Last-Modified", entry.Attr.Mtime.UTC().Format(http.TimeFormat))
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ifMatchETagHeader := r.Header.Get("If-Match")
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ifUnmodifiedSinceHeader := r.Header.Get("If-Unmodified-Since")
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if ifMatchETagHeader != "" {
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if util.CanonicalizeETag(etag) != util.CanonicalizeETag(ifMatchETagHeader) {
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w.WriteHeader(http.StatusPreconditionFailed)
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return true
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}
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} else if ifUnmodifiedSinceHeader != "" {
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if t, parseError := time.Parse(http.TimeFormat, ifUnmodifiedSinceHeader); parseError == nil {
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if t.Before(entry.Attr.Mtime) {
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w.WriteHeader(http.StatusPreconditionFailed)
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return true
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}
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}
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}
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ifNoneMatchETagHeader := r.Header.Get("If-None-Match")
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ifModifiedSinceHeader := r.Header.Get("If-Modified-Since")
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if ifNoneMatchETagHeader != "" {
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if util.CanonicalizeETag(etag) == util.CanonicalizeETag(ifNoneMatchETagHeader) {
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w.WriteHeader(http.StatusNotModified)
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return true
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}
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} else if ifModifiedSinceHeader != "" {
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if t, parseError := time.Parse(http.TimeFormat, ifModifiedSinceHeader); parseError == nil {
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if !t.Before(entry.Attr.Mtime) {
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w.WriteHeader(http.StatusNotModified)
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return true
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}
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}
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}
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return false
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}
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func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request) {
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path := r.URL.Path
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isForDirectory := strings.HasSuffix(path, "/")
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if isForDirectory && len(path) > 1 {
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path = path[:len(path)-1]
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}
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entry, err := fs.filer.FindEntry(context.Background(), util.FullPath(path))
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if err != nil {
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if path == "/" {
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fs.listDirectoryHandler(w, r)
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return
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}
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if err == filer_pb.ErrNotFound {
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glog.V(2).Infof("Not found %s: %v", path, err)
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stats.FilerHandlerCounter.WithLabelValues(stats.ErrorReadNotFound).Inc()
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w.WriteHeader(http.StatusNotFound)
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} else {
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glog.Errorf("Internal %s: %v", path, err)
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stats.FilerHandlerCounter.WithLabelValues(stats.ErrorReadInternal).Inc()
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w.WriteHeader(http.StatusInternalServerError)
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}
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return
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}
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query := r.URL.Query()
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if entry.IsDirectory() {
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if fs.option.DisableDirListing {
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w.WriteHeader(http.StatusForbidden)
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return
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}
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if query.Get("metadata") == "true" {
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writeJsonQuiet(w, r, http.StatusOK, entry)
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return
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}
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if entry.Attr.Mime == "" || (entry.Attr.Mime == s3_constants.FolderMimeType && r.Header.Get(s3_constants.AmzIdentityId) == "") {
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// return index of directory for non s3 gateway
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fs.listDirectoryHandler(w, r)
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return
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}
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// inform S3 API this is a user created directory key object
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w.Header().Set(s3_constants.X_SeaweedFS_Header_Directory_Key, "true")
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}
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if isForDirectory && entry.Attr.Mime != s3_constants.FolderMimeType {
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w.WriteHeader(http.StatusNotFound)
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return
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}
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if query.Get("metadata") == "true" {
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if query.Get("resolveManifest") == "true" {
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if entry.Chunks, _, err = filer.ResolveChunkManifest(
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fs.filer.MasterClient.GetLookupFileIdFunction(),
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entry.GetChunks(), 0, math.MaxInt64); err != nil {
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err = fmt.Errorf("failed to resolve chunk manifest, err: %s", err.Error())
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writeJsonError(w, r, http.StatusInternalServerError, err)
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return
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}
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}
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writeJsonQuiet(w, r, http.StatusOK, entry)
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return
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}
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etag := filer.ETagEntry(entry)
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if checkPreconditions(w, r, entry) {
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return
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}
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w.Header().Set("Accept-Ranges", "bytes")
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// mime type
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mimeType := entry.Attr.Mime
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if mimeType == "" {
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if ext := filepath.Ext(entry.Name()); ext != "" {
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mimeType = mime.TypeByExtension(ext)
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}
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}
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if mimeType != "" {
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w.Header().Set("Content-Type", mimeType)
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} else {
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w.Header().Set("Content-Type", "application/octet-stream")
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}
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// print out the header from extended properties
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for k, v := range entry.Extended {
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if !strings.HasPrefix(k, "xattr-") {
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// "xattr-" prefix is set in filesys.XATTR_PREFIX
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w.Header().Set(k, string(v))
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}
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}
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//Seaweed custom header are not visible to Vue or javascript
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seaweedHeaders := []string{}
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for header := range w.Header() {
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if strings.HasPrefix(header, "Seaweed-") {
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seaweedHeaders = append(seaweedHeaders, header)
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}
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}
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seaweedHeaders = append(seaweedHeaders, "Content-Disposition")
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w.Header().Set("Access-Control-Expose-Headers", strings.Join(seaweedHeaders, ","))
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//set tag count
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tagCount := 0
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for k := range entry.Extended {
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if strings.HasPrefix(k, s3_constants.AmzObjectTagging+"-") {
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tagCount++
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}
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}
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if tagCount > 0 {
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w.Header().Set(s3_constants.AmzTagCount, strconv.Itoa(tagCount))
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}
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setEtag(w, etag)
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filename := entry.Name()
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adjustPassthroughHeaders(w, r, filename)
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totalSize := int64(entry.Size())
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if r.Method == "HEAD" {
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w.Header().Set("Content-Length", strconv.FormatInt(totalSize, 10))
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return
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}
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if rangeReq := r.Header.Get("Range"); rangeReq == "" {
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ext := filepath.Ext(filename)
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if len(ext) > 0 {
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ext = strings.ToLower(ext)
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}
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width, height, mode, shouldResize := shouldResizeImages(ext, r)
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if shouldResize {
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data := mem.Allocate(int(totalSize))
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defer mem.Free(data)
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err := filer.ReadAll(data, fs.filer.MasterClient, entry.GetChunks())
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if err != nil {
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glog.Errorf("failed to read %s: %v", path, err)
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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rs, _, _ := images.Resized(ext, bytes.NewReader(data), width, height, mode)
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io.Copy(w, rs)
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return
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}
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}
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processRangeRequest(r, w, totalSize, mimeType, func(writer io.Writer, offset int64, size int64) error {
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if offset+size <= int64(len(entry.Content)) {
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_, err := writer.Write(entry.Content[offset : offset+size])
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if err != nil {
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stats.FilerHandlerCounter.WithLabelValues(stats.ErrorWriteEntry).Inc()
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glog.Errorf("failed to write entry content: %v", err)
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}
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return err
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}
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chunks := entry.GetChunks()
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if entry.IsInRemoteOnly() {
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dir, name := entry.FullPath.DirAndName()
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if resp, err := fs.CacheRemoteObjectToLocalCluster(context.Background(), &filer_pb.CacheRemoteObjectToLocalClusterRequest{
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Directory: dir,
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Name: name,
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}); err != nil {
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stats.FilerHandlerCounter.WithLabelValues(stats.ErrorReadCache).Inc()
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glog.Errorf("CacheRemoteObjectToLocalCluster %s: %v", entry.FullPath, err)
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return fmt.Errorf("cache %s: %v", entry.FullPath, err)
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} else {
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chunks = resp.Entry.GetChunks()
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}
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}
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err = filer.StreamContentWithThrottler(fs.filer.MasterClient, writer, chunks, offset, size, fs.option.DownloadMaxBytesPs)
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if err != nil {
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stats.FilerHandlerCounter.WithLabelValues(stats.ErrorReadStream).Inc()
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glog.Errorf("failed to stream content %s: %v", r.URL, err)
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}
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return err
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})
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}
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