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package s3api
import (
"bytes"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"time"
"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
"github.com/seaweedfs/seaweedfs/weed/s3api/s3err"
"github.com/seaweedfs/seaweedfs/weed/util/mem"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/util"
)
func mimeDetect(r *http.Request, dataReader io.Reader) io.ReadCloser {
mimeBuffer := make([]byte, 512)
size, _ := dataReader.Read(mimeBuffer)
if size > 0 {
r.Header.Set("Content-Type", http.DetectContentType(mimeBuffer[:size]))
return io.NopCloser(io.MultiReader(bytes.NewReader(mimeBuffer[:size]), dataReader))
}
return io.NopCloser(dataReader)
}
func urlEscapeObject(object string) string {
t := urlPathEscape(removeDuplicateSlashes(object))
if strings.HasPrefix(t, "/") {
return t
}
return "/" + t
}
func urlPathEscape(object string) string {
var escapedParts []string
for _, part := range strings.Split(object, "/") {
escapedParts = append(escapedParts, url.PathEscape(part))
}
return strings.Join(escapedParts, "/")
}
func removeDuplicateSlashes(object string) string {
result := strings.Builder{}
result.Grow(len(object))
isLastSlash := false
for _, r := range object {
switch r {
case '/':
if !isLastSlash {
result.WriteRune(r)
}
isLastSlash = true
default:
result.WriteRune(r)
isLastSlash = false
}
}
return result.String()
}
func (s3a *S3ApiServer) toFilerUrl(bucket, object string) string {
object = urlPathEscape(removeDuplicateSlashes(object))
destUrl := fmt.Sprintf("http://%s%s/%s%s",
s3a.option.Filer.ToHttpAddress(), s3a.option.BucketsPath, bucket, object)
return destUrl
}
func (s3a *S3ApiServer) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
bucket, object := s3_constants.GetBucketAndObject(r)
glog.V(3).Infof("GetObjectHandler %s %s", bucket, object)
if strings.HasSuffix(r.URL.Path, "/") {
s3err.WriteErrorResponse(w, r, s3err.ErrNotImplemented)
return
}
destUrl := s3a.toFilerUrl(bucket, object)
s3a.proxyToFiler(w, r, destUrl, false, passThroughResponse)
}
func (s3a *S3ApiServer) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
bucket, object := s3_constants.GetBucketAndObject(r)
glog.V(3).Infof("HeadObjectHandler %s %s", bucket, object)
destUrl := s3a.toFilerUrl(bucket, object)
s3a.proxyToFiler(w, r, destUrl, false, passThroughResponse)
}
func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, destUrl string, isWrite bool, responseFn func(proxyResponse *http.Response, w http.ResponseWriter) (statusCode int)) {
glog.V(3).Infof("s3 proxying %s to %s", r.Method, destUrl)
start := time.Now()
proxyReq, err := http.NewRequest(r.Method, destUrl, r.Body)
if err != nil {
glog.Errorf("NewRequest %s: %v", destUrl, err)
s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
return
}
proxyReq.Header.Set("X-Forwarded-For", r.RemoteAddr)
for k, v := range r.URL.Query() {
if _, ok := s3_constants.PassThroughHeaders[strings.ToLower(k)]; ok {
proxyReq.Header[k] = v
}
if k == "partNumber" {
proxyReq.Header[s3_constants.SeaweedFSPartNumber] = v
}
}
for header, values := range r.Header {
proxyReq.Header[header] = values
}
// ensure that the Authorization header is overriding any previous
// Authorization header which might be already present in proxyReq
s3a.maybeAddFilerJwtAuthorization(proxyReq, isWrite)
resp, postErr := s3a.client.Do(proxyReq)
if postErr != nil {
glog.Errorf("post to filer: %v", postErr)
s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
return
}
defer util.CloseResponse(resp)
if resp.StatusCode == http.StatusPreconditionFailed {
s3err.WriteErrorResponse(w, r, s3err.ErrPreconditionFailed)
return
}
if resp.StatusCode == http.StatusRequestedRangeNotSatisfiable {
s3err.WriteErrorResponse(w, r, s3err.ErrInvalidRange)
return
}
if r.Method == http.MethodDelete {
if resp.StatusCode == http.StatusNotFound {
// this is normal
responseStatusCode := responseFn(resp, w)
s3err.PostLog(r, responseStatusCode, s3err.ErrNone)
return
}
}
if resp.StatusCode == http.StatusNotFound {
s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchKey)
return
}
TimeToFirstByte(r.Method, start, r)
if resp.Header.Get(s3_constants.SeaweedFSIsDirectoryKey) == "true" {
responseStatusCode := responseFn(resp, w)
s3err.PostLog(r, responseStatusCode, s3err.ErrNone)
return
}
if resp.StatusCode == http.StatusInternalServerError {
s3err.WriteErrorResponse(w, r, s3err.ErrInternalError)
return
}
// when HEAD a directory, it should be reported as no such key
// https://github.com/seaweedfs/seaweedfs/issues/3457
if resp.ContentLength == -1 && resp.StatusCode != http.StatusNotModified {
s3err.WriteErrorResponse(w, r, s3err.ErrNoSuchKey)
return
}
if resp.StatusCode == http.StatusBadRequest {
resp_body, _ := io.ReadAll(resp.Body)
switch string(resp_body) {
case "InvalidPart":
s3err.WriteErrorResponse(w, r, s3err.ErrInvalidPart)
default:
s3err.WriteErrorResponse(w, r, s3err.ErrInvalidRequest)
}
resp.Body.Close()
return
}
setUserMetadataKeyToLowercase(resp)
responseStatusCode := responseFn(resp, w)
s3err.PostLog(r, responseStatusCode, s3err.ErrNone)
}
func setUserMetadataKeyToLowercase(resp *http.Response) {
for key, value := range resp.Header {
if strings.HasPrefix(key, s3_constants.AmzUserMetaPrefix) {
resp.Header[strings.ToLower(key)] = value
delete(resp.Header, key)
}
}
}
func passThroughResponse(proxyResponse *http.Response, w http.ResponseWriter) (statusCode int) {
for k, v := range proxyResponse.Header {
w.Header()[k] = v
}
if proxyResponse.Header.Get("Content-Range") != "" && proxyResponse.StatusCode == 200 {
w.WriteHeader(http.StatusPartialContent)
statusCode = http.StatusPartialContent
} else {
statusCode = proxyResponse.StatusCode
}
w.WriteHeader(statusCode)
buf := mem.Allocate(128 * 1024)
defer mem.Free(buf)
if n, err := io.CopyBuffer(w, proxyResponse.Body, buf); err != nil {
glog.V(1).Infof("passthrough response read %d bytes: %v", n, err)
}
return statusCode
}
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