use MD5 for ETag to be consistent with Amazon S3

other/java/s3copy/copier/src/main/java/com/seaweedfs/s3/PutObject.java

@@ -12,13 +12,21 @@ import com.amazonaws.services.s3.AmazonS3;
 import com.amazonaws.services.s3.AmazonS3ClientBuilder;
 import com.amazonaws.services.s3.model.ObjectMetadata;
 import com.amazonaws.services.s3.model.PutObjectRequest;
+import com.amazonaws.services.s3.model.S3Object;
+import com.amazonaws.util.IOUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 
 import java.io.File;
+import java.io.IOException;
 
 /**
  * Hello world!
  */
 public class PutObject {
+
+    private static Log log = LogFactory.getLog(PutObject.class);
+
     public static void main(String[] args) {
 
         AWSCredentials credentials = new BasicAWSCredentials("ANY-ACCESSKEYID", "ANY-SECRETACCESSKEY");
@@ -39,10 +47,11 @@ public class PutObject {
         String fileObjKeyName = "fileObject2";
         String fileName = args[0];
 
+        String stringContent = "Uploaded String Object v3";
         try {
 
             // Upload a text string as a new object.
-            s3Client.putObject(bucketName, stringObjKeyName, "Uploaded String Object v3");
+            s3Client.putObject(bucketName, stringObjKeyName, stringContent);
 
             // Upload a file as a new object with ContentType and title specified.
             PutObjectRequest request = new PutObjectRequest(bucketName, fileObjKeyName, new File(fileName));
@@ -51,6 +60,23 @@ public class PutObject {
             metadata.addUserMetadata("x-amz-meta-title", "someTitle");
             request.setMetadata(metadata);
             s3Client.putObject(request);
+
+            S3Object written = s3Client.getObject(bucketName, stringObjKeyName);
+
+
+            try {
+                String expected = IOUtils.toString(written.getObjectContent());
+
+                if (!stringContent.equals(expected)){
+                    System.out.println("Failed to put and get back the content!");
+                }
+
+            } catch (IOException e) {
+                throw new SdkClientException("Error streaming content from S3 during download");
+            } finally {
+                IOUtils.closeQuietly(written, log);
+            }
+
         } catch (AmazonServiceException e) {
             // The call was transmitted successfully, but Amazon S3 couldn't process
             // it, so it returned an error response.

weed/s3api/s3api_object_handlers.go

@@ -63,6 +63,7 @@ func (s3a *S3ApiServer) GetObjectHandler(w http.ResponseWriter, r *http.Request)
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
+	object := getObject(vars)
 
 	if strings.HasSuffix(r.URL.Path, "/") {
 		writeErrorResponse(w, ErrNotImplemented, r.URL)
@@ -70,7 +71,7 @@ func (s3a *S3ApiServer) GetObjectHandler(w http.ResponseWriter, r *http.Request)
 	}
 
 	destUrl := fmt.Sprintf("http://%s%s/%s%s",
-		s3a.option.Filer, s3a.option.BucketsPath, bucket, r.RequestURI)
+		s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
 
 	s3a.proxyToFiler(w, r, destUrl, passThroghResponse)
 
@@ -80,9 +81,10 @@ func (s3a *S3ApiServer) HeadObjectHandler(w http.ResponseWriter, r *http.Request
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
+	object := getObject(vars)
 
 	destUrl := fmt.Sprintf("http://%s%s/%s%s",
-		s3a.option.Filer, s3a.option.BucketsPath, bucket, r.RequestURI)
+		s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
 
 	s3a.proxyToFiler(w, r, destUrl, passThroghResponse)
 
@@ -92,9 +94,10 @@ func (s3a *S3ApiServer) DeleteObjectHandler(w http.ResponseWriter, r *http.Reque
 
 	vars := mux.Vars(r)
 	bucket := vars["bucket"]
+	object := getObject(vars)
 
 	destUrl := fmt.Sprintf("http://%s%s/%s%s",
-		s3a.option.Filer, s3a.option.BucketsPath, bucket, r.RequestURI)
+		s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
 
 	s3a.proxyToFiler(w, r, destUrl, func(proxyResonse *http.Response, w http.ResponseWriter) {
 		for k, v := range proxyResonse.Header {
@@ -125,6 +128,7 @@ func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, des
 
 	proxyReq.Header.Set("Host", s3a.option.Filer)
 	proxyReq.Header.Set("X-Forwarded-For", r.RemoteAddr)
+	proxyReq.Header.Set("Etag-MD5", "True")
 
 	for header, values := range r.Header {
 		for _, value := range values {

weed/server/volume_server_handlers_read.go

@@ -92,7 +92,11 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 		w.WriteHeader(http.StatusNotModified)
 		return
 	}
+	if r.Header.Get("ETag-MD5") == "True" {
+		setEtag(w, n.MD5())
+	}else{
 		setEtag(w, n.Etag())
+	}
 
 	if n.HasPairs() {
 		pairMap := make(map[string]string)

weed/storage/crc.go

@@ -2,8 +2,9 @@ package storage
 
 import (
 	"fmt"
-	"github.com/klauspost/crc32"
+	"crypto/md5"
 
+	"github.com/klauspost/crc32"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
@@ -28,3 +29,13 @@ func (n *Needle) Etag() string {
 	util.Uint32toBytes(bits, uint32(n.Checksum))
 	return fmt.Sprintf("%x", bits)
 }
+
+func (n *Needle) MD5() string {
+
+	hash := md5.New()
+
+	hash.Write(n.Data)
+
+	return fmt.Sprintf("%x", hash.Sum(nil))
+
+}