[TrueCloudLab#5] Refactor middlewares

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/metrics.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"context"
 	"io"
 	"net/http"
 	"strings"
@@ -35,6 +36,7 @@ func (t TrafficType) String() string {
 type RequestType int
 
 const (
+	UNKNOWNRequest RequestType = iota
 	HEADRequest    RequestType = iota
 	PUTRequest     RequestType = iota
 	LISTRequest    RequestType = iota
@@ -44,15 +46,15 @@ const (
 
 func (t RequestType) String() string {
 	switch t {
-	case 0:
-		return "HEAD"
 	case 1:
-		return "PUT"
+		return "HEAD"
 	case 2:
-		return "LIST"
+		return "PUT"
 	case 3:
-		return "GET"
+		return "LIST"
 	case 4:
+		return "GET"
+	case 5:
 		return "DELETE"
 	default:
 		return "Unknown"
@@ -61,35 +63,34 @@ func (t RequestType) String() string {
 
 func RequestTypeFromAPI(api string) RequestType {
 	switch api {
-	case "headobject", "headbucket":
+	case "Options", "HeadObject", "HeadBucket":
 		return HEADRequest
-	case "createmultipartupload", "uploadpartcopy", "uploadpart", "completemutipartupload",
+	case "CreateMultipartUpload", "UploadPartCopy", "UploadPart", "CompleteMultipartUpload",
-		"putobjectacl", "putobjecttagging", "copyobject", "putobjectretention", "putobjectlegalhold",
+		"PutObjectACL", "PutObjectTagging", "CopyObject", "PutObjectRetention", "PutObjectLegalHold",
-		"putobject", "putbucketcors", "putbucketacl", "putbucketlifecycle", "putbucketencryption",
+		"PutObject", "PutBucketCors", "PutBucketACL", "PutBucketLifecycle", "PutBucketEncryption",
-		"putbucketpolicy", "putbucketobjectlockconfig", "putbuckettagging", "putbucketversioning",
+		"PutBucketPolicy", "PutBucketObjectLockConfig", "PutBucketTagging", "PutBucketVersioning",
-		"putbucketnotification", "createbucket", "postobject":
+		"PutBucketNotification", "CreateBucket", "PostObject":
 		return PUTRequest
-	case "listmultipartuploads", "listobjectsv2M", "listobjectsv2", "listbucketversions",
+	case "ListObjectParts", "ListMultipartUploads", "ListObjectsV2M", "ListObjectsV2", "ListBucketVersions",
-		"listobjectsv1", "listbuckets":
+		"ListObjectsV1", "ListBuckets":
 		return LISTRequest
-	case "getobjectacl", "getobjecttagging", "getobjectretention", "getobjectlegalhold",
+	case "GetObjectACL", "GetObjectTagging", "SelectObjectContent", "GetObjectRetention", "getobjectlegalhold",
-		"getobjectattributes", "getobject", "getbucketlocation", "getbucketpolicy",
+		"GetObjectAttributes", "GetObject", "GetBucketLocation", "GetBucketPolicy",
-		"getbucketlifecycle", "getbucketencryption", "getbucketcors", "getbucketacl",
+		"GetBucketLifecycle", "GetBucketEncryption", "GetBucketCors", "GetBucketACL",
-		"getbucketwebsite", "getbucketaccelerate", "getbucketrequestpayment", "getbucketlogging",
+		"GetBucketWebsite", "GetBucketAccelerate", "GetBucketRequestPayment", "GetBucketLogging",
-		"getbucketreplication", "getbuckettagging", "selectobjectcontent",
+		"GetBucketReplication", "GetBucketTagging", "GetBucketObjectLockConfig",
-		"getbucketobjectlockconfiguration", "getbucketversioning", "getbucketnotification",
+		"GetBucketVersioning", "GetBucketNotification", "ListenBucketNotification":
-		"listenbucketnotification":
 		return GETRequest
-	case "abortmultipartupload", "deleteobjecttagging", "deleteobject", "deletebucketcors",
+	case "AbortMultipartUpload", "DeleteObjectTagging", "DeleteObject", "DeleteBucketCors",
-		"deletebucketwebsite", "deletebuckettagging", "deletemultipleobjects", "deletebucketpolicy",
+		"DeleteBucketWebsite", "DeleteBucketTagging", "DeleteMultipleObjects", "DeleteBucketPolicy",
-		"deletebucketlifecycle", "deletebucketencryption", "deletebucket":
+		"DeleteBucketLifecycle", "DeleteBucketEncryption", "DeleteBucket":
 		return DELETERequest
 	default:
-		return RequestType(-1)
+		return UNKNOWNRequest
 	}
 }
 
-type OperationList [5]int
+type OperationList [6]int
 
 type (
 	// HTTPAPIStats holds statistics information about
@@ -262,11 +263,16 @@ func collectUserMetrics(ch chan<- prometheus.Metric) {
 	}
 }
 
-// APIStats wraps http handler for api with basic statistics collection.
+// CIDResolveFunc is a func to resolve CID in Stats handler.
-func APIStats(api string, f http.HandlerFunc) http.HandlerFunc {
+type CIDResolveFunc func(ctx context.Context, reqInfo *ReqInfo) (cnrID string)
+
+// Stats is a handler that update metrics.
+func Stats(f http.HandlerFunc, resolveCID CIDResolveFunc) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		httpStatsMetric.currentS3Requests.Inc(api)
+		reqInfo := GetReqInfo(r.Context())
-		defer httpStatsMetric.currentS3Requests.Dec(api)
+
+		httpStatsMetric.currentS3Requests.Inc(reqInfo.API)
+		defer httpStatsMetric.currentS3Requests.Dec(reqInfo.API)
 
 		in := &readCounter{ReadCloser: r.Body}
 		out := &writeCounter{ResponseWriter: w}
@@ -278,20 +284,45 @@ func APIStats(api string, f http.HandlerFunc) http.HandlerFunc {
 			startTime:      time.Now(),
 		}
 
-		f.ServeHTTP(statsWriter, r)
+		f(statsWriter, r)
 
 		// Time duration in secs since the call started.
 		// We don't need to do nanosecond precision here
-		// simply for the fact that it is not human readable.
+		// simply for the fact that it is not human-readable.
 		durationSecs := time.Since(statsWriter.startTime).Seconds()
 
-		httpStatsMetric.updateStats(api, statsWriter, r, durationSecs, in.countBytes, out.countBytes)
+		user := resolveUser(r.Context())
+		cnrID := resolveCID(r.Context(), reqInfo)
+		httpStatsMetric.usersS3Requests.Update(user, reqInfo.BucketName, cnrID, RequestTypeFromAPI(reqInfo.API), in.countBytes, out.countBytes)
+
+		code := statsWriter.statusCode
+		// A successful request has a 2xx response code
+		successReq := code >= http.StatusOK && code < http.StatusMultipleChoices
+		if !strings.HasSuffix(r.URL.Path, systemPath) {
+			httpStatsMetric.totalS3Requests.Inc(reqInfo.API)
+			if !successReq && code != 0 {
+				httpStatsMetric.totalS3Errors.Inc(reqInfo.API)
+			}
+		}
+
+		if r.Method == http.MethodGet {
+			// Increment the prometheus http request response histogram with appropriate label
+			httpRequestsDuration.With(prometheus.Labels{"api": reqInfo.API}).Observe(durationSecs)
+		}
 
 		atomic.AddUint64(&httpStatsMetric.totalInputBytes, in.countBytes)
 		atomic.AddUint64(&httpStatsMetric.totalOutputBytes, out.countBytes)
 	}
 }
 
+func resolveUser(ctx context.Context) string {
+	user := "anon"
+	if bd, ok := ctx.Value(BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil && bd.Gate.BearerToken != nil {
+		user = bearer.ResolveIssuer(*bd.Gate.BearerToken).String()
+	}
+	return user
+}
+
 // Inc increments the api stats counter.
 func (stats *HTTPAPIStats) Inc(api string) {
 	if stats == nil {
@@ -350,7 +381,7 @@ func (u *UsersAPIStats) Update(user, bucket, cnrID string, reqType RequestType,
 	}
 
 	bktStat := usersStat.buckets[key]
-	bktStat.Operations[reqType] += 1
+	bktStat.Operations[reqType]++
 	bktStat.InTraffic += in
 	bktStat.OutTraffic += out
 	usersStat.buckets[key] = bktStat
@@ -414,40 +445,6 @@ func (st *HTTPStats) getOutputBytes() uint64 {
 	return atomic.LoadUint64(&st.totalOutputBytes)
 }
 
-// Update statistics from http request and response data.
-func (st *HTTPStats) updateStats(apiOperation string, w http.ResponseWriter, r *http.Request, durationSecs float64, in, out uint64) {
-	var code int
-
-	if res, ok := w.(*responseWrapper); ok {
-		code = res.statusCode
-	}
-
-	user := "anon"
-	if bd, ok := r.Context().Value(BoxData).(*accessbox.Box); ok && bd != nil && bd.Gate != nil && bd.Gate.BearerToken != nil {
-		user = bearer.ResolveIssuer(*bd.Gate.BearerToken).String()
-	}
-
-	reqInfo := GetReqInfo(r.Context())
-	cnrID := GetCID(r.Context())
-
-	st.usersS3Requests.Update(user, reqInfo.BucketName, cnrID, RequestTypeFromAPI(apiOperation), in, out)
-
-	// A successful request has a 2xx response code
-	successReq := code >= http.StatusOK && code < http.StatusMultipleChoices
-
-	if !strings.HasSuffix(r.URL.Path, systemPath) {
-		st.totalS3Requests.Inc(apiOperation)
-		if !successReq && code != 0 {
-			st.totalS3Errors.Inc(apiOperation)
-		}
-	}
-
-	if r.Method == http.MethodGet {
-		// Increment the prometheus http request response histogram with appropriate label
-		httpRequestsDuration.With(prometheus.Labels{"api": apiOperation}).Observe(durationSecs)
-	}
-}
-
 // WriteHeader -- writes http status code.
 func (w *responseWrapper) WriteHeader(code int) {
 	w.Do(func() {

api/reqinfo.go

@@ -2,7 +2,6 @@ package api
 
 import (
 	"context"
-	cid "github.com/TrueCloudLab/frostfs-sdk-go/container/id"
 	"net"
 	"net/http"
 	"net/url"
@@ -43,13 +42,10 @@ type (
 	}
 )
 
-// Key used for Get/Set context values.
+// Key used for Get/SetReqInfo.
 type contextKeyType string
 
-const (
+const ctxRequestInfo = contextKeyType("FrostFS-S3-GW")
-	ctxRequestInfo = contextKeyType("FrostFS-S3-GW")
-	ctxCID         = contextKeyType("FrostFS-S3-GW-CID")
-)
 
 var (
 	// De-facto standard header keys.
@@ -206,21 +202,3 @@ func GetReqInfo(ctx context.Context) *ReqInfo {
 	}
 	return &ReqInfo{}
 }
-
-// SetCID sets CID in the context.
-func SetCID(ctx context.Context, id cid.ID) context.Context {
-	if ctx == nil {
-		return nil
-	}
-	return context.WithValue(ctx, ctxCID, id.EncodeToString())
-}
-
-// GetCID returns CID if set.
-func GetCID(ctx context.Context) string {
-	if ctx == nil {
-		return ""
-	} else if id, ok := ctx.Value(ctxCID).(string); ok {
-		return id
-	}
-	return ""
-}

api/router.go

@@ -108,7 +108,7 @@ const (
 	MimeXML mimeType = "application/xml"
 )
 
-var _ = logErrorResponse
+var _ = logSuccessResponse
 
 func (lrw *logResponseWriter) WriteHeader(code int) {
 	lrw.Do(func() {
@@ -147,33 +147,37 @@ func appendCORS(handler Handler) mux.MiddlewareFunc {
 	}
 }
 
-func resolveBucket(log *zap.Logger, resolveBucket func(ctx context.Context, bucket string) (*data.BucketInfo, error)) mux.MiddlewareFunc {
+// BucketResolveFunc is a func to resolve bucket info by name.
-	return func(h http.Handler) http.Handler {
+type BucketResolveFunc func(ctx context.Context, bucket string) (*data.BucketInfo, error)
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			reqInfo := GetReqInfo(r.Context())
 
-			if reqInfo.BucketName != "" && reqInfo.API != "CreateBucket" {
+// metricsMiddleware wraps http handler for api with basic statistics collection.
-				bktInfo, err := resolveBucket(r.Context(), reqInfo.BucketName)
+func metricsMiddleware(log *zap.Logger, resolveBucket BucketResolveFunc) mux.MiddlewareFunc {
+	return func(h http.Handler) http.Handler {
+		return Stats(h.ServeHTTP, resolveCID(log, resolveBucket))
+	}
+}
+
+// resolveCID forms CIDResolveFunc using BucketResolveFunc.
+func resolveCID(log *zap.Logger, resolveBucket BucketResolveFunc) CIDResolveFunc {
+	return func(ctx context.Context, reqInfo *ReqInfo) (cnrID string) {
+		if reqInfo.BucketName == "" || reqInfo.API == "CreateBucket" || reqInfo.API == "" {
+			return ""
+		}
+
+		bktInfo, err := resolveBucket(ctx, reqInfo.BucketName)
 		if err != nil {
-					code := WriteErrorResponse(w, reqInfo, err)
+			log.Debug("failed to resolve CID",
-					log.Error("failed to resolve bucket", zap.Int("status", code),
 				zap.String("request_id", reqInfo.RequestID), zap.String("method", reqInfo.API),
 				zap.String("bucket", reqInfo.BucketName), zap.String("object", reqInfo.ObjectName),
 				zap.Error(err))
-					return
+			return ""
 		}
 
-				// todo: (@KirillovDenis) consider save bktInfo into ReqInfo
+		return bktInfo.CID.EncodeToString()
-				// (in order to optimize resolving bucket in further handlers)
-				r = r.WithContext(SetCID(r.Context(), bktInfo.CID))
-			}
-
-			h.ServeHTTP(w, r)
-		})
 	}
 }
 
-func logErrorResponse(l *zap.Logger) mux.MiddlewareFunc {
+func logSuccessResponse(l *zap.Logger) mux.MiddlewareFunc {
 	return func(h http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			lw := &logResponseWriter{ResponseWriter: w}
@@ -211,6 +215,30 @@ func GetRequestID(v interface{}) string {
 	}
 }
 
+func setErrorAPI(apiName string, h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ctx := SetReqInfo(r.Context(), &ReqInfo{API: apiName})
+		h.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+// attachErrorHandler set NotFoundHandler and MethodNotAllowedHandler for mux.Router.
+func attachErrorHandler(api *mux.Router, log *zap.Logger, h Handler, center auth.Center) {
+	middlewares := []mux.MiddlewareFunc{
+		AuthMiddleware(log, center),
+		metricsMiddleware(log, h.ResolveBucket),
+	}
+
+	var errorHandler http.Handler = http.HandlerFunc(errorResponseHandler)
+	for i := len(middlewares) - 1; i >= 0; i-- {
+		errorHandler = middlewares[i](errorHandler)
+	}
+
+	// If none of the routes match, add default error handler routes
+	api.NotFoundHandler = setErrorAPI("NotFound", errorHandler)
+	api.MethodNotAllowedHandler = setErrorAPI("MethodNotAllowed", errorHandler)
+}
+
 // Attach adds S3 API handlers from h to r for domains with m client limit using
 // center authentication and log logger.
 func Attach(r *mux.Router, domains []string, m MaxClients, h Handler, center auth.Center, log *zap.Logger) {
@@ -220,15 +248,16 @@ func Attach(r *mux.Router, domains []string, m MaxClients, h Handler, center aut
 		// -- prepare request
 		setRequestID,
 
-		// -- resolve bucket to set cid in context
+		// Attach user authentication for all S3 routes.
-		resolveBucket(log, h.ResolveBucket),
+		AuthMiddleware(log, center),
+
+		metricsMiddleware(log, h.ResolveBucket),
 
 		// -- logging error requests
-		logErrorResponse(log),
+		logSuccessResponse(log),
 	)
 
-	// Attach user authentication for all S3 routes.
+	attachErrorHandler(api, log, h, center)
-	AttachUserAuth(api, center, log)
 
 	buckets := make([]*mux.Router, 0, len(domains)+1)
 	buckets = append(buckets, api.PathPrefix("/{bucket}").Subrouter())
@@ -244,277 +273,327 @@ func Attach(r *mux.Router, domains []string, m MaxClients, h Handler, center aut
 			// -- append CORS headers to a response for
 			appendCORS(h),
 		)
-		bucket.Methods(http.MethodOptions).HandlerFunc(m.Handle(APIStats("preflight", h.Preflight))).Name("Options")
+		bucket.Methods(http.MethodOptions).HandlerFunc(
+			m.Handle(h.Preflight)).
+			Name("Options")
 		bucket.Methods(http.MethodHead).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("headobject", h.HeadObjectHandler))).Name("HeadObject")
+			m.Handle(h.HeadObjectHandler)).
+			Name("HeadObject")
 		// CopyObjectPart
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").Headers(hdrAmzCopySource, "").HandlerFunc(m.Handle(APIStats("uploadpartcopy", h.UploadPartCopy))).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}").
+		bucket.Methods(http.MethodPut).Path("/{object:.+}").Headers(hdrAmzCopySource, "").HandlerFunc(
+			m.Handle(h.UploadPartCopy)).
+			Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}").
 			Name("UploadPartCopy")
 		// PutObjectPart
 		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("uploadpart", h.UploadPartHandler))).Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}").
+			m.Handle(h.UploadPartHandler)).
+			Queries("partNumber", "{partNumber:[0-9]+}", "uploadId", "{uploadId:.*}").
 			Name("UploadPart")
 		// ListParts
 		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("listobjectparts", h.ListPartsHandler))).Queries("uploadId", "{uploadId:.*}").
+			m.Handle(h.ListPartsHandler)).
+			Queries("uploadId", "{uploadId:.*}").
 			Name("ListObjectParts")
 		// CompleteMultipartUpload
 		bucket.Methods(http.MethodPost).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("completemutipartupload", h.CompleteMultipartUploadHandler))).Queries("uploadId", "{uploadId:.*}").
+			m.Handle(h.CompleteMultipartUploadHandler)).
+			Queries("uploadId", "{uploadId:.*}").
 			Name("CompleteMultipartUpload")
 		// CreateMultipartUpload
 		bucket.Methods(http.MethodPost).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("createmultipartupload", h.CreateMultipartUploadHandler))).Queries("uploads", "").
+			m.Handle(h.CreateMultipartUploadHandler)).
+			Queries("uploads", "").
 			Name("CreateMultipartUpload")
 		// AbortMultipartUpload
 		bucket.Methods(http.MethodDelete).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("abortmultipartupload", h.AbortMultipartUploadHandler))).Queries("uploadId", "{uploadId:.*}").
+			m.Handle(h.AbortMultipartUploadHandler)).
+			Queries("uploadId", "{uploadId:.*}").
 			Name("AbortMultipartUpload")
 		// ListMultipartUploads
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("listmultipartuploads", h.ListMultipartUploadsHandler))).Queries("uploads", "").
+			m.Handle(h.ListMultipartUploadsHandler)).
+			Queries("uploads", "").
 			Name("ListMultipartUploads")
 		// GetObjectACL -- this is a dummy call.
 		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("getobjectacl", h.GetObjectACLHandler))).Queries("acl", "").
+			m.Handle(h.GetObjectACLHandler)).
+			Queries("acl", "").
 			Name("GetObjectACL")
 		// PutObjectACL -- this is a dummy call.
 		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("putobjectacl", h.PutObjectACLHandler))).Queries("acl", "").
+			m.Handle(h.PutObjectACLHandler)).
+			Queries("acl", "").
 			Name("PutObjectACL")
 		// GetObjectTagging
 		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("getobjecttagging", h.GetObjectTaggingHandler))).Queries("tagging", "").
+			m.Handle(h.GetObjectTaggingHandler)).
+			Queries("tagging", "").
 			Name("GetObjectTagging")
 		// PutObjectTagging
 		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("putobjecttagging", h.PutObjectTaggingHandler))).Queries("tagging", "").
+			m.Handle(h.PutObjectTaggingHandler)).
+			Queries("tagging", "").
 			Name("PutObjectTagging")
 		// DeleteObjectTagging
 		bucket.Methods(http.MethodDelete).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("deleteobjecttagging", h.DeleteObjectTaggingHandler))).Queries("tagging", "").
+			m.Handle(h.DeleteObjectTaggingHandler)).
+			Queries("tagging", "").
 			Name("DeleteObjectTagging")
 		// SelectObjectContent
 		bucket.Methods(http.MethodPost).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("selectobjectcontent", h.SelectObjectContentHandler))).Queries("select", "").Queries("select-type", "2").
+			m.Handle(h.SelectObjectContentHandler)).
+			Queries("select", "").Queries("select-type", "2").
 			Name("SelectObjectContent")
 		// GetObjectRetention
 		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("getobjectretention", h.GetObjectRetentionHandler))).Queries("retention", "").
+			m.Handle(h.GetObjectRetentionHandler)).
+			Queries("retention", "").
 			Name("GetObjectRetention")
 		// GetObjectLegalHold
 		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("getobjectlegalhold", h.GetObjectLegalHoldHandler))).Queries("legal-hold", "").
+			m.Handle(h.GetObjectLegalHoldHandler)).
+			Queries("legal-hold", "").
 			Name("GetObjectLegalHold")
 		// GetObjectAttributes
 		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("getobjectattributes", h.GetObjectAttributesHandler))).Queries("attributes", "").
+			m.Handle(h.GetObjectAttributesHandler)).
+			Queries("attributes", "").
 			Name("GetObjectAttributes")
 		// GetObject
 		bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("getobject", h.GetObjectHandler))).
+			m.Handle(h.GetObjectHandler)).
 			Name("GetObject")
 		// CopyObject
-		bucket.Methods(http.MethodPut).Path("/{object:.+}").Headers(hdrAmzCopySource, "").HandlerFunc(m.Handle(APIStats("copyobject", h.CopyObjectHandler))).
+		bucket.Methods(http.MethodPut).Path("/{object:.+}").Headers(hdrAmzCopySource, "").HandlerFunc(
+			m.Handle(h.CopyObjectHandler)).
 			Name("CopyObject")
 		// PutObjectRetention
 		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("putobjectretention", h.PutObjectRetentionHandler))).Queries("retention", "").
+			m.Handle(h.PutObjectRetentionHandler)).
+			Queries("retention", "").
 			Name("PutObjectRetention")
 		// PutObjectLegalHold
 		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("putobjectlegalhold", h.PutObjectLegalHoldHandler))).Queries("legal-hold", "").
+			m.Handle(h.PutObjectLegalHoldHandler)).
+			Queries("legal-hold", "").
 			Name("PutObjectLegalHold")
 
 		// PutObject
 		bucket.Methods(http.MethodPut).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("putobject", h.PutObjectHandler))).
+			m.Handle(h.PutObjectHandler)).
 			Name("PutObject")
 		// DeleteObject
 		bucket.Methods(http.MethodDelete).Path("/{object:.+}").HandlerFunc(
-			m.Handle(APIStats("deleteobject", h.DeleteObjectHandler))).
+			m.Handle(h.DeleteObjectHandler)).
 			Name("DeleteObject")
 
 		// Bucket operations
 		// GetBucketLocation
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketlocation", h.GetBucketLocationHandler))).Queries("location", "").
+			m.Handle(h.GetBucketLocationHandler)).
+			Queries("location", "").
 			Name("GetBucketLocation")
 		// GetBucketPolicy
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketpolicy", h.GetBucketPolicyHandler))).Queries("policy", "").
+			m.Handle(h.GetBucketPolicyHandler)).
+			Queries("policy", "").
 			Name("GetBucketPolicy")
 		// GetBucketLifecycle
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketlifecycle", h.GetBucketLifecycleHandler))).Queries("lifecycle", "").
+			m.Handle(h.GetBucketLifecycleHandler)).
+			Queries("lifecycle", "").
 			Name("GetBucketLifecycle")
 		// GetBucketEncryption
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketencryption", h.GetBucketEncryptionHandler))).Queries("encryption", "").
+			m.Handle(h.GetBucketEncryptionHandler)).
+			Queries("encryption", "").
 			Name("GetBucketEncryption")
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketcors", h.GetBucketCorsHandler))).Queries("cors", "").
+			m.Handle(h.GetBucketCorsHandler)).
+			Queries("cors", "").
 			Name("GetBucketCors")
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("putbucketcors", h.PutBucketCorsHandler))).Queries("cors", "").
+			m.Handle(h.PutBucketCorsHandler)).
+			Queries("cors", "").
 			Name("PutBucketCors")
 		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(APIStats("deletebucketcors", h.DeleteBucketCorsHandler))).Queries("cors", "").
+			m.Handle(h.DeleteBucketCorsHandler)).
+			Queries("cors", "").
 			Name("DeleteBucketCors")
 		// Dummy Bucket Calls
 		// GetBucketACL -- this is a dummy call.
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketacl", h.GetBucketACLHandler))).Queries("acl", "").
+			m.Handle(h.GetBucketACLHandler)).
+			Queries("acl", "").
 			Name("GetBucketACL")
 		// PutBucketACL -- this is a dummy call.
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("putbucketacl", h.PutBucketACLHandler))).Queries("acl", "").
+			m.Handle(h.PutBucketACLHandler)).
+			Queries("acl", "").
 			Name("PutBucketACL")
 		// GetBucketWebsiteHandler -- this is a dummy call.
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketwebsite", h.GetBucketWebsiteHandler))).Queries("website", "").
+			m.Handle(h.GetBucketWebsiteHandler)).
+			Queries("website", "").
 			Name("GetBucketWebsite")
 		// GetBucketAccelerateHandler -- this is a dummy call.
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketaccelerate", h.GetBucketAccelerateHandler))).Queries("accelerate", "").
+			m.Handle(h.GetBucketAccelerateHandler)).
+			Queries("accelerate", "").
 			Name("GetBucketAccelerate")
 		// GetBucketRequestPaymentHandler -- this is a dummy call.
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketrequestpayment", h.GetBucketRequestPaymentHandler))).Queries("requestPayment", "").
+			m.Handle(h.GetBucketRequestPaymentHandler)).
+			Queries("requestPayment", "").
 			Name("GetBucketRequestPayment")
 		// GetBucketLoggingHandler -- this is a dummy call.
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketlogging", h.GetBucketLoggingHandler))).Queries("logging", "").
+			m.Handle(h.GetBucketLoggingHandler)).
+			Queries("logging", "").
 			Name("GetBucketLogging")
-		// GetBucketLifecycleHandler -- this is a dummy call.
-		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketlifecycle", h.GetBucketLifecycleHandler))).Queries("lifecycle", "").
-			Name("GetBucketLifecycle")
 		// GetBucketReplicationHandler -- this is a dummy call.
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketreplication", h.GetBucketReplicationHandler))).Queries("replication", "").
+			m.Handle(h.GetBucketReplicationHandler)).
+			Queries("replication", "").
 			Name("GetBucketReplication")
 		// GetBucketTaggingHandler
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbuckettagging", h.GetBucketTaggingHandler))).Queries("tagging", "").
+			m.Handle(h.GetBucketTaggingHandler)).
+			Queries("tagging", "").
 			Name("GetBucketTagging")
 		// DeleteBucketWebsiteHandler
 		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(APIStats("deletebucketwebsite", h.DeleteBucketWebsiteHandler))).Queries("website", "").
+			m.Handle(h.DeleteBucketWebsiteHandler)).
+			Queries("website", "").
 			Name("DeleteBucketWebsite")
 		// DeleteBucketTaggingHandler
 		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(APIStats("deletebuckettagging", h.DeleteBucketTaggingHandler))).Queries("tagging", "").
+			m.Handle(h.DeleteBucketTaggingHandler)).
+			Queries("tagging", "").
 			Name("DeleteBucketTagging")
 
 		// GetBucketObjectLockConfig
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketobjectlockconfiguration", h.GetBucketObjectLockConfigHandler))).Queries("object-lock", "").
+			m.Handle(h.GetBucketObjectLockConfigHandler)).
+			Queries("object-lock", "").
 			Name("GetBucketObjectLockConfig")
 		// GetBucketVersioning
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketversioning", h.GetBucketVersioningHandler))).Queries("versioning", "").
+			m.Handle(h.GetBucketVersioningHandler)).
+			Queries("versioning", "").
 			Name("GetBucketVersioning")
 		// GetBucketNotification
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("getbucketnotification", h.GetBucketNotificationHandler))).Queries("notification", "").
+			m.Handle(h.GetBucketNotificationHandler)).
+			Queries("notification", "").
 			Name("GetBucketNotification")
 		// ListenBucketNotification
-		bucket.Methods(http.MethodGet).HandlerFunc(APIStats("listenbucketnotification", h.ListenBucketNotificationHandler)).Queries("events", "{events:.*}").
+		bucket.Methods(http.MethodGet).HandlerFunc(h.ListenBucketNotificationHandler).
+			Queries("events", "{events:.*}").
 			Name("ListenBucketNotification")
 		// ListObjectsV2M
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("listobjectsv2M", h.ListObjectsV2MHandler))).Queries("list-type", "2", "metadata", "true").
+			m.Handle(h.ListObjectsV2MHandler)).
+			Queries("list-type", "2", "metadata", "true").
 			Name("ListObjectsV2M")
 		// ListObjectsV2
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("listobjectsv2", h.ListObjectsV2Handler))).Queries("list-type", "2").
+			m.Handle(h.ListObjectsV2Handler)).
+			Queries("list-type", "2").
 			Name("ListObjectsV2")
 		// ListBucketVersions
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("listbucketversions", h.ListBucketObjectVersionsHandler))).Queries("versions", "").
+			m.Handle(h.ListBucketObjectVersionsHandler)).
+			Queries("versions", "").
 			Name("ListBucketVersions")
 		// ListObjectsV1 (Legacy)
 		bucket.Methods(http.MethodGet).HandlerFunc(
-			m.Handle(APIStats("listobjectsv1", h.ListObjectsV1Handler))).
+			m.Handle(h.ListObjectsV1Handler)).
 			Name("ListObjectsV1")
 		// PutBucketLifecycle
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("putbucketlifecycle", h.PutBucketLifecycleHandler))).Queries("lifecycle", "").
+			m.Handle(h.PutBucketLifecycleHandler)).
+			Queries("lifecycle", "").
 			Name("PutBucketLifecycle")
 		// PutBucketEncryption
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("putbucketencryption", h.PutBucketEncryptionHandler))).Queries("encryption", "").
+			m.Handle(h.PutBucketEncryptionHandler)).
+			Queries("encryption", "").
 			Name("PutBucketEncryption")
 
 		// PutBucketPolicy
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("putbucketpolicy", h.PutBucketPolicyHandler))).Queries("policy", "").
+			m.Handle(h.PutBucketPolicyHandler)).
+			Queries("policy", "").
 			Name("PutBucketPolicy")
 
 		// PutBucketObjectLockConfig
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("putbucketobjectlockconfig", h.PutBucketObjectLockConfigHandler))).Queries("object-lock", "").
+			m.Handle(h.PutBucketObjectLockConfigHandler)).
+			Queries("object-lock", "").
 			Name("PutBucketObjectLockConfig")
 		// PutBucketTaggingHandler
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("putbuckettagging", h.PutBucketTaggingHandler))).Queries("tagging", "").
+			m.Handle(h.PutBucketTaggingHandler)).
+			Queries("tagging", "").
 			Name("PutBucketTagging")
 		// PutBucketVersioning
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("putbucketversioning", h.PutBucketVersioningHandler))).Queries("versioning", "").
+			m.Handle(h.PutBucketVersioningHandler)).
+			Queries("versioning", "").
 			Name("PutBucketVersioning")
 		// PutBucketNotification
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("putbucketnotification", h.PutBucketNotificationHandler))).Queries("notification", "").
+			m.Handle(h.PutBucketNotificationHandler)).
+			Queries("notification", "").
 			Name("PutBucketNotification")
 		// CreateBucket
 		bucket.Methods(http.MethodPut).HandlerFunc(
-			m.Handle(APIStats("createbucket", h.CreateBucketHandler))).
+			m.Handle(h.CreateBucketHandler)).
 			Name("CreateBucket")
 		// HeadBucket
 		bucket.Methods(http.MethodHead).HandlerFunc(
-			m.Handle(APIStats("headbucket", h.HeadBucketHandler))).
+			m.Handle(h.HeadBucketHandler)).
 			Name("HeadBucket")
 		// PostPolicy
 		bucket.Methods(http.MethodPost).HeadersRegexp(hdrContentType, "multipart/form-data*").HandlerFunc(
-			m.Handle(APIStats("postobject", h.PostObject))).
+			m.Handle(h.PostObject)).
 			Name("PostObject")
 		// DeleteMultipleObjects
 		bucket.Methods(http.MethodPost).HandlerFunc(
-			m.Handle(APIStats("deletemultipleobjects", h.DeleteMultipleObjectsHandler))).Queries("delete", "").
+			m.Handle(h.DeleteMultipleObjectsHandler)).
+			Queries("delete", "").
 			Name("DeleteMultipleObjects")
 		// DeleteBucketPolicy
 		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(APIStats("deletebucketpolicy", h.DeleteBucketPolicyHandler))).Queries("policy", "").
+			m.Handle(h.DeleteBucketPolicyHandler)).
+			Queries("policy", "").
 			Name("DeleteBucketPolicy")
 		// DeleteBucketLifecycle
 		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(APIStats("deletebucketlifecycle", h.DeleteBucketLifecycleHandler))).Queries("lifecycle", "").
+			m.Handle(h.DeleteBucketLifecycleHandler)).
+			Queries("lifecycle", "").
 			Name("DeleteBucketLifecycle")
 		// DeleteBucketEncryption
 		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(APIStats("deletebucketencryption", h.DeleteBucketEncryptionHandler))).Queries("encryption", "").
+			m.Handle(h.DeleteBucketEncryptionHandler)).
+			Queries("encryption", "").
 			Name("DeleteBucketEncryption")
 		// DeleteBucket
 		bucket.Methods(http.MethodDelete).HandlerFunc(
-			m.Handle(APIStats("deletebucket", h.DeleteBucketHandler))).
+			m.Handle(h.DeleteBucketHandler)).
 			Name("DeleteBucket")
 	}
 	// Root operation
 
 	// ListBuckets
 	api.Methods(http.MethodGet).Path(SlashSeparator).HandlerFunc(
-		m.Handle(APIStats("listbuckets", h.ListBucketsHandler))).
+		m.Handle(h.ListBucketsHandler)).
 		Name("ListBuckets")
 
 	// S3 browser with signature v4 adds '//' for ListBuckets request, so rather
 	// than failing with UnknownAPIRequest we simply handle it for now.
 	api.Methods(http.MethodGet).Path(SlashSeparator + SlashSeparator).HandlerFunc(
-		m.Handle(APIStats("listbuckets", h.ListBucketsHandler))).
+		m.Handle(h.ListBucketsHandler)).
 		Name("ListBuckets")
-
-	// If none of the routes match, add default error handler routes
-	api.NotFoundHandler = APIStats("notfound", errorResponseHandler)
-	api.MethodNotAllowedHandler = APIStats("methodnotallowed", errorResponseHandler)
 }

api/user_auth.go

@@ -19,9 +19,9 @@ var BoxData = KeyWrapper("__context_box_key")
 // ClientTime is an ID used to store client time.Time in a context.
 var ClientTime = KeyWrapper("__context_client_time")
 
-// AttachUserAuth adds user authentication via center to router using log for logging.
+// AuthMiddleware adds user authentication via center to router using log for logging.
-func AttachUserAuth(router *mux.Router, center auth.Center, log *zap.Logger) {
+func AuthMiddleware(log *zap.Logger, center auth.Center) mux.MiddlewareFunc {
-	router.Use(func(h http.Handler) http.Handler {
+	return func(h http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			var ctx context.Context
 			box, err := center.Authenticate(r)
@@ -46,5 +46,5 @@ func AttachUserAuth(router *mux.Router, center auth.Center, log *zap.Logger) {
 
 			h.ServeHTTP(w, r.WithContext(ctx))
 		})
-	})
+	}
 }