Refacture structure proposal. (#1793)

command/client-s3-trace_v2.go

@@ -0,0 +1,91 @@
+/*
+ * Minio Client (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package command
+
+import (
+	"bytes"
+	"net/http"
+	"net/http/httputil"
+	"strings"
+
+	"github.com/minio/mc/pkg/console"
+	"github.com/minio/mc/pkg/httptracer"
+)
+
+// traceV2 - tracing structure for signature version '2'.
+type traceV2 struct{}
+
+// newTraceV2 - initialize Trace structure
+func newTraceV2() httptracer.HTTPTracer {
+	return traceV2{}
+}
+
+// Request - Trace HTTP Request
+func (t traceV2) Request(req *http.Request) (err error) {
+	origAuth := req.Header.Get("Authorization")
+
+	if strings.TrimSpace(origAuth) != "" {
+		// Authorization (S3 v2 signature) Format:
+		// Authorization: AWS AKIAJVA5BMMU2RHO6IO1:Y10YHUZ0DTUterAUI6w3XKX7Iqk=
+
+		// Set a temporary redacted auth
+		req.Header.Set("Authorization", "AWS **REDACTED**:**REDACTED**")
+
+		var reqTrace []byte
+		reqTrace, err = httputil.DumpRequestOut(req, false) // Only display header
+		if err == nil {
+			console.Debug(string(reqTrace))
+		}
+
+		// Undo
+		req.Header.Set("Authorization", origAuth)
+	}
+	return err
+}
+
+// Response - Trace HTTP Response
+func (t traceV2) Response(resp *http.Response) (err error) {
+	var respTrace []byte
+	// For errors we make sure to dump response body as well.
+	if resp.StatusCode != http.StatusOK &&
+		resp.StatusCode != http.StatusPartialContent &&
+		resp.StatusCode != http.StatusNoContent {
+		respTrace, err = httputil.DumpResponse(resp, true)
+	} else {
+		// WORKAROUND for https://github.com/golang/go/issues/13942.
+		// httputil.DumpResponse does not print response headers for
+		// all successful calls which have response ContentLength set
+		// to zero. Keep this workaround until the above bug is fixed.
+		if resp.ContentLength == 0 {
+			var buffer bytes.Buffer
+			if err = resp.Header.Write(&buffer); err != nil {
+				return err
+			}
+			respTrace = buffer.Bytes()
+			respTrace = append(respTrace, []byte("\r\n")...)
+		} else {
+			respTrace, err = httputil.DumpResponse(resp, false)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	if err == nil {
+		console.Debug(string(respTrace))
+	}
+	return err
+}