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/*
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* MinIO Cloud Storage, (C) 2018, 2019 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package logger
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import (
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"bytes"
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"fmt"
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"io"
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"net/http"
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"time"
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"github.com/gorilla/mux"
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"github.com/minio/minio/cmd/logger/message/audit"
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)
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// ResponseWriter - is a wrapper to trap the http response status code.
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type ResponseWriter struct {
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http.ResponseWriter
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StatusCode int
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// Response body should be logged
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LogBody bool
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TimeToFirstByte time.Duration
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StartTime time.Time
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// number of bytes written
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bytesWritten int
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// Internal recording buffer
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headers bytes.Buffer
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body bytes.Buffer
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// Indicate if headers are written in the log
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headersLogged bool
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}
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// NewResponseWriter - returns a wrapped response writer to trap
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// http status codes for auditiing purposes.
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func NewResponseWriter(w http.ResponseWriter) *ResponseWriter {
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return &ResponseWriter{
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ResponseWriter: w,
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StatusCode: http.StatusOK,
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StartTime: time.Now().UTC(),
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}
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}
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func (lrw *ResponseWriter) Write(p []byte) (int, error) {
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n, err := lrw.ResponseWriter.Write(p)
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lrw.bytesWritten += n
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if lrw.TimeToFirstByte == 0 {
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lrw.TimeToFirstByte = time.Now().UTC().Sub(lrw.StartTime)
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}
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if !lrw.headersLogged {
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// We assume the response code to be '200 OK' when WriteHeader() is not called,
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// that way following Golang HTTP response behavior.
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lrw.writeHeaders(&lrw.headers, http.StatusOK, lrw.Header())
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lrw.headersLogged = true
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}
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if lrw.StatusCode >= http.StatusBadRequest || lrw.LogBody {
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// Always logging error responses.
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lrw.body.Write(p)
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}
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if err != nil {
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return n, err
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}
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return n, err
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}
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// Write the headers into the given buffer
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func (lrw *ResponseWriter) writeHeaders(w io.Writer, statusCode int, headers http.Header) {
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n, _ := fmt.Fprintf(w, "%d %s\n", statusCode, http.StatusText(statusCode))
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lrw.bytesWritten += n
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for k, v := range headers {
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n, _ := fmt.Fprintf(w, "%s: %s\n", k, v[0])
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lrw.bytesWritten += n
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}
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}
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// BodyPlaceHolder returns a dummy body placeholder
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var BodyPlaceHolder = []byte("<BODY>")
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// Body - Return response body.
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func (lrw *ResponseWriter) Body() []byte {
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// If there was an error response or body logging is enabled
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// then we return the body contents
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if lrw.StatusCode >= http.StatusBadRequest || lrw.LogBody {
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return lrw.body.Bytes()
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}
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// ... otherwise we return the <BODY> place holder
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return BodyPlaceHolder
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}
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// WriteHeader - writes http status code
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func (lrw *ResponseWriter) WriteHeader(code int) {
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lrw.StatusCode = code
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if !lrw.headersLogged {
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lrw.writeHeaders(&lrw.headers, code, lrw.ResponseWriter.Header())
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lrw.headersLogged = true
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}
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lrw.ResponseWriter.WriteHeader(code)
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}
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// Flush - Calls the underlying Flush.
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func (lrw *ResponseWriter) Flush() {
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lrw.ResponseWriter.(http.Flusher).Flush()
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}
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// Size - reutrns the number of bytes written
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func (lrw *ResponseWriter) Size() int {
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return lrw.bytesWritten
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}
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// AuditTargets is the list of enabled audit loggers
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var AuditTargets = []Target{}
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// AddAuditTarget adds a new audit logger target to the
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// list of enabled loggers
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func AddAuditTarget(t Target) {
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AuditTargets = append(AuditTargets, t)
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}
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// AuditLog - logs audit logs to all audit targets.
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func AuditLog(w http.ResponseWriter, r *http.Request, api string, reqClaims map[string]interface{}) {
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var statusCode int
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var timeToResponse time.Duration
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var timeToFirstByte time.Duration
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lrw, ok := w.(*ResponseWriter)
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if ok {
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statusCode = lrw.StatusCode
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timeToResponse = time.Now().UTC().Sub(lrw.StartTime)
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timeToFirstByte = lrw.TimeToFirstByte
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}
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vars := mux.Vars(r)
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bucket := vars["bucket"]
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object := vars["object"]
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// Send audit logs only to http targets.
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for _, t := range AuditTargets {
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entry := audit.ToEntry(w, r, reqClaims, globalDeploymentID)
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entry.API.Name = api
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entry.API.Bucket = bucket
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entry.API.Object = object
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entry.API.Status = http.StatusText(statusCode)
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entry.API.StatusCode = statusCode
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entry.API.TimeToFirstByte = timeToFirstByte.String()
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entry.API.TimeToResponse = timeToResponse.String()
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_ = t.Send(entry, string(All))
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}
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}
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