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27632ca6ec
ResponseWriter & RecordAPIStats has similar role, merge them. This commit will also fix wrong auditing for STS and Web and others since they are using ResponseWriter instead of the RecordAPIStats.
177 lines
4.8 KiB
Go
177 lines
4.8 KiB
Go
/*
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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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"net/url"
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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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// Log body of 4xx or 5xx responses
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LogErrBody bool
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// Log body of all responses
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LogAllBody 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.LogErrBody && lrw.StatusCode >= http.StatusBadRequest) || lrw.LogAllBody {
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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.LogErrBody && lrw.StatusCode >= http.StatusBadRequest) || lrw.LogAllBody {
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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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// Fast exit if there is not audit target configured
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if len(AuditTargets) == 0 {
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return
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}
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var (
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statusCode int
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timeToResponse time.Duration
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timeToFirstByte time.Duration
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)
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st, ok := w.(*ResponseWriter)
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if ok {
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statusCode = st.StatusCode
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timeToResponse = time.Now().UTC().Sub(st.StartTime)
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timeToFirstByte = st.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, err := url.PathUnescape(vars["object"])
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if err != nil {
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object = vars["object"]
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}
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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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// Send audit logs only to http targets.
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for _, t := range AuditTargets {
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_ = t.Send(entry, string(All))
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}
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}
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