mirror of https://github.com/minio/minio.git
130 lines
3.7 KiB
Go
130 lines
3.7 KiB
Go
// Copyright (c) 2015-2022 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package http
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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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)
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// ResponseRecorder - is a wrapper to trap the http response
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// status code and to record the response body
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type ResponseRecorder 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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// number of bytes of response headers written
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headerBytesWritten 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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// NewResponseRecorder - returns a wrapped response writer to trap
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// http status codes for auditing purposes.
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func NewResponseRecorder(w http.ResponseWriter) *ResponseRecorder {
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return &ResponseRecorder{
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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 *ResponseRecorder) Write(p []byte) (int, error) {
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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.WriteHeader(http.StatusOK)
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}
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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.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 *ResponseRecorder) 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.headerBytesWritten += 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.headerBytesWritten += 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 *ResponseRecorder) 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 *ResponseRecorder) WriteHeader(code int) {
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if !lrw.headersLogged {
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lrw.StatusCode = code
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lrw.writeHeaders(&lrw.headers, code, lrw.ResponseWriter.Header())
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lrw.headersLogged = true
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lrw.ResponseWriter.WriteHeader(code)
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}
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}
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// Flush - Calls the underlying Flush.
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func (lrw *ResponseRecorder) Flush() {
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lrw.ResponseWriter.(http.Flusher).Flush()
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}
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// Size - returns the number of bytes written
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func (lrw *ResponseRecorder) Size() int {
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return lrw.bytesWritten
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}
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// HeaderSize - returns the number of bytes of response headers written
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func (lrw *ResponseRecorder) HeaderSize() int {
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return lrw.headerBytesWritten
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}
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