/
utils.go
94 lines (81 loc) · 2.28 KB
/
utils.go
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// Copyright (c) 2021 Terminus, Inc.
//
// This program is free software: you can use, redistribute, and/or modify
// it under the terms of the GNU Affero General Public License, version 3
// or later ("AGPL"), as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package collector
import (
"bytes"
"compress/gzip"
"encoding/base64"
"errors"
"io"
"io/ioutil"
"net/http"
"github.com/sirupsen/logrus"
)
func isJSONArray(b []byte) bool {
x := bytes.TrimLeft(b, " \t\r\n")
return len(x) > 0 && x[0] == '['
}
// ReadGzip .
func ReadGzip(body io.ReadCloser) ([]byte, error) {
gzipReader, err := gzip.NewReader(body)
if err != nil {
return []byte{}, err
}
defer gzipReader.Close()
return ioutil.ReadAll(gzipReader)
}
// ReadRequestBody .
func ReadRequestBody(req *http.Request) ([]byte, error) {
defer func() {
req.Body.Close()
}()
reader, err := getBodyReader(req)
if err != nil {
return []byte{}, err
}
reader, err = getCustomEncodingReader(req, reader)
if err != nil {
return []byte{}, err
}
res, err := ioutil.ReadAll(reader)
return res, err
}
// ReadRequestBodyReader .
func ReadRequestBodyReader(req *http.Request) (io.Reader, error) {
reader, err := getBodyReader(req)
if err != nil {
return nil, err
}
return getCustomEncodingReader(req, reader)
}
func getCustomEncodingReader(req *http.Request, reader io.Reader) (io.Reader, error) {
ccEncoding := req.Header.Get("Custom-Content-Encoding")
logrus.Debugf("read Custom-Content-Encoding: %s", ccEncoding)
if ccEncoding == "" {
return reader, nil
} else if ccEncoding == "base64" {
return base64.NewDecoder(base64.StdEncoding, reader), nil
}
return nil, errors.New("unsupported custom-content-encoding")
}
func getBodyReader(req *http.Request) (io.Reader, error) {
contentEncoding := req.Header.Get("Content-Encoding")
if contentEncoding == "gzip" {
gzipReader, err := gzip.NewReader(req.Body)
if err != nil {
return nil, err
}
return gzipReader, nil
}
return req.Body, nil
}