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package main
import (
"crypto/sha256"
"encoding/base32"
"encoding/base64"
"encoding/binary"
"encoding/hex"
"fmt"
log "github.com/sirupsen/logrus"
"go.mongodb.org/mongo-driver/bson/primitive"
"io"
"net"
"os"
"time"
"net/http"
"bufio"
"strings"
"io/ioutil"
"compress/gzip"
)
func Sha256Sum(fileName string) (string, error) {
f, err := os.Open(fileName)
if err != nil {
return "", err
}
defer func() {
err = f.Close()
if err != nil {
log.WithError(err).WithField("filename", fileName).Error("failed to close file")
}
}()
h := sha256.New()
if _, err := io.Copy(h, f); err != nil {
return "", err
}
return fmt.Sprintf("%x", h.Sum(nil)), nil
}
func CustomRowID(payload uint64, timestamp time.Time) RowID {
var key [12]byte
binary.BigEndian.PutUint32(key[0:4], uint32(timestamp.Unix()))
binary.BigEndian.PutUint64(key[4:12], payload)
if oid, err := primitive.ObjectIDFromHex(hex.EncodeToString(key[:])); err == nil {
return oid
} else {
log.WithError(err).Warn("failed to create object id")
return primitive.NewObjectID()
}
}
func NewRowID() RowID {
return primitive.NewObjectID()
}
func EmptyRowID() RowID {
return [12]byte{}
}
func RowIDFromHex(hex string) (RowID, error) {
rowID, err := primitive.ObjectIDFromHex(hex)
return rowID, err
}
func FileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
func FileSize(filename string) int64 {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return -1
}
return info.Size()
}
func byID(id RowID) OrderedDocument {
return OrderedDocument{{"_id", id}}
}
func DecodeBytes(buffer []byte, format string) string {
switch format {
case "hex":
return hex.EncodeToString(buffer)
case "hexdump":
return hex.Dump(buffer)
case "base32":
return base32.StdEncoding.EncodeToString(buffer)
case "base64":
return base64.StdEncoding.EncodeToString(buffer)
case "ascii":
str := fmt.Sprintf("%+q", buffer)
return str[1 : len(str)-1]
case "binary":
str := fmt.Sprintf("%b", buffer)
return str[1 : len(str)-1]
case "decimal":
str := fmt.Sprintf("%d", buffer)
return str[1 : len(str)-1]
case "octal":
str := fmt.Sprintf("%o", buffer)
return str[1 : len(str)-1]
default:
return string(buffer)
}
}
func ReadRequest(raw string) http.Request {
reader := bufio.NewReader(strings.NewReader(raw))
req,err := http.ReadRequest(reader)
if err != nil{
log.Info("Reading request: ",req)
return http.Request{}
}
return *req
}
func GetHeader(raw string) string{
tmp := strings.Split(raw,"\r\n")
end := len(tmp)
for i, line := range tmp{
if line == ""{
end = i
break
}
}
return strings.Join(tmp[:end],"\r\n")
}
func GetBody(raw string) string{
tmp := strings.Split(raw,"\r\n")
start := 0
for i, line := range tmp{
if line == ""{
start = i + 2
break
}
}
return strings.Join(tmp[start:],"\r\n")
}
func DecodeHttpResponse(raw string) string {
body := []byte{}
reader := bufio.NewReader(strings.NewReader(raw))
resp,err := http.ReadResponse(reader, &http.Request{})
if err != nil{
log.Info("Reading response: ",resp)
return ""
}
defer resp.Body.Close()
if resp.StatusCode >= 200 && resp.StatusCode < 300 {
var bodyReader io.ReadCloser
switch resp.Header.Get("Content-Encoding") {
case "gzip":
bodyReader, err = gzip.NewReader(resp.Body)
if err != nil {
log.Error("Gunzipping body: ",err)
}
defer bodyReader.Close()
body, err = ioutil.ReadAll(bodyReader)
if err != nil{
log.Error("Reading gzipped body: ",err)
// if the response is malformed
// or the connection is closed
fallbackReader, _ := gzip.NewReader(strings.NewReader(GetBody(raw)))
body, err = ioutil.ReadAll(fallbackReader)
if err != nil{
log.Error(string(body))
}
}
default:
bodyReader = resp.Body
body, err = ioutil.ReadAll(bodyReader)
if err != nil{
log.Error("Reading body: ",err)
body = []byte(GetBody(raw))
}
}
}
return GetHeader(raw) + "\r\n\r\n"+ string(body)
}
func CopyFile(dst, src string) error {
in, err := os.Open(src)
if err != nil {
return err
}
out, err := os.Create(dst)
if err != nil {
return err
}
if _, err = io.Copy(out, in); err != nil {
return err
}
if err := in.Close(); err != nil {
return err
}
return out.Close()
}
func ParseIPNet(address string) *net.IPNet {
_, network, err := net.ParseCIDR(address)
if err != nil {
ip := net.ParseIP(address)
if ip == nil {
return nil
}
size := 0
if ip.To4() != nil {
size = 32
} else {
size = 128
}
network = &net.IPNet{
IP: ip,
Mask: net.CIDRMask(size, size),
}
}
return network
}
|
