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package helper
import (
"bytes"
"errors"
"io/ioutil"
"mime"
"net"
"net/http"
"net/url"
"os"
"os/exec"
"strings"
"syscall"
"github.com/sebest/xff"
"gitlab.com/gitlab-org/labkit/log"
"gitlab.com/gitlab-org/labkit/mask"
)
const NginxResponseBufferHeader = "X-Accel-Buffering"
func logErrorWithFields(r *http.Request, err error, fields log.Fields) {
if err != nil {
CaptureRavenError(r, err, fields)
}
printError(r, err, fields)
}
func CaptureAndFail(w http.ResponseWriter, r *http.Request, err error, msg string, code int) {
http.Error(w, msg, code)
logErrorWithFields(r, err, nil)
}
func Fail500(w http.ResponseWriter, r *http.Request, err error) {
CaptureAndFail(w, r, err, "Internal server error", http.StatusInternalServerError)
}
func Fail500WithFields(w http.ResponseWriter, r *http.Request, err error, fields log.Fields) {
http.Error(w, "Internal server error", http.StatusInternalServerError)
logErrorWithFields(r, err, fields)
}
func RequestEntityTooLarge(w http.ResponseWriter, r *http.Request, err error) {
CaptureAndFail(w, r, err, "Request Entity Too Large", http.StatusRequestEntityTooLarge)
}
func printError(r *http.Request, err error, fields log.Fields) {
if r != nil {
entry := log.WithContextFields(r.Context(), log.Fields{
"method": r.Method,
"uri": mask.URL(r.RequestURI),
})
entry.WithFields(fields).WithError(err).Error()
} else {
log.WithFields(fields).WithError(err).Error("unknown error")
}
}
func SetNoCacheHeaders(header http.Header) {
header.Set("Cache-Control", "no-cache, no-store, max-age=0, must-revalidate")
header.Set("Pragma", "no-cache")
header.Set("Expires", "Fri, 01 Jan 1990 00:00:00 GMT")
}
func OpenFile(path string) (file *os.File, fi os.FileInfo, err error) {
file, err = os.Open(path)
if err != nil {
return
}
defer func() {
if err != nil {
file.Close()
}
}()
fi, err = file.Stat()
if err != nil {
return
}
// The os.Open can also open directories
if fi.IsDir() {
err = &os.PathError{
Op: "open",
Path: path,
Err: errors.New("path is directory"),
}
return
}
return
}
func URLMustParse(s string) *url.URL {
u, err := url.Parse(s)
if err != nil {
log.WithError(err).WithField("url", s).Fatal("urlMustParse")
}
return u
}
func HTTPError(w http.ResponseWriter, r *http.Request, error string, code int) {
if r.ProtoAtLeast(1, 1) {
// Force client to disconnect if we render request error
w.Header().Set("Connection", "close")
}
http.Error(w, error, code)
}
func HeaderClone(h http.Header) http.Header {
h2 := make(http.Header, len(h))
for k, vv := range h {
vv2 := make([]string, len(vv))
copy(vv2, vv)
h2[k] = vv2
}
return h2
}
func CleanUpProcessGroup(cmd *exec.Cmd) {
if cmd == nil {
return
}
process := cmd.Process
if process != nil && process.Pid > 0 {
// Send SIGTERM to the process group of cmd
syscall.Kill(-process.Pid, syscall.SIGTERM)
}
// reap our child process
cmd.Wait()
}
func ExitStatus(err error) (int, bool) {
exitError, ok := err.(*exec.ExitError)
if !ok {
return 0, false
}
waitStatus, ok := exitError.Sys().(syscall.WaitStatus)
if !ok {
return 0, false
}
return waitStatus.ExitStatus(), true
}
func DisableResponseBuffering(w http.ResponseWriter) {
w.Header().Set(NginxResponseBufferHeader, "no")
}
func AllowResponseBuffering(w http.ResponseWriter) {
w.Header().Del(NginxResponseBufferHeader)
}
func FixRemoteAddr(r *http.Request) {
// Unix domain sockets have a remote addr of @. This will make the
// xff package lookup the X-Forwarded-For address if available.
if r.RemoteAddr == "@" {
r.RemoteAddr = "127.0.0.1:0"
}
r.RemoteAddr = xff.GetRemoteAddr(r)
}
func SetForwardedFor(newHeaders *http.Header, originalRequest *http.Request) {
if clientIP, _, err := net.SplitHostPort(originalRequest.RemoteAddr); err == nil {
var header string
// If we aren't the first proxy retain prior
// X-Forwarded-For information as a comma+space
// separated list and fold multiple headers into one.
if prior, ok := originalRequest.Header["X-Forwarded-For"]; ok {
header = strings.Join(prior, ", ") + ", " + clientIP
} else {
header = clientIP
}
newHeaders.Set("X-Forwarded-For", header)
}
}
func IsContentType(expected, actual string) bool {
parsed, _, err := mime.ParseMediaType(actual)
return err == nil && parsed == expected
}
func IsApplicationJson(r *http.Request) bool {
contentType := r.Header.Get("Content-Type")
return IsContentType("application/json", contentType)
}
func ReadRequestBody(w http.ResponseWriter, r *http.Request, maxBodySize int64) ([]byte, error) {
limitedBody := http.MaxBytesReader(w, r.Body, maxBodySize)
defer limitedBody.Close()
return ioutil.ReadAll(limitedBody)
}
func CloneRequestWithNewBody(r *http.Request, body []byte) *http.Request {
newReq := *r
newReq.Body = ioutil.NopCloser(bytes.NewReader(body))
newReq.Header = HeaderClone(r.Header)
newReq.ContentLength = int64(len(body))
return &newReq
}
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