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translator_http.go
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/
translator_http.go
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package traproxy
import (
"bytes"
"sync"
"github.com/nyushi/traproxy/http"
)
// HTTPTranslator is translator for http connection
type HTTPTranslator struct {
TranslatorBase
buf []byte
processingRequest *http.RequestHeader
}
func (t *HTTPTranslator) filterRequest(in []byte) []byte {
t.buf = append(t.buf, in...)
out := []byte{}
for {
if t.processingRequest == nil {
rest, req, err := http.ReadRequestHeader(t.buf)
t.buf = rest
if err != nil {
break
}
if req == nil {
break
}
t.processingRequest = req
hasHostHeader := false
for _, h := range req.Headers {
if bytes.Equal(bytes.ToLower(h[0]), []byte("host")) {
hasHostHeader = true
req.SetRequestURI("http://" + string(h[1]) + string(req.ReqLineTokens[1]))
break
}
}
if !hasHostHeader {
req.SetRequestURI("http://" + t.Dst + string(req.ReqLineTokens[1]))
}
out = append(out, req.Bytes()...)
}
if t.processingRequest != nil {
rest, body := http.ReadRequestBody(t.buf, t.processingRequest)
t.buf = rest
if t.processingRequest.IsCompleted() {
t.processingRequest = nil
}
out = append(out, body...)
}
if len(t.buf) == 0 {
break
}
}
return out
}
// Start starts translation for http
func (t *HTTPTranslator) Start() error {
t.buf = []byte{}
client, proxy, err := t.CheckSockets()
if err != nil {
return err
}
wg := sync.WaitGroup{}
wg.Add(2)
go func() {
defer wg.Done()
defer t.HandlePanic()
Pipe(client, proxy, nil)
}()
go func() {
defer wg.Done()
defer t.HandlePanic()
f := t.filterRequest
Pipe(proxy, client, &f)
}()
wg.Wait()
return nil
}