A working proxy exists.

proxy/main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"context"
+	"ippserver/packages/ipp"
+	"ippserver/packages/mdnsserver"
+	"net/http"
+	"sync"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func main() {
+	customFormatter := new(log.TextFormatter)
+	customFormatter.TimestampFormat = "2006-01-02 15:04:05"
+	log.SetFormatter(customFormatter)
+	customFormatter.FullTimestamp = true
+	log.SetLevel(log.InfoLevel)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	go mdnsserver.Run(ctx)
+
+	http.HandleFunc("/ipp/print", handle)
+
+	log.Info("http server started on :1234")
+	err := http.ListenAndServe(":1234", nil)
+	if err != nil {
+		log.Fatal("ListenAndServe: " + err.Error())
+	}
+}
+
+var mut sync.Mutex
+var requestID uint32
+
+func handle(w http.ResponseWriter, r *http.Request) {
+	mut.Lock()
+	requestID++
+	mut.Unlock()
+	if r.Method != http.MethodPost {
+		http.Error(w, "Unsupported method", http.StatusMethodNotAllowed)
+
+	}
+	//log.Info(r.Header)
+	//body := make([]byte, r.ContentLength)
+	//io.ReadFull(r.Body, body)
+	//log.Infof("Body %x", body)
+
+	request := ipp.NewRequest(0, 0)
+	//rdata := make([]byte, r.ContentLength)
+	//io.ReadFull(r.Body, rdata)
+	//log.Printf("Data %x", rdata)
+	//fmt.Printf("data % #0x", rdata)
+	//buf := bytes.NewBuffer(rdata)
+	request.UnMarshal(r.Body)
+	log.Infof("Upstream Request: \n%v\n", request)
+	var response *ipp.Response
+	switch request.Operation() {
+	case ipp.GetPrinterAttributes:
+		response = handleGetPrinterAttributes(request)
+	case ipp.PrintJob:
+		response = handlePrintJob(request, r.Body, requestID)
+	case ipp.GetJobs:
+		response = handleGetJobs(request, requestID)
+	case ipp.ValidateJob:
+		response = handleValidateJob(request)
+	case ipp.GetJobAttributes:
+		response = handleGetJobAttributes(request, requestID)
+	default:
+		response = ipp.NewResponse(ipp.ClientErrorBadRequest, request.RequestID())
+	}
+
+	log.Infof("Upstream Response:\n%v\n", response)
+	data := response.Marshal()
+
+	//log.Debugf("% x", data)
+	w.Write(data)
+
+}