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main.go
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main.go
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package main
import (
"bytes"
"flag"
"fmt"
"io"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"github.com/OpenPrinting/goipp"
)
func main() {
var ipArg string
var port int
var instance string
var newHost string
var proxyHost string
flag.StringVar(&proxyHost, "printerHost", "http://192.168.1.77:631", "real host of the printer")
flag.StringVar(&ipArg, "newIP", "192.168.1.2", "new ip of the printer")
flag.IntVar(&port, "newPort", 631, "new port of the printer")
flag.StringVar(&newHost, "newHost", "A6PRINTER", "new host of the printer")
flag.StringVar(&instance, "instance", "a6printer", "name of the printer")
flag.Parse()
var txt []string
txt = append(txt, "txtvers=1")
txt = append(txt, "qtotal=1")
txt = append(txt, "pdl=application/octet-stream,image/urf,image/jpeg,image/pwg-raster")
txt = append(txt, "rp=ipp/print")
txt = append(txt, "note=")
txt = append(txt, "ty=Brother HL-L3230CDW series")
txt = append(txt, "product=(Brother HL-L3230CDW series)")
txt = append(txt, fmt.Sprintf("adminurl=http://%v.local.:%v/net/net/airprint.html", newHost, port))
txt = append(txt, "priority=25")
txt = append(txt, "usb_MFG=Brother")
txt = append(txt, "usb_MDL=HL-L3230CDW series")
txt = append(txt, "usb_CMD=PJL,PCL,PCLXL,URF")
txt = append(txt, "Color=T")
txt = append(txt, "Copies=T")
txt = append(txt, "Duplex=T")
txt = append(txt, "Fax=F")
txt = append(txt, "Scan=F")
txt = append(txt, "PaperCustom=T")
txt = append(txt, "Binary=T")
txt = append(txt, "Transparent=T")
txt = append(txt, "TBCP=F")
txt = append(txt, "URF=SRGB24,W8,CP1,IS4-1,MT1-3-4-5-8-11,OB10,PQ4,RS600,V1.4,DM1")
txt = append(txt, "kind=document,envelope,label,postcard")
txt = append(txt, "PaperMax=legal-A4")
txt = append(txt, "UUID=dbbd227c-d891-4474-9c92-7f20dcb234f4")
txt = append(txt, "print_wfds=T")
txt = append(txt, "mopria-certified=1.3")
var ips []net.IP
ip := net.ParseIP(ipArg)
ips = append(ips, ip)
service, err := NewMDNSService(instance, "_ipp._tcp", "", newHost+".local.", port, ips, txt)
if err != nil {
log.Fatalln(err)
}
// Create the mDNS server, defer shutdown
server, _ := NewServer(&Config{
Zone: service,
})
defer server.Shutdown()
// Create the IPP proxy
proxyHostURL, err := url.Parse(proxyHost)
if err != nil {
log.Fatalln(err)
}
rp := httputil.NewSingleHostReverseProxy(proxyHostURL)
rp.ModifyResponse = func(resp *http.Response) error {
if resp.Header.Get("Content-Type") != "application/ipp" {
return nil
}
var msg goipp.Message
if err := msg.Decode(resp.Body); err != nil {
return err
}
for i, group := range msg.Groups {
for j, attr := range group.Attrs {
if attr.Name == "media-col-ready" {
for k, value := range attr.Values {
if value.T != goipp.TagBeginCollection {
continue
}
log.Println("attr", i, j, k, attr.Name, attr.Values)
var mediaColReady goipp.Collection
for _, v := range value.V.(goipp.Collection) {
switch v.Name {
case "media-size":
var mediaSize goipp.Collection
mediaSize.Add(goipp.MakeAttribute("x-dimension", goipp.TagInteger, goipp.Integer(10500)))
mediaSize.Add(goipp.MakeAttribute("y-dimension", goipp.TagInteger, goipp.Integer(14800)))
mediaColReady.Add(goipp.MakeAttribute(v.Name, goipp.TagBeginCollection, mediaSize))
case "media-source":
mediaColReady.Add(goipp.MakeAttribute(v.Name, goipp.TagKeyword, goipp.String("manual")))
default:
mediaColReady.Add(v)
}
}
msg.Groups[i].Attrs[j].Values[k].V = mediaColReady
}
}
}
}
log.Println("Resp:", msg.Groups)
data, err := msg.EncodeBytes()
if err != nil {
return err
}
resp.Body = io.NopCloser(bytes.NewReader(data))
resp.Header.Set("Content-Length", fmt.Sprint(len(data)))
return nil
}
host := fmt.Sprintf("%v:%v", ipArg, port)
host80 := fmt.Sprintf("%v:%v", ipArg, 80)
log.Println("Reverse proxy:", host, "=>", proxyHost)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
log.Println("[http]", r.RequestURI)
rp.ServeHTTP(w, r)
})
go http.ListenAndServe(host, nil)
go http.ListenAndServe(host80, nil)
select {}
}