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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package nat

import (
    "fmt"
    "io"
    "net"
    "net/http"
    "strings"
    "testing"

    "github.com/huin/goupnp/httpu"
)

func TestUPNP_DDWRT(t *testing.T) {
    dev := &fakeIGD{
        t: t,
        ssdpResp: "HTTP/1.1 200 OK\r\n" +
            "Cache-Control: max-age=300\r\n" +
            "Date: Sun, 10 May 2015 10:05:33 GMT\r\n" +
            "Ext: \r\n" +
            "Location: http://{{listenAddr}}/InternetGatewayDevice.xml\r\n" +
            "Server: POSIX UPnP/1.0 DD-WRT Linux/V24\r\n" +
            "ST: urn:schemas-upnp-org:device:WANConnectionDevice:1\r\n" +
            "USN: uuid:CB2471CC-CF2E-9795-8D9C-E87B34C16800::urn:schemas-upnp-org:device:WANConnectionDevice:1\r\n" +
            "\r\n",
        httpResps: map[string]string{
            "GET /InternetGatewayDevice.xml": `
                 <?xml version="1.0"?>
                 <root xmlns="urn:schemas-upnp-org:device-1-0">
                     <specVersion>
                         <major>1</major>
                         <minor>0</minor>
                     </specVersion>
                     <device>
                         <deviceType>urn:schemas-upnp-org:device:InternetGatewayDevice:1</deviceType>
                         <manufacturer>DD-WRT</manufacturer>
                         <manufacturerURL>http://www.dd-wrt.com</manufacturerURL>
                         <modelDescription>Gateway</modelDescription>
                         <friendlyName>Asus RT-N16:DD-WRT</friendlyName>
                         <modelName>Asus RT-N16</modelName>
                         <modelNumber>V24</modelNumber>
                         <serialNumber>0000001</serialNumber>
                         <modelURL>http://www.dd-wrt.com</modelURL>
                         <UDN>uuid:A13AB4C3-3A14-E386-DE6A-EFEA923A06FE</UDN>
                         <serviceList>
                             <service>
                                 <serviceType>urn:schemas-upnp-org:service:Layer3Forwarding:1</serviceType>
                                 <serviceId>urn:upnp-org:serviceId:L3Forwarding1</serviceId>
                                 <SCPDURL>/x_layer3forwarding.xml</SCPDURL>
                                 <controlURL>/control?Layer3Forwarding</controlURL>
                                 <eventSubURL>/event?Layer3Forwarding</eventSubURL>
                             </service>
                         </serviceList>
                         <deviceList>
                             <device>
                                 <deviceType>urn:schemas-upnp-org:device:WANDevice:1</deviceType>
                                 <friendlyName>WANDevice</friendlyName>
                                 <manufacturer>DD-WRT</manufacturer>
                                 <manufacturerURL>http://www.dd-wrt.com</manufacturerURL>
                                 <modelDescription>Gateway</modelDescription>
                                 <modelName>router</modelName>
                                 <modelURL>http://www.dd-wrt.com</modelURL>
                                 <UDN>uuid:48FD569B-F9A9-96AE-4EE6-EB403D3DB91A</UDN>
                                 <serviceList>
                                     <service>
                                         <serviceType>urn:schemas-upnp-org:service:WANCommonInterfaceConfig:1</serviceType>
                                         <serviceId>urn:upnp-org:serviceId:WANCommonIFC1</serviceId>
                                         <SCPDURL>/x_wancommoninterfaceconfig.xml</SCPDURL>
                                         <controlURL>/control?WANCommonInterfaceConfig</controlURL>
                                         <eventSubURL>/event?WANCommonInterfaceConfig</eventSubURL>
                                     </service>
                                 </serviceList>
                                 <deviceList>
                                     <device>
                                         <deviceType>urn:schemas-upnp-org:device:WANConnectionDevice:1</deviceType>
                                         <friendlyName>WAN Connection Device</friendlyName>
                                         <manufacturer>DD-WRT</manufacturer>
                                         <manufacturerURL>http://www.dd-wrt.com</manufacturerURL>
                                         <modelDescription>Gateway</modelDescription>
                                         <modelName>router</modelName>
                                         <modelURL>http://www.dd-wrt.com</modelURL>
                                         <UDN>uuid:CB2471CC-CF2E-9795-8D9C-E87B34C16800</UDN>
                                         <serviceList>
                                             <service>
                                                 <serviceType>urn:schemas-upnp-org:service:WANIPConnection:1</serviceType>
                                                 <serviceId>urn:upnp-org:serviceId:WANIPConn1</serviceId>
                                                 <SCPDURL>/x_wanipconnection.xml</SCPDURL>
                                                 <controlURL>/control?WANIPConnection</controlURL>
                                                 <eventSubURL>/event?WANIPConnection</eventSubURL>
                                             </service>
                                         </serviceList>
                                     </device>
                                 </deviceList>
                             </device>
                             <device>
                                 <deviceType>urn:schemas-upnp-org:device:LANDevice:1</deviceType>
                                 <friendlyName>LANDevice</friendlyName>
                                 <manufacturer>DD-WRT</manufacturer>
                                 <manufacturerURL>http://www.dd-wrt.com</manufacturerURL>
                                 <modelDescription>Gateway</modelDescription>
                                 <modelName>router</modelName>
                                 <modelURL>http://www.dd-wrt.com</modelURL>
                                 <UDN>uuid:04021998-3B35-2BDB-7B3C-99DA4435DA09</UDN>
                                 <serviceList>
                                     <service>
                                         <serviceType>urn:schemas-upnp-org:service:LANHostConfigManagement:1</serviceType>
                                         <serviceId>urn:upnp-org:serviceId:LANHostCfg1</serviceId>
                                         <SCPDURL>/x_lanhostconfigmanagement.xml</SCPDURL>
                                         <controlURL>/control?LANHostConfigManagement</controlURL>
                                         <eventSubURL>/event?LANHostConfigManagement</eventSubURL>
                                     </service>
                                 </serviceList>
                             </device>
                         </deviceList>
                         <presentationURL>http://{{listenAddr}}</presentationURL>
                     </device>
                 </root>
            `,
            // The response to our GetNATRSIPStatus call. This
            // particular implementation has a bug where the elements
            // inside u:GetNATRSIPStatusResponse are not properly
            // namespaced.
            "POST /control?WANIPConnection": `
                 <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
                 <s:Body>
                 <u:GetNATRSIPStatusResponse xmlns:u="urn:schemas-upnp-org:service:WANIPConnection:1">
                 <NewRSIPAvailable>0</NewRSIPAvailable>
                 <NewNATEnabled>1</NewNATEnabled>
                 </u:GetNATRSIPStatusResponse>
                 </s:Body>
                 </s:Envelope>
            `,
        },
    }
    if err := dev.listen(); err != nil {
        t.Skipf("cannot listen: %v", err)
    }
    dev.serve()
    defer dev.close()

    // Attempt to discover the fake device.
    discovered := discoverUPnP()
    if discovered == nil {
        t.Fatalf("not discovered")
    }
    upnp, _ := discovered.(*upnp)
    if upnp.service != "IGDv1-IP1" {
        t.Errorf("upnp.service mismatch: got %q, want %q", upnp.service, "IGDv1-IP1")
    }
    wantURL := "http://" + dev.listener.Addr().String() + "/InternetGatewayDevice.xml"
    if upnp.dev.URLBaseStr != wantURL {
        t.Errorf("upnp.dev.URLBaseStr mismatch: got %q, want %q", upnp.dev.URLBaseStr, wantURL)
    }
}

// fakeIGD presents itself as a discoverable UPnP device which sends
// canned responses to HTTPU and HTTP requests.
type fakeIGD struct {
    t *testing.T // for logging

    listener      net.Listener
    mcastListener *net.UDPConn

    // This should be a complete HTTP response (including headers).
    // It is sent as the response to any sspd packet. Any occurrence
    // of "{{listenAddr}}" is replaced with the actual TCP listen
    // address of the HTTP server.
    ssdpResp string
    // This one should contain XML payloads for all requests
    // performed. The keys contain method and path, e.g. "GET /foo/bar".
    // As with ssdpResp, "{{listenAddr}}" is replaced with the TCP
    // listen address.
    httpResps map[string]string
}

// httpu.Handler
func (dev *fakeIGD) ServeMessage(r *http.Request) {
    dev.t.Logf(`HTTPU request %s %s`, r.Method, r.RequestURI)
    conn, err := net.Dial("udp4", r.RemoteAddr)
    if err != nil {
        fmt.Printf("reply Dial error: %v", err)
        return
    }
    defer conn.Close()
    io.WriteString(conn, dev.replaceListenAddr(dev.ssdpResp))
}

// http.Handler
func (dev *fakeIGD) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    if resp, ok := dev.httpResps[r.Method+" "+r.RequestURI]; ok {
        dev.t.Logf(`HTTP request "%s %s" --> %d`, r.Method, r.RequestURI, 200)
        io.WriteString(w, dev.replaceListenAddr(resp))
    } else {
        dev.t.Logf(`HTTP request "%s %s" --> %d`, r.Method, r.RequestURI, 404)
        w.WriteHeader(http.StatusNotFound)
    }
}

func (dev *fakeIGD) replaceListenAddr(resp string) string {
    return strings.Replace(resp, "{{listenAddr}}", dev.listener.Addr().String(), -1)
}

func (dev *fakeIGD) listen() (err error) {
    if dev.listener, err = net.Listen("tcp", "127.0.0.1:0"); err != nil {
        return err
    }
    laddr := &net.UDPAddr{IP: net.ParseIP("239.255.255.250"), Port: 1900}
    if dev.mcastListener, err = net.ListenMulticastUDP("udp", nil, laddr); err != nil {
        dev.listener.Close()
        return err
    }
    return nil
}

func (dev *fakeIGD) serve() {
    go httpu.Serve(dev.mcastListener, dev)
    go http.Serve(dev.listener, dev)
}

func (dev *fakeIGD) close() {
    dev.mcastListener.Close()
    dev.listener.Close()
}