Get Endpoint Address for suggestion form

go.mod

@@ -3,6 +3,7 @@ module github.com/ngoduykhanh/wireguard-ui
 go 1.14
 
 require (
+	github.com/glendc/go-external-ip v0.0.0-20170425150139-139229dcdddd
 	github.com/go-playground/universal-translator v0.17.0 // indirect
 	github.com/jcelliott/lumber v0.0.0-20160324203708-dd349441af25 // indirect
 	github.com/labstack/echo/v4 v4.1.16

go.sum

@@ -1,6 +1,8 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/glendc/go-external-ip v0.0.0-20170425150139-139229dcdddd h1:1BzxHapafGJd/XlpMvocLeDBin2EKn90gXv2AQt5sfo=
+github.com/glendc/go-external-ip v0.0.0-20170425150139-139229dcdddd/go.mod h1:o9OoDQyE1WHvYVUH1FdFapy1/rCZHHq3O5wS4VA83ig=
 github.com/go-playground/locales v0.13.0 h1:HyWk6mgj5qFqCT5fjGBuRArbVDfE4hi8+e8ceBS/t7Q=
 github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
 github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD876Lmtgy7VtROAbHHXk8no=

handler/routes.go

@@ -281,3 +281,25 @@ func GlobalSettingSubmit() echo.HandlerFunc {
 		return c.JSON(http.StatusOK, jsonHTTPResponse{true, "Updated global settings successfully"})
 	}
 }
+
+// MachineIPAddresses handler to get local interface ip addresses
+func MachineIPAddresses() echo.HandlerFunc {
+	return func(c echo.Context) error {
+		// get private ip addresses
+		interfaceList, err := util.GetInterfaceIPs()
+		if err != nil {
+			return c.JSON(http.StatusInternalServerError, jsonHTTPResponse{false, "Cannot get machine ip addresses"})
+		}
+
+		// get public ip address
+		// TODO: Remove the go-external-ip dependency
+		publicInterface, err := util.GetPublicIP()
+		if err != nil {
+			log.Warn("Cannot get machine public ip address: ", err)
+		} else {
+			interfaceList = append(interfaceList, publicInterface)
+		}
+
+		return c.JSON(http.StatusOK, interfaceList)
+	}
+}

main.go

@@ -16,5 +16,6 @@ func main() {
 	app.POST("wg-server/keypair", handler.WireGuardServerKeyPair())
 	app.GET("/global-settings", handler.GlobalSettings())
 	app.POST("/global-settings", handler.GlobalSettingSubmit())
+	app.GET("/api/machine-ips", handler.MachineIPAddresses())
 	app.Logger.Fatal(app.Start("127.0.0.1:5000"))
 }

model/misc.go

@@ -0,0 +1,7 @@
+package model
+
+// Interface model
+type Interface struct {
+	Name      string `json:"name"`
+	IPAddress string `json:"ip_address"`
+}

templates/global_settings.html

@@ -27,8 +27,15 @@ Global Settings
                         <div class="card-body">
                             <div class="form-group">
                                 <label for="endpoint_address">Endpoint Address</label>
-                                <input type="text" class="form-control" id="endpoint_address" name="endpoint_address" placeholder="Endpoint Address"
-                                    value="{{ .globalSettings.EndpointAddress }}">
+                                <div class="input-group input-group">
+                                    <input type="text" class="form-control" id="endpoint_address" name="endpoint_address" placeholder="Endpoint Address"
+                                        value="{{ .globalSettings.EndpointAddress }}">
+                                    <span class="input-group-append">
+                                        <button type="button" class="btn btn-success btn-flat" data-toggle="modal"
+                                            data-target="#modal_endpoint_address_suggestion"><i
+                                                class="nav-icon fas fa-magic"></i> Suggest</button>
+                                    </span>
+                                </div>
                             </div>
                             <div class="form-group">
                                 <label for="dns_servers" class="control-label">DNS Servers</label>
@@ -60,6 +67,31 @@ Global Settings
     </div>
 </section>
 
+<div class="modal fade" id="modal_endpoint_address_suggestion">
+    <div class="modal-dialog">
+        <div class="modal-content">
+            <div class="modal-header">
+                <h4 class="modal-title">Endpoint Address Suggestion</h4>
+                <button type="button" class="close" data-dismiss="modal" aria-label="Close">
+                    <span aria-hidden="true">&times;</span>
+                </button>
+            </div>
+            <div class="modal-body">
+                <p>Following is the list of public and local IP addresses for your consideration.</p>
+                <select id="ip_suggestion" class="select2"
+                    data-placeholder="Select an IP address" style="width: 100%;">
+                </select>
+            </div>
+            <div class="modal-footer justify-content-between">
+                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
+                <button type="button" class="btn btn-success" id="btn_use_ip" disabled>Use selected IP address</button>
+            </div>
+        </div>
+        <!-- /.modal-content -->
+    </div>
+    <!-- /.modal-dialog -->
+</div>
+<!-- /.modal -->
 {{end}}
 
 {{define "bottom_js"}}
@@ -88,6 +120,20 @@ Global Settings
                 }
             });
         }
+
+        function updateEndpointSuggestionIP() {
+            $.getJSON("/api/machine-ips", null, function(data) {
+                $("#ip_suggestion option").remove();
+                $.each(data, function(index, item) {
+                    $("#ip_suggestion").append(
+                        $("<option></option>")
+                            .text(item.ip_address + ' on ' + item.name)
+                            .val(item.ip_address)
+                    );
+                });
+                document.getElementById("btn_use_ip").disabled = false;
+            });
+        }
     </script>
     <script>
         // Wireguard Interface DNS server tag input
@@ -150,5 +196,21 @@ Global Settings
                 }
             });
         });
+
+        // Endpoint IP suggestion modal event
+        $(document).ready(function () {
+            $('#modal_endpoint_address_suggestion').on('shown.bs.modal', function (e) {
+                updateEndpointSuggestionIP();
+            });
+        });
+
+        // Use selected IP address from suggestion form
+        $(document).ready(function () {
+            $('#btn_use_ip').click(function () {
+                var ip = $('#ip_suggestion').select2('val');
+                $('#endpoint_address').val(ip);
+                $('#modal_endpoint_address_suggestion').modal('hide');
+            });
+        });
     </script>
 {{end}}

util/util.go

@@ -4,7 +4,9 @@ import (
 	"fmt"
 	"net"
 	"strings"
+	"time"
 
+	externalip "github.com/glendc/go-external-ip"
 	"github.com/ngoduykhanh/wireguard-ui/model"
 )
 
@@ -87,3 +89,68 @@ func ValidateIPAddressList(ips []string) bool {
 	}
 	return true
 }
+
+// GetInterfaceIPs to get local machine's interface ip addresses
+func GetInterfaceIPs() ([]model.Interface, error) {
+	// get machine's interfaces
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+
+	var interfaceList = []model.Interface{}
+
+	// get interface's ip addresses
+	for _, i := range ifaces {
+		addrs, err := i.Addrs()
+		if err != nil {
+			return nil, err
+		}
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+			if ip == nil || ip.IsLoopback() {
+				continue
+			}
+			ip = ip.To4()
+			if ip == nil {
+				continue
+			}
+
+			iface := model.Interface{}
+			iface.Name = i.Name
+			iface.IPAddress = ip.String()
+			interfaceList = append(interfaceList, iface)
+		}
+	}
+	return interfaceList, err
+}
+
+// GetPublicIP to get machine's public ip address
+func GetPublicIP() (model.Interface, error) {
+	// set time out to 5 seconds
+	cfg := externalip.ConsensusConfig{}
+	cfg.Timeout = time.Second * 5
+	consensus := externalip.NewConsensus(&cfg, nil)
+
+	// add trusted voters
+	consensus.AddVoter(externalip.NewHTTPSource("http://checkip.amazonaws.com/"), 1)
+	consensus.AddVoter(externalip.NewHTTPSource("http://whatismyip.akamai.com"), 1)
+	consensus.AddVoter(externalip.NewHTTPSource("http://ifconfig.top"), 1)
+
+	publicInterface := model.Interface{}
+	publicInterface.Name = "Public"
+
+	ip, err := consensus.ExternalIP()
+	if err != nil {
+		publicInterface.IPAddress = "N/A"
+	}
+	publicInterface.IPAddress = ip.String()
+
+	return publicInterface, err
+}