very basic test endpoint (#36)

cmd/zrok/endpoint_ui/index.html

@@ -27,15 +27,15 @@
                 display: flex;
                 flex-direction: column;
                 align-items: center;
-                height: 50vh;
+                height: 600px;
                 justify-content: center;
             }
             #banner h1 {
                 font-size: 64pt;
             }
             #info {
-                margin-left: 25px;
-                margin-right: 25px;
+                margin-left: 50px;
+                margin-right: 50px;
             }
         </style>
     </head>
@@ -43,10 +43,11 @@
         <div id="root">
             <div id="banner">
                 <img src="ziggy.svg" width="200"/>
-                <h1>zrok</h1>
+                <h1>zrok test endpoint</h1>
             </div>
             <div id="info">
-                <p>This is an HTTP server running at address:</p>
+                <h2>The Current Now is {{ .Now }}</h2>
+                <p>This host has these IP addresses: {{ .Ips }}</p>
             </div>
         </div>
     </body>

cmd/zrok/test.go

@@ -2,9 +2,13 @@ package main
 
 import (
 	"fmt"
+	"github.com/opentracing/opentracing-go/log"
 	"github.com/openziti-test-kitchen/zrok/cmd/zrok/endpoint_ui"
 	"github.com/spf13/cobra"
+	"html/template"
+	"net"
 	"net/http"
+	"time"
 )
 
 func init() {
@@ -20,6 +24,7 @@ var testCmd = &cobra.Command{
 type testEndpointCommand struct {
 	address string
 	port    uint16
+	t       *template.Template
 	cmd     *cobra.Command
 }
 
@@ -30,6 +35,10 @@ func newTestEndpointCommand() *testEndpointCommand {
 		Args:  cobra.ExactArgs(0),
 	}
 	command := &testEndpointCommand{cmd: cmd}
+	var err error
+	if command.t, err = template.ParseFS(endpoint_ui.FS, "index.html"); err != nil {
+		panic(err)
+	}
 	cmd.Flags().StringVarP(&command.address, "address", "a", "0.0.0.0", "The address for the HTTP listener")
 	cmd.Flags().Uint16VarP(&command.port, "port", "p", 9090, "The port for the HTTP listener")
 	cmd.Run = command.run
@@ -38,7 +47,39 @@ func newTestEndpointCommand() *testEndpointCommand {
 
 func (cmd *testEndpointCommand) run(_ *cobra.Command, _ []string) {
 	fs := http.FileServer(http.FS(endpoint_ui.FS))
-	if err := http.ListenAndServe(fmt.Sprintf("%v:%d", cmd.address, cmd.port), fs); err != nil {
+	http.HandleFunc("/", cmd.handleIndex)
+	http.HandleFunc("/index.html", cmd.handleIndex)
+	http.Handle("/ziggy.svg", fs)
+	if err := http.ListenAndServe(fmt.Sprintf("%v:%d", cmd.address, cmd.port), nil); err != nil {
 		panic(err)
 	}
 }
+
+func (cmd *testEndpointCommand) handleIndex(w http.ResponseWriter, r *http.Request) {
+	ed := &endpointData{
+		Now: time.Now(),
+	}
+	ed.getIps()
+	if err := cmd.t.Execute(w, ed); err != nil {
+		log.Error(err)
+	}
+}
+
+type endpointData struct {
+	Now time.Time
+	Ips string
+}
+
+func (ed *endpointData) getIps() {
+	addrs, err := net.InterfaceAddrs()
+	if err == nil {
+		for _, address := range addrs {
+			if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+				if len(ed.Ips) != 0 {
+					ed.Ips += ", "
+				}
+				ed.Ips += ipnet.IP.String()
+			}
+		}
+	}
+}