@@ -13,7 +13,7 @@ if len(args) == 1 {
 		return false
 	}
 	switch args[1] {
-	case "register":
+	case "invite":
 		now := time.Now().UnixMicro()
 		strNow := strconv.FormatInt(now, 10)
 		self, err := crypto.Encrypt(strNow)

@@ -1,29 +1,48 @@ 
 package register
 
 import (
-	"context"
 	"crypto/aes"
 	"crypto/cipher"
 	"encoding/hex"
 	"html/template"
 	"net/http"
+	"time"
+	"strconv"
+	"fmt"
+	
 
 	"hacklab.nilfm.cc/quartzgun/auth"
 	"hacklab.nilfm.cc/quartzgun/renderer"
 	"hacklab.nilfm.cc/quartzgun/router"
+  "hacklab.nilfm.cc/quartzgun/util"
 )
 
-var bytes = []byte{99, 207, 33, 57, 28, 01, 50, 76, 01, 92, 33, 10, 48, 07, 00, 250}
-
 type SymmetricCrypto interface {
 	Encode(b []byte) string
 	Decode(s string) []byte
 	Encrypt(text string) (string, error)
 	Decrypt(text string) (string, error)
+	IsValid(text string) bool
 }
 
 type SymmetricCrypt struct {
 	Secret string
+}
+
+var iv []byte = []byte {107,  53,  46, 249,  52,  70,  36, 185,
+                        168, 139, 144, 249, 242,   2, 125, 183 }
+
+func (self *SymmetricCrypt) IsValid(cipher string) bool {
+  stringTimestamp, err := self.Decrypt(cipher)
+  if err != nil {
+    return false
+  }
+  int64Timestamp, err := strconv.ParseInt(stringTimestamp, 10, 64)
+  if err != nil {
+    return false
+  }
+  then := time.UnixMicro(int64Timestamp)
+  return time.Since(then).Minutes() <= 15
 }
 
 func (self *SymmetricCrypt) Encode(b []byte) string {
@@ -39,12 +58,13 @@ return data
 }
 
 func (self *SymmetricCrypt) Encrypt(text string) (string, error) {
+  fmt.Println(text)
 	block, err := aes.NewCipher([]byte(self.Secret))
 	if err != nil {
 		return "", err
 	}
 	plainText := []byte(text)
-	cfb := cipher.NewCFBEncrypter(block, bytes)
+	cfb := cipher.NewCFBEncrypter(block, iv)
 	cipherText := make([]byte, len(plainText))
 	cfb.XORKeyStream(cipherText, plainText)
 	return self.Encode(cipherText), nil
@@ -56,7 +76,7 @@ if err != nil {
 		return "", err
 	}
 	cipherText := self.Decode(text)
-	cfb := cipher.NewCFBDecrypter(block, bytes)
+	cfb := cipher.NewCFBDecrypter(block, iv)
 	plainText := make([]byte, len(cipherText))
 	cfb.XORKeyStream(plainText, cipherText)
 	return string(plainText), nil
@@ -64,18 +84,24 @@ }
 
 func WithCrypto(next http.Handler, crypto SymmetricCrypto) http.Handler {
 	handlerFunc := func(w http.ResponseWriter, req *http.Request) {
-		//urlParams := req.Context().Value("params").(map[string]string)
-		//cipher := urlParams["cipher"]
-
+	 util.AddContextValue(req, "crypto", crypto);
 		next.ServeHTTP(w, req)
 	}
 
 	return http.HandlerFunc(handlerFunc)
 }
 
-func WithUserStore(next http.Handler, udb auth.UserStore) http.Handler {
+func WithUserStoreAndCrypto(next http.Handler, udb auth.UserStore, crypto SymmetricCrypto) http.Handler {
 	handlerFunc := func(w http.ResponseWriter, req *http.Request) {
-		*req = *req.WithContext(context.WithValue(req.Context(), "udb", udb))
+	   urlParams := req.Context().Value("params").(map[string]string)
+	   success := false
+		 cipher := urlParams["cipher"]
+		 username := req.FormValue("username")
+		 password := req.FormValue("password")
+		 if crypto.IsValid(cipher) && len(username) > 0 && len(password) > 0 {
+		  success = udb.AddUser(username, password) == nil
+		 }
+	  util.AddContextValue(req, "success", success);
 		next.ServeHTTP(w, req)
 	}
 
@@ -86,8 +112,8 @@ func CreateRegistrationInterface(udb auth.UserStore, secret string) http.Handler {
 	rtr := &router.Router{Fallback: *template.Must(template.ParseFiles("templates/error.html"))}
 	crypto := &SymmetricCrypt{Secret: secret}
 
-	rtr.Get(`/(?P<cipher>.*)`, WithCrypto(renderer.Template("templates/register.html"), crypto))
-	rtr.Post(`/(?P<cipher>.*)`, WithUserStore(WithCrypto(renderer.Template("templates/registered.html"), crypto), udb))
+	rtr.Get(`/(?P<cipher>\S+)`, WithCrypto(renderer.Template("templates/register.html"), crypto))
+	rtr.Post(`/(?P<cipher>\S+)`, WithUserStoreAndCrypto(renderer.Template("templates/registered.html"), udb, crypto))
 
 	return http.HandlerFunc(rtr.ServeHTTP)
 }

@@ -142,7 +142,7 @@ margin: 0.25em;
 }
 
 .ui_win a {
-  color: #1f9b92;
+  color: var(--main_color);
 }
 
 .ui_win a:hover, ui_win a:active {
@@ -197,4 +197,35 @@ 
 .two_btn_list li {
   display: grid;
   grid-template-columns: 1fr auto auto;
+}
+
+#registration {
+  background: var(--bg_color);
+  color: var(--fg_color);
+  width: 500px;
+  max-width: 80vw;
+  margin: 2em auto;
+  text-align: center;
+  padding: 1em;
+}
+
+#registration h1, #registration form {
+  margin: 1em auto;
+}
+
+#registration label, #registration button {
+  display: block;
+  margin: 1em;
+}
+
+#registration button {
+  margin: 0 auto;
+}
+
+#registration a {
+  color: var(--main_color);
+}
+
+#registration a:hover {
+  color: var(--fg_color);
 }

@@ -0,0 +1,25 @@ 
+{{ $cipher := ((.Context).Value "params").cipher }}
+{{ $valid := ((.Context).Value "crypto").IsValid $cipher }}
+
+<html lang="en-US">
+  <head>
+    <meta charset="UTF-8" />
+    <title>Felt &mdash; Admin Registration</title>
+    <meta name="viewport" content="width=device-width" />
+    <link href="/table/style.css" rel="stylesheet" />
+  </head>
+<body>
+<main id="registration">
+<h1>Felt Admin Registration</h1>
+{{ if $valid }}
+  <form action="/register/{{ $cipher }}" method="post">
+  <label>username <input id="username" name="username"/></label>
+  <label>password <input id="password" name="password" type="password"/></label>
+  <button type="submit">Register</button>
+  </form>
+{{ else }}
+  <p class="error">The registration token you provided is invalid</p>
+{{end}}
+</main>
+</body>
+</html>

@@ -0,0 +1,21 @@ 
+
+{{ $success := ((.Context).Value "success") }}
+<html lang="en-US">
+  <head>
+    <meta charset="UTF-8" />
+    <title>Felt &mdash; Registration Complete</title>
+    <meta name="viewport" content="width=device-width" />
+    <link href="/table/style.css" rel="stylesheet" />
+  </head>
+<body>
+<main id="registration">
+{{ if $success }}
+<h1>Registration Complete</h1>
+  <p>Success! <a href="/table">Let's game!</a></p>
+{{ else }}
+  <h1>Error</h1>
+  <p class="error">Something went wrong; please try a different username or obtain a new registration code.</p>
+{{end}}
+</main>
+</body>
+</html>