Move token stuff to single .js

public/auth.js

@@ -0,0 +1,62 @@
+class NewAuthToken {
+    constructor(key) {
+        if (!key) {
+            throw "invalid key"
+        }
+        this.key = key.repeat(32).substr(0, 32)
+    }
+
+    decode(b64, callback) {
+        var ciphertext = this.base64_decode(b64)
+
+        var iv = ciphertext.substr(0, 12)
+        var encrypted = ciphertext.substr(iv.length, ciphertext.length-iv.length)
+
+        this.get_crypto_key()
+            .then(function(crypto_key) {
+                NewAuthToken.decrypt(crypto_key, iv, encrypted, callback)
+            })
+    }
+
+    base64_decode(b64) {
+        return atob(b64)
+    }
+
+    static to_buffer(s) {
+        var bytes = new Uint8Array(s.length)
+        for (var i = 0; i < s.length; i++) {
+           bytes[i] = s.charCodeAt(i)
+        }
+        return bytes.buffer
+    }
+
+    static decrypt(crypto_key, iv, encrypted, callback) {
+        window.crypto.subtle.decrypt(
+           {name: "AES-GCM", iv: NewAuthToken.to_buffer(iv)},
+           crypto_key,
+           NewAuthToken.to_buffer(encrypted),
+        )
+            .then(function(decrypted) {
+                callback(String.fromCharCode.apply(null, new Uint8Array(decrypted)))
+            })
+    }
+
+    get_crypto_key() {
+        return crypto.subtle.importKey(
+            "raw",
+            NewAuthToken.to_buffer(this.key),
+            "AES-GCM",
+            false,
+            ["decrypt"]
+        )
+    }
+
+    set_token(encoded_token) {
+        this.decode(encoded_token, function (token) {
+            console.log("Set-Cookie DnDex-Auth="+token)
+            document.cookie = "DnDex-Auth=" + token + ";path=/"
+        })
+    }
+}
+
+authtoken = new NewAuthToken("123").set_token("SOY05yF/9iv3YG71sKkQPVaEwO53PCX8qZhDHS9JUohBgVl5Qr9/GTKK/TJ6OozhHN7QBIGmHNzQxTRRSLs4Lw==")