Auth still in progress

pairgoth-common/src/main/kotlin/org/jeudego/pairgoth/util/AESCryptograph.kt

@@ -52,6 +52,5 @@ class AESCryptograph : Cryptograph {
     companion object {
         private val CIPHER = "AES/ECB/PKCS5Padding"
         private val ALGORITHM = "AES"
-
     }
 }

pairgoth-common/src/main/kotlin/org/jeudego/pairgoth/util/Randomizer.kt

@@ -0,0 +1,6 @@
+package org.jeudego.pairgoth.util
+
+object Randomizer {
+    private val validChars = ('a'..'z') + ('A'..'Z') + ('0'..'9')
+    fun randomString(length: Int) = CharArray(length) { validChars.random() }.concatToString()
+}

pairgoth-common/src/main/kotlin/org/jeudego/pairgoth/web/Shared.kt

@@ -0,0 +1,18 @@
+package org.jeudego.pairgoth.web
+
+import org.jeudego.pairgoth.util.Randomizer
+import java.lang.RuntimeException
+
+
+// a randomly generated secret shared by the API and View webapps
+val sharedSecret: String by lazy {
+    BaseWebappManager.properties.getProperty("auth.shared_secret") ?: when (BaseWebappManager.properties.getProperty("mode")) {
+        "standalone" -> Randomizer.randomString(16)
+        else -> when (BaseWebappManager.properties.getProperty("auth")) {
+            "none" -> " ".repeat(16)
+            else -> throw RuntimeException("missing property auth.shared_secret")
+        }
+    }.also {
+        if (it.length != 16) throw RuntimeException("shared secret must be 16 ascii chars long")
+    }
+}