3 files changed, 103 insertions, 31 deletions

diff --git a/extension/background/checkable.ts b/extension/background/checkable.ts
index 63fbd3646..f7e99df92 100644
--- a/extension/background/checkable.ts
+++ b/extension/background/checkable.ts
@@ -27,41 +27,81 @@
 namespace Checkable {
   let chkSym = Symbol("checkable");
 
-  function checkNumber(target, prop) {
-    return true;
+  function checkNumber(target, prop): any {
+    if ((typeof target) !== "number") {
+      throw Error("number expected for " + prop.propertyKey);
+    }
+    return target;
   }
 
-  function checkString(target, prop) {
-    return true;
+  function checkString(target, prop): any {
+    if (typeof target !== "string") {
+      throw Error("string expected for " + prop.propertyKey);
+    }
+    return target;
   }
 
-  export function Class(target) {
-    target.checked = (v) => {
-      let props = target.prototype[chkSym].props;
-      console.log("hello, world");
-      let remainingPropNames = new Set(Object.getOwnPropertyNames(v));
-
-      for (let prop of props) {
-        remainingPropNames.delete(prop);
-        console.log("prop", prop);
+  function checkValue(target, prop): any {
+    let type = prop.type;
+    if (!type) {
+      throw Error("assertion failed");
+    }
+    let v = target;
+    if (!v || typeof v !== "object") {
+      throw Error("expected object for " + prop.propertyKey);
+    }
+    let props = type.prototype[chkSym].props;
+    let remainingPropNames = new Set(Object.getOwnPropertyNames(v));
+    let obj = new type();
+    for (let prop of props) {
+      if (!remainingPropNames.has(prop.propertyKey)) {
+        throw Error("Property missing: " + prop.propertyKey);
       }
-
-      if (remainingPropNames.size != 0) {
-        throw Error("superfluous properties " + JSON.stringify(remainingPropNames.values()));
+      if (!remainingPropNames.delete(prop.propertyKey)) {
+        throw Error("assertion failed");
       }
+      let propVal = v[prop.propertyKey];
+      obj[prop.propertyKey] = prop.checker(propVal, prop);
+    }
+
+    if (remainingPropNames.size != 0) {
+      throw Error("superfluous properties " + JSON.stringify(Array.from(
+                    remainingPropNames.values())));
+    }
+    return obj;
+  }
+
+  export function Class(target) {
+    target.checked = (v) => {
+      return checkValue(v, {
+        propertyKey: "(root)",
+        type: target,
+        checker: checkValue
+      });
     };
     return target;
   }
 
   export function Value(type) {
-    function deco(target) {
+    function deco(target: Object, propertyKey: string | symbol): void {
+      let chk = target[chkSym];
+      if (!chk) {
+        chk = {props: []};
+        target[chkSym] = chk;
+      }
+      chk.props.push({
+                       propertyKey: propertyKey,
+                       checker: checkValue,
+                       type: type
+                     });
     }
 
     return deco;
   }
 
   export function List(type) {
-    function deco(target) {
+    function deco(target: Object, propertyKey: string | symbol): void {
+      throw Error("not implemented");
     }
 
     return deco;
diff --git a/extension/background/wallet.js b/extension/background/wallet.js
index 120d177eb..0962961d6 100644
--- a/extension/background/wallet.js
+++ b/extension/background/wallet.js
@@ -28,8 +28,6 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
-class MyClass {
-}
 let AmountJson = class {
 };
 __decorate([
@@ -44,6 +42,26 @@ __decorate([
 AmountJson = __decorate([
     Checkable.Class
 ], AmountJson);
+let CoinPaySig = class {
+};
+__decorate([
+    Checkable.String
+], CoinPaySig.prototype, "coin_sig", void 0);
+__decorate([
+    Checkable.String
+], CoinPaySig.prototype, "coin_pub", void 0);
+__decorate([
+    Checkable.String
+], CoinPaySig.prototype, "ub_sig", void 0);
+__decorate([
+    Checkable.String
+], CoinPaySig.prototype, "denom_pub", void 0);
+__decorate([
+    Checkable.Value(AmountJson)
+], CoinPaySig.prototype, "f", void 0);
+CoinPaySig = __decorate([
+    Checkable.Class
+], CoinPaySig);
 /**
  * See http://api.taler.net/wallet.html#general
  */
diff --git a/extension/background/wallet.ts b/extension/background/wallet.ts
index bb4326ec5..d9187f14a 100644
--- a/extension/background/wallet.ts
+++ b/extension/background/wallet.ts
@@ -26,14 +26,6 @@
 /// <reference path="../decl/chrome/chrome.d.ts" />
 "use strict";
 
-
-class MyClass {
-  value: number;
-  fraction: number;
-  currency: string;
-}
-
-
 @Checkable.Class
 class AmountJson {
   @Checkable.Number
@@ -48,6 +40,27 @@ class AmountJson {
   static check: (v: any) => AmountJson;
 }
 
+
+@Checkable.Class
+class CoinPaySig {
+  @Checkable.String
+  coin_sig: string;
+
+  @Checkable.String
+  coin_pub: string;
+
+  @Checkable.String
+  ub_sig: string;
+
+  @Checkable.String
+  denom_pub: string;
+
+  @Checkable.Value(AmountJson)
+  f: AmountJson;
+
+  static check: (v: any) => CoinPaySig;
+}
+
 interface AmountJson_interface {
   value: number;
   fraction: number
@@ -93,7 +106,8 @@ interface Contract {
   transaction_id: number;
 }
 
-interface CoinPaySig {
+
+interface CoinPaySig_interface {
   coin_sig: string;
   coin_pub: string;
   ub_sig: string;
@@ -117,7 +131,7 @@ interface Reserve {
 }
 
 
-type PayCoinInfo = Array<{ updatedCoin: Db.Coin, sig: CoinPaySig }>;
+type PayCoinInfo = Array<{ updatedCoin: Db.Coin, sig: CoinPaySig_interface }>;
 
 
 /**
@@ -180,7 +194,7 @@ function signDeposit(db: IDBDatabase,
                             EddsaPrivateKey.fromCrock(cd.coin.coinPriv))
       .toCrock();
 
-    let s: CoinPaySig = {
+    let s: CoinPaySig_interface = {
       coin_sig: coinSig,
       coin_pub: cd.coin.coinPub,
       ub_sig: cd.coin.denomSig,