handle multi-coin payments correctly

extension/background/emscriptif.js

@@ -242,6 +242,12 @@ class PackedArenaObject extends ArenaObject {
         emsc.free(d);
         return s;
     }
+    toJson() {
+        // Per default, the json encoding of
+        // packed arena objects is just the crockford encoding.
+        // Subclasses typically want to override this.
+        return this.toCrock();
+    }
     loadCrock(s) {
         this.alloc();
         // We need to get the javascript string
@@ -286,6 +292,14 @@ class AmountNbo extends PackedArenaObject {
     size() {
         return 24;
     }
+    toJson() {
+        let a = new DefaultArena();
+        let am = new Amount(null, a);
+        am.fromNbo(this);
+        let json = am.toJson();
+        a.destroy();
+        return json;
+    }
 }
 class EddsaPrivateKey extends PackedArenaObject {
     static create(a) {
@@ -468,6 +482,19 @@ class SignatureStruct {
         let ba = new ByteArray(totalSize, buf, a);
         return new EccSignaturePurpose(this.purpose(), ba);
     }
+    toJson() {
+        let res = {};
+        for (let f of this.fieldTypes()) {
+            let name = f[0];
+            let member = this.members[name];
+            if (!member) {
+                throw Error(format("Member {0} not set", name));
+            }
+            res[name] = member.toJson();
+        }
+        res["purpose"] = this.purpose();
+        return res;
+    }
     set(name, value) {
         let typemap = {};
         for (let f of this.fieldTypes()) {

extension/background/emscriptif.ts

@@ -387,6 +387,13 @@ abstract class PackedArenaObject extends ArenaObject {
     return s;
   }
 
+  toJson(): any {
+    // Per default, the json encoding of
+    // packed arena objects is just the crockford encoding.
+    // Subclasses typically want to override this.
+    return this.toCrock();
+  }
+
   loadCrock(s: string) {
     this.alloc();
     // We need to get the javascript string
@@ -420,7 +427,6 @@ abstract class PackedArenaObject extends ArenaObject {
     return x;
   }
 
-
   hexdump() {
     let bytes: string[] = [];
     for (let i = 0; i < this.size(); i++) {
@@ -441,6 +447,14 @@ class AmountNbo extends PackedArenaObject {
   size() {
     return 24;
   }
+  toJson(): any {
+    let a = new DefaultArena();
+    let am = new Amount(null, a);
+    am.fromNbo(this);
+    let json = am.toJson();
+    a.destroy();
+    return json;
+  }
 }
 
 
@@ -673,6 +687,21 @@ abstract class SignatureStruct {
     return new EccSignaturePurpose(this.purpose(), ba);
   }
 
+
+  toJson()  {
+    let res: any = {};
+    for (let f of this.fieldTypes()) {
+      let name = f[0];
+      let member = this.members[name];
+      if (!member) {
+        throw Error(format("Member {0} not set", name));
+      }
+      res[name] = member.toJson();
+    }
+    res["purpose"] = this.purpose();
+    return res;
+  }
+
   protected set(name: string, value: PackedArenaObject) {
     let typemap: any = {};
     for (let f of this.fieldTypes()) {

extension/background/wallet.js

@@ -34,21 +34,24 @@ function signDeposit(db, offer, cds) {
         }
         amountSpent.add(coinSpend);
         amountRemaining.sub(coinSpend);
-        let d = new DepositRequestPS({
+        let newAmount = new Amount(cd.coin.currentAmount);
+        newAmount.sub(coinSpend);
+        cd.coin.currentAmount = newAmount.toJson();
+        let args = {
             h_contract: HashCode.fromCrock(offer.H_contract),
             h_wire: HashCode.fromCrock(offer.contract.H_wire),
-            amount_with_fee: new Amount(cd.coin.currentAmount).toNbo(),
+            amount_with_fee: coinSpend.toNbo(),
             coin_pub: EddsaPublicKey.fromCrock(cd.coin.coinPub),
             deposit_fee: new Amount(cd.denom.fee_deposit).toNbo(),
             merchant: EddsaPublicKey.fromCrock(offer.contract.merchant_pub),
             refund_deadline: AbsoluteTimeNbo.fromTalerString(offer.contract.refund_deadline),
             timestamp: AbsoluteTimeNbo.fromTalerString(offer.contract.timestamp),
             transaction_id: UInt64.fromNumber(offer.contract.transaction_id),
-        });
+        };
-        let newAmount = new Amount(cd.coin.currentAmount);
+        let d = new DepositRequestPS(args);
-        newAmount.sub(coinSpend);
+        console.log("Deposit request #" + ret.length);
-        cd.coin.currentAmount = newAmount.toJson();
+        console.log("DepositRequestPS: \n", d.toJson());
-        console.log("DepositRequestPS: ", d.toPurpose().hexdump());
+        console.log("DepositRequestPS sig: \n", d.toPurpose().hexdump());
         let coinSig = eddsaSign(d.toPurpose(), EddsaPrivateKey.fromCrock(cd.coin.coinPriv))
             .toCrock();
         let s = {
@@ -56,7 +59,7 @@ function signDeposit(db, offer, cds) {
             coin_pub: cd.coin.coinPub,
             ub_sig: cd.coin.denomSig,
             denom_pub: cd.coin.denomPub,
-            f: amountSpent.toJson(),
+            f: coinSpend.toJson(),
         };
         ret.push({ sig: s, updatedCoin: cd.coin });
     }
@@ -126,6 +129,7 @@ function getPossibleMintCoins(db, paymentAmount, depositFeeLimit, allowedMints)
                 let minAmount = new Amount(paymentAmount);
                 let accFee = new Amount(coins[0].c.denom.fee_deposit);
                 let accAmount = Amount.getZero(coins[0].c.coin.currentAmount.currency);
+                let usableCoins = [];
                 nextCoin: for (let i = 0; i < coins.length; i++) {
                     let coinAmount = new Amount(coins[i].c.coin.currentAmount);
                     let coinFee = coins[i].a;
@@ -138,8 +142,9 @@ function getPossibleMintCoins(db, paymentAmount, depositFeeLimit, allowedMints)
                         console.log("too much fees");
                         continue nextMint;
                     }
+                    usableCoins.push(coins[i].c);
                     if (accAmount.cmp(minAmount) >= 0) {
-                        ret[key] = m[key];
+                        ret[key] = usableCoins;
                         continue nextMint;
                     }
                 }

extension/background/wallet.ts

@@ -97,23 +97,27 @@ function signDeposit(db: IDBDatabase,
     amountSpent.add(coinSpend);
     amountRemaining.sub(coinSpend);
 
-    let d = new DepositRequestPS({
+    let newAmount = new Amount(cd.coin.currentAmount);
+    newAmount.sub(coinSpend);
+    cd.coin.currentAmount = newAmount.toJson();
+
+    let args: DepositRequestPS_Args = {
       h_contract: HashCode.fromCrock(offer.H_contract),
       h_wire: HashCode.fromCrock(offer.contract.H_wire),
-      amount_with_fee: new Amount(cd.coin.currentAmount).toNbo(),
+      amount_with_fee: coinSpend.toNbo(),
       coin_pub: EddsaPublicKey.fromCrock(cd.coin.coinPub),
       deposit_fee: new Amount(cd.denom.fee_deposit).toNbo(),
       merchant: EddsaPublicKey.fromCrock(offer.contract.merchant_pub),
       refund_deadline: AbsoluteTimeNbo.fromTalerString(offer.contract.refund_deadline),
       timestamp: AbsoluteTimeNbo.fromTalerString(offer.contract.timestamp),
       transaction_id: UInt64.fromNumber(offer.contract.transaction_id),
-    });
+    };
 
-    let newAmount = new Amount(cd.coin.currentAmount);
+    let d = new DepositRequestPS(args);
-    newAmount.sub(coinSpend);
-    cd.coin.currentAmount = newAmount.toJson();
 
-    console.log("DepositRequestPS: ", d.toPurpose().hexdump());
+    console.log("Deposit request #" + ret.length);
+    console.log("DepositRequestPS: \n", d.toJson());
+    console.log("DepositRequestPS sig: \n", d.toPurpose().hexdump());
 
     let coinSig = eddsaSign(d.toPurpose(),
                             EddsaPrivateKey.fromCrock(cd.coin.coinPriv))
@@ -124,7 +128,7 @@ function signDeposit(db: IDBDatabase,
       coin_pub: cd.coin.coinPub,
       ub_sig: cd.coin.denomSig,
       denom_pub: cd.coin.denomPub,
-      f: amountSpent.toJson(),
+      f: coinSpend.toJson(),
     };
     ret.push({sig: s, updatedCoin: cd.coin});
   }
@@ -206,6 +210,7 @@ function getPossibleMintCoins(db: IDBDatabase,
           let minAmount = new Amount(paymentAmount);
           let accFee = new Amount(coins[0].c.denom.fee_deposit);
           let accAmount = Amount.getZero(coins[0].c.coin.currentAmount.currency);
+          let usableCoins: Db.CoinWithDenom[] = [];
           nextCoin:
           for (let i = 0; i < coins.length; i++) {
             let coinAmount = new Amount(coins[i].c.coin.currentAmount);
@@ -219,8 +224,9 @@ function getPossibleMintCoins(db: IDBDatabase,
               console.log("too much fees");
               continue nextMint;
             }
+            usableCoins.push(coins[i].c);
             if (accAmount.cmp(minAmount) >= 0) {
-              ret[key] = m[key];
+              ret[key] = usableCoins;
               continue nextMint;
             }
           }