fix inadvertent double spending with coin selection

content_scripts/notify.js

@@ -35,34 +35,16 @@ var TalerNotify;
         return url;
     }
     var handlers = [];
-    var connected = false;
     // Hack to know when the extension is unloaded
-    var port;
-    var connect = function (dh) {
-        port = chrome.runtime.connect();
-        port.onDisconnect.addListener(dh);
-        chrome.runtime.sendMessage({ type: "ping" }, function () {
-            console.log("registering handlers");
-            connected = true;
-            registerHandlers();
-        });
-    };
-    var disconectHandler = function () {
-        if (connected) {
-            console.log("chrome runtime disconnected, removing handlers");
-            for (var _i = 0, handlers_1 = handlers; _i < handlers_1.length; _i++) {
-                var handler = handlers_1[_i];
-                document.removeEventListener(handler.type, handler.listener);
-            }
+    var port = chrome.runtime.connect();
+    port.onDisconnect.addListener(function () {
+        console.log("chrome runtime disconnected, removing handlers");
+        for (var _i = 0, handlers_1 = handlers; _i < handlers_1.length; _i++) {
+            var handler = handlers_1[_i];
+            document.removeEventListener(handler.type, handler.listener);
         }
-        else {
-            // We got disconnected before the extension was ready, reconnect ...
-            window.setTimeout(function () {
-                connect(disconectHandler);
-            }, 200);
-        }
-    };
-    connect(disconectHandler);
+    });
+    registerHandlers();
     function registerHandlers() {
         var $ = function (x) { return document.getElementById(x); };
         function addHandler(type, listener) {

content_scripts/notify.ts

@@ -45,36 +45,17 @@ namespace TalerNotify {
 
   const handlers = [];
 
-  let connected = false;
-
   // Hack to know when the extension is unloaded
-  let port;
+  let port = chrome.runtime.connect();
 
-  const connect = (dh) => {
-    port = chrome.runtime.connect();
-    port.onDisconnect.addListener(dh);
-    chrome.runtime.sendMessage({type: "ping"}, () => {
-      console.log("registering handlers");
-      connected = true;
-      registerHandlers();
-    });
-  };
-
-  var disconectHandler = () => {
-    if (connected) {
-      console.log("chrome runtime disconnected, removing handlers");
-      for (let handler of handlers) {
-        document.removeEventListener(handler.type, handler.listener);
-      }
-    } else {
-      // We got disconnected before the extension was ready, reconnect ...
-      window.setTimeout(() => {
-        connect(disconectHandler);
-      }, 200);
+  port.onDisconnect.addListener(() => {
+    console.log("chrome runtime disconnected, removing handlers");
+    for (let handler of handlers) {
+      document.removeEventListener(handler.type, handler.listener);
     }
-  };
+  });
 
-  connect(disconectHandler);
+  registerHandlers();
 
   function registerHandlers() {
     const $ = (x) => document.getElementById(x);

lib/wallet/query.ts

@@ -144,6 +144,7 @@ class QueryStreamIndexJoin<T> extends QueryStreamBase<T> {
         f(true, undefined, tx);
         return;
       }
+      console.log("joining on", this.key(value));
       let s = tx.objectStore(this.storeName).index(this.indexName);
       let req = s.openCursor(IDBKeyRange.only(this.key(value)));
       req.onsuccess = () => {
@@ -163,14 +164,14 @@ class QueryStreamIndexJoin<T> extends QueryStreamBase<T> {
 class IterQueryStream<T> extends QueryStreamBase<T> {
   private storeName;
   private options;
+  private subscribers;
 
   constructor(qr, storeName, options) {
     super(qr);
     this.options = options;
     this.storeName = storeName;
-  }
+    this.subscribers = [];
 
-  subscribe(f) {
     let doIt = (tx) => {
       const {indexName = void 0, only = void 0} = this.options;
       let s;
@@ -188,16 +189,24 @@ class IterQueryStream<T> extends QueryStreamBase<T> {
       req.onsuccess = (e) => {
         let cursor: IDBCursorWithValue = req.result;
         if (cursor) {
-          f(false, cursor.value, tx);
+          for (let f of this.subscribers) {
+            f(false, cursor.value, tx);
+          }
           cursor.continue();
         } else {
-          f(true, undefined, tx);
+          for (let f of this.subscribers) {
+            f(true, undefined, tx);
+          }
         }
       }
     };
 
     this.root.addWork(doIt, null, false);
   }
+
+  subscribe(f) {
+    this.subscribers.push(f);
+  }
 }
 
 

lib/wallet/wallet.ts

@@ -352,8 +352,9 @@ export class Wallet {
     // denomination
     let m: ExchangeCoins = {};
 
-    function storeExchangeCoin(mc) {
+    function storeExchangeCoin(mc, url) {
       let exchange: IExchangeInfo = mc[0];
+      console.log("got coin for exchange", url);
       let coin: Coin = mc[1];
       let cd = {
         coin: coin,
@@ -366,20 +367,28 @@ export class Wallet {
         console.warn("same pubkey for different currencies");
         return;
       }
-      let x = m[exchange.baseUrl];
+      let x = m[url];
       if (!x) {
-        m[exchange.baseUrl] = [cd];
+        m[url] = [cd];
       } else {
         x.push(cd);
       }
     }
 
-    let ps = allowedExchanges.map((info) => {
+    // Make sure that we don't look up coins
+    // for the same URL twice ...
+    let handledExchanges = new Set();
+
+    let ps = allowedExchanges.map((info: ExchangeHandle) => {
+      if (handledExchanges.has(info.url)) {
+        return;
+      }
+      handledExchanges.add(info.url);
       console.log("Checking for merchant's exchange", JSON.stringify(info));
       return Query(this.db)
         .iter("exchanges", {indexName: "pubKey", only: info.master_pub})
         .indexJoin("coins", "exchangeBaseUrl", (exchange) => exchange.baseUrl)
-        .reduce(storeExchangeCoin);
+        .reduce((x) => storeExchangeCoin(x, info.url));
     });
 
     return Promise.all(ps).then(() => {
@@ -398,6 +407,8 @@ export class Wallet {
       nextExchange:
         for (let key in m) {
           let coins = m[key];
+          console.log("trying coins");
+          console.log(coins);
           // Sort by ascending deposit fee
           coins.sort((o1, o2) => Amounts.cmp(o1.denom.fee_deposit,
                                              o2.denom.fee_deposit));