From ab241e5ca2cb95db3acf628bbac55d8c0e94c667 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Fri, 9 Sep 2016 14:07:54 +0200
Subject: [PATCH] Make JSless payments work.

---
 content_scripts/notify.ts | 35 +++++++++++++----------------------
 lib/wallet/wxMessaging.ts | 10 ++++++----
 2 files changed, 19 insertions(+), 26 deletions(-)

diff --git a/content_scripts/notify.ts b/content_scripts/notify.ts
index ad77a1e37..63754af16 100644
--- a/content_scripts/notify.ts
+++ b/content_scripts/notify.ts
@@ -46,7 +46,7 @@ namespace TalerNotify {
     }
 
     var contract_request = new XMLHttpRequest();
-    console.log("downloading contract from '" + url + "'")
+    console.log("downloading contract from '" + url + "'");
     contract_request.open("GET", url, true);
     contract_request.onload = function (e) {
       if (contract_request.readyState == 4) {
@@ -76,6 +76,9 @@ namespace TalerNotify {
 
   /**
    * Wallet-internal version of executeContract, used for 402 payments.
+   *
+   * Even though we're inside a content script, we send events to the dom
+   * to avoid code duplication.
    */
   function internalExecuteContract(contractHash: string, payUrl: string,
                            offerUrl: string) {
@@ -86,25 +89,13 @@ namespace TalerNotify {
      * synchronous error message (such as an alert) or leave the page.
      */
     function handleFailedPayment(status) {
-      let timeoutHandle = null;
-      function err() {
-        alert("Payment failed: Unexpected status code for $pay_url: " + status);
-      }
-      function onResp() {
-        if (timeoutHandle != null) {
-          clearTimeout(timeoutHandle);
-          timeoutHandle = null;
-        }
-        err();
-      }
-      function onTimeout() {
-        timeoutHandle = null;
-        err();
-      }
-      let eve = new CustomEvent('taler-payment-failed', {detail: {}});
-      document.dispatchEvent(eve);
-      document.addEventListener("taler-payment-failed-ok", onResp, false);
-      timeoutHandle = setTimeout(onTimeout, 200);
+      const msg = {
+        type: "payment-failed",
+        detail: {},
+      };
+      chrome.runtime.sendMessage(msg, (resp) => {
+        alert("payment failed");
+      });
     }
 
 
@@ -157,7 +148,7 @@ namespace TalerNotify {
     };
 
     document.addEventListener("taler-notify-payment", handleResponse, false);
-    let eve = new CustomEvent('taler-fetch-payment', {detail: detail});
+    let eve = new CustomEvent('taler-execute-contract', {detail: detail});
     document.dispatchEvent(eve);
   }
 
@@ -333,7 +324,7 @@ namespace TalerNotify {
         console.log("got resp");
         console.dir(resp);
         if (!resp.success) {
-          console.log("got event detial:");
+          console.log("got event detail:");
           console.dir(e.detail);
           if (e.detail.offering_url) {
             console.log("offering url", e.detail.offering_url);
diff --git a/lib/wallet/wxMessaging.ts b/lib/wallet/wxMessaging.ts
index 95dcb929a..3ab56af71 100644
--- a/lib/wallet/wxMessaging.ts
+++ b/lib/wallet/wxMessaging.ts
@@ -54,7 +54,9 @@ function makeHandlers(db: IDBDatabase,
       return exportDb(db);
     },
     ["ping"]: function(detail, sender) {
-      return Promise.resolve(paymentRequestCache[sender.tab.id]);
+      let info = paymentRequestCookies[sender.tab.id];
+      delete paymentRequestCookies[sender.tab.id];
+      return Promise.resolve(info);
     },
     ["reset"]: function(detail, sender) {
       if (db) {
@@ -240,7 +242,7 @@ class ChromeNotifier implements Notifier {
 /**
  * Mapping from tab ID to payment information (if any).
  */
-let paymentRequestCache = {};
+let paymentRequestCookies = {};
 
 function handleHttpPayment(headerList: chrome.webRequest.HttpHeader[],
                            url: string, tabId: number): any {
@@ -251,7 +253,7 @@ function handleHttpPayment(headerList: chrome.webRequest.HttpHeader[],
 
   const contractUrl = headers["x-taler-contract-url"];
   if (contractUrl !== undefined) {
-    paymentRequestCache[tabId] = {type: "fetch", contractUrl};
+    paymentRequestCookies[tabId] = {type: "fetch", contractUrl};
     return;
   }
 
@@ -266,7 +268,7 @@ function handleHttpPayment(headerList: chrome.webRequest.HttpHeader[],
 
     // Offer URL is optional
     const offerUrl = headers["x-taler-offer-url"];
-    paymentRequestCache[tabId] = {
+    paymentRequestCookies[tabId] = {
       type: "execute",
       offerUrl,
       payUrl,