[NaCl SDK] Expose Google Drive to nacl_io.

native_client_sdk/src/examples/demo/nacl_io_demo/example.js

Index: native_client_sdk/src/examples/demo/nacl_io_demo/example.js
diff --git a/native_client_sdk/src/examples/demo/nacl_io_demo/example.js b/native_client_sdk/src/examples/demo/nacl_io_demo/example.js
index 7cb83c15b65a1563f16b4c0f8f2b5cca811224ed..16533d0004a7103faaf204ebc662ed05d2639a6c 100644
--- a/native_client_sdk/src/examples/demo/nacl_io_demo/example.js
+++ b/native_client_sdk/src/examples/demo/nacl_io_demo/example.js
@@ -2,6 +2,108 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+var CLIENT_ID = "TO FILL";
+var CLIENT_SECRET = "TO FILL";
+
+var REDIRECT_URI = "http://localhost:5103/index.html";
+
+var currentURL = window.location.href;
+var tokenValue = "Set at domContentLoaded()";
+
+function createScopeClause(scopeArray) {
+  var scopeClause = scopeArray[0];
+  for (var i = 1; i < scopeArray.length; ++i) {
+    scopeClause += "+" + scopeArray[i];
+  }
+  return scopeClause;
+}
+
+function addNextParameter(url, paramKey, paramValue) {
+  url += "&";
+  url += paramKey;
+  url += "=";
+  url += paramValue;
+  return url;
+}
+
+function addFirstQueryParameter(url, paramKey, paramValue) {
+  url += "?";
+  url += paramKey;
+  url += "=";
+  url += paramValue;
+  return url;
+}
+
+function addNextQueryParameter(url, paramKey, paramValue) {
+  return addNextParameter(url, paramKey, paramValue);
+}
+
+function addNextPostRequestParam(params, paramKey, paramValue) {
+  return addNextParameter(params, paramKey, paramValue);
+}
+
+function buttonOnClick() {
+  if (CLIENT_ID == "TO FILL" || CLIENT_SECRET == "TO FILL") {
+    alert('Error: CLIENT_ID or CLIENT_SECRET is not set.' + 
+          ' Please fill in CLIENT_ID and CLIENT_SECRET,' + 
+          ' created from Google Developers Console, in example.js.' + 
+          ' After that, use makefile on nacl_io_demo and rerun the' +
+          ' demo.');
+  }
+
+  var array = new Uint32Array(3);
+  window.crypto.getRandomValues(array);
+  var stateValue = array[0].toString() +
+    array[1].toString() +
+    array[2].toString();
+
+  var url = "http://accounts.google.com/o/oauth2/v2/auth";
+  var scopeArray = [ "https://www.googleapis.com/auth/drive",
+    "https://www.googleapis.com/auth/drive.metadata"
+  ];
+  url = addFirstQueryParameter(url, "scope", 
+                               createScopeClause(scopeArray));
+  url = addNextQueryParameter(url, "state", stateValue);
+  url = addNextQueryParameter(url, "redirect_uri", REDIRECT_URI);
+  url = addNextQueryParameter(url, "response_type", "code");
+  url = addNextQueryParameter(url, "client_id", CLIENT_ID);
+ 
+  window.open(url, "_self");
+}
+
+function executeAfterGettingCode() {
+  var codeKeyIndex = currentURL.indexOf("code=");
+  if (-1 == codeKeyIndex) {
+    return -1;
+  }
+
+  var xHTTP = new XMLHttpRequest();
+  xHTTP.onreadystatechange = function() {
+    // Check if the state is a state that the request finished 
+    // and response is ready and if the status code is OK.
+    if (xHTTP.readyState == 4 && xHTTP.status == 200) {
+      var obj = JSON.parse(xHTTP.responseText);
+      var url = REDIRECT_URI;
+      url = addFirstQueryParameter(url, "token", obj.access_token);
+
+      window.open(url, "_self");
+    }
+  };
+
+  xHTTP.timeout = 4000; // Set timeout to 4 seconds (4000 milliseconds)
+  xHTTP.ontimeout = function () { alert("Timed out"); }
+
+  var params = currentURL.substring(codeKeyIndex);
+  params = addNextPostRequestParam(params, "client_id", CLIENT_ID);
+  params = addNextPostRequestParam(params, "client_secret", CLIENT_SECRET);
+  params = addNextPostRequestParam(params, "redirect_uri", REDIRECT_URI);
+  params = addNextPostRequestParam(params, "grant_type", "authorization_code");
+
+  xHTTP.open("POST", "https://www.googleapis.com/oauth2/v4/token", true);
+  xHTTP.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
+  xHTTP.send(params);
+}
+
 function moduleDidLoad() {
   common.hideModule();
 }
@@ -17,7 +119,20 @@ function domContentLoaded(name, tc, config, width, height) {
         common.updateStatus(
             'Allocated ' + bytes + ' bytes of persistant storage.');
         common.attachDefaultListeners();
-        common.createNaClModule(name, tc, config, width, height);
+
+        var tokenKeyAndEqual = "token=";
+        var tokenKeyIndex = currentURL.indexOf(tokenKeyAndEqual);
+        if (-1 == tokenKeyIndex) {
+          common.createNaClModule(name, tc, config, width, height);
+        } else {
+          tokenValue = currentURL.substring(tokenKeyIndex + 
+              tokenKeyAndEqual.length);
+          var tokenMap = { 'token' : tokenValue };
+
+          common.createNaClModule(name, tc, config, width, height, tokenMap);
+
+          document.getElementById("buttonsignin").disabled = true;
+        }
       },
       function(e) { alert('Failed to allocate space') });
 }
@@ -343,7 +458,7 @@ function handleMessage(message_event) {
       callback.apply(null, params);
     }
   } else {
-    common.logMessage('Error: Unknow message `' + data +
+    common.logMessage('Error: Unknown message `' + data +
                       '` received from NaCl module.');
   }
 }