[NaCl SDK] Expose Google Drive to nacl_io.

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

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Obtain a client ID and client secret from Google Developers Console
+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 buttonOnClick() {
+  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?" +
+    "scope=https://www.googleapis.com/auth/drive"
+       + "+" + "https://www.googleapis.com/auth/drive.metadata" + "&" + 
+    "state=" + stateValue + "&" +
+    "redirect_uri=http://localhost:5103/index.html" + "&" +
+    "response_type=code" + "&" +
+    "client_id=" + CLIENT_ID;
+
+  window.open(url, "_self");
+}
+
+function executeAfterGettingCode() {
+  var codeKeyIndex = currentURL.search("code=");
+  if (-1 == codeKeyIndex) {
+    return -1;
+  }
+  var codeValue = currentURL.substring(codeKeyIndex + 5);
+
+  var xHTTP = new XMLHttpRequest();
+  xHTTP.onreadystatechange = function() {
+    if (xHTTP.readyState == 4 && xHTTP.status == 200) {
+      var obj = JSON.parse(xHTTP.responseText);
+      var url = REDIRECT_URI + "?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 = "code=" + codeValue + "&" +
+    "client_id=" + CLIENT_ID + "&" +
+    "client_secret=" + CLIENT_SECRET + "&" +
+    "redirect_uri=" + REDIRECT_URI + "&" +
+    "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();
 }
 
 function $(id) {
   return document.getElementById(id);
 }
 
-// Called by the common.js module.
 function domContentLoaded(name, tc, config, width, height) {
-  navigator.webkitPersistentStorage.requestQuota(5 * 1024 * 1024,
-      function(bytes) {
-        common.updateStatus(
-            'Allocated ' + bytes + ' bytes of persistant storage.');
-        common.attachDefaultListeners();
-        common.createNaClModule(name, tc, config, width, height);
-      },
-      function(e) { alert('Failed to allocate space') });
+  common.attachDefaultListeners();
+  
+  var tokenKeyIndex = currentURL.search("token=");
+  if (-1 == tokenKeyIndex) {
+    common.createNaClModule(name, tc, config, width, height);
+  } else {
+    tokenValue = currentURL.substring(tokenKeyIndex + 6);
+    var tokenMap = { 'token' : tokenValue };
+
+    common.createNaClModule(name, tc, config, width, height, tokenMap);
+
+    document.getElementById("buttonid").disabled = true;
+  }
 }
 
-// Called by the common.js module.
 function attachListeners() {
   var radioEls = document.querySelectorAll('input[type="radio"]');
   for (var i = 0; i < radioEls.length; ++i) {
     radioEls[i].addEventListener('click', onRadioClicked);
   }
 
   // Wire up the 'click' event for each function's button.
   var functionEls = document.querySelectorAll('.function');
   for (var i = 0; i < functionEls.length; ++i) {
     var functionEl = functionEls[i];
     var id = functionEl.getAttribute('id');
     var buttonEl = functionEl.querySelector('button');
 
     // The function name matches the element id.
     var func = window[id];
     buttonEl.addEventListener('click', func);
   }
-
-  $('pipe_input_box').addEventListener('keypress', onPipeInput)
-  $('pipe_output').disabled = true;
-
-  $('pipe_name').addEventListener('change',
-                                  function() { $('pipe_output').value = ''; })
-}
-
-// Called with keypress events on the pipe input box
-function onPipeInput(e) {
-  // Create an arraybuffer containing the 16-bit char code
-  // from the keypress event.
-  var buffer = new ArrayBuffer(1*2);
-  var bufferView = new Uint16Array(buffer);
-  bufferView[0] = e.charCode;
-
-  // Pass the buffer in a dictionary over the NaCl module
-  var pipeSelect = $('pipe_name');
-  var pipeName = pipeSelect[pipeSelect.selectedIndex].value;
-  var message = {
-    pipe: pipeName,
-    operation: 'write',
-    payload: buffer,
-  };
-  nacl_module.postMessage(message);
-  e.preventDefault();
-  return false;
 }
 
 function onRadioClicked(e) {
   var divId = this.id.slice(5);  // skip "radio"
   var functionEls = document.querySelectorAll('.function');
   for (var i = 0; i < functionEls.length; ++i) {
     var visible = functionEls[i].id === divId;
     if (functionEls[i].id === divId)
       functionEls[i].removeAttribute('hidden');
     else
@@ skipping 146 matching lines @@
     common.logMessage('Changed directory to: ' + dirname + '.');
   });
 }
 
 function getcwd(e) {
   postCall('getcwd', function(dirname) {
     common.logMessage('getcwd: ' + dirname + '.');
   });
 }
 
-function getaddrinfo(e) {
-  var name = $('getaddrinfoName').value;
-  var family = $('getaddrinfoFamily').value;
-  postCall('getaddrinfo', name, family, function(name, addrType) {
-    common.logMessage('getaddrinfo returned successfully');
-    common.logMessage('ai_cannonname = ' + name + '.');
-    var count = 1;
-    for (var i = 1; i < arguments.length; i+=2) {
-      var msg = 'Address number ' + count + ' = ' + arguments[i] +
-                ' (' + arguments[i+1] + ')';
-      common.logMessage(msg);
-      count += 1;
-    }
-  });
-}
-
-function gethostbyname(e) {
-  var name = $('gethostbynameName').value;
-  postCall('gethostbyname', name, function(name, addrType) {
-    common.logMessage('gethostbyname returned successfully');
-    common.logMessage('h_name = ' + name + '.');
-    common.logMessage('h_addr_type = ' + addrType + '.');
-    for (var i = 2; i < arguments.length; i++) {
-      common.logMessage('Address number ' + (i-1) + ' = ' + arguments[i] + '.');
-    }
-  });
-}
-
-function connect(e) {
-  var host = $('connectHost').value;
-  var port = parseInt($('connectPort').value, 10);
-  postCall('connect', host, port, function(sockhandle) {
-    common.logMessage('connected');
-    addNameToSelectElements('.sock-handle', sockhandle, '[socket]');
-  });
-}
-
-function recv(e) {
-  var handle = parseInt($('recvHandle').value, 10);
-  var bufferSize = parseInt($('recvBufferSize').value, 10);
-  postCall('recv', handle, bufferSize, function(messageLen, message) {
-    common.logMessage("received " + messageLen + ' bytes: ' + message);
-  });
-}
-
-function send(e) {
-  var handle = parseInt($('sendHandle').value, 10);
-  var message = $('sendMessage').value;
-  postCall('send', handle, message, function(sentBytes) {
-    common.logMessage("sent bytes: " + sentBytes);
-  });
-}
-
-function close(e) {
-  var handle = parseInt($('closeHandle').value, 10);
-  postCall('close', handle, function(sock) {
-    removeNameFromSelectElements('.sock-handle', sock, "[socket]");
-    common.logMessage("closed socket: " + sock);
-  });
-}
-
 var funcToCallback = {};
 
 function postCall(func) {
   var callback = arguments[arguments.length - 1];
   funcToCallback[func] = callback;
 
   nacl_module.postMessage({
     cmd: func,
     args: Array.prototype.slice.call(arguments, 1, -1)
   });
 }
 
 function ArrayBufferToString(buf) {
   return String.fromCharCode.apply(null, new Uint16Array(buf));
 }
 
-// Called by the common.js module.
 function handleMessage(message_event) {
   var data = message_event.data;
   if ((typeof(data) === 'string' || data instanceof String)) {
     common.logMessage(data);
   } else if (data instanceof Object) {
-    var pipeName = data['pipe']
-    if (pipeName !== undefined) {
-      // Message for JavaScript I/O pipe
-      var operation = data['operation'];
-      if (operation == 'write') {
-        $('pipe_output').value += ArrayBufferToString(data['payload']);
-      } else if (operation == 'ack') {
-        common.logMessage(pipeName + ": ack:" + data['payload']);
-      } else {
-        common.logMessage('Got unexpected pipe operation: ' + operation);
-      }
-    } else {
-      // Result from a function call.
-      var params = data.args;
-      var funcName = data.cmd;
-      var callback = funcToCallback[funcName];
+    // Result from a function call.
+    var params = data.args;
+    var funcName = data.cmd;
+    var callback = funcToCallback[funcName];
 
-      if (!callback) {
-        common.logMessage('Error: Bad message ' + funcName +
-                          ' received from NaCl module.');
-        return;
-      }
+    if (!callback) {
+      common.logMessage('Error: Bad message ' + funcName +
+                        ' received from NaCl module.');
+      return;
+    }
 
-      delete funcToCallback[funcName];
-      callback.apply(null, params);
-    }
+    delete funcToCallback[funcName];
+    callback.apply(null, params);
   } else {
-    common.logMessage('Error: Unknow message `' + data +
+    common.logMessage('Error: Unknown message `' + data +
                       '` received from NaCl module.');
   }
 }