Initial support for cloudprint in print preview

chrome/browser/resources/print_preview_cloud.js

+// Copyright (c) 2011 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.
+
+cr.define('cloudprint', function() {
+
+  var cloudPrintBaseURL = '';
+
+  function setBaseURL(cloudPrintURL) {
+    cloudPrintBaseURL = cloudPrintURL;
+  }
+
+  function sendCloudPrintRequest(method,
+                                 action,
+                                 headers,
+                                 body,
+                                 callback,
+                                 async) {
+    var xhr = new XMLHttpRequest();
+    if (callback != null) {
+      xhr.onreadystatechange = function() {
+        if (xhr.readyState == 4) {
+          callback.call(this, xhr);
+        }
+      };
+    }
+    var url = cloudPrintBaseURL + '/' + action
+    xhr.open(method, url, async);
+    xhr.setRequestHeader("Content-Type",
+                         "application/x-www-form-urlencoded;charset=UTF-8");
+    if (headers) {
+      for (var header in headers) {
+        if (headers.hasOwnProperty(header)) {
+          xhr.setRequestHeader(header, headers[header]);
+        }
+      }
+    }
+    xhr.send(body);
+    return xhr;
+  }
+
+  function fetchPrinters(callback) {
+    try {
+      var xhr = sendCloudPrintRequest('POST',
+                                    'search',
+                                    {'Content-Type':
+                                     'application/x-www-form-urlencoded',
+                                     'X-CloudPrint-Proxy':
+                                     'ChromePrintPreview'},
+                                    '',
+                                    null,
+                                    false);
+      var searchResult = JSON.parse(xhr.responseText);
+      if (searchResult['success']) {
+        var printerList = searchResult['printers'];
+        callback.call(this, printerList);
+      }
+    } catch (err) {
+      callback.call(this, null);
+    }
+  }
+
+  function printToCloudResponse(callback, xhr) {
+    if (xhr.status == 200) {

[sanjeevr, 2011/05/24 23:21:25]

Don't we need to update some error status if it fails?

[Albert Bodenhamer, 2011/06/09 17:33:11]

Some sort of feedback would definitely be good.  I don't want to gate this on
proper handling of that though.  For now I'm just adding a TODO.

+      var printResult = JSON.parse(xhr.responseText);
+      if (printResult['success']) {
+        callback.call();
+      }
+    }
+  }
+
+  function printToCloud(data, callback) {
+    sendCloudPrintRequest('POST',
+                          'submit',
+                          {'X-CloudPrint-Proxy': 'ChromePrintPreview'},
+                          data,
+                          printToCloudResponse.bind(this, callback),
+                          true);
+  }
+
+  return {
+    fetchPrinters: fetchPrinters,
+    printToCloud: printToCloud,
+    setBaseURL: setBaseURL
+  };
+});