WebRtcBrowserTest prep-CL for IndexedDB cloning of RTCCertificate.

chrome/test/data/webrtc/indexeddb.js

+/**
+ * Copyright 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.
+ */
+
+/** @private */
+var kDatabaseName = 'WebRTC-Database';
+
+/**
+ * The one and only |IDBDatabase| in this page.
+ * @private
+ */
+var gDatabase = null;
+
+/**
+ * Set by |generateAndCloneCertificate|.
+ */
+var gCertificate = null;
+var gCertificateClone = null;
+
+// Public interface to tests. These are expected to be called with
+// ExecuteJavascript invocations from the browser tests and will return answers
+// through the DOM automation controller.
+
+function openDatabase() {
+  if (gDatabase !== null)
+    throw failTest('The database is already open.');
+  var reqOpen = indexedDB.open(kDatabaseName);
+  reqOpen.onupgradeneeded = function() {
+    // This happens before |onsuccess| if the database is new or its version is
+    // updated. Create object stores.
+    var db = reqOpen.result;
+    var certStore = db.createObjectStore('certificates', { keyPath: 'id' });
+  };
+  reqOpen.onsuccess = function() {
+    if (gDatabase !== null)
+      failTest('The database is already open.');
+    gDatabase = reqOpen.result;
+    returnToTest('ok-database-opened');
+  }
+  reqOpen.onerror = function() {
+    failTest('The database could not be opened. Error: ' + reqOpen.error);
+  }
+}
+
+function closeDatabase() {
+  if (gDatabase === null)
+    throw failTest('The database is already closed.');
+  gDatabase.close();
+  gDatabase = null;
+  returnToTest('ok-database-closed');
+}
+
+function deleteDatabase() {
+  if (gDatabase !== null)
+    throw failTest('The database should be closed before deleting.');
+  var reqDelete = indexedDB.deleteDatabase(kDatabaseName);
+  reqDelete.onsuccess = function () {
+    returnToTest('ok-database-deleted');
+  };
+  reqDelete.onerror = function () {
+    failTest('The database could not be deleted. Error: ' + reqDelete.error);
+  };
+}
+
+/**
+ * Generates a certificate and clones it by saving and loading it to the
+ * database (requires database to be open, see |openDatabase|). After returning
+ * successfully to the test, the global variables |gCertificate| and
+ * |gCertificateClone| have been set.
+ * @param {!Object} keygenAlgorithm An |AlgorithmIdentifier| to be used as
+ * parameter to |RTCPeerConnection.generateCertificate|. The resulting
+ * certificate will be used by the peer connection.
+ */
+function generateAndCloneCertificate(keygenAlgorithm) {
+  RTCPeerConnection.generateCertificate(keygenAlgorithm).then(
+      function(certificate) {
+        gCertificate = certificate;
+        cloneCertificate_(gCertificate).then(
+            function(clone) {
+              gCertificateClone = clone;
+              // TODO(hbos): Verify that |gCertificate| is value-equal to
+              // |gCertificateClone|. crbug.com/609108
+              returnToTest('ok-generated-and-cloned');
+            },
+            function() {
+              failTest('Error cloning certificate.');
+            });
+      },
+      function() {
+        failTest('Certificate generation failed. keygenAlgorithm: ' +
+            JSON.stringify(keygenAlgorithm));
+      });
+}
+
+// Internals.
+
+/** @private */
+function saveCertificate_(certificate) {
+  return new Promise(function(resolve, reject) {
+      if (gDatabase === null)

[phoglund_chromium, 2016/05/10 08:10:16]

Nit: indent 2?

[hbos_chromium, 2016/05/10 12:17:27]

Done.

+        throw failTest('The database is not open.');
+
+      var certTrans = gDatabase.transaction('certificates', 'readwrite');
+      var certStore = certTrans.objectStore('certificates');
+      var certPut = certStore.put({
+        id:0,
+        cert:certificate
+      });
+
+      certPut.onsuccess = function() {
+        resolve();
+      };
+      certPut.onerror = function() {
+        reject(certPut.error);
+      };
+  });
+}
+
+/** @private */
+function loadCertificate_() {
+  return new Promise(function(resolve, reject) {
+    if (gDatabase === null)
+      throw failTest('The database is not open.');
+
+    var certTrans = gDatabase.transaction('certificates', 'readonly');
+    var certStore = certTrans.objectStore('certificates');
+
+    var reqGet = certStore.get(0);
+    reqGet.onsuccess = function() {
+      var match = reqGet.result;
+      if (match !== undefined) {
+        resolve(match.cert);
+      } else {
+        resolve(null);
+      }
+    };
+    reqGet.onerror = function() {
+      reject(reqGet.error);
+    };
+  });
+}
+
+/** @private */
+function cloneCertificate_(certificate) {

[jsbell, 2016/05/09 18:35:33]

Since all of the functions this calls return promises, this can be simplified
to:

function cloneCertificate_(certificate) {
  return saveCertificate_(certificate)
    .then(loadCertificate_)
    .then(function(clone) {
      // Load successful.
      if (clone === null)
        failTest('...');
      return clone;
    });
}

[hbos_chromium, 2016/05/10 06:37:59]

Nice. I'll do that before landing.

+  return new Promise(function(resolve, reject) {
+    saveCertificate_(certificate).then(
+        function() {
+          // Certificate saved successfully, now load it.
+          loadCertificate_().then(
+              function(clone) {
+                // Load successful.
+                if (clone === null)
+                  failTest('loadCertificate returned a null certificate.');
+                resolve(clone);
+              },
+              reject);
+        },
+        reject);
+  });
+}