Add new certificateProvider extension API.

chrome/test/data/extensions/api_test/certificate_provider/basic.js

+// Copyright 2015 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.
+
+'use strict';
+
+var assertEq = chrome.test.assertEq;
+var assertTrue = chrome.test.assertTrue;
+var callbackPass = chrome.test.callbackPass;
+var succeed = chrome.test.succeed;
+
+var data = {
+  // X.509 certificate in DER encoding issued by 'root.pem' which is set to be
+  // trusted by the test setup.
+  // Generated by create_test_certs.sh .
+  l1_leaf_cert: 'l1_leaf.der',
+};
+
+// Reads the binary file at |path| and passes it as a Uint8Array to |callback|.
+function readFile(path, callback) {
+  var oReq = new XMLHttpRequest();
+  oReq.responseType = "arraybuffer";
+  oReq.open("GET", path, true /* asynchronous */);
+  oReq.onload = function() {
+    var arrayBuffer = oReq.response;
+    if (arrayBuffer) {
+      callback(new Uint8Array(arrayBuffer));
+    } else {
+      callback(null);
+    }
+  };
+  oReq.send(null);
+}
+
+// For each key in dictionary, replaces the path dictionary[key] by the content
+// of the resource located at that path stored in a Uint8Array.
+function readData(dictionary, callback) {

[bartfab (slow), 2015/09/04 09:21:57]

Nit: Do we really need all this if in the end, we just read a single file?

[pneubeck (no reviews), 2015/09/07 17:21:33]

If possible I'd like to share this with the same function in
api_test/platform_keys .
But let me remove it, as long as we only have a single cert.

+  var keys = Object.keys(dictionary);
+  function recurse(index) {
+    if (index >= keys.length) {

[bartfab (slow), 2015/09/04 09:21:57]

Nit: How is ">" possible?

[pneubeck (no reviews), 2015/09/07 17:21:33]

Done.

+      callback();
+      return;
+    }
+    var key = keys[index];
+    var path = dictionary[key];
+    readFile(path, function(array) {
+      assertTrue(!!array);
+      dictionary[key] = array;
+      recurse(index + 1);
+    });
+  }
+
+  recurse(0);

[bartfab (slow), 2015/09/04 09:21:57]

Whatever happened to good old for loops?

[pneubeck (no reviews), 2015/09/07 17:21:33]

If we had an asynchronous for loop, I'd be happy to use it.
The recursive call happens in the callback of readFile.

+}
+
+var signDigestRequest;
+var signCallback;
+
+function register() {
+  assertTrue(!!chrome.certificateProvider);
+  assertTrue(!!chrome.certificateProvider.onCertificatesRequested);
+  assertTrue(!!chrome.certificateProvider.onSignDigestRequested);
+
+  var validCertInfo = {
+    certificate: data.l1_leaf_cert.buffer,
+    supportedHashes: ['SHA1']
+  };
+  var invalidCert = new Uint8Array([1, 2, 3, 4, 5]);
+  var invalidCertInfo = {
+    certificate: invalidCert.buffer,
+    supportedHashes: ['SHA256']
+  };
+
+  function checkResult(rejectedCerts) {
+    assertEq(1, rejectedCerts.length);
+  }

[bartfab (slow), 2015/09/04 09:21:57]

Should this not verify which cert was rejected?

[pneubeck (no reviews), 2015/09/07 17:21:33]

Requires comparing arrays, which the standard javascript library doesn't
provide.
I instead compare the length now, here and in the sign request.

+
+  function reportCertificates(reportCallback) {
+    reportCallback([validCertInfo, invalidCertInfo], callbackPass(checkResult));
+  }
+
+  chrome.certificateProvider.onCertificatesRequested.addListener(
+      callbackPass(reportCertificates));
+
+  chrome.certificateProvider.onSignDigestRequested.addListener(function(
+      request, callback) {
+    signCallback = callback;
+    signDigestRequest = request;
+    succeed();
+  });
+
+  succeed();
+}
+
+function replyWithSignature(signature) {
+  signCallback(signature.buffer, function() {});
+}
+
+function replyWithSignatureSecondTime() {
+  var signature = new Uint8Array([1,2,3]);
+  try {
+    signCallback(signature.buffer, function() {});
+  } catch (e) {
+    return true;
+  }
+  return false;
+}
+
+function runTest() {
+  chrome.test.runTests([register]);
+}
+
+readData(data, runTest);