Add a callback to SecureSocket for certificates that fail to be authenticated.

tests/standalone/io/secure_socket_bad_certificate_test.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+//
+// VMOptions=
+// VMOptions=--short_socket_read
+// The --short_socket_write option does not work with external server
+// www.google.dk.  Add this to the test when we have secure server sockets.
+// See TODO below.
+
+#import("dart:isolate");
+#import("dart:io");
+
+void WriteAndClose(Socket socket, String message) {
+  var data = message.charCodes;
+  int written = 0;
+  void write() {
+    written += socket.writeList(data, written, data.length - written);
+    if (written < data.length) {
+      socket.onWrite = write;
+    } else {
+      socket.close(true);
+    }
+  }
+  write();
+}
+
+void main() {
+  SecureSocket.initialize(useBuiltinRoots: false);
+  testCertificateCallback(host: "www.google.dk",
+                          acceptCertificate: false).then((_) {
+    testCertificateCallback(host: "www.google.dk",
+                            acceptCertificate: true).then((_) {
+      // TODO(7153): Open a receive port, and close it when we get here.
+      // Currently, it can happen that neither onClosed or onError is called.
+      // So we never reach this point. Diagnose this and fix.
+    });
+  });
+}
+
+Future testCertificateCallback({String host, bool acceptCertificate}) {
+  Completer completer = new Completer();
+  var secure = new SecureSocket(host, 443);
+  List<String> chunks = <String>[];
+  secure.onConnect = () {
+    Expect.isTrue(acceptCertificate);
+    WriteAndClose(secure, "GET / HTTP/1.0\r\nHost: $host\r\n\r\n");
+  };
+  secure.onBadCertificate = (_) { };
+  secure.onBadCertificate = null;
+  Expect.throws(() => secure.onBadCertificate = 7,
+                (e) => e is TypeError || e is SocketIOException);
+  secure.onBadCertificate = (X509Certificate certificate) {
+    Expect.isTrue(certificate.subject.contains("O=Google Inc"));
+    Expect.isTrue(certificate.startValidity < new Date.now());
+    Expect.isTrue(certificate.endValidity > new Date.now());
+    return acceptCertificate;
+  };
+  secure.onData = () {
+    Expect.isTrue(acceptCertificate);
+    chunks.add(new String.fromCharCodes(secure.read()));
+  };
+  secure.onClosed = () {
+    Expect.isTrue(acceptCertificate);
+    String fullPage = Strings.concatAll(chunks);
+    Expect.isTrue(fullPage.contains('</body></html>'));
+    completer.complete(null);
+  };
+  secure.onError = (e) {
+    Expect.isFalse(acceptCertificate);
+    completer.complete(null);
+  };
+  return completer.future;
+}