Integration tests for WebStateDelegate::OnAuthRequired callback.

ios/web/public/test/response_providers/http_auth_response_provider.mm

Index: ios/web/public/test/response_providers/http_auth_response_provider.mm
diff --git a/ios/web/public/test/response_providers/http_auth_response_provider.mm b/ios/web/public/test/response_providers/http_auth_response_provider.mm
new file mode 100644
index 0000000000000000000000000000000000000000..36ed46c7cf3f85703d8924aee6e7608f14afc03b
--- /dev/null
+++ b/ios/web/public/test/response_providers/http_auth_response_provider.mm
@@ -0,0 +1,53 @@
+// Copyright 2017 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.
+
+#import "ios/web/public/test/response_providers/http_auth_response_provider.h"
+
+#include "base/base64.h"
+#include "base/strings/stringprintf.h"
+#include "net/http/http_request_headers.h"
+#include "net/http/http_response_headers.h"
+
+namespace web {
+
+HttpAuthResponseProvider::HttpAuthResponseProvider(const GURL& url,
+                                                   const std::string& realm,
+                                                   const std::string& username,
+                                                   const std::string& password)
+    : url_(url), realm_(realm), username_(username), password_(password) {}
+
+HttpAuthResponseProvider::~HttpAuthResponseProvider() = default;
+
+bool HttpAuthResponseProvider::CanHandleRequest(const Request& request) {
+  return request.url == url_;
+}
+
+void HttpAuthResponseProvider::GetResponseHeadersAndBody(
+    const Request& request,
+    scoped_refptr<net::HttpResponseHeaders>* headers,
+    std::string* response_body) {
+  if (HeadersHaveValidCredentials(request.headers)) {
+    *response_body = page_text();
+    *headers = GetDefaultResponseHeaders();
+  } else {
+    *headers = GetResponseHeaders("", net::HTTP_UNAUTHORIZED);
+    (*headers)->AddHeader(base::StringPrintf(
+        "WWW-Authenticate: Basic realm=\"%s\"", realm_.c_str()));
+  }
+}
+
+bool HttpAuthResponseProvider::HeadersHaveValidCredentials(
+    const net::HttpRequestHeaders& headers) {
+  std::string header;
+  if (headers.GetHeader(net::HttpRequestHeaders::kAuthorization, &header)) {
+    std::string auth =
+        base::StringPrintf("%s:%s", username_.c_str(), password_.c_str());
+    std::string encoded_auth;
+    base::Base64Encode(auth, &encoded_auth);
+    return header == base::StringPrintf("Basic %s", encoded_auth.c_str());
+  }
+  return false;
+}
+
+}  // namespace web