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diff --git a/Source/WebKit2/WebProcess/Authentication/AuthenticationManager.cpp b/Source/WebKit2/WebProcess/Authentication/AuthenticationManager.cpp
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+++ b/Source/WebKit2/WebProcess/Authentication/AuthenticationManager.cpp
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+/*
+ * Copyright (C) 2010 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "AuthenticationManager.h"
+
+#include "Download.h"
+#include "DownloadProxyMessages.h"
+#include "MessageID.h"
+#include "WebCoreArgumentCoders.h"
+#include "WebFrame.h"
+#include "WebPage.h"
+#include "WebPageProxyMessages.h"
+#include "WebProcess.h"
+#include <WebCore/AuthenticationChallenge.h>
+#include <WebCore/AuthenticationClient.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+static uint64_t generateAuthenticationChallengeID()
+{
+    static uint64_t uniqueAuthenticationChallengeID = 1;
+    return uniqueAuthenticationChallengeID++;
+}
+
+AuthenticationManager& AuthenticationManager::shared()
+{
+    static AuthenticationManager& manager = *new AuthenticationManager;
+    return manager;
+}
+
+AuthenticationManager::AuthenticationManager()
+{
+}
+
+void AuthenticationManager::didReceiveMessage(CoreIPC::Connection* connection, CoreIPC::MessageID messageID, CoreIPC::ArgumentDecoder* arguments)
+{
+    didReceiveAuthenticationManagerMessage(connection, messageID, arguments);
+}
+
+void AuthenticationManager::didReceiveAuthenticationChallenge(WebFrame* frame, const AuthenticationChallenge& authenticationChallenge)
+{
+    ASSERT(frame);
+    ASSERT(frame->page());
+
+    uint64_t challengeID = generateAuthenticationChallengeID();
+    m_challenges.set(challengeID, authenticationChallenge);    
+    
+    WebProcess::shared().connection()->send(Messages::WebPageProxy::DidReceiveAuthenticationChallenge(frame->frameID(), authenticationChallenge, challengeID), frame->page()->pageID());
+}
+
+void AuthenticationManager::didReceiveAuthenticationChallenge(Download* download, const AuthenticationChallenge& authenticationChallenge)
+{
+    uint64_t challengeID = generateAuthenticationChallengeID();
+    m_challenges.set(challengeID, authenticationChallenge);
+
+    download->send(Messages::DownloadProxy::DidReceiveAuthenticationChallenge(authenticationChallenge, challengeID));
+}
+
+// Currently, only Mac knows how to respond to authentication challenges with certificate info.
+#if !PLATFORM(MAC)
+bool AuthenticationManager::tryUsePlatformCertificateInfoForChallenge(const WebCore::AuthenticationChallenge&, const PlatformCertificateInfo&)
+{
+    return false;
+}
+#endif
+
+void AuthenticationManager::useCredentialForChallenge(uint64_t challengeID, const Credential& credential, const PlatformCertificateInfo& certificateInfo)
+{
+    AuthenticationChallenge challenge = m_challenges.take(challengeID);
+    ASSERT(!challenge.isNull());
+    
+    if (tryUsePlatformCertificateInfoForChallenge(challenge, certificateInfo))
+        return;
+    
+    AuthenticationClient* coreClient = challenge.authenticationClient();
+    if (!coreClient) {
+        // This authentication challenge comes from a download.
+        Download::receivedCredential(challenge, credential);
+        return;
+        
+    }
+
+    coreClient->receivedCredential(challenge, credential);
+}
+
+void AuthenticationManager::continueWithoutCredentialForChallenge(uint64_t challengeID)
+{
+    AuthenticationChallenge challenge = m_challenges.take(challengeID);
+    ASSERT(!challenge.isNull());
+    AuthenticationClient* coreClient = challenge.authenticationClient();
+    if (!coreClient) {
+        // This authentication challenge comes from a download.
+        Download::receivedRequestToContinueWithoutCredential(challenge);
+        return;
+    }
+
+    coreClient->receivedRequestToContinueWithoutCredential(challenge);
+}
+
+void AuthenticationManager::cancelChallenge(uint64_t challengeID)
+{
+    AuthenticationChallenge challenge = m_challenges.take(challengeID);
+    ASSERT(!challenge.isNull());
+    AuthenticationClient* coreClient = challenge.authenticationClient();
+    if (!coreClient) {
+        // This authentication challenge comes from a download.
+        Download::receivedCancellation(challenge);
+        return;
+    }
+
+    coreClient->receivedCancellation(challenge);
+}
+
+} // namespace WebKit