/*
 * Copyright (C) 2009, 2012 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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 "ThreadableWebSocketChannel.h"

#include "ContentRuleListResults.h"
#include "Document.h"
#include "Page.h"
#include "RuntimeEnabledFeatures.h"
#include "ScriptExecutionContext.h"
#include "SocketProvider.h"
#include "ThreadableWebSocketChannelClientWrapper.h"
#include "UserContentProvider.h"
#include "WebSocketChannel.h"
#include "WebSocketChannelClient.h"
#include "WorkerGlobalScope.h"
#include "WorkerRunLoop.h"
#include "WorkerThread.h"
#include "WorkerThreadableWebSocketChannel.h"

namespace WebCore {

Ref<ThreadableWebSocketChannel> ThreadableWebSocketChannel::create(ScriptExecutionContext& context, WebSocketChannelClient& client, SocketProvider& provider)
{
    if (is<WorkerGlobalScope>(context)) {
        WorkerGlobalScope& workerGlobalScope = downcast<WorkerGlobalScope>(context);
        WorkerRunLoop& runLoop = workerGlobalScope.thread().runLoop();
        return WorkerThreadableWebSocketChannel::create(workerGlobalScope, client, makeString("webSocketChannelMode", runLoop.createUniqueId()), provider);
    }

    auto& document = downcast<Document>(context);

    bool shouldProviderCreateSocketChannel = false;
#if HAVE(NSURLSESSION_WEBSOCKET)
    shouldProviderCreateSocketChannel = RuntimeEnabledFeatures::sharedFeatures().isNSURLSessionWebSocketEnabled();
#endif
#if USE(SOUP)
    shouldProviderCreateSocketChannel = getenv("WEBKIT_USE_SOUP_WEBSOCKETS");
#endif

    if (shouldProviderCreateSocketChannel) {
        if (auto channel = provider.createWebSocketChannel(document, client))
            return channel.releaseNonNull();
    }

    return WebSocketChannel::create(document, client, provider);
}

Optional<ThreadableWebSocketChannel::ValidatedURL> ThreadableWebSocketChannel::validateURL(Document& document, const URL& requestedURL)
{
    ValidatedURL validatedURL { requestedURL, true };
#if ENABLE(CONTENT_EXTENSIONS)
    if (auto* page = document.page()) {
        if (auto* documentLoader = document.loader()) {
            auto results = page->userContentProvider().processContentRuleListsForLoad(validatedURL.url, ContentExtensions::ResourceType::Raw, *documentLoader);
            if (results.summary.blockedLoad)
                return { };
            if (results.summary.madeHTTPS) {
                ASSERT(validatedURL.url.protocolIs("ws"));
                validatedURL.url.setProtocol("wss");
            }
            validatedURL.areCookiesAllowed = !results.summary.blockedCookies;
        }
    }
#else
    UNUSED_PARAM(document);
#endif
    return validatedURL;
}

Optional<ResourceRequest> ThreadableWebSocketChannel::webSocketConnectRequest(Document& document, const URL& url)
{
    auto validatedURL = validateURL(document, url);
    if (!validatedURL)
        return { };

    ResourceRequest request { validatedURL->url };
    request.setHTTPUserAgent(document.userAgent(validatedURL->url));
    request.setDomainForCachePartition(document.domainForCachePartition());
    request.setAllowCookies(validatedURL->areCookiesAllowed);

    // Add no-cache headers to avoid compatibility issue.
    // There are some proxies that rewrite "Connection: upgrade"
    // to "Connection: close" in the response if a request doesn't contain
    // these headers.
    request.addHTTPHeaderField(HTTPHeaderName::Pragma, "no-cache");
    request.addHTTPHeaderField(HTTPHeaderName::CacheControl, "no-cache");

    return request;
}

} // namespace WebCore
