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nsOfflineCacheUpdate.cpp

/* -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Corporation
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Dave Camp <dcamp@mozilla.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsOfflineCacheUpdate.h"

#include "nsCPrefetchService.h"
#include "nsCURILoader.h"
#include "nsICache.h"
#include "nsICacheService.h"
#include "nsICacheSession.h"
#include "nsICachingChannel.h"
#include "nsIDOMWindow.h"
#include "nsIDOMOfflineResourceList.h"
#include "nsIObserverService.h"
#include "nsIOfflineCacheSession.h"
#include "nsIWebProgress.h"
#include "nsICryptoHash.h"
#include "nsICacheEntryDescriptor.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsServiceManagerUtils.h"
#include "nsStreamUtils.h"
#include "nsThreadUtils.h"
#include "prlog.h"

static nsOfflineCacheUpdateService *gOfflineCacheUpdateService = nsnull;

#if defined(PR_LOGGING)
//
// To enable logging (see prlog.h for full details):
//
//    set NSPR_LOG_MODULES=nsOfflineCacheUpdate:5
//    set NSPR_LOG_FILE=offlineupdate.log
//
// this enables PR_LOG_ALWAYS level information and places all output in
// the file offlineupdate.log
//
static PRLogModuleInfo *gOfflineCacheUpdateLog;
#endif
#define LOG(args) PR_LOG(gOfflineCacheUpdateLog, 4, args)
#define LOG_ENABLED() PR_LOG_TEST(gOfflineCacheUpdateLog, 4)

class AutoFreeArray {
public:
    AutoFreeArray(PRUint32 count, char **values)
        : mCount(count), mValues(values) {};
    ~AutoFreeArray() { NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(mCount, mValues); }
private:
    PRUint32 mCount;
    char **mValues;
};

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateItem::nsISupports
//-----------------------------------------------------------------------------

NS_IMPL_ISUPPORTS6(nsOfflineCacheUpdateItem,
                   nsIDOMLoadStatus,
                   nsIRequestObserver,
                   nsIStreamListener,
                   nsIRunnable,
                   nsIInterfaceRequestor,
                   nsIChannelEventSink)

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateItem <public>
//-----------------------------------------------------------------------------

nsOfflineCacheUpdateItem::nsOfflineCacheUpdateItem(nsOfflineCacheUpdate *aUpdate,
                                                   nsIURI *aURI,
                                                   nsIURI *aReferrerURI,
                                                   const nsACString &aClientID)
    : mURI(aURI)
    , mReferrerURI(aReferrerURI)
    , mClientID(aClientID)
    , mUpdate(aUpdate)
    , mChannel(nsnull)
    , mState(nsIDOMLoadStatus::UNINITIALIZED)
    , mBytesRead(0)
{
}

nsOfflineCacheUpdateItem::~nsOfflineCacheUpdateItem()
{
}

nsresult
nsOfflineCacheUpdateItem::OpenChannel()
{
    nsresult rv = NS_NewChannel(getter_AddRefs(mChannel),
                                mURI,
                                nsnull, nsnull, this,
                                nsIRequest::LOAD_BACKGROUND |
                                nsICachingChannel::LOAD_ONLY_IF_MODIFIED |
                                nsICachingChannel::LOAD_CHECK_OFFLINE_CACHE);
    NS_ENSURE_SUCCESS(rv, rv);

    // configure HTTP specific stuff
    nsCOMPtr<nsIHttpChannel> httpChannel =
        do_QueryInterface(mChannel);
    if (httpChannel) {
        httpChannel->SetReferrer(mReferrerURI);
        httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("X-Moz"),
                                      NS_LITERAL_CSTRING("offline-resource"),
                                      PR_FALSE);
    }

    nsCOMPtr<nsICachingChannel> cachingChannel =
        do_QueryInterface(mChannel);
    if (cachingChannel) {
        rv = cachingChannel->SetCacheForOfflineUse(PR_TRUE);
        NS_ENSURE_SUCCESS(rv, rv);

        if (!mClientID.IsEmpty()) {
            rv = cachingChannel->SetOfflineCacheClientID(mClientID);
            NS_ENSURE_SUCCESS(rv, rv);
        }
    }

    rv = mChannel->AsyncOpen(this, nsnull);
    NS_ENSURE_SUCCESS(rv, rv);

    mState = nsIDOMLoadStatus::REQUESTED;

    return NS_OK;
}

nsresult
nsOfflineCacheUpdateItem::Cancel()
{
    if (mChannel) {
        mChannel->Cancel(NS_ERROR_ABORT);
        mChannel = nsnull;
    }

    mState = nsIDOMLoadStatus::UNINITIALIZED;

    return NS_OK;
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateItem::nsIStreamListener
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsOfflineCacheUpdateItem::OnStartRequest(nsIRequest *aRequest,
                                         nsISupports *aContext)
{
    mState = nsIDOMLoadStatus::RECEIVING;

    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateItem::OnDataAvailable(nsIRequest *aRequest,
                                          nsISupports *aContext,
                                          nsIInputStream *aStream,
                                          PRUint32 aOffset,
                                          PRUint32 aCount)
{
    PRUint32 bytesRead = 0;
    aStream->ReadSegments(NS_DiscardSegment, nsnull, aCount, &bytesRead);
    mBytesRead += bytesRead;
    LOG(("loaded %u bytes into offline cache [offset=%u]\n",
         bytesRead, aOffset));
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateItem::OnStopRequest(nsIRequest *aRequest,
                                        nsISupports *aContext,
                                        nsresult aStatus)
{
    LOG(("done fetching offline item [status=%x]\n", aStatus));

    mState = nsIDOMLoadStatus::LOADED;

    if (mBytesRead == 0 && aStatus == NS_OK) {
        // we didn't need to read (because LOAD_ONLY_IF_MODIFIED was
        // specified), but the object should report loadedSize as if it
        // did.
        mChannel->GetContentLength(&mBytesRead);
    }

    // We need to notify the update that the load is complete, but we
    // want to give the channel a chance to close the cache entries.
    NS_DispatchToCurrentThread(this);

    return NS_OK;
}


//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateItem::nsIRunnable
//-----------------------------------------------------------------------------
NS_IMETHODIMP
nsOfflineCacheUpdateItem::Run()
{
    mUpdate->LoadCompleted();

    return NS_OK;
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateItem::nsIInterfaceRequestor
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsOfflineCacheUpdateItem::GetInterface(const nsIID &aIID, void **aResult)
{
    if (aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
        NS_ADDREF_THIS();
        *aResult = static_cast<nsIChannelEventSink *>(this);
        return NS_OK;
    }

    return NS_ERROR_NO_INTERFACE;
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateItem::nsIChannelEventSink
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsOfflineCacheUpdateItem::OnChannelRedirect(nsIChannel *aOldChannel,
                                            nsIChannel *aNewChannel,
                                            PRUint32 aFlags)
{
    nsCOMPtr<nsIURI> newURI;
    nsresult rv = aNewChannel->GetURI(getter_AddRefs(newURI));
    if (NS_FAILED(rv))
        return rv;

    nsCOMPtr<nsICachingChannel> oldCachingChannel =
        do_QueryInterface(aOldChannel);
    nsCOMPtr<nsICachingChannel> newCachingChannel =
      do_QueryInterface(aOldChannel);
    if (newCachingChannel) {
        rv = newCachingChannel->SetCacheForOfflineUse(PR_TRUE);
        NS_ENSURE_SUCCESS(rv, rv);
        if (!mClientID.IsEmpty()) {
            rv = newCachingChannel->SetOfflineCacheClientID(mClientID);
            NS_ENSURE_SUCCESS(rv, rv);
        }
    }

    nsCAutoString oldScheme;
    mURI->GetScheme(oldScheme);

    PRBool match;
    if (NS_FAILED(newURI->SchemeIs(oldScheme.get(), &match)) || !match) {
        LOG(("rejected: redirected to a different scheme\n"));
        return NS_ERROR_ABORT;
    }

    // HTTP request headers are not automatically forwarded to the new channel.
    nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aNewChannel);
    NS_ENSURE_STATE(httpChannel);

    httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("X-Moz"),
                                  NS_LITERAL_CSTRING("offline-resource"),
                                  PR_FALSE);

    mChannel = aNewChannel;

    return NS_OK;
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateItem::nsIDOMLoadStatus
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsOfflineCacheUpdateItem::GetSource(nsIDOMNode **aSource)
{
    *aSource = nsnull;
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateItem::GetUri(nsAString &aURI)
{
    nsCAutoString spec;
    nsresult rv = mURI->GetSpec(spec);
    NS_ENSURE_SUCCESS(rv, rv);

    CopyUTF8toUTF16(spec, aURI);
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateItem::GetTotalSize(PRInt32 *aTotalSize)
{
    if (mChannel) {
        return mChannel->GetContentLength(aTotalSize);
    }

    *aTotalSize = -1;
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateItem::GetLoadedSize(PRInt32 *aLoadedSize)
{
    *aLoadedSize = mBytesRead;
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateItem::GetReadyState(PRUint16 *aReadyState)
{
    *aReadyState = mState;
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateItem::GetStatus(PRUint16 *aStatus)
{
    if (!mChannel) {
        *aStatus = 0;
        return NS_OK;
    }

    nsresult rv;
    nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(mChannel, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    PRUint32 httpStatus;
    rv = httpChannel->GetResponseStatus(&httpStatus);
    if (rv == NS_ERROR_NOT_AVAILABLE) {
        // Someone's calling this before we got a response... Check our
        // ReadyState.  If we're at RECEIVING or LOADED, then this means the
        // connection errored before we got any data; return a somewhat
        // sensible error code in that case.
        if (mState >= nsIDOMLoadStatus::RECEIVING) {
            *aStatus = NS_ERROR_NOT_AVAILABLE;
            return NS_OK;
        }

        *aStatus = 0;
        return NS_OK;
    }

    NS_ENSURE_SUCCESS(rv, rv);
    *aStatus = PRUint16(httpStatus);
    return NS_OK;
}

//-----------------------------------------------------------------------------
// nsOfflineManifestItem
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// nsOfflineManifestItem <public>
//-----------------------------------------------------------------------------

nsOfflineManifestItem::nsOfflineManifestItem(nsOfflineCacheUpdate *aUpdate,
                                             nsIURI *aURI,
                                             nsIURI *aReferrerURI,
                                             const nsACString &aClientID)
    : nsOfflineCacheUpdateItem(aUpdate, aURI, aReferrerURI, aClientID)
    , mParserState(PARSE_INIT)
    , mNeedsUpdate(PR_TRUE)
    , mManifestHashInitialized(PR_FALSE)
{
}

nsOfflineManifestItem::~nsOfflineManifestItem()
{
}

//-----------------------------------------------------------------------------
// nsOfflineManifestItem <private>
//-----------------------------------------------------------------------------

/* static */
NS_METHOD
nsOfflineManifestItem::ReadManifest(nsIInputStream *aInputStream,
                                    void *aClosure,
                                    const char *aFromSegment,
                                    PRUint32 aOffset,
                                    PRUint32 aCount,
                                    PRUint32 *aBytesConsumed)
{
    nsOfflineManifestItem *manifest =
        static_cast<nsOfflineManifestItem*>(aClosure);

    nsresult rv;

    *aBytesConsumed = aCount;

    if (manifest->mParserState == PARSE_ERROR) {
        // parse already failed, ignore this
        return NS_OK;
    }

    if (!manifest->mManifestHashInitialized) {
        // Avoid re-creation of crypto hash when it fails from some reason the first time
        manifest->mManifestHashInitialized = PR_TRUE;

        manifest->mManifestHash = do_CreateInstance("@mozilla.org/security/hash;1", &rv);
        if (NS_SUCCEEDED(rv)) {
            rv = manifest->mManifestHash->Init(nsICryptoHash::MD5);
            if (NS_FAILED(rv)) {
                manifest->mManifestHash = nsnull;
                LOG(("Could not initialize manifest hash for byte-to-byte check, rv=%08x", rv));
            }
        }
    }

    if (manifest->mManifestHash) {
        rv = manifest->mManifestHash->Update(reinterpret_cast<const PRUint8 *>(aFromSegment), aCount);
        if (NS_FAILED(rv)) {
            manifest->mManifestHash = nsnull;
            LOG(("Could not update manifest hash, rv=%08x", rv));
        }
    }

    manifest->mReadBuf.Append(aFromSegment, aCount);

    nsCString::const_iterator begin, iter, end;
    manifest->mReadBuf.BeginReading(begin);
    manifest->mReadBuf.EndReading(end);

    for (iter = begin; iter != end; iter++) {
        if (*iter == '\r' || *iter == '\n') {
            nsresult rv = manifest->HandleManifestLine(begin, iter);
            
            if (NS_FAILED(rv)) {
                LOG(("HandleManifestLine failed with 0x%08x", rv));
                return NS_ERROR_ABORT;
            }

            begin = iter;
            begin++;
        }
    }

    // any leftovers are saved for next time
    manifest->mReadBuf = Substring(begin, end);

    return NS_OK;
}

nsresult
nsOfflineManifestItem::HandleManifestLine(const nsCString::const_iterator &aBegin,
                                          const nsCString::const_iterator &aEnd)
{
    nsCString::const_iterator begin = aBegin;
    nsCString::const_iterator end = aEnd;

    // all lines ignore trailing spaces and tabs
    nsCString::const_iterator last = end;
    --last;
    while (end != begin && (*last == ' ' || *last == '\t')) {
        --end;
        --last;
    }

    if (mParserState == PARSE_INIT) {
        // Allow a UTF-8 BOM
        if (begin != end && static_cast<unsigned char>(*begin) == 0xef) {
            if (++begin == end || static_cast<unsigned char>(*begin) != 0xbb ||
                ++begin == end || static_cast<unsigned char>(*begin) != 0xbf) {
                mParserState = PARSE_ERROR;
                return NS_OK;
            }
            ++begin;
        }

        const nsCSubstring &magic = Substring(begin, end);

        if (!magic.EqualsLiteral("CACHE MANIFEST")) {
            mParserState = PARSE_ERROR;
            return NS_OK;
        }

        mParserState = PARSE_CACHE_ENTRIES;
        return NS_OK;
    }

    // lines other than the first ignore leading spaces and tabs
    while (begin != end && (*begin == ' ' || *begin == '\t'))
        begin++;

    // ignore blank lines and comments
    if (begin == end || *begin == '#')
        return NS_OK;

    const nsCSubstring &line = Substring(begin, end);

    if (line.EqualsLiteral("CACHE:")) {
        mParserState = PARSE_CACHE_ENTRIES;
        return NS_OK;
    }

    if (line.EqualsLiteral("FALLBACK:")) {
        mParserState = PARSE_FALLBACK_ENTRIES;
        return NS_OK;
    }

    if (line.EqualsLiteral("NETWORK:")) {
        mParserState = PARSE_NETWORK_ENTRIES;
        return NS_OK;
    }

    nsresult rv;

    switch(mParserState) {
    case PARSE_INIT:
    case PARSE_ERROR: {
        // this should have been dealt with earlier
        return NS_ERROR_FAILURE;
    }
    case PARSE_CACHE_ENTRIES: {
        nsCOMPtr<nsIURI> uri;
        rv = NS_NewURI(getter_AddRefs(uri), line, nsnull, mURI);
        if (NS_FAILED(rv))
            break;

        nsCAutoString scheme;
        uri->GetScheme(scheme);

        // Manifest URIs must have the same scheme as the manifest.
        PRBool match;
        if (NS_FAILED(mURI->SchemeIs(scheme.get(), &match)) || !match)
            break;

        mExplicitURIs.AppendObject(uri);
        break;
    }
    case PARSE_FALLBACK_ENTRIES:
    case PARSE_NETWORK_ENTRIES: {
        // we don't currently implement fallbacks or whitelists,
        // ignore these for now.
        break;
    }
    }

    return NS_OK;
}

nsresult 
nsOfflineManifestItem::GetOldManifestContentHash(nsIRequest *aRequest)
{
    nsresult rv;

    nsCOMPtr<nsICachingChannel> cachingChannel = do_QueryInterface(aRequest, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    // load the main cache token that is actually the old offline cache token and 
    // read previous manifest content hash value
    nsCOMPtr<nsISupports> cacheToken;
    cachingChannel->GetCacheToken(getter_AddRefs(cacheToken));
    if (cacheToken) {
        nsCOMPtr<nsICacheEntryDescriptor> cacheDescriptor(do_QueryInterface(cacheToken, &rv));
        NS_ENSURE_SUCCESS(rv, rv);
    
        rv = cacheDescriptor->GetMetaDataElement("offline-manifest-hash", getter_Copies(mOldManifestHashValue));
        if (NS_FAILED(rv))
            mOldManifestHashValue.Truncate();
    }

    return NS_OK;
}

nsresult 
nsOfflineManifestItem::CheckNewManifestContentHash(nsIRequest *aRequest)
{
    nsresult rv;

    if (!mManifestHash) {
        // Nothing to compare against...
        return NS_OK;
    }

    nsCString newManifestHashValue;
    rv = mManifestHash->Finish(PR_TRUE, newManifestHashValue);
    mManifestHash = nsnull;

    if (NS_FAILED(rv)) {
        LOG(("Could not finish manifest hash, rv=%08x", rv));
        // This is not critical error
        return NS_OK;
    }

    if (!ParseSucceeded()) {
        // Parsing failed, the hash is not valid
        return NS_OK;
    }

    if (mOldManifestHashValue == newManifestHashValue) {
        LOG(("Update not needed, downloaded manifest content is byte-for-byte identical"));
        mNeedsUpdate = PR_FALSE;
    }

    // Store the manifest content hash value to the new
    // offline cache token
    nsCOMPtr<nsICachingChannel> cachingChannel = do_QueryInterface(aRequest, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsISupports> cacheToken;
    cachingChannel->GetOfflineCacheToken(getter_AddRefs(cacheToken));
    if (cacheToken) {
        nsCOMPtr<nsICacheEntryDescriptor> cacheDescriptor(do_QueryInterface(cacheToken, &rv));
        NS_ENSURE_SUCCESS(rv, rv);
    
        rv = cacheDescriptor->SetMetaDataElement("offline-manifest-hash", PromiseFlatCString(newManifestHashValue).get());
        NS_ENSURE_SUCCESS(rv, rv);
    }

    return NS_OK;
}

NS_IMETHODIMP
nsOfflineManifestItem::OnStartRequest(nsIRequest *aRequest,
                                      nsISupports *aContext)
{
    nsresult rv;

    nsCOMPtr<nsIHttpChannel> channel = do_QueryInterface(aRequest, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    PRBool succeeded;
    rv = channel->GetRequestSucceeded(&succeeded);
    NS_ENSURE_SUCCESS(rv, rv);

    if (!succeeded) {
        LOG(("HTTP request failed"));
        mParserState = PARSE_ERROR;
        return NS_ERROR_ABORT;
    }

    nsCAutoString contentType;
    rv = channel->GetContentType(contentType);
    NS_ENSURE_SUCCESS(rv, rv);

    if (!contentType.EqualsLiteral("text/cache-manifest")) {
        LOG(("Rejected cache manifest with Content-Type %s (expecting text/cache-manifest)",
             contentType.get()));
        mParserState = PARSE_ERROR;
        return NS_ERROR_ABORT;
    }

    rv = GetOldManifestContentHash(aRequest);
    NS_ENSURE_SUCCESS(rv, rv);

    return nsOfflineCacheUpdateItem::OnStartRequest(aRequest, aContext);
}

NS_IMETHODIMP
nsOfflineManifestItem::OnDataAvailable(nsIRequest *aRequest,
                                       nsISupports *aContext,
                                       nsIInputStream *aStream,
                                       PRUint32 aOffset,
                                       PRUint32 aCount)
{
    PRUint32 bytesRead = 0;
    aStream->ReadSegments(ReadManifest, this, aCount, &bytesRead);
    mBytesRead += bytesRead;

    if (mParserState == PARSE_ERROR) {
        LOG(("OnDataAvailable is canceling the request due a parse error\n"));
        return NS_ERROR_ABORT;
    }

    LOG(("loaded %u bytes into offline cache [offset=%u]\n",
         bytesRead, aOffset));

    // All the parent method does is read and discard, don't bother
    // chaining up.

    return NS_OK;
}

NS_IMETHODIMP
nsOfflineManifestItem::OnStopRequest(nsIRequest *aRequest,
                                     nsISupports *aContext,
                                     nsresult aStatus)
{
    // handle any leftover manifest data
    nsCString::const_iterator begin, end;
    mReadBuf.BeginReading(begin);
    mReadBuf.EndReading(end);
    nsresult rv = HandleManifestLine(begin, end);
    NS_ENSURE_SUCCESS(rv, rv);

    if (mBytesRead == 0) {
        // we didn't need to read (because LOAD_ONLY_IF_MODIFIED was
        // specified.)
        mNeedsUpdate = PR_FALSE;
    } else {
        rv = CheckNewManifestContentHash(aRequest);
        NS_ENSURE_SUCCESS(rv, rv);
    }

    return nsOfflineCacheUpdateItem::OnStopRequest(aRequest, aContext, aStatus);
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdate::nsISupports
//-----------------------------------------------------------------------------

NS_IMPL_ISUPPORTS1(nsOfflineCacheUpdate,
                   nsIOfflineCacheUpdate)

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdate <public>
//-----------------------------------------------------------------------------

nsOfflineCacheUpdate::nsOfflineCacheUpdate()
    : mState(STATE_UNINITIALIZED)
    , mAddedItems(PR_FALSE)
    , mPartialUpdate(PR_FALSE)
    , mSucceeded(PR_TRUE)
    , mCurrentItem(-1)
{
}

nsOfflineCacheUpdate::~nsOfflineCacheUpdate()
{
    LOG(("nsOfflineCacheUpdate::~nsOfflineCacheUpdate [%p]", this));
}

nsresult
nsOfflineCacheUpdate::Init(PRBool aPartialUpdate,
                           nsIURI *aManifestURI,
                           nsIURI *aDocumentURI)
{
    nsresult rv;

    // Make sure the service has been initialized
    nsOfflineCacheUpdateService* service =
        nsOfflineCacheUpdateService::EnsureService();
    if (!service)
        return NS_ERROR_FAILURE;

    LOG(("nsOfflineCacheUpdate::Init [%p]", this));

    mPartialUpdate = aPartialUpdate;

    // Only http and https applications are supported.
    PRBool match;
    rv = aManifestURI->SchemeIs("http", &match);
    NS_ENSURE_SUCCESS(rv, rv);

    if (!match) {
        rv = aManifestURI->SchemeIs("https", &match);
        NS_ENSURE_SUCCESS(rv, rv);
        if (!match)
            return NS_ERROR_ABORT;
    }

    mManifestURI = aManifestURI;

    rv = mManifestURI->GetAsciiHost(mUpdateDomain);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCAutoString manifestSpec;

    rv = mManifestURI->GetAsciiSpec(manifestSpec);
    NS_ENSURE_SUCCESS(rv, rv);

    PRInt32 ref = manifestSpec.FindChar('#');
    if (ref != kNotFound)
        manifestSpec.Truncate(ref);

    mManifestOwnerSpec = manifestSpec;
    mManifestOwnerSpec.AppendLiteral("#manifest");

    mDynamicOwnerSpec = manifestSpec;
    mDynamicOwnerSpec.AppendLiteral("#dynamic");

    mDocumentURI = aDocumentURI;

    nsCOMPtr<nsICacheService> cacheService =
        do_GetService(NS_CACHESERVICE_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsICacheSession> session;
    rv = cacheService->CreateSession("HTTP-offline",
                                     nsICache::STORE_OFFLINE,
                                     nsICache::STREAM_BASED,
                                     getter_AddRefs(session));
    NS_ENSURE_SUCCESS(rv, rv);

    mMainCacheSession = do_QueryInterface(session, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    // Partial updates don't use temporary cache sessions
    if (aPartialUpdate) {
        mCacheSession = mMainCacheSession;
    } else {
        rv = cacheService->CreateTemporaryClientID(nsICache::STORE_OFFLINE,
                                                   mClientID);
        NS_ENSURE_SUCCESS(rv, rv);

        rv = cacheService->CreateSession(mClientID.get(),
                                         nsICache::STORE_OFFLINE,
                                         nsICache::STREAM_BASED,
                                         getter_AddRefs(session));
        NS_ENSURE_SUCCESS(rv, rv);

        mCacheSession = do_QueryInterface(session, &rv);
        NS_ENSURE_SUCCESS(rv, rv);

        // The manifest implicitly owns itself.
        rv = mCacheSession->AddOwnedKey(mUpdateDomain, mManifestOwnerSpec,
                                        manifestSpec);
        NS_ENSURE_SUCCESS(rv, rv);
    }

    mState = STATE_INITIALIZED;

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::HandleManifest(PRBool *aDoUpdate)
{
    // Be pessimistic
    *aDoUpdate = PR_FALSE;

    PRUint16 status;
    nsresult rv = mManifestItem->GetStatus(&status);
    NS_ENSURE_SUCCESS(rv, rv);

    if (status == 0 || status >= 400 || !mManifestItem->ParseSucceeded()) {
        return NS_ERROR_FAILURE;
    }

    if (!mManifestItem->NeedsUpdate()) {
        return NS_OK;
    }

    // Add items requested by the manifest.
    const nsCOMArray<nsIURI> &manifestURIs = mManifestItem->GetExplicitURIs();
    for (PRInt32 i = 0; i < manifestURIs.Count(); i++) {
        rv = AddURI(manifestURIs[i], mManifestOwnerSpec);
        NS_ENSURE_SUCCESS(rv, rv);
    }

    // The document that requested the manifest is implicitly included
    // as part of that manifest update.
    rv = AddURI(mDocumentURI, mManifestOwnerSpec);
    NS_ENSURE_SUCCESS(rv, rv);

    // Add items requested by the script API
    rv = AddOwnedItems(mDynamicOwnerSpec);
    NS_ENSURE_SUCCESS(rv, rv);

    *aDoUpdate = PR_TRUE;

    return NS_OK;
}

void
nsOfflineCacheUpdate::LoadCompleted()
{
    nsresult rv;

    LOG(("nsOfflineCacheUpdate::LoadCompleted [%p]", this));

    if (mState == STATE_CANCELLED) {
        Finish();
        return;
    }

    if (mState == STATE_CHECKING) {
        // Manifest load finished.

        NS_ASSERTION(mManifestItem,
                     "Must have a manifest item in STATE_CHECKING.");

        PRBool doUpdate;
        if (NS_FAILED(HandleManifest(&doUpdate))) {
            mSucceeded = PR_FALSE;
            NotifyError();
            Finish();
            return;
        }

        if (!doUpdate) {
            mSucceeded = PR_FALSE;
            NotifyNoUpdate();
            Finish();
            return;
        }

        mState = STATE_DOWNLOADING;
        NotifyDownloading();

        // Start fetching resources.
        ProcessNextURI();

        return;
    }

    // Normal load finished.

    nsRefPtr<nsOfflineCacheUpdateItem> item = mItems[mCurrentItem];
    mCurrentItem++;

    PRUint16 status;
    rv = item->GetStatus(&status);

    // Check for failures.  4XX and 5XX errors will cause the update to fail.
    if (NS_FAILED(rv) || status == 0 || status >= 400) {
        mSucceeded = PR_FALSE;
        NotifyError();
        Finish();
        return;
    }

    rv = NotifyCompleted(item);
    if (NS_FAILED(rv)) return;

    ProcessNextURI();
}

nsresult
nsOfflineCacheUpdate::Begin()
{
    LOG(("nsOfflineCacheUpdate::Begin [%p]", this));

    mCurrentItem = 0;

    if (mPartialUpdate) {
        mState = STATE_DOWNLOADING;
        NotifyDownloading();
        ProcessNextURI();
        return NS_OK;
    }

    // Start checking the manifest.
    nsCOMPtr<nsIURI> uri;

    mManifestItem = new nsOfflineManifestItem(this, mManifestURI,
                                              mDocumentURI, mClientID);
    if (!mManifestItem) {
        return NS_ERROR_OUT_OF_MEMORY;
    }

    mState = STATE_CHECKING;
    NotifyChecking();

    nsresult rv = mManifestItem->OpenChannel();
    if (NS_FAILED(rv)) {
        LoadCompleted();
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::Cancel()
{
    LOG(("nsOfflineCacheUpdate::Cancel [%p]", this));

    mState = STATE_CANCELLED;
    mSucceeded = PR_FALSE;

    if (mCurrentItem >= 0 &&
        mCurrentItem < static_cast<PRInt32>(mItems.Length())) {
        // Load might be running
        mItems[mCurrentItem]->Cancel();
    }

    return NS_OK;
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdate <private>
//-----------------------------------------------------------------------------

nsresult
nsOfflineCacheUpdate::AddOwnedItems(const nsACString &aOwnerURI)
{
    PRUint32 count;
    char **keys;
    nsresult rv = mMainCacheSession->GetOwnedKeys(mUpdateDomain, aOwnerURI,
                                                  &count, &keys);
    NS_ENSURE_SUCCESS(rv, rv);

    AutoFreeArray autoFree(count, keys);

    for (PRUint32 i = 0; i < count; i++) {
        nsCOMPtr<nsIURI> uri;
        if (NS_SUCCEEDED(NS_NewURI(getter_AddRefs(uri), keys[i]))) {
            nsRefPtr<nsOfflineCacheUpdateItem> item =
                new nsOfflineCacheUpdateItem(this, uri, mDocumentURI,
                                             mClientID);
            if (!item) return NS_ERROR_OUT_OF_MEMORY;

            mItems.AppendElement(item);
        }
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::ProcessNextURI()
{
    LOG(("nsOfflineCacheUpdate::ProcessNextURI [%p, current=%d, numItems=%d]",
         this, mCurrentItem, mItems.Length()));

    NS_ASSERTION(mState == STATE_DOWNLOADING,
                 "ProcessNextURI should only be called from the DOWNLOADING state");

    if (mCurrentItem >= static_cast<PRInt32>(mItems.Length())) {
        return Finish();
    }

#if defined(PR_LOGGING)
    if (LOG_ENABLED()) {
        nsCAutoString spec;
        mItems[mCurrentItem]->mURI->GetSpec(spec);
        LOG(("%p: Opening channel for %s", this, spec.get()));
    }
#endif

    NotifyStarted(mItems[mCurrentItem]);

    nsresult rv = mItems[mCurrentItem]->OpenChannel();
    if (NS_FAILED(rv)) {
        LoadCompleted();
        return rv;
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::GatherObservers(nsCOMArray<nsIOfflineCacheUpdateObserver> &aObservers)
{
    for (PRInt32 i = 0; i < mWeakObservers.Count(); i++) {
        nsCOMPtr<nsIOfflineCacheUpdateObserver> observer =
            do_QueryReferent(mWeakObservers[i]);
        if (observer)
            aObservers.AppendObject(observer);
        else
            mWeakObservers.RemoveObjectAt(i--);
    }

    for (PRInt32 i = 0; i < mObservers.Count(); i++) {
        aObservers.AppendObject(mObservers[i]);
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::NotifyError()
{
    LOG(("nsOfflineCacheUpdate::NotifyError [%p]", this));

    nsCOMArray<nsIOfflineCacheUpdateObserver> observers;
    nsresult rv = GatherObservers(observers);
    NS_ENSURE_SUCCESS(rv, rv);

    for (PRInt32 i = 0; i < observers.Count(); i++) {
        observers[i]->Error(this);
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::NotifyChecking()
{
    LOG(("nsOfflineCacheUpdate::NotifyChecking [%p]", this));

    nsCOMArray<nsIOfflineCacheUpdateObserver> observers;
    nsresult rv = GatherObservers(observers);
    NS_ENSURE_SUCCESS(rv, rv);

    for (PRInt32 i = 0; i < observers.Count(); i++) {
        observers[i]->Checking(this);
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::NotifyNoUpdate()
{
    LOG(("nsOfflineCacheUpdate::NotifyNoUpdate [%p]", this));

    nsCOMArray<nsIOfflineCacheUpdateObserver> observers;
    nsresult rv = GatherObservers(observers);
    NS_ENSURE_SUCCESS(rv, rv);

    for (PRInt32 i = 0; i < observers.Count(); i++) {
        observers[i]->NoUpdate(this);
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::NotifyDownloading()
{
    LOG(("nsOfflineCacheUpdate::NotifyDownloading [%p]", this));

    nsCOMArray<nsIOfflineCacheUpdateObserver> observers;
    nsresult rv = GatherObservers(observers);
    NS_ENSURE_SUCCESS(rv, rv);

    for (PRInt32 i = 0; i < observers.Count(); i++) {
        observers[i]->Downloading(this);
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::NotifyStarted(nsOfflineCacheUpdateItem *aItem)
{
    LOG(("nsOfflineCacheUpdate::NotifyStarted [%p, %p]", this, aItem));

    nsCOMArray<nsIOfflineCacheUpdateObserver> observers;
    nsresult rv = GatherObservers(observers);
    NS_ENSURE_SUCCESS(rv, rv);

    for (PRInt32 i = 0; i < observers.Count(); i++) {
        observers[i]->ItemStarted(this, aItem);
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::NotifyCompleted(nsOfflineCacheUpdateItem *aItem)
{
    LOG(("nsOfflineCacheUpdate::NotifyCompleted [%p, %p]", this, aItem));

    nsCOMArray<nsIOfflineCacheUpdateObserver> observers;
    nsresult rv = GatherObservers(observers);
    NS_ENSURE_SUCCESS(rv, rv);

    for (PRInt32 i = 0; i < observers.Count(); i++) {
        observers[i]->ItemCompleted(this, aItem);
    }

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::Finish()
{
    LOG(("nsOfflineCacheUpdate::Finish [%p]", this));

    mState = STATE_FINISHED;

    nsOfflineCacheUpdateService* service =
        nsOfflineCacheUpdateService::EnsureService();

    if (!service)
        return NS_ERROR_FAILURE;

    if (!mPartialUpdate) {
        if (mSucceeded) {
            nsresult rv = mMainCacheSession->MergeTemporaryClientID(mClientID);
            if (NS_FAILED(rv)) {
                NotifyError();
                mSucceeded = PR_FALSE;
            }
        }

        if (!mSucceeded) {
            // Update was not merged, mark all the loads as failures
            for (PRUint32 i = 0; i < mItems.Length(); i++) {
                mItems[i]->Cancel();
            }
        }
    }

    return service->UpdateFinished(this);
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdate::nsIOfflineCacheUpdate
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsOfflineCacheUpdate::GetUpdateDomain(nsACString &aUpdateDomain)
{
    NS_ENSURE_TRUE(mState >= STATE_INITIALIZED, NS_ERROR_NOT_INITIALIZED);

    aUpdateDomain = mUpdateDomain;
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdate::GetStatus(PRUint16 *aStatus)
{
    switch (mState) {
    case STATE_CHECKING :
        *aStatus = nsIDOMOfflineResourceList::CHECKING;
        return NS_OK;
    case STATE_DOWNLOADING :
        *aStatus = nsIDOMOfflineResourceList::DOWNLOADING;
        return NS_OK;
    default :
        *aStatus = nsIDOMOfflineResourceList::IDLE;
        return NS_OK;
    }

    return NS_ERROR_FAILURE;
}

NS_IMETHODIMP
nsOfflineCacheUpdate::GetPartial(PRBool *aPartial)
{
    *aPartial = mPartialUpdate;
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdate::GetManifestURI(nsIURI **aManifestURI)
{
    NS_ENSURE_TRUE(mState >= STATE_INITIALIZED, NS_ERROR_NOT_INITIALIZED);

    NS_IF_ADDREF(*aManifestURI = mManifestURI);
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdate::GetSucceeded(PRBool *aSucceeded)
{
    NS_ENSURE_TRUE(mState == STATE_FINISHED, NS_ERROR_NOT_AVAILABLE);

    *aSucceeded = mSucceeded;

    return NS_OK;
}

nsresult
nsOfflineCacheUpdate::AddURI(nsIURI *aURI, const nsACString &aOwnerSpec)
{
    NS_ENSURE_TRUE(mState >= STATE_INITIALIZED, NS_ERROR_NOT_INITIALIZED);

    if (mState >= STATE_DOWNLOADING)
        return NS_ERROR_NOT_AVAILABLE;

    // Manifest URIs must have the same scheme as the manifest.
    nsCAutoString scheme;
    aURI->GetScheme(scheme);

    PRBool match;
    if (NS_FAILED(mManifestURI->SchemeIs(scheme.get(), &match)) || !match)
        return NS_ERROR_FAILURE;

    // Save the cache key as an owned URI
    nsCAutoString spec;
    nsresult rv = aURI->GetSpec(spec);
    NS_ENSURE_SUCCESS(rv, rv);

    // url fragments aren't used in cache keys
    nsCAutoString::const_iterator specStart, specEnd;
    spec.BeginReading(specStart);
    spec.EndReading(specEnd);
    if (FindCharInReadable('#', specStart, specEnd)) {
        spec.BeginReading(specEnd);
        rv = mCacheSession->AddOwnedKey(mUpdateDomain, aOwnerSpec,
                                        Substring(specEnd, specStart));
        NS_ENSURE_SUCCESS(rv, rv);
    } else {
        rv = mCacheSession->AddOwnedKey(mUpdateDomain, aOwnerSpec, spec);
        NS_ENSURE_SUCCESS(rv, rv);
    }

    // Don't fetch the same URI twice.
    for (PRUint32 i = 0; i < mItems.Length(); i++) {
        PRBool equals;
        if (NS_SUCCEEDED(mItems[i]->mURI->Equals(aURI, &equals)) && equals) {
            return NS_OK;
        }
    }

    nsRefPtr<nsOfflineCacheUpdateItem> item =
        new nsOfflineCacheUpdateItem(this, aURI, mDocumentURI, mClientID);
    if (!item) return NS_ERROR_OUT_OF_MEMORY;

    mItems.AppendElement(item);
    mAddedItems = PR_TRUE;

    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdate::AddDynamicURI(nsIURI *aURI)
{
    return AddURI(aURI, mDynamicOwnerSpec);
}

NS_IMETHODIMP
nsOfflineCacheUpdate::GetCount(PRUint32 *aNumItems)
{
    LOG(("nsOfflineCacheUpdate::GetNumItems [%p, num=%d]",
         this, mItems.Length()));

    NS_ENSURE_TRUE(mState >= STATE_INITIALIZED, NS_ERROR_NOT_INITIALIZED);

    *aNumItems = mItems.Length();
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdate::Item(PRUint32 aIndex, nsIDOMLoadStatus **aItem)
{
    LOG(("nsOfflineCacheUpdate::GetItems [%p, index=%d]", this, aIndex));

    NS_ENSURE_TRUE(mState >= STATE_INITIALIZED, NS_ERROR_NOT_INITIALIZED);

    if (aIndex < mItems.Length())
        NS_IF_ADDREF(*aItem = mItems.ElementAt(aIndex));
    else
        *aItem = nsnull;

    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdate::AddObserver(nsIOfflineCacheUpdateObserver *aObserver,
                                  PRBool aHoldWeak)
{
    LOG(("nsOfflineCacheUpdate::AddObserver [%p]", this));

    NS_ENSURE_TRUE(mState >= STATE_INITIALIZED, NS_ERROR_NOT_INITIALIZED);

    if (aHoldWeak) {
        nsCOMPtr<nsIWeakReference> weakRef = do_GetWeakReference(aObserver);
        mWeakObservers.AppendObject(weakRef);
    } else {
        mObservers.AppendObject(aObserver);
    }

    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdate::RemoveObserver(nsIOfflineCacheUpdateObserver *aObserver)
{
    LOG(("nsOfflineCacheUpdate::RemoveObserver [%p]", this));

    NS_ENSURE_TRUE(mState >= STATE_INITIALIZED, NS_ERROR_NOT_INITIALIZED);

    for (PRInt32 i = 0; i < mWeakObservers.Count(); i++) {
        nsCOMPtr<nsIOfflineCacheUpdateObserver> observer =
            do_QueryReferent(mWeakObservers[i]);
        if (observer == aObserver) {
            mWeakObservers.RemoveObjectAt(i);
            return NS_OK;
        }
    }

    for (PRInt32 i = 0; i < mObservers.Count(); i++) {
        if (mObservers[i] == aObserver) {
            mObservers.RemoveObjectAt(i);
            return NS_OK;
        }
    }

    return NS_OK;
}


NS_IMETHODIMP
nsOfflineCacheUpdate::Schedule()
{
    LOG(("nsOfflineCacheUpdate::Schedule [%p]", this));

    nsOfflineCacheUpdateService* service =
        nsOfflineCacheUpdateService::EnsureService();

    if (!service) {
        return NS_ERROR_FAILURE;
    }

    return service->Schedule(this);
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateService::nsISupports
//-----------------------------------------------------------------------------

NS_IMPL_ISUPPORTS4(nsOfflineCacheUpdateService,
                   nsIOfflineCacheUpdateService,
                   nsIWebProgressListener,
                   nsIObserver,
                   nsISupportsWeakReference)

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateService <public>
//-----------------------------------------------------------------------------

nsOfflineCacheUpdateService::nsOfflineCacheUpdateService()
    : mDisabled(PR_FALSE)
    , mUpdateRunning(PR_FALSE)
{
}

nsOfflineCacheUpdateService::~nsOfflineCacheUpdateService()
{
    gOfflineCacheUpdateService = nsnull;
}

nsresult
nsOfflineCacheUpdateService::Init()
{
    nsresult rv;

#if defined(PR_LOGGING)
    if (!gOfflineCacheUpdateLog)
        gOfflineCacheUpdateLog = PR_NewLogModule("nsOfflineCacheUpdate");
#endif

    if (!mDocUpdates.Init())
        return NS_ERROR_FAILURE;

    // Observe xpcom-shutdown event
    nsCOMPtr<nsIObserverService> observerService =
        do_GetService("@mozilla.org/observer-service;1", &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = observerService->AddObserver(this,
                                      NS_XPCOM_SHUTDOWN_OBSERVER_ID,
                                      PR_TRUE);
    NS_ENSURE_SUCCESS(rv, rv);

    // Register as an observer for the document loader
    nsCOMPtr<nsIWebProgress> progress =
        do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID);
    if (progress) {
        nsresult rv = progress->AddProgressListener
                          (this, nsIWebProgress::NOTIFY_STATE_DOCUMENT);
        NS_ENSURE_SUCCESS(rv, rv);
    }

    gOfflineCacheUpdateService = this;

    return NS_OK;
}

/* static */
nsOfflineCacheUpdateService *
nsOfflineCacheUpdateService::GetInstance()
{
    if (!gOfflineCacheUpdateService) {
        gOfflineCacheUpdateService = new nsOfflineCacheUpdateService();
        if (!gOfflineCacheUpdateService)
            return nsnull;
        NS_ADDREF(gOfflineCacheUpdateService);
        nsresult rv = gOfflineCacheUpdateService->Init();
        if (NS_FAILED(rv)) {
            NS_RELEASE(gOfflineCacheUpdateService);
            return nsnull;
        }
        return gOfflineCacheUpdateService;
    }

    NS_ADDREF(gOfflineCacheUpdateService);

    return gOfflineCacheUpdateService;
}

/* static */
nsOfflineCacheUpdateService *
nsOfflineCacheUpdateService::EnsureService()
{
    if (!gOfflineCacheUpdateService) {
        // Make the service manager hold a long-lived reference to the service
        nsCOMPtr<nsIOfflineCacheUpdateService> service =
            do_GetService(NS_OFFLINECACHEUPDATESERVICE_CONTRACTID);
    }

    return gOfflineCacheUpdateService;
}

nsresult
nsOfflineCacheUpdateService::Schedule(nsOfflineCacheUpdate *aUpdate)
{
    LOG(("nsOfflineCacheUpdateService::Schedule [%p, update=%p]",
         this, aUpdate));

    nsresult rv;
    nsCOMPtr<nsIObserverService> observerService =
        do_GetService("@mozilla.org/observer-service;1", &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    observerService->NotifyObservers(static_cast<nsIOfflineCacheUpdate*>(aUpdate),
                                     "offline-cache-update-added",
                                     nsnull);

    mUpdates.AppendElement(aUpdate);

    ProcessNextUpdate();

    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateService::ScheduleOnDocumentStop(nsIURI *aManifestURI,
                                                    nsIURI *aDocumentURI,
                                                    nsIDOMDocument *aDocument)
{
    LOG(("nsOfflineCacheUpdateService::ScheduleOnDocumentStop [%p, manifestURI=%p, documentURI=%p doc=%p]",
         this, aManifestURI, aDocumentURI, aDocument));

    PendingUpdate *update = new PendingUpdate();
    update->mManifestURI = aManifestURI;
    update->mDocumentURI = aDocumentURI;
    if (!mDocUpdates.Put(aDocument, update))
        return NS_ERROR_FAILURE;

    return NS_OK;
}

nsresult
nsOfflineCacheUpdateService::UpdateFinished(nsOfflineCacheUpdate *aUpdate)
{
    LOG(("nsOfflineCacheUpdateService::UpdateFinished [%p, update=%p]",
         this, aUpdate));

    NS_ASSERTION(mUpdates.Length() > 0 &&
                 mUpdates[0] == aUpdate, "Unknown update completed");

    // keep this item alive until we're done notifying observers
    nsRefPtr<nsOfflineCacheUpdate> update = mUpdates[0];
    mUpdates.RemoveElementAt(0);
    mUpdateRunning = PR_FALSE;

    nsresult rv;
    nsCOMPtr<nsIObserverService> observerService =
        do_GetService("@mozilla.org/observer-service;1", &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    observerService->NotifyObservers(static_cast<nsIOfflineCacheUpdate*>(aUpdate),
                                     "offline-cache-update-completed",
                                     nsnull);

    ProcessNextUpdate();

    return NS_OK;
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateService <private>
//-----------------------------------------------------------------------------

nsresult
nsOfflineCacheUpdateService::ProcessNextUpdate()
{
    LOG(("nsOfflineCacheUpdateService::ProcessNextUpdate [%p, num=%d]",
         this, mUpdates.Length()));

    if (mDisabled)
        return NS_ERROR_ABORT;

    if (mUpdateRunning)
        return NS_OK;

    if (mUpdates.Length() > 0) {
        mUpdateRunning = PR_TRUE;
        return mUpdates[0]->Begin();
    }

    return NS_OK;
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateService::nsIOfflineCacheUpdateService
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsOfflineCacheUpdateService::GetNumUpdates(PRUint32 *aNumUpdates)
{
    LOG(("nsOfflineCacheUpdateService::GetNumUpdates [%p]", this));

    *aNumUpdates = mUpdates.Length();
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateService::GetUpdate(PRUint32 aIndex,
                                       nsIOfflineCacheUpdate **aUpdate)
{
    LOG(("nsOfflineCacheUpdateService::GetUpdate [%p, %d]", this, aIndex));

    if (aIndex < mUpdates.Length()) {
        NS_ADDREF(*aUpdate = mUpdates[aIndex]);
    } else {
        *aUpdate = nsnull;
    }

    return NS_OK;
}


NS_IMETHODIMP
nsOfflineCacheUpdateService::ScheduleUpdate(nsIURI *aManifestURI,
                                            nsIURI *aDocumentURI,
                                            nsIOfflineCacheUpdate **aUpdate)
{
    // Check for existing updates
    nsresult rv;
    for (PRUint32 i = 0; i < mUpdates.Length(); i++) {
        nsRefPtr<nsOfflineCacheUpdate> update = mUpdates[i];

        PRBool partial;
        rv = update->GetPartial(&partial);
        NS_ENSURE_SUCCESS(rv, rv);

        if (partial) {
            // Partial updates aren't considered
            continue;
        }

        nsCOMPtr<nsIURI> manifestURI;
        update->GetManifestURI(getter_AddRefs(manifestURI));
        if (manifestURI) {
            PRBool equals;
            rv = manifestURI->Equals(aManifestURI, &equals);
            if (equals) {
                NS_ADDREF(*aUpdate = update);
                return NS_OK;
            }
        }
    }

    // There is no existing update, start one.

    nsRefPtr<nsOfflineCacheUpdate> update = new nsOfflineCacheUpdate();
    if (!update)
        return NS_ERROR_OUT_OF_MEMORY;

    rv = update->Init(PR_FALSE, aManifestURI, aDocumentURI);
    NS_ENSURE_SUCCESS(rv, rv);

    rv = update->Schedule();
    NS_ENSURE_SUCCESS(rv, rv);

    NS_ADDREF(*aUpdate = update);

    return NS_OK;
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateService::nsIObserver
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsOfflineCacheUpdateService::Observe(nsISupports     *aSubject,
                                     const char      *aTopic,
                                     const PRUnichar *aData)
{
    if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
        if (mUpdates.Length() > 0)
            mUpdates[0]->Cancel();
        mDisabled = PR_TRUE;
    }

    return NS_OK;
}

//-----------------------------------------------------------------------------
// nsOfflineCacheUpdateService::nsIWebProgressListener
//-----------------------------------------------------------------------------

NS_IMETHODIMP
nsOfflineCacheUpdateService::OnProgressChange(nsIWebProgress *aProgress,
                                              nsIRequest *aRequest,
                                              PRInt32 curSelfProgress,
                                              PRInt32 maxSelfProgress,
                                              PRInt32 curTotalProgress,
                                              PRInt32 maxTotalProgress)
{
    NS_NOTREACHED("notification excluded in AddProgressListener(...)");
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateService::OnStateChange(nsIWebProgress* aWebProgress,
                                           nsIRequest *aRequest,
                                           PRUint32 progressStateFlags,
                                           nsresult aStatus)
{
    if ((progressStateFlags & STATE_IS_DOCUMENT) &&
        (progressStateFlags & STATE_STOP)) {
        if (mDocUpdates.Count() == 0)
            return NS_OK;

        nsCOMPtr<nsIDOMWindow> window;
        aWebProgress->GetDOMWindow(getter_AddRefs(window));
        if (!window) return NS_OK;

        nsCOMPtr<nsIDOMDocument> doc;
        window->GetDocument(getter_AddRefs(doc));
        if (!doc) return NS_OK;

        LOG(("nsOfflineCacheUpdateService::OnStateChange [%p, doc=%p]",
             this, doc.get()));


        PendingUpdate *pendingUpdate;
        if (mDocUpdates.Get(doc, &pendingUpdate)) {
            // Only schedule the update if the document loaded successfull
            if (NS_SUCCEEDED(aStatus)) {
                nsCOMPtr<nsIOfflineCacheUpdate> update;
                ScheduleUpdate(pendingUpdate->mManifestURI,
                               pendingUpdate->mDocumentURI,
                               getter_AddRefs(update));
            }
            mDocUpdates.Remove(doc);
        }

        return NS_OK;
    }

    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateService::OnLocationChange(nsIWebProgress* aWebProgress,
                                              nsIRequest* aRequest,
                                              nsIURI *location)
{
    NS_NOTREACHED("notification excluded in AddProgressListener(...)");
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateService::OnStatusChange(nsIWebProgress* aWebProgress,
                                            nsIRequest* aRequest,
                                            nsresult aStatus,
                                            const PRUnichar* aMessage)
{
    NS_NOTREACHED("notification excluded in AddProgressListener(...)");
    return NS_OK;
}

NS_IMETHODIMP
nsOfflineCacheUpdateService::OnSecurityChange(nsIWebProgress *aWebProgress,
                                              nsIRequest *aRequest,
                                              PRUint32 state)
{
    NS_NOTREACHED("notification excluded in AddProgressListener(...)");
    return NS_OK;
}

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