/* -*- 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
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Mitesh Shah <mitesh@netscape.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 ***** */

#ifdef MOZ_LOGGING
// sorry, this has to be before the pre-compiled header
#define FORCE_PR_LOG /* Allow logging in the release build */
#endif
#include "nsAutoConfig.h"
#include "nsIURI.h"
#include "nsIHttpChannel.h"
#include "nsIFileStreams.h"
#include "nsAppDirectoryServiceDefs.h"
#include "prmem.h"
#include "nsIProfile.h"
#include "nsIObserverService.h"
#include "nsIEventQueueService.h"
#include "nsLiteralString.h"
#include "nsIPromptService.h"
#include "nsIServiceManager.h"
#include "nsIStringBundle.h"
#include "nsCRT.h"
#include "nspr.h"

PRLogModuleInfo *MCD;

extern nsresult EvaluateAdminConfigScript(const char *js_buffer, size_t length,
                                          const char *filename, 
                                          PRBool bGlobalContext, 
                                          PRBool bCallbacks, 
                                          PRBool skipFirstLine);

// nsISupports Implementation

NS_IMPL_THREADSAFE_ISUPPORTS6(nsAutoConfig, nsIAutoConfig, nsITimerCallback, nsIStreamListener, nsIObserver, nsIRequestObserver, nsISupportsWeakReference)

nsAutoConfig::nsAutoConfig()
{
}

nsresult nsAutoConfig::Init()
{
    // member initializers and constructor code

    nsresult rv;
    mLoaded = PR_FALSE;
    
    // Registering the object as an observer to the profile-after-change topic
    nsCOMPtr<nsIObserverService> observerService =
        do_GetService("@mozilla.org/observer-service;1", &rv);
    if (NS_FAILED(rv)) 
        return rv;

    rv = observerService->AddObserver(this,"profile-after-change", PR_TRUE);
    
    return rv;
}

nsAutoConfig::~nsAutoConfig()
{
}

// attribute string configURL
NS_IMETHODIMP nsAutoConfig::GetConfigURL(char **aConfigURL)
{
    if (!aConfigURL) 
        return NS_ERROR_NULL_POINTER;

    if (mConfigURL.IsEmpty()) {
        *aConfigURL = nsnull;
        return NS_OK;
    }
    
    *aConfigURL = ToNewCString(mConfigURL);
    if (!*aConfigURL)
        return NS_ERROR_OUT_OF_MEMORY;
    return NS_OK;
}
NS_IMETHODIMP nsAutoConfig::SetConfigURL(const char *aConfigURL)
{
    if (!aConfigURL)
        return NS_ERROR_NULL_POINTER;
    mConfigURL.Assign(aConfigURL);
    return NS_OK;
}

NS_IMETHODIMP
nsAutoConfig::OnStartRequest(nsIRequest *request, nsISupports *context)
{
    return NS_OK;
}


NS_IMETHODIMP
nsAutoConfig::OnDataAvailable(nsIRequest *request, 
                              nsISupports *context,
                              nsIInputStream *aIStream, 
                              PRUint32 aSourceOffset,
                              PRUint32 aLength)
{    
    PRUint32 amt, size;
    nsresult rv;
    char buf[1024];
    
    while (aLength) {
        size = PR_MIN(aLength, sizeof(buf));
        rv = aIStream->Read(buf, size, &amt);
        if (NS_FAILED(rv))
            return rv;
        mBuf.Append(buf, amt);
        aLength -= amt;
    }
    return NS_OK;
}


NS_IMETHODIMP
nsAutoConfig::OnStopRequest(nsIRequest *request, nsISupports *context,
                            nsresult aStatus)
{
    nsresult rv;

    // If the request is failed, go read the failover.jsc file
    if (NS_FAILED(aStatus)) {
        PR_LOG(MCD, PR_LOG_DEBUG, ("mcd request failed with status %x\n", aStatus));
        return readOfflineFile();
    }

    // Checking for the http response, if failure go read the failover file.
    nsCOMPtr<nsIHttpChannel> pHTTPCon(do_QueryInterface(request));
    if (pHTTPCon) {
        PRUint32 httpStatus;
        pHTTPCon->GetResponseStatus(&httpStatus);
        if (httpStatus != 200) 
        {
            PR_LOG(MCD, PR_LOG_DEBUG, ("mcd http request failed with status %x\n", httpStatus));
            return readOfflineFile();
        }
    }
    
    // Send the autoconfig.jsc to javascript engine.
    
    rv = EvaluateAdminConfigScript(mBuf.get(), mBuf.Length(),
                              nsnull, PR_FALSE,PR_TRUE, PR_FALSE);
    if (NS_SUCCEEDED(rv)) {

        // Write the autoconfig.jsc to failover.jsc (cached copy) 
        rv = writeFailoverFile(); 

        if (NS_FAILED(rv)) 
            NS_WARNING("Error writing failover.jsc file");

        // Releasing the lock to allow the main thread to start execution
        mLoaded = PR_TRUE;  

        return NS_OK;
    }
    // there is an error in parsing of the autoconfig file.
    NS_WARNING("Error reading autoconfig.jsc from the network, reading the offline version");
    return readOfflineFile();
}

// Notify method as a TimerCallBack function 
NS_IMETHODIMP nsAutoConfig::Notify(nsITimer *timer) 
{
    downloadAutoConfig();
    return NS_OK;
}

/* Observe() is called twice: once at the instantiation time and other 
   after the profile is set. It doesn't do anything but return NS_OK during the
   creation time. Second time it calls  downloadAutoConfig().
*/

NS_IMETHODIMP nsAutoConfig::Observe(nsISupports *aSubject, 
                                    const char *aTopic, 
                                    const PRUnichar *someData)
{
    nsresult rv = NS_OK;
    if (!nsCRT::strcmp(aTopic, "profile-after-change")) {

        // Getting the current profile name since we already have the 
        // pointer to the object.
        nsCOMPtr<nsIProfile> profile = do_QueryInterface(aSubject);
        if (profile) {
            nsXPIDLString profileName;
            rv = profile->GetCurrentProfile(getter_Copies(profileName));
            if (NS_SUCCEEDED(rv)) {
                // setting the member variable to the current profile name
                CopyUTF16toUTF8(profileName, mCurrProfile);
            }
            else {
                NS_WARNING("nsAutoConfig::GetCurrentProfile() failed");
            }
        } 

        // We will be calling downloadAutoConfig even if there is no profile 
        // name. Nothing will be passed as a parameter to the URL and the
        // default case will be picked up by the script.
        
        rv = downloadAutoConfig();

    }  
   
    return rv;
}

nsresult nsAutoConfig::downloadAutoConfig()
{
    nsresult rv;
    nsCAutoString emailAddr;
    nsXPIDLCString urlName;
    PRBool appendMail = PR_FALSE, offline = PR_FALSE;
    static PRBool firstTime = PR_TRUE;
    
    if (mConfigURL.IsEmpty()) {
        PR_LOG(MCD, PR_LOG_DEBUG, ("global config url is empty - did you set autoadmin.global_config_url?\n"));
        NS_WARNING("AutoConfig called without global_config_url");
        return NS_OK;
    }
    
    // If there is an email address appended as an argument to the ConfigURL
    // in the previous read, we need to remove it when timer kicks in and 
    // downloads the autoconfig file again. 
    // If necessary, the email address will be added again as an argument.
    PRInt32 index = mConfigURL.RFindChar((PRUnichar)'?');
    if (index != -1)
        mConfigURL.Truncate(index);

    // Clean up the previous read, the new read is going to use the same buffer
    if (!mBuf.IsEmpty())
        mBuf.Truncate(0);

    // Get the preferences branch and save it to the member variable
    if (!mPrefBranch) {

        nsCOMPtr<nsIPrefService> prefs =
            do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
        if (NS_FAILED(rv)) 
            return rv;
    
        rv = prefs->GetBranch(nsnull,getter_AddRefs(mPrefBranch));
        if (NS_FAILED(rv))
            return rv;
    }
    
    // Check to see if the network is online/offline 
    nsCOMPtr<nsIIOService> ios = do_GetService(NS_IOSERVICE_CONTRACTID, &rv);
    if (NS_FAILED(rv)) 
        return rv;
    
    rv = ios->GetOffline(&offline);
    if (NS_FAILED(rv)) 
        return rv;
    
    if (offline) {
        
        PRBool offlineFailover = PR_FALSE;
        rv = mPrefBranch->GetBoolPref("autoadmin.offline_failover", 
                                      &offlineFailover);
        
        // Read the failover.jsc if the network is offline and the pref says so
        if (offlineFailover) {
            return readOfflineFile();
        }
    }


    /* Append user's identity at the end of the URL if the pref says so.
       First we are checking for the user's email address but if it is not
       available in the case where the client is used without messenger, user's
       profile name will be used as an unique identifier
    */
    
    rv = mPrefBranch->GetBoolPref("autoadmin.append_emailaddr", &appendMail);
    
    if (NS_SUCCEEDED(rv) && appendMail) {
        rv = getEmailAddr(emailAddr);
        if (NS_SUCCEEDED(rv) && emailAddr.get()) {

            /* Adding the unique identifier at the end of autoconfig URL. 
               In this case the autoconfig URL is a script and 
               emailAddr as passed as an argument 
            */
            mConfigURL.Append("?");
            mConfigURL.Append(emailAddr); 
        }
    }
    
    // create a new url 
    nsCOMPtr<nsIURI> url;
    nsCOMPtr<nsIChannel> channel;
    
    rv = NS_NewURI(getter_AddRefs(url), mConfigURL.get(), nsnull, nsnull);
    if (NS_FAILED(rv))
    {
        PR_LOG(MCD, PR_LOG_DEBUG, ("failed to create URL - is autoadmin.global_config_url valid? - %s\n", mConfigURL.get()));
        return rv;
    }

    PR_LOG(MCD, PR_LOG_DEBUG, ("running MCD url %s\n", mConfigURL.get()));
    // open a channel for the url
    rv = NS_NewChannel(getter_AddRefs(channel),url, nsnull, nsnull, nsnull, nsIRequest::INHIBIT_PERSISTENT_CACHING | nsIRequest::LOAD_BYPASS_CACHE);
    if (NS_FAILED(rv)) 
        return rv;

    
    rv = channel->AsyncOpen(this, nsnull); 
    if (NS_FAILED(rv)) {
        readOfflineFile();
        return rv;
    }
    
    // Set a repeating timer if the pref is set.
    // This is to be done only once.
    // Also We are having the event queue processing only for the startup
    // It is not needed with the repeating timer.
    if (firstTime) {

        firstTime = PR_FALSE;
    
        // Getting an event queue. If we start an AsyncOpen, the thread
        // needs to wait before the reading of autoconfig is done

        nsCOMPtr<nsIEventQueueService> service = 
            do_GetService(NS_EVENTQUEUESERVICE_CONTRACTID, &rv);
        if (NS_FAILED(rv)) 
            return rv;

        nsCOMPtr<nsIEventQueue> currentThreadQ;
        rv = service->GetThreadEventQueue(NS_CURRENT_THREAD,
                                          getter_AddRefs(currentThreadQ));
        if (NS_FAILED(rv)) 
            return rv;
    
        /* process events until we're finished. AutoConfig.jsc reading needs
           to be finished before the browser starts loading up
           We are waiting for the mLoaded which will be set through 
           onStopRequest or readOfflineFile methods
           There is a possibility of deadlock so we need to make sure
           that mLoaded will be set to true in any case (success/failure)
        */
        
        while (!mLoaded) {

            PRBool isEventPending;
            rv = currentThreadQ->PendingEvents(&isEventPending);
            if (NS_FAILED(rv)) 
                return rv;        
            if (isEventPending) {
                rv = currentThreadQ->ProcessPendingEvents();
                if (NS_FAILED(rv)) 
                    return rv;        
            }
        }
        
        PRInt32 minutes = 0;
        rv = mPrefBranch->GetIntPref("autoadmin.refresh_interval", 
                                     &minutes);
        if (NS_SUCCEEDED(rv) && minutes > 0) {

            // Create a new timer and pass this nsAutoConfig 
            // object as a timer callback. 
            mTimer = do_CreateInstance("@mozilla.org/timer;1",&rv);
            if (NS_FAILED(rv)) 
                return rv;
            rv = mTimer->InitWithCallback(this, minutes * 60 * 1000, 
                             nsITimer::TYPE_REPEATING_SLACK);
            if (NS_FAILED(rv)) 
                return rv;
        }
    
    } //first_time
    
    return NS_OK;

} // nsPref::downloadAutoConfig()



nsresult nsAutoConfig::readOfflineFile()
{
    PRBool failCache = PR_TRUE;
    nsresult rv;
    PRBool offline;
    
    /* Releasing the lock to allow main thread to start 
       execution. At this point we do not need to stall 
       the thread since all network activities are done.
    */
    mLoaded = PR_TRUE; 

    rv = mPrefBranch->GetBoolPref("autoadmin.failover_to_cached", &failCache);
    
    if (failCache == PR_FALSE) {
        
        // disable network connections and return.
        
        nsCOMPtr<nsIIOService> ios =
            do_GetService(NS_IOSERVICE_CONTRACTID, &rv);
        if (NS_FAILED(rv)) 
            return rv;
        
        rv = ios->GetOffline(&offline);
        if (NS_FAILED(rv)) 
            return rv;

        if (!offline) {
            rv = ios->SetOffline(PR_TRUE);
            if (NS_FAILED(rv)) 
                return rv;
        }
        
        // lock the "network.online" prference so user cannot toggle back to
        // online mode.
        rv = mPrefBranch->SetBoolPref("network.online", PR_FALSE);
        if (NS_FAILED(rv)) 
            return rv;
        mPrefBranch->LockPref("network.online");
        return NS_OK;
    }
    
    /* faiover_to_cached is set to true so 
       Open the file and read the content.
       execute the javascript file
    */
    
    nsCOMPtr<nsIFile> failoverFile; 
    rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
                                getter_AddRefs(failoverFile));
    if (NS_FAILED(rv)) 
        return rv;
    
    failoverFile->AppendNative(NS_LITERAL_CSTRING("failover.jsc"));
    rv = evaluateLocalFile(failoverFile);
    if (NS_FAILED(rv)) 
        NS_WARNING("Couldn't open failover.jsc, going back to default prefs");
    return NS_OK;
}

nsresult nsAutoConfig::evaluateLocalFile(nsIFile *file)
{
    nsresult rv;
    nsCOMPtr<nsIInputStream> inStr;
    
    rv = NS_NewLocalFileInputStream(getter_AddRefs(inStr), file);
    if (NS_FAILED(rv)) 
        return rv;
        
    PRInt64 fileSize;
    PRUint32 fs, amt=0;
    file->GetFileSize(&fileSize);
    LL_L2UI(fs, fileSize); // Converting 64 bit structure to unsigned int
    char *buf = (char *)PR_Malloc(fs * sizeof(char));
    if (!buf) 
        return NS_ERROR_OUT_OF_MEMORY;
    
    rv = inStr->Read(buf, fs, &amt);
    if (NS_SUCCEEDED(rv)) {
      EvaluateAdminConfigScript(buf, fs, nsnull, PR_FALSE, 
                                PR_TRUE, PR_FALSE);
    }
    inStr->Close();
    PR_Free(buf);
    return rv;
}

nsresult nsAutoConfig::writeFailoverFile()
{
    nsresult rv;
    nsCOMPtr<nsIFile> failoverFile; 
    nsCOMPtr<nsIOutputStream> outStr;
    PRUint32 amt;
    
    rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
                                getter_AddRefs(failoverFile));
    if (NS_FAILED(rv)) 
        return rv;
    
    failoverFile->AppendNative(NS_LITERAL_CSTRING("failover.jsc"));
    
    rv = NS_NewLocalFileOutputStream(getter_AddRefs(outStr), failoverFile);
    if (NS_FAILED(rv)) 
        return rv;
    rv = outStr->Write(mBuf.get(),mBuf.Length(),&amt);
    outStr->Close();
    return rv;
}

nsresult nsAutoConfig::getEmailAddr(nsACString & emailAddr)
{
    
    nsresult rv;
    nsXPIDLCString prefValue;
    
    /* Getting an email address through set of three preferences:
       First getting a default account with 
       "mail.accountmanager.defaultaccount"
       second getting an associated id with the default account
       Third getting an email address with id
    */
    
    rv = mPrefBranch->GetCharPref("mail.accountmanager.defaultaccount", 
                                  getter_Copies(prefValue));
    
    if (NS_SUCCEEDED(rv) && !prefValue.IsEmpty()) {
        emailAddr = NS_LITERAL_CSTRING("mail.account.") +
            prefValue + NS_LITERAL_CSTRING(".identities");
        rv = mPrefBranch->GetCharPref(PromiseFlatCString(emailAddr).get(),
                                      getter_Copies(prefValue));
        if (NS_FAILED(rv) || prefValue.IsEmpty())
            return PromptForEMailAddress(emailAddr);
        emailAddr = NS_LITERAL_CSTRING("mail.identity.") +
            prefValue + NS_LITERAL_CSTRING(".useremail");
        rv = mPrefBranch->GetCharPref(PromiseFlatCString(emailAddr).get(),
                                      getter_Copies(prefValue));
        if (NS_FAILED(rv)  || prefValue.IsEmpty())
            return PromptForEMailAddress(emailAddr);
        emailAddr = prefValue;
    }
    else {
        // look for 4.x pref in case we just migrated.
        rv = mPrefBranch->GetCharPref("mail.identity.useremail", 
                                  getter_Copies(prefValue));
        if (NS_SUCCEEDED(rv) && !prefValue.IsEmpty())
            emailAddr = prefValue;
        else if (NS_FAILED(PromptForEMailAddress(emailAddr))  && (!mCurrProfile.IsEmpty()))
            emailAddr = mCurrProfile;
    }
    
    return NS_OK;
}
        
nsresult nsAutoConfig::PromptForEMailAddress(nsACString &emailAddress)
{
    nsresult rv;
    nsCOMPtr<nsIPromptService> promptService = do_GetService("@mozilla.org/embedcomp/prompt-service;1", &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    nsCOMPtr<nsIStringBundleService> bundleService = do_GetService(NS_STRINGBUNDLE_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIStringBundle> bundle;
    rv = bundleService->CreateBundle("chrome://autoconfig/locale/autoconfig.properties",
                                getter_AddRefs(bundle));
    NS_ENSURE_SUCCESS(rv, rv);

    nsXPIDLString title;
    rv = bundle->GetStringFromName(NS_LITERAL_STRING("emailPromptTitle").get(), getter_Copies(title));
    NS_ENSURE_SUCCESS(rv, rv);

    nsXPIDLString err;
    rv = bundle->GetStringFromName(NS_LITERAL_STRING("emailPromptMsg").get(), getter_Copies(err));
    NS_ENSURE_SUCCESS(rv, rv);
    PRBool check = PR_FALSE;
    nsXPIDLString emailResult;
    PRBool success;
    rv = promptService->Prompt(nsnull, title.get(), err.get(), getter_Copies(emailResult), nsnull, &check, &success);
    if (!success)
      return NS_ERROR_FAILURE;
    NS_ENSURE_SUCCESS(rv, rv);
    CopyUCS2toASCII(emailResult, emailAddress);
    return NS_OK;
}

