/* Implementation for NSHTTPCookieStorage for GNUstep
   Copyright (C) 2006 Software Foundation, Inc.

   Written by:  Richard Frith-Macdonald <rfm@gnu.org>
   Date: 2006
   
   This file is part of the GNUstep Base Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
   
   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02111 USA.
   */ 

#import "common.h"
#define	EXPOSE_NSHTTPCookieStorage_IVARS	1
#import "GSURLPrivate.h"
#import "Foundation/NSSet.h"
#import "Foundation/NSArray.h"
#import "Foundation/NSFileManager.h"
#import "Foundation/NSPathUtilities.h"
#import "Foundation/NSString.h"
#import "Foundation/NSDistributedNotificationCenter.h"
#import "GNUstepBase/NSObject+GNUstepBase.h"

NSString * const NSHTTPCookieManagerAcceptPolicyChangedNotification
  = @"NSHTTPCookieManagerAcceptPolicyChangedNotification";

NSString * const NSHTTPCookieManagerCookiesChangedNotification
  = @"NSHTTPCookieManagerCookiesChangedNotification";

NSString *objectObserver = @"org.GNUstep.NSHTTPCookieStorage";

// Internal data storage
typedef struct {
  NSHTTPCookieAcceptPolicy	_policy;
  NSMutableArray		*_cookies;
} Internal;
 
#define	this	((Internal*)(self->_NSHTTPCookieStorageInternal))
#define	inst	((Internal*)(o->_NSHTTPCookieStorageInternal))

@interface NSHTTPCookieStorage (Private)
- (void) _updateFromCookieStore;
@end

@implementation NSHTTPCookieStorage

static NSHTTPCookieStorage   *storage = nil;

+ (id) allocWithZone: (NSZone*)z
{
  return RETAIN([self sharedHTTPCookieStorage]);
}

+ (NSHTTPCookieStorage *) sharedHTTPCookieStorage
{
  if (storage == nil)
    {
      [gnustep_global_lock lock];
      if (storage == nil)
        {
	  NSHTTPCookieStorage	*o;

	  o = (NSHTTPCookieStorage*)
	    NSAllocateObject(self, 0, NSDefaultMallocZone());
	  o->_NSHTTPCookieStorageInternal = (Internal*)
	    NSZoneCalloc(NSDefaultMallocZone(), 1, sizeof(Internal));
	  [o init];
	  storage = o;
	}
      [gnustep_global_lock unlock];
    }
  return storage;
}

- init
{
  this->_policy = NSHTTPCookieAcceptPolicyAlways;
  this->_cookies = [NSMutableArray new];
  [[NSDistributedNotificationCenter defaultCenter] 
    addObserver: self
    selector: @selector(cookiesChangedNotification:)
    name: NSHTTPCookieManagerCookiesChangedNotification
    object: objectObserver];
  [[NSDistributedNotificationCenter defaultCenter] 
    addObserver: self
    selector: @selector(acceptPolicyChangeNotification:)
    name: NSHTTPCookieManagerAcceptPolicyChangedNotification
    object: objectObserver];
  [self _updateFromCookieStore];
  return self;
}

- (void) dealloc
{
  if (this != 0)
    {
      [[NSDistributedNotificationCenter defaultCenter] removeObserver: self];
      RELEASE(this->_cookies);
      NSZoneFree([self zone], this);
    }
  [super dealloc];
}

- (NSString *) _cookieStorePath
{
  BOOL isDir;
  NSString *path;
  NSArray *dirs;

  dirs = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, 
  	  NSUserDomainMask, YES);
  path = [[dirs objectAtIndex: 0] stringByAppendingPathComponent: @"Cookies"];
  if ([[NSFileManager defaultManager] 
        fileExistsAtPath: path isDirectory: &isDir] == NO || isDir == NO)
    {
      BOOL ok;
      ok = [[NSFileManager defaultManager] createDirectoryAtPath: path 
      	      withIntermediateDirectories: YES attributes: nil error: NULL];
      if (ok == NO)
        return nil; 
    }
  path = [path stringByAppendingPathComponent: @"Cookies.plist"];
  return path;
}

/* Remove all cookies that have expired */
/* FIXME: When will we know that the user session expired? */
- (BOOL) _expireCookies: (BOOL)endUserSession
{
  BOOL changed = NO;
  NSDate *now = [NSDate date];
  unsigned count = [this->_cookies count];

  /* FIXME: Handle Max-age */
  while (count-- > 0)
    {
      NSHTTPCookie	*ck = [this->_cookies objectAtIndex: count];
      NSDate *expDate = [ck expiresDate];
      if ((endUserSession && expDate == nil) ||
	  (expDate != nil && [expDate compare: now] != NSOrderedDescending))
        {
          [this->_cookies removeObject: ck];
	  changed = YES;
	}
    }
  return changed;
}

- (void) _updateFromCookieStore
{
  int i;
  NSArray *properties;
  NSString *path = [self _cookieStorePath];
  if (path == nil)
    {
      return;
    }
  properties = nil;
  NS_DURING
    properties = [[NSString stringWithContentsOfFile: path] propertyList];
  NS_HANDLER
    NSLog(@"NSHTTPCookieStorage: Error reading cookies plist");
  NS_ENDHANDLER
  if (properties == nil) 
    return;
  for (i = 0; i < [properties count]; i++)
    [this->_cookies addObject: 
      [NSHTTPCookie cookieWithProperties: [properties objectAtIndex: i]]];
}

- (void) _updateToCookieStore
{
  int i, count;
  NSMutableArray *properties;
  NSString *path = [self _cookieStorePath];
  if (path == nil)
    {
      return;
    }
  count = [this->_cookies count];
  properties = [NSMutableArray arrayWithCapacity: count];
  for (i = 0; i < count; i++) 
    [properties addObject: [[this->_cookies objectAtIndex: i] properties]];
  [properties writeToFile: path atomically: YES];
}

- (void) _doExpireUpdateAndNotify
{
  [self _expireCookies: NO];
  [self _updateToCookieStore];
  [[NSDistributedNotificationCenter defaultCenter] 
    postNotificationName: NSHTTPCookieManagerCookiesChangedNotification
    object: objectObserver];
}

- (void) cookiesChangedNotification: (NSNotification *)note
{
  if ([note object] == self)
    return;
  [self _updateFromCookieStore];
}

- (void) acceptPolicyChangeNotification: (NSNotification *)note
{
  if ([note object] == self)
    return;
  /* FIXME: Do we need a common place to store the policy? */
}

- (NSHTTPCookieAcceptPolicy) cookieAcceptPolicy
{
  return this->_policy;
}

- (NSArray *) cookies
{
  return [[this->_cookies copy] autorelease];
}

- (NSArray *) cookiesForURL: (NSURL *)URL
{
  NSMutableArray *a = [NSMutableArray array];
  NSEnumerator *ckenum = [this->_cookies objectEnumerator];
  NSHTTPCookie *cookie;
  NSString *receive_domain = [URL host];

  while ((cookie = [ckenum nextObject]))
    {
      if ([receive_domain hasSuffix: [cookie domain]])
        [a addObject: cookie];
    }
  return a;
}

- (void) deleteCookie: (NSHTTPCookie *)cookie
{
  if ([this->_cookies indexOfObject: cookie] != NSNotFound)
    {
      [this->_cookies removeObject: cookie];
      [self _doExpireUpdateAndNotify];
    }
  else
    NSLog(@"NSHTTPCookieStorage: trying to delete a cookie that is not in the storage");
}

- (void) _setCookieNoNotify: (NSHTTPCookie *)cookie
{
  NSEnumerator *ckenum = [this->_cookies objectEnumerator];
  NSHTTPCookie *ck, *remove_ck;
  NSString *name = [cookie name];
  NSString *path = [cookie path];
  NSString *domain = [cookie domain];

  NSAssert([cookie isKindOfClass: [NSHTTPCookie class]] == YES,
    NSInvalidArgumentException);
  
  remove_ck = nil;
  while ((ck = [ckenum nextObject]))
    {
      if ([name isEqual: [ck name]] && [path isEqual: [ck path]])
        {
	  /* The Apple documentation says the domain should match and 
	  RFC 2965 says they should match, though the original Netscape docs 
	  doesn't mention that the domain should match, so here, if the
	  version is explicitely set to 0, we don't require it */
	  id ckv = [[ck properties] objectForKey: NSHTTPCookieVersion];
	  if ((ckv && [ckv intValue] == 0) || [domain isEqual: [ck domain]])
	    {
	      remove_ck = ck;
	      break;
	    }
	}
    }
  if (remove_ck)
    [this->_cookies removeObject: remove_ck];
  
  [this->_cookies addObject: cookie];
}

- (void) setCookie: (NSHTTPCookie *)cookie
{
  if (this->_policy == NSHTTPCookieAcceptPolicyNever)
    return;
  [self _setCookieNoNotify: cookie];
  [self _doExpireUpdateAndNotify];
}

- (void) setCookieAcceptPolicy: (NSHTTPCookieAcceptPolicy)cookieAcceptPolicy
{
  this->_policy = cookieAcceptPolicy;
  [[NSDistributedNotificationCenter defaultCenter] 
    postNotificationName: NSHTTPCookieManagerAcceptPolicyChangedNotification
    object: objectObserver];
}

- (void) setCookies: (NSArray *)cookies
	     forURL: (NSURL *)URL
    mainDocumentURL: (NSURL *)mainDocumentURL
{
  BOOL     changed = NO;
  unsigned count = [cookies count];

  if (count == 0 || this->_policy == NSHTTPCookieAcceptPolicyNever)
    return;

  while (count-- > 0)
    {
      NSHTTPCookie	*ck = [cookies objectAtIndex: count];

      if (this->_policy == NSHTTPCookieAcceptPolicyOnlyFromMainDocumentDomain
          && [[URL host] hasSuffix: [mainDocumentURL host]] == NO)
	continue;

      [self _setCookieNoNotify: ck];
      changed = YES;
    }
  if (changed)
    [self _doExpireUpdateAndNotify];
}

@end