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/*
* Copyright 2010 Facebook
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "Facebook.h"
#import "FBLoginDialog.h"
#import "FBRequest.h"
#import "FBError.h"
#import "FBSessionManualTokenCachingStrategy.h"
#import "JSON.h"
#import "FBSession+Internal.h"
#import "FBUtility.h"
static NSString* kDialogBaseURL = @"https://m." FB_BASE_URL "/dialog/";
static NSString* kGraphBaseURL = @"https://graph." FB_BASE_URL "/";
static NSString* kRestserverBaseURL = @"https://api." FB_BASE_URL "/method/";
static NSString* kFBAppAuthURLScheme = @"fbauth";
static NSString* kFBAppAuthURLPath = @"authorize";
static NSString* kRedirectURL = @"fbconnect://success";
static NSString* kLogin = @"oauth";
static NSString* kApprequests = @"apprequests";
static NSString* kSDKVersion = @"2";
// If the last time we extended the access token was more than 24 hours ago
// we try to refresh the access token again.
static const int kTokenExtendThreshold = 24;
static NSString *requestFinishedKeyPath = @"state";
static void *finishedContext = @"finishedContext";
static void *tokenContext = @"tokenContext";
// the following const strings name properties for which KVO is manually handled
static NSString *const FBaccessTokenPropertyName = @"accessToken";
static NSString *const FBexpirationDatePropertyName = @"expirationDate";
///////////////////////////////////////////////////////////////////////////////////////////////////
@interface Facebook () <FBRequestDelegate>
// private properties
@property(nonatomic, copy) NSString* appId;
// session and tokenCaching object implement login logic and token state in Facebook class
@property(nonatomic, readwrite, retain) FBSession *session;
@property(nonatomic) BOOL hasUpdatedAccessToken;
@property(nonatomic, retain) FBSessionManualTokenCachingStrategy *tokenCaching;
@end
///////////////////////////////////////////////////////////////////////////////////////////////////
@implementation Facebook
@synthesize sessionDelegate = _sessionDelegate,
urlSchemeSuffix = _urlSchemeSuffix,
appId = _appId,
session = _session,
hasUpdatedAccessToken = _hasUpdatedAccessToken,
tokenCaching = _tokenCaching;
///////////////////////////////////////////////////////////////////////////////////////////////////
// private
- (id)initWithAppId:(NSString *)appId
andDelegate:(id<FBSessionDelegate>)delegate {
self = [self initWithAppId:appId urlSchemeSuffix:nil andDelegate:delegate];
return self;
}
/**
* Initialize the Facebook object with application ID.
*
* @param appId the facebook app id
* @param urlSchemeSuffix
* urlSchemeSuffix is a string of lowercase letters that is
* appended to the base URL scheme used for Facebook Login. For example,
* if your facebook ID is "350685531728" and you set urlSchemeSuffix to
* "abcd", the Facebook app will expect your application to bind to
* the following URL scheme: "fb350685531728abcd".
* This is useful if your have multiple iOS applications that
* share a single Facebook application id (for example, if you
* have a free and a paid version on the same app) and you want
* to use Facebook Login with both apps. Giving both apps different
* urlSchemeSuffix values will allow the Facebook app to disambiguate
* their URL schemes and always redirect the user back to the
* correct app, even if both the free and the app is installed
* on the device.
* urlSchemeSuffix is supported on version 3.4.1 and above of the Facebook
* app. If the user has an older version of the Facebook app
* installed and your app uses urlSchemeSuffix parameter, the SDK will
* proceed as if the Facebook app isn't installed on the device
* and redirect the user to Safari.
* @param delegate the FBSessionDelegate
*/
- (id)initWithAppId:(NSString *)appId
urlSchemeSuffix:(NSString *)urlSchemeSuffix
andDelegate:(id<FBSessionDelegate>)delegate {
self = [super init];
if (self) {
_requests = [[NSMutableSet alloc] init];
_lastAccessTokenUpdate = [[NSDate distantPast] retain];
_frictionlessRequestSettings = [[FBFrictionlessRequestSettings alloc] init];
_tokenCaching = [[FBSessionManualTokenCachingStrategy alloc] init];
self.appId = appId;
self.sessionDelegate = delegate;
self.urlSchemeSuffix = urlSchemeSuffix;
// observe tokenCaching properties so we can forward KVO
[self.tokenCaching addObserver:self
forKeyPath:FBaccessTokenPropertyName
options:NSKeyValueObservingOptionPrior
context:tokenContext];
[self.tokenCaching addObserver:self
forKeyPath:FBexpirationDatePropertyName
options:NSKeyValueObservingOptionPrior
context:tokenContext];
}
return self;
}
/**
* Override NSObject : free the space
*/
- (void)dealloc {
[_session release];
[_tokenCaching release];
for (FBRequest* _request in _requests) {
[_request removeObserver:self forKeyPath:requestFinishedKeyPath];
}
[_lastAccessTokenUpdate release];
[_requests release];
[_fbDialog release];
[_appId release];
[_urlSchemeSuffix release];
[_frictionlessRequestSettings release];
[super dealloc];
}
- (void)invalidateSession {
[self.session close];
[self.tokenCaching clearToken];
[FBSession deleteFacebookCookies];
// setting to nil also terminates any active request for whitelist
[_frictionlessRequestSettings updateRecipientCacheWithRecipients:nil];
}
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
- (void)observeFinishedContextValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change {
FBRequest* _request = (FBRequest*)object;
FBRequestState requestState = [_request state];
if (requestState == kFBRequestStateComplete) {
if ([_request sessionDidExpire]) {
[self invalidateSession];
if ([self.sessionDelegate respondsToSelector:@selector(fbSessionInvalidated)]) {
[self.sessionDelegate fbSessionInvalidated];
}
}
[_request removeObserver:self forKeyPath:requestFinishedKeyPath];
[_requests removeObject:_request];
}
}
#pragma GCC diagnostic pop
- (void)observeTokenContextValueForKeyPath:(NSString *)keyPath
change:(NSDictionary *)change {
// here we are forwarding KVO notifications from an inner object
if ([change objectForKey:NSKeyValueChangeNotificationIsPriorKey]) {
[self willChangeValueForKey:keyPath];
} else {
[self didChangeValueForKey:keyPath];
}
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
// dispatch for various observe cases
if (context == finishedContext) {
[self observeFinishedContextValueForKeyPath:keyPath
ofObject:object
change:change];
} else if (context == tokenContext) {
[self observeTokenContextValueForKeyPath:keyPath
change:change];
} else {
[super observeValueForKeyPath:keyPath
ofObject:object
change:change
context:context];
}
}
/**
* A private function for getting the app's base url.
*/
- (NSString *)getOwnBaseUrl {
return [NSString stringWithFormat:@"fb%@%@://authorize",
_appId,
_urlSchemeSuffix ? _urlSchemeSuffix : @""];
}
/**
* A function for parsing URL parameters.
*/
- (NSDictionary*)parseURLParams:(NSString *)query {
NSArray *pairs = [query componentsSeparatedByString:@"&"];
NSMutableDictionary *params = [[[NSMutableDictionary alloc] init] autorelease];
for (NSString *pair in pairs) {
NSArray *kv = [pair componentsSeparatedByString:@"="];
NSString *val =
[[kv objectAtIndex:1]
stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[params setObject:val forKey:[kv objectAtIndex:0]];
}
return params;
}
- (void)updateSessionIfTokenUpdated {
if (self.hasUpdatedAccessToken) {
self.hasUpdatedAccessToken = NO;
// invalidate current session and create a new one with the same permissions
NSArray *permissions = self.session.permissions;
[self.session close];
self.session = [[[FBSession alloc] initWithAppID:_appId
permissions:permissions
urlSchemeSuffix:_urlSchemeSuffix
tokenCacheStrategy:self.tokenCaching]
autorelease];
// get the session into a valid state
[self.session openWithCompletionHandler:nil];
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
//public
/**
* Starts a dialog which prompts the user to log in to Facebook and grant
* the requested permissions to the application.
*
* If the device supports multitasking, we use fast app switching to show
* the dialog in the Facebook app or, if the Facebook app isn't installed,
* in Safari (this enables Facebook Login by allowing multiple apps on
* the device to share the same user session).
* When the user grants or denies the permissions, the app that
* showed the dialog (the Facebook app or Safari) redirects back to
* the calling application, passing in the URL the access token
* and/or any other parameters the Facebook backend includes in
* the result (such as an error code if an error occurs).
*
* See http://developers.facebook.com/docs/authentication/ for more details.
*
* Also note that requests may be made to the API without calling
* authorize() first, in which case only public information is returned.
*
* @param permissions
* A list of permission required for this application: e.g.
* "read_stream", "publish_stream", or "offline_access". see
* http://developers.facebook.com/docs/authentication/permissions
* This parameter should not be null -- if you do not require any
* permissions, then pass in an empty String array.
* @param delegate
* Callback interface for notifying the calling application when
* the user has logged in.
*/
- (void)authorize:(NSArray *)permissions {
// if we already have a session, git rid of it
[self.session close];
self.session = nil;
[self.tokenCaching clearToken];
self.session = [[[FBSession alloc] initWithAppID:_appId
permissions:permissions
urlSchemeSuffix:_urlSchemeSuffix
tokenCacheStrategy:self.tokenCaching]
autorelease];
[self.session openWithCompletionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
switch (status) {
case FBSessionStateOpen:
// call the legacy session delegate
[self fbDialogLogin:session.accessToken expirationDate:session.expirationDate];
break;
case FBSessionStateClosedLoginFailed:
{ // prefer to keep decls near to their use
// unpack the error code and reason in order to compute cancel bool
NSString *errorCode = [[error userInfo] objectForKey:FBErrorLoginFailedOriginalErrorCode];
NSString *errorReason = [[error userInfo] objectForKey:FBErrorLoginFailedReason];
BOOL userDidCancel = !errorCode && (!errorReason ||
[errorReason isEqualToString:FBErrorLoginFailedReasonInlineCancelledValue]);
// call the legacy session delegate
[self fbDialogNotLogin:userDidCancel];
}
break;
// presently extension, log-out and invalidation are being implemented in the Facebook class
default:
break; // so we do nothing in response to those state transitions
}
}];
}
-(NSString*)accessToken {
return self.tokenCaching.accessToken;
}
-(void)setAccessToken:(NSString *)accessToken {
self.tokenCaching.accessToken = accessToken;
self.hasUpdatedAccessToken = YES;
}
-(NSDate*)expirationDate {
return self.tokenCaching.expirationDate;
self.hasUpdatedAccessToken = YES;
}
-(void)setExpirationDate:(NSDate *)expirationDate {
self.tokenCaching.expirationDate = expirationDate;
}
/**
* Attempt to extend the access token.
*
* Access tokens typically expire within 30-60 days. When the user uses the
* app, the app should periodically try to obtain a new access token. Once an
* access token has expired, the app can no longer renew it. The app then has
* to ask the user to re-authorize it to obtain a new access token.
*
* To ensure your app always has a fresh access token for active users, it's
* recommended that you call extendAccessTokenIfNeeded in your application's
* applicationDidBecomeActive: UIApplicationDelegate method.
*/
- (void)extendAccessToken {
if (_isExtendingAccessToken) {
return;
}
_isExtendingAccessToken = YES;
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
@"auth.extendSSOAccessToken", @"method",
nil];
[self requestWithParams:params andDelegate:self];
}
/**
* Calls extendAccessToken if shouldExtendAccessToken returns YES.
*/
- (void)extendAccessTokenIfNeeded {
if ([self shouldExtendAccessToken]) {
[self extendAccessToken];
}
}
/**
* Returns YES if the last time a new token was obtained was over 24 hours ago.
*/
- (BOOL)shouldExtendAccessToken {
if ([self isSessionValid]){
NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDateComponents *components = [calendar components:NSHourCalendarUnit
fromDate:_lastAccessTokenUpdate
toDate:[NSDate date]
options:0];
if (components.hour >= kTokenExtendThreshold) {
return YES;
}
}
return NO;
}
/**
* This function processes the URL the Facebook application or Safari used to
* open your application during a Facebook Login flow.
*
* You MUST call this function in your UIApplicationDelegate's handleOpenURL
* method (see
* http://developer.apple.com/library/ios/#documentation/uikit/reference/UIApplicationDelegate_Protocol/Reference/Reference.html
* for more info).
*
* This will ensure that the authorization process will proceed smoothly once the
* Facebook application or Safari redirects back to your application.
*
* @param URL the URL that was passed to the application delegate's handleOpenURL method.
*
* @return YES if the URL starts with 'fb[app_id]://authorize and hence was handled
* by SDK, NO otherwise.
*/
- (BOOL)handleOpenURL:(NSURL *)url {
return [self.session handleOpenURL:url];
}
/**
* Invalidate the current user session by removing the access token in
* memory and clearing the browser cookie.
*
* Note that this method dosen't unauthorize the application --
* it just removes the access token. To unauthorize the application,
* the user must remove the app in the app settings page under the privacy
* settings screen on facebook.com.
*/
- (void)logout {
[self invalidateSession];
if ([self.sessionDelegate respondsToSelector:@selector(fbDidLogout)]) {
[self.sessionDelegate fbDidLogout];
}
}
/**
* Invalidate the current user session by removing the access token in
* memory and clearing the browser cookie.
*
* @deprecated Use of a single session delegate, set at app init, is preferred
*/
- (void)logout:(id<FBSessionDelegate>)delegate {
[self logout];
// preserve deprecated callback behavior, but leave cached delegate intact
// avoid calling twice if the passed and cached delegates are the same
if (delegate != self.sessionDelegate &&
[delegate respondsToSelector:@selector(fbDidLogout)]) {
[delegate fbDidLogout];
}
}
/**
* Make a request to Facebook's REST API with the given
* parameters. One of the parameter keys must be "method" and its value
* should be a valid REST server API method.
*
* See http://developers.facebook.com/docs/reference/rest/
*
* @param parameters
* Key-value pairs of parameters to the request. Refer to the
* documentation: one of the parameters must be "method".
* @param delegate
* Callback interface for notifying the calling application when
* the request has received response
* @return FBRequest*
* Returns a pointer to the FBRequest object.
*/
- (FBRequest*)requestWithParams:(NSMutableDictionary *)params
andDelegate:(id <FBRequestDelegate>)delegate {
if ([params objectForKey:@"method"] == nil) {
NSLog(@"API Method must be specified");
return nil;
}
NSString * methodName = [params objectForKey:@"method"];
[params removeObjectForKey:@"method"];
return [self requestWithMethodName:methodName
andParams:params
andHttpMethod:@"GET"
andDelegate:delegate];
}
/**
* Make a request to Facebook's REST API with the given method name and
* parameters.
*
* See http://developers.facebook.com/docs/reference/rest/
*
*
* @param methodName
* a valid REST server API method.
* @param parameters
* Key-value pairs of parameters to the request. Refer to the
* documentation: one of the parameters must be "method". To upload
* a file, you should specify the httpMethod to be "POST" and the
* “params” you passed in should contain a value of the type
* (UIImage *) or (NSData *) which contains the content that you
* want to upload
* @param delegate
* Callback interface for notifying the calling application when
* the request has received response
* @return FBRequest*
* Returns a pointer to the FBRequest object.
*/
- (FBRequest*)requestWithMethodName:(NSString *)methodName
andParams:(NSMutableDictionary *)params
andHttpMethod:(NSString *)httpMethod
andDelegate:(id <FBRequestDelegate>)delegate {
[self updateSessionIfTokenUpdated];
[self extendAccessTokenIfNeeded];
FBRequest *request = [[FBRequest alloc] initWithSession:self.session
restMethod:methodName
parameters:params
HTTPMethod:httpMethod];
[request setDelegate:delegate];
[request startWithCompletionHandler:nil];
return request;
}
/**
* Make a request to the Facebook Graph API without any parameters.
*
* See http://developers.facebook.com/docs/api
*
* @param graphPath
* Path to resource in the Facebook graph, e.g., to fetch data
* about the currently logged authenticated user, provide "me",
* which will fetch http://graph.facebook.com/me
* @param delegate
* Callback interface for notifying the calling application when
* the request has received response
* @return FBRequest*
* Returns a pointer to the FBRequest object.
*/
- (FBRequest*)requestWithGraphPath:(NSString *)graphPath
andDelegate:(id <FBRequestDelegate>)delegate {
return [self requestWithGraphPath:graphPath
andParams:[NSMutableDictionary dictionary]
andHttpMethod:@"GET"
andDelegate:delegate];
}
/**
* Make a request to the Facebook Graph API with the given string
* parameters using an HTTP GET (default method).
*
* See http://developers.facebook.com/docs/api
*
*
* @param graphPath
* Path to resource in the Facebook graph, e.g., to fetch data
* about the currently logged authenticated user, provide "me",
* which will fetch http://graph.facebook.com/me
* @param parameters
* key-value string parameters, e.g. the path "search" with
* parameters "q" : "facebook" would produce a query for the
* following graph resource:
* https://graph.facebook.com/search?q=facebook
* @param delegate
* Callback interface for notifying the calling application when
* the request has received response
* @return FBRequest*
* Returns a pointer to the FBRequest object.
*/
- (FBRequest*)requestWithGraphPath:(NSString *)graphPath
andParams:(NSMutableDictionary *)params
andDelegate:(id <FBRequestDelegate>)delegate {
return [self requestWithGraphPath:graphPath
andParams:params
andHttpMethod:@"GET"
andDelegate:delegate];
}
/**
* Make a request to the Facebook Graph API with the given
* HTTP method and string parameters. Note that binary data parameters
* (e.g. pictures) are not yet supported by this helper function.
*
* See http://developers.facebook.com/docs/api
*
*
* @param graphPath
* Path to resource in the Facebook graph, e.g., to fetch data
* about the currently logged authenticated user, provide "me",
* which will fetch http://graph.facebook.com/me
* @param parameters
* key-value string parameters, e.g. the path "search" with
* parameters {"q" : "facebook"} would produce a query for the
* following graph resource:
* https://graph.facebook.com/search?q=facebook
* To upload a file, you should specify the httpMethod to be
* "POST" and the “params” you passed in should contain a value
* of the type (UIImage *) or (NSData *) which contains the
* content that you want to upload
* @param httpMethod
* http verb, e.g. "GET", "POST", "DELETE"
* @param delegate
* Callback interface for notifying the calling application when
* the request has received response
* @return FBRequest*
* Returns a pointer to the FBRequest object.
*/
- (FBRequest*)requestWithGraphPath:(NSString *)graphPath
andParams:(NSMutableDictionary *)params
andHttpMethod:(NSString *)httpMethod
andDelegate:(id <FBRequestDelegate>)delegate {
[self updateSessionIfTokenUpdated];
[self extendAccessTokenIfNeeded];
FBRequest *request = [[FBRequest alloc] initWithSession:self.session
graphPath:graphPath
parameters:params
HTTPMethod:httpMethod];
[request setDelegate:delegate];
[request startWithCompletionHandler:nil];
return request;
}
/**
* Generate a UI dialog for the request action.
*
* @param action
* String representation of the desired method: e.g. "login",
* "feed", ...
* @param delegate
* Callback interface to notify the calling application when the
* dialog has completed.
*/
- (void)dialog:(NSString *)action
andDelegate:(id<FBDialogDelegate>)delegate {
NSMutableDictionary * params = [NSMutableDictionary dictionary];
[self dialog:action andParams:params andDelegate:delegate];
}
/**
* Generate a UI dialog for the request action with the provided parameters.
*
* @param action
* String representation of the desired method: e.g. "login",
* "feed", ...
* @param parameters
* key-value string parameters
* @param delegate
* Callback interface to notify the calling application when the
* dialog has completed.
*/
- (void)dialog:(NSString *)action
andParams:(NSMutableDictionary *)params
andDelegate:(id <FBDialogDelegate>)delegate {
[_fbDialog release];
NSString *dialogURL = [kDialogBaseURL stringByAppendingString:action];
[params setObject:@"touch" forKey:@"display"];
[params setObject:kSDKVersion forKey:@"sdk"];
[params setObject:kRedirectURL forKey:@"redirect_uri"];
if ([action isEqualToString:kLogin]) {
[params setObject:@"user_agent" forKey:@"type"];
_fbDialog = [[FBLoginDialog alloc] initWithURL:dialogURL loginParams:params delegate:self];
} else {
[params setObject:_appId forKey:@"app_id"];
if ([self isSessionValid]) {
[params setValue:[self.accessToken stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]
forKey:@"access_token"];
[self extendAccessTokenIfNeeded];
}
// by default we show dialogs, frictionless cases may have a hidden view
BOOL invisible = NO;
// frictionless handling for application requests
if ([action isEqualToString:kApprequests]) {
// if frictionless requests are enabled
if (self.isFrictionlessRequestsEnabled) {
// 1. show the "Don't show this again for these friends" checkbox
// 2. if the developer is sending a targeted request, then skip the loading screen
[params setValue:@"1" forKey:@"frictionless"];
// 3. request the frictionless recipient list encoded in the success url
[params setValue:@"1" forKey:@"get_frictionless_recipients"];
}
// set invisible if all recipients are enabled for frictionless requests
id fbid = [params objectForKey:@"to"];
if (fbid != nil) {
// if value parses as a json array expression get the list that way
SBJsonParser *parser = [[[SBJsonParser alloc] init] autorelease];
id fbids = [parser objectWithString:fbid];
if (![fbids isKindOfClass:[NSArray class]]) {
// otherwise seperate by commas (handles the singleton case too)
fbids = [fbid componentsSeparatedByString:@","];
}
invisible = [self isFrictionlessEnabledForRecipients:fbids];
}
}
_fbDialog = [[FBDialog alloc] initWithURL:dialogURL
params:params
isViewInvisible:invisible
frictionlessSettings:_frictionlessRequestSettings
delegate:delegate];
}
[_fbDialog show];
}
- (BOOL)isFrictionlessRequestsEnabled {
return _frictionlessRequestSettings.enabled;
}
- (void)enableFrictionlessRequests {
[_frictionlessRequestSettings enableWithFacebook:self];
}
- (void)reloadFrictionlessRecipientCache {
[_frictionlessRequestSettings reloadRecipientCacheWithFacebook:self];
}
- (BOOL)isFrictionlessEnabledForRecipient:(NSString*)fbid {
return [_frictionlessRequestSettings isFrictionlessEnabledForRecipient:fbid];
}
- (BOOL)isFrictionlessEnabledForRecipients:(NSArray*)fbids {
return [_frictionlessRequestSettings isFrictionlessEnabledForRecipients:fbids];
}
/**
* @return boolean - whether this object has an non-expired session token
*/
- (BOOL)isSessionValid {
return (self.accessToken != nil && self.expirationDate != nil
&& NSOrderedDescending == [self.expirationDate compare:[NSDate date]]);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
//FBLoginDialogDelegate
/**
* Set the authToken and expirationDate after login succeed
*/
- (void)fbDialogLogin:(NSString *)token expirationDate:(NSDate *)expirationDate {
[_lastAccessTokenUpdate release];
_lastAccessTokenUpdate = [[NSDate date] retain];
[self reloadFrictionlessRecipientCache];
if ([self.sessionDelegate respondsToSelector:@selector(fbDidLogin)]) {
[self.sessionDelegate fbDidLogin];
}
}
/**
* Did not login call the not login delegate
*/
- (void)fbDialogNotLogin:(BOOL)cancelled {
if ([self.sessionDelegate respondsToSelector:@selector(fbDidNotLogin:)]) {
[self.sessionDelegate fbDidNotLogin:cancelled];
}
}
#pragma mark - FBRequestDelegate Methods
// These delegate methods are only called for requests that extendAccessToken initiated
- (void)request:(FBRequest *)request didFailWithError:(NSError *)error {
_isExtendingAccessToken = NO;
}
- (void)request:(FBRequest *)request didLoad:(id)result {
_isExtendingAccessToken = NO;
NSString* accessToken = [result objectForKey:@"access_token"];
NSString* expTime = [result objectForKey:@"expires_at"];
if (accessToken == nil || expTime == nil) {
return;
}
self.accessToken = accessToken;
NSTimeInterval timeInterval = [expTime doubleValue];
NSDate *expirationDate = [NSDate distantFuture];
if (timeInterval != 0) {
expirationDate = [NSDate dateWithTimeIntervalSince1970:timeInterval];
}
self.expirationDate = expirationDate;
[_lastAccessTokenUpdate release];
_lastAccessTokenUpdate = [[NSDate date] retain];
[self updateSessionIfTokenUpdated];
if ([self.sessionDelegate respondsToSelector:@selector(fbDidExtendToken:expiresAt:)]) {
[self.sessionDelegate fbDidExtendToken:accessToken expiresAt:expirationDate];
}
}
- (void)request:(FBRequest *)request didLoadRawResponse:(NSData *)data {
}
- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response{
}
- (void)requestLoading:(FBRequest *)request{
}
+ (BOOL)automaticallyNotifiesObserversForKey:(NSString *)key {
// these properties must manually notify for KVO
if ([key isEqualToString:FBaccessTokenPropertyName] ||
[key isEqualToString:FBexpirationDatePropertyName]) {
return NO;
} else {
return [super automaticallyNotifiesObserversForKey:key];
}
}
@end
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