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/*
* Copyright 2012 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 "FBFrictionlessRequestSettings.h"
///////////////////////////////////////////////////////////////////////////////////////////////////
// private interface
//
@interface FBFrictionlessRequestSettings () <FBRequestDelegate>
@property (readwrite, retain) NSArray * allowedRecipients;
@property (readwrite, retain) FBRequest* activeRequest;
@end
///////////////////////////////////////////////////////////////////////////////////////////////////
@implementation FBFrictionlessRequestSettings
///////////////////////////////////////////////////////////////////////////////////////////////////
// public
@synthesize enabled = _enabled;
- (id)init {
if (self = [super init]) {
// start life with an empty frictionless cache
self.allowedRecipients = [[[NSArray alloc] init] autorelease];
}
return self;
}
- (void)enableWithFacebook:(Facebook*)facebook {
if (!_enabled) {
_enabled = YES;
[self reloadRecipientCacheWithFacebook:facebook];
}
}
- (void)reloadRecipientCacheWithFacebook:(Facebook *)facebook {
// request the list of frictionless recipients from the server
id request = [facebook requestWithGraphPath:@"me/apprequestformerrecipients"
andDelegate:self];
if (request) {
self.activeRequest = request;
}
}
- (void)updateRecipientCacheWithRecipients:(NSArray*)ids {
// if setting recipients directly, no need to complete pending request
self.activeRequest = nil;
if (ids == nil) {
self.allowedRecipients = [[[NSArray alloc] init] autorelease];
} else {
self.allowedRecipients = [[[NSArray alloc] initWithArray:ids] autorelease];
}
}
- (BOOL)isFrictionlessEnabledForRecipient:(NSString *)fbid {
// trim whitespace from edges
fbid = [fbid stringByTrimmingCharactersInSet:
[NSCharacterSet whitespaceCharacterSet]];
// linear search through cache for a match
for (NSString *entry in self.allowedRecipients) {
if ([entry isEqualToString:fbid]) {
return YES;
}
}
return NO;
}
- (BOOL)isFrictionlessEnabledForRecipients:(NSArray*)fbids {
// we handle arrays of NSString and NSNumber, and throw on anything else
for (id fbid in fbids) {
NSString* fbidstr;
// give us a number, and we convert it to a string
if ([fbid isKindOfClass:[NSNumber class]]) {
fbidstr = [(NSNumber*)fbid stringValue];
} else if ([fbid isKindOfClass:[NSString class]]) {
// or give us a string, and we just use it as is
fbidstr = (NSString*)fbid;
} else {
// unexpected type found in the array of fbids
@throw [NSException exceptionWithName:NSInvalidArgumentException
reason:@"items in fbids must be NSString or NSNumber"
userInfo:[NSDictionary dictionaryWithObjectsAndKeys:
[fbid class], @"invalid class",
nil]];
}
// if we miss our cache once, we fail the set
if (![self isFrictionlessEnabledForRecipient:fbidstr]) {
return NO;
}
}
return YES;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
// FBRequestDelegate
- (void)request:(FBRequest *)request
didLoad:(id)result {
// a little request bookkeeping
self.activeRequest = nil;
int items = [[result objectForKey: @"data"] count];
NSMutableArray* recipients = [[[NSMutableArray alloc] initWithCapacity: items] autorelease];
for (int i = 0; i < items; i++) {
[recipients addObject: [[[result objectForKey: @"data"]
objectAtIndex: i]
objectForKey: @"recipient_id"]] ;
}
self.allowedRecipients = recipients;
}
- (void)request:(FBRequest *)request didFailWithError:(NSError *)error {
// if the request to load the frictionless recipients fails, proceed without updating
// the recipients cache; the cache may become invalid due to a failed update or other reasons
// (e.g. simultaneous use of the same app from multiple devices), in the case of an invalid
// cache, a request dialog may either appear a moment later than it usually would, or appear
// briefly when it should not appear at all; in either case the correct request behavior
// occurs, and the cache is updated
self.activeRequest = nil;
}
///////////////////////////////////////////////////////////////////////////////////////////////////
// NSObject
- (void)dealloc {
self.activeRequest = nil;
self.allowedRecipients = nil;
[super dealloc];
}
///////////////////////////////////////////////////////////////////////////////////////////////////
// private helpers
//
@synthesize allowedRecipients = _allowedRecipients;
@synthesize activeRequest = _activeRequest;
@end
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