// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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//
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// You are hereby granted a non-exclusive, worldwide, royalty-free license to use,
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// copy, modify, and distribute this software in source code or binary form for use
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// in connection with the web services and APIs provided by Facebook.
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//
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// As with any software that integrates with the Facebook platform, your use of
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// this software is subject to the Facebook Developer Principles and Policies
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// [http://developers.facebook.com/policy/]. This copyright notice shall be
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// included in all copies or substantial portions of the software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#import <Foundation/Foundation.h>
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#import "FBSDKConstants.h"
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@class FBSDKGraphErrorRecoveryProcessor;
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@class FBSDKGraphRequest;
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/**
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Defines a delegate for `FBSDKGraphErrorRecoveryProcessor`.
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*/
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@protocol FBSDKGraphErrorRecoveryProcessorDelegate<NSObject>
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/**
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Indicates the error recovery has been attempted.
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@param processor the processor instance.
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@param didRecover YES if the recovery was successful.
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@param error the error that that was attempted to be recovered from.
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*/
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- (void)processorDidAttemptRecovery:(FBSDKGraphErrorRecoveryProcessor *)processor didRecover:(BOOL)didRecover error:(NSError *)error;
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@optional
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/**
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Indicates the processor is about to process the error.
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@param processor the processor instance.
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@param error the error is about to be processed.
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return NO if the processor should not process the error. For example,
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if you want to prevent alerts of localized messages but otherwise perform retries and recoveries,
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you could return NO for errors where userInfo[FBSDKGraphRequestErrorKey] equal to FBSDKGraphRequestErrorOther
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*/
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- (BOOL)processorWillProcessError:(FBSDKGraphErrorRecoveryProcessor *)processor error:(NSError *)error;
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@end
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/**
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Defines a type that can process Facebook NSErrors with best practices.
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Facebook NSErrors can contain FBSDKErrorRecoveryAttempting instances to recover from errors, or
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localized messages to present to the user. This class will process the instances as follows:
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1. If the error is temporary as indicated by FBSDKGraphRequestErrorKey, assume the recovery succeeded and
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notify the delegate.
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2. If a FBSDKErrorRecoveryAttempting instance is available, display an alert (dispatched to main thread)
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with the recovery options and call the instance's [ attemptRecoveryFromError:optionIndex:...].
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3. If a FBSDKErrorRecoveryAttempting is not available, check the userInfo for FBSDKLocalizedErrorDescriptionKey
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and present that in an alert (dispatched to main thread).
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By default, FBSDKGraphRequests use this type to process errors and retry the request upon a successful
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recovery.
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Note that Facebook recovery attempters can present UI or even cause app switches (such as to login). Any such
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work is dispatched to the main thread (therefore your request handlers may then run on the main thread).
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Login recovery requires FBSDKLoginKit. Login will use FBSDKLoginBehaviorNative and will prompt the user
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for all permissions last granted. If any are declined on the new request, the recovery is not successful but
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the `[FBSDKAccessToken currentAccessToken]` might still have been updated.
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.
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*/
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@interface FBSDKGraphErrorRecoveryProcessor : NSObject
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/**
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Gets the delegate. Note this is a strong reference, and is nil'ed out after recovery is complete.
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*/
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@property (nonatomic, strong, readonly) id<FBSDKGraphErrorRecoveryProcessorDelegate>delegate;
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/**
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Attempts to process the error, return YES if the error can be processed.
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@param error the error to process.
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@param request the related request that may be reissued.
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@param delegate the delegate that will be retained until recovery is complete.
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*/
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- (BOOL)processError:(NSError *)error request:(FBSDKGraphRequest *)request delegate:(id<FBSDKGraphErrorRecoveryProcessorDelegate>) delegate;
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/**
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The callback for FBSDKErrorRecoveryAttempting
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@param didRecover if the recovery succeeded
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@param contextInfo unused
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*/
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- (void)didPresentErrorWithRecovery:(BOOL)didRecover contextInfo:(void *)contextInfo;
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@end
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