/*
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* Copyright (C) 2017 Twitter, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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@class TWTRAuthConfig;
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@class TWTRGuestSession;
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@class TWTRSession;
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@protocol TWTRAuthSession;
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@protocol TWTRAPIServiceConfig;
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@protocol TWTRErrorLogger;
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NS_ASSUME_NONNULL_BEGIN
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#pragma mark - TWTRSessionRefreshingStore Protocol
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/**
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* Completion block called when a session refresh succeeds or fails.
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*
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* @param refreshedSession The refreshed session
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* @param error Error that will be non nil if the refresh request failed
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*/
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typedef void (^TWTRSessionStoreRefreshCompletion)(id _Nullable refreshedSession, NSError *_Nullable error);
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/**
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* Protocol for session stores that can refresh expired sessions.
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*/
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@protocol TWTRSessionRefreshingStore <NSObject>
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/**
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* Refresh an expired session.
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*
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* @param sessionClass The class of the session
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* @param sessionID ID of the session wherever applicable e.g. `userID` if it's a user session.
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* @param completion The completion block to call when the refresh request succeeds or fails.
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*/
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- (void)refreshSessionClass:(Class)sessionClass sessionID:(nullable NSString *)sessionID completion:(TWTRSessionStoreRefreshCompletion)completion;
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/**
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* Determines whether the given session has expired.
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*
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* @param session The session to check for expiration
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* @param response API request response to check for expiration
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*
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* @return Whether the session has expired.
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*/
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- (BOOL)isExpiredSession:(id)session response:(NSHTTPURLResponse *)response;
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/**
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* Determines whether the given session has expired based on a given error.
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*
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* @param session The session to check for expiration
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* @param error API request error to check for expiration
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*
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* @return Whether the session has expired.
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*/
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- (BOOL)isExpiredSession:(id)session error:(NSError *)error;
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@end
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#pragma mark - TWTRUserSessionStore Protocol
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/**
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* Completion block called when a user session saved to the session store or fails.
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*
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* @param session The saved session
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* @param error Error that will be non nil if the save request fails.
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*/
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typedef void (^TWTRSessionStoreSaveCompletion)(id<TWTRAuthSession> _Nullable session, NSError *_Nullable error);
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/**
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* Completion block called when fetching all stored user sessions completes or fails.
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*
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* @param sessions All stored user sessions or empty array if there are no user sessions found.
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*/
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typedef void (^TWTRSessionStoreBatchFetchCompletion)(NSArray *sessions);
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/**
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* Completion block to call when the session is deleted or fails.
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*
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* @param session The deleted session or nil if none was found for the user.
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*/
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typedef void (^TWTRSessionStoreDeleteCompletion)(id<TWTRAuthSession> _Nullable session);
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/**
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* Protocol for session store that manages user sessions.
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*/
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@protocol TWTRUserSessionStore <NSObject>
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/**
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* Saves the existing session to the store after validations.
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*
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* @param session The user session to save
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* @param completion Completion block to call when the save request succeeds or fails
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*/
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- (void)saveSession:(id<TWTRAuthSession>)session completion:(TWTRSessionStoreSaveCompletion)completion;
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/**
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* Fetches the user session for for the given auth tokens and saves it to the store after validations.
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*
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* @param authToken The existing authToken to use for authentication.
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* @param authTokenSecret The existing authTokenSecret to use for authentication.
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* @param completion Completion block to call when the save request succeeds or fails
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*/
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- (void)saveSessionWithAuthToken:(NSString *)authToken authTokenSecret:(NSString *)authTokenSecret completion:(TWTRSessionStoreSaveCompletion)completion;
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/**
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* Checks to see if the user is logged in and has a saved session.
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*
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* @param userID The user ID to fetch session for.
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*/
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- (nullable id<TWTRAuthSession>)sessionForUserID:(NSString *)userID;
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/**
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* Retrieve all logged in user sessions in ascending order of last saved date
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*
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* @note This is a blocking call.
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*/
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- (NSArray *)existingUserSessions;
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/**
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* Returns YES if there are existing user sessions.
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*
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* @note This is a blocking call.
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*/
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- (BOOL)hasLoggedInUsers;
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/**
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* Retrieves the last logged in user session.
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*
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* @return The last logged in user session.
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*/
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- (nullable id<TWTRAuthSession>)session;
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/**
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* Deletes the local Twitter user session from this app. This will not remove the system Twitter account nor make a network request to invalidate the session.
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*
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* @param userID ID of the user to log out
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*/
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- (void)logOutUserID:(NSString *)userID;
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@end
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#pragma mark - TWTRGuestSessionStore Protocol
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/**
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* Completion block called when retrieving a guest session succeeds or fails.
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*
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* @param guestSession The retrieved guest session
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* @param error Error that will be non nil if the save request fails.
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*/
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typedef void (^TWTRSessionGuestLogInCompletion)(TWTRGuestSession *_Nullable guestSession, NSError *_Nullable error);
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/**
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* Protocol for session stores that can manage guest sessions.
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*/
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@protocol TWTRGuestSessionStore <NSObject>
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/**
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* Log in as a guest user and return the guest session. This can be used when the user is not a Twitter user.
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*
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* @param completion Completion block to call when the authentication succeeds or fails.
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*
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* @warning This method assumes your application, as indicated by the `consumerKey` and `consumerSecret` in the `authConfig`, has been whitelisted for guest authentication.
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*/
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- (void)fetchGuestSessionWithCompletion:(TWTRSessionGuestLogInCompletion)completion;
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@end
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#pragma mark - Composite TWTRSessionStore Protocol
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/**
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* Convenience composite protocol of a store that handles user, guest, and refreshable sessions.
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*/
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@protocol TWTRSessionStore <TWTRUserSessionStore, TWTRGuestSessionStore, TWTRSessionRefreshingStore>
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/**
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* Returns the store's auth config.
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*/
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@property (nonatomic, readonly) TWTRAuthConfig *authConfig;
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@end
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#pragma mark - Concrete Session Store Class
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/**
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* Concrete implementation of <TWTRSessionStore>. This session store supports fetching and storage of
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* user and guest sessions. In addition, the session store also supports refreshing of such sessions when they expire.
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*
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* @warning Instances of the session manager at the same path are not synchronized. The session store
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* will simply choose the latest version in the case of conflicts.
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*/
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@interface TWTRSessionStore : NSObject <TWTRSessionStore>
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- (instancetype)init NS_UNAVAILABLE;
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/**
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* Provides a mechanism for reloading the session store. This method will force the session store
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* to find any sessions that may have been saved by another session store or application that is
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* using the same keychain access groups.
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*
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* Most applications will not need to call this method. You may need to call this method if you are
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* using multiple stores within your application and you need to synchronize when one writes to the
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* store. The more likely case for needing to call this method is if you are sharing credentials
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* between applications. In this situation you will want to call this method when the application
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* comes back to the foreground.
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*
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* This method does not need to be called when the store is created because this process happens
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* by default at time of instantiation.
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*
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* You should avoid calling this method if you do not have a specific reason to do so, like the reasons
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* mentioned above as this method does cause disk I/O and multiple calls can cause performance problems.
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*/
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- (void)reloadSessionStore;
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@end
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NS_ASSUME_NONNULL_END
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