| commit | author | age | ||
| 655e66 | 1 | /* |
| H | 2 | * Copyright (C) 2017 Twitter, Inc. |
| 3 | * | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 | * you may not use this file except in compliance with the License. | |
| 6 | * You may obtain a copy of the License at | |
| 7 | * | |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 | * | |
| 10 | * Unless required by applicable law or agreed to in writing, software | |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 | * See the License for the specific language governing permissions and | |
| 14 | * limitations under the License. | |
| 15 | * | |
| 16 | */ | |
| a0a843 | 17 | |
| H | 18 | @class TWTRAuthConfig; |
| 19 | @class TWTRGuestSession; | |
| 20 | @class TWTRSession; | |
| 21 | @protocol TWTRAuthSession; | |
| 22 | @protocol TWTRAPIServiceConfig; | |
| 23 | @protocol TWTRErrorLogger; | |
| 24 | ||
| 25 | NS_ASSUME_NONNULL_BEGIN | |
| 26 | ||
| 27 | #pragma mark - TWTRSessionRefreshingStore Protocol | |
| 28 | ||
| 29 | /** | |
| 30 | * Completion block called when a session refresh succeeds or fails. | |
| 31 | * | |
| 32 | * @param refreshedSession The refreshed session | |
| 33 | * @param error Error that will be non nil if the refresh request failed | |
| 34 | */ | |
| 35 | typedef void (^TWTRSessionStoreRefreshCompletion)(id _Nullable refreshedSession, NSError *_Nullable error); | |
| 36 | ||
| 37 | /** | |
| 38 | * Protocol for session stores that can refresh expired sessions. | |
| 39 | */ | |
| 40 | @protocol TWTRSessionRefreshingStore <NSObject> | |
| 41 | ||
| 42 | /** | |
| 43 | * Refresh an expired session. | |
| 44 | * | |
| 45 | * @param sessionClass The class of the session | |
| 46 | * @param sessionID ID of the session wherever applicable e.g. `userID` if it's a user session. | |
| 47 | * @param completion The completion block to call when the refresh request succeeds or fails. | |
| 48 | */ | |
| 49 | - (void)refreshSessionClass:(Class)sessionClass sessionID:(nullable NSString *)sessionID completion:(TWTRSessionStoreRefreshCompletion)completion; | |
| 50 | ||
| 51 | /** | |
| 52 | * Determines whether the given session has expired. | |
| 53 | * | |
| 54 | * @param session The session to check for expiration | |
| 55 | * @param response API request response to check for expiration | |
| 56 | * | |
| 57 | * @return Whether the session has expired. | |
| 58 | */ | |
| 59 | - (BOOL)isExpiredSession:(id)session response:(NSHTTPURLResponse *)response; | |
| 60 | ||
| 61 | /** | |
| 62 | * Determines whether the given session has expired based on a given error. | |
| 63 | * | |
| 64 | * @param session The session to check for expiration | |
| 65 | * @param error API request error to check for expiration | |
| 66 | * | |
| 67 | * @return Whether the session has expired. | |
| 68 | */ | |
| 69 | - (BOOL)isExpiredSession:(id)session error:(NSError *)error; | |
| 70 | ||
| 71 | @end | |
| 72 | ||
| 73 | #pragma mark - TWTRUserSessionStore Protocol | |
| 74 | ||
| 75 | /** | |
| 76 | * Completion block called when a user session saved to the session store or fails. | |
| 77 | * | |
| 78 | * @param session The saved session | |
| 79 | * @param error Error that will be non nil if the save request fails. | |
| 80 | */ | |
| 81 | typedef void (^TWTRSessionStoreSaveCompletion)(id<TWTRAuthSession> _Nullable session, NSError *_Nullable error); | |
| 82 | ||
| 83 | /** | |
| 84 | * Completion block called when fetching all stored user sessions completes or fails. | |
| 85 | * | |
| 86 | * @param sessions All stored user sessions or empty array if there are no user sessions found. | |
| 87 | */ | |
| 88 | typedef void (^TWTRSessionStoreBatchFetchCompletion)(NSArray *sessions); | |
| 89 | ||
| 90 | /** | |
| 91 | * Completion block to call when the session is deleted or fails. | |
| 92 | * | |
| 93 | * @param session The deleted session or nil if none was found for the user. | |
| 94 | */ | |
| 95 | typedef void (^TWTRSessionStoreDeleteCompletion)(id<TWTRAuthSession> _Nullable session); | |
| 96 | ||
| 97 | /** | |
| 98 | * Protocol for session store that manages user sessions. | |
| 99 | */ | |
| 100 | @protocol TWTRUserSessionStore <NSObject> | |
| 101 | ||
| 102 | /** | |
| 103 | * Saves the existing session to the store after validations. | |
| 104 | * | |
| 105 | * @param session The user session to save | |
| 106 | * @param completion Completion block to call when the save request succeeds or fails | |
| 107 | */ | |
| 108 | - (void)saveSession:(id<TWTRAuthSession>)session completion:(TWTRSessionStoreSaveCompletion)completion; | |
| 109 | ||
| 110 | /** | |
| 111 | * Fetches the user session for for the given auth tokens and saves it to the store after validations. | |
| 112 | * | |
| 113 | * @param authToken The existing authToken to use for authentication. | |
| 114 | * @param authTokenSecret The existing authTokenSecret to use for authentication. | |
| 115 | * @param completion Completion block to call when the save request succeeds or fails | |
| 116 | */ | |
| 117 | - (void)saveSessionWithAuthToken:(NSString *)authToken authTokenSecret:(NSString *)authTokenSecret completion:(TWTRSessionStoreSaveCompletion)completion; | |
| 118 | ||
| 119 | /** | |
| 120 | * Checks to see if the user is logged in and has a saved session. | |
| 121 | * | |
| 122 | * @param userID The user ID to fetch session for. | |
| 123 | */ | |
| 124 | - (nullable id<TWTRAuthSession>)sessionForUserID:(NSString *)userID; | |
| 125 | ||
| 126 | /** | |
| 127 | * Retrieve all logged in user sessions in ascending order of last saved date | |
| 128 | * | |
| 129 | * @note This is a blocking call. | |
| 130 | */ | |
| 131 | - (NSArray *)existingUserSessions; | |
| 132 | ||
| 655e66 | 133 | /** |
| H | 134 | * Returns YES if there are existing user sessions. |
| 135 | * | |
| 136 | * @note This is a blocking call. | |
| 137 | */ | |
| a0a843 | 138 | - (BOOL)hasLoggedInUsers; |
| H | 139 | |
| 140 | /** | |
| 141 | * Retrieves the last logged in user session. | |
| 142 | * | |
| 143 | * @return The last logged in user session. | |
| 144 | */ | |
| 145 | - (nullable id<TWTRAuthSession>)session; | |
| 146 | ||
| 147 | /** | |
| 148 | * 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. | |
| 149 | * | |
| 150 | * @param userID ID of the user to log out | |
| 151 | */ | |
| 152 | - (void)logOutUserID:(NSString *)userID; | |
| 153 | ||
| 154 | @end | |
| 155 | ||
| 156 | #pragma mark - TWTRGuestSessionStore Protocol | |
| 157 | ||
| 158 | /** | |
| 159 | * Completion block called when retrieving a guest session succeeds or fails. | |
| 160 | * | |
| 161 | * @param guestSession The retrieved guest session | |
| 162 | * @param error Error that will be non nil if the save request fails. | |
| 163 | */ | |
| 164 | typedef void (^TWTRSessionGuestLogInCompletion)(TWTRGuestSession *_Nullable guestSession, NSError *_Nullable error); | |
| 165 | ||
| 166 | /** | |
| 167 | * Protocol for session stores that can manage guest sessions. | |
| 168 | */ | |
| 169 | @protocol TWTRGuestSessionStore <NSObject> | |
| 170 | ||
| 171 | /** | |
| 172 | * Log in as a guest user and return the guest session. This can be used when the user is not a Twitter user. | |
| 173 | * | |
| 174 | * @param completion Completion block to call when the authentication succeeds or fails. | |
| 175 | * | |
| 176 | * @warning This method assumes your application, as indicated by the `consumerKey` and `consumerSecret` in the `authConfig`, has been whitelisted for guest authentication. | |
| 177 | */ | |
| 178 | - (void)fetchGuestSessionWithCompletion:(TWTRSessionGuestLogInCompletion)completion; | |
| 179 | ||
| 180 | @end | |
| 181 | ||
| 182 | #pragma mark - Composite TWTRSessionStore Protocol | |
| 183 | ||
| 184 | /** | |
| 185 | * Convenience composite protocol of a store that handles user, guest, and refreshable sessions. | |
| 186 | */ | |
| 187 | @protocol TWTRSessionStore <TWTRUserSessionStore, TWTRGuestSessionStore, TWTRSessionRefreshingStore> | |
| 188 | ||
| 189 | /** | |
| 190 | * Returns the store's auth config. | |
| 191 | */ | |
| 192 | @property (nonatomic, readonly) TWTRAuthConfig *authConfig; | |
| 193 | ||
| 194 | @end | |
| 195 | ||
| 196 | #pragma mark - Concrete Session Store Class | |
| 197 | ||
| 198 | /** | |
| 199 | * Concrete implementation of <TWTRSessionStore>. This session store supports fetching and storage of | |
| 200 | * user and guest sessions. In addition, the session store also supports refreshing of such sessions when they expire. | |
| 201 | * | |
| 202 | * @warning Instances of the session manager at the same path are not synchronized. The session store | |
| 203 | * will simply choose the latest version in the case of conflicts. | |
| 204 | */ | |
| 205 | @interface TWTRSessionStore : NSObject <TWTRSessionStore> | |
| 206 | ||
| 207 | - (instancetype)init NS_UNAVAILABLE; | |
| 208 | ||
| 209 | /** | |
| 210 | * Provides a mechanism for reloading the session store. This method will force the session store | |
| 211 | * to find any sessions that may have been saved by another session store or application that is | |
| 212 | * using the same keychain access groups. | |
| 213 | * | |
| 214 | * Most applications will not need to call this method. You may need to call this method if you are | |
| 215 | * using multiple stores within your application and you need to synchronize when one writes to the | |
| 216 | * store. The more likely case for needing to call this method is if you are sharing credentials | |
| 217 | * between applications. In this situation you will want to call this method when the application | |
| 218 | * comes back to the foreground. | |
| 219 | * | |
| 220 | * This method does not need to be called when the store is created because this process happens | |
| 221 | * by default at time of instantiation. | |
| 222 | * | |
| 223 | * You should avoid calling this method if you do not have a specific reason to do so, like the reasons | |
| 224 | * mentioned above as this method does cause disk I/O and multiple calls can cause performance problems. | |
| 225 | */ | |
| 226 | - (void)reloadSessionStore; | |
| 227 | ||
| 228 | @end | |
| 229 | ||
| 230 | NS_ASSUME_NONNULL_END | |
