keychain/ot/OTCuttlefishAccountStateHolder.m

   1
   2 #import "keychain/ot/OTCuttlefishAccountStateHolder.h"
   3
   4 #import "keychain/categories/NSError+UsefulConstructors.h"
   5 #import "keychain/ot/categories/OTAccountMetadataClassC+KeychainSupport.h"
   6 #import "keychain/ot/ObjCImprovements.h"
   7
   8 @interface OTCuttlefishAccountStateHolder ()
   9 @property dispatch_queue_t queue;
  10 @property dispatch_queue_t notifyQueue;
  11
  12 @property NSString* containerName;
  13 @property NSString* contextID;
  14
  15 @property NSMutableSet<id<OTCuttlefishAccountStateHolderNotifier>>* monitors;
  16 @end
  17
  18 @implementation OTCuttlefishAccountStateHolder
  19
  20 - (instancetype)initWithQueue:(dispatch_queue_t)queue
  21                     container:(NSString*)containerName
  22                       context:(NSString*)contextID
  23 {
  24     if((self = [super init])) {
  25         _queue = queue;
  26         _notifyQueue = dispatch_queue_create("OTCuttlefishAccountStateHolderNotifier", NULL);
  27         _containerName = containerName;
  28         _contextID = contextID;
  29         _monitors = [NSMutableSet set];
  30     }
  31     return self;
  32 }
  33
  34 - (void)registerNotification:(id<OTCuttlefishAccountStateHolderNotifier>)notifier
  35 {
  36     [self.monitors addObject:notifier];
  37 }
  38
  39 - (OTAccountMetadataClassC* _Nullable)loadOrCreateAccountMetadata:(NSError**)error
  40 {
  41     __block OTAccountMetadataClassC* metadata = nil;
  42     __block NSError* localError = nil;
  43     dispatch_sync(self.queue, ^{
  44         metadata = [self _onqueueLoadOrCreateAccountMetadata:&localError];
  45     });
  46
  47     if(error && localError) {
  48         *error = localError;
  49     }
  50     return metadata;
  51 }
  52
  53 - (OTAccountMetadataClassC* _Nullable)_onqueueLoadOrCreateAccountMetadata:(NSError**)error
  54 {
  55     dispatch_assert_queue(self.queue);
  56
  57     NSError* localError = nil;
  58     OTAccountMetadataClassC* current = [OTAccountMetadataClassC loadFromKeychainForContainer:self.containerName contextID:self.contextID error:&localError];
  59
  60     if(!current || localError) {
  61         if([localError.domain isEqualToString:NSOSStatusErrorDomain] && localError.code == errSecItemNotFound) {
  62             // That's okay, this is the first time we're saving this.
  63             current = [[OTAccountMetadataClassC alloc] init];
  64             current.attemptedJoin = OTAccountMetadataClassC_AttemptedAJoinState_NOTATTEMPTED;
  65         } else {
  66             // No good.
  67             if(error) {
  68                 *error = localError;
  69             }
  70             return nil;
  71         }
  72     }
  73
  74     return current;
  75 }
  76
  77 - (NSString * _Nullable)getEgoPeerID:(NSError * _Nullable *)error {
  78     NSError* localError = nil;
  79
  80     OTAccountMetadataClassC* current = [self loadOrCreateAccountMetadata:&localError];
  81
  82     if(localError || !current) {
  83         if(error) {
  84             *error = localError;
  85         }
  86         return nil;
  87     }
  88
  89     if(!current.peerID) {
  90         if(error) {
  91             *error = [NSError errorWithDomain:OTCuttlefishContextErrorDomain
  92                                          code:OTCCNoExistingPeerID
  93                                   description:@"No existing ego peer ID"];
  94         }
  95
  96         return nil;
  97     }
  98
  99     return current.peerID;
 100 }
 101
 102 - (OTAccountMetadataClassC_AttemptedAJoinState)fetchPersistedJoinAttempt:(NSError * _Nullable *)error {
 103     NSError* localError = nil;
 104     OTAccountMetadataClassC* current = [self loadOrCreateAccountMetadata:&localError];
 105
 106     if(localError || !current) {
 107         if(error) {
 108             *error = localError;
 109         }
 110         return OTAccountMetadataClassC_AttemptedAJoinState_UNKNOWN;
 111     }
 112     return current.attemptedJoin;
 113 }
 114
 115 - (NSDate *)lastHealthCheckupDate:(NSError * _Nullable *)error {
 116     NSError* localError = nil;
 117
 118     OTAccountMetadataClassC* current = [self loadOrCreateAccountMetadata:&localError];
 119
 120     if(localError || !current) {
 121         if(error) {
 122             *error = localError;
 123         }
 124         return NULL;
 125     }
 126
 127     return [NSDate dateWithTimeIntervalSince1970: ((NSTimeInterval)current.lastHealthCheckup) / 1000.0];
 128 }
 129
 130
 131 - (BOOL)persistNewEgoPeerID:(NSString*)peerID error:(NSError**)error {
 132     return [self persistAccountChanges:^OTAccountMetadataClassC * _Nonnull(OTAccountMetadataClassC * _Nonnull metadata) {
 133         metadata.peerID = peerID;
 134         return metadata;
 135     } error:error];
 136 }
 137
 138 - (BOOL)persistNewTrustState:(OTAccountMetadataClassC_TrustState)newState
 139                          error:(NSError**)error
 140 {
 141     return [self persistAccountChanges:^(OTAccountMetadataClassC *metadata) {
 142         metadata.trustState = newState;
 143         return metadata;
 144     } error:error];
 145 }
 146
 147 - (BOOL)persistNewAccountState:(OTAccountMetadataClassC_AccountState)newState
 148                optionalAltDSID:(NSString* _Nullable)altDSID
 149                          error:(NSError**)error
 150 {
 151     return [self persistAccountChanges:^(OTAccountMetadataClassC *metadata) {
 152         metadata.icloudAccountState = newState;
 153         metadata.altDSID = altDSID;
 154         return metadata;
 155     } error:error];
 156 }
 157
 158 - (BOOL)persistNewEpoch:(uint64_t)epoch
 159                   error:(NSError**)error
 160 {
 161     return [self persistAccountChanges:^(OTAccountMetadataClassC *metadata) {
 162         metadata.epoch = epoch;
 163         return metadata;
 164     } error:error];
 165 }
 166
 167 - (BOOL)persistAccountChanges:(OTAccountMetadataClassC* _Nullable (^)(OTAccountMetadataClassC*))makeChanges
 168                         error:(NSError**)error
 169 {
 170     __block NSError* localError = nil;
 171     __block OTAccountMetadataClassC* newState = nil;
 172     __block OTAccountMetadataClassC* oldState = nil;
 173
 174     dispatch_sync(self.queue, ^void {
 175         oldState = [self _onqueueLoadOrCreateAccountMetadata:&localError];
 176         if(!oldState) {
 177             return;
 178         }
 179
 180         newState = makeChanges([oldState copy]);
 181         if(newState && ![newState saveToKeychainForContainer:self.containerName contextID:self.contextID error:&localError]) {
 182             newState = nil;
 183         }
 184     });
 185
 186     if(localError && error) {
 187         *error = localError;
 188     }
 189
 190     if (newState) {
 191         [self asyncNotifyAccountStateChanges:newState from:oldState];
 192         return YES;
 193     } else {
 194         return NO;
 195     }
 196 }
 197
 198 - (BOOL)persistLastHealthCheck:(NSDate*)lastCheck
 199                          error:(NSError**)error
 200 {
 201     return [self persistAccountChanges:^(OTAccountMetadataClassC *metadata) {
 202         metadata.lastHealthCheckup = (uint64_t) ([lastCheck timeIntervalSince1970] * 1000);
 203         return metadata;
 204     } error:error];
 205 }
 206
 207 - (BOOL)persistOctagonJoinAttempt:(OTAccountMetadataClassC_AttemptedAJoinState)attempt
 208                             error:(NSError**)error
 209 {
 210     return [self persistAccountChanges:^(OTAccountMetadataClassC *metadata) {
 211         metadata.attemptedJoin = attempt;
 212         return metadata;
 213     } error:error];
 214 }
 215
 216 - (BOOL)_onqueuePersistAccountChanges:(OTAccountMetadataClassC* _Nullable (^)(OTAccountMetadataClassC* metadata))makeChanges
 217                                 error:(NSError**)error
 218 {
 219     __block NSError* localError = nil;
 220     dispatch_assert_queue(self.queue);
 221
 222     OTAccountMetadataClassC *oldState = nil;
 223     OTAccountMetadataClassC *newState = nil;
 224
 225     oldState = [self _onqueueLoadOrCreateAccountMetadata:&localError];
 226     if(oldState) {
 227         newState = makeChanges([oldState copy]);
 228
 229         if(![newState saveToKeychainForContainer:self.containerName contextID:self.contextID error:&localError]) {
 230             newState = nil;
 231         }
 232     }
 233
 234     if (error && localError) {
 235         *error = localError;
 236     }
 237
 238     if (newState) {
 239         [self asyncNotifyAccountStateChanges:newState from:oldState];
 240         return YES;
 241     } else {
 242         return NO;
 243     }
 244 }
 245
 246 - (void)asyncNotifyAccountStateChanges:(OTAccountMetadataClassC *)newState from:(OTAccountMetadataClassC *)oldState
 247 {
 248     WEAKIFY(self);
 249
 250     dispatch_async(self.notifyQueue, ^{
 251         STRONGIFY(self);
 252
 253         for (id<OTCuttlefishAccountStateHolderNotifier> monitor in self.monitors) {
 254             [monitor accountStateUpdated:newState from:oldState];
 255         }
 256     });
 257 }
 258
 259
 260 @end