Support NSSecureCoding for auth credentials

Example/Auth/Sample/MainViewController.m

@@ -2310,11 +2310,11 @@ - (void)getUserTokenResultWithForce:(BOOL)force {
 }
 
 /** @fn getAppTokenWithForce:
-    @brief Gets the token from @c FIRApp , optionally a refreshed one.
+    @brief Gets the token from @c FIRAuth , optionally a refreshed one.
     @param force Whether the refresh is forced or not.
  */
 - (void)getAppTokenWithForce:(BOOL)force {
-  [[FIRApp defaultApp] getTokenForcingRefresh:force withCallback:[self tokenCallback]];
+  [[FIRAuth auth] getTokenForcingRefresh:force withCallback:[self tokenCallback]];
 }
 
 /** @fn setDisplayName

Firebase/Auth/Source/AuthProviders/EmailPassword/FIREmailPasswordAuthCredential.h

@@ -23,7 +23,7 @@ NS_ASSUME_NONNULL_BEGIN
 /** @class FIREmailPasswordAuthCredential
     @brief Internal implementation of FIRAuthCredential for Email/Password credentials.
  */
-@interface FIREmailPasswordAuthCredential : FIRAuthCredential
+@interface FIREmailPasswordAuthCredential : FIRAuthCredential <NSSecureCoding>
 
 /** @property email
     @brief The user's email address.

Firebase/Auth/Source/AuthProviders/EmailPassword/FIREmailPasswordAuthCredential.m

@@ -57,4 +57,30 @@ - (void)prepareVerifyAssertionRequest:(FIRVerifyAssertionRequest *)request {
       @"Attempt to call prepareVerifyAssertionRequest: on a FIREmailPasswordAuthCredential."];
 }
 
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+  return YES;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
+  NSString *email = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"email"];
+  NSString *password = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"password"];
+  NSString *link = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"link"];
+  if (email.length && password.length) {
+    self = [self initWithEmail:email password:password];
+  } else if (email.length && link.length) {
+    self = [self initWithEmail:email link:link];
+  } else {
+    self = nil;
+  }
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+  [aCoder encodeObject:self.email forKey:@"email"];
+  [aCoder encodeObject:self.password forKey:@"password"];
+  [aCoder encodeObject:self.link forKey:@"link"];
+}
+
 @end

Firebase/Auth/Source/AuthProviders/Facebook/FIRFacebookAuthCredential.h

@@ -23,7 +23,7 @@ NS_ASSUME_NONNULL_BEGIN
 /** @class FIRFacebookAuthCredential
     @brief Internal implementation of FIRAuthCredential for the Facebook IdP.
  */
-@interface FIRFacebookAuthCredential : FIRAuthCredential
+@interface FIRFacebookAuthCredential : FIRAuthCredential <NSSecureCoding>
 
 /** @fn initWithAccessToken:
     @brief Designated initializer.

Firebase/Auth/Source/AuthProviders/Facebook/FIRFacebookAuthCredential.m

@@ -48,4 +48,20 @@ - (void)prepareVerifyAssertionRequest:(FIRVerifyAssertionRequest *)request {
   request.providerAccessToken = _accessToken;
 }
 
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+  return YES;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
+  NSString *accessToken = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"accessToken"];
+  self = [self initWithAccessToken:accessToken];
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+  [aCoder encodeObject:_accessToken forKey:@"accessToken"];
+}
+
 @end

Firebase/Auth/Source/AuthProviders/GameCenter/FIRGameCenterAuthCredential.h

@@ -23,7 +23,7 @@ NS_ASSUME_NONNULL_BEGIN
 /** @class FIRGameCenterAuthCredential
     @brief Internal implementation of FIRAuthCredential for Game Center credentials.
  */
-@interface FIRGameCenterAuthCredential : FIRAuthCredential
+@interface FIRGameCenterAuthCredential : FIRAuthCredential <NSSecureCoding>
 
 /** @property playerID
     @brief The ID of the Game Center local player.

Firebase/Auth/Source/AuthProviders/GameCenter/FIRGameCenterAuthCredential.m

@@ -52,4 +52,35 @@ - (void)prepareVerifyAssertionRequest:(FIRVerifyAssertionRequest *)request {
       @"Attempt to call prepareVerifyAssertionRequest: on a FIRGameCenterAuthCredential."];
 }
 
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+  return YES;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
+  NSString *playerID = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"playerID"];
+  NSURL *publicKeyURL = [aDecoder decodeObjectOfClass:[NSURL class] forKey:@"publicKeyURL"];
+  NSData *signature = [aDecoder decodeObjectOfClass:[NSData class] forKey:@"signature"];
+  NSData *salt = [aDecoder decodeObjectOfClass:[NSData class] forKey:@"salt"];
+  NSNumber *timestamp = [aDecoder decodeObjectOfClass:[NSNumber class] forKey:@"timestamp"];
+  NSString *displayName = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"displayName"];
+  self = [self initWithPlayerID:playerID
+                   publicKeyURL:publicKeyURL
+                      signature:signature
+                           salt:salt
+                      timestamp:timestamp.unsignedLongLongValue
+                    displayName:displayName];
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+  [aCoder encodeObject:self.playerID forKey:@"playerID"];
+  [aCoder encodeObject:self.publicKeyURL forKey:@"publicKeyURL"];
+  [aCoder encodeObject:self.signature forKey:@"signature"];
+  [aCoder encodeObject:self.salt forKey:@"salt"];
+  [aCoder encodeObject:[NSNumber numberWithUnsignedLongLong:self.timestamp] forKey:@"timestamp"];
+  [aCoder encodeObject:self.displayName forKey:@"displayName"];
+}
+
 @end

Firebase/Auth/Source/AuthProviders/GitHub/FIRGitHubAuthCredential.h

@@ -23,7 +23,7 @@ NS_ASSUME_NONNULL_BEGIN
 /** @class FIRGitHubAuthCredential
     @brief Internal implementation of FIRAuthCredential for GitHub credentials.
  */
-@interface FIRGitHubAuthCredential : FIRAuthCredential
+@interface FIRGitHubAuthCredential : FIRAuthCredential <NSSecureCoding>
 
 /** @property token
     @brief The GitHub OAuth access token.

Firebase/Auth/Source/AuthProviders/GitHub/FIRGitHubAuthCredential.m

@@ -46,4 +46,20 @@ - (void)prepareVerifyAssertionRequest:(FIRVerifyAssertionRequest *)request {
   request.providerAccessToken = _token;
 }
 
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+  return YES;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
+  NSString *token = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"token"];
+  self = [self initWithToken:token];
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+  [aCoder encodeObject:self.token forKey:@"token"];
+}
+
 @end

Firebase/Auth/Source/AuthProviders/Google/FIRGoogleAuthCredential.h

@@ -23,7 +23,7 @@ NS_ASSUME_NONNULL_BEGIN
 /** @class FIRGoogleAuthCredential
     @brief Internal implementation of FIRAuthCredential for the Google IdP.
  */
-@interface FIRGoogleAuthCredential : FIRAuthCredential
+@interface FIRGoogleAuthCredential : FIRAuthCredential <NSSecureCoding>
 
 /** @fn initWithIDToken:accessToken:
     @brief Designated initializer.

Firebase/Auth/Source/AuthProviders/Google/FIRGoogleAuthCredential.m

@@ -51,4 +51,22 @@ - (void)prepareVerifyAssertionRequest:(FIRVerifyAssertionRequest *)request {
   request.providerAccessToken = _accessToken;
 }
 
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+  return YES;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
+  NSString *IDToken = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"IDToken"];
+  NSString *accessToken = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"accessToken"];
+  self = [self initWithIDToken:IDToken accessToken:accessToken];
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+  [aCoder encodeObject:_IDToken forKey:@"IDToken"];
+  [aCoder encodeObject:_accessToken forKey:@"accessToken"];
+}
+
 @end

Firebase/Auth/Source/AuthProviders/OAuth/FIROAuthCredential.h

@@ -23,7 +23,7 @@ NS_ASSUME_NONNULL_BEGIN
 /** @class FIROAuthCredential
     @brief Internal implementation of FIRAuthCredential for generic credentials.
  */
-@interface FIROAuthCredential : FIRAuthCredential
+@interface FIROAuthCredential : FIRAuthCredential <NSSecureCoding>
 
 /** @property IDToken
     @brief The ID Token associated with this credential.

Firebase/Auth/Source/AuthProviders/OAuth/FIROAuthCredential.m

@@ -44,6 +44,24 @@ - (void)prepareVerifyAssertionRequest:(FIRVerifyAssertionRequest *)request {
   request.providerAccessToken = _accessToken;
 }
 
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+  return YES;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
+  NSString *IDToken = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"IDToken"];
+  NSString *accessToken = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"accessToken"];
+  self = [self initWithProviderID:self.provider IDToken:IDToken accessToken:accessToken];
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+  [aCoder encodeObject:self.IDToken forKey:@"IDToken"];
+  [aCoder encodeObject:self.accessToken forKey:@"accessToken"];
+}
+
 NS_ASSUME_NONNULL_END
 
 @end

Firebase/Auth/Source/AuthProviders/Phone/FIRPhoneAuthCredential.m

@@ -59,6 +59,34 @@ - (instancetype)initWithProviderID:(NSString *)providerID
   return self;
 }
 
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+  return YES;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
+  NSString *verificationID = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"verificationID"];
+  NSString *verificationCode = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"verificationCode"];
+  NSString *temporaryProof = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"temporaryProof"];
+  NSString *phoneNumber = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"phoneNumber"];
+  if (temporaryProof.length && phoneNumber.length) {
+    self = [self initWithTemporaryProof:temporaryProof phoneNumber:phoneNumber providerID:self.provider];
+  } else if (verificationID.length && verificationCode.length) {
+    self = [self initWithProviderID:self.provider verificationID:verificationID verificationCode:verificationCode];
+  } else {
+    self = nil;
+  }
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+  [aCoder encodeObject:self.verificationID forKey:@"verificationID"];
+  [aCoder encodeObject:self.verificationCode forKey:@"verificationCode"];
+  [aCoder encodeObject:self.temporaryProof forKey:@"temporaryProof"];
+  [aCoder encodeObject:self.phoneNumber forKey:@"phoneNumber"];
+}
+
 @end
 
 NS_ASSUME_NONNULL_END

Firebase/Auth/Source/AuthProviders/Twitter/FIRTwitterAuthCredential.h

@@ -23,7 +23,7 @@ NS_ASSUME_NONNULL_BEGIN
 /** @class FIRTwitterAuthCredential
     @brief Internal implementation of FIRAuthCredential for Twitter credentials.
  */
-@interface FIRTwitterAuthCredential : FIRAuthCredential
+@interface FIRTwitterAuthCredential : FIRAuthCredential <NSSecureCoding>
 
 /** @property token
     @brief The Twitter OAuth token.

Firebase/Auth/Source/AuthProviders/Twitter/FIRTwitterAuthCredential.m

@@ -48,4 +48,22 @@ - (void)prepareVerifyAssertionRequest:(FIRVerifyAssertionRequest *)request {
   request.providerOAuthTokenSecret = _secret;
 }
 
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+  return YES;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
+  NSString *token = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"token"];
+  NSString *secret = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"secret"];
+  self = [self initWithToken:token secret:secret];
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+  [aCoder encodeObject:self.token forKey:@"token"];
+  [aCoder encodeObject:self.secret forKey:@"secret"];
+}
+
 @end

Firebase/Auth/Source/FIRAuthCredential.m

@@ -21,7 +21,7 @@ @implementation FIRAuthCredential
 - (instancetype)init {
   @throw [NSException exceptionWithName:@"Attempt to call unavailable initializer."
                                  reason:@"This class is an abstract base class. It's init method "
-                                        "should not be called directly."
+          "should not be called directly."
                                userInfo:nil];
 }
 

Firebase/Auth/Source/Public/FIRPhoneAuthCredential.h

@@ -24,7 +24,7 @@ NS_ASSUME_NONNULL_BEGIN
     @brief Implementation of FIRAuthCredential for Phone Auth credentials.
  */
 NS_SWIFT_NAME(PhoneAuthCredential)
-@interface FIRPhoneAuthCredential : FIRAuthCredential
+@interface FIRPhoneAuthCredential : FIRAuthCredential <NSSecureCoding>
 
 /** @fn init
     @brief This class is not supposed to be instantiated directly.