- Saves user metadata in keychain. (#305)

- Adds Swift stubs for the new API.
- Shows the `isNewUser` bit in the sample app.

3 files changed, 14 insertions, 5 deletions

diff --git a/Firebase/Auth/Source/FIRUser.m b/Firebase/Auth/Source/FIRUser.m
index d24a2bf..049bb30 100644
--- a/Firebase/Auth/Source/FIRUser.m
+++ b/Firebase/Auth/Source/FIRUser.m
@@ -112,6 +112,11 @@ static NSString *const kAPIKeyCodingKey = @"APIKey";
  */
 static NSString *const kTokenServiceCodingKey = @"tokenService";
 
+/** @var kMetadataCodingKey
+    @brief The key used to encode the metadata instance variable for NSSecureCoding.
+ */
+static NSString *const kMetadataCodingKey = @"metadata";
+
 /** @var kMissingUsersErrorMessage
     @brief The error message when there is no users array in the getAccountInfo response.
  */
@@ -305,6 +310,8 @@ static void callInMainThreadWithAuthDataResultAndError(
       [aDecoder decodeObjectOfClasses:providerDataClasses forKey:kProviderDataKey];
   FIRSecureTokenService *tokenService =
       [aDecoder decodeObjectOfClass:[FIRSecureTokenService class] forKey:kTokenServiceCodingKey];
+  FIRUserMetadata *metadata =
+      [aDecoder decodeObjectOfClass:[FIRUserMetadata class] forKey:kMetadataCodingKey];
   if (!userID || !tokenService) {
     return nil;
   }
@@ -322,6 +329,7 @@ static void callInMainThreadWithAuthDataResultAndError(
     _photoURL = photoURL;
     _providerData = providerData;
     _phoneNumber = phoneNumber;
+    _metadata = metadata ?: [[FIRUserMetadata alloc] initWithCreationDate:nil lastSignInDate:nil];
   }
   return self;
 }
@@ -336,6 +344,7 @@ static void callInMainThreadWithAuthDataResultAndError(
   [aCoder encodeBool:_emailVerified forKey:kEmailVerifiedCodingKey];
   [aCoder encodeObject:_photoURL forKey:kPhotoURLCodingKey];
   [aCoder encodeObject:_displayName forKey:kDisplayNameCodingKey];
+  [aCoder encodeObject:_metadata forKey:kMetadataCodingKey];
   // The API key is encoded even it is not used in decoding to be compatible with previous versions
   // of the library.
   [aCoder encodeObject:_auth.requestConfiguration.APIKey forKey:kAPIKeyCodingKey];
diff --git a/Firebase/Auth/Source/FIRUserMetadata.m b/Firebase/Auth/Source/FIRUserMetadata.m
index 65ca15c..8fe6509 100644
--- a/Firebase/Auth/Source/FIRUserMetadata.m
+++ b/Firebase/Auth/Source/FIRUserMetadata.m
@@ -30,8 +30,8 @@ static NSString *const kCreationDateCodingKey = @"creationDate";
  */
 static NSString *const kLastSignInDateCodingKey = @"lastSignInDate";
 
-- (nullable instancetype)initWithCreationDate:(NSDate *)creationDate
-                               lastSignInDate:(NSDate *)lastSignInDate {
+- (instancetype)initWithCreationDate:(nullable NSDate *)creationDate
+                      lastSignInDate:(nullable NSDate *)lastSignInDate {
   self = [super init];
   if (self) {
     _creationDate = [creationDate copy];
diff --git a/Firebase/Auth/Source/FIRUserMetadata_Internal.h b/Firebase/Auth/Source/FIRUserMetadata_Internal.h
index 3fd1efc..0b01a03 100644
--- a/Firebase/Auth/Source/FIRUserMetadata_Internal.h
+++ b/Firebase/Auth/Source/FIRUserMetadata_Internal.h
@@ -25,13 +25,13 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @interface FIRUserMetadata () <NSSecureCoding>
 
-/** @fn initWithCreationDate
+/** @fn initWithCreationDate:lastSignInDate:
     @brief Designated initializer.
     @param creationDate The creation date of the corresponding user.
     @param lastSignInDate The date of the last recorded sign-in of the corresponding user.
  */
-- (nullable instancetype)initWithCreationDate:(NSDate *)creationDate
-                               lastSignInDate:(NSDate *)lastSignInDate NS_DESIGNATED_INITIALIZER;
+- (instancetype)initWithCreationDate:(nullable NSDate *)creationDate
+                      lastSignInDate:(nullable NSDate *)lastSignInDate NS_DESIGNATED_INITIALIZER;
 
 @end