Firebase Storage: Allowing metadata to be cleared (#197)

* Allowing metadata to be cleared

1 files changed, 20 insertions, 0 deletions

diff --git a/Firebase/Storage/Private/FIRStorageMetadata_Private.h b/Firebase/Storage/Private/FIRStorageMetadata_Private.h
index 629c935..ad8cc94 100644
--- a/Firebase/Storage/Private/FIRStorageMetadata_Private.h
+++ b/Firebase/Storage/Private/FIRStorageMetadata_Private.h
@@ -15,6 +15,7 @@
  */
 
 #import "FIRStorageConstants_Private.h"
+#import "FIRStorageMetadata.h"
 
 @class FIRStorageReference;
 
@@ -34,6 +35,25 @@ NS_ASSUME_NONNULL_BEGIN
 @property(readwrite) FIRStorageMetadataType type;
 
 /**
+ * The original metadata representation received from the server or an empty dictionary
+ * if the metadata object was initialized by the user.
+ */
+@property(copy, nonatomic) NSDictionary *initialMetadata;
+
+/**
+ * Recursively removes entries in 'metadata' that are unmodified from 'oldMetadata'.
+ * Adds 'NSNull' for entries that only exist in oldMetadata.
+ */
++ (void)removeMatchingMetadata:(NSMutableDictionary *)metadata
+                   oldMetadata:(NSDictionary *)oldMetadata;
+
+/**
+ * Computes the updates between the state at initialization and the current state.
+ * Returns a dictionary with only the updated data. Removed keys are set to NSNull.
+ */
+- (NSDictionary *)updatedMetadata;
+
+/**
  * Returns an RFC3339 formatted date from a string.
  * @param dateString An NSString of the form: yyyy-MM-ddTHH:mm:ss.SSSZ.
  * @return An NSDate populated from the string or nil if conversion isn't possible.