1 files changed, 21 insertions, 1 deletions
diff --git a/src/objective-c/GRPCClient/private/NSDictionary+GRPC.m b/src/objective-c/GRPCClient/private/NSDictionary+GRPC.m
index e59685e4a8..c350f32f2a 100644
--- a/src/objective-c/GRPCClient/private/NSDictionary+GRPC.m
+++ b/src/objective-c/GRPCClient/private/NSDictionary+GRPC.m
@@ -33,7 +33,7 @@
 
 #import "NSDictionary+GRPC.h"
 
-#include <grpc.h>
+#include <grpc/support/alloc.h>
 
 @implementation NSDictionary (GRPC)
 + (instancetype)grpc_dictionaryFromMetadata:(grpc_metadata *)entries count:(size_t)count {
@@ -53,4 +53,24 @@
   }
   return metadata;
 }
+
+- (grpc_metadata *)grpc_metadataArray {
+  grpc_metadata *metadata = gpr_malloc([self count] * sizeof(grpc_metadata));
+  int i = 0;
+  for (id key in self) {
+    id value = self[key];
+    grpc_metadata *current = &metadata[i];
+    current->key = [key UTF8String];
+    if ([value isKindOfClass:[NSData class]]) {
+      current->value = [value bytes];
+    } else if ([value isKindOfClass:[NSString class]]) {
+      current->value = [value UTF8String];
+    } else {
+      [NSException raise:NSInvalidArgumentException
+                  format:@"Metadata values must be NSString or NSData."];
+    }
+    i += 1;
+  }
+  return metadata;
+}
 @end