user signature and more info

RNGameCenter/ios/RNGameCenter.m

@@ -124,19 +124,58 @@ - (dispatch_queue_t)methodQueue{
   }
 
   @try {
-    GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
-    NSDictionary* user = @{
-      @"alias":localPlayer.alias,
-      @"displayName":localPlayer.displayName,
-      @"playerID":localPlayer.playerID,
-      @"alias":localPlayer.alias
-      };
-    resolve(user);
+
+     [[GKLocalPlayer localPlayer] generateIdentityVerificationSignatureWithCompletionHandler:^(NSURL *publicKeyUrl, NSData *signature, NSData *salt, uint64_t timestamp, NSError *error) {
+          NSDictionary* user = @{
+                                 @"playerId":[GKLocalPlayer localPlayer].playerID,
+                                 @"alias":[GKLocalPlayer localPlayer].alias,
+                                 @"displayName":[GKLocalPlayer localPlayer].displayName,
+                                 @"publicKeyUrl":[publicKeyUrl absoluteString],
+                                 @"signature":[self base64forData:signature],
+                                 @"salt":[self base64forData:salt],
+                                 @"timestamp":@(timestamp),
+                                 @"bundleId": [[NSBundle mainBundle] bundleIdentifier]
+                                 };
+          resolve(user);
+      }];
+
   }@catch (NSError * e) {
     reject(@"Error",@"Error getting user.", e);
   }
 }
 
+- (NSString*)base64forData:(NSData*)theData {
+    const uint8_t* input = (const uint8_t*)[theData bytes];
+    NSInteger length = [theData length];
+
+    static char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+
+    NSMutableData* data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
+    uint8_t* output = (uint8_t*)data.mutableBytes;
+
+    NSInteger i;
+    for (i=0; i < length; i += 3) {
+        NSInteger value = 0;
+        NSInteger j;
+        for (j = i; j < (i + 3); j++) {
+            value <<= 8;
+
+            if (j < length) {
+                value |= (0xFF & input[j]);
+            }
+        }
+
+        NSInteger theIndex = (i / 3) * 4;
+        output[theIndex + 0] =                    table[(value >> 18) & 0x3F];
+        output[theIndex + 1] =                    table[(value >> 12) & 0x3F];
+        output[theIndex + 2] = (i + 1) < length ? table[(value >> 6)  & 0x3F] : '=';
+        output[theIndex + 3] = (i + 2) < length ? table[(value >> 0)  & 0x3F] : '=';
+    }
+
+    return [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
+}
+
+
 /* --------------loadLeaderboardPlayers--------------
 //let leaderboardIdentifier="high_scores"
 // let achievementIdentifier="pro_award"