Add getDynamicLink method

Author: imzyy

packages/firebase_dynamic_links/ios/Classes/FirebaseDynamicLinksPlugin.m

@@ -99,6 +99,20 @@ - (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result
     } else {
       result(dict);
     }
+  } else if ([@"FirebaseDynamicLinks#getDynamicLink" isEqualToString:call.method]) {
+    NSURL *shortLink = [NSURL URLWithString:call.arguments[@"url"]];
+    FIRDynamicLinkUniversalLinkHandler completion = 
+        ^(FIRDynamicLink *_Nullable dynamicLink, NSError *_Nullable error) {
+          if (error) {
+            result(getFlutterError(error));
+          } else if (dynamicLink && dynamicLink.url) {
+            result(@{@"url" : [dynamicLink.url absoluteString]});
+          } else {
+            result(@{});
+          }
+        };
+    [[FIRDynamicLinks dynamicLinks] handleUniversalLink:shortLink
+                                             completion:completion];
   } else {
     result(FlutterMethodNotImplemented);
   }

packages/firebase_dynamic_links/lib/src/firebase_dynamic_links.dart

@@ -37,6 +37,16 @@ class FirebaseDynamicLinks {
     return getPendingDynamicLinkDataFromMap(linkData);
   }
 
+  Future<Uri> getDynamicLink(Uri url) async {
+    final Map<String, dynamic> reply = await FirebaseDynamicLinks.channel
+        .invokeMapMethod<String, dynamic>('FirebaseDynamicLinks#getDynamicLink',
+            <String, dynamic>{'url': url.toString()});
+    if (reply['url'] == null) {
+      return null;
+    }
+    return Uri.tryParse(reply['url']);
+  }
+
   PendingDynamicLinkData getPendingDynamicLinkDataFromMap(
       Map<dynamic, dynamic> linkData) {
     if (linkData == null) return null;